GCN Circular 20966
Subject
DOAO 1m telescope V, R, I observation of GRB 170317A
Date
2017-04-01T02:04:01Z (8 years ago)
From
Changsu Choi at Seoul Nat U <changsu@astro.snu.ac.kr>
Changsu Choi(CEOU/SNU), Tae-Woo Kim(DOAO/NYSC), Myungshin Im(CEOU/SNU), on
behalf of a larger collaboration
We observed the field of GRB 170317A (LaPorte et al., GCN 20885) with 1m
telescope of Deokheung Optical Astronomy Observatory (DOAO) in Korea,
starting from 2017/3/17 10:41:47 to 11:59:41.5 UT which is 0.042 days to
0.093 days after BAT trigger. .
We obtained V, R, I images and clearly detected afterglow on the stacked
images (LaPorte et al., GCN 20885; Mazaeva et al., GCN20886; Xin et al.,
GCN 20888; Mao et al., GCN 20889; Kuroda et al., GCN20899).
The photometric calibration is based on in APASS catalog in the observed
field. No galactic extinction correction is applied.
Date UT start t-T0 Filter Exp. Mag
Err.
(mid, days) (s)
2017-03-17 10:41:47 0.042 I 180*3 18.86 0.10
2017-03-17 10:51:01 0.049 R 300*3 19.66 0.07
2017-03-17 11:06:18 0.057 I 300*5 20.29 0.26
2017-03-17 11:31:41 0.079 V 300*3 20.38 0.15
2017-03-17 11:46:59 0.086 R 300*2 19.98 0.15
2017-03-17 11:57:10 0.093 V 300*2 20.77 0.23