TITLE: GCN CIRCULAR NUMBER: 39101 SUBJECT: GRB 250129A: iTelescope optical observation DATE: 25/01/30 20:15:55 GMT FROM: Filipp Dmitrievich Romanov at Amateur astronomer filipp.romanov.27.04.1997@gmail.com
I observed the field of GRB 250129A (Beardmore et al., GCN Circ. 39066) remotely using telescope T11 (0.51-m f/6.8 reflector + CCD + f/4.5 focal reducer) of iTelescope.Net (located in Utah Desert Remote Observatory at Great Basin Desert, Beryl Junction, Utah, USA) on 2025-01-30. Five images (exposure times of 300 seconds, BINx1) were obtained with Rc filter. I detected the optical afterglow in all images in the UVOT position. I measured the magnitude of it = 19.7 +/- 0.2 in the stacked image (mid time 13:11:06 UT = 32.43 h. after the trigger) 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/54297183051/
F. D. Romanov (AAVSO).
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