GCN Circular 15877
Subject
GRB 140102A: TAOS early optical afterglow detection
Event
Date
2014-02-23T01:09:24Z (13 years ago)
From
Ying-Tung Chen at ASIAA/TAOS <ytchen@asiaa.sinica.edu.tw>
Y. T. Chen, S. K. King, C. Y. Wen, K. Y. Huang, S. Y. Wang, M. Lehner and
TAOS team
We observed the field of the Swift GRB 140102A (Hagen et al., GCN 15653)
with TAOS 0.5-m telescope of Lulin observatory (Taiwan) starting on Jan., 2
(UT) 21:19:49, i.e., 2.2 minutes after the trigger.
We detected the fading optical afterglow at the time between few early
optical afterglow observations (Xu et al., GCN 15655; Guziy et al., GCN
15685; Yoshii et al. GCN 15778). The details of the photometry were listed
below.
DATE_T_START T0+ T_EXP MAG
(UT) sec sec R
2014-01-02 21:19:49 132 49 15.3+/-0.11
2014-01-02 21:20:38 181 49 15.7+/-0.15
2014-01-02 21:21:27 230 49 16.1+/-0.26
2014-01-02 21:22:16 279 49 (Upper Limit = 16.2)
The R-band magnitude of nearby USNOB1 stars have been used for calibration.
We note that a special filter (5000-7200 A) was used in TAOS telescopes.