{
  "submitter": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
  "createdOn": 1713949316569,
  "eventId": "LIGO/Virgo/KAGRA S240422ed",
  "body": "Viraj Karambelkar (Caltech), Jacob Jencson (IPAC), Samaporn Tinyanont\n(NARIT), Mansi Kasliwal (Caltech) report on behalf of a larger\ncollaboration.\n\nWe imaged the DECam GW-MMADS source AT2024hdm (GCN 36273), reported as a\ncandidate optical counterpart to the LVK gravitational wave event S240422ed\n(GCN 36236) in the near-IR J-band with MOSFIRE on the Keck-I telescope on\nUTC 2024-04-24T07:48:25. This transient is close to a galaxy with photoz ~\n0.048 (Bilicki et al. 2014), suggesting an absolute magnitude of M_r ~ -16\nmag at discovery (GCN 36273, https://www.wis-tns.org/object/2024hdm).\n\nWe detect AT2024hdm in the J-band with m_J ~ 20.4 +/- 0.1 mag (AB). Based\non the r-band discovery magnitude,  the r - J color of this transient is ~\n0.3 mag. Correcting for Galactic extinction of E(B-V) ~ 0.1 along this\ndirection gives a corrected (r-J)_corr ~ 0.15 +/- 0.1 mag, suggesting that\nthe intrinsic color is not particularly red at this phase.\n\nThis transient may be consistent with a supernova. We encourage\nspectroscopic classification to determine the true nature of the source.\n",
  "subject": "LIGO/Virgo/KAGRA S240422ed: MOSFIRE imaging of the DECam GW-MMADS candidate AT 2024hdm",
  "submittedHow": "email-legacy",
  "circularId": 36279,
  "bibcode": "2024GCN.36279....1K"
}