{
  "eventId": "GRB 250704B",
  "subject": "GRB 250704B / EP250704a: Mondy and AbAO optical observations",
  "submittedHow": "email",
  "createdOn": 1751977575760,
  "circularId": 41024,
  "submitter": "Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>",
  "body": " A. Volnova (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), R. Ya. Inasaridze\n(AbAO), N. Pankov (HSE) report on behalf of GRB IKI FuN:\n\nWe observed the field of the EP250704a (Li et al., GCN 40941) also detected\nby SVOM (GRB 250704B; Wang et al., GCN 40940) with AZT-33IK telescope of\nMondy observatory in R-filter on 2025-07-05 and with AS-32 telescope of\nAbastumani observatory on 2025-07-05. The optical afterglow (Li et al.,\nGCNs 40941; Schneider et al., GCN 40942; Malesani et al., GCN 40945; Brivio\net al., GCN 40947; Evans et al., GCN 40951; Perez-Garcia et al., GCN 4957;\nGillanders et al., GCN 40958; Xin et al., GCN 40960; Mohan et al., GCN\n40962; Moskvin et al., GCN 40963; Liu et al., GCN 40965; An et al., GCN\n40966; Yang et al., GCN 4970; Martin-Carillo et al., GCN 40971; Frederiks\net al., GCN 40972,Malte Busmann et al., GCN 40974, Li et al., GCN40975, Li\net al., GCN 40986; An et al., GCN 40993; Wang et al., GCN 40999).\n\nWe detect the afterglow  on 2025-07-05. Preliminary photometry of a stacked\nimage is the following\n\nDate UT start t-T0 Exp. Filter OT Err. UL(3sigma) Tel.\n(mid, days) (s)\n\n2025-07-05|16:34:49| 1.36693| 30*120 |R|21.06 |0.05| 22.9 |AZT-33IK\n2005-07-06|19:39:17| 2.51241| 52*60 |R|n/d |- | 21.2 |AS-32\n\nThe photometry is based on nearby reference stars from PS1 (Lupton\ntransformations)\n\nRA Dec R_Lupton\n20:03:37.87 +12:01:59.6 17.385\n20:03:26.50 +12:02:18.5 17.436\n20:03:24.72 +11:59:09.1 16.41\n",
  "bibcode": "2025GCN.41024....1V"
}