{
  "circularId": 39518,
  "submitter": "Aishwarya L Thakur at INAF-IAPS, Rome <aishth@outlook.com>",
  "subject": "EP250226a/GRB 250226A: INTEGRAL SPI-ACS and PICsIT detection",
  "bibcode": "2025GCN.39518....1T",
  "createdOn": 1740666671746,
  "eventId": "EP250226a",
  "submittedHow": "web",
  "format": "text/plain",
  "body": "Aishwarya Linesh Thakur(a), James Craig Rodi(a), Patrizia Barria(a,b), Giulia Gianfagna(a), Luigi Piro(a), Lorenzo Natalucci(a,b) report:\n\nEP250226a/GRB 250226A was discovered by Fermi/GBM (GCN 39479) and EP-WXT (GCN 39482) at 2025-02-26T06:34:57 (UTC) and has also been detected by GECAM-B (GCN 39492)\n\nIn a SPI-ACS light curve above 80 keV, we find a signal temporally coincident with the GBM and EP-WXT detections, having an approximate duration of ~ 15 sec. The signal consists of a single pulse over this duration. This signal is also detected marginally in the IBIS/PICsIT data. \n\nThe approximate peak count rate in SPI-ACS is 74,000 cts/s for E>80 keV, over a median background rate of 67,600 cts/s. \n\nThis 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.\n\n-----\n(a) INAF/IAPS-Rome\n(b) ICSC National Research Centre for High-Performance Computing\n"
}