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Spin Period of New Soft Gamma Repeater SGR 0501+4516

ATEL # 1677; E. Gogus (Sabanci Univ.), P. Woods (Dynetics), & C. Kouveliotou (NASA/MSFC), on behalf of a larger collaboration:
on 22 Aug 2008; 21:21 UT
Password Certification: Peter Woods (

Subjects: X-ray, Pulsars, Soft Gamma-ray Repeaters
Referred to by ATEL #: 1682, 1683

We triggered our SGR ToO Program with RXTE following the Swift detection of a burst from the new Soft Gamma Repeater SGR 0501+4516 (Barthelmy et al. 2008, GCN # 8113). A 600 s RXTE observation started on 2008 August 22, 16:39:09 UT. During this pointing we detected one short SGR burst-like event in the PCA data (2-60 keV), confirming that the new source was in the field of view. We searched for a spin period for the new SGR in the 2.5-13.5 keV band PCA event mode data and detected a coherent signal (barycenter corrected) at 0.17334 Hz, corresponding to a spin period of 5.769 0.004 s. A longer RXTE observation of SGR 0501+4516 is currently underway. We thank RXTE planner, Divya Pereira for prompt scheduling.

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