{
  "subject": "GRB 251129A / EP251129a: SAO RAS optical observations",
  "createdOn": 1764439189692,
  "submittedHow": "web",
  "bibcode": "2025GCN.42897....1M",
  "body": "A. S. Moskvitin and O. I. Spiridonova (SAO RAS) \nreport on behalf of GRB follow-up team.\n\nWe observed the field of the SVOM GRB 251129A (Tan et al., GCN 42877)\nalso detected by Einstein Probe as EP251129a (Wu et al., GCN 42884)\nand Swift (Evans, GCN 42888; Page et al., GCN 42891) \nwith the Zeiss-1000 1m telescope of the SAO RAS on November 29, \n15:27:01--16:00:22 UT (t_mid - T0 = 0.54973 days). We obtained \n6 * 300 sec images in Rc band.\n\nThe optical afterglow (Angulo et al., GCN 42880; Wu et al., GCN 42882; \nWatson, GCN 42883; Masi, GCN 42885; Li et al., GCN 42887; \nLipunov et al., GCN 42892) is clearly detected in the stacked frame \nwith the following brightness.\n\nDate        UT start  t-T0       Exp.    Filter  OT     Err.  UL      \n                     (mid,days)  (n*s)                       (3sigma)\n\n2025-11-29  15:27:01  0.54973    6*300   Rc      21.00  0.07  22.8\n\nThis preliminary photometry is based on nearby stars from the USNO-B1 \ncatalogue (R2 magnitudes) and is not corrected for the Galactic \nextinction.",
  "format": "text/plain",
  "submitter": "Alexander Moskvitin at SAO RAS <mosk@sao.ru>",
  "circularId": 42897,
  "eventId": "GRB 251129A"
}