Swift J1843.5-0343 is a 42.5 second Pulsar
ATel #3121; T. E. Strohmayer (NASA/GSFC), C. B. Markwardt (NASA/GSFC)
on 26 Jan 2011; 05:39 UT
Credential Certification: Tod Strohmayer (tod.strohmayer@nasa.gov)
Subjects: X-ray, Star, Transient, Pulsar
Referred to by ATel #: 3169
RXTE observed the recently discovered transient Swift J1843.5-0343 (ATel
#3109) for 5.5 ks beginning January 25, 2011 at 21:51:22 (UTC).
A power spectral analysis reveals strong pulsations with a period of
42.5 s (un-barycentered), indicating this source is an X-ray pulsar. The
average fractional pulsed amplitude, (max-min)/(max+min), is
approximately 5.2%, and the pulse has little harmonic content.
The spectrum is well modeled by a cut-off power law, with power law
photon index 0.5 and high energy exponential cut-off of 10.1 keV. The
fitted absorption is 6.7e22 /cm2. The X-ray fluxes in the 2-10, 10-20
and 20-40 keV bands are 2.25, 2.45 and 1.75 in units of 1 x 10^{-10}
erg/cm2/s. We have not attempted to correct for any potential
contaminating flux from the galactic ridge (the ridge passes through the
center of the PCA collimator field of view).
Additional RXTE observations are planned. We encourage follow-up
observations in other wavebands.
