{
  "bibcode": "2019GCN.24328....1M",
  "body": "K. Morihana (Nagoya U.), M. Jian (U. of Tokyo), T. Nagayama (Kagoshima\nU.) on behalf of J-GEM collaboration\n\nWe carried out NIR photometric follow-up observation of Swift/UVOT\ntransient (Breeveld et al.,GCN 24296) of the GW event S190425z (GCN\n24168) with the near-infrared (J, H, Ks) simultaneous imaging camera\nSIRIUS attached to the IRSF (InfraRed Survey Facility) 1.4 m telescope\nin Sutherland Observatory, South Africa.\n\nThe observation started on 2019-04-28 00:44:28 UT. The exposure time\non the source is 40 min. A very faint source (possibly noise) is seen\nat the position of Swift/UVOT transient in the J-band image. The\nsimple aperture photometry returns J=20.2 mag (Vega system), but it is\nquite unsure. The conservative upper limit magnitudes for the\nJHKs-band images are 18.8 mag, 18.4 mag, and 16.9 mag (Vega system),\nrespectively.",
  "circularId": 24328,
  "createdOn": 1556457344000,
  "email": "morihana@u.phys.nagoya-u.ac.jp",
  "subject": "LIGO/Virgo S190425z : IRSF/SIRIUS NIR photometric follow-up observation of the Swift/UVOT Transient",
  "submitter": "Kumiko Morihana at Nagoya University  <morihana@u.phys.nagoya-u.ac.jp>",
  "eventId": "LIGO/Virgo S190425z"
}