TITLE:   GCN CIRCULAR
NUMBER:  35068
SUBJECT: MAGIC observation of GRB 231115A, a possible magnetar giant flare
DATE:    23/11/16 22:40:37 GMT
FROM:    dpaneque@mppmu.mpg.de

The MAGIC telescopes observed GRB 231115A (RA:09:56:00.22, Dec:+69:40:48.00), a candidate Magnetar Giant Flare from M82 (GCN 35044)  after the alert issued by INTEGRAL (GCN/INTEGRAL NOTICE 10427). The observations in the very-high-energy (VHE; >100 GeV) range were performed on the night of November 15th  starting at ~T0+8h, for about 2 hours, at large zenith angles.  The fast and preliminary analysis does not show any significant detection (<2 sigma) above 250 GeV.  The preliminary integral flux upper limit (95% confidence level)  at 300 GeV is 8e-12 cm-2 s-1.

The contact persons for the MAGIC collaboration are Alicia López-Oramas (alicia.lopez@iac.es), Alessandra Lamastra (alessandra.lamastra@inaf.it)  and Giuseppe Silvestri (giuseppe.silvestri@studenti.unipd.it). MAGIC is a system of two 17m-diameter Imaging Atmospheric Cherenkov Telescopes located at the Observatory Roque de Los Muchachos of the Instituto de Astrofí­sica de Canarias (IAC) on the Canary island of La Palma, Spain (https://magic.mpp.mpg.de).