{
  "bibcode": "2015GCN.18533....1P",
  "body": "Yu. Protsyuk (RI NAO), O. Kovalchuk (RI NAO) report: \n\n  \n  \n    \n      �� \n    \n  \n  \n    We observed the field of the Swift GRB 151027A (Maselli et al. \n  \n  \n    GCN 18478) with 0.5-m telescope Mobitel KT-50 of Nikolaev observatory \n  \n  \n    with Alta-U9000 CCD-camera with R filter in robotic mode \n  \n  \n    from Oct., 28 (UTC) 20:34:16 till 20:59:59. \n  \n  \n    We obtained 19 unfiltered images of 60 s exposure and calculated \n  \n  \n    coordinates and magnitudes of all detected objects in UCAC4 system. \n  \n  \n    We don't detect any optical counterpart of GRB 151027A (Maselli et al. \n  \n  \n    GCN 18478; Zheng and Filippenko, GCN 18479) in coordinates near (J2000) \n  \n  \n    18 09 56 +61 21 12 up to ~17.2- 17.5 m . \n  \n  \n    After that we filtered all images and detected optical \n  \n  \n    counterpart��in 6 images��in coordinates (J2000) \n  \n  \n    18 09 56.680 (SD=0.s081) +61 21 12.08 (SD=0.\"63) \n  \n  \n    with brightness near 18.3m (SD=0.3m)",
  "circularId": 18533,
  "createdOn": 1446154464000,
  "email": "golov_v@ukr.net",
  "subject": "GRB 151027A: Optical counterpart detection",
  "submitter": "Valentyna Golovnya at Main Astro Obs,Kyiv  <golov_v@ukr.net>",
  "eventId": "GRB 151027A"
}