[vsnet-grb-info 10148] GRB 110120A: Fermi LAT detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11597
SUBJECT: GRB 110120A: Fermi LAT detection
DATE:    11/01/24 07:50:35 GMT
FROM:    Nicola Omodei at INFN(Pisa)/GLAST  <nicola.omodei at pi.infn.it>

Nicola Omodei (Stanford University), James Chiang (SLAC/KIPAC), Valerie Connaughton (UAH) and Yasuyuki Tanaka (ISAS/JAXA) report on behalf of the Fermi Large Area Telescope (LAT) collaboration.

Based on an on-ground analysis, the Large Area Telescope (LAT), on-board the Fermi Gamma-ray Space Telescope, detected high energy emission up to ~2 GeV associated with the GBM-detected burst GRB 110120A (Lin, GCN 11591).  The emission in the LAT lasts over 100 seconds, with the highest-energy photon arriving 72 sec after the GBM trigger time.
The best localization is RA, DEC (J2000 deg) = 61.6, -12.0 (04h 06m 24s, -12d 00' 00"), with an error of 0.4 deg (68% CL), compatible with the IPN triangulation from Hurley et al. (GCN 11595).

Further analysis is ongoing.

The Fermi LAT point of contact for this burst is Yasuyuki Tanaka (tanaka at astro.isas.jaxa.jp).

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.