GCN Circular 11002
Subject
GRB 100727A: Fermi GBM observation
Date
2010-07-27T14:57:12Z (14 years ago)
From
Andreas von Kienlin at MPE <azk@mpe.mpg.de>
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"At 05:42:22.00 UT on 27 July 2010, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 100727A (trigger 301902143 / 100727238),
which was also detected by the SWIFT-BAT (Morris et al. 2010, GCN 10998)
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 95.1 degrees.
The GBM light curve consists of single peak
with a duration (T90) of about 24 +/- 3 s (50-300 keV).
The time-averaged spectrum from T0-6.144 s to T0+12.288 s is
best fit by a simple power law function with
index -1.71 +/- 0.04 (Castor C-STAT 785 for 473 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(2.03 +/- 0.14)E-06 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0-4.096 s in the 8-1000 keV band
is 1.6 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."