TITLE:   GCN CIRCULAR
NUMBER:  34377
SUBJECT: GRB 230805B: Iota Scorpii Observatory, La Spezia, Italy upper limit
DATE:    23/08/09 19:55:18 GMT
FROM:    GIULIO SCARFI at IOTA SCORPII OBSERVATORY <terziaria@gmail.com>

Giulio Scarfì (Gruppo Astronomia Digitale - Iota Scorpii Observatory, La
Spezia,
Italy)
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)
Unione Astrofili Italiani (UAI)
report:

We imaged the field of GRB 230805B detected by SWIFT(trigger 11:23:51 UT)
with the telescope GSO 16” of Iota Scorpii Observatory, La Spezia Italy

Member of:

UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili, GRB section.
GAD - Gruppo Astronomia Digitale.

The observations started 550 min after the GRB trigger, at the end of
twilight,
with a Ritchey Cretien D=406 mm with reducer F/D=6,15.
Weather conditions were very good.

We co-added 6 exposures of 300 sec each.


Start T0+      End T0+       R lim
550 min        581 min         20


We did not found any optical counterpart in the error box of the XRT
candidate.
Page et al. GCN 34339

Magnitudes were estimated with the Gaia EDR3 cat. and
are not corrected for galactic dust extinction. 20.0

Reference:
https://www.parcodellestelle.com/

The message may be cited.