VLA Monitoring of SGR 1935+2154 on 2020, April 30
ATel #13693; Vikram Ravi (Caltech), Gregg Hallinan (Caltech), Casey J Law (Caltech) on behalf of the realfast and STARE2 collaborations
on 1 May 2020; 03:59 UT
Credential Certification: Casey Law (claw@astro.caltech.edu)
Subjects: Radio, Soft Gamma-ray Repeater, Fast Radio Burst
Referred to by ATel #: 13713
We report a second epoch of radio monitoring observations of SGR 1935+2154 obtained on 2020 Apr 30 14:34 UTC as part of a community service observing program with the Karl. G. Jansky Very Large Array. On 2020 April 28 14:34:25 UTC this source produced a millisecond-timescale radio burst with properties analogous to extragalactic fast radio bursts (ATel #13681, #13684), accompanied by a short (~0.5 s), hard X-ray flare (ATel #13685, #13686, #13687, #13688). Wideband data were obtained at center frequencies of 6 GHz (C-band) and 22 GHz (K-band) with the VLA in its C configuration, as used in the previous VLA epoch (Atel #13690). No persistent radio source was detected at the position of SGR 1935+2154, with preliminary 3-sigma upper limits of 22 uJy and 72 uJy at C and K band respectively. The realfast commensal fast transient search system ran a full FRB search (DM = 0 - 3000, time widths 20 - 160 ms) on the VLA C band data with a sampling time of 20 ms. No detections were found stronger than 7.5 sigma, corresponding to an 8-sigma fluence limit of 0.2 Jy ms. We thank the staff of the VLA for rapidly scheduling and carrying out these observations for the benefit of the community.
