[vsnet-grb-info 19643] GRB 170728B iTelescope observation
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sun Jul 30 08:19:43 JST 2017
TITLE: GCN CIRCULAR
NUMBER: 21387
SUBJECT: GRB 170728B iTelescope observation
DATE: 17/07/29 23:19:08 GMT
FROM: Takanori Sakamoto at AGU <tsakamoto at phys.aoyama.ac.jp>
Y. Kitaoka, T. Sakamoto (AGU)
We observed the field of GRB 170728B detected by Swift (Cenko et al., GCN Circ. 21371)
with the iTelescope.Net (http://www.itelescope.net) T16 (Takahashi TOA-150) telescope
located at the AstroCamp Observatory (Nerpio, Spain). 20 images of 60 sec exposures
were taken in the R filter starting from July 28 23:03:19 (UT) about 36 mimute after
the trigger and stopped on July 29 00:17:48 (UT). We do not detect the optical afterglow
both in the individual images and the stacked image at the X-ray afterglow position.
The estimated five sigma upper limit of the combined image (total exposure of 1200 sec)
is ~15.8 using the USNO-B1 catalog.
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