GRB080916C

This page lists all entries on GRB080916C in GRBweb

Summary Fermi GBM IPN Fermi LAT GCN 8245 GCN 8246 GCN 8251 GCN 8253 GCN 8255 GCN 8257 GCN 8258 GCN 8261 GCN 8262 GCN 8272 GCN 8273 GCN 8274 GCN 8278 GCN 10019

Summary table
Variable Value Source
GRB_name_Fermi GRB080916009
T0 0:12:44.632 UTC GCN_circulars,Konus-Wind Det
ra 119.8472° Fermi_LAT
decl -56.6383° Fermi_LAT
pos_error 1.39e-04° Fermi_LAT
T90 62.977 s Fermi_GBM
T90_error 0.81 s Fermi_GBM
T90_start 0:12:46.894 UTC Fermi_GBM
fluence 6.03e-05 erg/cm² Fermi_GBM
fluence_error 7.00e-08 erg/cm² Fermi_GBM
T100 65.239 s
GBM_located False
mjd 54725.008849907405 GCN_circulars,Konus-Wind Det
Fermi GBM table
GRB_name_Fermi GRB080916009
trigger_name bn080916009
ra 119.8000°
decl -56.6000°
pos_error 2.52e+00°
datum 2008-09-16
t_trigger 0:12:45.614 UTC
T90 62.977 s
T90_error 0.81 s
T90_start 0:12:46.894 UTC
fluence 6.03e-05 erg/cm²
fluence_error 7.00e-08 erg/cm²
flux_1024 1.37e+01 erg/cm²/s
flux_1024_error 2.93e-01 erg/cm²/s
flux_1024_time 2.37e+00 erg/cm²/s
flux_64 1.64e+01 erg/cm²/s
flux_64_error 1.65e+00 erg/cm²/s
IPN table
GRB_name GRB080916C
ra 119.8792°
decl -56.5833°
pos_error 1.67e-01°
Fermi LAT table
GRB_name_Fermi GRB080916009
GRB_name GRB080916C
MET 243216766.0
datum 2008-09-16
t_trigger 0:12:45 UTC
ra 119.8472°
decl -56.6383°
pos_error 1.39e-04°
GCN 8245 table
GRB_name GRB080916C
GCN_number 8245
Detection_method Fermi GBM Det
t_trigger 0:12:45 UTC
ra 121.8000°
decl -61.3000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8245 SUBJECT: GRB 080916C: Fermi GBM Detection DATE: 08/09/16 18:09:46 GMT FROM: Alexander van der Horst at NASA/MSFC Adam Goldstein (UAH) and Alexander van der Horst (NASA/MSFC) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 00:12:45 UT on 16 September 2008, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located the bright GRB 080916C (trigger 243216766 / 080916.009). The on-ground calculated location, using the GBM trigger data, is RA = 121.8, Dec = -61.3 (J2000 degrees, equivalent to J2000 8h 07m, -61d 18'), with a statistical uncertainty of less than 1 degree (radius, 1-sigma containment) and an additional systematic error which is currently estimated to be 2 to 3 degrees. The angle from the Fermi Large Area Telescope (LAT) boresight is 52 degrees. This GRB has several peaks, with T90 (50-300 keV) = 66 s and T50 (50-300 keV) = 33 s. This burst is detected up to several MeV; spectral analysis is ongoing."
GCN 8246 table
GRB_name GRB080916C
GCN_number 8246
Detection_method Fermi LAT Det
t_trigger 0:12:45 UTC
ra 121.8000°
decl -61.3000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8246 SUBJECT: GRB 080916C: Fermi LAT observation DATE: 08/09/16 18:25:23 GMT FROM: Nicola Omodei at INFN(Pisa)/GLAST H. Tajima (SLAC), J. Bregeon (INFN Pisa), J. Chiang (SLAC), G. Thayer (SLAC) on behalf of the Fermi LAT team: We report a detection by the Fermi Large Area Telescope (LAT) of emission from the long GRB 080916C, which was triggered by the Fermi Gamma-ray Burst Monitor (GBM) at 00:12:45 UT on September 16th 2008 (GCN 8245). The angle of the GBM best position (RA, Dec=121.8,-61.3) with respect to the LAT boresight was 52 degrees at the time of the trigger, which is close the edge of our field of view. The data from the Fermi LAT shows a significant increase in the event rate within 10 degrees of the GBM location after the GBM trigger that is spatially and temporally correlated with the GBM emission with high significance. More than 10 photons are observed above 1 GeV during this time. The best LAT on-ground localization is found to be (RA,Dec=119.88, -56.59) with a 90% containment radius of 0.13 deg (statistical; 68% containment radius: 0.09 deg, preliminary systematic error is less than 0.1 deg) which is consistent with the GBM localization. This circular is an official product of the Fermi LAT team.
GCN 8251 table
GRB_name GRB080916C
GCN_number 8251
Detection_method IPN Triangulation
ra 119.8300°
decl -56.7900°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8251 SUBJECT: IPN Triangulation and Energy Spectrum of GRB080916C DATE: 08/09/16 22:36:31 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley and J. Goldsten, on behalf of the MESSENGER NS GRB team, S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline on behalf of the Konus-Wind team E. Bellm, D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger, W. Hajdas, and A. Zehnder, on behalf of the RHESSI GRB team, A. von Kienlin, G. Lichti, and A. Rau, on behalf of the INTEGRAL SPI-ACS GRB team, and E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Galli, and M. Marisaldi, on behalf of the AGILE Team, report: GRB080916C (Goldstein and van der Horst, GCN 8245; Tajima et al., GCN 8246) was also observed by AGILE (MCAL, SuperAGILE, and ACS - but not localized), RHESSI, INTEGRAL (SPI-ACS), Konus-Wind, and MESSENGER. A preliminary triangulation gives a long, narrow error box centered at RA, Dec = 119.830, -56.790 degrees (0.2 degrees from the center of the LAT error circle), whose corners are: RA(2000) DEC(2000) 119.486 -62.130 120.126 -62.702 119.901 -50.632 120.321 -51.274 A figure is posted at ssl.berkeley.edu/ipn3/080916C. Using the RHESSI data between 100 keV and 17 MeV, the time-integrated spectrum for the 62-second interval beginning at 00:12:46 UT can be described by a cutoff power law with alpha ~ -1.2 +/- 0.3, Epeak ~ 1100 +/- 500 keV, and fluence ~ (9.0 +/- 1.6) x 10^-5 ergs/cm^2 (100 keV - 10 MeV). Both the triangulation and the energy spectrum can be substantially improved.
GCN 8253 table
GRB_name GRB080916C
GCN_number 8253
Detection_method Swift-XRT Other
ra 119.8459°
decl -56.6389°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8253 SUBJECT: GRB 080916C: Swift/XRT detection of possible afterglow DATE: 08/09/17 04:41:53 GMT FROM: Jamie A. Kennea at PSU/Swift-XRT Jamie A. Kennea reports on behalf of the Swift Team: At 17:08 UT, September 16th 2008 Swift began TOO observations of the Fermi GBM and LAT detected GRB 080916C (GCN 8245,8246). Preliminary analysis of downlinked data from this observation reveals a single point source detected in the field of view at RA, Dec = 119.8459, -56.63891 which is equivalent to: RA (J2000): 07h 59m 23.0s Dec (J2000): -56d 38' 20.1" with an estimated uncertainty of 8 arcsec (radius, 90% confidence). We note that this point source is uncatalogued and 189 arcseconds from the center of the Fermi LAT error circle (GCN 8246), within the LAT 90% confidence error circle. Currently we cannot determine if this source is fading, and therefore cannot confirm if this source is associated with GRB 080916C. Observations of this source are on-going.
GCN 8255 table
GRB_name GRB080916C
GCN_number 8255
Detection_method Swift-XRT Other
ra 119.8471°
decl -56.6379°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8255 SUBJECT: GRB 080916C: Enhanced XRT position DATE: 08/09/17 09:01:33 GMT FROM: Phil Evans at U of Leicester P.A. Evans, J.P. Osborne, A.P. Beardmore and M.R. Goad, (U. Leicester) report on behalf of the Swift-XRT team. Using 1310 s of XRT Photon Counting mode data and 1 UVOT images, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching to the USNO-B1 catalogue): RA, Dec = 119.84706, -56.63788 which is equivalent to: RA (J2000): 07 59 23.29 Dec (J2000): -56 38 16.4 with an uncertainty of 2.1 arcsec (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 http://www.swift.ac.uk/xrt_positions/Goad.pdf), the current algorithm is an extension of this method. This circular is an official product of the Swift-XRT team.
GCN 8257 table
GRB_name GRB080916C
GCN_number 8257
Detection_method correction
ra 119.8472°
decl -56.6383°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8257 SUBJECT: GRB 080916C: GROND Detection of the Optical Afterglow Candidate DATE: 08/09/17 10:55:42 GMT FROM: Christian Clemens at MPE C. Clemens (MPE), A. Rossi (Tautenburg Obs.), J. Greiner and S. McBreen (both MPE) report on behalf of the GROND team: GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m ESO/MPI telescope at La Silla Observatory (Chile) observed the field of GRB 080916C, which triggered Fermi GBM (Goldstein et al., GCN #8245) and for which significant correlated emission was detected by the Fermi LAT (Tajima et al., GCN #8246). The field was followed up by Swift XRT (Kennea et al., GCN #8253). Observations started at 07:57 UT on September 17th, 2008, 31.7 hr after the GBM trigger. They were performed at an average seeing of 1.5" and at an average airmass of 1.7 as well as under bright moon. We found a faint source at the edge of the astrometrically corrected 2.1'' Swift-XRT error circle reported by Evans et al. (GCN #8255) at RA (J2000) = 07h 59m 23.32s DEC (J2000) = -56d 38' 18.0'' with an uncertainty of 0.5". Based on the first 50 min of effective exposures, we estimate a preliminary magnitude of z' ~ 21.74 mag +/- 0.17. Given magnitude is calibrated against USNO-B1 field stars. No statement about variability can be made at this point. Further observations are planned. Please note, that no correction for the Galactic foreground reddening of E(B-V) = 0.32 mag (Schlegel et al., 1998) has been applied.
GCN 8258 table
GRB_name GRB080916C
GCN_number 8258
Detection_method Konus-Wind Det
t_trigger 0:12:44.632 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 8258 SUBJECT: Konus-Wind observation of GRB 080916C DATE: 08/09/17 11:30:55 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report: The long GRB 080916 (Fermi GBM trigger 243216766/080916.009; Goldstein and van der Horst, GCN 8245; Tajima et al., GCN 8246; Hurley et al., GCN 8251) triggered Konus-Wind at T0=764.632 s UT (00:12:44.632). The burst light curve shows the main part with a duration of ~70 s followed by a weak tail seen at least till ~T0+200 s. As observed by Konus-Wind the burst had a fluence of (1.24 +/- 0.17)x10^-4 erg/cm2, and a 256-ms peak flux measured from T0+3.168 s of (1.19 +/- 0.30)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum of the burst (from T0 to T0+71.424 s) is well be fitted (in the 20 keV - 10 MeV range) by GRBM (Band) model for which: the low-energy photon index is alpha = -1.040(-0.058, +0.065), the high energy photon index beta = -2.26(-0.40, +0.21), the peak energy Ep = 505(-70, +79) keV (chi2 = 75.6/84 dof). All the quoted errors are at the 90% confidence level. The Konus-Wind light curve of this GRB is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB080916_T00764/
GCN 8261 table
GRB_name GRB080916C
GCN_number 8261
Detection_method Swift Other
ra 119.8468°
decl -56.6380°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8261 SUBJECT: GRB 080916C: Swift XRT refined analysis DATE: 08/09/17 15:24:55 GMT FROM: Matteo Perri at ISAC/ASDC M. Perri, B. Preger, G. Stratta (ASDC) report on behalf of the Swift XRT team: The Swift XRT started observing the field of the FERMI GRB 080916C (Goldstein et al., GCN Circ. 8245) at 2008-09-16 17:11:28 UT, about 17 hours after the trigger. We confirm that the X-ray source reported by Kennea (GCN Circ. 8253) is the afterglow of the GRB. Using 2614 s of XRT Photon Counting mode data and 2 UVOT images, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching to the USNO-B1 catalogue): RA, Dec = 119.84684, -56.63801 which is equivalent to: RA (J2000): 07 59 23.24 Dec (J2000): -56 38 16.8 with an uncertainty of 1.9 arcsec (90% confidence). This position is consistent with the XRT position reported by Evans et al. (GCN Circ. 8255) using less data. The X-ray light curve from T+61 ks to T+102 ks can be fit with a single power-law model with a decay index of 1.7 (-0.7) (+1.0). A 7.6 ks exposure X-ray spectrum from T+61 ks to T+102 ks can be well fit by an absorbed power-law model with a photon index of 2.1 (+0.9 -0.7) and a column density of 3.7 (+3.3) (-2.1) x 10^21 cm^-2. We note that the Galactic column density value in the direction of the burst is 1.5 x 10^21 cm^-2. The observed 0.3-10.0 keV flux is 8.6 x 10-13 erg cm^-2 s^-1 which corresponds to an unabsorbed flux of 1.5 x 10^-12 erg cm^-2 s^-1. Providing the source continues to decay at the same rate, we predict an observed flux of about 3 x 10^-13 erg cm^-2 s^-1 at T+2 days. This circular is an official product of the Swift-XRT team.
GCN 8262 table
GRB_name GRB080916C
GCN_number 8262
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8262 SUBJECT: GRB 080916C: Swift UVOT Refined Analysis DATE: 08/09/17 17:59:31 GMT FROM: Erik Hoversten at Swift/Penn State E. A. Hoversten (PSU), P. Schady (MSSL-UCL), and M. Perri (ASDC) report on behalf of the Swift UVOT team: The Swift/UVOT began observations of the field of GRB 080916C 17.0 hours after the Fermi GBM dectection (Goldstein & van der Horst, GCN 8245). No afterglow is detected within the XRT error circle (Evans, et al., GCN 8255) in any of the observed UVOT filters. UVOT magnitude 3-sigma upper limits are reported in the following table: Filter T_start T_stop Exp(s) Mag (3-sigma upper limit) ------------------------------------------------------------- v 101253 101857 590 > 19.75 u 96469 97132 645 > 19.99 uvw1 66675 67517 829 > 20.34 uvw1 95562 96462 886 > 20.38 uvm2 61130 66667 1090 > 20.31 uvm2 94655 95555 886 > 20.20 uvw2 100347 101246 886 > 20.43 The quoted upper limits have not been corrected for the large expected Galactic extinction along the line of sight of E_{B-V} = 0.32 mag (Schlegel et al., 1998). All photometry is on the UVOT flight system described in Poole et al. (2008, MNRAS, 383, 627).
GCN 8272 table
GRB_name GRB080916C
GCN_number 8272
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 8272 SUBJECT: GRB 080916C: GROND Confirmation of the Optical Afterglow DATE: 08/09/19 10:08:00 GMT FROM: Christian Clemens at MPE C. Clemens (MPE Garching), A. Rossi (Tautenburg Obs.), J. Greiner, S. McBreen, T. Kruehler, A. Yoldas (all MPE Garching), A. Kupcu Yoldas (ESO) and G. Szokoly (Eoetvoes Univ., Budapest) report on behalf of the GROND team: We observed the field of GRB 080916C for a second time with GROND at 08:04 UT on September 19th, 2008, 3.3 d after the GBM trigger with 54 min of effective exposures. Observations were performed at an average seeing of 1.7" and at an average airmass of 1.7. We do not detect the afterglow candidate first reported by Clemens et al. (GCN #8257) with the following 5-sigma upper limits: z' > 22.7 mag. These measurements strongly indicate a fading of the source compared to our first epoch observations. We therefore propose this is to be the afterglow of GRB 080916C.
GCN 8273 table
GRB_name GRB080916C
GCN_number 8273
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 8273 SUBJECT: GRB 080916C: GROND Confirmation of the Optical Afterglow DATE: 08/09/19 10:08:07 GMT FROM: Christian Clemens at MPE C. Clemens (MPE Garching), A. Rossi (Tautenburg Obs.), J. Greiner, S. McBreen, T. Kruehler, A. Yoldas (all MPE Garching), A. Kupcu Yoldas (ESO) and G. Szokoly (Eoetvoes Univ., Budapest) report on behalf of the GROND team: We observed the field of GRB 080916C for a second time with GROND at 08:04 UT on September 19th, 2008, 3.3 d after the GBM trigger with 54 min of effective exposures. Observations were performed at an average seeing of 1.7" and at an average airmass of 1.7. We do not detect the afterglow candidate first reported by Clemens et al. (GCN #8257) with the following 5-sigma upper limits: z' > 22.7 mag. These measurements strongly indicate a fading of the source compared to our first epoch observations. We therefore propose this is to be the afterglow of GRB 080916C.
GCN 8274 table
GRB_name GRB080916C
GCN_number 8274
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 8274 SUBJECT: GRB 080916C: IRSF/SIRUS NIR Observation DATE: 08/09/19 14:41:06 GMT FROM: Nobuyuki Kawai at Tokyo Tech T. Nagayama (Kyoto University) reports on behalf of the IRSF/SIRIUS team: We have imaged the field of GRB 080916C (van der Horst, GCN 8245) based on the localization by Fermi/LAT (Tajima et al, GCN 8246) in J, H, and Ks with the Simultaneous three-color InfraRed Imager for Unbiased Survey (SIRIUS) on the Nagoya-SAAO 1.4m telescope (IRSF) starting at 2:53 on September 17 UT for 50 min. The optical afterglow candidate suggested by Clemens et al. (GCN 8257, GCN 8272) was detected marginally in H and Ks bands. The preliminary magnitude was Ks= 18.6 +- 0.5.
GCN 8278 table
GRB_name GRB080916C
GCN_number 8278
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8278 SUBJECT: GRB 080916C: Fermi GBM Spectral Analysis DATE: 08/09/20 23:41:31 GMT FROM: Alexander van der Horst at NASA/MSFC Alexander van der Horst (NASA/ORAU) and Adam Goldstein (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "We have performed spectral analysis of GRB 080916C (GCN 8245, 8246). The time averaged spectrum, from 8 keV up to 30 MeV, of the main emission up to 66 seconds after the burst is best fit by a Band function with Epeak = 424 +/- 24 keV, alpha = -0.91 +/- 0.02, and beta = -2.08 +/- 0.06. The fluence (8 keV - 30 MeV) is 1.9e-4 erg/cm^2. These spectral analysis results are preliminary; the final results will be published in the GBM GRB Catalog."
GCN 10019 table
GRB_name GRB080916C
GCN_number 10019
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 10019 SUBJECT: Radio observation of GRB080916c with ATCA DATE: 09/10/13 09:06:49 GMT FROM: Aquib Moin at CIRA/ATNF Aquib Moin (Curtin Institute of Radio Astronomy / Australia Telescope National Facility), Steven Tingay (Curtin Institute of Radio Astronomy), Chris Phillips (Australia Telescope National Facility), Gregory Taylor (University of New Mexico), Mark Wieringa (Australia Telescope National Facility) and Ralph Martin (Perth Observatory) report: We observed the XRT position of the GRB080916c (GCN 8261) at 5.5 GHz with the Australia Telescope Compact Array (ATCA) between 14:00:00 UT and 20:00:00 UT on July 01, 2009. We did not detect a radio source at the XRT position of the GRB080916c (GCN 8261). The radio flux density at the afterglow position found out to be 0.230 +/- 0.180 mJy/beam (1-sigma). The compact array was in its most compact configuration. The Australia Telescope Compact Array (/ Parkes telescope / Mopra telescope / Long Baseline Array) is part of the Australia Telescope which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. See the 5.5 GHz field image at: http://cira.ivec.org/dokuwiki/doku.php/grb/grb080916c_field_image