TITLE:   GCN CIRCULAR
NUMBER:  26098
SUBJECT: GRB 191019A: Zadko Telescope optical observations
DATE:    19/10/30 05:46:27 GMT
FROM:    Bruce Gendre at UVI  <bruce.gendre@gmail.com>

B. Gendre (OzGrav-UWA), H. Crisp (OzGrav-UWA), D. Coward (OzGrav-UWA), 
J. Zadko (Claire Energy), J. A. Moore (OzGrav-UWA), A. Burrell 
(OzGrav-UWA), A. Klotz (IRAP-OMP-UPS), P. Thierry (Auragne Observatory), 
E.J. Howell (OzGrav-UWA), A. Verveer (ASA), J. Kennewell (UWA, ASA)

report:

We observed GRB 191019A (Simpson et al., GCN 26031) with the Zadko 
Telescope (Coward et al. 2017), starting at 2019 October the 19th at
15:20:23 UT (7 minutes 50 seconds after the trigger) under fair conditions.

The object reported by Reva et al. (GCN 26036) is clearly visible in our 
images. However, we measure an R magnitude of 18.92 at the time reported 
by the GCN. Observations stopped one hour twenty three minutes after the 
burst, and during that time we do not see any variation on the light 
curve, similar to other teams (Perley et al., GCN 26039; Fynbo et al., 
GCN 26041; and Zhu et al., GCN 26059). At that position, the USNO 
catalog reports a source of magnitude R = 19.0, consistent with our 
findings. We conclude that this object is not the afterglow of GRB 
191019A, but the host galaxy, as reported by Perley et al. (GCN 26062).


The Zadko Telescope has been under refurbishment during the last year, 
and is still in recommissioning mode. This message can be cited.


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