GCN Circular 39117
Subject
GRB 250201A: INTEGRAL SPI/ACS detection
Date
2025-02-01T19:34:25Z (9 days ago)
From
Aishwarya L Thakur at INAF-IAPS, Rome <aishth@outlook.com>
Via
Web form
Patrizia Barria(a,b), Giulia Gianfagna(a), James Craig Rodi(a), Aishwarya Linesh Thakur(a), Lorenzo Natalucci(a,b), Luigi Piro(a) report:
GRB 250201A was discovered by Fermi/GBM (GCN 39112) on 2025-02-01T09:59:46 (UTC). We searched for a corresponding counterpart in the INTEGRAL/SPI-ACS data.
In an SPI-ACS light curve above 80 keV, we find a signal temporally coincident with the GBM detection, having an approximate duration of ~ 20 sec. The signal consists of two pulses over this duration.
The approximate peak count rate in SPI-ACS is 77,500 cts/s for E>80 keV, over a median background rate of 62,800 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.
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(a) INAF/IAPS-Rome
(b) ICSC National Research Centre for High-Performance Computing