{
  "eventId": "GRB 250226B",
  "bibcode": "2025GCN.39519....1R",
  "createdOn": 1740666737935,
  "format": "text/plain",
  "submitter": "Aishwarya L Thakur at INAF-IAPS, Rome <aishth@outlook.com>",
  "subject": "GRB 250226B: INTEGRAL SPI-ACS and PICsIT detection",
  "body": "James Craig Rodi(a), Aishwarya Linesh Thakur(a), Patrizia Barria(a,b), Giulia Gianfagna(a), Lorenzo Natalucci(a,b), Luigi Piro(a), report:\n\nGRB 250226B was discovered by Fermi/GBM (GCN 39503) at 2025-02-26T22:30:23 (UTC).\n\nIn a 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 multiple pulses over this duration. The strongest pulse of this signal is also detected in the IBIS/PICsIT data. \n\nThe approximate peak count rate in SPI-ACS is 95,000 cts/s for E>80 keV, over a median background rate of 63,000 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",
  "submittedHow": "web",
  "circularId": 39519
}