TITLE: GCN CIRCULAR NUMBER: 38997 SUBJECT: GRB 250119B: INTEGRAL/SPI-ACS detection DATE: 25/01/20 11:35:31 GMT FROM: Aishwarya L Thakur at INAF-IAPS, Rome aishth@outlook.com

Patrizia Barria(a,b), Giulia Gianfagna(a), James Craig Rodi(a), Aishwarya Linesh Thakur(a), Luigi Piro(a), Lorenzo Natalucci(a,b) report:

GRB 250119B was discovered by Fermi/GBM (GCN 38979, 38980) at time 2025-01-16T08:27:01 (UTC). We searched for any corresponding counterpart in the INTEGRAL/SPI-ACS data.

In a SPI-ACS light curve above 80 keV we find a signal temporally coincident with the GBM detection having an approximate duration of ~ 60 sec.The signal consists of several pulses over this duration.

The approximate peak count rate in SPI-ACS is 90,000 cts/s for E>80 keV, over a median background rate of 65,400 cts/s.

This work is based on observations with INTEGRAL, an ESA project with instruments and a science data centre funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, and Spain), and with the participation of Russia and the USA. The SPI-ACS detector system has been provided by MPE Garching/Germany.

----- (a) INAF/IAPS-Rome (b) ICSC National Research Centre for High-Performance Computing

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