TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  352
SUBJECT: GRB 990506 - Optical Observations
DATE:    99/06/16 16:03:20 GMT
FROM:    Holger Pedersen at Copenhagen U Obs  <holger@astro.ku.dk>

H. Pedersen, J. Hjorth, B. L. Jensen (Copenhagen),  
A. O. Jaunsen (Oslo), and S. Holland (Aarhus) report on behalf 
of a larger collaboration:

"We have re-inspected our optical (R-band) images of GRB 990506 
(GCN #342) obtained on 6.96 May 1999 and 7.91 May 1999 UT. 
We find no convincing evidence for any stellar or extended 
object at the position of the proposed radio transient (GCN #350), 
neither in the sum image, nor in subsets. For the first night, 
we estimate a limiting magnitude of R > 23.5 (for point sources). 
Our images are available upon request."