GRB111008A

This page lists all entries on GRB111008A in GRBweb

Summary IPN Swift GCN 12423 GCN 12424 GCN 12425 GCN 12426 GCN 12427 GCN 12428 GCN 12429 GCN 12430 GCN 12431 GCN 12432 GCN 12433 GCN 12434 GCN 12436 GCN 12437

Summary table
Variable Value Source
T0 22:12:58 UTC GCN_circulars,Swift Det
ra 60.4510° Swift
decl -32.7093° Swift
pos_error 1.81e-04° Swift
T90 63.46 s Swift
T90_start 22:12:58 UTC Swift
fluence 5.30e-06 erg/cm² Swift
redshift 5.0000 GCN_circulars,Optical
T100 63.46 s
GBM_located False
mjd 55842.925671296296 GCN_circulars,Swift Det
IPN table
GRB_name GRB111008A
ra 60.4542°
decl -32.6833°
pos_error 5.00e-02°
redshift 4.9898
Swift table
GRB_name GRB111008A
t_trigger 22:12:58 UTC
ra 60.4510°
decl -32.7093°
pos_error 1.81e-04°
T90 63.46 s
fluence 5.30e-06 erg/cm²
redshift 5.0000
GCN 12423 table
GRB_name GRB111008A
GCN_number 12423
Detection_method Swift Det
t_trigger 22:12:58 UTC
ra 60.4540°
decl -32.6890°
Circular_text TITLE: GCN CIRCULAR NUMBER: 12423 SUBJECT: GRB 111008A: Swift detection of a burst DATE: 11/10/08 22:22:55 GMT FROM: Scott Barthelmy at NASA/GSFC C. J. Saxton (UCL-MSSL), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL), O. M. Littlejohns (U Leicester), F. E. Marshall (NASA/GSFC), C. Pagani (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL) and C. A. Swenson (PSU) report on behalf of the Swift Team: At 22:12:58 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 111008A (trigger=505054). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 60.454, -32.689, which is RA(J2000) = 04h 01m 49s Dec(J2000) = -32d 41' 18" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows 3 sets of peaks with a total duration of about 70 sec. The peak count rate was ~4000 counts/sec (15-350 keV), at ~1 sec after the trigger. The XRT began observing the field at 22:14:29.8 UT, 91.5 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 60.4491, -32.7098 which is equivalent to: RA(J2000) = 04h 01m 47.78s Dec(J2000) = -32d 42' 35.2" with an uncertainty of 4.9 arcseconds (radius, 90% containment). This location is 76 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy. UVOT took a finding chart exposure of 150 seconds with the White filter starting 98 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01. Burst Advocate for this burst is C. J. Saxton (cjs2 AT mssl.ucl.ac.uk). 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 12424 table
GRB_name GRB111008A
GCN_number 12424
Detection_method Swift-BAT Det
ra 60.4390°
decl -32.7080°
Circular_text TITLE: GCN CIRCULAR NUMBER: 12424 SUBJECT: GRB 111008A, Swift-BAT refined analysis, DATE: 11/10/09 01:01:29 GMT FROM: Hans Krimm at NASA-GSFC W. H. Baumgartner (GSFC/UMBC),S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), C. J. Saxton (UCL-MSSL), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+302 sec from the recent telemetry downlink, we report further analysis of BAT GRB 111008A (trigger #505054) (Saxton, et al., GCN Circ. 12423). The BAT ground-calculated position is RA, Dec = 60.439, -32.708 deg which is RA(J2000) = 04h 01m 45.3s Dec(J2000) = -32d 42' 29.3" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 9%. The mask-tagged light curve shows three clusters of peaks, each containing at least two subpeaks, and with returns to the baseline between clusters. Each cluster is softer and weaker than the one preceding it. The first cluster runs from T-10 sec to T+10 sec, the second runs from T+28 sec to T+35 sec, and the third from T+58 to T+65 sec. We note that there is a gap in the telemetry from T+180 to T+240 sec, but there is no indication of any emission between the last peak and the gap or after the gap. T90 (15-350 keV) is 63.46 +- 2.19 sec (estimated error including systematics). The time-averaged spectrum from T-2.64 to T+68.80 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.86 +- 0.09. The fluence in the 15-150 keV band is 5.3 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.04 sec in the 15-150 keV band is 6.4 +- 0.7 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/505054/BA/
GCN 12425 table
GRB_name GRB111008A
GCN_number 12425
Detection_method Swift-XRT Det
ra 60.4509°
decl -32.7095°
Circular_text TITLE: GCN CIRCULAR NUMBER: 12425 SUBJECT: GRB 111008A: Enhanced Swift-XRT position DATE: 11/10/09 02:49:05 GMT FROM: Phil Evans at U of Leicester A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team. Using 1125 s of XRT Photon Counting mode data and 1 UVOT images for GRB 111008A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 60.45094, -32.70947 which is equivalent to: RA (J2000): 04h 01m 48.22s Dec (J2000): -32d 42' 34.1" with an uncertainty of 1.7 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 12426 table
GRB_name GRB111008A
GCN_number 12426
Detection_method Optical
ra 61.2010°
decl -32.7093°
Circular_text TITLE: GCN CIRCULAR NUMBER: 12426 SUBJECT: GRB 111008A: Gemini optical counterpart DATE: 11/10/09 05:21:05 GMT FROM: Andrew Levan at U.of Leicester A.J. Levan (Warwick), K. Wiersema, N.R. Tanvir (Leicester) report on behalf of a larger collaboration: "We observed the field of GRB 111008A (Saxton et al. GCN 12423) with Gemini-South in the r-band. Observations began at 03:12 UT, 5 hours after the BAT trigger. Within the refined XRT error circle (Beardmore GCN 12425) we locate a single object at RA(J2000) 04:04:48.24 DEC(J2000) -32:42:33.4 with an error of 0.5" in each axis. Preliminary photometry against USNO-B1 suggests R~22.8. We suggest this may be the afterglow of GRB 111008A. Further spectroscopic observations are in progress. We thank the Gemini staff for the rapid and efficient execution of these observations."
GCN 12427 table
GRB_name GRB111008A
GCN_number 12427
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 12427 SUBJECT: GRB 111008A: NOT optical observation DATE: 11/10/09 06:29:50 GMT FROM: Dong Xu at Weizmann Inst D. Xu (WIS), D. Malesani (DARK/NBI), L.A. Buchhave (NBI), S. Schulze, P. Jakobsson (U. Iceland) report on behalf of a larger collaboration: We observed the field of GRB 111008A (Saxton et al., GCN 12423) with the 2.5m Nordic Optical Telescope (NOT) equipped with ALFOSC. We obtained 2x600 s R-band images, starting at 04:40:07 UT 9th Oct. 2011 (i.e., 6.45 hr after the burst). The optical afterglow reported in Levan et al. (GCN 12426) was detected at R ~ 22.3 mag, calibrated against the #0572-0051383 star (R2=16.77) in the USNO-B1.0 catalog.
GCN 12428 table
GRB_name GRB111008A
GCN_number 12428
Detection_method GROND
ra 60.4510°
decl -32.7092°
Circular_text TITLE: GCN CIRCULAR NUMBER: 12428 SUBJECT: GRB 111008A, GROND observations DATE: 11/10/09 06:31:49 GMT FROM: Sylvio Klose at TLS Tautenburg M. Nardini (Milano Bicocca), S. Klose (TLS Tautenburg), J. Greiner (MPE Garching), and P. Afonso (MPE/American River College) report on behalf of the GROND team: We observed the field of GRB 111008A (Saxton et al., GCN #12423) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG/ESO telescope at La Silla Observatory (Chile). Observations started at 4:30 UT on October 08, 6.3 hours after the GRB trigger. We detect a point source within the 1.7 arcsec enhanced Swift-XRT error circle (Beardmore et al., GCN #12425) at coordinates RA, DEC (J2000) = 04:01:48.25, -32:42:33.2 (+/-0.5"), confirming the observations from Gemini (Levan et al., GCN 12426). Preliminary magnitudes at a meantime of 5:15 UT are (in the AB system): g' > 24.0, r' = 22.6 +/- 0.1, i' = 20.9 +/- 0.1, z' = 19.9 +/- 0.1, indicating a cosmological g-band dropout. Data are calibrated against GROND zeropoints. Observations are ongoing.
GCN 12429 table
GRB_name GRB111008A
GCN_number 12429
Detection_method Optical
ra 60.4510°
decl -32.7093°
redshift 5.0000
Circular_text TITLE: GCN CIRCULAR NUMBER: 12429 SUBJECT: GRB 111008A: Gemini spectroscopic redshift DATE: 11/10/09 06:31:58 GMT FROM: Andrew Levan at U.of Leicester A.J. Levan (Warwick), K. Wiersema, N.R. Tanvir (Leicester) report for a larger collaboration: "We obtained optical spectroscopy of the candidate counterpart of GRB 111008A (Saxton et al. GCN 12423, Levan et al. GCN 12426), with GMOS on Gemini-South. Observations were centred at 6000A, and cover the region from 3900-8100A. We see flux from the candidate afterglow down to ~5500A, and a broad absorption feature centred at ~7300A, with a brighter continuum red-ward of this. If interpreted as a DLA then this suggests that the redshift of GRB 111008A is z~5. We also find weak absorption lines of Ly-beta, OI(1302), CII(1334) and SiII (1260.5), consistent with a common redshift of z=5.0. We note that there was a typographical error in the co-ordinates of GCN 12426, which should have read RA(J2000) 04:01:48.24 DEC(J2000) -32:42:33.4 We thank Javier Gorosabel for pointing this error out, and apologise for any confusion."
GCN 12430 table
GRB_name GRB111008A
GCN_number 12430
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 12430 SUBJECT: GRB 111008A: Swift-XRT refined Analysis DATE: 11/10/09 08:52:45 GMT FROM: Claudio Pagani at U of Leicester C. Pagani (U Leicester) and C. J. Saxton (UCL-MSSL) report on behalf of the Swift-XRT team: We have analysed 5.1 ks of XRT data for GRB 111008A (Saxton et al. GCN Circ. 12423), from 81 s to 24.0 ks after the BAT trigger. The data comprise 223 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 12425). The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=7.1 (+0.9, -1.0). At T+103 s the decay flattens to an alpha of 3.22 (+/-0.12). The light curve breaks again at T+311 s to a decay with alpha=0.26 (+/-0.16), before a final break at T+4539 s s after which the decay index is 0.99 (+0.12, -0.11). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.64 (+0.11, -0.10). The best-fitting absorption column is 8.3 (+1.7, -1.6) x 10^20 cm^-2, in excess of the Galactic value of 9.8 x 10^19 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.02 (+/-0.11) and a best-fitting absorption column of 4.3 (+2.1, -2.0) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.5 x 10^-11 (4.0 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 4.3 (+2.1, -2.0) x 10^20 cm^-2 Galactic foreground: 9.8 x 10^19 cm^-2 Excess significance: 3.6 sigma Photon index: 2.02 (+/-0.11) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00505054. This circular is an official product of the Swift-XRT team.
GCN 12431 table
GRB_name GRB111008A
GCN_number 12431
Detection_method Optical
redshift 4.9898
Circular_text TITLE: GCN CIRCULAR NUMBER: 12431 SUBJECT: GRB 111008A: VLT/X-shooter spectroscopy DATE: 11/10/09 11:03:04 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst K. Wiersema (Univ. Leicester), H. Flores (GEPI/Obs. de Paris), V. D'Elia (ASI/ASDC & INAF/OAR), P. Goldoni (APC/Univ. Paris 7 & SAp/CEA), D. Malesani (DARK/NBI), S. D. Vergani (INAF/OABr), A. de Ugarte Postigo (IAA-CSIC), A. J. Levan (Univ. Warwick), B. Milvang-Jensen, J. P. U. Fynbo (DARK/NBI), report on behalf of a larger collaboration: We observed the optical counterpart of GRB 111008A (Saxton et al., GCN 12423; Levan et al., GCN 12426; Xu et al., GCN 12427; Nardini et al., GCN 12428), using the X-shooter spectrograph mounted on the ESO-VLT. Observations started on 2011 October 9.247 UT (7.71 hr after the GRB), with a total exposure time of 2 hr, covering the wavelength range 3000-25000 AA. Continuum is clearly detected redwards of ~7600 AA, with several, strong superimposed absorption features, consistent with a commom redshift z = 4.9898. Among them, we note several Si II and Fe II transitions, the CIV doublet, the Mg II doublet (in the H band), and several fine-structure lines commonly observed in GRB afterglow spectra (such as Si II*, S II*, O I*). We also note the presence of an intervening Mg II system at z = 4.61. Our results are thus consistent with the redshift derived by Levan et al. (GCN 12429; see also Nardini et al., GCN 12428). We acknowledge excellent support from the observing staff in Paranal, in particular Christophe Martayan, Claudio Melo, Leonel Rivas, and Sergio Vera.
GCN 12432 table
GRB_name GRB111008A
GCN_number 12432
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 12432 SUBJECT: GRB 111008A: IAC80 I-band observations DATE: 11/10/09 14:05:45 GMT FROM: Rubén Sánchez-Ramírez at IAA-CSIC R. Sanchez-Ramirez (IAA-CSIC), J. Gorosabel (IAA-CSIC), M. Cebrian (IAC), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), P. Montaes (IAC), A. Rodriguez Anton (IAC), report on behalf of a larger collaboration: "We observed the field of GRB 111008A (Saxton et al., GCN Circ 12423) with the 82cm IAC80 telescope at the Observatorio del Teide, Tenerife, Spain. We acquired 22 x 300s I-band images on Oct 9.12973 - Oct 9.21239 UT (average epoch 5.90h after the trigger) . A preliminary analysis of the combined frame shows the source reported by Levan et al. (GCN Circ 12426) with a magnitude of I ~ 20.6 (calibrated against USNO-B1 stars)."
GCN 12433 table
GRB_name GRB111008A
GCN_number 12433
Detection_method Konus-Wind Det
t_trigger 22:13:01.676 UTC
redshift 5.0000
Circular_text TITLE: GCN CIRCULAR NUMBER: 12433 SUBJECT: Konus-Wind observation of GRB 111008A DATE: 11/10/09 14:58:01 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 111008A (Swift-BAT trigger #505054: Saxton et al., GCN 12433; Baumgartner et al., GCN 12434) triggered Konus-Wind at T0=79981.676s UT (22:13:01.676) The burst light curve shows an initial pulse which peaked at T0+0.256s and a softer weaker pulse at ~T0+30s. A total burst duration is ~40 s. The emission is seen up to ~2 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB111008_T79981/ As observed by Konus-Wind the burst had a fluence of (9.0 0.9)x10-6 erg/cm2, and a 256-ms peak flux, measured from T0+0.256 s, of (1.4 0.3)x10-6 erg/cm2/s (both in the 20 keV - 2 MeV energy range). The time-integrated spectrum of the burst (measured from T0 to T0+41.216 s) is best fitted in the 20 keV - 2 MeV range by a simple power-law model with index (2.02 0.09), chi2 = 54.3/59 dof. The spectrum of the initial pulse (measured from T0 to T0+8.448 s) is best fitted in the 20 keV - 2 MeV range by a power law with exponential cutoff model, for which alpha = -1.36 (-0.21, +0.24), and Ep = 149(-28, +52) keV, chi2 = 38.4/58 dof. Assuming the redshift z=5.0 (Levan et al., GCN 12429; Wiersema et al., GCN 12431) and a standard cosmology model with H_0 = 71 km/s/Mpc, Omega_M = 0.27, Omega_Lambda = 0.73, the isotropic energy release E_iso is (4.1 0.4)x10^53 erg, the isotropic peak luminosity L_iso_max is (3.8 0.7)x10^53 erg/s, and Ep_rest is 894(-168,+312) keV (the initial pulse spectrum). All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.
GCN 12434 table
GRB_name GRB111008A
GCN_number 12434
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 12434 SUBJECT: GRB 111008A: Swift/UVOT Upper Limits DATE: 11/10/09 18:37:31 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin (MSSL-UCL) and C. J. Saxton (UCL-MSSL) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 111008A 99 s after the BAT trigger (Saxton et al., GCN Circ. 12423). No optical afterglow consistent with the refined XRT position (Beardmore et al., GCN 12425; see also Levan et al. GCN 12426, Nardini et al. GCN 12428, and Wiersema et al. GCN 12431) is detected in the initial UVOT exposures, consistent with the redshift reported by Levan et al. and Wiersema et al.. Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 99 249 147 >21.3 u_FC 311 561 246 >20.5 white 99 1359 373 >21.8 v 641 1409 97 >19.0 b 566 1335 78 >19.7 u 311 1310 304 >20.6 w1 690 1457 77 >19.2 m2 666 1433 97 >21.0 w2 617 1385 97 >19.8 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN 12436 table
GRB_name GRB111008A
GCN_number 12436
Detection_method Swift-XRT Other
ra 60.4510°
decl -32.7091°
Circular_text TITLE: GCN CIRCULAR NUMBER: 12436 SUBJECT: EVLA 22 GHz Detection of GRB 111008A DATE: 11/10/13 15:29:15 GMT FROM: Ashley Zauderer at CfA A. Zauderer, E. Berger (Harvard), and D. Frail (NRAO) report: "We observed the position of GRB 111008A (GCN 12423 ) with the EVLA beginning 2011 October 10.37 UT (1.4 days after the burst). At 22 GHz, we detect a radio source consistent with the Swift-XRT error circle (GCN 12425) and the candidate optical counterpart (GCN 12429) at a position of RA: 04:01:48.24 (+/- 0.04) Dec: -32:42:32.7 (+/- 0.6) Further observations are planned."
GCN 12437 table
GRB_name GRB111008A
GCN_number 12437
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 12437 SUBJECT: GRB 111008A : miniTAO/ANIR NIR observations DATE: 11/10/14 16:04:57 GMT FROM: Takeo Minezaki at U.of Tokyo/Astro M. Konishi, K. Tateuchi, K. Motohara, T. Tanabe, T. Kamizuka, A. Nakashima, T. Minezaki, and Y. Yoshii (University of Tokyo), S. Komugi (NAOJ/ALMA), S. Manabe (Kobe University), report on behalf of the TAO project team We report the near-infrared (NIR) imaging observation of GRB111008A (Saxton et al., GCN 12423) using NIR Camera ANIR mounted on the miniTAO 1.0m telescope at the University of Tokyo Atacama Observatory, located on the summit of Co. Chajnantor (5,640m altitude) in the northern Chile. Observations started at 04:36 UT on October 09, approximately 6 hours after the burst. We detect a point source at the coordinate reported by Levan et al. (GCN 12426) in the JHKs-bands. The preliminary magnitudes are J = 19.79 +/- 0.18, H = 19.47 +/- 0.19, Ks = 19.38 +/- 0.17, in AB system.