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 12097

GRB 110625A: Fermi LAT detection
2011-06-26T19:52:11Z (13 years ago)
Thomas P.H. Tam at Nat.Tsing Hua U. <>
P.H.T. Tam and A.K.H. Kong (NTHU) report:

We report on the detection of >100 MeV gamma-ray emission from the direction
of GRB 110625A (Swift trigger
456073; Page et al., GCN #12088) using the Fermi Large Area Telescope

The GRB position was outside the LAT field of view (i.e., >75 deg with
respect to the LAT boresight) at the burst
onset (T0; 2011-06-25 UT 21:08:28; GCN #12088). However, prominent emission
up to several GeV was detected
from the GRB direction around T0+200s to T0+500s, during which the light
curve seems to resemble a double-peak
structure. Using the data obtained from the above period, we localized the
LAT emission at RA, DEC (J2000 deg) =
286.6, 6.9, with a statistical error of ~0.3 deg (68% CL), which is
compatible with the refined Swift/XRT position (Page
et al., GCN #12092). A preliminary spectral fit gives a photon spectral
index of around -3 at energies above 100
Looking for U.S. government information and services? Visit