TITLE:   GCN CIRCULAR
NUMBER:  38821
SUBJECT: GRB 250103A: Bassano Bresciano Observatory upper limit
DATE:    25/01/04 13:43:22 GMT
FROM:    Ulisse Quadri at Bassano Bresciano Observatory <osservatoriobassano@gmail.com>

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

Members of: 
GRB/UAI - Gamma ray Burst section of Unione Astrofili Italiani.
AAVSO - American Association of Variable Star Observers.
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 250103A detected by SVOM with the robotic telescope of (IAU station 565) Bassano Bresciano Observatory, Italy.
The observations started 7h 55m after the GRB trigger with our Newton telescope D=450 mm F/D=4.5.

We co-added 2 series of 100 exposures of 20 sec each.

Start T0+   End T0+    Rc lim.   Err.
 7h 46m     8h 27m      20.2   +/- 0.1
 8h 28m     9h10m       20.2   +/- 0.1

We did not found any optical uncatalogued object within the SVOM error circle.

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

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