Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-03-11
Astrophys.J.696:L74-L78,2009
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Accepted for publication on The Astrophysical Journal Letters
Scientific paper
10.1088/0004-637X/696/1/L74
In January 2009, multiple short bursts of soft gamma-rays were detected from the direction of the anomalous X-ray pulsar 1E 1547.0-5408 by different satellites. Here we report on the observations obtained with the INTEGRAL SPI-ACS detector during the period with the strongest bursting activity. More than 200 bursts were detected at energies above 80 keV in a few hours on January 22. Among these, two remarkably bright events showed pulsating tails lasting several seconds and modulated at the 2.1 s spin period of 1E 1547.0-5408. The energy released in the brightest of these bursts was of a few 10^43 erg, for an assumed distance of 10 kpc. This is smaller than that of the three giant flares seen from soft gamma-ray repeaters, but higher than that of typical bursts from soft gamma-ray repeaters and anomalous X-ray pulsars.
Esposito Paolo
Gotz Diego
Israel Gian Luca
Mereghetti Sandro
Rea Nanda
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