{
  "bibcode": "2015GCN.18097....1M",
  "body": "E. Mazaeva (IKI), I. Reva (Fesenkov Astrophysical Institute),   A. \nVolnova (IKI), A. Pozanenko  (IKI) report on behalf of larger GRB \nfollow-up collaboration:\n\nWe observed the field of the Swift GRB 150728A (Krimm et al. GCN 18087) \n   with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical \nObservatory starting on Jul. 29 (UT) 18:34:50.  We obtained several \nimages in R-filter.  In a combined image we do not detect the FTN object \n(Dichiara et al. GCN 18090) also visible in AAO observations (Mazaeva et \nal., GCN 18094) and source A in RATIR observations (Watson  et al., GCN \n18096).\nA photometry of the field is following\n\nDate       UT start    t-T0     Filter  Exp.     ULimit (3sigma)\n                        (mid, days)      (s)\n\n2015-07-29 18:34:50    1.26425  R       15*300   21.2\n\nThe photometry is based on nearby USNO-B1.0 stars\nUSNO-B.1_id  R2\n1239-0338943 17.06\n1239-0338998 16.69\n\nAlso we marginally detect object B of the  RATIR observations (Watson \net al., GCN 18096) in our current and previous observation of the field \n(Mazaeva et al., GCN 18094).\n\nThe finding chart can be found in \nhttp://grb.rssi.ru/GRB150728A/GRB150728A_AAO_left_TSHAO_right.png\n\nWould the source A be a  non-variable point like object with magnitudes \nof  r=21.37+/-0.04 and   i=20.89+/-0.04 (Watson  et al., GCN 18096) in \nour observation the object A might be detected  as the object with a \nmagnitude less than R=21.3 (3 sigma). So we tentatively suggest the \nobject A as an afterglow candidate.",
  "circularId": 18097,
  "createdOn": 1438281670000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 150728A: TSHAO optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 150728A"
}