From: Vicky Kaspi Date: February 5, 2007 6:53:16 PM PST To: Stephen Thorsett Cc: Margaret Anne Livingstone Subject: Re: Fwd: copy of the RXTE proposal(s)? (fwd) Here's info on the RXTE proposals we submitted.  Note my grad student Maggie Livingstone did the bulk of the work on this and is observing co-PI. Title: TIMING THE RADIO-QUIET PULSAR PSR J1811-1925 AND TRACKING DISPERSION MEASURE CHANGES IN RADIO-DIM PULSARS FOR GLAST Abstract: The young, energetic, radio-quiet pulsar, PSR J1811-1925, is a prime target for GLAST. Second only to Geminga in spin-down flux of radio-quiet pulsars, it is very likely that this pulsar will be a source of gamma-rays. RXTE timing of this noisy pulsar will allow a coherent fold of the scarce gamma-ray photons over the period of a year. The three faint radio pulsars PSRs J0205+6449, J1930+1852 and J1617-5055 are sources of interest for GLAST. Tracking dispersion measure changes with RXTE in support of single radio frequency observations is important to maintain an accurate timing solution for use in the analysis of GLAST data for pulsations. Also, we put in a ToO proposal in case someone finds an energetic glast target so that there will be RXTE time to time it: Title: RXTE TIMING OF NEW ENERGETIC PULSARS FOR GLAST Abstract: GLAST is expected to detect many new gamma-ray pulsars, and hopefully solve problem of unidentified gamma-ray sources. However, detecting pulsars requires phase-coherent monitoring to provide a pulse ephemeris with which to fold the gamma-ray data. This is because of the paucity of gamma-ray photons, which demands ~year long integration times, coupled with the timing noise and glitches seen in the best GLAST targets. For radio-quiet pulsars, regular RXTE monitoring is the only practical option for coherent timing. We propose to time any radio-quiet energetic young X-ray pulsar discovered during Cycle 12 with RXTE, to provide an ephemeris for GLAST. These timing observations will be interesting for measuring braking indexes and studying glitching behavior in energetic pulsars. Vicky *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*- Victoria M. Kaspi Associate Professor Lorne Trottier Canada Research Chair McGill University Physics Department Rutherford Physics Building, 3600 University Street Montreal, Quebec, Canada  H3A 2T8 Email: vkaspi@physics.mcgill.ca Phone: 514-398-6412           Fax: 514-398-3733 URL: http://www.physics.mcgill.ca/~pulsar *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-