GCN Circular 40064
Subject
EP250404a: AKO Optical Afterglow Detection
Date
2025-04-04T18:35:28Z (a month ago)
From
Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>
Via
email
Mohammad Odeh (Al-Khatim Observatory, AKO, operated by the International
Astronomical Center in Abu Dhabi, UAE), and Shaikha Alshamsi and Nidhal
Guessoum (American University of Sharjah, UAE), report:
We observed the field of EP250404a detected by EP (Hu et al., GCN 40051),
using our 0.36m f/7.7 robotic telescope. The observation session began on 04
April 2025 at 15:47 UT and continued until 16:56 UT, with a midpoint at
16:22 UT, approximately 2 hours after the trigger.
We obtained multiple 180-second exposures using the Ic filter. The optical
afterglow was clearly detected at:
R.A. (J2000): 08:20:14.59
Dec. (J2000): +35:31:42.3
Our detection is consistent with the results of (Jiang et al., GCN 40052;
Perez-Garcia et al., GCN 40053; Du et al., GCN 40058; Konno et al., GCN
40063).
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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2025-04-04T16:21:38Z, 20 x 180s (stacked), Ic, 17.5 +/- 0.35
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The magnitude is not corrected for galactic extinction.