TITLE: GCN CIRCULAR NUMBER: 38627 SUBJECT: EP 241217a: NIR detection with P200/WIRC DATE: 24/12/18 21:10:18 GMT FROM: Viraj Karambelkar at Indian Inst of Tech,Bombay karambelkarvraj21197@gmail.com

Viraj Karambelkar (Caltech), Tomas Ahumada (Caltech), and Mansi Kasliwal (Caltech) report:

We observed the location of EP 241217a (Zhou et al., GCN 38586;) in the NIR J-band and Ks-band with the Wide-Field Infrared Camera (WIRC, Wilson et al. 2003) on the 200-inch Hale telescope at Palomar Observatory. Observations began on 2024-12-18 01:40:00 UT (approx. 20 hours after the EP detection), and comprise a series of 36 x 45 s exposures in the J-band and 17 x 30 s in the K-band.

We detect a possible source at the Gemini counterpart location (Levan et al., GCN 38587; Fan et al. GCN 38592; Levan et al. GCN 38593). We measure a brightness of J ~ 20.7 +/- 0.1 mag (AB) and K ~ 19.3 +/- 0.1 mag (AB). We thank Héctor Arce and the P200 staff for granting the observations.

We subsequently observed this transient with NIRES (Wilson et al. 2004) on the Keck II telescope starting 2024-12-18 05:00:00 UT. We thank Michael Lui, and the Keck staff for facilitating the observations.

View this GCN Circular online at https://gcn.nasa.gov/circulars/38627. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...