{
  "bibcode": "2025GCN.41870....1M",
  "eventId": "GRB 250916A",
  "createdOn": 1758209998611,
  "circularId": 41870,
  "subject": "GRB 250916A: further SAO RAS optical observations",
  "format": "text/plain",
  "body": "A. Moskvitin (SAO RAS), A. Pozanenko (IKI), N. Pankov (HSE, IKI)\nreport on behalf of GRB follow-up collaboration and IKI-GRB-FuN.\n\nWe observed the field of the GRB 250916A (Fermi GBM team, GCN 41839; \nArya et al., GCN 41843; Cheung et al., GCN 41855) with the BTA, \n6-m telescope of SAO RAS equipped with SCORPIO-1 focal reducer.\nWe obtained 3 x 60 sec. images in Rc band  under mediocre weather \nconditions on September 18, 00:07:09--00:15:29 UT \n(t_mid - T0 = 1.4458 days = 34.6994 hours).\n\nThe OT (Belkin et al., GCN 41847; Mohan et al., GCN 41858; \nBurkhonov et al., GCN 41860) at the redshift z = 2.015 \n(de Ugarte Postigo et al., GCN 41863) is clearly detected \nin the stacked frame with a brightness of R = 19.72 +/- 0.05.\n\nThe preliminary photometry is based on PanSTARRS data on nearby\nobjects (magnitudes calculated using the Lupton 2005 transformations)\nand does not take into account Galactic extinction.",
  "submitter": "Alexander Moskvitin at SAO RAS <mosk@sao.ru>",
  "submittedHow": "web"
}