GCN Circular 20676
Subject
GRB 170214A: Fermi-LAT detection
Date
2017-02-15T00:13:48Z (7 years ago)
From
Judith Racusin at GSFC <judith.racusin@nasa.gov>
J. L. Racusin (NASA/GSFC), G. Vianello (Stanford), and J. Perkins (NASA/GSFC),
report on behalf of the Fermi-LAT team:
At 15:34:26.92 on February 14, 2017, Fermi-LAT detected high-energy
emission from GRB 170214A, which was also detected by Fermi-GBM
(trigger 508779271 / 170214649, Mailyan et al., GCN 20675).
The best LAT on-ground location is found to be
RA, Dec: 256.33, -1.88 (degrees, J2000)
with an error radius of 0.08 deg (90% containment, statistical error only).
This was 33 deg from the LAT boresight at the time of the trigger, and
triggered an autonomous repoint of the spacecraft.
The data from the Fermi-LAT show a significant increase in the event rate
that is spatially and temporally correlated with the GBM emission with high
significance. More than 160 photons above 100 MeV and more than 13
photons above 1 GeV are observed within 1000 seconds. The highest-
energy photon is a 7.8 GeV event which is observed ~105 seconds after
the GBM trigger.
A Swift ToO has been approved for this burst.
The Fermi-LAT point of contact for this burst is
Judith Racusin (judith.racusin@nasa.gov).
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.