TITLE:   GCN CIRCULAR
NUMBER:  26814
SUBJECT: LIGO/Virgo S200115j: NIR upper limits for ZTF20aafqvyc/AT2020yq from the Palomar 200-inch telescope
DATE:    20/01/18 17:39:24 GMT
FROM:    Kishalay De at Caltech, GROWTH  <kde@astro.caltech.edu>

K. De (Caltech), M. Hankins (Caltech), M. M. Kasliwal (Caltech) report
on behalf of the ZTF and GROWTH collaborations

We obtained J and Ks band imaging of ZTF20aafqvyc/AT2020yq (Anand et
al. GCN 26767) found in the localization region of LIGO/Virgo S200115j
(GCN 26759, GCN 26807) with the Wide Field Infrared Camera (WIRC;
Wilson et al. 2003) on the Palomar 200-inch telescope. We obtained a
series of dithered exposures of the target on UT 2020-01-18 for a
total exposure time of 900 s in J band and 600 s in Ks band. The data
were reduced and stacked with a custom data reduction pipeline (De et
al. 2020). No source is detected at the source location down to 5
sigma limiting magnitude of J = 21.5 AB mag and Ks = 20.9 AB mag.