TITLE: GCN CIRCULAR NUMBER: 39298 SUBJECT: GRB 250211B: A long GRB detected by INTEGRAL DATE: 25/02/12 07:26:35 GMT FROM: Sandro Mereghetti at IASF-Milano/INAF sandro.mereghetti@inaf.it

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 gamma ray burst lasting about 60 s has been detected by IBAS in the IBIS/ISGRI data at 21:27:10 UT of 2025 February 11.

The refined coordinates (J2000) are: R.A.= 276.3784 deg DEC.= -31.9655 deg with an uncertainty of 2 arcmin (90% c.l.).

The burst had a peak flux of about 0.2 ph/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 4e-7 erg/cmq.

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

View this GCN Circular online at https://gcn.nasa.gov/circulars/39298. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...