TITLE:   GCN CIRCULAR
NUMBER:  24673
SUBJECT: LIGO/Virgo S190425z: No counterpart candidate in Zadko-GRANDMA observations.
DATE:    19/05/28 22:21:03 GMT
FROM:    Bruce Gendre at UVI  <bruce.gendre@gmail.com>

B. Gendre (OzGrav-UWA), C. Lachaud (APC), V. Aivazyan (Iliauni), K. 
Barynova (Kyiv Uni), A. Burrel (OzGrav-UWA), B. Chabert (OzGrav-UWA), H. 
Crisp (OzGrav-UWA), D.Coward (OzGrav-UWA), E. Howell (OzGrav-UWA), A. N. 
Klotz (UPS), J. Moore (OzGrav-UWA), S. Antier (APC), S. Basa (LAM), M. 
Boer (Artemis), D. Corre (LAL), M. Coughlin (Caltech), J.G. Ducoin 
(LAL), P. Hello (LAL), A. Klotz (IRAP), N. Leroy (LAL), D. Turpin 
(NAOC), X. Wang (THU),

report on behalf of the Zadko Telescope team and GRANDMA collaboration;

We performed tiled observations of LIGO/Virgo BNS event S190425z with 
the Zadko telescope, using a clear filter.

The observation started on 04/25/19 14:56:19 UTC which corresponds 
approximately to 6.65 hours after the GW trigger time. However, due to 
hardware issues, the first images of interest were obtained the next day 
(04/26/19, 14:19:00 UTC)

We performed the following observations in galaxy targeting mode:

   R.A.      DEC.
16:57:53 -01:56:51
16:57:38 -01:48:37
16:57:07 -01:52:10
16:04:51 +24:03:15
16:04:32 +23:55:05

We have not found any credible counterpart candidate, down to R ~ 16.

The Zadko team acknowledges support from the OzGrav Centre of Excellence 
of the Australian Research Council. GRANDMA (Global Rapid Advanced 
Network Devoted to the Multi-messenger Addicts) is a network of robotic 
telescopes connected all over the world with both photometry and 
spectrometry capabilities for Time-domain Astronomy 
(https://grandma.lal.in2p3.fr/).

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