[vsnet-grb-info 3092] GRB060218, optical observations

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4929
SUBJECT: GRB060218,  optical observations
DATE:    06/03/27 16:57:54 GMT
FROM:    Adalberto Piccioni at Astronomy, Bologna U.  <adb at piccio.org>

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

We observed the OT of GRB 060218/SN 2006aj (Cusumano et al. GCN 4775)
in the V and R bands with the 152 cm Loiano telescope equipped with
the BFOSC camera system.
Observations  were carried out on 2006 Mar 7  and 11 under  poor
observing conditions (seeing=2.7-3.2 arcsec).
Using  the comparison stars reported by Hicken et al. (GCN 4898), we
find the following magnitudes, in agreement with those given by other
authors, e.g. Sollerman et al., astro-ph/0603495 and Pian et al.,
astro-ph/0603530:

Mean UT.........filter.....Exptime(s)....... magnitude
Mar 07.7506 ......Rc...........300..........17.31+/-0.06
Mar 07.7633.......Rc......... 1200..........17.36+/-0.03
Mar 07.7779.......V...........1200..........17.76+/-0.04
Mar 11.7865.......V............300..........18.15+/-0.08
Mar 11.7962.......V...........1200..........18.11+/-0.06
Mar 11.8123.......Rc..........1200..........17.63+/-0.04
Mar 11.8302.......Rc..........1200..........17.60+/-0.04

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