TITLE:   GCN CIRCULAR
NUMBER:  32666
SUBJECT: Swift J1913.1+1946: New Photometry
DATE:    22/10/10 17:37:10 GMT
FROM:    Mohammad Odeh at Al Khatim Observatory M44  <mshodeh@gmail.com>

Mohammad Odeh at Al Khatim Observatory (M44), operated by the International
Astronomical Center (IAC), in Abu Dhabi, UAE.

We’ve just observed the optical afterglow of the extremely bright GRB Swift
J1913.1+1946 (Dichiara et al., GCN Circ. 32632) using 0.36m f/7.7 Schmidt
Cassegrain telescope on 10 October 2022 as the night started. Two sets of
three stacked frames were analyzed, each frame is 180 seconds of exposure
using Iс filter. The magnitude was 17.8!

Date & Time (UTC)      Mag (Ic)   MagErr
2022-10-10T15:38:05Z   17.8        0.09
2022-10-10T16:31:28Z   17.8        0.03

The below GIF video shows how the object faded today, where the first
frames in this video were taken yesterday when the magnitude was 15.5, and
the frames at the end of the video show how it becomes fainter now at
magnitude 17.8.
https://www.astronomycenter.net/image/GRB.gif