GCN Circular 21387
Subject
GRB 170728B iTelescope observation
Date
2017-07-29T23:19:08Z (7 years ago)
From
Takanori Sakamoto at AGU <tsakamoto@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.