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GCN Circular 30000

Subject
Short GRB 210323A: likely host galaxy detection
Date
2021-05-12T14:38:46Z (3 years ago)
From
Daniele B Malesani at DTU Space <malesani@space.dtu.dk>
Daniele B. Malesani (DTU Space), Luca Izzo (DARK/NBI) and Andrea Rossi 
(INAF/OAS) report on behalf of a larger collaboration.

We observed again the field of the short GRB 210323A (Gropp et al., GCN 
29699). We used the ALFOSC camera at the Nordic Optical Telescope (NOT). 
Observations were carried out during the night of 2021 May 4, 
approximately 42.3 days after the GRB, and consisted of 5x600 s exposure 
in the r band.

The optical source detected in our earlier observation (Malesani et al., 
GCN 29703; see also Pozanenko et al., GCN 29708; de Ugarte Postigo et 
al., GCN 29717; Rastinejad et al., GCN 29720) has clearly faded, 
confirming it is the afterglow of GRB 210323A. Directly underneath the 
position of the optical transient, a faint source is visible in the 
stack of our images, which is likely the host galaxy of the GRB (see 
also Rastinejad et al., GCN 29720).

We measure for the host an AB magnitude r = 24.6 +- 0.3, calibrated 
against nearby stars from the Pan-STARRS catalogue.

We acknowledge expert help from the support astronomer at the NOT, 
Amanda Djupvik.
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