TITLE:   GCN CIRCULAR
NUMBER:  37213
SUBJECT: GRB 240819A: KAIT optical upper limit
DATE:    24/08/21 02:16:36 GMT
FROM:    Weikang Zheng at UC Berkeley <weikang@berkeley.edu>

WeiKang Zheng, Alexei V. Filippenko (UCB) and S. Antier (OCA),


SVOM JSWG: Jian-Yan Wei (NAOC, China), Bertrand Cordier (CEA, F),

Shuang-Nan Zhang (IHEP, CN), Stephane Basa (LAM, F), Jean-Luc Attéia

(IRAP, F), Arnaud Claret (CEA, F), Zi-Gao Dai (USTC, CN), Frederic Daigne

(IAP, F), Jin-Song Deng (NAOC, CN), Andrea Goldwurm (APC, F),

Diego  Götz (CEA, F), Xu-Hui Han (NAOC, CN), Cyril Lachaud (APC, F),

En-Wei Liang (GXU, CN), Yu-Lei Qiu (NAOC, CN), Susanna Vergani

(Obs. Paris, F), Jing Wang (NAOC, CN), Chao Wu (NAOC, CN), Li-Ping Xin

(NAOC, CN), Bing Zhang (UNLV, CN)


report on behalf of the KAIT GRB team:


The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at

Lick Observatory, responded to GRB 240819A from the SVOM/ECLAIRs

trigger sb24081901 (Coleiro et al., GCN 37208) starting at 03:49

UT, Aug 19th, ~1.23 hours after the trigger. Observations were

performed in 3x3 tiling mode and lasted for about 6 hours, a set

of clear (roughly R) filter images were obtained. The location of

the 4 X-ray sources, two from Swift XRT (Evans et al., GCN 37203)

and two additional ones from EP/FXT (Li et al., GCN 37206) were all

covered in our images. Preliminary analysis do not reveal any new

optical counterpart candidate within the X-ray error circles,

neither in single image, nor in the co-add images, consistent with

the reports from Jiang et al. (GCN 37207). The typical limiting

magnitude of our single clear image is about 19.5 mag calibrated to

the Pan-STARRS1 catalog.