TITLE: GCN CIRCULAR NUMBER: 39097 SUBJECT: GRB 250129A: AKO Optical Afterglow Detection DATE: 25/01/30 11:41:15 GMT FROM: Mohammad Odeh at Al Khatim Observatory M44 mshodeh@gmail.com

Mohammad Odeh (Al-Khatim Observatory, AKO, operated by the International Astronomical Center in Abu Dhabi, UAE), and Shaikha Alshamsi, Nuha Manal Pattani, and Nidhal Guessoum (American University of Sharjah, UAE), report:

We observed the field of GRB 250129A (Beardmore et al., GCN 39066) using our 0.36m f/7.7 robotic telescope. The observation session began on 29 January 2025 at 21:07 UT and continued until 22:02 UT, with a midpoint at 21:36 UT, approximately 16.8 hours after the trigger.

We obtained multiple 180-second exposures using the Ic filter. The optical afterglow was clearly detected at:

R.A. (J2000): 13:14:42.40

Dec. (J2000): +05:01:50.4

Our detection is consistent with the results of Francile et al., GCN 39065; Beardmore et al., GCN 39066; Schneider et al., GCN 39071; Belkin et al., GCN 39072; Izzo et al., GCN 39073; Izzo & Malesani, GCN 39074; Ghosh et al., GCN 39077; Schneider et al., GCN 39078; Brivio et al., GCN 39079; Siegel et al., GCN 39085; Zheng et al., GCN 39090; Schlekat et al., GCN 39091; Antier et al., GCN 39096.

The following observation was calculated using the Atlas catalogue as a reference:

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ObsTime (mid), Exposure (sec), Filter, Mag

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2025-01-29T21:35:48Z, 18 x 180s (stacked), Ic, 18.7 +/- 0.22

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The magnitude is not corrected for galactic extinction.

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