GCN Circular 37458
Subject
EP240908a: Optical afterglow confirmation
Date
2024-09-11T18:49:47Z (6 months ago)
From
Antonio Martin-Carrillo at UCD,Space Science Group <antonio.martin-carrillo@ucd.ie>
Via
Web form
J. Quirola-Vasquez (Radboud Univ.), D. B. Malesani (DAWN/NBI and Radboud Univ.), A. J. Levan (Radboud Univ. & Warwick Univ.), P. G. Jonker (Radboud Univ), F. E. Bauer (PUC), J. van Dalen (Radboud Univ.), M. E. Ravasio (Radboud Univ.), D. Mata Sanchez (IAC), M. A. P. Torres (IAC), A. Martin-Carrillo (UCD), report on behalf of a larger collaboration:
We performed additional observations of the X-ray counterpart of EP 240908a (Mao et al., GCN 37432) using the Gemini-North telescope equipped with the GMOS-N imager. A total of 4 exposures by 180 s each were secured, with mid time 2024 Sep 10.417 UT (2.19 days after the revised EP detection time; Mao et al., GCN 37443).
The source reported by Quirola-Vasquez et al. (GCN 37438) is well detected in the new images and is still point-like (with a seeing of 0.6"). With respect to our previous observation, we measure a decay by ~0.5 mag, which confirms this object as the optical counterpart of EP 240908a
We acknowledge rapid and expert support of the observing staff at the Gemini telescope.