GCN Circular 23298

K.Ulaczyk, D.Steeghs, J.Lyman (U. Warwick), G.Ramsay (Armagh O.),
M.Dyer (U. Sheffield),  B.Gompertz, A.Levan, R.Cutter (U. Warwick)
K. Ackley, D.Galloway, E.Rol (Monash U.), V.Dhillon (U. Sheffield),
P.O'Brien, R.Starling (U. Leicester), S.Poshyachinda (NARIT),
D.Pollacco (U. Warwick), E.Thrane (Monash U.), E.Palle (IAC)

report on behalf of the GOTO collaboration:

In response to GRB 181002A (Gropp et al. GCN 23290
Not found
 
 
), the
Gravitational-wave Optical Transient Observer (GOTO) observed the
field near the Swift BAT/XRT detection.

Observations started at 2018-10-03T01:19:02 UT (13.9 hours after the
burst) consisting of a set of 3x5x120s exposures in our wide L filter
(400-700nm). We do not detect any optical source within the error
circle of the enhanced XRT location (Beardmore et al. GCN 23292
Not found
 
 
) with
a 5-sigma limit of g=20.8, using PanSTARRS calibrators on
the stacked image.

We note that our limits are deeper than those reported in Lipunov et al.
GCN 23293
Not found
 
 
 and Emery et al. GCN 23297
Not found
 
 
, albeit obtained 13.9 hours
post-burst.

GOTO is operated at the La Palma observing facilities of the University
of Warwick on behalf of a consortium including the University of
Warwick, Monash University, Armagh Observatory, the University of
Leicester, the University of Sheffield, the National Astronomical
Research Institute of Thailand (NARIT) and the Instituto de Astrofisica
de Canarias (IAC)

https://goto-observatory.org/