{
  "submitter": "Alexander Moskvitin at SAO RAS <mosk@sao.ru>",
  "body": "A. Moskvitin, O. Spiridonova (SAO RAS) \nreport on behalf of GRB follow-up collaboration.\n\nWe observed the field of EP250911a (Liang et al., GCN 41788, \nEvans et al., GCN 41802) with the 1-m SAO RAS telescope \nZeiss-1000 equipped with CCD-photometer. We obtained 9 x 300 sec.\nimages in Rc band on September 11, 21:38:05--22:34:14 UT \n(t_mid - T0 = 13.12819 hours = 0.547008 days).\n\nThe OT (Quirola-Vasquez et al., GCN 41790, Angulo et al., GCN 41793;\nLai et al., GCN 41801) is clearly detected in the stacked image \nwith the brightness of R = 21.90 +/- 0.11 (R_lim = 23.0 mag).\n\nThis preliminary photometry is based on nearby SDSS stars \n(magnitudes were converted with the Lupton 2005 equations) \nand not corrected for Galactic extinction.",
  "submittedHow": "web",
  "bibcode": "2025GCN.41805....1M",
  "circularId": 41805,
  "createdOn": 1757634433143,
  "format": "text/plain",
  "eventId": "EP250911a",
  "subject": "EP250911a: SAO RAS optical observations"
}