GCN Circular 39331
Subject
EP250215A/GRB 250215A: INTEGRAL SPI-ACS detection
Date
2025-02-15T07:50:45Z (7 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), Luigi Piro(a), Lorenzo Natalucci(a,b) report:
GRB 250215A was discovered by Fermi/GBM (GCN 39327) at 2025-02-15T02:31:54 (UTC) and Einstein Probe/WXT (GCN 39329) at 2025-02-15T02:32:03 (UTC).
In an SPI-ACS light curve above 80 keV, we find a signal temporally coincident with the GBM detection, having an approximate duration of ~ 18 sec. The signal consists of three pulses over this duration. Our detection confirms that GRB 250215A and EP250215A are the same event.
The approximate peak count rate in SPI-ACS for E>80 keV is 68,000 cts/s, over a median background rate of 64,458 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