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RXTE ToO Observations of AXP 1E 1841-04.5 in Kes 73 Post-Burst

ATEL # 2602; R. Dib (McGill), F. P. Gavriil (NASA/GSFC), V. M. Kaspi (McGill)
on 8 May 2010; 1:30 UT
Password Certification: Rim Dib (

Subjects: X-ray, Pulsars

On May 06, 2010 at UT 14:37:44 the Swift Burst Alert Telescope (BAT) triggered and located a short X-ray burst with position consistent with the location of AXP 1E 1841-0.45, located in supernova remnant Kes 73 (GCN #10722).

We obtained a target-of-opportunity observation of duration 5 ks with RXTE on May 06, 2010 at UT 15:39:05 using the Proportional Counter Array in GoodXenon mode. Preliminary analysis of these data shows that the pulsed flux in the 2-11 keV band was a factor of 2.02 +/- 0.06 higher than that obtained from averaging our regular RXTE monitoring observations of this source in the same energy band in the 200 days preceding the burst. However we find no evidence for additional bursts, nor for any change in the total count rate. In addition, we set a preliminary 3 sigma upper limit on the fractional frequency change of any spin-up glitch of 0.0+/2.5E-7.

Additional RXTE ToO observations are planned.

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R. E. Rutledge , Editor
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