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GCN Circular 35068

MAGIC observation of GRB 231115A, a possible magnetar giant flare
2023-11-16T22:40:37Z (6 months ago)
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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 (, Alessandra Lamastra (  and Giuseppe Silvestri ( 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 (
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