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GCN Circular 34430

Subject
GRB 230812B: Further Bassano Bresciano Observatory optical observations
Date
2023-08-15T09:18:46Z (9 months ago)
From
Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>
Via
legacy email
U.Quadri and  L.Strabla (Bassano Bresciano Astronomical Observatory),

Members of: 
AAVSO - American Association of Variable Star Observers.
UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili-GRB.
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 re-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 our 0.25-m Newton robotic telescope.

We coadded 155 x 60 sec. unfiltered images on August 14 2023, 
from 19:46:11 to 22:32:27 UT

We confirm a fading afterglow at the following coordinates +/- 0.2 arcsec:

RA (J2000.0) =  16h 36m 31.51s
DEC(J2000.0) = +47d 51p 32.2s

The results of OT photometry are:

-----------------------------------
      JD         mag      Err   Flt   
-----------------------------------
2460171.43558   20.5  +/- 0.3   CR    
    

CR is unfiltered with Rc zero point.

Magnitudes were estimated with the Pan-STARRS cat. 
and are converted using Lupton (2005) equations.

Not corrected for galactic dust extinction.

Reference:
http://www.osservatoriobassano.org/GRB.asp

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