Continued Activity of SGR 0501+4516
ATel #1678; David Palmer (LANL) on behalf of the Swift Team
on 24 Aug 2008; 05:13 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: David M. Palmer (palmer@lanl.gov)
Subjects: X-ray, Gamma Ray, Soft Gamma-ray Repeater
SGR 0501+4516 (ATEL #1676, Barthelmy et al.; and other recent ATELs and GCNs) continues to be active, with 32 bursts detected and identified by Swift-BAT in the 36 hours following the first detected burst at 2008-08-22 12:41:59 UT. (A comparable number of bursts presumably occurred during the intervals when the SGR was behind the Earth as seen from Swift.)
For most of these bursts, Swift was directly observing the source with XRT and UVOT. The SGR is Moon-constrained for XRT and UVOT currently (from ~2008-08-24 02:00 to ~2008-08-26 05:00 UT), however Swift will be pointed to keep the SGR in the BAT field-of-view when possible.
A list of burst times follows. Times are from the BAT onboard trigger, which usually corresponds to an instant somewhere between the onset and the peak of the event, and are not barycentered. Trigger duration is a reasonable proxy for burst duration in most cases. Except for the bursts detected during slews, all have been verified by BAT imaging to have come from the SGR. The brighter bursts, with BAT instrumental fluences above 2000 counts, are marked with asterisks. The very brightest bursts have fluxes in the kiloCrab range.
| SGR 0501+4516 burst times |
|---|
| BAT Trigger time UT | Trig dur (ms) | Notes |
|---|
| 2008-08-22T12:41:59.457 | 64 | * |
| 2008-08-22T13:09:04.353 | 256 | |
| 2008-08-22T13:12:52.697 | 16 | * |
| 2008-08-22T13:20:30 | | slew |
| 2008-08-22T14:17:55.361 | 256 | |
| 2008-08-22T14:34:26.493 | 32 | |
| 2008-08-22T17:29:30.017 | 64 | |
| 2008-08-22T22:24:24.008 | 32 | |
| 2008-08-22T22:36:53.368 | 32 | |
| 2008-08-22T22:53:50.760 | 16 | |
| 2008-08-23T00:28:12.536 | 32 | |
| 2008-08-23T02:11:39 | | * slew 13kcounts |
| 2008-08-23T04:47:48.599 | 16 | * 35kcounts |
| 2008-08-23T06:31:36.571 | 16 | |
| 2008-08-23T06:58:15 | | slew |
| 2008-08-23T08:30:04.191 | 16 | * |
| 2008-08-23T08:34:56.719 | 32 | |
| 2008-08-23T11:07:37.827 | 16 | |
| 2008-08-23T11:27:35.107 | 16 | * 90kcounts |
| 2008-08-23T14:27:37.018 | 64 | |
| 2008-08-23T14:56:26.238 | 64 | * |
| 2008-08-23T16:31:22.326 | 16 | |
| 2008-08-23T17:35:14.362 | 32 | * 17kcounts |
| 2008-08-23T17:35:14.910 | 128 | |
| 2008-08-23T17:59:01.430 | 8 | |
| 2008-08-23T19:08:09.886 | 128 | |
| 2008-08-23T20:49:10.238 | 256 | |
| 2008-08-23T20:53:29.110 | 16 | |
| 2008-08-23T21:09:19.518 | 32 | |
| 2008-08-23T21:11:17.210 | 64 | |
| 2008-08-23T21:11:19.630 | 16 | |
| 2008-08-23T21:13:39.838 | 64 | |
| 2008-08-23T22:37:55.349 | 08 | |
