{
  "bibcode": "2025GCN.40131....1B",
  "submittedHow": "web",
  "subject": "GRB 250320B: cubesat Avion detection",
  "format": "text/plain",
  "body": "A. Bogomolov, V. Bogomolov, A. Iyudin, S. Svertilov, N. Vasiliev \non behalf of the MSU “Sozvezdie-270” team, report:\n\nAt 2025-03-20 ~23:15:22 UT the long-duration GRB 250320B (Fermi GBM detection: GCN #39792; SVOM detection: GCN #39813, AstroSat CZTI detection: GCN #39808) was detected by the DeCoR-1 instrument on the cubesat Avion of the Moscow University project “Constellation-270” [1].  \n\nTotal amount of photons detected by Avion is 1350 (energy band 40-500 keV), it corresponds to a fluence of ~6*10^(-6) erg/cm^2 in the range 40-500 keV.\n\nLC in the energy range of 40-500 keV has two main episodes with a maximum flux of ~5.8 phot/(cm^2*s) in the 1st peak with a duration of ~13 s, and ~5.2 phot/(cm^2*s) in the 2nd peak with a duration of ~11 s.\n\nА total duration (T90) of the burst is ~78 s.\nThe light curve obtained by Avion is available here:\nhttps://swx.sinp.msu.ru/models/grb_cat/data/pictures/GRB20250320_Avion_DeCoR1_s.png\n\nParameters of GRB 250320B as well as other GRBs detected by Moscow University cubesats are listed at: https://swx.sinp.msu.ru/models/grb_cat/grb.php?lang=en\n\nAvion is one of 5 cubesats of the Moscow University project “Constellation-270” [1] launched on 2023 June 27. The payload of Avion is a set of scintillation gamma-ray detectors DeCoR [2], the energy range is >30 keV, the time resolution is 0.5s. \n\n[1] Svertilov et al. 2023  https://link.springer.com/chapter/10.1007/978-3-031-50248-4_21\n[2] Bogomolov et al. 2022 Universe 8, 282 https://www.mdpi.com/2218-1997/8/5/282\n\n",
  "circularId": 40131,
  "createdOn": 1744274800239,
  "eventId": "GRB 250320B",
  "submitter": "Andrey Bogomolov at Moscow State University <aabboogg@srd.sinp.msu.ru>"
}