GRB091029A

This page lists all entries on GRB091029A in GRBweb

Summary IPN Swift GCN 10097 GCN 10098 GCN 10099 GCN 10100 GCN 10102 GCN 10103 GCN 10104 GCN 10106 GCN 10107 GCN 10108 GCN 10111 GCN 10137

Summary table
Variable Value Source
T0 3:53:22 UTC GCN_circulars,Swift Det
ra 60.1775° Swift
decl -55.9556° Swift
pos_error 7.12e-05° Swift
T90 39.2 s Swift
T90_start 3:53:22 UTC Swift
fluence 2.40e-06 erg/cm² Swift
redshift 2.7520
T100 39.2 s
GBM_located False
mjd 55133.16206018518 GCN_circulars,Swift Det
IPN table
GRB_name GRB091029A
ra 60.1833°
decl -56.0000°
pos_error 5.00e-02°
redshift 2.7520
Swift table
GRB_name GRB091029A
t_trigger 3:53:22 UTC
ra 60.1775°
decl -55.9556°
pos_error 7.12e-05°
T90 39.2 s
fluence 2.40e-06 erg/cm²
redshift 2.7520
GCN 10097 table
GRB_name GRB091029A
GCN_number 10097
Detection_method Swift Det
t_trigger 3:53:22 UTC
ra 60.1830°
decl -55.9940°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10097 SUBJECT: GRB 091029: Swift detection of a burst with an optical counterpart DATE: 09/10/29 04:05:12 GMT FROM: David Palmer at LANL D. Grupe (PSU), J. R. Cummings (NASA/UMBC), F. E. Marshall (NASA/GSFC), C. Pagani (PSU), D. M. Palmer (LANL), M. H. Siegel (PSU), M. Stamatikos (OSU/NASA/GSFC), T. N. Ukwatta (GSFC/GWU) and L. Vetere (PSU) report on behalf of the Swift Team: At 03:53:22 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 091029 (trigger=374210). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 60.183, -55.994 which is RA(J2000) = 04h 00m 44s Dec(J2000) = -55d 59' 37" 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 50 sec. The peak count rate was ~3000 counts/sec (15-350 keV), at ~18 sec after the trigger. The XRT began observing the field at 03:54:41.9 UT, 79.3 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 60.17774, -55.95574 which is equivalent to: RA(J2000) = 04h 00m 42.66s Dec(J2000) = -55d 57' 20.7" with an uncertainty of 4.4 arcseconds (radius, 90% containment). This location is 138 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 consistent with the Galactic value of 1.14e+20 cm^-2 (Kalberla et al. 2005). The initial flux in the 2.5 s image was 1.80e-09 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 150 seconds with the White filter starting 90 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 04:00:42.58 = 60.17742 DEC(J2000) = -55:57:20.0 = -55.95555 with a 90%-confidence error radius of about 0.70 arc sec. This position is 2.3 arc sec. from the center of the XRT error circle. The estimated magnitude is 20.31 with a 1-sigma error of about 0.18. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02. Burst Advocate for this burst is D. Grupe (grupe 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 10098 table
GRB_name GRB091029A
GCN_number 10098
Detection_method GROND
ra 60.1779°
decl -55.9553°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10098 SUBJECT: GRB 091029: GROND Detection of the Optical/NIR Afterglow DATE: 09/10/29 04:42:35 GMT FROM: Adria C. Updike at Clemson U Robert Filgas (MPE Garching), Adria Updike (Clemson University), and Jochen Greiner (MPE Garching) report on behalf of the GROND team: We observed the field of GRB 091029 (Swift trigger 374210; Grupe et al., GCN #10097) 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 03:57 UT on Oct 29, 4.5 min after the GRB trigger, and are continuing. They were performed at an average seeing of 1.6" and at an average airmass of 1.22. We found a single point source within the 4.8 Swift-XRT error circle reported by Grupe et al. (GCN #10097) at RA (J2000) = 04h 00m 42.7 s DEC (J2000) = -55d 57' 19 with an uncertainty of 0.5". Based on the first 5.3 min of total exposures in g'r'i'z' and 6.7 min in JHK, we estimate preliminary magnitudes (all in AB system) of g' = 17.72 +- 0.1 mag, r' = 17.45 +- 0.1 mag, J = 17.00 +- 0.08 mag. Given magnitudes are calibrated against GROND zeropoints as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.02 mag in the direction of the burst (Schlegel et al. 1998).
GCN 10099 table
GRB_name GRB091029A
GCN_number 10099
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 10099 SUBJECT: GRB 091029: Skynet/PROMPT Observations of Peak and Fading DATE: 09/10/29 06:56:42 GMT FROM: Aaron LaCluyze at U.North Carolina A. LaCluyze, D. Reichart, K. Ivarsen, J. Haislip, 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 091029 (Grupe et al., GCN 10097) with three of the 16" PROMPT telescopes at CTIO beginning 46 seconds after the trigger in BRI through variable winds. We detect the afterglow (Grupe et al., GCN 10097) in all filters. The afterglow peaked in brightness approximately 5 - 6 minutes after the trigger, after which it has been fading with a power-law index of about -0.5.
GCN 10100 table
GRB_name GRB091029A
GCN_number 10100
Detection_method Swift-BAT Det
redshift 2.7520
Circular_text TITLE: GCN CIRCULAR NUMBER: 10100 SUBJECT: GRB 091029: Gemini-South Redshift DATE: 09/10/29 07:49:19 GMT FROM: Ryan Chornock at UC Berkeley R. Chornock, D. A. Perley, and B. E. Cobb (UC Berkeley) report on behalf of a larger collaboration: We obtained optical spectra of the afterglow of GRB 091029 (Grupe et al., GCN 10097; Filgas et al., GCN 10098; LaCluyze et al., GCN 10099) using GMOS on Gemini-South. Our spectra cover the wavelength range of 3900-8100 angstroms with the R400 grating. Our first 600s exposure, starting at 06:06 UT on Oct. 29 (2.2 hr after the BAT trigger) reveals absorption lines from Lyman-alpha, C II, C IV, Si II, and Si IV at a common redshift of 2.752, which we identify as the redshift of the GRB. The afterglow is still quite bright (R~17.8 mag at t=2.02 hr) in the acquisition image. We would like to thank German Gimeno and the Gemini staff for their assistance.
GCN 10102 table
GRB_name GRB091029A
GCN_number 10102
Detection_method Swift-XRT Det
ra 60.1779°
decl -55.9556°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10102 SUBJECT: GRB 091029: Enhanced Swift-XRT position DATE: 09/10/29 09:22:39 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 4524 s of XRT Photon Counting mode data and 7 UVOT images for GRB 091029, 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 = 60.17793, -55.95556 which is equivalent to: RA (J2000): 04h 00m 42.70s Dec (J2000): -55d 57' 20.0" 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 10103 table
GRB_name GRB091029A
GCN_number 10103
Detection_method Swift-BAT Det
ra 60.1660°
decl -55.9540°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10103 SUBJECT: GRB 091029: Swift-BAT refined analysis DATE: 09/10/29 13:30:45 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), D. Grupe (PSU), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), 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-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 091029 (trigger #374210) (Grupe, et al., GCN Circ. 10097). The BAT ground-calculated position is RA, Dec = 60.166, -55.954 deg, which is RA(J2000) = 04h 00m 40.0s Dec(J2000) = -55d 57' 12.7" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 99%. The mask-weighted light curve shows three overlapping peaks, the first starting at ~T-10 sec, peaking at T+2, +20, and +26 sec, and ending at ~T+70 sec. T90 (15-350 keV) is 39.2 +- 5 sec (estimated error including systematics). The time-averaged spectrum from T-1.8 to T+60.2 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.46 +- 0.27, and Epeak of 61.4 +- 17.5 keV (chi squared 49.9 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 2.4 +- 0.1 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+19.12 sec in the 15-150 keV band is 1.8 +- 0.1 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.88 +- 0.06 (chi squared 57.4 for 57 d.o.f.). 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/374210/BA/
GCN 10104 table
GRB_name GRB091029A
GCN_number 10104
Detection_method Other
ra 60.1647°
decl -55.9487°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10104 SUBJECT: GRB 091029: BOOTES-3 observations DATE: 09/10/29 15:07:01 GMT FROM: Antonio Deugarte at IAA-CSIC A. de Ugarte Postigo (INAF-OAB), J. Gorosabel (IAA-CSIC), P. D'Avanzo (INAF-OAB), P. Kubanek (IPL UV, IAA-CSIC), M. Jelinek, R. Cunniffe, S. Guziy, A.J. Castro-Tirado (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: We have observed the afterglow of GRB 091029 (Grupe et al. GCN 10097) using the 0.6m Yock-Allen robotic telescope (BOOTES-3). A 24x60s combined unfiltered exposure with mid epoch October 29.450 UT (6.9 h after the burst) shows the afterglow at a magnitude of R = 18.5 +/- 0.2 as compared to USNO-B1 star n. 0340-0030266 (RA, Dec = 04:00:39.53, -55:56:55.17, R2 = 16.66). A finding chart can be found at: http://www.brera.inaf.it/utenti/deugarte/GRB/091029/b3_091029.jpg Further analysis is ongoing. [GCN OPS NOTE(30oct09): Per author's request, "B.A. Allen" was changed to "W.H. Allen".]
GCN 10106 table
GRB_name GRB091029A
GCN_number 10106
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 10106 SUBJECT: GRB 091029: Swift XRT refined analysis DATE: 09/10/29 19:46:14 GMT FROM: Dirk Grupe at PSU/Swift-XRT D. Grupe (PSU) reports on behalf of the Swift-XRT team: We have analyzed the first 7 orbits of XRT data of GRB 091029 (Grupe et al. GCN Circ. 10097). The data comprise 69 s in Windowed Timing (WT) mode and 15727 s in Photon Counting (PC) mode. The enhanced XRT position has already been determined by Goad et al. (GCN circ. 10102). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.30+/-0.08 with an absorption column density consistent with the Galactic value of 1.14 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum (excluding the flare around 300 s after the burst) results in a slightly flatter X-ray spectrum with Gamma = 2.00+/-0.07. The light curve (excluding the flares) can be modelled with a double broken power-law decay with an initial decay slope alpha-1 = 3.76+0.21-0.19 with the first break at 358+48-31 s after the trigger followed by a plateau phase with a decay slope alpha-2 = -0.17+/-0.22 and a second break at 3640+3450-1270 s. After this break the decay slope is alpha-3 = 0.76+0.06-0.05. If the afterglow continues to decay with a slope of 0.76, the predicted count rates 24, 48, and 72 hours after the trigger are 0.033 counts s^-1 or 1.12e-12 ergs s^-1 cm^-2, 0.020 counts s^-1 or 6.80e-13 ergs s^-1 cm^-2, 0.014 counts s^-1 or 4.76e-13 ergs s^-1 cm^-2, respectively. This circular is an official product of the Swift-XRT team.
GCN 10107 table
GRB_name GRB091029A
GCN_number 10107
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 10107 SUBJECT: GRB 091029: Skynet/PROMPT Continued Observations of Fading DATE: 09/10/29 20:37:05 GMT FROM: Aaron LaCluyze at U.North Carolina A. LaCluyze, D. Reichart, J. Haislip, K. Ivarsen, 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 (Grupe et al., GCN 10097) of GRB 091029 (Grupe et al., GCN 10097) with three of the 16" PROMPT telescopes at CTIO in BRI. After peaking in brightness 5 - 6 minutes after the trigger (LaCluyze et al., GCN 10099) the afterglow continued to fade as a power-law of index approximately -0.5 (LaCluyze et al., GCN 10099) until at least 4.7 hours after the trigger. At 4.7 hours after the trigger, the afterglow's magnitude was I = 18.52 +/- 0.06 (statistical) +/- 0.41 (systematic; calibrated to 125 USNO B1 stars). Skynet's most recent BRI light curve, calibrated to USNO B1 stars, can be found here: http://skynet.unc.edu/grb/grb091029.png
GCN 10108 table
GRB_name GRB091029A
GCN_number 10108
Detection_method Swift-UVOT Det
ra 60.1775°
decl -55.9556°
redshift 2.7520
Circular_text TITLE: GCN CIRCULAR NUMBER: 10108 SUBJECT: GRB091029: Swift/UVOT observations DATE: 09/10/29 21:13:14 GMT FROM: Frank Marshall at GSFC F. E. Marshall (GSFC) and D. Grupe (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 091029 91 sec. after the BAT trigger (Grupe et al., GCN Circ. 10097). We detect the optical afterglow at the refined UVOT position RA, Dec 60.17745, -55.95557, which is RA (J2000) 04:00:42.59 Dec (J2000) -55:57:20.0 with an estimated uncertainty of 0.55 arcsec (radius, 90% confidence). This position is consistent with the enhanced XRT position (Goad et al., GCN 10102). The detection in the white, v, b and u filters and not in the UV filters is consistent with the redshift of 2.752 (Chornock et al., GCN 10053). The afterglow brightened by a factor of 4 between the first two observations in the white filter, which had mean observing times of T+166 s. and T+594s. The afterglow then decayed following an approximately power law form with a decay index of -0.45. This decay form lasted until at least T+8231 s. A similar optical light curve was reported by LaCluze et al. (GCN Circ. 10099 and 10107). Preliminary magnitudes and 3 sigma upper limits are reported below. Filter T_start(s) T_stop(s) Exposure(s) Mag Err ------------------------------------------------------------------------ white 91 240 147 20.22 +/- 0.13 white 584 603 19 18.75 +/- 0.14 v 635 654 19 17.81 +/- 0.26 b 559 578 19 19.04 +/- 0.28 u 303 552 19 18.42 +/- 0.08 uvw1 684 1280 58 > 19.32 uvm2 1930 1949 19 > 18.74 uvw2 611 1206 58 > 20.45 ------------------------------------------------------------------------- The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 0.02 mag (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 10111 table
GRB_name GRB091029A
GCN_number 10111
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 10111 SUBJECT: GRB 091029, SMARTS optical/IR afterglow observations DATE: 09/10/29 23:30:19 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 091029 (GCN 10097, Grupe et al.) with a mid-exposure time of 50 minutes post-burst (2009-10-29 04:43 UT). Total summed exposure times amounted to 36 minutes in I and 30 minutes in J. Imaging was done under poor (2.5") seeing conditions. The afterglow of GRB 091029 (e.g. GCN 10097, Grupe et al.; GCN 10098, Filgas et al.; GCN 10099, LaCluyze et al.) is detected in our images. Preliminary comparison to USNO-B1.0 stars in I and 2MASS stars in J indicates the following afterglow magnitudes: time post-burst I mag J mag 50 minutes 17.9+/-0.1 17.6+/-0.1 In individual I-band images, the afterglow fades by ~0.4 magnitudes between 30 and 69 minutes post-burst. During this time, the afterglow exhibits a shallow decay rate of alpha ~ -0.4+/-0.1 (where afterglow flux is proportional to t^alpha), which is consistent with the decay rate measured by LaCluyze et al. (GCN 10099).
GCN 10137 table
GRB_name GRB091029A
GCN_number 10137
Detection_method Swift-BAT Det
ra 60.1609°
decl -55.9556°
Circular_text TITLE: GCN CIRCULAR NUMBER: 10137 SUBJECT: GRB 091029: Observations from Stardome Observatory DATE: 09/11/05 08:44:38 GMT FROM: Antonio Deugarte at IAA-CSIC G. W. Christie (Stardome Obs., New Zealand), S. Dong (IAS, Princeton), A. de Ugarte Postigo (INAF-OAB, Italy) and T. Natusch (Stardome Obs., New Zealand) report: We observed the field of GRB 091029 (Swift trigger 372210, Grupe et al. GCN 10097) with the Stardome 0.4m telescope located in Auckland (New Zealand) starting at 07:55UT, 3.90 hours after BAT trigger. We used a SG530 filter that transmits wavelengths above 5300 Angstroms and a SBIG ST-L-6303E CCD (KAF-6303E detector). A nearly continuous series of 300s images was taken until 16:30UT under mostly clear conditions (seeing: 1.6-2.5"). These were co-added making 15 stacks of 6 images (1800s exposure each). The fading afterglow (Filgas et al., GCN 10098; LaCluyze et al., GCN 10099; de Ugarte Postigo et al., GCN 10104; Marshall et al. GCN 10108) was clearly detected in all images over the observing period, yielding the following psf photometry(DOPHOT): UT (mid) delT R1 Err (statistical) 29.32713 3.901 19.34 0.09 29.34906 4.428 19.32 0.08 29.37120 4.959 19.43 0.08 29.39311 5.485 19.46 0.08 29.41503 6.011 19.67 0.08 29.43360 6.456 19.57 0.08 29.45862 7.057 19.73 0.08 29.50946 8.277 19.93 0.12 29.53164 8.809 19.94 0.09 29.56044 9.501 20.16 0.09 29.59390 10.304 20.21 0.11 29.61620 10.839 20.21 0.13 29.63853 11.375 20.36 0.16 29.66081 11.910 20.41 0.17 where delT is the mid-exposure time in hours since trigger. Photometric calibration was done against USNOB1 0340-0030262 RA (J2000): 04h 00m 38.61s, DEC( J2000): -55d 55' 37.3" assuming R1=16.40. The mean power-law index over this interval was -0.94 (+/-0.05). Astrometry of the images gave the afterglow position (UCAC2) as: RA (J2000) = 04h 00m 42.62s DEC (J2000) = -55d 57' 20.2" with an uncertainty of 0.18" This position is in agreement with Marshall et al. (GCN 10108) and Grupe et al. (GCN 10097).