GCN Circular 11065
Subject
GRB 100805A: Xinglong TNT optical observation
Event
Date
2010-08-06T05:36:45Z (15 years ago)
From
L.P. Xin at NAOC <xlp@bao.ac.cn>
L.P. Xin, Z. X. Ling, Y.L. Qiu, J.Y. Wei, J. Wang, J.S. Deng,
C. Wu, X. H. Han, J.Y. Hu on behalf of EAFON report:
We began to observe GRB100805A (Hoversten E. A. et al., GCN 11047 )
with Xinglong TNT telescope at 12:29:52 (UT), 8.28h after
the burst. Nine R band images were obtained. The exposure time for
each frame is 600 sec. The afterglow (Hoversten E. A. et al., GCN 11047)
with a brightness of 21.3+/-0.2 mag was detected with the combined
9*600s white-band data at the mean time of 8.95h after the burst.
The reference star is a nearby USNO-B1.0 star with a coordinates
of 19:59:33.3, +52:37:54.0, and a brightness of R2=17.41 mag.
Combining TNT data and other data reported in the previous GCN circulars
(Cenko, GCN 11050, GCN 11051;Gomboc et al. GCN11052;
Nissinen et al. GCN 11056; Gorosabel et al. GCN 11060; Wren et al. GCN 11064 ),
we infer that the brightness of OT was decaying with a power-law decay index of
alpha~0.73 from 100sec to 8.9h after the burst, consistent with
the reports of Cenko, GCN Circ. 11051 and Gomboc et al. GCN 10052.
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