{
  "submittedHow": "email-legacy",
  "body": "S. Belkin (HSE, IKI), R. Ya. Inasaridze (AbAO), A. Pozanenko (IKI), N.\nPankov (HSE, IKI) report on behalf of GRB-IKI-FuN:\n\nWe observed the field of EP240913A/GRB 240913C (Li et al., GCN 37492; Yin\net al., GCN 37493; Dasgupta et al., GCN 37505; Bissaldi et al., GCN 37509;\nPawar et al., GCN 37510) using the 70-cm AS-32 telescope at the Abastumani\nObservatory (AbAO) in the R-filter, starting on 2024-09-14 at 23:44:17\n(UT). We did not detect the optical counterpart in the stacked image within\nthe Swift-XRT error circle (Jiang et al., GCN 37497), consistent with\nreports from Asquini et al., GCN 37499; Zhu et al., GCNs 37500, 37501;\nZheng et al., GCN 37511; Schneider et al., GCN 37515; Lipunov et al., GCN\n37521. Preliminary photometry is as follows:\n\nDate UT Start t-T0 (days) Filter Exposure (s) OT Err UL (3σ)\n2024-09-14 23:44:17 1.53211 R 113×60 n/d n/d 22.2\n\nThe magnitudes were calibrated using nearby USNO-B1.0 stars:\nRA: 01:06:52.7994912, DEC: +16:43:24.121128, R2: 15.96\nRA: 01:07:11.4427176, DEC: +16:49:54.951564, R2: 17.09\n",
  "eventId": "GRB 240913C",
  "bibcode": "2024GCN.37584....1B",
  "submitter": "Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>",
  "subject": "EP240913A/GRB 240913C: AbAO optical upper limit",
  "createdOn": 1726914805967,
  "circularId": 37584
}