[vsnet-grb-info 7347] Ongoing activity of AXP/SGR 1E1547.0-5408
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Mon Feb 23 01:56:05 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 8913
SUBJECT: Ongoing activity of AXP/SGR 1E1547.0-5408
DATE: 09/02/22 16:55:58 GMT
FROM: Valentin Pal'shin at Ioffe Inst <val at mail.ioffe.ru>
S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P.
Oleynik, M. Ulanov and T. Cline, on behalf of the Konus-Wind team,
report:
Two very bright SGR bursts triggered Konus-Wind
at 2009-02-21 T0=55653.101 s UT (15:27:33.101) and 2009-02-22
T0=1694.689 s UT (00:28:14.689). The first was also detected by
Fermi/GBM (trigger 256922856). The GBM location is consistent with the
AXP/SGR 1E1547.0-5408 position. The Konus ecliptic latitude response
indicates that the source of these bursts is in the south ecliptic
hemisphere. So, we believe they originated from AXP/SGR 1E1547.0-5408.
Preliminary estimations yields for the first burst
a fluence of ~1.6x10^-5 erg/cm2, a peak flux on 2ms time scale of
~2.3x10^-4 erg/cm2/s (both in the 20-300 keV), and Ep ~50 keV for the
time-integrated spectrum,
and for the second burst a fluence of 4.3x10^-6 erg/cm2, a peak flux on
2ms time scale of ~1.4x10^-4 erg/cm2/s (both in the 20-300 keV), and Ep
~40 keV for the time-integrated spectrum.
The Konus-Wind light curves of these bursts are available at
http://www.ioffe.ru/LEA/SGRs/090221_T55653/
and
http://www.ioffe.ru/LEA/SGRs/090222_T01694/
Since January 29 (Golenetskii et al., 8863) seven bright bursts from the
AXP/SGR 1E1547.0-5408 have triggered Konus-Wind:
------------------------------------
Date T0, s UT
------------------------------------
2009-02-03 8722.534 (02:25:22.534)
2009-02-03 70382.351 (19:33:02.351)
2009-02-04 73637.930 (20:27:17.930)
2009-02-12 43144.456 (11:59:04.456)
2009-02-14 70303.255 (19:31:43.255)
2009-02-21 55653.101 (15:27:33.101)
2009-02-22 01694.689 (00:28:14.689)
------------------------------------
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