GRB091208B

This page lists all entries on GRB091208B in GRBweb

Summary Fermi GBM IPN Swift Fermi LAT GCN 10255 GCN 10256 GCN 10257 GCN 10258 GCN 10259 GCN 10260 GCN 10262 GCN 10263 GCN 10265 GCN 10266 GCN 10267 GCN 10268 GCN 10269 GCN 10271 GCN 10272 GCN 10273 GCN 10275 GCN 10279

Summary table
Variable Value Source
GRB_name_Fermi GRB091208410
T0 9:49:57 UTC Fermi_LAT
ra 29.3922° Fermi_LAT
decl 16.8897° Fermi_LAT
pos_error 0.00e+00° Fermi_LAT
T90 12.48 s Fermi_GBM
T90_error 5.018 s Fermi_GBM
T90_start 9:49:57.828 UTC Fermi_GBM
fluence 6.19e-06 erg/cm² Fermi_GBM
fluence_error 1.90e-07 erg/cm² Fermi_GBM
redshift 1.0630
T100 14.9 s
GBM_located False
mjd 55173.4096875 Fermi_LAT
Fermi GBM table
GRB_name_Fermi GRB091208410
trigger_name bn091208410
ra 29.3921°
decl 16.8900°
pos_error 3.20e+00°
datum 2009-12-08
t_trigger 9:49:57.956 UTC
T90 12.48 s
T90_error 5.018 s
T90_start 9:49:57.828 UTC
fluence 6.19e-06 erg/cm²
fluence_error 1.90e-07 erg/cm²
flux_1024 2.06e+01 erg/cm²/s
flux_1024_error 3.17e-01 erg/cm²/s
flux_1024_time 8.19e+00 erg/cm²/s
flux_64 3.10e+01 erg/cm²/s
flux_64_error 1.43e+00 erg/cm²/s
IPN table
GRB_name GRB091208B
ra 29.4125°
decl 16.8833°
pos_error 5.00e-02°
redshift 1.0630
Swift table
GRB_name GRB091208B
t_trigger 9:49:57 UTC
ra 29.3920°
decl 16.8897°
pos_error 7.77e-05°
T90 14.9 s
fluence 3.30e-06 erg/cm²
redshift 1.0630
Fermi LAT table
GRB_name_Fermi GRB091208410
GRB_name GRB091208B
MET 281958599.0
datum 2009-12-08
t_trigger 9:49:57 UTC
ra 29.3922°
decl 16.8897°
pos_error 0.00e+00°
GCN 10255 table
GRB_name GRB091208B
GCN_number 10255
Detection_method Optical
ra 29.3922°
decl 16.8897°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10255 SUBJECT: GRB 091208B: BOOTES-3 optical afterglow DATE: 09/12/08 10:11:30 GMT FROM: Antonio Deugarte at IAA-CSIC A. de Ugarte Postigo (INAF-OAB), A.J. Castro-Tirado, J. Gorosabel, M. Jelinek (IAA-CSIC), P. Kubanek (IPL UV, IAA-CSIC), R. Cunniffe, S. Guziy (IAA-CSIC), P. Yock (Auckland Univ.), W.H. Allen (Vintage Lane Obs.), I. Bond (Massey Univ.), G. Christie (Stardome Obs.), report on behalf of a larger collaboration, report: "We have observed the field of GRB091208B (Swift trigger 378559) using the 0.6m Yock-Allen robotic telescope (BOOTES-3) located in Bleinheim, New Zealand. Observations began at 05:50:04 UT (45 sec after the burst). There is a bright optical counterpart within the XRT error circle at coordinates (J2000 +/- 1"): R.A.: 01:57:34.13 Dec.: +16:53:23.00 Further observations are ongoing." [GCN OPS NOTE(11oct09): Per author's request, the time was changed from "05:50:04" to "09:50:04".]
GCN 10256 table
GRB_name GRB091208B
GCN_number 10256
Detection_method Swift Det
t_trigger 9:49:57 UTC
ra 29.4100°
decl 16.8830°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10256 SUBJECT: GRB 091208B: Swift detection of a burst with an optical afterglow DATE: 09/12/08 10:13:59 GMT FROM: Claudio Pagani at PSU/Swift-XRT C. Pagani (PSU), A. P. Beardmore (U Leicester), P. A. Evans (U Leicester), C. Gronwall (PSU), S. T. Holland (CRESST/USRA/GSFC), N. P. M. Kuin (MSSL), C. B. Markwardt (CRESST/GSFC/UMD), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), A. Rowlinson (U Leicester), M. Stamatikos (OSU/NASA/GSFC), G. Tagliaferri (INAF-OAB) and L. Vetere (PSU) report on behalf of the Swift Team: At 09:49:57 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 091208B (trigger=378559). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 29.410, +16.883 which is RA(J2000) = 01h 57m 39s Dec(J2000) = +16d 52' 57" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 15 sec. The peak count rate was ~9100 counts/sec (15-350 keV), at ~8 sec after the trigger. The XRT began observing the field at 09:51:53.1 UT, 115.2 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 29.3920, 16.8899 which is equivalent to: RA(J2000) = 01h 57m 34.09s Dec(J2000) = +16d 53' 23.6" with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 66 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (4.85e+20 cm^-2, Kalberla et al. 2005), with an excess column of 3.3 (+1.52/-1.28) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 150 seconds with the White filter starting 119 seconds after the BAT trigger. There is an afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 01:57:34.06 = 29.39193 DEC(J2000) = +16:53:22.7 = 16.88963 with a 90%-confidence error radius of about 0.6 arc sec. This position is 0.67 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.9. No correction has been made for the expected extinction corresponding to E(B-V) of 0.05. There is a bright afterglow candidate consistent with the XRT position. Burst Advocate for this burst is C. Pagani (pagani AT astro.psu.edu). 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 10257 table
GRB_name GRB091208B
GCN_number 10257
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10257 SUBJECT: GRB 091208B, RIMOTS optical upper limits DATE: 09/12/08 11:57:37 GMT FROM: Kazuhiro Noda at Miyazaki U K.Noda, K.Kono, E.Sonoda, N.Ohmori, H.hayasi, A.Daikyuji, Y.Nisioka, M.Yamauchi (University of Miyazaki) We have observed the field covering the error circle of GRB GRB091208B (Swift trigger 378559, GCN 10256, C. Pagani et al.) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 09:59:30 UT, about 9.5 min after the Swift trigger time. We have compared our data of 30 sec exposures with the USNO-A2.0 catalog, There is no new source at the reported position. (GCN 10255, A. de Ugarte Postigo et al.) the upper limits are as follows: -------------------------------------------------------------- Start(UT) End(UT) Num. of frames Limit (mag.) -------------------------------------------------------------- 09:59:30 10:00:00 1 15.9 09:59:30 10:47:23 37 17.3 ---------------------------------------------------------------
GCN 10258 table
GRB_name GRB091208B
GCN_number 10258
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 10258 SUBJECT: GRB 091208B: MITSuME Okayama Optical Observation DATE: 09/12/08 12:06:40 GMT FROM: Michitoshi Yoshida at Okayama Astrophysical Obs M. Yoshida, D. Kuroda, K. Yanagisawa, Y. Shimizu, S. Nagayama, H. Toda (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 091208B (Pagani et al., GCN 10256) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory. The observation started at 09:57:03 2009-12-08 UT, 426s after the trigger. We detected the optical afterglow previously reported by de Ugarte Postigo et al. (GCN 10255) and Pagani et al. (GCN 10256) in all the three bands. The preliminary photometry results of the OT are listed below. We used GSC2.3 catalog for flux calibration. #PDAY MID-UT T-EXP g' Rc Ic ------------------------------------------------------------------ 0.00855 10:02:17 540.0 18.4 $B!^(B 0.2 17.6 $B!^(B 0.1 17.0 $B!^(B 0.2 0.01615 10:13:14 540.0 18.5 $B!^(B 0.2 18.1 $B!^(B 0.2 17.4 $B!^(B 0.2 ------------------------------------------------------------------
GCN 10259 table
GRB_name GRB091208B
GCN_number 10259
Detection_method Swift-XRT Det
ra 29.3922°
decl 16.8896°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10259 SUBJECT: GRB 091208B: Enhanced Swift-XRT position DATE: 09/12/08 12:50:30 GMT FROM: Phil Evans at U of Leicester J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team. Using 466 s of XRT Photon Counting mode data and 1 UVOT images for GRB 091208B, 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 = 29.39223, +16.88965 which is equivalent to: RA (J2000): 01h 57m 34.13s Dec (J2000): +16d 53' 22.7" with an uncertainty of 1.8 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 10260 table
GRB_name GRB091208B
GCN_number 10260
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 10260 SUBJECT: GRB 091208B: MITSuME Akeno Optical Observation DATE: 09/12/08 13:34:54 GMT FROM: Nobuyuki Kawai at Tokyo Tech H. Nakajima, Y. Yatsu, Y.A. Mori, A. Endo, T. Shimokawabe, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 091208B (Pagani et al., GCN 10256) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope at Akeno, Japan. The observation started at 2009-12-08 09:50:45 UT, 48s after the trigger. We detected the optical afterglow (de Ugarte Postigo et al. GCN 10255, Pagani et al. GCN 10256, Yoshida et al. GCN 10258) in all the three bands. The preliminary photometry results of the OT are listed below. We used GSC2.3 catalog for flux calibration. MID-UT T-EXP g' Rc Ic ------------------------------------------------------------------ 09:51:15 60.0 17.2 $B!^(B 0.2 16.1 $B!^(B 0.1 15.5 $B!^(B 0.1 ------------------------------------------------------------------
GCN 10262 table
GRB_name GRB091208B
GCN_number 10262
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10262 SUBJECT: GRB 091208B: Faulkes Telescope North and South Optical Afterglow DATE: 09/12/08 13:52:33 GMT FROM: Zach Cano at ARI/John Moores Liverpool Z. Cano, A. Melandri, C.G. Mundell (Liverpool JMU), A. Gomboc (U. Ljubljana), D. Bersier, N.R. Clay, S. Kobayashi, C.J. Mottram, R.J. Smith, I.A. Steele (Liverpool JMU), C. Guidorzi (U. Ferrara) report on behalf of a large collaboration: The 2-m Faulkes Telescopes North and South robotically followed up GRB091208B (SWIFT trigger 378559; Pagani et al. GCN 10256) beginning 1.78 min after the GRB trigger time. We detect the optical afterglow in BRi' filters at the location reported by de Ugarte Postigo et al. (GCN 10255) and Pagani et al. (GCN 10256). We derive the following preliminary magnitudes wrt USNOB1: Filter Mag Merr T-To (s) ------------------------------------------- R 17.75 0.02 572 R 18.48 0.03 1656 I 17.51 0.05 1036 I 18.34 0.04 3749 From our observations we derive a power-law decay constant of ~ 0.6 for both filters. We have not corrected our magnitudes for the small amount of foreground reddening along the line of sight (E(B-V) = 0.05, corresponding to Av = 0.17 (Schlegel et al. 1998)). Observations and analysis are ongoing. This message may be cited.
GCN 10263 table
GRB_name GRB091208B
GCN_number 10263
Detection_method Other
redshift 1.0630
Circular_text TITLE: GCN CIRCULAR NUMBER: 10263 SUBJECT: GRB 091208B: Gemini-North redshift DATE: 09/12/08 15:09:46 GMT FROM: Klaas Wiersema at U of Leicester K. Wiersema, N. R. Tanvir (U. Leicester), A. Cucchiara (PSU), A. J. Levan (U. Warwick) & D. Fox (PSU) report: We observed the afterglow of GRB 091208B (Pagani et al. GCN 10256; de Ugarte Postigo et al. GCN 10255) with the GMOS-N spectrograph on Gemini North, beginning at 11:17 UT on December 8. We use the R400 grism. The resulting spectrum covers the wavelength range 4000-8400 A and shows clear absorption lines of the MgII doublet (2796,2803), MgI (2853), FeI (2967), FeII (2586,2600) and MnII (2576,2594,2606) at a common redshift of z = 1.063. We thank the Gemini-N staff, in particular K. Chiboucas, for performing this observation.
GCN 10265 table
GRB_name GRB091208B
GCN_number 10265
Detection_method Swift-BAT Det
ra 29.4110°
decl 16.8810°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10265 SUBJECT: GRB 091208B, Swift-BAT refined analysis DATE: 09/12/08 15:59:30 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift 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/UMD), D. M. Palmer (LANL), C. Pagani (PSU), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (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 091208B (trigger #378559) (Pagani, et al., GCN Circ. 10256). The BAT ground- calculated position is RA, Dec = 29.411, 16.881 deg which is RA(J2000) = 01h 57m 38.5s Dec(J2000) = +16d 52' 50.7" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 10%. The mask-weighted light curve shows two separated FRED peaks. The first at T0 was weaker and softer than the second at T+8 sec. T90 (15-350 keV) is 14.9 +- 3.7 sec (estimated error including systematics). The time-averaged spectrum from T-0.2 to T+22.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.74 +- 0.11. The fluence in the 15-150 keV band was 3.3 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+8.1 sec in the 15-150 keV band was 15.2 +- 1.0 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/378559/BA/
GCN 10266 table
GRB_name GRB091208B
GCN_number 10266
Detection_method Fermi GBM Det
t_trigger 9:49:57.960 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 10266 SUBJECT: GRB 091208B: Fermi GBM observation DATE: 09/12/08 17:42:47 GMT FROM: Sheila McBreen at MPE S. McBreen (UCD/MPE) reports on behalf of the Fermi GBM Team: "At 09:49:57.96 UT on 08 December 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 091208B (trigger 281958599 / 091208410) which was also detected by the Swift-BAT (Pagani et al. 2009, GCN 10256). The GBM on-ground location is consistent with the Swift position. This burst was also independently detected by INTEGRAL SPI-ACS. The angle from the Fermi LAT boresight is 56 degrees. Moreover, this burst was bright enough to result in a Fermi spacecraft repointing maneuver. The GBM light curve consists of two pulses with a duration (T90) of about 15 s (8-1000 keV). The time-averaged spectrum from T0-0.128 s to T0+14.592 s is well fit by a power law function with an exponential high energy cutoff. The power law index is -1.48 (+0.05/-0.05) and the cutoff energy, parameterized as Epeak, is 144.20 (+18.00/-13.90) keV (CSTAT 829 for 604 d.o.f.). The event fluence (8-1000 keV) in this time interval is (5.8 +/- 0.2)E-06 erg/cm^2. The 0.128 sec peak photon flux measured starting from T0+8.45 s in the 8-1000 keV band is 32.4 +/- 1.1 ph/s/cm^2. A Band function fits the spectrum equally well (CSTAT 827 for 603 d.o.f.) with Epeak= 124.00 (+20.10/-19.40) keV, alpha = -1.44 (+0.07/-0.06) and beta = -2.32 (+0.19/-0.47). The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 10267 table
GRB_name GRB091208B
GCN_number 10267
Detection_method Swift-UVOT Other
ra 29.3920°
decl 16.8897°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10267 SUBJECT: GRB091208B: Swift/UVOT refined analysis DATE: 09/12/08 18:00:07 GMT FROM: Massimiliano de Pasquale at MSSL-UCL M. De Pasquale (MSSL/UCL) and C. Pagani (PSU) report on behalf of the Swift UVOT team. The Swift UltraViolet/Optical Telescope (UVOT) began settled observations of the GRB 091208B (Swift BAT trigger number 378559; Pagani et al. GCN Circ. 10256) 119 s after the BAT trigger with an exposure in the UVOT white filter. A new optical source is found at position RA, Dec = 29.39204, 16.88967, corresponding to RA (J2000) = 01 57 34.09 Dec (J2000) = +16 53 22.82 This is within 0.6 arseconds from the XRT enhanced position (Osborne et al., GCN Circ. 10259) and consistent with it. The detection is in all 3 filters UVOT used at early epoch. The initial magnitudes are given below. Filter Time(s) Mag Err wh 119-269 17.92 0.04 b 588-605 18.38 0.29 u 333-583 18.63 0.09 We caution that data analysis is slightly complicated by the presence of a dim source 3 arcsecond away from the afterglow. The values quoted above are on the UVOT Photometric System (Poole et al., 2008, MNRAS 383,627). They are not corrected for the expected Galactic extinction, corresponding to a reddening of E(B-V)=0.05.
GCN 10268 table
GRB_name GRB091208B
GCN_number 10268
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 10268 SUBJECT: GRB 091208B: Swift-XRT refined analysis DATE: 09/12/08 20:50:26 GMT FROM: Claudio Pagani at PSU/Swift-XRT C. Pagani (PSU) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: We have analysed 3.6 ks of XRT data for GRB 091208B (Pagani et al. GCN Circ. 10256), from 132 s to 12.2 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 10259). The light curve presents bumps and mini-flares and can be modelled with a power-law decay with a decay index of alpha=0.73 (+0.04, -0.05). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.32 (+0.18, -0.16). The best-fitting absorption column is 2.9 (+/-0.5) x 10^21 cm^-2, in excess of the Galactic value of 4.8 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (7.2 x 10^-11) erg cm^-2 count^-1. If the light curve continues to decay with a power-law decay index of 0.73, the count rate at T+24 hours will be 0.034 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.3 x 10^-12 (2.5 x 10^-12) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00378559. This circular is an official product of the Swift-XRT team.
GCN 10269 table
GRB_name GRB091208B
GCN_number 10269
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10269 SUBJECT: GRB091208B: NOT optical observations DATE: 09/12/08 22:10:36 GMT FROM: Dong Xu at DARK,NBI D. Xu (WIS, DARK/NBI), G. Leloudas, D. Malesani (DARK/NBI), P. Jakobsson (Univ. of Iceland), J. Lindberg, J. Andersen (NOT) report on behalf of a larger collaboration: We observed the field of GRB091208B (Pagani et al. GCN 10256; de Ugarte Postigo et al. GCN 10255) at the Nordic Optical Telescope equipped with ALFOSC. The 2x300s frames were obtained starting at 20:46:43 UT on Dec. 08th, 10.9878 hr after the burst trigger. The magnitude of the afterglow is R~20.9 with respect to stars in the USNO B1 catalog. Comparison with the measurement in Cano et al. (GCN 10262) indicates a general decay slope of ~0.6-~0.7 in the R band. [GCN OPS NOTE(22dec09): Per author's request, the date in the 2nd sentence was changed ""from Nov 28" to "Dec 8".]
GCN 10271 table
GRB_name GRB091208B
GCN_number 10271
Detection_method correction
Circular_text TITLE: GCN CIRCULAR NUMBER: 10271 SUBJECT: GRB 091208B: GROND observations DATE: 09/12/09 05:13:59 GMT FROM: Andrea Rossi at TLS Tautenburg Adria Updike (Clemson University), Andrea Rossi (Tautenburg Obs.) and Jochen Greiner (MPE Garching) report on behalf of the GROND team: We observed the field of GRB 091208B (Swift trigger 378559, Pagani et al., GCN #10256) 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). First observations started at 01:07 UT on Dec 09, 15h17m after the GRB trigger, for a total integration time of 7.7 min in g'r'i'z' and 8min in JHK. For the afterglow reported by Pagani et al. and de Ugarte Postigo et al. (GCN #10255) we estimate the following preliminary magnitudes (in the AB system): g' = 22.64 +- 0.15 r' = 21.88 +- 0.14 i' = 21.65 +- 0.17 z' = 21.35 +- 0.17 J = 20.61 +- 0.10 H = 20.5 +- 0.3 K analysis on going These magnitudes are in agreement with a afterglow at redshift z<3.5. After correction for the different filter and magnitude system, a comparison with other observation (Xu et al.,GCN #10269 and Cano et al., GCN #10262) confirms that the afterglow is decaying with the slope of 0.6-0.7 reported by Xu et al. . 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)=0.05 mag in the direction of the burst (Schlegel et al. 1998).
GCN 10272 table
GRB_name GRB091208B
GCN_number 10272
Detection_method Other
redshift 1.0633
Circular_text TITLE: GCN CIRCULAR NUMBER: 10272 SUBJECT: GRB 091208B: Keck HIRES redshift confirmation DATE: 09/12/09 06:11:31 GMT FROM: Daniel Perley at U.C. Berkeley D. A. Perley (UC Berkeley), J. X. Prochaska (UCSC), P. Kalas, A. Howard, M. Fitzgerald, G. Marcy, and J. Graham (UCB) report: Starting at 10:58:17 UT on December 8 we initiated a single 1200 second exposure of the afterglow of GRB 091208B (GCN 12055, de Ugarte Postigo et al.; GCN 10256, Pagani et al.) with HIRES-r on the 10m Keck I telescope. Consistent with the result of Wiersema et al. (GCN 10263), we detect absorption lines from MgII and MnII at a redshift of z=1.0633+/-0.0003. Additionally, we detect fine-structure transitions of FeII confirming that this is the redshift of the GRB.
GCN 10273 table
GRB_name GRB091208B
GCN_number 10273
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10273 SUBJECT: GRB 091208B: optical observations DATE: 09/12/09 12:32:39 GMT FROM: Alexei Pozanenko at IKI, Moscow M.Andreev, A.Sergeev, N.Parakhin, N.Karpov (Terskol Branch of Institute of Astronomy), Yu. Kuznietsova (Main Astronomical Observatory NASU), V.Petkov (Baksan Neutrino Observatory INR) and A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report: We observed the field of the Swift GRB 091208B (Pagani et al. GCN 10256) with the Z-600 telescope of Mt.Terskol observatory in R-filter on Dec. 08 starting at (UT) 15:40. In combined images we detect the optical afterglow (Ugarte Postigo et al. GCN 10255, Pagani et al. GCN 10256). Preliminary photometry is based on the USNO-B1.0 reference star #1069-0020318 assuming R2=17.47: UT Filter, Exposure, mag. err. (mid) (s) 16:10 R 30x120 20.15 0.25 18:11 R 30x120 20.60 0.25 19:11 R 30x120 20.9 0.3 20:19 R 30x120 21.0 0.3 Combined image can be found in http://grb.rssi.ru/GRB091208B/GRB091208B_Terskol600_R.jpg
GCN 10275 table
GRB_name GRB091208B
GCN_number 10275
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10275 SUBJECT: GRB 091208B: GAO 150cm telescope Optical Observation DATE: 09/12/10 08:51:42 GMT FROM: Kenzo Kinugasa at Gunma Astro. Obs/Japan K. Kinugasa, S. Honda, H. Takahashi, H. Taguchi, O. Hashimoto (Gunma Astronomical Observatory) report: The position of GRB 091208B (Pagani et al., GCN 10256) was observed with the 150 cm telescope of Gunma Astronomical Observatory. Starting at 10:21:09 UT on Dec.8 ( 0.52 hours after the trigger), both Rc and Ic frames were acquired for sets of 3 x 2-min and 5 x 5-min exposures. We detected the optical counterpart (e.g., de Ugarte Postigo et al., GCN 10255; Yoshida et al. GCN 10258) 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. ----------------------------------------------------- 10:50:45 0.01796 3x2min, 5x3min Rc=18.8+-0.1 11:07:20 0.02273 3x2min, 5x3min Ic=18.4+-0.1 ----------------------------------------------------- The R magnitude is consistent with the fading trend of a power-law slope of ~0.7 from the other optical observations (e.g. Cano et al. GCN 10262; Xu et al. GCN 10269; Nakajima et al. GCN 10260).
GCN 10279 table
GRB_name GRB091208B
GCN_number 10279
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10279 SUBJECT: GRB 091208B: Xinglong TNT optical observation DATE: 09/12/13 08:53:10 GMT FROM: L.P. Xin at NAOC L.P. Xin, S. B, Qian, Y.L. Qiu, J. Wang, J.Y. Wei, W. K. Zheng, J. S. Deng, and J. Y. Hu on behalf of EAFON report: We observed the optical afterglow of GRB 091208B (Pagani et al. GCN 10256) with Xinglong TNT telescope from Nov. 8th, 10:12:31.6(UT), 23 min after the burst. The optical counterpart was clearly detected in our images. The brightness was estimated to be about R~18.5 relative to the USNO-B1.0 R2 mag, at the meam time of 30 min after the burst. This message may be cited. for more information about Xinglong GRBs Follow-up observations, please visit the web-site http://www.xinglong-naoc.org/grb/