{
  "bibcode": "2019GCN.24187....1D",
  "body": "K. De (Caltech), S. M. Adams (Caltech), M. Coughlin (Caltech), M. M.\nKasliwal (Caltech), M. Hankins (Caltech), I. Andreoni (Caltech), S. Anand\n(Caltech), L. Singer (NASA GSFC), , T. Ahumada (UMD),  A. Moore (ANU), J.\nSoon (ANU), M. Ashley (UNSW), T. Travouillon (ANU)\n\nreport on behalf of the Palomar Gattini-IR team and the larger GROWTH\n(Global Relay of Observatories Watching Transients Happen) collaboration\n\nWe report wide-field near-infrared follow-up observations of the\nlocalization region of the BNS gravitational wave event S190425z (GCN\n24168) by the Palomar Gattini-IR survey (Moore and Kasliwal 2019).\nGattini-IR is a newly commissioned near-IR camera with a field of view of\n25 square degrees mounted on a robotic 30 cm telescope at Palomar\nobservatory.\n\nGattini-IR was already observing the GW localization region as part of\nroutine survey operations at the time of the trigger. We started customized\nTarget of Opportunity observations at UT 2019-04-25 09:12:09 (11 minutes\nafter initial notice time). The tiling was optimally determined and\ntriggered using the GROWTH Target of Opportunity marshal (Coughlin et al.\n2019a, Kasliwal et al. 2019b). We imaged a total of 2401 square degrees,\ncovering 31% of the probability region of the event. Each field visit\nconsisted of a sequence of 8 dithers of 8 second exposures each on the\nfield, which were processed and stacked with the Palomar Gattini-IR data\nreduction pipeline (De et al., in prep.). The typical limiting magnitude of\neach stacked epoch (64 second exposure time) was between 15.5 - 16 AB mag\nin J-band. Transient vetting is ongoing and any viable counterparts will be\nannounced.",
  "circularId": 24187,
  "createdOn": 1556208433000,
  "email": "mansikasliwal@gmail.com",
  "subject": "LIGO/Virgo S190425z: Palomar Gattini-IR wide-field infrared follow-up",
  "submitter": "Mansi M. Kasliwal at Caltech/Carnegie  <mansikasliwal@gmail.com>",
  "eventId": "LIGO/Virgo S190425z"
}