{
  "submittedHow": "email",
  "body": "P. Minaev (IKI) , A. Pozanenko (IKI) on behalf of GRB follow-up team\n\nWe analyzed GRB 260310A (Hamburg et al., GCN 43975; Salunke et al.,\nGCN 43958; Atteia et al., GCN 43981) using publicly available data of\nGBM/Fermi. The burst consists of several emission episodes with a\ntotal duration of T_90 = 86 s. Time integrated energy spectrum,\nconstructed in the time interval (-4, 70) s since GBM trigger, is best\ndescribed by Band model with E_p = 175 keV and fluence F = 1.74e-5 erg\ncm^-2 in 1 keV - 10 MeV range. Using z = 0.153 (Hinds et al., GCN\n43977; de Ugarte Postigo et al., GCN 43984) we obtain E_iso = 9.8e50\nerg. GRB 260310A is placed above the correlation fit for type II\n(long) bursts on Ep,i – Eiso diagram, as mentioned in (Atteia et al.,\nGCN 43981), but it is inside 2 sigma correlation regions for both type\nI (short) and type II (long) bursts, therefore we cannot consider it\nas a clear outlier. Indeed, at the EH – T_90,i diagram (see [1-2] for\ndetails) GRB 260310A is well classified as type II (long) burst. The\nEp,i – Eiso and EH - T90,i diagrams can be found at\nhttps://heaiki.ru/lvc/GRB260310A/\n\n[1] - Minaev et al., MNRAS, 492, 1919, 2020\n[2] - Minaev et al., Astronomy Letters, 46, 9, 573, 2020\n",
  "subject": "GRB 260310A: classification as long GRB based on Eiso, Ep, and T_90",
  "createdOn": 1773970719900,
  "submitter": "Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>",
  "eventId": "GRB 260310A",
  "circularId": 44053,
  "bibcode": "2026GCN.44053....1M"
}