TITLE:   GCN CIRCULAR
NUMBER:  3460
SUBJECT: GRB 050509A: Further I-band imaging
DATE:    05/05/23 12:48:28 GMT
FROM:    Brian Lindgren Jensen at U.of Copenhagen  <brian_j@astro.ku.dk>

GRB 050509.074: Further I-band imaging

Johan P. U. Fynbo, Brian L. Jensen, Jens Hjorth, Pall Jakobsson,
J. M. Castro Cer�n, H. Pedersen, Darach Watson (Niels Bohr Institute),
Tapio Pursimo, Raine Karjalainen, John Telting (Nordic Optical
Telescope), Bj�rn Voss (University of Kiel) report:

"Using StanCAM on the 2.56m Nordic Optical Telescope we have obtained
further I-band imaging of the XRT error circle for GRB 050509.074
(Swift trigger 118707, GCN 3379, 3380) on May 19.17. All sources
detected in our early I-band images from 20 min and 2.5 hr after the
burst (GCN 3389) are also detected in the image from May 19. Our 3-sigma
upper limit on the magnitude of any transient source in the XRT error
circle (except in the eastern part covered by the bright star) is
I=22.5. Images of the field are shown at:

http://www.astro.ku.dk/~brian_j/grb/grb050509.074/
"