{
  "bibcode": "2026GCN.44962....1B",
  "subject": "GRB 260429A: 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 2026-04-29 ~23:24:02 UT the short GRB 260429A (Fermi GBM detection: GCN #44425, GCN #44430, SVOM detection: GCN #44439, IPN triangulation: GCN #44459) 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 69 (energy band >30 keV), it corresponds to a fluence of ~6.2*10^(-7) erg/cm^2 in the range 30-500 keV.\n\nLC in the energy range of 30-500 keV is a single episode of ~0.5 sec duration with a maximum flux of ~16 phot/(cm^2*s).\n\nА total duration (T90) of the burst is less than ~0.5 s.\n\nThe light curve obtained by Avion is available here:\nhttps://swx.sinp.msu.ru/models/grb_cat/data/pictures/GRB260429A_LC_Avion.png\n\nParameters of GRB 260429A 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",
  "submittedHow": "email",
  "eventId": "GRB 260429A",
  "submitter": "Andrey Bogomolov at Moscow State University <aabboogg@srd.sinp.msu.ru>",
  "circularId": 44962,
  "createdOn": 1781685039849
}