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GCN Circular 332

GRB 990510: optical observations
1999-05-18T22:10:54Z (25 years ago)
Gabriele Ghisellini at Obs.Astro. di Brera <>
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  
No obvious candidate host galaxy can be seen.
The NTT images are posted at: 

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