{
  "bibcode": "2017GCN.21048....1X",
  "body": "D. Xu (NAOC), Y. Qin (Geneva Obs.), Y. Zhao, J.J. Jia, H.X. Feng, Z.P. \nZhu (NAOC),  Y.D. Hu (IAA-CSIC), S. Feng, M.T. Ju (SHAO) report\n\nWe observed the field of short GRB 170428A (Beardmore et al., GCN 21042) \nusing the 2.16-m telescope located at Xinglong, Hebei, China. We \nobtained 6x300s R-band frames, starting at 19:23:21 UT on 2017-04-28 \n(i.e., 10.16 hr after the burst).\n\nNo optical source is detected at the XRT position (Beardmore & Evans, \nGCN 21047) in the stacked R-band image, down to a limiting magnitude of \nm(R)>21.0.\n\nWe note that in the SDSS and Pan-STARRS archival data there already \nexists a singe source within the XRT error circle, seemingly extended in \nthe northeast - southwest direction. It is localised at\n\nR.A (J2000) =   22:00:18.687\nDec. (J2000) = +26:54:56.51\n\nwith a brightness of m(r)~22.2 mag, and thus might be the host galaxy of \nthis short burst.",
  "circularId": 21048,
  "createdOn": 1493425861000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 170428A: Xinglong 2.16-m upper limit and host galaxy candidate",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 170428A"
}