{
  "bibcode": "2026GCN.44975....1B",
  "subject": "GRB 260506B: cubesat Avion detection",
  "body": "From Andrey Bogomolov at Moscow State University <aabboogg@srd.sinp.msu.ru>\n\nA. Bogomolov, V. Bogomolov, A. Iyudin, S. Svertilov, N. Vasiliev\non behalf of the MSU “Sozvezdie-270” team, report:\n\nAt 2026-05-06 ~13:07:28 UT the long-duration GRB 260506B (Fermi GBM detection: GCN #44484, AstroSat CZTI detection: GCN #44503, Glowbug detection: GCN #44559) was detected by the DeCoR-3 instrument on the cubesat Avion of the Moscow University project “Sozvezdie-270” [1].\n\nTotal amount of photons detected by Avion is 428 (energy band >30 keV), it corresponds to a fluence of ~3.8*10^(-6) erg/cm^2 in the range 30-500 keV.\n\nLC in the energy range of 30-500 keV has a multiple peak structure including a faint peak of ~1 s duration at ~13:07:29 with a maximum flux of ~60 phot/(cm^2*s) and a main peak of ~5 s duration at ~13:07:40 with a maximum flux of ~80 phot/(cm^2*s) at ~13:07:42 UT.\n\nА total duration (T90) of the burst is ~15 s.\n\nThe light curve obtained by Avion is available here:\nhttps://swx.sinp.msu.ru/models/grb_cat/data/pictures/GRB260506B_LC_Avion.png\n\nParameters of GRB 260506B 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 “Sozvezdie-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",
  "submitter": "Andrey Bogomolov at Moscow State University <aabboogg@srd.sinp.msu.ru>",
  "eventId": "GRB 260506B",
  "circularId": 44975,
  "submittedHow": "email",
  "createdOn": 1781776669726
}