TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  332
SUBJECT: GRB 990510: optical observations
DATE:    99/05/18 22:10:54 GMT
FROM:    Gabriele Ghisellini at Obs.Astro. di Brera  <gabriele@merate.mi.astro.it>

G. Marconi and G.L. Israel (Observ. of Rome, Italy), D. Lazzati, S. Covino 
and G. Ghisellini (Observ. of Brera, Milan, Italy) report:

A 40 min exposure taken at ESO-NTT-SUSI2 1999, May 17.1066, with a 
seeing of 1.2" shows the OT of GRB990510 at the magnitude R=23.4+-0.1
(assuming R=16.5 for the USNO star at RA = 13:38:00.82, DEC=-80:29:11.7).
A 50 min exposure taken on May 18.1306 (1" seeing) shows the OT at  
R=23.7+\-0.1.
No obvious candidate host galaxy can be seen.
The NTT images are posted at: 
      http://www.merate.mi.astro.it/~gabriele/990510/ 

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