{
  "bibcode": "2019GCN.24479....1Z",
  "body": "Z.P. Zhu, D. Xu, B.Y. Yu, J.J. Ren, T.M. Zhang, X. Zhou, H.J. Wang, C.Z. \nCui, D.W. Fan, Y.F. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), \nS. Yang (INAF-OAPd), H.B. Zhao, B. Li (PMO), J.Z. Liu, H.B. Niu (XAO), \nJ.R. Mao, J.M. Bai (YNAO), report on behalf of the GWFUNC collaboration:\n\nWe observed the optical transient (OT), r = 17.3 +/- 0.1 (AB, calibrated \nagainst\nthe SDSS), in P. D'Avanzo et al. (GCN 24455) of the gravitational-wave \nevent S190510g (GCN 24442) using the Xinglong-60cm telescope located at \nXinglong, Hebei, China.\n\nThe OT is ~20\" away from the SDSS galaxy, SDSS J142914.95+094059.4, \nwhich has a photoZ=0.041 +/- 0.0149, corresponding to a luminosity \ndistance of 182.2 Mpc, thus being consistent with the LIGO's luminosity \ndistance estimate of 227 +/- 92 Mpc (GCN 24448). At the above redshift, \nSDSS J142914.95+094059.4 has an absolute magnitude of M(r) = 17.92-36.30 \n= -18.38, at the border of dwarf/normal galaxies. The OT is ~16.3 kpc \naway from the nucleus of the SDSS galaxy, much larger than usual radii \nof such galaxies. If double neutron stars are considered having been \nkicked out of their host galaxy earlier before, such a scenario might be \npossible.\n\nUnder the above assumption, we obtained 15x360 s frames in R band, \nstarted at 16:12:27 on 2019-05-10, i.e., about 10 hr after the OT \ndetected. The OT has decayed and is not detected in our stacked image of \n5400 s, down to a limiting magnitude of r ~ 20.6, calibrated with the \nSDSS field.",
  "circularId": 24479,
  "createdOn": 1557571206000,
  "email": "dxu@nao.cas.cn",
  "subject": "LIGO/Virgo S190510g : Xinglong-60cm upper limit of the GRAWITA REM's OT",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "LIGO/Virgo S190510g"
}