GCN Circular 18711
Subject
GRB 151221A: INTEGRAL detection of a short burst or possible SGR
Date
2015-12-21T10:18:14Z (8 years ago)
From
Sandro Mereghetti at IASF/CNR <sandro@iasf-milano.inaf.it>
S.Mereghetti (IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno,
E.Bozzo (ISDC, Versoix), and J.Borkowski (CAMK, Torun) on behalf of the
IBAS Localization Team report:
a gamma ray burst lasting about 50 ms has been detected by IBAS in the
IBIS/ISGRI data at 02:51:12.7 UT of December 21, 2015 with a significance
below the threshold for automatic alert delivery (IBAS Weak Alert n.7313)
The refined coordinates (J2000) are:
R.A.= 293.7327 deg
DEC.= 21.8843 deg
with an uncertainty of 2 arcmin (90% c.l.).
The burst had a fluence of about 4e-8 erg/cm2 (20-200 keV, 0.1-s
integration time).
The soft spectrum, short duration, low galactic latitude and position
inside the supernova remnant G57.2+0.8 suggest taht this event could be
due to a new Soft Gamma-ray Repeater.
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html