[vsnet-grb-info 6510] Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516

Sat Aug 23 06:39:40 JST 2008

TITLE:   GCN CIRCULAR
NUMBER:  8118
SUBJECT: Discovery of  the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
DATE:    08/08/22 21:39:33 GMT
FROM:    Chryssa Kouveliotou at MSFC  <chryssa.kouveliotou at nasa.gov>

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E. Gogus (Sabanci University), P. Woods (Dynetics), and C. Kouveliotou =
(NASA/MSFC), report on behalf of a larger collaboration:

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 =B1 0.004 s.=20

A longer RXTE observation of SGR 0501+4516 is currently underway.  We =
thank the RXTE planner, Divya Pereira, for prompt scheduling.

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<TITLE>Discovery of  the Spin Period of the New Soft Gamma Repeater SGR =
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E. Gogus (Sabanci =
University), P. Woods (Dynetics), and C. Kouveliotou (NASA/MSFC), report =
on behalf of a larger collaboration:

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 =B1 0.004 s.

<P DIR=3DLTR><SPAN LANG=3D"tr"><FONT SIZE=3D2 FACE=3D"Arial TUR">A =
longer RXTE observation of SGR 0501+4516 is currently underway.&nbsp; We =
thank the RXTE planner, Divya Pereira, for prompt =
scheduling.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"el"></SPAN><SPAN LANG=3D"el"></SPAN><SPAN =
LANG=3D"tr"></SPAN></P>

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