GRB080825C

This page lists all entries on GRB080825C in GRBweb

Summary Fermi GBM Fermi LAT GCN 8141 GCN 8183 GCN 8184

Summary table
Variable Value Source
GRB_name_Fermi GRB080825593
T0 14:13:48 UTC Fermi_LAT
ra 233.9500° Fermi_LAT
decl -4.5500° Fermi_LAT
pos_error 7.70e-01° Fermi_LAT
T90 20.992 s Fermi_GBM
T90_error 0.231 s Fermi_GBM
T90_start 14:13:49.321 UTC Fermi_GBM
fluence 3.42e-05 erg/cm² Fermi_GBM
fluence_error 9.70e-08 erg/cm² Fermi_GBM
T100 22.313 s
GBM_located False
mjd 54703.59291666667 Fermi_LAT
Fermi GBM table
GRB_name_Fermi GRB080825593
trigger_name bn080825593
ra 234.0000°
decl -4.7000°
pos_error 2.51e+00°
datum 2008-08-25
t_trigger 14:13:48.105 UTC
T90 20.992 s
T90_error 0.231 s
T90_start 14:13:49.321 UTC
fluence 3.42e-05 erg/cm²
fluence_error 9.70e-08 erg/cm²
flux_1024 2.53e+01 erg/cm²/s
flux_1024_error 2.72e-01 erg/cm²/s
flux_1024_time 2.69e+00 erg/cm²/s
flux_64 3.13e+01 erg/cm²/s
flux_64_error 1.12e+00 erg/cm²/s
Fermi LAT table
GRB_name_Fermi GRB080825593
GRB_name GRB080825C
MET 241366429.0
datum 2008-08-25
t_trigger 14:13:48 UTC
ra 233.9500°
decl -4.5500°
pos_error 7.70e-01°
GCN 8141 table
GRB_name GRB080825C
GCN_number 8141
Detection_method Fermi LAT Other
ra 232.2000°
decl -4.9000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8141 SUBJECT: GRB080825C: GLAST Burst Monitor detection DATE: 08/08/27 03:38:23 GMT FROM: Alexander van der Horst at NASA/MSFC A.J. van der Horst (NASA/ORAU) and V. Connaughton (UAH) report on behalf of the Fermi GBM Team: "At 14:13:48 UT on 25 August 2008, the Fermi GBM triggered and located GRB 080825C (trigger 241366429 / 080825.593). The on-ground calculated location, using the GBM trigger data, is RA = 232.2, Dec = -4.9 (J2000 degrees, equivalent to 15h 29m, -4d 54'), with an uncertainty of 1.5 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT boresight is 60 degrees. This GRB has several peaks, with T90 (50-300 keV) = 22 s and T50 (50-300 keV) = 12 s. The time-averaged spectrum (8-910 keV) from T0 to T0+22.1 s is best fit by a Band function with Epeak = 155 +/- 5 keV, alpha = -0.39 +/- 0.04, and beta = -2.34 +/- 0.09. The fluence (50-300 keV) is 2.4E-5 erg/cm^2. The spectral analysis results presented above are preliminary; the final results will be published in the GBM GRB Catalog."
GCN 8183 table
GRB_name GRB080825C
GCN_number 8183
Detection_method Fermi LAT Det
t_trigger 14:13:48 UTC
ra 232.2000°
decl -4.6000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8183 SUBJECT: GRB080825C: Fermi-LAT observations DATE: 08/09/05 17:45:46 GMT FROM: Aurelien Bouvier at Stanford A. Bouvier (SLAC), D. Band (GSFC), J. Bregeon (INFN Pisa), J. Chiang (SLAC), S. Cutini (ASDC), B. Dingus (LANL), N. Gehrels (GSFC), Y. Fukazawa (Hiroshima U), M. Hayashida (SLAC), F. Longo (INFN Trieste), J. McEnery (GSFC), M. Ohno (JAXA), N. Omodei (INFN Pisa), V. Pelassa (LPTA), F. Piron (LPTA), D. Sanchez (LLR), J. Scargle (NASA Ames), H. Tajima (SLAC), T. Tanaka (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 GRB080825C, which was triggered by the Fermi Gamma-ray Burst Monitor (GBM) at 14:13:48 UT on August 25th 2008 (GCN 8141 by Van der Horst et al.). The angle of the GBM best localization (ra, dec=232.2,-4.6) with the LAT boresight was 60 deg at the time of the trigger which is on the edge of our field of view. The data from the Fermi LAT shows a significant increase in the event rate within 10 degree of the GBM localization and up to 35 seconds after the GBM trigger that is spatially and temporally correlated with the GBM emission with a significance of more than 5 sigma. All the LAT events detected during the GBM emission have energies below 1 GeV. The best LAT on-ground localization is found to be RA,DEC=233.96,-4.72 deg with a 90% containment radius of 1.5 deg (statistical+systematics; 68% containment radius: 0.95 deg) which is consistent with the GBM localization. This circular is an official product of the Fermi LAT team.
GCN 8184 table
GRB_name GRB080825C
GCN_number 8184
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8184 SUBJECT: GRB 080825C: Fermi GBM Spectral Analysis DATE: 08/09/05 18:01:27 GMT FROM: Alexander van der Horst at NASA/MSFC A.J. van der Horst (NASA/ORAU), V. Connaughton and M.S. Briggs (UAH) report on behalf of the Fermi GBM Team: "We have performed time-resolved spectroscopy of GRB 080825C (GCN 8141, GCN 8183). The main emission up to 23 seconds is best fit by the Band function. Time-resolved spectra of this emission period display the commonly observed hard-to-soft spectral evolution, with Epeak decreasing from 170 to 110 keV, while the spectral indices remain roughly constant at alpha ~ -0.4 and beta ~ -2.4, consistent with the time-averaged spectral result (GCN 8141). Weaker emission following this period lasts a further 11 seconds and deviates from this spectral behaviour. The spectrum of this tail over the energy range 8-900 keV is best fit by a single power law with index -1.41 +/- 0.09. The spectral analysis results presented above are preliminary; the final results will be published in the GBM GRB Catalog."