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The 2.1-s anomalous X-ray pulsar 1E 1547.0-5408 exhibited an X-ray outburston 2009 January 22, emitting a large number of short bursts. The wide-band all-sky monitor (WAM) on-board Suzaku detected at least 254 bursts in the160keV-6.2MeV band over the period of January 22 00:57-17:02 UT from thedirection of 1E 1547.0-5408. One of these bursts, which occurred at 06:45:13,produced the brightest fluence in the 0.5-6.2MeV range, with an averaged0.16-6.2MeV flux and extrapolated 25 keV-2 MeV fluence of about 3x10-6 erg cm-2s-1 and about 3x10-4 erg cm-2, respectively. After pile-up corrections, thetime-resolved WAM spectra of this burst were well-fitted in the 0.16-6.2MeVrange by two-component models; specifically, a blackbody plus an optically thinthermal bremsstrahlung or a combination of a blackbody and a power-lawcomponent with an exponential cutoff. These results are compared with previousworks reporting the persistent emission and weaker short bursts followed by thesame outburst.

Sub-MeV Band Observation of a Hard Burst from AXP 1E 1547.0-5408 with the Suzaku Wide-band All-sky Monitor