{
  "bibcode": "2023GCN.34867....1B",
  "submittedHow": "email-legacy",
  "eventId": "GRB 231017A",
  "circularId": 34867,
  "createdOn": 1697887339155,
  "body": "S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), N. Pankov (HSE) report on behalf of GRB IKI FuN:\n\nWe observed the field of GBM/Fermi and Swift/BAT-GUANO candidate of GRB 231017A (Fermi GCM Team GCN 34822; Mangan et al. 2023, GCN 34830; DeLaunay et al. 2023, GCN 34824; GCN 34825)  with AZT-33IK telescope of Mondy observatory  in  R-filter on 2023-10-20 starting (UT) 18:02:43. We detect only one object within Swift-XRT X2 candidate error circle (Dichiara et al. GCN 34829) at coordinates of (J2000)  05:44:40.6245 +56:44:54.767. The object position is 5.3 arcsec apart from  Swift-XRT center of the XRT X2 error circle. However, at the moment we cannot say about the variability of the object. \nWe may propose the object as a candidate for an afterglow or host galaxy of GRB 230420A. \n\nPreliminary photometry  of the object is following\n\nDate       UT start  t-T0     Exp.  Filter   OT     Err.  UL(3sigma)\n                   (mid, days)  (s)\n2023-10-20 18:02:43  3.43519  29x120 R       22.98  0.20   23.5\n\nThe photometry is based on nearby USNO-B1.0 R2 stars\nUSNO-B1.0\nRA DEC R2\n05:44:36.1893600 +56:44:30.523200 15.96\n05:44:49.0394400 +56:45:26.060400 16.24\n05:44:55.8448800 +56:45:12.002400 16.30\n05:44:44.9767200 +56:47:48.480000 16.48\n\n",
  "submitter": "XXXX at IKI <alex@cgrsmx.iki.rssi.ru>",
  "subject": "GRB 231017A: Mondy optical observations. A possible candidate for an afterglow or host galaxy."
}