[vsnet-grb-info 7274] AXP 1E1547.0-5408: Suzaku WAM detections of the current activity

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8845
SUBJECT: AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
DATE:    09/01/23 15:56:03 GMT
FROM:    Kazutaka Yamaoka at Aoyama Gakuin U  <yamaoka at phys.aoyama.ac.jp>

Y. Terada, M. Tashiro, Y. Urata, A. Endo, K. Onda, N. Kodaka, 
K. Morigami, T. Sugasahara, W. Iwakiri (Saitama U.), M. Ohno, 
M. Kokubun, M. Suzuki, T. Takahashi (ISAS/JAXA), K. Yamaoka,
S. Sugita (Aoyama Gakuin U.), T. Enoto, K. Nakazawa, K. Makishima
(Univ. of Tokyo), Y.E. Nakagawa, T. Tamagawa (RIKEN), T. Uehara, 
T. Takahashi, Y. Fukazawa, C. Kira, Y. Hanabata (Hiroshima U.),
E. Sonoda, M. Yamauchi, H. Tanaka, R. Hara, N. Ohmori, K. Kono,
H. Hayashi, (Univ. of Miyazaki), S. Hong (Nihon U.), 
N. Vasquez (Tokyo Tech), on behalf of the Suzaku WAM team, report:

The Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range 
of 50 keV - 5 MeV detected the current burst activities most likely
arising from the AXP 1E1547.0-5408, as reported by Swift BAT
(Gronwall et al., GCN 8833), INTEGRAL SPI-ACS (Savchenko et al., GCN 8837) 
and Fermi GBM (Connaughton et al., GCN 8835). Over a period of 
January 21 23:49:41 - January 22 23:47:00 (UT), the WAM detected about 
250 bursts with durations of less than 5 seconds above 5.5 sigma. The most 
intense event with a T90 duration of 5 seconds was observed on 2009-01-22 
08:17:28 (UT), and also detected by INTEGRAL SPI-ACS (Mereghetti et al., GCN 8841). 
The light curves with 1 sec time resolution for all these bursts are available 
at the following URL: 
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/sgraxp/untrig/sgraxp_table_2009.html

Among them, following five events were detected with the Suzaku WAM 
onboard triggering system, and their finer time resolution light curves 
(1/64 sec time resolution) are available at:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/sgraxp/trig/sgraxp_table_2009.html

--------------------------------------------------------------------------
 Trigger Time (UT)      T90 duration (s)
--------------------------------------------------------------------------
 2009-01-22 01:28:59       0.14  
 2009-01-22 02:46:56       1.5 
 2009-01-22 04:34:52	   0.41 (the first event)
                           2.0  (the second event including its precursor)     
 2009-01-22 15:10:34       0.13
 2009-01-22 17:02:55       0.36
--------------------------------------------------------------------------

Spectral analyses are now in progress, and results will be reported later.