TITLE:   GCN CIRCULAR
NUMBER:  19358
SUBJECT: LSGT observation of GRB 160425A
DATE:    16/04/28 07:59:24 GMT
FROM:    Changsu Choi at Seoul Nat U  <changsu@astro.snu.ac.kr>

Changsu Choi and Myungshin Im (CEOU/SNU)

We observed the field of GRB 160425A (Krimm et al. GCN Circ. 19343) using
LSGT(Lee Sang Gak Telescope; Im et al. 2015, JKAS, 48, 207 ). Images were
taken in R and I band starting on Apr. 26 15:14:22 UT(~15.24 hr after
burst). We do not detect the optical afterglow candidate within the XRT
enhanced error circle (Beardmore et al. GCN Circ. 19347) to the approximate
limiting magnitudes listed below.

mid-time(UT)                    post-bust-hour    exposure(s)
filter(limiting mag)
-----------------------------------------------------------------------------------------------------------

2016-04-26 16:10:02        16.16722                2700                   R
> 19.55
2016-04-26 17:04:26        17.07396                2700
I   > 19.22


Magnitudes are calibrated using USNO-B1 stars in R1 and I.