GRB100906A

This page lists all entries on GRB100906A in GRBweb

Summary Fermi GBM IPN Swift GCN 11227 GCN 11228 GCN 11229 GCN 11230 GCN 11231 GCN 11232 GCN 11233 GCN 11235 GCN 11238 GCN 11239 GCN 11240 GCN 11242 GCN 11243 GCN 11244 GCN 11245 GCN 11247 GCN 11248 GCN 11249 GCN 11250 GCN 11251 GCN 11252 GCN 11253 GCN 11254 GCN 11259 GCN 11267 GCN 11291 GCN 11340 GCN 11395

Summary table
Variable Value Source
GRB_name_Fermi GRB100906576
T0 13:49:27 UTC GCN_circulars,Swift Det
ra 28.6838° Swift
decl 55.6304° Swift
pos_error 7.90e-05° Swift
T90 110.594 s Fermi_GBM
T90_error 2.828 s Fermi_GBM
T90_start 13:49:28.398 UTC Fermi_GBM
fluence 2.33e-05 erg/cm² Fermi_GBM
fluence_error 5.79e-08 erg/cm² Fermi_GBM
redshift 1.7270 GCN_circulars,Other
T100 114.4 s
GBM_located False
mjd 55445.576006944444 GCN_circulars,Swift Det
Fermi GBM table
GRB_name_Fermi GRB100906576
trigger_name bn100906576
ra 28.6842°
decl 55.6306°
pos_error 2.53e+00°
datum 2010-09-06
t_trigger 13:49:27.630 UTC
T90 110.594 s
T90_error 2.828 s
T90_start 13:49:28.398 UTC
fluence 2.33e-05 erg/cm²
fluence_error 5.79e-08 erg/cm²
flux_1024 1.45e+01 erg/cm²/s
flux_1024_error 4.16e-01 erg/cm²/s
flux_1024_time 1.02e+01 erg/cm²/s
flux_64 1.94e+01 erg/cm²/s
flux_64_error 1.85e+00 erg/cm²/s
IPN table
GRB_name GRB100906A
ra 28.7083°
decl 55.6167°
pos_error 5.00e-02°
redshift 1.7270
Swift table
GRB_name GRB100906A
t_trigger 13:49:27 UTC
ra 28.6838°
decl 55.6304°
pos_error 7.90e-05°
T90 114.4 s
fluence 1.20e-05 erg/cm²
redshift 1.7270
GCN 11227 table
GRB_name GRB100906A
GCN_number 11227
Detection_method Swift Det
t_trigger 13:49:27 UTC
ra 28.7090°
decl 55.6140°
Circular_text TITLE: GCN CIRCULAR NUMBER: 11227 SUBJECT: GRB 100906A: Swift detection of a burst with an optical afterglow DATE: 10/09/06 14:07:13 GMT FROM: Scott Barthelmy at NASA/GSFC C. B. Markwardt (NASA/GSFC), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), V. D'Elia (ASDC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), O. Godet (U Leicester), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), W.B Landsman (GSFC), O. M. Littlejohns (U Leicester), F. E. Marshall (NASA/GSFC), D. C. Morris (GWU/GSFC), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), B. Sbarufatti (INAF-OAB/IASFPA), M. H. Siegel (PSU), R. L. C. Starling (U Leicester) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 13:49:27 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100906A (trigger=433509). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 28.709, +55.614, which is RA(J2000) = 01h 54m 50s Dec(J2000) = +55d 36' 50" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows multiple bright peaks with a duration of about 130 sec. The peak count rate was ~11000 counts/sec (15-350 keV), at ~10 sec after the trigger. The XRT began observing the field at 13:50:47.6 UT, 80.2 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 28.68305, 55.62985 which is equivalent to: RA(J2000) = 01h 54m 43.93s Dec(J2000) = +55d 37' 47.5" with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 78 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 (2.21 x 10^21 cm^-2, Kalberla et al. 2005), with an excess column of 2.6 (+2.21/-1.90) x 10^21 cm^-2 (90% confidence). The initial flux in the 0.1 s image was 2.34e-08 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 250 seconds with the U filter starting 146 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 01:54:44.11 = 28.68380 DEC(J2000) = +55:37:49.6 = 55.63045 with a 90%-confidence error radius of about 0.61 arc sec. This position is 1.6 arc sec. from the center of the XRT error circle. The estimated magnitude is 14.90 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.36. A bright XRT flare at ~120 s corresponds to the last peak in the prompt emission. The UVOT bright source is probably also associated in time with the flare. More information to follow. Burst Advocate for this burst is C. B. Markwardt (Craig.Markwardt 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 11228 table
GRB_name GRB100906A
GCN_number 11228
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 11228 SUBJECT: GRB 100906A: MASTER early OT observations DATE: 10/09/06 14:12:54 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka Two MASTER robotic telescopes (MASTER-Net: http://observ.pereplet.ru) located near Baykal Lake (Tunka) and Blagoveschensk was pointed to the Swift GRB 100906A (Markwardt et al., GCN CIRCULAR 11227) 23 sec after Notice time (38 s after trigger time) and 43 s after Notice time (58s after trigger time). We have a number polarization, unfiltered images with exposition 10, 20, 30, 40, 60... s. We see bright OT at Swift Uvot position (Markwardt et al., GCN CIRCULAR 11227). The message may be cited. mailto: lipunov@sai.msu.ru
GCN 11229 table
GRB_name GRB100906A
GCN_number 11229
Detection_method Optical
ra 28.6837°
decl 55.6304°
Circular_text TITLE: GCN CIRCULAR NUMBER: 11229 SUBJECT: GRB 100906A : Faulkes Telescope North optical observations DATE: 10/09/06 14:30:42 GMT FROM: Andrea Melandri at Liverpool John Moores U A. Melandri (INAF-OAB), D. Kopac (U. Ljubljana) and Z. Cano (LJMU) report on behalf of a large collaboration: The Faulkes Telescope North automatically began observing Swift GRB 100906A (trigger = 433509, Markwardt et al., GCN 11227) on September 06,13:53:03 UT, about 3.5 minutes from the GRB trigger time. We clearly identify an uncatalogued object at the following position: RA(J2000): 01:54:44.09 Dec(J2000): +55:37:49.5 The position is consistent with UVOT candidate and the object is clearly fading. Preliminary photometry gives a magnitude of R=15.5 +/- 0.1 @800 s after the burst event. Observations are going on.
GCN 11230 table
GRB_name GRB100906A
GCN_number 11230
Detection_method Other
redshift 1.7270
Circular_text TITLE: GCN CIRCULAR NUMBER: 11230 SUBJECT: GRB 100906A: Gemini-N/GMOS redshift DATE: 10/09/06 15:15:39 GMT FROM: Nial Tanvir at U.Leicester N. R. Tanvir, K. Wiersema (U. Leicester) and A. J. Levan (U. Warwick) report on behalf of a larger collaboration: We observed the location of GRB 100906A (Markwardt et al. GCN 11227; Ivanov et al. GCN 11228; Melandri et al. GCN 11229) with the Gemini-North Telescope on Mauna Kea using the GMOS spectrograph. Observations began at 14:30 UT, approximately 40 minutes post burst. We detect strong continuum from the afterglow, and identify numerous absorption lines, including CIV (1458, 1551A), FeII (2344, 2374, 2383A) at a common redshift of z=1.727. Further analysis is ongoing. We acknowledge the support of Chad Trujillo in obtaining these observations.
GCN 11231 table
GRB_name GRB100906A
GCN_number 11231
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 11231 SUBJECT: GRB 100906A: MASTER preliminary polarization prompt light curve DATE: 10/09/06 15:23:17 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov Sternberg Astronomical Institute, Moscow State University K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory Two MASTER robotic telescopes (MASTER-Net: http://observ.pereplet.ru) located near Baykal Lake (Tunka) and Blagoveschensk was pointed to the Swift GRB 100906A (Markwardt et al., GCN CIRCULAR 11227) 23 sec after Notice time (38 s after trigger time) and 43 s after Notice time (58s after trigger time) (Ivanov et al., GCN CIRCULAR 11228). We see brightening and decay of the prompt optical emission in both polarizations. The preliminary light curve is available at http://observ.pereplet.ru/images/GRB100906A/pre_lc.gif This automatical phtometry calbrated by USNOB1 stars. The message may be cited. mailto: lipunov@sai.msu.ru
GCN 11232 table
GRB_name GRB100906A
GCN_number 11232
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 11232 SUBJECT: GRB 100906A: UKIRT zYJHK Observation DATE: 10/09/06 15:27:40 GMT FROM: Myungshin Im at Seoul Nat U Myungshin Im, Changsu Choi, Hyunsung Jun, Eugene Kang (CEOU/Seoul National University), Y. Urata (NCU), P. Choi (Pomona College), T. Sakamoto (NASA/GSFC), and N. Gehrels (NASA/GSFC) on behalf of a larger collaboration Using UKIRT, we obtained multiple sets of zYJHK images of GRB 100906A (Markwardt et al. GCN 11227) with a series of z, Y, J, H, and K filters using UKIRT. The observation started at Sept. 06, 14:23 UT or roughly 34 minutes after the BAT alert. We clearly identify an uncatalogued source in images in all the filters. The preliminary magnitude of the afterglow is J= 14.93 +- 0.02 and K=13.54 +- 0.02 (Vega), calibrated against 2MASS stars in the vicinity.
GCN 11233 table
GRB_name GRB100906A
GCN_number 11233
Detection_method Swift-BAT Det
ra 28.6970°
decl 55.6340°
Circular_text TITLE: GCN CIRCULAR NUMBER: 11233 SUBJECT: GRB 100906A: Swift-BAT refined analysis DATE: 10/09/06 16:31:20 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 100906A (trigger #433509) (Markwardt, et al., GCN Circ. 11227). The BAT ground-calculated position is RA, Dec = 28.697, 55.634 deg, which is RA(J2000) = 01h 54m 47.4s Dec(J2000) = +55d 38' 03.7" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 46%. The mask-weighted light curve shows several bright peaks. The first pair of overlapping peaks starts at ~T-0.2 sec, peaks at ~T+2 and ~T+10 sec, and almost returns to background at ~T+35 sec. There is a small peak at ~T+50 sec. Then there are four overlapping peaks from ~T+100 to ~T+118 sec. T90 (15-350 keV) is 114.4 +- 1.6 sec (estimated error including systematics). The time-averaged spectrum from T-0.2 to T+130.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.78 +- 0.03. The fluence in the 15-150 keV band is 1.2 +- 0.0 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T+10.48 sec in the 15-150 keV band is 10.1 +- 0.4 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/433509/BA/
GCN 11235 table
GRB_name GRB100906A
GCN_number 11235
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 11235 SUBJECT: GRB 100906A: MASTER preliminary prompt+afterglow lc DATE: 10/09/06 18:13:03 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs D.Kuvshinov, V.Kornilov, E. Gorbovskoy, V. Lipunov, A.Belinski, N.Shatskiy, N.Tyurina, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, A.Sankovich Sternberg Astronomical Institute, Moscow State University K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory Observations on MASTER robotic telescope at Tunka (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, pp. 1-7) are continued (Ivanov et al., GCN CIRCULAR 11228, Gorbovskoy et al., GCN CIRCULAR 11231). We have very smoth light curve up to 4 hours after trigger time. The power low index afterglow decay (F~T_alpha) apha is equal -0.83+-0.02 . The preliminary 20 min automatical light curve is available at http://observ.pereplet.ru/images/GRB100906A/lc_GRB100906A_30min.png (unfiltered). This automatical pohtometry calibrated by USNOB1 stars. The message may be cited. mailto: lipunov@sai.msu.ru
GCN 11238 table
GRB_name GRB100906A
GCN_number 11238
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 11238 SUBJECT: GRB 100906A: TLS Multicolor Observations DATE: 10/09/06 20:39:03 GMT FROM: Alexander Kann at TLS Tautenburg D. A. Kann, A. Nicuesa Guelbenzu, F. Ludwig and B. Stecklum (TLS Tautenburg) report: We observed the afterglow of the bright Swift GRB 100906A (Markwardt et al., GCN 11227) with the 1.34m TLS Schmidt telescope as soon as dusk set in. We obtained 3 x 300 sec images in Z, Ic, Rc, V and B each. The afterglow is clearly detected in all images. Assuming the star at RA = 01:54:46.82, Dec. = +55:37:55.3 to have USNOB1.0 R2 = 15.70, we find the following magnitude for the afterglow: Rc = 18.84 +/- 0.03 at 0.247478 days after the GRB. Further observations are planned if weather permits. This message may be cited.
GCN 11239 table
GRB_name GRB100906A
GCN_number 11239
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 11239 SUBJECT: GRB 100906A: Ondrejov 65cm observations DATE: 10/09/06 21:41:29 GMT FROM: Petr Kubanek at AIO Kamil Hornoch, Peter Kusnirak, Barbora Mikulecka, Petra Hornochova, Petr Scheirich, Tomas Kusnirak and Jan Strobl (Astronomical Institute, Czech Republic) and Petr Kubanek (IPL UV Valencia, IAA CSIC Granada) reports on behalf of larger collaboration: We observed position of GRB100906A with Ondrejov 65cm telescope. Its optical counterpart (Markwardt et al., GCN 11227) is well detected on stacked 6x180 second R band exposure with mid-point at 2010-09-06 19:51:14 UT, with preliminary magnitude 19.5 +- 0.5 mag. Further observations and calibrations with this as well as other instruments are ongoing.
GCN 11240 table
GRB_name GRB100906A
GCN_number 11240
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 11240 SUBJECT: GRB100906A: MITSuME Okayama Optical Observation DATE: 10/09/07 00:06:52 GMT FROM: Daisuke Kuroda at OAO/NAOJ D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 100906A (Markwardt et al., GCN 11227) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory. The observation started on 2010-09-06 13:53:54 UT (~4.4 min after the burst). We detected the previously reported afterglow (Markwardt et al., GCN 11227; Ivanov et al., GCN 11228; Melandri et al., GCN 12229) in all the three bands. Photometric results of the OT are listed below. We used GSC2.3 catalog for flux calibration. #T0+[day] MID-UT T-EXP[sec] g' g'_err Rc Rc_err Ic Ic_err ---------------------------------------------------------------------- 0.00662 13:58:60 540.0 15.58 0.04 14.42 0.02 14.00 0.02 0.01784 14:15:09 540.0 16.52 0.05 15.35 0.03 14.98 0.04 ---------------------------------------------------------------------- T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]
GCN 11242 table
GRB_name GRB100906A
GCN_number 11242
Detection_method Swift-UVOT Det
redshift 1.7270
Circular_text TITLE: GCN CIRCULAR NUMBER: 11242 SUBJECT: GRB 100906A: Swift/UVOT Observations DATE: 10/09/07 02:33:56 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU) and C. B. Markwardt (NASA/GSGC) report on behalf of the Swift/UVOT team. The Swift/UVOT began settled observations of the field of GRB 100906A 89s after the BAT trigger (Markwardt et al., GCN Circ. 11227). Data summed from the first orbit confirms a fading optical transient at the position report by Markwardt et al. The non-detection in the UVW2 and UVM2 filters is consistent with the Gemini redshift of 1.727 reported by Tanvir et al. (GCN Circ. 11230). Observations of the GRB are continuing. The magnitudes and 3-sigma upper limits for the finding chart (fc) and summed exposures are reported below: FILTER T_start(s) T_stop Exposure Mag/3UL ======================================================== u (fc) 146 396 245 14.93+-0.02 u 146 1305 490 15.40+-0.01 v 453 1381 116 15.97+-0.05 b 403 1330 116 16.49+-0.04 uvw1 503 1280 97 17.13+-0.11 uvm2 478 1404 115 >18.97 uvw2 429 1356 116 >19.19 ======================================================= The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 0.36 (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 11243 table
GRB_name GRB100906A
GCN_number 11243
Detection_method Swift-XRT Det
ra 28.6840°
decl 55.6307°
Circular_text TITLE: GCN CIRCULAR NUMBER: 11243 SUBJECT: GRB 100906A: Enhanced Swift-XRT position DATE: 10/09/07 03:20:48 GMT FROM: Phil Evans at U of Leicester M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using 5488 s of XRT Photon Counting mode data and 7 UVOT images for GRB 100906A, 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 = 28.68397, +55.63068 which is equivalent to: RA (J2000): 01h 54m 44.15s Dec (J2000): +55d 37' 50.5" with an uncertainty of 1.4 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 11244 table
GRB_name GRB100906A
GCN_number 11244
Detection_method Swift-XRT Other
redshift 1.7270
Circular_text TITLE: GCN CIRCULAR NUMBER: 11244 SUBJECT: GRB 100906A: Swift-XRT refined analysis DATE: 10/09/07 03:58:18 GMT FROM: Andy Beardmore at U Leicester A. P. Beardmore (U. Leicester) and C. B. Markwardt (NASA/GSFC) report on behalf of the Swift-XRT team: We have analysed 16.6 ks of XRT data for GRB 100906A (Markwardt et al. GCN Circ. 11227), from 70 s to 40.2 ks after the BAT trigger. The data comprise 228 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 Goad et al. (GCN. Circ 11243). The X-ray light curve initially shows a large flare, peaking at a count rate of ~2000 count s^-1 at T+120s, contemporary with the late time BAT activity (Barthelmy et al., GCN Circ. 11233). It then declines rapidly before breaking to a shallower decay slope of alpha = 0.74 +/- 0.04 after T+270s. This is followed by a further break at T+10854 s to an slope of 1.96 +0.17 -0.13. A spectrum formed from the PC mode data can be fit by an absorbed power-law with a photon index of 2.15 +/-0.08. The best-fitting absorption column is (8.1 +/- 2.5) x 10^21 cm^-2, at a redshift of 1.727 (Tanvir et al. GCN Circ. 11230), in addition to the Galactic value of 2.2 x 10^21 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.1 x 10^-11 (7.1 x 10^-11) erg cm^-2 count^-1. We do not report a WT time averaged spectral fit here as this would be affected by the spectral evolution during the flaring activity, evident in the hardness ratio. If the light curve continues to decay at the same rate, the count rate at T+24 hours will be 5.9 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.4 x 10^-13 (4.2 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00433509. This circular is an official product of the Swift-XRT team.
GCN 11245 table
GRB_name GRB100906A
GCN_number 11245
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 11245 SUBJECT: GRB 100906A: Observations at the Virtual Telescope DATE: 10/09/07 04:25:33 GMT FROM: Gianluca Masi at Bellatrix Astronomical Obs G. Masi (Bellatrix Astronomical Observatory, Italy) reports: The Virtual Telescope main instrument (0.36m-f/8.7) observed this GRB afterglow on Sept. 7, 2010 at 03:35 Universal Time. Unfiltered photometry, using R mags from USN0 B1.0 for the reference stars, provided a magnitude of 19.5, while the astrometry provided the following end figures: RA: 44.10s Decl.: 49.5" (J2000) in excellent agreement with UVOT finding (GCN 11227) This message can be cited.
GCN 11247 table
GRB_name GRB100906A
GCN_number 11247
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 11247 SUBJECT: GRB 100906A: TLS Monitoring DATE: 10/09/07 05:33:46 GMT FROM: Alexander Kann at TLS Tautenburg D. A. Kann, A. Nicuesa Guelbenzu, F. Ludwig and B. Stecklum (TLS Tautenburg) report: Further to Kann et al. (GCN 11238), we continued monitoring the afterglow of GRB 100906A (Markwardt et al., GCN 11227) with the 1.34m TLS Schmidt telescope under excellent conditions in intermittent intervals all night. Beyond the 15 detections reported in Kann et al. (GCN 11238), we obtained further nine Rc images (300 sec each) spread over the night, as well as one further Ic (300 sec) and one further Z (600 sec) image at the end of the night, during morning twilight. The afterglow is clearly detected in all our images. Due to crowding, we use SExtractor under GAIA to subtract background mesh maps, then perform aperature photometry without needing to measure the surrounding sky background (which is around 0). Errors are estimates based on how clear the detection is, the last Rc frame was taken in strong twilight already. We assume R2 = 15.9 for the USNOB1.0 star at RA = 01:54:55.247, Dec. = +55:38:31.40, and measure: Midtime Rc dRc 0.247478 18.97 0.05 0.251517 19.06 0.05 0.255556 19.04 0.05 0.390570 19.08 0.05 0.430154 19.27 0.05 0.451022 19.18 0.05 0.498974 19.64 0.05 0.521231 19.62 0.05 0.525421 19.67 0.05 0.554113 19.80 0.05 0.570108 19.97 0.15 The afterglow seems to transition from a plateau phase (0.25 - 0.4 days) to a much steeper decay. Further observations are improbable due to upcoming inclement weather. This message may be cited.
GCN 11248 table
GRB_name GRB100906A
GCN_number 11248
Detection_method Fermi GBM Det
t_trigger 13:49:27.630 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 11248 SUBJECT: GRB 100906A: Fermi GBM observation DATE: 10/09/07 07:13:10 GMT FROM: David Gruber at MPE David Gruber (MPE) reports on behalf of the Fermi GBM Team: "At 13:49:27.63 UT on 06 September 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 100906A (trigger 305473769 / 100906576) which was also detected by the Swift-BAT (Markwardt et al. 2010, GCN 11227) The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 95 degrees. The GBM light curve shows several bright peaks with a duration (T90) of about 105 s (50-300 keV). The time-averaged spectrum from T0 to T0+122 s is best fit by a Band function with Epeak = 106.0 +17.5/-20.2 keV, alpha = -1.34 +0.08/-0.06, and beta = -1.98 +0.06/-0.07. (Castor C-stat 1044 for 479 d.o.f.) The event fluence (10-1000 keV) in this time interval is (2.64E-05 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+10.1 s in the 10-1000 keV band is 14.45 +/- 0.29 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 11249 table
GRB_name GRB100906A
GCN_number 11249
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 11249 SUBJECT: GRB100906A: Optical observations at IAO DATE: 10/09/07 08:42:23 GMT FROM: Daisuke Kuroda at OAO/NAOJ D. Kuroda (OAO, NAOJ), H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ), K. Yanagisawa (OAO, NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 100906A (Markwardt et al., GCN 11227) with the optical three color (g', Rc and Ic) CCD camera attached to the Murikabushi 1m telescope of Ishigakijima Astronomical Observatory. The observation started on 2010-09-06 17:20:53 UT (~3.5 h after the burst). We detected the previously reported afterglow (Markwardt et al., GCN 11227; Ivanov et al., GCN 11228; Melandri et al., GCN 12229) in all the three bands. Photometric results of the OT are listed below. We used GSC2.3 catalog for flux calibration. #T0+[day] MID-UT T-EXP[sec] g' g'_err Rc Rc_err Ic Ic_err ---------------------------------------------------------------------- 0.15249 17:29:02 840.0 19.3 0.1 18.3 0.1 17.6 0.1 ---------------------------------------------------------------------- T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]
GCN 11250 table
GRB_name GRB100906A
GCN_number 11250
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 11250 SUBJECT: GRB100906A: non-detection at 15GHz DATE: 10/09/07 10:08:45 GMT FROM: Guy Pooley at MRAO, Cambridge, UK The AMI Large Array (Cambridge, UK) was used to observe the field of GRB 100906A (Markwardt et al, GCN11227) in the band 13.5 to 17.2 GHz from 2010 Sep 06 23h31m to Sept 07 03h35m (starting 9h42m after the trigger). The weather conditions were very poor and the noise levels consequently high; no detection of GRB 100906A was made, with a formal flux density at the UVOT position from GCN11227 of 380 microJy and an rms noise of 136 microJy. This message is quotable in publications. Guy Pooley, on behalf of the AMI collaboration
GCN 11251 table
GRB_name GRB100906A
GCN_number 11251
Detection_method Konus-Wind Det
t_trigger 13:49:30.732 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 11251 SUBJECT: Konus-Wind observation of GRB 100906A DATE: 10/09/07 10:27:34 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 100906A, (Swift/BAT trigger=433509: Markwardt et.al, GCN 11227; Barthelmy et.al, GCN 11233) triggered Konus-Wind at T0=49770.732s UT (13:49:30.732) The burst light curve started with a complex ~20s-long structure, followed by a weaker softer emission episode starting at ~T0+100 s. The total duration of the burst is ~150 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/GRB100906_T49770/ As observed by Konus-Wind the burst had a fluence of (2.6 0.4)x10-5 erg/cm2, and a 256-ms peak flux, measured from T0+9.728s, of (2.7 0.3)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+139.264 s) is best fit in the 20 keV - 2 MeV range by the GRB (Band) model, for which: the low-energy photon index alpha = -1.5 (-0.2, +0.4), the high energy photon index beta = -2.3 (<-2.0), the peak energy Ep = 142(-60, +119) keV (chi2 = 84/60 dof). The spectrum of the most intense part of the burst (measured from T0+0.256 to T0+16.384 s) is best fit in the 20 keV - 2 MeV range by the GRB (Band) model, for which: the low-energy photon index alpha = -1.1 (-0.1, +0.1), the high energy photon index beta = -2.2 (-0.3, +0.2), the peak energy Ep = 180(-40, +45) keV (chi2 = 68/60 dof). The spectrum of the second bursting episode (measured from T0+98.304 to T0+122.880 s) is best fit in the 20 keV - 2 MeV range by the simple power law model with the photon index = 2.55 (-0.2, +0.25), chi2 = 63/62 dof. Assuming z=1.727 (Tanvir, Wiersema, and Levan et al., GCN 11230) 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 = (2.2 0.4)x1053 erg, the peak luminosity (L_iso)_max = (5.7 0.6)x1052 erg/s. All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.
GCN 11252 table
GRB_name GRB100906A
GCN_number 11252
Detection_method Swift Other
ra 28.6838°
decl 55.6304°
Circular_text TITLE: GCN CIRCULAR NUMBER: 11252 SUBJECT: GRB100906A: R band observations DATE: 10/09/07 15:55:11 GMT FROM: Janos Kelemen at Konkoly Obs/Hungary J. Kelemen and K. Sarneczky (Konkoly Observatory) Z. Kuli and B. Ujhelyi (Hungarian Astronomical Association) on behalf of the GRB OT observing program at the Konkoly Observatory. On 09 september 2010 02:25:57 UT (45390 s after the burst) we observed the field of GRB 100906A detected by Swift (trigger=433509; Markwardt et al., GCN 11227) with a 60/90 cm Schmidt telescope located at the Mountain Station of the Konkoly Observatory using R filter. The exposure time of the CCD images were 300 s. We clearly detected the fading afterglow at RA(J2000) = 01h 54m 44.12s Dec(J2000) = +55d 37' 49.3" (astrometry with ASTROMETRICA using UCAC3 catalogue.) with an uncertainty of 0.2 arcseconds. Time Mag Error. Flag. [s] [R] [1-sigma] ------------------------------------- 45390 20.6 0.1 - 45709 20.7 0.1 - 46028 21.3 0.1 - ------------------------------------- The above magnitudes have not been corrected for the Galactic extinction.
GCN 11253 table
GRB_name GRB100906A
GCN_number 11253
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 11253 SUBJECT: GRB 100906A: GRAS-007 optical observations DATE: 10/09/07 17:19:18 GMT FROM: Veli-Pekka Hentunen at Taurus Hill Obs,A95 Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill Observatory, Varkaus, Finland) report: GRAS-007 PlaneWave CDK 17" F6.8 telescope and STL-11000M CCD camera (Global-Rent-a-Scope, Nerpio, Spain) were used to detect GRB 100906A optical afterglow. The observations were started at 2010-09-07 02:13:24 (UT) and stopped at 2010-09-07 03:40:53 (UT). A number of unfiltered images with 120 sec and 600 sec exposure time were made. The afterglow was detected at following position RA 01 54 44.12 and DEC +55 37 49.4 consistent those given by Melandri A. et al. (GCN 11229) to within positional errors. The following magnitude was obtained from the observations using USNO-B1.0 1456-0062169 (R = 15.70) as the comparison: +T0 (hour) Filter Exp (sec) Mag Mag err Limit 13:00:24 (midpoint) unfiltered 3x600s 19.8 0.4 21.0 A JPG image of the 3x600 sec observations is available at the following URL: http://cutenews.kassiopeia.net/data/upimages/GRB100906A.jpg
GCN 11254 table
GRB_name GRB100906A
GCN_number 11254
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 11254 SUBJECT: GRB 100906A: RTT150 optical observations DATE: 10/09/07 18:30:39 GMT FROM: Rodion Burenin at IKI, Moscow A. Tkachenko (IKI), I. Khamitov (TUG), R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), I. Bikmaev, N. Sakhibullin (KSU/AST), Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.) The optical counterpart of GRB 100906A (GCN 11227) was observed with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), starting at Sep 06, 19:28 UT, i.e. ~5.64 hours after the burst, using TFOSC. Three series of BRI frames were made under moderate weather conditions. The afterglow is clearly detected in all images. Assuming the star at RA = 01:54:46.82, Dec. = +55:37:55.3 to have USNOB1.0 R2MAG = 15.70, we estimated the following magnitudes for the OT on combined images of every set: t-t0 band mag err 6.048 h R 18.80 0.02 9.610 h R 19.08 0.02 13.554 h R 19.69 0.04 The color of the afterglow changes from (B-R)=1.21 to (B-R)=1.31 at the beniginning and at the end of our observations.
GCN 11259 table
GRB_name GRB100906A
GCN_number 11259
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 11259 SUBJECT: GRB100906A: detection at 15GHz DATE: 10/09/09 10:16:04 GMT FROM: Guy Pooley at MRAO, Cambridge, UK The AMI Large Array (Cambridge, UK) was used to make two further observations of the field of GRB 100906A (Markwardt et al, GCN11227) in the band 13.5 to 17.2 GHz (GCN11250 reports the first observation). date/time flux sigma / microJy 2010 Sep 08 06h51m to Sep 08 07h51m 137 140 2010 Sep 08 22h03m to Sep 09 00h18m 465 70 The GRB is clearly detected in the second of these observations, mean time 57h17m after the trigger. (A radio source catalogued in NVSS, 87GB, 7C is also visible in the field near 01 55 11 +55 35 20 (J2000), about 4.5 arcmin from the GRB.) This message is quotable in publications. Guy Pooley, on behalf of the AMI collaboration
GCN 11267 table
GRB_name GRB100906A
GCN_number 11267
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 11267 SUBJECT: GRB 100906A: optical observations at Mt.Terskol DATE: 10/09/10 02:44:31 GMT FROM: Alexei Pozanenko at IKI, Moscow M. Andreev, A. Sergeev (Terskol Branch of Institute of Astronomy), A.Pozanenko (IKI), N. Parakhin, S. Velichko, N. Borachok (IC AMER) V. Petkov (Baksan Neutrino Observatory INR RAS) on behalf of larger GRB follow up collaboration report: We observed the field of Swift GRB 100906A (Markwardt et al., GCN 11227) with Zeiss-2000 telescope of Mt.Terskol observatory starting Sep. 06 (UT) 23:56. We obtained images in g,V, r filters. The afterglow (Markwardt et al. GCN 11227, Ivanov et al. GCN 11228, Melandri et al. GCN 11229) is clealy detected in all filters. The preliminary photometry is based on GSC2.3 catalog and Jordi et al. (2006) UBVRcIc -> ugriz transformations: T0+ Filter, Exp. OT (d) 0.4213 r 6x120 19.43 +/-0.03 0.4626 g 10x120 20.11 +/-0.02 0.4785 V 7x120 19.77 +/-0.03
GCN 11291 table
GRB_name GRB100906A
GCN_number 11291
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 11291 SUBJECT: GRB100906A: Ashra-1 observation of early optical emission DATE: 10/09/19 07:17:24 GMT FROM: Makoto Sasaki at ICRR/U.Tokyo Y.Asaoka, S.Hirai, T.Itoh, M.Masuda, Y.Morimoto, K.Ota, M.Sasaki (ICRR,Univ.Tokyo), D.Kogure, S.Ogawa, H.Tsujikawa (Toho Univ.), P.Binder (Univ.Hawaii Hilo), J.Learned (Univ.Hawaii Manoa) report on behalf of the Ashra-1 collaboration: We have searched for optical emission in the field of GRB100906A (Markwardt, et al., GCN Circ. 11227) around the BAT-triggered GRB time (T0) with one of the light collector units in the Ashra-1 detector (http://www.icrr.u-tokyo.ac.jp/~ashra) on Mauna Loa on Hawaii Island (latitude = 19.5412 deg. N, longitude =155.5676 deg. W, altitude =3330m). The Ashra-1 light collector unit has the achieved resolution of a few arcmin, viewing 42 degree circle region of which center is located at Alt = 60 deg, Azi = 0 deg. The sensitive region of wavelength is similar to the B-band. We quickly analyzed 200 images covering the field of GRB100906A every 6s with 4s exposure time respectively during the observation between T0-600s and T0+600s. We detected no new optical object within the PSF resolution around the GRB100906A determined by Swift-UVOT (Markwardt, et al., GCN Circ. 11227) As a result of our preliminary analysis, the following 3-sigma limiting magnitudes are derived: ---------------------------------------------------------------------- Starting&Ending Exp.Time, 3-sigma Limit. Mag. ---------------------------------------------------------------------- -593.2 -589.2 12.1 -587.3 -583.3 12.2 . . . . . . -1.4 2.6 12.0 4.5 8.5 12.1 . . . . . . 590.5 594.5 12.2 596.4 600.4 12.1 ---------------------------------------------------------------------- The limiting magnitudes were estimated in comparison with stars in Tycho-2 Catalog to be distributed between 12.0 and 12.2 as above partly listed. Figures of limiting optical magnitudes vs time comparing with other measurements and can be found at: http://www.icrr.u-tokyo.ac.jp/~ashra/GRB100906A. This message may be cited. ==================================== SASAKI Makoto ICRR, University of Tokyo 5-1-5 Kashiwa-no-ha Kashiwa 277-8582 tel/fax +81-4-7136-3143 ====================================
GCN 11340 table
GRB_name GRB100906A
GCN_number 11340
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 11340 SUBJECT: GRB 100906A: D50 optical detection DATE: 10/10/13 16:00:35 GMT FROM: Jan Strobl at AI AS CR,Ondrejov Jan Strobl (1,2), Martin Blazek (1,2), Martin Jelinek (3), Cyril Polasek (1), Petr Kubanek (3,4), Martin Nekola (1), Matus Kocka (1) and Rene Hudec (1,2) (1. ASU AVCR Ondrejov, 2. FEL CVUT Praha, 3. IAA Granada, 4. IPL UV Valencia) We report on the observation of the Swift GRB 100906A (Markwardt et al., GCN 11227) with the 0.5m telescope D50 in Ondrejov (Czech Republic), starting at 21:17:37 UT, i.e. ~7.5h after the trigger. Eventually, six hours of observational data were obtained, with the last image taken at 3:23:20 UT. We clearly detect the afterglow reported by Ivanov et al. (GCN 11228), and at the the beginning of our sequence (coadded first 7x 20s, exp. mean time = 21:19 UT) we measure a magnitude 18.7 +- 0.2. This message can be cited.
GCN 11395 table
GRB_name GRB100906A
GCN_number 11395
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 11395 SUBJECT: GRB 100906A: optical observations DATE: 10/11/11 17:56:47 GMT FROM: Alina Volnova at SAI MSU A. Volnova (SAI MSU), A. Pozanenko (IKI), M. Andreev, A. Sergeev (Terskol Branch of Institute of Astronomy), V. Rumyantsev, K. Grankin (CrAO), A. Erofeeva, G. Kornienko (UAFO), I. Molotov (ISON), E. Klunko (ISTPM), Ibrahimov (MAO), B. Satovski (Astrotel) on behalf of GRB follow up collaboration report: We observed the optical afterglow (Markwardt et al. GCN 11227, Ivanov et al. GCN 1128) of GRB 100906A (Markwardt et al. GCN 11227) with the following telescopes: GAS-250 (Ussuriysk Astrophysical Observatory), AZT-14 (Mondy observatory), Zeiss-2000 and Zeiss-600 (Mt.Terskol observatory), Shajn telescope (CrAO) and AZT-22 (Maidanak observatory). Observations started at 14:02 UT, i.e. approximately 13 minutes after the burst trigger. Observations in different optical bands (B, V, R, I, g, r) cover the period of t-t_0 from 0.12 up to 2.46 days. The photometry calibration was made against several stars of GSC2.3 catalog. The light curve of GRB 100906A afterglow can be found at http://grb.rssi.ru/GRB100906A/GRB100906A_lc.png . From the R band of light curve one can see a clear break around ~0.5 days after the burst with alpha_1 = -0.7 +/- 0.1 before and alpha_2 = -2.0 +/- 0.3 after break. Color index B-R measured between 0.22 and 0.24 days after the burst does not change within the error bars and is equal to 1.33 +/- 0.12, while the B-R index measured at 1.26 days after the burst trigger is equal to 1.61+/- 0.19.