TITLE:   GCN CIRCULAR
NUMBER:  17713
SUBJECT: LOAO B, R Observations of GRB150413A
DATE:    15/04/17 06:54:10 GMT
FROM:    Changsu Choi at Seoul Nat U  <changsu@astro.snu.ac.kr>

Changsu Choi, Myungshin Im (CEOU/SNU), Hyun-Il Sung (KASI), and Yuji Urata
(NCU), on behalf of EAFON

We observed the field of GRB 150413A, Swift GRB 150413A (Markwardt et al.,
GCN
17688) in B,R-band using the 1-m telescope at Mt. Lemmon Optical Observatory
(LOAO) in Arizona, US

We obtained B, R-band images on Apr. 14.
We identified the optical afterglow in both band.
The photometric calibraton is based on APASS catalog(AAVSO) in the observed
field.

Details of Photometry are below:

UT                               Filter       Mag                 Hour
after detetion trigger(2015/04/13T 13:54:58)
2015/04/14T 04:54:07    B            20.95 +-0.25    15.13583

2015/04/14T 05:08:05    R            19.82 +-0.14    15.36861