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GCN Circular 34349

Subject
GRB 230805B: Bassano Bresciano observatory upper limit
Date
2023-08-06T07:04:21Z (10 months ago)
From
Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>
Via
legacy email
U.Quadri and  L.Strabla (Bassano Bresciano Astronomical Observatory),
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 230805B detected by SWIFT(trigger 1183217)
with the robotic telescope of (IAU station 565) Bassano Bresciano 
Observatory, Italy. Member of: 
AAVSO - American Association of Variable Star Observers.
UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.
GAC - Gruppo Astrofili Cremonesi.

The observations started 8.74 hour after the GRB trigger, At the end of twilight 
with our Newton telescope D=250 mm F/D=4.8.

Weather conditions were good.

We co-added 4 series of 20 exposures of 60 sec each.

Start T0+      End T0+     CR lim
8.74 hour   10.00 hour      19.5

CR is unfiltered with R zero point

We did not found any optical counterpart in the error box of the XRTcandidate.
S. B. Cenko (GSFC) et al. GCN 34339

Magnitudes were estimated with the USNO-B1.0 cat. and 
are not corrected for galactic dust extinction.

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

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