[vsnet-grb-info 6403] GRB 080723A: optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8018
SUBJECT: GRB 080723A: optical upper limit 
DATE:    08/07/25 14:19:30 GMT
FROM:    Graziella Pizzichini at IASF/CNR,Bologna  <pizzichini at iasfbo.inaf.it>

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

   We observed the field of GRB 080723A (GCN 8000 Stamatikos et al.)
   with the 152 cm telescope located in Loiano under clear sky conditions
   (seeing~2.5").

   In our 20 min exposure in the Rc filter at mean time 2008 July 23
   20.62 UT we do not detect any afterglow candidate in the enhanced Swift-XRT
   position (GCN 8001, Beardmore et al.).

   Our 3-sigma limiting magnitude is R~20 (based on Nomad1 catalogue).
   In this area there is a strong galactic extinction, A_lambda ~ 4 mag in R
   from the NASA/IPAC extragalactic data base.
   The image has been posted in our public directory
   from where it can be retrieved by sftp using

   hostname: ermione.bo.astro.it
   username: publicGRB
   password: GRB_bo
   directory: GRB080723A