We present observations of pulsed radio emission from the transient anomalous X-ray pulsar XTE J1810-197. Data were obtained over a period of 100 days beginning in 2006 May using a baseband recording system at the 26 m Mount Pleasant radio telescope operated by the University of Tasmania. Pulsed emission was detected in three frequency bands centered on 1.4, 4.8, and 8.4 GHz. The mean flux density varied significantly within all bands, but we obtained fewer detections toward the end of the observing period, and the monitoring program was eventually abandoned. Most interestingly, we observed changes in the pulse-to-pulse emission characteristics. The variance of the flux in 10 s integrations changed significantly during the span of our observations, but we did not have sufficient data to identify a clear secular trend. In addition, timing measurements confirmed that the neutron star's spin period derivative changed significantly on or around MJD 53935. © 2007. The American Astronomical Society. All rights reserved.

Item Type:	Refereed Article
Research Division:	Physical Sciences
Research Group:	Astronomical sciences
Research Field:	Galactic astronomy
Objective Division:	Expanding Knowledge
Objective Group:	Expanding knowledge
Objective Field:	Expanding knowledge in the physical sciences
UTAS Author:	Hotan, AW (Dr Aidan Hotan)
UTAS Author:	Long, SR (Ms Sally Long)
UTAS Author:	Dickey, JM (Professor John Dickey)
ID Code:	48422
Year Published:	2007
Funding Support:	Australian Research Council (DP0559613)
Web of Science® Times Cited:	3
Deposited By:	Physics
Deposited On:	2007-08-01
Last Modified:	2008-04-04
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