GRB091127A

This page lists all entries on GRB091127A in GRBweb

Summary Fermi GBM IPN Swift GCN 10191 GCN 10192 GCN 10193 GCN 10194 GCN 10195 GCN 10196 GCN 10197 GCN 10198 GCN 10199 GCN 10200 GCN 10201 GCN 10202 GCN 10203 GCN 10204 GCN 10205 GCN 10206 GCN 10207 GCN 10208 GCN 10209 GCN 10211 GCN 10219 GCN 10224 GCN 10230 GCN 10233 GCN 10238 GCN 10244 GCN 10245 GCN 10248 GCN 10249 GCN 10400

Summary table
Variable Value Source
GRB_name_Fermi GRB091127976
T0 23:25:45 UTC GCN_circulars,Swift Det
ra 36.5829° Swift
decl -18.9524° Swift
pos_error 7.12e-05° Swift
T90 8.701 s Fermi_GBM
T90_error 0.571 s Fermi_GBM
T90_start 23:25:45.486 UTC Fermi_GBM
fluence 2.07e-05 erg/cm² Fermi_GBM
fluence_error 3.70e-08 erg/cm² Fermi_GBM
redshift 0.4900 GCN_circulars,Swift Other
T100 9.187 s
GBM_located False
mjd 55162.97621527778 GCN_circulars,Swift Det
Fermi GBM table
GRB_name_Fermi GRB091127976
trigger_name bn091127976
ra 36.5829°
decl -18.9525°
pos_error 2.52e+00°
datum 2009-11-27
t_trigger 23:25:45.483 UTC
T90 8.701 s
T90_error 0.571 s
T90_start 23:25:45.486 UTC
fluence 2.07e-05 erg/cm²
fluence_error 3.70e-08 erg/cm²
flux_1024 6.82e+01 erg/cm²/s
flux_1024_error 4.68e-01 erg/cm²/s
flux_1024_time 2.56e-01 erg/cm²/s
flux_64 1.03e+02 erg/cm²/s
flux_64_error 2.21e+00 erg/cm²/s
IPN table
GRB_name GRB091127A
ra 36.5708°
decl -18.9500°
pos_error 5.00e-02°
redshift 0.4900
Swift table
GRB_name GRB091127A
t_trigger 23:25:45 UTC
ra 36.5829°
decl -18.9524°
pos_error 7.12e-05°
T90 7.1 s
fluence 9.00e-06 erg/cm²
redshift 0.4900
GCN 10191 table
GRB_name GRB091127A
GCN_number 10191
Detection_method Swift Det
t_trigger 23:25:45 UTC
ra 36.5710°
decl -18.9540°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10191 SUBJECT: GRB 091127: Swift detection of a burst DATE: 09/11/27 23:36:19 GMT FROM: David Palmer at LANL E. Troja (NASA/GSFC/ORAU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), J. Mao (INAF-OAB), F. E. Marshall (NASA/GSFC), J. P. Osborne (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), J. L. Racusin (NASA/GSFC), A. Rowlinson (U Leicester) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift Team: At 23:25:45 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 091127 (trigger=377179). Swift did not immediately slew to the burst due to Earth limb constraint. The BAT on-board calculated location is RA, Dec 36.571, -18.954 which is RA(J2000) = 02h 26m 17s Dec(J2000) = -18d 57' 12" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 10 sec. The peak count rate was ~30,000 counts/sec (15-350 keV), at ~1 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+50 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is E. Troja (eleonora.troja AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN 10192 table
GRB_name GRB091127A
GCN_number 10192
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10192 SUBJECT: GRB 091127: Liverpool Telescope afterglow candidate DATE: 09/11/28 00:38:22 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy R.J. Smith, S. Kobayashi (Liverpool JMU), C. Guidorzi (U. Ferrara), C.G. Mundell (Liverpool JMU) on behalf of a larger collaboration report: "The 2-m Liverpool Telescope robotically followed up GRB 091127 (Swift trigger 377179; Troja et al. GCN 10191) 2.35 min after the GRB trigger time. The automatic "detection mode" procedure detected an uncatalogued fading afterglow candidate at: 02:26:19.89 , -18:57:08.60 (J2000) uncertainty 0.5" with magnitude of about R = 15.0 (vs USNOB1) Observations and analysis are ongoing.
GCN 10193 table
GRB_name GRB091127A
GCN_number 10193
Detection_method Swift-UVOT Det
ra 36.5829°
decl -18.9524°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10193 SUBJECT: GRB 091127: Swift/UVOT Detection of an Optical Afterglow DATE: 09/11/28 00:55:41 GMT FROM: Stefan Immler at NASA/GSFC GRB 091127: Swift/UVOT Detection of an Optical Afterglow S. Immler (CRESST/UMCP/GSFC) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift UVOT Team: UVOT took a finding chart exposure of 150 seconds with the White filter starting 3219 seconds after the BAT trigger. There is an afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 02:26:19.89 = 36.58288 DEC(J2000) = -18:57:08.5 = -18.95235 with a 90%-confidence error radius of about 0.61 arc sec. This position is 40.9 arc sec. from the center of the BAT error circle. The estimated magnitude is 16.21 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.04. The optical afterglow position is consistent with the Liverpool Telescope afterglow candidate (Smith et. al GCN 10192) that was detected with a magnitude of around R=15.0.
GCN 10194 table
GRB_name GRB091127A
GCN_number 10194
Detection_method Optical
ra 36.5825°
decl -18.9523°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10194 SUBJECT: GRB 091127: REM NIR afterglow detection DATE: 09/11/28 02:08:52 GMT FROM: Angelo Antonelli at Obs. Astro. di Roma D. Fugazza, L.A. Antonelli, S. Covino, P. D'Avanzo, S. Campana, G. Chincarini, V. D'Elia, F. D'Alessio, F. Fiore, P. Goldoni, C. Guidorzi, E. Maiorano, L. Nicastro, E. Palazzi, E. Pian, S. Piranomonte, L. Stella, G. Tagliaferri, G. Tosti, V. Testa, S.D. Vergani, F. Vitali report on behalf of the REM team: "The robotic 60-cm REM telescope located at La Silla (Chile) observed automatically the field of the GRB 091127 (Troja et al. GCN 10191) on Nov 27 starting observations about 90 min after the GRB. We clearly detect a NIR source at RA(J2000)=02:26:19.8, Dec.(J2000)=-18:57:08.3 with an uncertainty of 1" which is compatible with the position of the optical afterglow observed for this burst (Smith et al., GCN 10192; Immler & Troja, GCN 10193). The source was detected in all NIR filters and showed at the observation time a magnitude H= 12.6+/-0.15 and J=13.1+/-0.23, calibrated against 2MASS. Further analysis is in progress. This message may be citeted." ------------------------------------------------- This mail sent through IMP: http://horde.org/imp/
GCN 10195 table
GRB_name GRB091127A
GCN_number 10195
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 10195 SUBJECT: GRB 091127 : GROND observations DATE: 09/11/28 02:17:35 GMT FROM: Andrea Rossi at TLS Tautenburg Adria Updike (Clemson University), Andrea Rossi (Tautenburg Obs.), Arne Rau, Jochen Greiner, Paulo Afonso and Abdullah Yoldas (all MPE Garching) report on behalf of the GROND team: We observed the field of GRB 091127 (Swift trigger 377179; Trojo et al., GCN #10191) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m ESO/MPI telescope at La Silla Observatory (Chile). Observations started at 00:24 UT on Nov 28, 58 min after the GRB trigger, and are continuing. For the afterglow candidate reported by Smith et al. (GCN #10192) we estimate the following preliminary magnitudes (in the AB system): g = 16.63 +- 0.15 r = 16.53 +- 0.15 i = 16.42 +- 0.15 z = 16.35 +- 0.15 J = 16.40 +- 0.10 H = 16.36 +- 0.14 K analysis on going Given the smal g-r color, these values are in agreement with a afterglow at redshift z<3.5. A second epoch, at 01:33 UT, 2h and 8 min after the burst shows the afterglow is faded to r= 16.96+-0.15 (AB system). Given magnitudes are calibrated against GROND zeropoints as well as 2MASS field stars. The errors take in account zero point uncertainties. Magnitudes are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.038 mag in the direction of the burst (Schlegel et al. 1998).
GCN 10196 table
GRB_name GRB091127A
GCN_number 10196
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10196 SUBJECT: GRB 091127: NOT observations DATE: 09/11/28 03:09:15 GMT FROM: Dong Xu at DARK,NBI D. Xu (WIS,DARK/NBI), D. Malesani, J. Hjorth (DARK/NBI), A.A. Djupvik, J. Datson (NOT), P. Jakobsson (Univ. of Iceland), A. Carmona, C. Baldovin-Saavedra (ISDC & Geneva Observatory) report on behalf of a larger collaboration: We observed the field of GRB091127 (Troja et al., GCN 10191) with the Nordic Optical Telescope equipped with StanCam and NOTCam, starting at 00:36:03 UT on Nov. 28th, 70.3 mins after the burst. Preliminary data analysis confirms the bright optical afterglow (Smith et al., GCN 10192; Immler et al., GCN 10193) and shows R~16.3 at 00:38 UT I~16.2 at 01:09 UT R~16.5 at 01:15 UT J~15.9 at 01:43 UT H~15.4 at 01:34 UT K~14.8 at 01:26 UT. The R-band afterglow light curve is decaying slowly during our observations.
GCN 10197 table
GRB_name GRB091127A
GCN_number 10197
Detection_method Swift-BAT Det
ra 36.5810°
decl -18.9480°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10197 SUBJECT: GRB 091127: Swift-BAT refined analysis DATE: 09/11/28 03:23:46 GMT FROM: Scott Barthelmy at NASA/GSFC M. Stamatikos (GSFC/ORAU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), E. Troja (NASA/GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 091127 (trigger #377179) (Troja, et al., GCN Circ. 10191). The BAT ground-calculated position is RA, Dec = 36.581, -18.948 deg, which is RA(J2000) = 02h 26m 19.5s Dec(J2000) = -18d 56' 51.1" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 4%. The mask-weighted light curve shows three main peaks. The first starts at ~T-0.3 sec and peaks at ~T0. The second peaks at ~T+1.1 sec. The third peaks at ~T+7 sec and ends at ~T+10 sec. T90 (15-350 keV) is 7.1 +- 0.2 sec (estimated error including systematics). The time-averaged spectrum from T-0.4 to T+7.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.05 +- 0.07. The fluence in the 15-150 keV band is 9.0 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.25 sec in the 15-150 keV band is 46.5 +- 2.7 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/377179/BA/
GCN 10198 table
GRB_name GRB091127A
GCN_number 10198
Detection_method Optical
ra 36.5878°
decl -18.9553°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10198 SUBJECT: GRB 091127: CAHA 1.23m I-band observations DATE: 09/11/28 03:25:55 GMT FROM: Javier Gorosabel at IAA-CSIC J. Gorosabel (IAA-CSIC), A. de Ugarte Postigo (INAF/OAB), V. Terron (IAA-CSIC), M. Fernandez (IAA-CSIC), P. Kubanek (IAA-CSIC), M. Jelinek (IAA-CSIC), report on behalf of a larger collaboration: "We have detected the GRB 091127 optical afterglow (Smith et al. GCNC 10192; Immler et al. GCN 10193) by means of a single I-band frame (Texp=120s) taken with the CAHA 1.23m Telescope. The observations, carried out on Nov. 28.03862-28.04000 UT (~1.5 hours post burst) under poor weather conditions, yielded a preliminary I-band magnitude of I~16.4, assuming I=13.62 for the USNO-B1.0 star located at (RA,DEC) = (02:26:21.063,-18:57:19.02; J2000)."
GCN 10199 table
GRB_name GRB091127A
GCN_number 10199
Detection_method Swift-UVOT Det
ra 36.5829°
decl -18.9524°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10199 SUBJECT: GRB 091127: Swift/UVOT observations DATE: 09/11/28 05:17:52 GMT FROM: Stefan Immler at NASA/GSFC S. Immler (CRESST/UMCP/GSFC) and Troja (NASA/GSFC/ORAU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 091127 3219 s after the BAT trigger (Troja et al., GCN Circ. 10191). We detect the optical afterglow at the refined UVOT position RA, Dec 36.58288, -18.95239, which is RA (J2000) 02:26:19.89 Dec (J2000) -18:57:08.63 with an estimated uncertainty of 0.55 arcsec (radius, 90% confidence). This position is consistent with ground-based optical/IR detections of the afterglows (Smith et al., GCN 10192; Fugazza et al., GCN 10194; Updike et al., GCN 10195; Xu et al., GCN 10196; Gorosabel et al., GCN 10198). Preliminary magnitudes are reported below. Filter T_start(s) T_stop(s) Exposure(s) Mag Err ------------------------------------------------------------------------ white 3219 3369 147.4 16.2 +/- 0.1 v 3375 3575 196.6 17.0 +/- 0.1 uvw1 3785 5600 156.1 15.9 +/- 0.1 uvm2 3580 3780 196.6 15.6 +/- 0.1 ------------------------------------------------------------------------- The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.04 in the direction of the burst (Schlegel et al. 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383, 627).
GCN 10200 table
GRB_name GRB091127A
GCN_number 10200
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10200 SUBJECT: GRB 091127: TAROT La Silla observatory optical decay DATE: 09/11/28 08:22:39 GMT FROM: Alain Klotz at CESR-CNRS Klotz A. (CESR-OMP), Gendre B. (IASF), Boer M. (OHP-OAMP), Atteia J.L. (LATT-OMP) report: We imaged the field of GRB 091127 detected by Swift (trigger 377179) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile. The observations started 1 hour after the GRB trigger (event occured during dusk). The elevation of the field increased from 58 degrees above horizon and weather conditions were good. We detected the optical couterpart (OT) mentioned by Smith et al. 2009 (GCNC 10192). As the OT is bright, we used only R filtered images. We used the reference star at coordinates 02:26:15.06 -18:54:57.3 R=15.82, (V-R)=0.24 which is the closest star with (V-R) close to that of the GRB (V-R~0.1 according to GROND observations by Updike et al. GCNC 10195). The star at coodinates 02:26:21.07 -18:57:18.9 R=14.02 lies at 20 arcsec of the OT. We substract this star before photometry: ----------------------------------- Tstart Tstop Rmag (min) (min) ----------------------------------- 69.12 - 82.19 16.4 +/- 0.2 106.59 - 119.67 16.7 +/- 0.3 144.33 - 157.41 16.7 +/- 0.3 182.09 - 222.83 17.0 +/- 0.2 229.91 - 346.22 17.1 +/- 0.2 367.71 - 444.61 17.4 +/- 0.2 ----------------------------------- The decay is very low since the OT decreased of only 1 mag in 5 hours !
GCN 10201 table
GRB_name GRB091127A
GCN_number 10201
Detection_method Swift-XRT Other
ra 36.5829°
decl -18.9525°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10201 SUBJECT: GRB 091127: Swift-XRT afterglow detection and analysis DATE: 09/11/28 08:50:28 GMT FROM: Phil Evans at U of Leicester P.A. Evans, K.L. Page (U. Leicester) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift-XRT team: We have analysed 2.4 ks of XRT data for GRB 091127 (Troja et al. GCN Circ. 10191), from 3.2 ks to 15.8 ks after the BAT trigger. The data comprise 761 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. Using 1066 s of PC mode data and 4 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 36.58290, -18.95250 which is equivalent to: RA (J2000): 02 26 19.89 Dec(J2000): -18 57 08.9 with an uncertainty of 1.4 arcsec (radius, 90% confidence). This is consistent with the optical/UV/IR position reported in GCN Circs 10192-4. The light curve can be modelled with a power-law decay with a decay index of alpha=1.09 (+/-0.05). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.97 (+/-0.08). The best-fitting absorption column is 7.9 (+1.7, -1.6) x 10^20 cm^-2, in excess of the Galactic value of 2.8 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.98 (+0.15, -0.14) and a best-fitting absorption column of 9.8 (+3.3, -3.1) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.9 x 10^-11 (4.9 x 10^-11) erg cm^-2 count^-1. If the light curve continues to decay with a power-law decay index of 1.09, the count rate at T+24 hours will be 0.24 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 9.3 x 10^-12 (1.2 x 10^-11) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00377179. This circular is an official product of the Swift-XRT team.
GCN 10202 table
GRB_name GRB091127A
GCN_number 10202
Detection_method Swift Other
redshift 0.4900
Circular_text TITLE: GCN CIRCULAR NUMBER: 10202 SUBJECT: GRB 091127: Gemini-N redshift DATE: 09/11/28 11:27:46 GMT FROM: Antonino Cucchiara at PSU A. Cucchiara, D. Fox (PSU), A. Levan (Warwick U.) and N. Tanvir (U. Leicester) report: On November 28.40 UT we observed the afterglow of the Swift GRB 091127 (Troja et al. GCN 10191; Smith et al. GCN 10192) with the GMOS-N spectrograph on Gemini North. The observation consists of 2 exposures of 900 seconds each with the R400 grating, covering 4000-8000A wavelength range. The spectra shows a bright featureless continuum and two emission lines which we identified as [OIII]4959 and 5007 respectively at the common redshift of z = 0.490. Therefore we suggest this as redshift for GRB 091127. We thank the Gemini-N support staff, in particular A. Stephens, for performing these observations.
GCN 10203 table
GRB_name GRB091127A
GCN_number 10203
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10203 SUBJECT: GRB 091127: MASTER early optical transient polarimetry DATE: 09/11/28 16:31:40 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs A.Belinski, E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, N.Shatskiy, N.Tyurina, P.Balanutsa, V.V.Chazov, D. Zemnukhov, A.Kuznetsov Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parkhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalognikh, T.Kopytova, A. Popov Ural State University, Kourovka S.Yazev, K.Ivanov, N.M.Budnev, E.Konstantinov, V.Lenok Irkutsk State University V.Yurkov Blagoveschensk Educational State University, Blagoveschensk MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru, D= 2x400 mm, FOV= 2x4 square degrees, 2x16 Mpx Apogee CCD) located at Kislovodsk (2000m) was responted to the GRB 091027 (Troja et al., GCN 10191) 9 sec after Notice time and 91 s after the GRB time at very large zenit distance (~4 degrees up to horizont). We saw bright optical counterpart (~14 mag, 91-111 sec after GRB Time) at Liverpool position (Smith et al., GCN 10192) in both polarizations. We took ~20 images with synchronous exposition in two polarizations before GRB setting with growing exposition from 20 to 160 sec. We saw possible brightening around 2 min (after GRB Time). The reduction is continued. The message may be cited. mailto: lipunov@sai.msu.ru
GCN 10204 table
GRB_name GRB091127A
GCN_number 10204
Detection_method Fermi GBM Det
t_trigger 23:25:45.480 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 10204 SUBJECT: GRB 091127: Fermi GBM detection DATE: 09/11/28 22:01:05 GMT FROM: Colleen A. Wilson at NASA/MSFC/NSSTC Colleen A. Wilson-Hodge (NASA/MSFC) and Robert D. Preece (UAH) report on behalf of the Fermi GBM Team: "At 23:25:45.48 UT on 27 November 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 091127 (trigger 281057147 / 091127976), which was also detected by the SWIFT-BAT (Troja et al. 2009, GCN 10191) The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 25 degrees. The GBM light curve consists of three peaks with a duration (T90) of about 9 s (8-1000 keV). The time-averaged spectrum from T0+0.002 s to T0+9.984 s is adequately fit by a Band function with Epeak = 36 +/- 2 keV, alpha = -1.27 +/- 0.06, and beta = -2.20 +/- 0.02 (chi squared 645.8 for 445 d.o.f.). The event fluence (8-1000 keV) in this time interval is (1.87 +/- 0.02)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1 s in the 8-1000 keV band is 46.9 +/- 0.9 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 10205 table
GRB_name GRB091127A
GCN_number 10205
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10205 SUBJECT: GRB 091127: Further NOT optical observations DATE: 09/11/28 23:09:07 GMT FROM: Dong Xu at DARK,NBI D. Xu (WIS, DARK/NBI), D. Malesani, J. Hjorth (DARK/NBI), P. Jakobsson (Univ. of Iceland), A. Carmona, C. Baldovin-Saavedra (ISDC & Geneva Observatory) report on behalf of a larger collaboration: We continued to observe the field of GRB091127 (Troja et al., GCN 10191; Smith et al., GCN 10192; Immler et al., GCN 10193) at the Nordic Optical Telescope equipped with StanCam. Among a series of observations, a 60 s R-band frame was obtained staring at 21:51:50 UT on Nov. 28th, 22.4347 hr after the burst trigger. The optical afterglow is clearly detected in the frame. The magnitude is R=18.95+/-0.04, calibrated with the reference star #0710-0025176 (R2=14.02) in the USNO B1 catalog. Comparison with our previous observation (Xu et al., GCN 10196) indicates a decay slope of ~0.8 between the two epochs.
GCN 10206 table
GRB_name GRB091127A
GCN_number 10206
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10206 SUBJECT: GRB 091127: LABOCA/APEX submm observations DATE: 09/11/28 23:19:44 GMT FROM: Antonio Deugarte at IAA-CSIC A. de Ugarte Postigo (INAF-OAB), A. Lundgren, C. de Breuck, F. Montenegro and C. Agurto (ESO), J. Gorosabel, M. Jelinek, A.J. Castro-Tirado, P. Kubanek (IAA-CSIC), S. Covino, C.C. Thoene (INAF-OAB) report on behalf of a larger collaboration: "We have observed the field of GRB 091127 (Troja et al., GCN 10191) using LABOCA/APEX from Chajnantor (Chile) at 870 um. The observations began at 02:54 UT of the 28th Nov (3.48 hours after the burst) and lasted for ~3 hours. Sky conditions were mediocre, with PWV~1.5mm and tau~0.26. The image has an r.m.s. of 4.5mJy. In the preliminary analysis there is no source detected at the position of the optical afterglow (Smith et al. GCN 10192). Further observations are foreseen. This message may be quoted."
GCN 10207 table
GRB_name GRB091127A
GCN_number 10207
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10207 SUBJECT: GRB 091127: optical observations DATE: 09/11/29 12:56:34 GMT FROM: Alexei Pozanenko at IKI, Moscow M. Andreev, A. Sergeev (Terskol Branch of Institute of Astronomy), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report: We observed the optical afterglow (Smith et al. GCN 10192) of the Swift GRB 091127 (Troja et al. GCN 10191) with the Z-600 telescope of Mt.Terskol observatory in R-filter on Nov 28. In a combined images we clearly detect the afterglow. The photometry is based on the reference star used in GCN 10205 (the star #0710-0025176 of the USNO B1 catalog, assuming R2=14.02): T0+ Filter, Exposure, mag. (d) (s) 0.7981 R 10x180 18.60 +/- 0.10 0.9141 R 10x180 18.90 +/- 0.15 The photometry confirms the a global decay slope of ~0.8 within the first day after burst (Xu et al. GCN 10205).
GCN 10208 table
GRB_name GRB091127A
GCN_number 10208
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10208 SUBJECT: GRB 091127: TAROT La Silla observatory optical observations DATE: 09/11/29 16:48:23 GMT FROM: Alain Klotz at CESR-CNRS Klotz A. (CESR-OMP), Gendre B. (IASF), Boer M. (OHP-OAMP), Atteia J.L. (LATT-OMP) report: We imaged the field of GRB 091127 detected by Swift (trigger 377179) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile. We performed images between 1.12 and 1.37 day after the trigger using a R filter. We do not see the OT after co-addition of all images. The limiting magnitude is R=20.0.
GCN 10209 table
GRB_name GRB091127A
GCN_number 10209
Detection_method Konus-Wind Det
t_trigger 23:25:49.449 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 10209 SUBJECT: Konus-Wind observation of GRB 091127 DATE: 09/11/30 12:11:49 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report: The long GRB 091127 (Swift-BAT trigger #377179: Troja et al., GCN 10191; Stamatikos et al., 10197) triggered Konus-Wind at T0=84349.449 s UT (23:25:49.449). The burst light curve consists of two main peaks, and a third, softer peak. A total duration of the burst ~10 s. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB091127_T84349/ As observed by Konus-Wind the burst had a fluence of 1.22(+/-0.06)x10-5 erg/cm2, and a 64-ms peak flux measured from T0 + 0.256s of 8.3(+/-0.1)x10-6 erg/cm2/s (both in the 20 keV - 2 MeV energy range). The time-integrated spectrum of the burst (from T0 to T0+8.448 s) is well fitted in the 20 keV - 2 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), with alpha = -1.95(-0.1, +0.1), and Ep = 21.3(-3, +4) keV (chi2 = 57/58 dof). The spectrum of the most intense peak (measured from T0 to T0+0.256 s) is also well fitted in the 20 keV - 2 MeV range by a power law with exponential cutoff model, for which alpha = -1.6(-0.2, +0.2), and Ep = 130(-32, +41) keV (chi2 = 16/27 dof). Assuming z = 0.49 (Cucchiara et al., GCN 10202) and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.27, Omega_Lambda = 0.73, the isotropic energy release E_iso ~7.7x10^51 erg, the peak luminosity (L_iso)_max ~7.8x10^51 erg/s. All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.
GCN 10211 table
GRB_name GRB091127A
GCN_number 10211
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10211 SUBJECT: GRB 091127: Radio observations DATE: 09/11/30 15:07:22 GMT FROM: Dale A. Frail at NRAO Dale A. Frail (NRAO) and Poonam Chandra (RMC) report on behalf of a larger collaboration: "We used the Very Large Array (VLA) to observe the field of view towards the Swift burst GRB 091127 (GCN 10197, 10199, 10201) at a frequency of 8.46 GHz. Data was taken at two epochs: November 29.22 and November 30.21 UT. No radio source was detected at the position of the optical afterglow with typical 3-sigma upper limits of 300 uJy. A bright double-radio source in the field makes deeper observations difficult. No further observations are planned. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN 10219 table
GRB_name GRB091127A
GCN_number 10219
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 10219 SUBJECT: GRB 091127: Skynet/PROMPT Observations of Fading DATE: 09/12/01 03:28:42 GMT FROM: Josh Haislip at U.North Carolina J. Haislip, D. Reichart, K. Ivarsen, A. LaCluyze, L. Cominsky, K. McLin, T. Graves, G. Spear, R. Egger, A. Foster, J. Moore, A. Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M. Nysewander report: Skynet observed the Swift/BAT localization of GRB 091018 (Troja et al., GCN 10191) with five of the 16" PROMPT telescopes at CTIO beginning 61.6 minutes after the trigger in BVRI. Skynet continued observing with the 14" GORT telescope at Hume Observatory in California beginning 27.8 hours after the trigger in RI. We detect the afterglow (Smith et al., GCN 10192) in all filters. Similar to GRB 091018 (LaCluyze et al., GCN 10046), the afterglow faded more slowly in the red bands than in the blue bands over the course of the first night. Between 1 and 4 hours after the trigger, the afterglow faded with a power-law index of about -0.4 in I and about -0.5 in B. Between 4 and 9 hours after the trigger, the afterglow faded with a power-law index of about -0.9 in I and about -1.1 in B. Overall, I - B brightened by about 0.25 mag over the course of 8 hours. Between 9 and 33 hours after the trigger, the afterglow faded with a power-law index of about -1.2 in all bands. At 32.2 hours after the trigger, the afterglow's magnitude was R = 19.39 +/- 0.06 (statistical) +/- 0.37 (systematic; calibrated to 102 USNO B1 stars). Skynet's most recent BVRI light curve, calibrated to USNO B1 and NOMAD stars, can be found here: http://skynet.unc.edu/grb/grb091127.png
GCN 10224 table
GRB_name GRB091127A
GCN_number 10224
Detection_method Suzaku WAM Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 10224 SUBJECT: GRB 091127: Suzaku WAM observation of the prompt emission DATE: 09/12/01 13:01:32 GMT FROM: Yusuke Nishioka at Miyazaki U. Y. Nishioka, H. Hayashi, N. Ohmori, A. Daikyuji,E. Sonoda, K. Kono, K. Noda, M. Yamauchi (Univ. of Miyazaki), T. Sugasahara, M. Tashiro, Y. Terada, A. Endo, K. Onda, W. Iwakiri (Saitama U.), S. Sugita(Nagoya U.), K. Yamaoka (Aoyama Gakuin U.), M. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. E. Nakagawa, T. Tamagawa (RIKEN), N. Ohmori, A. Daikyuji, E. Sonoda, K. Kono, H. Hayashi, K. Noda, Y. Nishioka, M. Yamauchi (Univ. of Miyazaki), N. Vasquez (Tokyo Tech.), Y. Urata, H.M Lin (NCU), Y. Hanabata, T. Uehara, T. Takahashi, Y. Fukazawa (Hiroshima U.), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report The long GRB 091127 (Swift/BAT trigger #377179 ; Stamatikos et al., GCN 10197; Fermi/GBM trigger #281057147 ; Colleen et al., GCN 10204) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 2009-11-27 23:25:45.155 UT (=T0). The observed light curve shows a double-peaked structure starting at T0 s, ending at T0+11 s with a duration (T90) of about 7 seconds. The fluence in 100 - 1000 keV was 7.35 (-0.50, +0.43) x10^-6 erg/cm^2. The 1-s peak flux measured from T0+1 s was 8.94 (-0.70, +0.56) photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0 s to T0+11 s is well fitted by a single power-law with a photon index of 2.33 (-0.12, +0.13) (chi^2/d.o.f = 46.3/34). All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included. The light curves for this burst are available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
GCN 10230 table
GRB_name GRB091127A
GCN_number 10230
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 10230 SUBJECT: GRB 091127: Skynet/PROMPT Continued Observations of Fading DATE: 09/12/02 17:34:10 GMT FROM: Josh Haislip at U.North Carolina J. Haislip, D. Reichart, K. Ivarsen, A. LaCluyze, R. Egger, A. Foster, J. Moore, A. Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M. Nysewander report: Skynet continued to observe the afterglow (Smith et al., GCN 10192) of GRB 091127 (Troja et al., GCN 10191) with four of the 16" PROMPT telescopes at CTIO in BVRI. The light curve (Haislip et al., GCN 10107) continued to roll over. Between 25.0 hours and 3.4 days after the trigger, the afterglow faded with a power-law index of about -1.4 in all bands. At 3.2 days after the trigger, the afterglow's magnitude was R = 20.71 +0.15 -0.13 (statistical) +/- 0.37 (systematic; calibrated to 102 USNO B1 stars). Skynet's most recent BVRI light curve, calibrated to USNO B1 and NOMAD stars, can be found here: http://skynet.unc.edu/grb/grb091127.png
GCN 10233 table
GRB_name GRB091127A
GCN_number 10233
Detection_method Other
redshift 0.4903
Circular_text TITLE: GCN CIRCULAR NUMBER: 10233 SUBJECT: GRB 091127: redshift confirmation with X-shooter DATE: 09/12/02 23:41:17 GMT FROM: Antonio Deugarte at IAA-CSIC C.C. Thoene (INAF-OAB), P. Goldoni (APC/Univ. Paris 7 and SAp/CEA) S. Covino (INAF-OAB), L.A. Antonelli (INAF-OAR), D. Malesani, J.P.U. Fynbo (DARK/NBI), A.J. Levan (U. Warwick), P. Jakobsson (U. Iceland), H. Flores (Paris Obs.), B. Milvang-Jensen, J. Hjorth, D. Watson (DARK/NBI), K. Wiersema, N. R. Tanvir (Univ. Leicester), A. de Ugarte Postigo (INAF-OAB) report on behalf of the X-shooter GRB collaboration: We observed the afterglow of GRB 091127 (Troja et al. GCN 10191, Smith et al. GCN 10192) with X-shooter at the VLT starting at 03:17 UT on Dec 2, 2009. The observation consisted of 4x1500s exposures, with a mean epoch 4.2 days after the burst when the magnitude of the afterglow was R ~ 21 mag (Haislip et al. GCN 10230). We detect the continuum in the range from 3400 to 24800 Angstrom. The S/N in the blue part of the spectrum is low due to the effect of the nearby Moon. In a preliminary analysis using an archival wavelength calibration we detect several emission features superimposed on the afterglow continuum, namely [OII] (3727, 3729), H-beta (4863), [OIII] (4960, 5007) and H-alpha (6563) at a common redshift of 0.49034 +/- 0.00018. This redshift is consistent with the observations reported by Cucchiara et al. (GCN 10202). We do not detect any obvious absorption features at that redshift. We thank the ESO observing staff, in particular H. Korhonen and S. Stefl.
GCN 10238 table
GRB_name GRB091127A
GCN_number 10238
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10238 SUBJECT: GRB 091127: Zadko Telescope Observations DATE: 09/12/03 08:26:48 GMT FROM: David Coward at U of Western Aus. T.P. Vaalsta, D.M. Coward report on behalf of the Zadko Telescope Team. T.P. Vaalsta, D.M. Coward, I. Ward, J. Moore, A. Imerito, D. Blair, R. Burman, S. Gordon, A. Fletcher, A. Ahmet, A. Burrell (University of Western Australia), L. Smith (ICRAR), M. Todd, M. Zadnik (Curtin University), M. Boer, M. Laas-Bourez, (OHP-OAMP), A. Klotz, P. Thierry (CESR-OMP) The 1.0m F/4 Zadko telescope started imaging the field of GRB 091127 (trigger=377179, D. Palmer et al., GCN 10191) 18.5 hours after the Swift trigger. A faint source was found at the reported OA location (GCN 10199, S. Immler). The field was observed for 28 minutes, during this time the moon set and weather conditions were good. Photometry on the co-added sum of four CCD images of total exposure time of 806s gives a magnitude of 18.9 +/- 0.1 for the optical counterpart.
GCN 10244 table
GRB_name GRB091127A
GCN_number 10244
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10244 SUBJECT: GRB 091127, SMARTS optical/IR afterglow observations DATE: 09/12/03 23:50:51 GMT FROM: Bethany Cobb at UC Berkeley B. E. Cobb (UC Berkeley) reports: Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained optical/IR imaging of the error region of GRB 091127 (GCN 10191, Troja et al.) over seven epochs with mid-exposure times between ~2.2 and 100.8 hours post burst. The optical afterglow of GRB 091127 (e.g. GCN 10192, Smith et al. & GCN 10193, Immler et al., GCN 10194) is observed in our imaging. In our first epoch, with a mid-exposure time of ~2.2 hours post-burst, the afterglow is clearly detected in our imaging with the following magnitudes: B = 17.21 +/- 0.02 +/- 0.20 (error in zeropoint) R = 16.70 +/- 0.02 +/- 0.23 (error in zeropoint) I = 16.61 +/- 0.02 +/- 0.30 (error in zeropoint) J = 15.56 +/- 0.05 H = 15.40 +/- 0.05 K = 14.77 +/- 0.05 (Optical photometry is calibrated against USNO-B1.0 stars in the field, so suffers from a large photometric calibration error. IR photometry is calibrated against 2MASS stars.) The afterglow remains visible in our optical imaging over all our epochs of observation. Between 2.2 and 5.4 hours post burst, the afterglow decays with a power-law of alpha ~ -0.6 (where afterglow flux is proportional to t^alpha). From 27.8 to 100.8 hours post-burst, the afterglow appears to have steepened its decay rate to alpha ~ -1.6. This agrees with the behavior observed by Haislip et. al (GCNs 10219 & 10230). mid-exposure time (hours post-burst) I mag -------------------------------------------------------- 2.2 16.61 +/- 0.02 [+/- 0.30, zp error] 3.8 16.90 +/- 0.02 [+/- 0.30, zp error] 5.4 17.18 +/- 0.03 [+/- 0.30, zp error] 27.8 19.28 +/- 0.03 [+/- 0.30, zp error] 30.6 19.34 +/- 0.03 [+/- 0.30, zp error] 51.7 21.10 +/- 0.12 [+/- 0.30, zp error] 100.8 21.38 +/- 0.07 [+/- 0.30, zp error]
GCN 10245 table
GRB_name GRB091127A
GCN_number 10245
Detection_method Swift-UVOT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 10245 SUBJECT: GRB091127: Continuing Swift/UVOT Observations DATE: 09/12/04 14:27:58 GMT FROM: Frank Marshall at GSFC F. E. Marshall (NASA/GSFC) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift/UVOT team: After a relatively flat initial decay, the light curve of the optical afterglow of GRB 091127 (Smith et al. GCN Circ. 10192; Immler & Troja, GCN Circ. 10193) has steepened to a decay index of 1.44 in UVOT observations with the white filter. At 5.2 days after the BAT trigger (Troja et al., GCN Circ. 10191), the white magnitude is 21.8 +/- 0.1. Similar light curves are seen for the UVOT V and U filters. The current decay index is close to that reported by Haislip et al. (GCN Circ. 10230) using observations between 25 and 77 hours after the trigger, and by Cobb (GCN Circ. 10244) using data from 27.8 to 100.8 hours after the trigger. UVOT observations of the afterglow are continuing.
GCN 10248 table
GRB_name GRB091127A
GCN_number 10248
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10248 SUBJECT: GRB 091127: GAO 150cm telescope Optical Observation DATE: 09/12/05 08:59:45 GMT FROM: Kenzo Kinugasa at Gunma Astro. Obs/Japan K. Kinugasa, S. Honda, O. Hashimoto, H. Takahashi, H. Taguchi (Gunma Astronomical Observatory) report: The position of GRB 091127 (Troja et al., GCN 10191) was observed with the 150 cm telescope of Gunma Astronomical Observatory. Starting at 13:45:44 and 14:04;55 UT on Nov.28 ( about 14.3 and 14.7 hours after the trigger), Ic and Rc frames were acquired for sets of 5 x 3-min and 5 x 3-min exposures, respectively. We detected the optical counterpart (e.g., Smith et al., GCN 10192; Immler et al., GCN 10193) in all frames. We estimated the Rc and Ic magnitudes relative to USNO-B1.0 R2 and I magnitudes, respectively. mid-UT T0+(d) exp mag. ----------------------------------------------- 13:54:51 0.6035 5x3min Rc=18.37+-0.13 14:16:39 0.6187 5x3min Ic=18.62+-0.32 ----------------------------------------------- The R magnitude is well fitted with the fading trend from the other observations (e.g., Xu et al. GCN 10205; Sndreev et al. GCN 10207; Haislip et al. GCN 10219).
GCN 10249 table
GRB_name GRB091127A
GCN_number 10249
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 10249 SUBJECT: GRB 091127: Skynet/PROMPT Observations of Possible Host Galaxy DATE: 09/12/05 19:43:23 GMT FROM: Josh Haislip at U.North Carolina J. Haislip, D. Reichart, K. Ivarsen, A. LaCluyze, R. Egger, A. Foster, J. Moore, A. Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M. Nysewander report: Skynet continued to observe the afterglow (Smith et al., GCN 10192) of GRB 091127 (Troja et al., GCN 10191) with four of the 16" PROMPT telescopes at CTIO in BVRI (Haislip et al., GCNs 10107, 10230) Between 4.1 and 7.3 days after the trigger, the light curve is consistent with constant emission, which suggests that we are observing the host galaxy. If so, we measure its brightness to be: I = 21.19 +/- 0.14 (statistical) +/- 0.39 (systematic; calibrated to 65 USNO B1 stars). R = 21.27 +/- 0.13 (statistical) +/- 0.37 (systematic; calibrated to 115 USNO B1 stars). V > 21.9 (3 sigma; calibrated to 14 NOMAD stars). B > 21.2 (3 sigma; calibrated to 65 USNO B1 stars).
GCN 10400 table
GRB_name GRB091127A
GCN_number 10400
Detection_method Optical
redshift 0.4900
Circular_text TITLE: GCN CIRCULAR NUMBER: 10400 SUBJECT: GRB 091127: Detection of a Supernova DATE: 10/02/11 03:45:12 GMT FROM: Bethany Cobb at UC Berkeley B. E. Cobb, J. S. Bloom, S. B. Cenko, D. A. Perley (UC Berkeley) report on behalf of a larger collaboration: We have obtained multiple epochs of imaging of the field of GRB 091127 (Troja et al., GCN 10191) using the Gemini Multi-Object Spectrograph (GMOS) on the 8 m Gemini South telescope and the ANDICAM instrument on the 1.3m telescope at CTIO. For the first ~10 days post-burst, the optical afterglow of the GRB (e.g. Smith et al., GCN 10192, Immler et al., GCN 10193, Cobb, GCN 10244) dominates the burst's optical emissions. After 10 days post-burst, however, we find evidence of an additional component of light which rises and then fades, and we consider this to be due to an underlying SN related to this GRB. The rise and decay characteristics of this GRB-SN are globally similar to those of the prototypical GRB-SN, SN1998bw. The SN reaches peak brightness at approximately 30 days post-burst, which is consistent with the rise-time expected for a GRB-SN at redshift z=0.49 (Cucchiara et al., GCN 10202 & Thoene et al., GCN 10233). The observed peak magnitude of the SN (and any underlying contribution from a host galaxy) is I~21.7. Correcting for a small amount of Galactic reddening (A_V=0.125) and assuming little or no host-galaxy reddening (which is consistent with the observations of the optical afterglow of the GRB), the absolute magnitude of this GRB-SN is V~-20.5. Observations and analysis of this GRB-SN are ongoing.