{
  "circularId": 38762,
  "bibcode": "2025GCN.38762....1M",
  "body": "A. S. Moskvitin and O. I. Spiridonova (SAO RAS), \nreport on behalf of the GRB follow-up team.\n\nWe observed the field of Swift GRB 250101A (Page et al., GCN 38752) \nwith the 1-m telescope of SAO RAS, Zeiss-1000 + CCD-photometer. \nOn January 1, 16:18:20--16:51:10 UT (t_mid - T0 = 3.1986 hours)\nwe obtained first set of 6 x 300 sec. images in Rc band. \nAt 18:43:29--18:59:33 UT (t_mid - T0 = 5.4781 hours) \nwe obtained second set of data, 3 x 300 sec. images in Rc band.\n\nThe OT (Page et. al., GCN 38752; Li et al., GCN 38753; Mohan et al., \nGCN 38754; Zhu et al., GCN 38755, GCN 38759; Budnev et al., GCN 38756;\nWU et al., GCN 38758) is clearly detected in our stacked frames \nwith the brightness of R = 19.76 +/- 0.01 (t_mid - T0 = 3.1986 hours)\nand R = 19.84 +/- 0.02 (5.4781 hours), calibrated against nearby PS1 \nstars (magnitudes were converted with the Lupton 2005 equations \nand not corrected for the MW extinction).\n\nObservations are ongoing.",
  "submitter": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
  "createdOn": 1735759235776,
  "eventId": "GRB 250101A",
  "submittedHow": "web",
  "format": "text/plain",
  "subject": "GRB 250101A: SAO RAS optical observations"
}