GCN Circular 33302
Subject
GRB 230205A: possible host galaxy detection with the Schmidt - Asiago telescope
Date
2023-02-08T14:42:11Z (a year ago)
From
Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>
L. Tomasella (INAF-OAPd), P. D���Avanzo, (INAF-OAB), E. Cappellaro (INAF-OAPd) on behalf of a larger collaboration report:
We observed the field of the possibly short GRB 230205A (Ambrosi et al, GCN Circ. 33271; Sakamoto et al., GCN Circ. 33280)
with the Schmidt telescope of the INAF - Padova Astronomical Observatory located in Asiago (Italy). Observations were carried
out in imaging mode with the r and i filters about 2.5 days after the burst T0.
No clear afterglow candidate is detected within the enhanced XRT position (Goad et al., GCN Circ. 33275) down to the following
magnitude limits: r > 21.2 mag, i > 21.0 mag (AB; 3sigma c.l.).
In our i-band image we detect a source at the SW edge of the XRT error circle at the following position (J2000):
RA = 13:28:16.87
Dec = +46:43:29.3
For this source we measure a magnitude of i = 21.1 +/- 0.3 (AB).
We note that this source is detected also in archival SDSS and Pan-STARRS images. In the SDSS the source is named as
SDSS J132816.81+464329.8 and is flagged as a galaxy with a photometric redshift of z = 0.484 +/- 0.090 and a magnitude
i = 21.19 +/- 0.11 mag (AB; consistent with our measurement).
This object is therefore a candidate host galaxy for GRB 230205A.
As a further note, we report that the position of the X-ray afterglow of GRB 230205A lies at about 3.5 arminutes (in projection)
to the galaxy NGC 5169 (whose luminosity distance is ~ 33 Mpc).