RADIO TIMING OF THE CRAB PULSAR DURING RECENT GAMMA-RAY FLARE
ATel #2889; C. M. Espinoza (JBCA, Manchester, UK), C. Jordan (JBCA, Manchester, UK), B. W. Stappers (JBCA, Manchester, UK), A. G. Lyne (JBCA, Manchester, UK), P. Weltevrede (JBCA, Manchester, UK), I. Cognard (LPC2E CNRS Orleans and Nancay observatory, France), G. Theureau (LPC2E CNRS Orleans and Nancay observatory, France)
on 30 Sep 2010; 12:21 UT
Credential Certification: Patrick Weltevrede (patrick.weltevrede@manchester.ac.uk)
Subjects: Radio, Neutron Star, Supernova Remnant, Pulsar
We report radio timing observations of the Crab pulsar during
the recent enhancement in gamma-ray emission from the Crab
Nebula region, reported by AGILE on Sept. 22 (ATel #2855) and
confirmed and more recently followed up by Fermi (ATel #2861).
Daily monitoring at 608 MHz with the 13-m telescope at Jodrell
Bank Observatory combined with higher-frequency (between 1.4 and
2.0 GHz) monitoring with
the Nancay and Lovell radio telescopes shows no evidence for a
glitch within the last 60 days. There is a small gradual increase
of the rotation spin-down rate near the time of the gamma-ray
flare, but this is consistent with the timing noise which is
seen at other times when no gamma-ray flare has been reported.
We also find no evidence for significant changes in the
dispersion measure at this time.
A preliminary study of the pulse profiles shows no variation in
pulsed flux nor pulse shape.
