TITLE:   GCN CIRCULAR
NUMBER:  37076
SUBJECT: GRB 240805B Bassano Bresciano Observatory upper limit
DATE:    24/08/06 15:20:26 GMT
FROM:    Ulisse Quadri at Bassano Bresciano Observatory <osservatoriobassano@gmail.com>

U.Quadri, L.Strabla and P.Madurini (Bassano Bresciano Astronomical Observatory),

Members of: 
AAVSO - American Association of Variable Star Observers.
UAI - Unione Astrofili Italiani/GRB section.
GAC - Gruppo Astrofili Cremonesi.

In a large collaboration with:
M.G. Dainotti (National Astronomical Observatory of Japan), 
Y. Niino (Tokyo University, Institute of Astronomy), 
K. Kalinowski (Aarhus University, Department of Physics and Astronomy),
B. De Simone (Universita' degli Studi Di Salerno)
report:

We imaged the field of GRB 240805B detected by SWIFT (trigger num. 1246989)
with the robotic telescope of (IAU station 565) Bassano Bresciano Observatory, Italy.

The observations started 6.72 hour after the GRB trigger, At the end of twilight 
with our Newton telescope D=450 mm F/D=4.5.

Weather conditions were good.

We co-added 2 series of 50 exposures of 20 sec each.

Start T0+      End T0+        Vlim
6.72 hour     7.02 hour       21.2
7.02 hour     7.35 hour       21.2


We did not found any optical counterpart in the error box of the XRTcandidate:
M. A. Williams et al., GCN 37043; Z.P. Zhu et al., GCN 37050; V. Lipunov et al., GCN 37051;
R. Strausbaugh et al., GCN 37052; A. Moskvitin et al., GCN 37055; Z. Maksut et al., GCN 37060;
Guowang Du et al., GCN 37062; N. Pankov et al., GCN 37072.

Magnitudes were estimated with the pan-STARRS cat. 
and are derived using Lupton (2005) equations.
Not corrected for galactic dust extinction.

Reference:
http://www.osservatoriobassano.org/GRB.asp

The