{
  "body": "N. Pankov (HSE, IKI)  A. V. Samokhvalov (citizen scientist, Surgut), \nA. Pozanenko (IKI), S. Belkin (IKI, HSE)   report on behalf of GRB IKI FuN:\n\nWe observed the field of GRB 230818A (Swift: Tohuvavohu et al., GCN 34479; Fermi:  GBM team, GCN 34478) with 25cm telescope of KGO observatory. Observation started on 2023-08-18 23:42:15, i.e. 14.5 minutes after GRB trigger. The series consist of images with an exposure of 600 s in R-filter. WE clearly detect the afterglow (Lipunov et al., GCN 34476; Gompertz et al., GCN  34480; Moskvitin et al., GCN 34483; Malesani  et al., GCN 34485; Siegel et al., GCN 34486). Preliminary photometry of  images is following\n\nDate UT-start       Exptime Filter t-T0      OT     Err    UL\n                    sec            days\n2023-08-18 23:42:15 1*600   R      0.013667  18.7   0.2    19.3\n2023-08-18 23:52:24 6*600   R      0.038080  19.8   0.3    19.9\n\nRef.stars\nPanSTARRS-DR1\nRA Dec r i R(Lupton transformation)\n19:03:22.0694 +40:55:31.814 14.1600 14.0074 13.97\n19:04:17.2714 +40:50:28.744 14.8986 14.7352 14.71\n\n",
  "subject": "GRB 230818A: KGO RC-25 optical observations",
  "circularId": 34487,
  "bibcode": "2023GCN.34487....1P",
  "submitter": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
  "createdOn": 1692439560353,
  "eventId": "GRB 230818A",
  "submittedHow": "email-legacy"
}