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GCN Circular 34141

Subject
GRB 230328B: LBT detection of the likely host galaxy
Date
2023-07-04T14:14:34Z (10 months ago)
From
Andrea Rossi at INAF <andrea.rossi@inaf.it>
A. Rossi, E. Maiorano, and E. Palazzi (INAF-OAS) report on behalf of the CIBO collaboration:

We observed the field of the long GRB 230328B detected by Fermi-GBM  (Fermi GBM Team, GCN 33526Not found
 
 
; Dalessi et al., GCN 33531Not found
 
 
), Swift-BAT (Gropp et al., GCN 33527Not found
 
 
), AstroSat-CZTI (Waratkar et al., GCN 33532Not found
 
 
), GRBAlpha (Dafcikova et al., GCN 33543Not found
 
 
), and Konus-Wind (Svinkin et al., GCN 33544Not found
 
 
). We obtained 20 min of g'- and r'-band imaging with the LBC camera mounted on LBT (Mt Graham, AZ, USA) on 2023-06-23, ~3 months after the burst trigger. Observations were performed under mediocre weather conditions with a strong SW wind and thus an average seeing of ~2".

At the location of the optical afterglow (Pankov et al., GCN 33528Not found
 
 
; Belkin et al., GCN 33530Not found
 
 
; Lu et al., GCN 33534Not found
 
 
; Catapano et al., GCN 33535Not found
 
 
; Suresh et al., GCN 33536Not found
 
 
; Adami et al., GCN 33537Not found
 
 
; Gompertz et al., GCN 33538Not found
 
 
; Komesh et al., GCN 33539Not found
 
 
; Kumar et al., GCN 33547Not found
 
 
; Kugel et al., GCN 33550Not found
 
 
; Siegel et al., 33556; Pozanenko et al., GCN 33559Not found
 
 
), we detect a faint source which is likely the GRB host galaxy. We measure the following AB magnitudes:

g 24.2 +- 0.3
r 23.8 +- 0.2

calibrated against PanSTARRS field stars, and not corrected for the foreground Galactic extinction.

We acknowledge the excellent support from the LBTO and LBT-INAF staff, particularly D. Thompson, D. Gonzalez Huerta, F. Cusano and D. Paris, in obtaining these observations.