{
  "eventId": "GRB 240805B",
  "submittedHow": "email-legacy",
  "submitter": "Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>",
  "circularId": 37072,
  "createdOn": 1722954022317,
  "subject": "GRB 240805B: AbAO, CrAO, and Terskol optical upper limits",
  "bibcode": "2024GCN.37072....1P",
  "body": " N. Pankov (HSE, IKI), A. Pozanenko (IKI), V. Rumyantsev (CrAO), R. Ya.\nInasaridze (AbAO), A. Shikherin (KIAM) report on behalf of GRB-IKI-FuN:\n\nWe observed the field of GRB 240805B detected by Swift (Williams et al,\nGCN 37043; Goad et al, GCN 37053) with AS-32 0.7-meter telescope of\nAbastumani observatory (AbAO) in R-filter, ZTSh 2.6-meter telescope of CrAO\nin R-filter, and K800 0.8-meter telescope of Terskol observatory in clear\nfilter. The observations began on 2024-08-05 at 17:30 UT at AbAO (i.e. 3.1\nhr since Swift trigger) in variable conditions. We obtain\nupper limits on the optical counterpart found and confirmed in (Moskvitin\net al, GCN 37055; Du et al, GCN 37062):\n\nDate UT start t-T0 Exp. Filter OT Err. UL Observ./Scope\n(mid, days) (s) (3-sigma)\n2024-08-05 17:30:52 0.14442 52x60 R n/d n/d 20.2 AbAO/AS-32\n2024-08-05 19:50:58 0.24449 30*120 R n/d n/d 20.5 CrAO/ZTSh\n2024-08-05 20:10:07 0.23695 44*30 CR n/d n/d 17.0 Terskol/K800\n\nThe photometry was calibrated against nearby stars of USNO-B1.0 (R2\nmagnitudes). The upper limits are in agreement with no detections by (Zhu\net al, GCN 37050; Strausbaugh et al, GCN 37052; Siegel & Williams,\nGCN 37057; Maksut et al, GCN 37060).\n"
}