TITLE:   GCN CIRCULAR
NUMBER:  34493
SUBJECT: GRB 230818A: AKO Upper Limit
DATE:    23/08/19 17:53:39 GMT
FROM:    Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>

Mohammad Odeh, Osama Ghannam, Anas Mohammad, and Khalfan Al-Noaimy, report
on behalf of Al-Khatim Observatory (AKO) operated by the International
Astronomical Center in Abu Dhabi, UAE:

We observed the field of GRB 230818A (Lipunov et al., GCN 34476; Fermi: GBM
team, GCN 34478; Swift: Tohuvavohu et al., GCN 34479; Gompertz et al., GCN
 34480; Moskvitin et al., GCN 34483; Malesani et al., GCN 34485; Siegel et
al., GCN 34486; Pankov et al., GCN 34487; Quadri et al., GCN 34488; Pavoni
et al., GCN 34490; Klose et al., GCN 34491) with our 0.36m f/7.7 robotic
telescope.

We obtained 13 x 180 sec. images in the clear filter on 19 August, from
16:05 to 17:23 UT, (t_mid - t0 = 17.3 hours) with an upper limit of
magnitude = 22.0 for the stacked frames.

We also obtained 15 x 180 sec. images in the Ic filter from 16:02 to 17:32
UT, (t_mid - t0 = 17.35 hours) with an upper limit of magnitude = 20.2 for
the stacked frames.

No reliable optical afterglow object was detected.