TITLE: GCN CIRCULAR NUMBER: 8857 SUBJECT: AXP 1E1547.0-5408: RHESSI observations up to 400 keV DATE: 09/01/28 01:40:47 GMT FROM: Eric Bellm at UCB/SSL E. Bellm, D. M. Smith, and K. Hurley on behalf of the RHESSI team report: On January 22, 2009, RHESSI observed repeated outbursts from AXP 1E1547.0-5408 (Gronwall et al., GCN 8833). After a single ~2 second burst at 03:50:38 UT, a series of bursts was recorded from 05:14:03--05:26:51 UT. A second series was observed from 06:43:48--06:55:57 UT. The periods without observed emission are attributable to SAA passages and Earth occultation. The brightest burst was observed at 06:48:05 UT. This burst showed an initial spike with a peak count rate of 2.6E5 counts/s over a 10 ms interval and emission to 400 keV. The spike was followed by the pulsing tail (~2 s period) reported by Mereghetti et al. (GCN 8841) using INTEGRAL SPI-ACS. A previous burst at 06:45:13.54 UT may have been brighter, as its peak showed evidence of saturation. A one minute complex of bursts beginning at 05:17:40 UT showed emission to 250 keV. RHESSI observed a fast spike from the SGR at 05:18:32.45 UT. This event had an initial peak with a background-to-peak rise time of 12 ms and FWHM of 16 ms. A shoulder after the initial peak extended the total duration (T90) to 70 ms. This spike was also observed by INTEGRAL SPI-ACS. A lightcurve for this burst is available at http://ssl.berkeley.edu/ipn3/1E1547/rhessi.pdf [GCN OPS NOTE(29jan09): Per author's request, the missing "7" was added to the URL.]