TITLE:   GCN CIRCULAR
NUMBER:  37827
SUBJECT: GRB 241018A: Mondy optical upper limit
DATE:    24/10/19 16:18:06 GMT
FROM:    Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>

 N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP), S. Belkin
(IKI) report on behalf of GRB IKI FuN:

We observed the field of GRB 241018A (SVOM team, GCN 37812) with AZT-33IK
telescope of Mondy observatory in R-filter on 2024-10-18 (UT) 15:39:29. The
afterglow (SVOM/VT: GCN 37819; Swift XRT: Osborne et al., GCN 37823,
Optical NOT: Malesani et al. GCN 37821; SVOM/VT commissioning team, GCN
37826) is not detected in a stacked image. Preliminary photometry of the
field is the following.

Date UT start t-T0 Exp. Filter OT Err. UL(3 sigma)
(mid, days) (s)
2024-10-18 15:39:29 0.177032 60x60 R n/d n/d 21.7

The photometry is based on nearby USNO-B1.0 R2 stars.

The result is consistent with previously reported optic non-detection
(Turpin et al., GCN 37818; Ferro et al., GCN 37822; Song et al., GCN 37824;
Mohan et al., GCN 37825)