TITLE:   GCN GRB OBSERVATION REPORT
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 Cerón, H. Pedersen, Darach Watson (Niels Bohr Institute),
Tapio Pursimo, Raine Karjalainen, John Telting (Nordic Optical
Telescope), Björn 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/
"