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GCN Circular 35037

Subject
GRB 231115A: a short hard GRB detected by IBAS, poistionally coincident with M82
Date
2023-11-15T16:26:24Z (4 months ago)
From
Diego Gotz at CEA <diego.gotz@cea.fr>
Via
Web form
S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA, Saclay),   C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report:

a short hard burst lasting about 150 ms has been detected by IBAS in the  IBIS/ISGRI data at 15:36:22  UT of November 15, 2023.

The refined coordinates (J2000) are:
R.A.= 149.000901 [degrees] 
DEC.=  69.680130  [degrees]
with an uncertainty of 2  arcmin (90% c.l.).

We note that this position is consistent with the galaxy M82, so this event, which also triggered Fermi/GBM,  may be due to a magnetar giant flare or to a nearby merger. So we encourage follow-up at other wavelengths.

A plot of the light curve will  be posted at 
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
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