[AAVSO-HEN] GRB 090313: optical observations

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  9606
SUBJECT: GRB 090313: optical observations
DATE:    09/07/03 10:53:29 GMT
FROM:    Graziella Pizzichini at IASF/CNR,Bologna  <pizzichini at iasfbo.inaf.it>

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

    During the night between 09/03/13 and 09/03/14 we observed the OT of
    GRB090313 (Chornock et al., GCN 8979, Mao et al., GCN 8980) with the
    1.52 cm telescope of the Bologna Observatory in Loiano. Airmass 1.24
    and seeing less than 2" .
    Observations were disturbed by the moon. The images were calibrated
    using the star quoted by Guidorzi et al.,  GCN 8989.
    By summing 9 images in filter R, with a total duration of 2280s
    obtained on March 14 between 00:41:11 and 01:27:59 UT, (mid exposure
    time 15.97 hr after the burst) we find R mag = 19.26 +/- 0.15

    Our  image has been posted in our public directory
    from where it can be retrieved by sftp using
    sftp publicGRB at 137.204.66.221
    password: GRB_bo
    cd GRB090313