TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3675
SUBJECT: GRB 050724: spectroscopy of object in the XRT error circle 
DATE:    05/07/25 18:05:48 GMT
FROM:    Silvia Piranomonte at OAR  <piranomonte@mporzio.astro.it>

S. Piranomonte (INAF/OAR), D. Fugazza (INAF/OABr), F. Fiore (INAF/OAR), S. Covino (INAF/OABr),
P. D'Avanzo (INAF/OABr), D. Malesani (SISSA), G. Tagliaferri (INAF/OABr), G. Chincarini (Univ. 
Milano-Bicocca) and L. Stella (INAF/OAR), on behalf of the MISTICI collaboration, report:

Using the FORS1 instrument at the ESO VLT, we obtained a spectrum of the 
object indicated by Antonelli et al. (GCN 3666), also named as object B 
by Bloom et al. (GCN 3672). This object is liying close to the XRT 
errorbox center (Covino et al., GCN 3665; Romano et al., GCN 3669). 
Observations were obtained on 2005, July 24, starting at 23:16:00 
UT, under good seeing conditions. We used the grism 300V with a slit of 
1.0 arcsec. The integration time was 900 s.


The object is identified with a star trough Ca, CN, G-band, Hbeta, Na 
and Halpha faint absorption lines. It has therefore no likely 
association with GRB 050724.

We thank the excellent work by the ESO staff in performing these 
observations.

This message may be cited.

[GCN OPS NOTE(28jul05):  Per author's request, in the Subject-line
the "GRB 050624" was changed to "GRB 050724".]