TITLE:   GCN CIRCULAR
NUMBER:  37335
SUBJECT: GRB 240825A: iTelescope optical observations
DATE:    24/08/29 04:47:21 GMT
FROM:    Filipp Dmitrievich Romanov at Amateur astronomer <filipp.romanov.27.04.1997@gmail.com>

I observed the field of GRB 240825A (Gupta et al., GCN Circ. 37274)
remotely using telescope T73 (0.356-m f/7.2 Corrected Dall-Kirkham +
CMOS) of iTelescope.Net (located in Deep Sky Chile at Rio Hurtado
Valley, Chile) on 2024-08-26. Five images (exposure times of 300
seconds, BINx1) were obtained with Luminance filter with mid time
03:22:03 UT (11.48 h. after the trigger). I clearly detected the
optical afterglow in the UVOT position. I measured the magnitude of it
= 21.0 +/- 0.2 compared to r magnitudes of nearby stars from
Pan-STARRS DR1 catalogue (Chambers et al., 2016).

Magnitude was not corrected for Galactic extinction.

Stacked image: https://www.flickr.com/photos/filipp-romanov/53955441999

F. D. Romanov (AAVSO).