SGR 1550-5418: The Active Episodes of October 2008 and March 2009 as Detected with FGST/GBM

Details SGR 1550-5418: The Active Episodes of October 2008 and March 2009 as Detected with FGST/GBM SGR 1550-5418: The Active Episodes of October 2008 and March 2009 as Detected with FGST/GBM

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1618v&link_type=abstract

American Astronomical Society, HEAD meeting #11, #16.18; Bulletin of the American Astronomical Society, Vol. 41, p.681

Astronomy and Astrophysics

Astronomy

Scientific paper

In early October 2008, SGR 1550-5418 (formerly classified as AXP 1E 1547.0-5408) became active, emitting a series of bursts which triggered the Gamma ray Burst Monitor (GBM) onboard Fermi 7 times. In addition a multitude of un-triggered events were also recorded. The active period lasted for 7 days and the source was not detected as a burster again until it went into an especially intense activity period in January 2009, emitting several hundreds of bursts, with some of them exceptionally bright. After a month of quiescence the source entered a third, less active period, at the end of March 2009. Since that time no further activity has been observed. SGR 1550-5418 was first detected with the Einstein observatory 30 years ago (1E 1547.0-5408) and was classified as a Central Compact Object; recent X-ray and optical observations of the source, however, suggested that it could be a magnetar candidate. Due to the absence of burst emission, the source was originally classified as an Anomalous X-ray Pulsar (AXP). The detection of the three extremely active bursting periods with properties typical of Soft Gamma Repeaters, indicates that the classification of the source as an SGR is more appropriate. We report here on the timing and spectra of the observations obtained with the Fermi/GBM in the first and last active period. These results will be compared with the observations of the January 09 activity period.

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