TITLE:   GCN CIRCULAR
NUMBER:  37305
SUBJECT: GRB 240824B: Ondrejov D50 optical limit
DATE:    24/08/26 21:44:19 GMT
FROM:    Martin Jelinek at Astro.Inst-AVCR,Ondrejov <martin.jelinek@asu.cas.cz>

Martin Jelinek, Jan Strobl, Alzbeta Malenakova, Rene Hudec and Cyril
Polasek (ASU CAS Ondrejov, CZ), report:

We observed the Swift-XRT localization (Kennea et al. GCN 37270) of the
Fermi/GBM (Fermi GBM Team GCN 37260, Sharma et al. GCN 37284), MAXI/GSC
(Nakajima et al. GCN 37261) and Swift/BAT (DeLaunay et al. GCN 37267)
detected GRB 240824A with the 50 cm robotic telescope (D50) of Ondrejov
observatory in Czech republic.

We obtained a set of 120 s Sloan-i' band exposures starting at 00:10 UT,
i.e. 10.985 h after the initial trigger. Consistently with Malesani et al.
(GCN 37281) and Zheng et al (GCN 37286), we do not detect any emission in
or near the Swift-XRT error box. The magnitude limit of our 2.15 h summed
integration with a mean time T-T0 12.067 h post burst is i' > 21.3 (AB).