{
  "bibcode": "2020GCN.27003....1M",
  "body": "E. Mazaeva (IKI), A. Pozanenko (IKI), M. Krugov (AFIF),  A. Volnova \n(IKI), S. Belkin (IKI) report on behalf of IKI-FuN follow-up collaboration:\n\nWe observed  the newly discovered transient X-ray pulsar  Swift \nJ0840.7-3516 (Kennea et al., GCN 27000) initially classified as GRB \n200205A (Evans et al., GCN   26982; Niwano etal., GCN   26987;  Osborne \net al., GCN  26996). Observation of Chilescope RC-1000 started on Feb. 6 \n(UT) 02:13:56 in r'-filter. We detect optical transient (Evans et al., \nGCN 26982; Lipunov et al., GCN 26984; Melandri et al., GCN 26986; \nMalesani et al., GCN 26989).\n\nPreliminary photometry is following.\n\nDate       UT start MJD_mid     Filter Exp.  OT(AB) Err. UL\n                     (mid, days)    (s)\n\n2020-02-06 02:13:56 58885.11255 r'     5*600 19.70  0.06 22.1\n\nThe photometry is based on nearby stars of APASS catalog\nRef.stars\nAPASS_id r���        err\n45257574 15.130    0.014\n45257540 14.807    0.061",
  "circularId": 27003,
  "createdOn": 1581013891000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 200205A = Swift J0840.7-3516: optical photometry in Chilescope observatory",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 200205A"
}