TITLE: GCN CIRCULAR NUMBER: 36262 SUBJECT: LIGO/Virgo/KAGRA S240422ed: WINTER J-band upper limits on the Swift/XRT source S240422ed_X61 DATE: 24/04/23 19:01:55 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)
During WINTER follow-up observations (GCN 36248) of the LVK event S240422ed (GCN 36236, GCN 36240), we observed the location of the Swift/XRT source 61 (labeled as S240422ed_X61) at coordinates RA, Dec = 120.3245, -28.1765 ( https://gcn.gsfc.nasa.gov/other/S240422ed.counterpart) in the near-infrared J-band. Our observations of this field began at UTC 2024-04-23T03:13:34 and lasted for 480 seconds.
There are no archival J-band images of this field, so we compare the WINTER image to a y-band image from the PS1 survey (https://ps1images.stsci.edu/). We do not detect any new source within 20 arcsec of the Swift X-ray source, to a 5-sigma depth of 16.6 mag (AB). This estimate is not corrected for Galactic line-of-sight extinction (integrated E(B-V) = 0.7 mag corresponding to total A_J = 0.5 mag) along this direction.
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.
View this GCN Circular online at https://gcn.nasa.gov/circulars/36262. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...