Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 15396

GRB 131028A: Fermi GBM detection
2013-10-29T13:35:30Z (11 years ago)
Andreas von Kienlin at MPE <>
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:

"At 01:49:02.35 UT on 28 October 2013, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 131028A (trigger 404617745 / 131028076).

The on-ground calculated location, using the GBM trigger
data, is RA = 57.0, DEC = +72.2 (J2000 degrees,
equivalent to 03 h 48 m, 72 d 12 '), with an uncertainty
of 1.2 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 123 degrees.

This burst was also independently detected by INTEGRAL SPI-ACS.

The GBM light curve consists of a single pulse
with a duration (T90) of about 17 s (50-300 keV).
The time-averaged spectrum from T0-1.28 s to T0+22.27 s is
best fit by a Band function with Epeak = 888 +/-18 keV,
alpha = -0.71 +/- 0.01, and beta = -3.4 +/-0.2. 

The event fluence (10-1000 keV) in this time interval is
(1.62 +/- 0.02)E-04 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+8.13 s in the 10-1000 keV band is 62 +/- 1 ph/s/cm^2.

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
Looking for U.S. government information and services? Visit