{
  "bibcode": "2017GCN.21552....1S",
  "body": "L. P. Singer (NASA/GSFC), R. Lau (Caltech), M. M. Kasliwal (Caltech),\nD. Cook (Caltech), S. Bradley Cenko (NASA/GSFC), J. Cannizzo (NASA/GSFC),\nS. Nissanke (RU), and I. Arcavi (UCSB/Las Cumbres Obs) report on behalf of\nthe Global Relay of Observatories Watching Transients Happen (GROWTH)\ncollaboration:\n\nOn 2017 Aug 18.06 UT, we obtained near-infrared observations with the\nFLAMINGOS-2 instrument on Gemini-South of the field of the optical\ntransient candidate SSS17a (Coulter et al., GCN 21529; Allam et al., GCN\n21530; Yang et al., GCN 21531, Melandri et al., GCN 21532; etc.) that was\nreported in connection with the LIGO/Virgo candidate G298048 (LVC, GCNs\n21509, 21510, 21513).\n\nWe obtained 230 s of imaging in K_s band. A source is clearly visible at a\nposition that is consistent with the previously reported optical\ntransient. Calibrating to the 2MASS Point Source Catalog, we measure a\nK_s-band magnitude of 16.9 +/- 0.2 (Vega).\n\nIn addition to the optical transient, we also obtained K_s band imaging of\ntwo of the 13 galaxies in the Census of the Local Universe (CLU)\ncross-match with the BAYESTAR face-on localization (Cook et al., GCN\n21521). We plan to observe the remaining galaxies over the coming nights.\n\nWe thank Gemini Observatory for rapidly reviewing and awarding us\ndirectors' discretionary time under which these observations were taken.\nWe thank H. Kim and K. Silva, and the rest of the Gemini-South staff, for\npromptly executing these observations.",
  "circularId": 21552,
  "createdOn": 1503043258000,
  "email": "leo.p.singer@nasa.gov",
  "subject": "LIGO/Virgo G298048: Gemini-South Near-Infrared Photometry of the Optical Transient Candidate",
  "submitter": "Leo Singer at NASA/GSFC  <leo.p.singer@nasa.gov>",
  "eventId": "LIGO/Virgo G298048"
}