[vsnet-grb-info 14563] GRB 140102A: TAOS early optical afterglow detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sun Feb 23 10:09:31 JST 2014
TITLE: GCN CIRCULAR
NUMBER: 15877
SUBJECT: GRB 140102A: TAOS early optical afterglow detection
DATE: 14/02/23 01:09:24 GMT
FROM: Ying-Tung Chen at ASIAA/TAOS <ytchen at 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.
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