[vsnet-grb-info 19994] GRB 171102A: Fermi-LAT detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22081
SUBJECT: GRB 171102A: Fermi-LAT detection
DATE:    17/11/02 15:00:44 GMT
FROM:    Manal Yassine at INAF,Trieste  <mychbib at gmail.com>

**M. Yassine (Univ & INFN Trieste), E. Bissaldi (Politecnico & INFN Bari)
and D. Kocevski (NASA/MSFC) report on behalf of the Fermi-LAT team:

At 2:33:35.99 UT on November 02, 2017, Fermi-LAT detected
high-energy emission from GRB 171102A,
which was also detected by Fermi-GBM (trigger 531282820).

The best LAT on-ground location is found to be

RA, Dec: 188.41, 53.63 (degrees, J2000)

with an error radius of 0.57 deg (90% containment, statistical error only).
This was 43 deg from the LAT boresight at the time of the trigger.

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 17 photons above 100 MeV are observed within 500 seconds.
The highest-energy photon is a 500 MeV event which is
observed 328 seconds after the GBM trigger.

A Swift ToO has been requested for this burst 
<https://confluence.slac.stanford.edu/pages/createpage.action?spaceKey=SCIGRPS&title=A+Swift+ToO+has+been+requested+for+this+burst%3F&linkCreation=true&fromPageId=103583868>

The Fermi-LAT point of contact for this burst is
Manal Yassine (mychbib at gmail.com <http://gmail.com>).

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.