TITLE:   GCN CIRCULAR
NUMBER:  33648
SUBJECT: GRB 230414B: Nickel and KAIT telescope optical observations
DATE:    23/04/18 17:53:50 GMT
FROM:    Weikang Zheng at UC Berkeley <weikang@berkeley.edu>

Sophia Risin, Ivan Altunin, Colin Rushing, WeiKang Zheng and

Alex Filippenko (UC Berkeley) report on behalf of the KAIT GRB team:


We observed the field of GRB 230414B (D'Ai et al., GCN 33612) with

the 1-m Nickel and 0.76-m KAIT telescopes located at Lick observatory,

California. Observations started about 0.57 days after the burst.

A total of 6 images (600s exposure each) in R band were taken with Nickel

telescopes, while KAIT images were taken in clear band, with 60s exposure

and coadded. We clearly detected the optical afterglow

(Pankov et al., GCN 33615; Lu et al., GCN 33616; Raman et al., GCN 33618;

Ghosh et al., GCN 33620; Moskvitin et al., GCN 33622; Malesani et al., GCN

33623; Zhu et al., GCN 33625; Belkin et al., GCN 33628; Fernandez et al.,

GCN 33629; Quadri et al., GCN 33630; Leonini et al., GCN 33634; Ror et al.,

GCN 33636; Querrard et al., GCN 33637; Ruocco, GCN 33641; LaPorte et al.,

GCN 33642) and measure the following magnitude calibrated to the Pan-STARRS1

catalog:


t-t0(days) filter mag   err

0.57       clear  19.6  0.1

0.64       R      19.7  0.1

0.72       clear  20.0  0.2