{
  "bibcode": "2015GCN.17815....1M",
  "body": "E. Mazaeva (IKI), V. Rumyantsev (CrAO),  A. Pozanenko (IKI) report on \nbehalf of larger GRB follow-up collaboration:\n\nWe observed the two OT candidates (Singer et al., GCN 17809)  of the \nFermi GRB  150512A (Zhang et al., GCN 17811) with ZTSh telescope of CrAO \nobservatory starting on May. 13 (UT) 21:04:53. Both candidats are \nclearly visible in our images. Photometry of the candidates is following\n\niPTF15asn:\nDate       UT start   t-T0     Filter   Exp.    Source    Err.\n                       (mid, days)       (s)\n2015-05-13 21:04:53   1.45795  R        16*120  19.20     0.03\n\n\niPTF15asm:\nDate       UT start   t-T0     Filter   Exp.    Source    Err.\n                       (mid, days)       (s)\n2015-05-13 21:46:49   1.48417  R        12*120  19.40     0.02\n\nPhotometry of iPTF15asm might be biased by nearby galaxy SDSS \nJ134044.09+631954.4. However both sources do not fade in comparison with \nearly observations (Singer et al., GCN 17809) and most probably cannot \nbe considered as afterglow.\n\nPhotometry is in Vega, and based on following SDSS stars\n\nSDSS9_id               R_Lupton\nJ135741.63+650759.8    16.82\nJ135738.44+650852.4    18.03\nJ135752.58+650922.2    18.14",
  "circularId": 17815,
  "createdOn": 1431631818000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 150512A: CrAO optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 150512A"
}