{
  "bibcode": "2024GCN.36262....1K",
  "submittedHow": "email-legacy",
  "createdOn": 1713898915669,
  "eventId": "LIGO/Virgo/KAGRA S240422ed",
  "body": "Viraj Karambelkar (Caltech), Geoffrey Mo (MIT), Robert Stein (Caltech),\nNathan Lourie (MIT), Danielle Frostig (MIT), Tomas Ahumada (Caltech),\nRobert Simcoe (MIT), and Mansi Kasliwal (Caltech)\n\nDuring WINTER follow-up observations (GCN 36248) of the LVK event S240422ed\n(GCN 36236, GCN 36240), we observed the location of the Swift/XRT source 61\n(labeled as S240422ed_X61) at coordinates RA, Dec = 120.3245, -28.1765 (\nhttps://gcn.gsfc.nasa.gov/other/S240422ed.counterpart) in the near-infrared\nJ-band. Our observations of this field began at UTC 2024-04-23T03:13:34 and\nlasted for 480 seconds.\n\nThere are no archival J-band images of this field, so we compare the WINTER\nimage to a y-band image from the PS1 survey (https://ps1images.stsci.edu/).\nWe do not detect any new source within 20 arcsec of the Swift X-ray source,\nto a 5-sigma depth of 16.6 mag (AB). This estimate is not corrected for\nGalactic line-of-sight extinction (integrated E(B-V) = 0.7 mag\ncorresponding to total A_J = 0.5 mag) along this direction.\n\nWINTER (Wide-field INfrared Transient ExploreR) is a partnership between\nMIT and Caltech, housed at Palomar Observatory, and funded by NSF MRI, NSF\nAAG, the David and Lucille Packard Foundation, and the MIT Kavli Institute\nfor Astrophysics and Space Research.\n",
  "circularId": 36262,
  "subject": "LIGO/Virgo/KAGRA S240422ed: WINTER J-band upper limits on the Swift/XRT source S240422ed_X61",
  "submitter": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>"
}