GCN Circular 17804

W. Fong (Univ. of Arizona) reports:

"We observed the position of the short-duration GRB 150424A (Beardmore et
al., GCN 17743
Not found
 
 
) with the Karl G. Jansky Very Large Array (VLA) beginning on
2015 Apr 25.073 UT (18.02 hr post-burst) at a mean frequency of 9.8 GHz. In
1 hour of observations, we detect a faint radio source at the position:

RA(J2000) = 10:09:13.37
Dec(J2000) = -26:37:51.49

with an uncertainty of 0.5" in each coordinate. This position is coincident
with the position of the X-ray afterglow (Goad et al., GCN 17749
Not found
 
 
) as well
as the position of the optical afterglow (Perley and McConnell., GCN 17745
Not found
 
 
;
Malesani et al., GCN 17756
Not found
 
 
; Kann et al., GCN 17757
Not found
 
 
; Butler et al., GCN
17762
Not found
 
 
).

We measure a 9.8 GHz flux density of ~31 microJy. To assess the nature of
this radio source, we obtained two additional sets of VLA observations
starting at 4.67 and 7.88 days after the burst. The source is no longer
detected in each of these observations, as well as a deep, combined image,
to 3-sigma limits of 29 microJy and 20 microJy, respectively.

Due to the fading of the radio source, as well as the positional
coincidence with the X-ray and optical afterglows, we consider this source
to be the radio afterglow of GRB 150424A.

We thank the VLA staff for quickly executing these observations."