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GCN Circular 22228

GRB 171210A: Fermi-LAT detection
2017-12-10T17:48:25Z (6 years ago)
Elisabetta Bissaldi at U.Innsbruk/IAPP <>
E. Bissaldi (Politecnico & INFN Bari), F. Longo (Univ & INFN Trieste) 
and D. Kocevski (MSFC) report��on behalf of the Fermi-LAT team:

"At 11:49:15.26 UT on December 10, 2017 Fermi-LAT detected high-energy emission from GRB 171210A,��which was also detected by Fermi-GBM (trigger 534599360 / 171210493).

The best LAT on-ground location is found to be

RA, Dec = 335.29, 24.44 (J2000)

with an error radius of 0.15 deg (90 % containment, statistical error only).��

This was 50 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 correlated with the trigger with high significance.��

The highest-energy photon is a 12��GeV��event which is observed��1400��seconds after the GBM trigger.

A Swift ToO has been requested for this burst.

The Fermi-LAT point of contact for this burst is Elisabetta Bissaldi (

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."
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