{
  "eventId": "GRB 250916A",
  "circularId": 41859,
  "submittedHow": "web",
  "body": "A. Moskvitin, O. Spiridonova (SAO RAS), A. Pozanenko (IKI), \nA. Ghosh, S. Razzaque (CAPP, University of Johannesburg),\nTao An and Yuanqi Liu (Shanghai Astronomical Observatory) \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 1-m SAO RAS \ntelescope Zeiss-1000 equipped with CCD-photometer.\nWe obtained series of 300 sec. images in BVRcIc bands on September 17, \n20:21:44--21:42:59 UT.\n\nThe OT (Belkin et al., GCN 41847; Mohan et al., GCN 41858) is clearly \ndetected in the individual and stacked frames with the brightness \nof R = 19.60 +/- 0.02 (t_mid - T0 = 1.3059 days = 31.3419 hours).\n\nPreliminary photometry is based on the nearby objects from PanSTARRS \n(magnitudes converted with Lupton 2005 equations) \nand has not corrected for the Galactic extinction.",
  "bibcode": "2025GCN.41859....1M",
  "format": "text/plain",
  "submitter": "Alexander Moskvitin at SAO RAS <mosk@sao.ru>",
  "subject": "GRB 250916A: SAO RAS optical observations",
  "createdOn": 1758151463910
}