Bursts from Soft Gamma Repeater SGR 1806-20

ATel #16838; David M Palmer (LANL) on behalf of the Swift/BAT Team
on 1 Oct 2024; 03:54 UT
Credential Certification: David M. Palmer (palmer@lanl.gov)

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The BAT instrument on Swift has detected two bursts from the Soft Gamma Repeater SGR 1806-20 in the past two weeks.

These are the first bursts from this source detected by BAT since a sequence in February-March 2023. This earlier sequence includes the burst reported in GCN #33451 (Brivio et al.) and GCN #33473 (Dafcikova et al.) as well as 5 additional bursts.

The burst times, trigger durations, and image peak strengths for these bursts are

2023-02-23T23:55:01 0.032 1.17 +/- 0.08
2023-02-24T18:52:18 0.032 0.48 +/- 0.07
2023-02-28T05:21:48 0.032 0.65 +/- 0.06
2023-02-28T05:27:01 0.064 0.25 +/- 0.04
2023-02-28T18:14:05 0.032 0.33 +/- 0.04
2023-03-10T21:00:35 0.032 6.73 +/- 0.30
2024-09-19T09:17:38 0.032 0.47 +/- 0.06
2024-09-28T01:09:28 0.016 0.50 +/- 0.05
where trigger durations (in s) approximate the burst duration and fluences (in Crab-seconds) are derived from the 15-50 keV on-board imaging during that trigger duration.