GCN Circular 33358
Subject
GRB 230217A: 6 GHz VLA observations
Date
2023-02-20T22:04:09Z (a year ago)
From
Genevieve Schroeder at Northwestern University <genevieveschroeder2023@u.northwestern.edu>
G. Schroeder, W. Fong (Northwestern), E. Berger (Harvard), T. Laskar (Utah)
report:
"We observed the short GRB 230217A (Moss et al., GCN 33339; Casentini et
al., GCN 33343; Torii et al., GCN 33342; Svinkin et al., GCN 33349) with
the Karl G. Jansky Very Large Array (VLA) under program 23A-296 (PI:
Schroeder) beginning on 2023 February 18.67 UT (0.76 days post-burst) at a
mean frequency of 6 GHz. The VLA has a primary beam of ~7 arcmin at 6 GHz,
covering the entirety of the Swift/BAT position (Moss et al., GCN 33339).
We searched for radio sources near the two X-ray sources coincident with
the Swift/BAT localization found by Swift/XRT (Source 3 and Source 5,
Capalbi et. al GCN 33348), though neither X-ray source has been
definitively determined the X-ray afterglow. We detect radio sources
coincident with both XRT sources. Our preliminary results are as follows:
Source 3: flux of ~65 microJy (~9 sigma) at the position:
RA(J2000) = 18:43:04.948
Dec(J2000) = -28:50:16.60
with an uncertainty of ~0.3" in each coordinate.
Source 5: flux of ~20 microJy (~3 sigma) at the position:
RA(J2000) = 18:43:06.762
Dec(J2000) = -28:46:48.06
with an uncertainty of ~0.6" in each coordinate.
We thank the VLA staff for quickly approving and executing these
observations."