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GCN Circular 33698

Subject
GRB 230427A: Bassano Bresciano Observatory upper limit
Date
2023-04-28T08:19:17Z (a year ago)
From
Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>
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 230427A detected by SWIFT(trigger 1165948)
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 8.72 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 2 series of 25 exposures of 60 sec each.

Start T0+      End T0+      Rlim
8.72 hour     9.63 hour     19.5

We did not found any optical counterpart in the error box of the XRTcandidate.
Troja et al., GCN 33687

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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