GCN Circular 40370
Subject
GRB 250502A: Bassano Bresciano Observatory upper limit
Date
2025-05-06T18:58:00Z (12 days ago)
From
Ulisse Quadri at Bassano Bresciano Observatory <osservatoriobassano@gmail.com>
Via
Web form
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),
report:
We imaged the field of GRB 250502A detected by SVOM with the robotic telescope of (IAU station 565) Bassano Bresciano Observatory, Italy.
The observations started 12h 23m after the trigger with our Newton telescope D=250 mm F/D=4.8.
We co-added 2 series of 100 exposures of 30 sec each.
Start T0+ End T0+ V lim.
12h 23m 13h 21m 19.0
13h 22m 14h 25m 19.0
We did not found any optical uncatalogued object within the SVOM error circle.
Our upper limit is consistent with other observations reported by Wang et al. GCN 40313; Rakotondrainibe et al. GCN 40315; An et al. GCN 40319; Li et al. GCN 40320; Ghosh et al. GCN 40322; A. de Ugarte Postigo et al. GCN 40328
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.altervista.org
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