TITLE:   GCN CIRCULAR
NUMBER:  36103
SUBJECT: GRB240414A : J-band upper limits from WINTER
DATE:    24/04/14 22:55:41 GMT
FROM:    Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>

Viraj Karambelkar (Caltech), Tomas Ahumada (Caltech), Geoffrey Mo (MIT),
Danielle Frostig (MIT), Robert Stein (Caltech), Nathan Lourie (MIT), Robert
Simcoe (MIT), Mansi Kasliwal (Caltech)



We observed the field of the GRB 240414A (GCN #36084, #36083, #36087, #36088,
#36093, #36095, #36097, #36100, #36101) in the near-infrared J-band with
the Palomar 1-m telescope, equipped with the 1 square degree WINTER camera
(Lourie et al. 2020).

Our observations started at UTC 2024-04-14T20:16:20 (MJD 60414.45) and
lasted a total of 50 minutes. The images were processed through the WINTER
data reduction pipeline implemented using mirar (
https://zenodo.org/records/10888437), with image subtraction performed
relative to reference images built from the UKIRT Hemisphere Survey (Dye et
al. 2017).

We do not detect the optical counterpart reported by GCN #36084, #36085,
#36097, #36101 in the J-band WINTER images, and derive a limiting mag. of J
~ 19 mag (AB).

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