{
  "bibcode": "2024GCN.37922....1M",
  "circularId": 37922,
  "submitter": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
  "body": "A. S. Moskvitin, A. S. Vinokurov, O. I. Spiridonova (SAO RAS),\nA. S. Pozanenko (IKI) report on behalf of the GRB follow-up team.\n\nWe observed the field of GRB 241026A (The Fermi GBM team, GCN 37894;\nMelandri et al., GCN 37896, Li et al., GCN 37909) with the BTA,\n6-m telescope of SAO RAS (equipped with the focal reducer Scorpio-I\nand V, Rc filters) and also with the 1-m telescope of SAO RAS,\nZeiss-1000 (equipped with the CCD-photometer and Rc filter)\non October 27.\n\nThe OT (Moskvitin et al., GCNs 37899, 37916; Watson et al., GCN 37900;\nZheng & Filippenko GCN 37903; Shrestha et al., GCN 37913; Mo et al.,\nGCN 37915; Mohan et al., GCN 37918) is clearly detected in our stacked\nframes with the following brightness:\n\nUT_start--UT_end   t_mid-T0  exp, s  R magnitude     R_lim  telescope\n18:37:41--18:41:24 0.8313 d  4 x 20  21.24 +/- 0.09  23.7   BTA\n18:47:40--19:31:31 0.8521 d  8 x 300 21.23 +/- 0.11  23.8   Zeiss-1000\n\nThe frames were calibrated against nearby USNO-B1 stars\n(R2 magnitudes) and not corrected for MW extinction.\n\n",
  "createdOn": 1730082559709,
  "submittedHow": "email-legacy",
  "eventId": "GRB 241026A",
  "subject": "GRB 241026A: BTA and Zeiss-1000 optical observations"
}