Swift/BAT detections of bursts from SGR 1935+2154 and SGR 1806-20
ATel #15752; David M. Palmer on behalf of the Swift/BAT team
on 11 Nov 2022; 01:02 UT
Credential Certification: David M. Palmer (palmer@lanl.gov)
Subjects: X-ray, Gamma Ray, Soft Gamma-ray Repeater, Fast Radio Burst, Magnetar
BAT confirms that SGR 1935+2154 is in a moderately-high bursting state as reported in GCN #32922 (Wood for Fermi/GBM, 2022) with 4 identified bursts in the past 2 days.
In addition, BAT has detected and identified two recent bursts from SGR 1806-20. Therefore this source should be considered as a candidate source when SGR-like bursts are detected by non-imaging instruments.
The current list of recent SGR 1935+2154 bursts detected and identified by BAT, starting after the heavy activity between 2021-12-24 and 2022-01-18, is:
SGR 1935+2154
2022-05-30 20:32:26
2022-06-16 07:11:52
2022-10-10 01:39:09
2022-10-10 09:15:42
2022-10-10 14:12:45
2022-10-12 21:49:37
2022-10-12 23:26:42
2022-10-13 00:52:38
2022-10-13 00:55:26
2022-10-13 01:02:53
2022-10-13 02:36:00
2022-10-13 05:55:44
2022-10-13 13:42:58
2022-10-14 17:00:56
2022-10-16 21:14:58
2022-10-16 21:20:52
2022-10-17 13:00:10
2022-10-17 13:15:44
2022-11-09 14:33:10
2022-11-10 06:39:03
2022-11-10 09:54:23
2022-11-10 11:49:04
The current list of SGR 1806-20 bursts detected and identified by BAT in 2022 is:
SGR 1806-20
2022-05-14 11:14:10
2022-08-23 23:49:11
2022-10-21 17:17:00
2022-10-25 18:42:31
All times are UTC at the spacecraft.
BAT has a field-of-view (FOV) that covers ~1.5 sr (~1/8 of the celestial sphere) so this list represents only a corresponding fraction of these sources' actual activity. Out-of-FOV bursts can be detected as rate spikes in BAT's detectors, but cannot be unambiguously ascribed to a given source without additional information, such as from another instrument.
