TITLE: GCN CIRCULAR NUMBER: 36248 SUBJECT: LIGO/Virgo/KAGRA S240422ed: WINTER near-infrared J-band observations DATE: 24/04/23 08:10:26 GMT FROM: Viraj Karambelkar at Indian Inst of Tech,Bombay karambelkarvraj21197@gmail.com
Viraj Karambelkar (Caltech), Geoffrey Mo (MIT), Robert Stein (Caltech), Nathan Lourie (MIT),
Danielle Frostig (MIT), Tomas Ahumada (Caltech), Robert Simcoe (MIT), and Mansi Kasliwal (Caltech)
We observed the localization region of the LVK trigger S240422ed (GCN 36236) with the 1.2 sq. degree WINTER camera on the Palomar 1-m telescope (Lourie et al. 2021). We obtained images in the near-IR J-band of the Bilby sky map (GCN 36240). Our observations began at 2024-04-23T03:04 UTC, ~5.5 hours after the GW event time, and lasted for ~2.5 hours.
Our observations covered ~14% of the localization probability, and achieved a 5-sigma depth ranging between m_J = 16 - 17 mag (AB) depending on the sensor temperature. The observations have been reported to TreasureMap (Wyatt et al. 2020).
The images were processed through the WINTER data reduction pipeline implemented using mirar (https://github.com/winter-telescope/mirar, https://doi.org/10.5281/zenodo.10888436). We cross-matched all sources with the alert stream from the Zwicky Transient Facility (GCN 36246). We found 153 candidates and rejected them as variable stars. Further analysis is underway.
WINTER (Wide-field INfrared Transient ExploreR) is a partnership between MIT and Caltech, housed at Palomar Observatory, and funded by NSF MRI, NSF AAG, the David and Lucille Packard Foundation, and the MIT Kavli Institute for Astrophysics and Space Research.
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