{
  "body": "A. S. Moskvitin (SAO RAS), V. P. Goranskij (SAI MSU), V. V. Vlasyuk, \nV. S. Shergin, V. A. Egorov, M. A. Pritychenko, I. V. Afanasieva \n(SAO RAS), report on behalf of GRB follow-up collaboration.\n\nWe observed the field of the GRB 251002A (Saccardi et al., GCN 42060)\nwith the 1-m SAO RAS telescope Zeiss-1000 equipped with the new \nCCD-photometer. The observations started at 20:31:30 UT, ~17 minutes \nafter the trigger. \n\nThe optical transient (Palmerio et al., GCN 42061; Turpin et al., \nGCN 42062; Jelinek et al., GCN 42063; Juliá-Maroto et al., GCN 42064)\nis clearly detected in the individual images with the brightness \nof R = 17.58 +/- 0.02 (t_mid - T0 = 0.41694 hours).\n\nPreliminary photometry is based on the nearby SDSS objects \n(magnitudes converted with Lupton 2005 equations) \nand has not corrected for the Galactic extinction.\n\nThe observations with the 1-m telescope in BVRI filters \nand also with the 0.5-m telescope AS-500/2 are ongoing.\n\nWe are grateful to the SAO RAS staff for their technical support.",
  "circularId": 42065,
  "createdOn": 1759446611528,
  "bibcode": "2025GCN.42065....1M",
  "eventId": "GRB 251002A",
  "submittedHow": "web",
  "subject": "GRB 251002A: SAO RAS optical observations",
  "format": "text/plain",
  "submitter": "Alexander Moskvitin at SAO RAS <mosk@sao.ru>"
}