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GCN Circular 34436

GRB 230812B: Iota Scorpii Observatory, La Spezia, Italy
2023-08-15T14:09:22Z (8 months ago)
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Giulio Scarfì  (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)

Members of:

GAD - Gruppo Astronomia Digitale.
AAVSO - American Association of Variable Star Observers.
UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili-GRB.


I have observed the field of GRB 230812B (Lesage et al., GCN 34387;
Scotton et al., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN
34395; Lipunov et al., GCN 34396; Salgundi et al., GCN 34397; Ackley
et al., GCN 34398; Xiong et al., GCN 34401; Casentini et al., GCN
34002; Frederiks et al., GCN 34403; Mao et al., GCN 34404; Odeh et
al., GCN 34405; Moskvitin & Spiridonova GCN 34406; Leonini et al. GCN
34408; de Ugarte Postigo et al. GCN 34409; de Ugarte Postigo et al.
GCN 34410; Belkin et al. GCN 34412; Ruocco et al. GCN 34413; Frederiks
et al. GCN 34414; Ruocco et al. GCN 34415; Shrestha et al. GCN 34416;
Quadri et al. GCN 34417; Adami et al. GCN 34418; Moretti et al. GCN
34419; Kumar et al. GCN 34420; Belkin et al. GCN 34421 & GCN 34423;
Pyshna et al., GCN 34425) with my 0.40-m Ritchey-Cretien telescope.

The observations started 1660 min after the GRB trigger, at the end of
with a Ritchey Cretien D=406 mm with reducer F/D=6,15.
Weather conditions were good.

Add 12 x 300 sec. unfiltered images on August 13 2023,
from 20:26:35 to 21:21:42 UT

Start T0+      End T0+       R lim
1660 min        1735 min         20

I confirm a fading afterglow

The results of photometry are:

      JD         mag      Err   Flt

2460170.36555307   19.85  +/- 0.2   CLEAR

Magnitudes were estimated with the Atlas catalog and
are not corrected for galactic dust extinction.


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