TITLE: GCN CIRCULAR NUMBER: 35118 SUBJECT: GRB 231117A: AKO Follow-Up Observation DATE: 23/11/19 06:50:00 GMT FROM: Mohammad Odeh at Al Khatim Observatory M44 M. Odeh (Al-Khatim Observatory, AKO, operated by the International Astronomical Center in Abu Dhabi, UAE) and N. Guessoum, D. Akl and I. Abdi (American University of Sharjah, UAE) report: As a follow-up to our first observation of GRB 231117A, performed on Nov. 17, 2023 (GCN 35084 ), we again observed the field with our 0.36m f/7.7 robotic telescope, on Nov. 18, starting at 15:50 UT using an (Ic) filter. We again detected a faint object at the same location of the source SDSS J220933.34+133119.5 (PS1 ID = 124223323889577032), which is listed in the Pan-STARRS catalogue with imag = 21.5, and in the SDSS catalogue with imag = 20.9. The coordinates of the detected object are: R.A. (2000) = 22:09:33.36, Dec. (2000) = +13:31:20.1, which is consistent with the coordinates of the candidate optical source reported by Yang et al. (GCN 35083 ). The following table summarizes the results of both nights using the Atlas catalogue as a reference: --------------------------------------------------------------------------- ObsTime (mid), T(Mid)–T(0), Exposure, Filter, Mag, RMS, Limiting Magnitude --------------------------------------------------------------------------- 2023-11-17 15:37:30Z, 12.6 h, 33x180s (stacked), Ic, 19.85, 0.20, 20.2 2023-11-18 15:50:06Z, 1.53 d, 40x180s (stacked), Ic, 19.78, 0.21, 20.4 --------------------------------------------------------------------------- The magnitudes are not corrected for galactic extinction.