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Suzaku WAM detections of the current activities from AXP 1E1547.0-5408

ATEL # 1906; 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
on 23 Jan 2009; 17:20 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Kazutaka Yamaoka (

Subjects: Gamma Ray, Request for Observations, Neutron Stars, Pulsars, Transients

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:

Among them, following five events were detected with the Suzaku WAM on-board triggering system, and their finer time resolution light curves (1/64 sec time resolution) are available at:

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.

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