[vsnet-grb-info 4249] GRB 070125: optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6047
SUBJECT: GRB 070125: optical observations
DATE:    07/01/28 13:03:03 GMT
FROM:    Giuseppe Greco at U Bologna  <giuseppe.greco2 at studio.unibo.it>

G. Greco (Bologna University), F. Terra (Second University of
Roma "Tor Vergata"), C. Bartolini, A. Guarnieri, A. Piccioni
(Bologna University), G. Pizzichini (INAF/IASF Bologna),
D. Nanni (INAF/OAR and Second University of Rome "Tor Vergata"), 
R. Gualandi (Bologna Observatory) and V. F. Polcaro (INAF/IASF Roma) 
report:

On January 27-28 we observed the field of GRB 070125
(Hurley et al., GCN 6024) with the 152 cm Cassini Telescope
located in Loiano, equipped with BFOSC under clear sky 
conditions (seeing approximately  2 arcsec).
The photometry is based on the SDSS stars and the 
trasformation derived from Lupton (2005).

For the optical afterglow detected by Cenko and
Fox (GCN 6028) we find the following magnitudes:

..Mean..UT .......Filter........Exptime (s).......magnitude
Jan...27.950........Rc............1200............20.23 +/-0.10
Jan...27.966........Rc............1200............20.26 +/-0.11
Jan...27.983........Rc............1200............20.21 +/-0.11
Jan...28.087........Rc............1200............20.25 +/-0.11
Jan...28.102........Rc............1200............20.35 +/-0.12

One of our images is available in a public directory from where
it can be retrieved by sftp by using:
hostname: ermione.bo.astro.it
username: publicGRB
password: GRB_bo
directory: GRB070125