GCN Circular 3410
Subject
GRB050509B: Optical observations at the Very Large Telescope
Date
2005-05-11T13:41:19Z (19 years ago)
From
Brian Lindgren Jensen at U.of Copenhagen <brian_j@astro.ku.dk>
GRB 050509B: Optical observations at the Very Large Telescope
J. Hjorth, J. Sollerman, B. L. Jensen, J. P. U. Fynbo, P. Jakobsson,
J. M. Castro Cer�n, K. Pedersen, H. Pedersen, D. Watson (Niels Bohr
Institute), R. Starling (Amsterdam), J. Gorosabel (IAA-CSIC Granada),
E. Ramirez-Ruiz (IAS, Princeton), C. Kouveliotou (NASA/MSFC) on behalf
of GRACE, report :
"Using FORS2 on the 8.2m Antu Telescope at ESO/Paranal we have obtained
45 min R-band imaging (FWHM~0.7") of the XRT error circle for GRB
050509B (Swift trigger 118749, GCN 3381) at a mean epoch of May 11.0 UT.
In the revised XRT error-circle (GCN 3395) we detect the four sources
(S1-S4) mentioned in GCN 3401. None of these sources show pronounced
variability with respect to the image posted in GCN 3401. The source
previously designated S3 seems to be resolved into two sources separated
by 1.8", or a new source is apparent in the centre of the error circle.
The position of this source is:
S5:
RA(2000) = 12:36:13.88, Dec(2000) = +28:59:01.0
Another object is included just within the revised 90% XRT error-circle.
The coordinates of this object is:
S6:
RA(2000) = 12:36.13.63, Dec(2000) = +28:59:07.7
An image of the field is shown at:
http://www.astro.ku.dk/~brian_j/grb/grb050509B/
We plan to monitor the field with the VLT in the following weeks.
We thank the Paranal Observatory staff, in particular Chris Lidman and
Jura Borissova, for efficiently conducting the reported service-mode
observations.
"
[GCN OPS NOTE(11may05): Per author's request, the RA value in source S6
was changed from "12:33.13.63" to "12:36.13.63".]