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Decline in activity of SGR 0501+4516

ATEL # 1683; David Palmer(LANL) on behalf of the Swift Team
on 28 Aug 2008; 1:04 UT
Password Certification: David M. Palmer (palmer@lanl.gov)

Subjects: X-ray, Gamma Ray, Soft Gamma-ray Repeaters

SGR 0501+4516 (ATEL #1675, #1676, #1677, #1678, #1682) has declined in activity. There have been no reported bursts in 43 hours, compared to the previous period with 56 bursts in 87 hours and a largest gap of 8 hours.

Due to the unpredictable nature of these objects, this does not necessarily imply that it has returned to a multi-year (or even multi-day) quiescent stage.

As of the latest available Swift-BAT data, 2008-08-27 22:40 UT, the most recent reported burst from the SGR was detected by Konus-Wind on 2008-08-26 at 03:16:15 (Konus-Wind team, private communication.) The most recent BAT detection was about 8 hours earlier.

The current list of BAT bursts, plus the reported Konus Wind bursts (from GCN #8132) follows. As in ATEL #1676, which this expands, the bursts with more than 2000 counts in the BAT are marked with a '*'.


Trigger time (UTC) Trigger (ms) Notes

2008-08-22 12:41:59 64 *
2008-08-22 13:09:04 256
2008-08-22 13:12:53 16 *
2008-08-22 13:20:30 during slew
2008-08-22 14:17:55 256
2008-08-22 14:34:26 32
2008-08-22 17:29:30 64
2008-08-22 22:24:20 32
2008-08-22 22:36:53 32
2008-08-22 22:53:51 16
2008-08-23 00:28:13 32
2008-08-23 02:11:39 * during slew, 13k BAT counts
2008-08-23 04:47:49 16 * 35k BAT counts, seen by Konus-Wind
2008-08-23 06:31:37 16
2008-08-23 07:01:12 during slew, wrong time in ATEL #1678
2008-08-23 08:30:04 16 *
2008-08-23 08:34:57 32
2008-08-23 11:07:38 16
2008-08-23 11:27:35 16 * 90k BAT counts, seen by Konus-Wind
2008-08-23 14:27:37 64
2008-08-23 14:56:26 64 *
2008-08-23 16:31:22 16
2008-08-23 17:35:14 32 * 17k BAT counts
2008-08-23 17:35:15 128
2008-08-23 17:59:01 8
2008-08-23 19:08:10 128
2008-08-23 20:49:10 256
2008-08-23 20:53:29 16
2008-08-23 21:09:20 32
2008-08-23 21:11:17 64
2008-08-23 21:11:20 16
2008-08-23 21:13:40 64
2008-08-23 22:37:55 8
2008-08-24 00:05:30 128
2008-08-24 00:19:47 8 *
2008-08-24 01:17:55 Seen by Konus-Wind, not by BAT
2008-08-24 01:53:07 32
2008-08-24 02:02:47 32
2008-08-24 02:04:36 32
2008-08-24 06:56:53 32
2008-08-24 08:18:27 32
2008-08-24 08:23:39 16 * double peak
2008-08-24 08:23:39 32
2008-08-24 10:17:37 128
2008-08-24 18:19:38 128
2008-08-24 19:52:53 64 *
2008-08-24 22:30:12 16
2008-08-25 00:46:28 32
2008-08-25 03:19:18 32
2008-08-25 04:48:27 Seen by Konus-Wind, not by BAT
2008-08-25 10:22:03 16
2008-08-25 11:55:32 32
2008-08-25 19:24:09 32
2008-08-26 03:16:15 Seen by Konus-Wind, not by BAT


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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates