{
  "bibcode": "2015GCN.18113....1M",
  "body": "K. L. Murata (Nagoya U.), T. Kusune (Nagoya City U.), H. Onozato (Tohoku U.) and T. Nagayama (Kagoshima U.)\n\nWe observed the field of GRB 150727A (Cenko et al., GCN Circular #18076) with the near-infrared (J, H, Ks) simultaneous imaging polarimeter SIRPOL attached to 1.4 m telescope IRSF (InfraRed Survey Facility) in Sutherland observatory, South Africa.\n\nThe observations started on 2015-07-27 19:25:30 UT (~ 9 min. after the burst).\nWe detected an uncatalogued source within 5 arcsec from the Swift/UVOT preliminary position reported in the GCN circular of Breeveld et al. (GCN Circular #18084).\nWe have obtained the following preliminary magnitude (Vega magnitude system):\n\nJ   = 18.9 +- 0.2\nH   = 18.1 +- 0.1\nKs  = 17.1 +- 0.2\n\nGiven magnitudes were calibrated against 2MASS point sources in this field.\n\nThis observation was carried out by IRSF and OISTER collaboration.",
  "circularId": 18113,
  "createdOn": 1438677932000,
  "email": "dikuroda@oao.nao.ac.jp",
  "subject": "GRB 150727A: IRSF NIR observation",
  "submitter": "Daisuke Kuroda at OAO/NAOJ  <dikuroda@oao.nao.ac.jp>",
  "eventId": "GRB 150727A"
}