The Host of AT2019osy

See our GCN circular at https://gcn.gsfc.nasa.gov/gcn3/25801.gcn3

Figure 1 The host galaxy of AT 2019osy / ASKAP J005547.4-270433 observed in the F140W (1.4 micron) broadband filter of the Wide-Field Camera 3 on HST on 2019 Sep 17.9 UT. The image is approximately 15″ from top to bottom. North is up.

Figure 2 The position of the ALMA source is shown by the green circle, whose 0.05″ radius accounts for both the one-sigma uncertainty in the position of the radio source and the HST-to-ALMA astrometry cross-calibration error.