{
  "bibcode": "2019GCN.25640....1W",
  "body": "J. Y. Wei (NAOC), L. P. Xin (NAOC), S. Antier (CNRS/APC), J. Wang (GXU),\nN. Leroy (CNRS/LCL), D. Turpin (NAOC)\n\non behalf of the SVOM Multi Messenger Astronomy and GWAC teams:\nhttp://www.svom.fr/en/svom-mma-and-gwac-team\n\nWe used the 60cm SVOM/GWAC-F60A telescope to observe the transient found\nby the Zwicky Transient Facility ZTF19abvizsw (Kool et al. GCN 25616)\nlocalized in the region of the gravitational wave trigger S190901ap\n(LVC et al. GCN 25606, GCN 25614) during 17:28:07 and 18:45:07 UT on 02th,\nSep. 2019.  \n\nAfter stacking the images for 31*150 sec, the source was detected with a\nbrightness of R=20.53+/-0.16 mag calibrated by nearby USNO R2 magnitudes.\nComparing with the reported by Kool et al., GCN 25616, the source was\nfading for about one magnitude. \n\nConsidering its fast decay, a featureless  continuum superimposed \nwith a number of narrow absorption lines and the large distance of z=1.26\n(Burdge et al., GCN 25639), it is possible an orphan GRB afterglow.\n\nThe stacked image observed by GWAC-F60A is shown here,\nhttp://cmm.svom.cn/gwpub/O3/S190901ap/ZTF19abvizsw_F60_findingchart.png\n(user:svomo3 pwd:gwo3)\n\nSVOM/GWAC-F60A is a dedicated telescope for  follow-ups of SVOM/GWAC\nsystem, and is operated by Guangxi university and NAOC, CAS, at Xinglong\nobservatory, China.",
  "circularId": 25640,
  "createdOn": 1567561355000,
  "email": "xlp@nao.cas.cn",
  "subject": "LIGO/Virgo S190901ap : SVOM/GWAC-F60A observation of transient ZTFabvizsw",
  "submitter": "Liping Xin at NAOC, SVOM  <xlp@nao.cas.cn>",
  "eventId": "LIGO/Virgo S190901ap"
}