GCN Circular 20707
Subject
LIGO/Virgo G274296: Fermi-LAT search for a high-energy gamma-ray counterpart
Date
2017-02-19T21:37:18Z (8 years ago)
From
Nicola Omodei at Stanford U <nicola.omodei@stanford.edu>
Nicola Omodei (Stanford), Giacomo Vianello (Stanford), Daniel Kocevski
(NASA/MSFC) and Sara Buson (GSFC) report on behalf of the Fermi-LAT team:
We have searched data collected by the Fermi Large Area Telescope (LAT)
for possible high-energy (E > 100 MeV) gamma-ray emission in
spatial/temporal coincidence with the LIGO/Virgo trigger G274296.
The region of the LIGO map with probability >90% entered the LAT field
of view at T0+400 (T0 = 2017-02-17 06:05:53 UTC), and reached full
coverage at about 7ks from T0.
We searched for a transient counterpart within the LIGO 90% probability
contour in the time window from T0 to T0 + 10 ks and found no
significant new sources.
We also performed a search that adapted the time interval of the
analysis to the exposure of each region of the sky. No significant
candidate counterpart was found.
The Fermi-LAT is a pair conversion telescope designed to cover the
energy band from 20 MeV to greater than 300 GeV. It is the product of an
international collaboration between NASA and DOE in the U.S. and many
scientific institutions across France, Italy, Japan and Sweden.