Pulsar Monitoring Telescope (PMT) -- NRAO 85-3, 25m telescope
00may19
The current status of this facility is summarized in the attached postscript
document. Frank Ghigo has recently
created an
NRAO web page for the telescope. Anyone interested in
use of the 85ft PMT, or in archival data, please contact me (address
below). Monitor, control & data processing are outlined in
85ft.m+c. This makes reference to the coherent
dispersion removal processor,
GBPP which is installed in Green Bank
and currently dedicated to 85ft use.
We are monitoring five short period
pulsars (J0437-47, B0531+21, B0833-45, B1937+21, B2145-07)
at two frequencies (327 and 610 MHz) with 85-3, one of the three 25m antennas
of the former
Green Bank Interferometer
that are run by NRAO on behalf of the NASA, USNO and NRL.
The current pulsar schedule for the full 24 hours of 85-3 is either the
many pulsar or the
0950+08 intensive schedule; 00may update.
Timing at the 85ft telescope from the interferometer lab uses the Sigma Tau (ST)
maser in the clock room. See plot or
table for recent (ST-UTC GPS).
A sample data average (postscript)
from 610-MHz observing with 85ft telescope in Green Bank are available
for the Crab pulsar. This is a full Stokes
parameters presentation done by S. Sallmen.
In 1996 May we (Lundgren/Hankins/Moffet et al) conducted a giant pulse observation
using the VLA at 1.4 GHz to both sample the data and create a trigger that was
sent via internet/socket to program in Green Bank that computed remaining delay to
the dispersed pulse at 610 MHz.
Recent
papers and conference reports based on 85ft observations are available.
In November 1999 observations were done in conjunction with the 32m at
Torun to provide an ephemeris for the Crab pulsar for Steve Eikenberry's
USA XRay Satellite/Palomar observations.
In December 1999 several pulsars
were added to the 610-MHz observing list to support Shami Chatterjee's VLBA
astrometry observations. Reports on the first round of reduction of this
data follow:
0809+74 report and template fit
0823+26 report and template fit
0919+09 report and template fit
1642-03 report and template fit
1929+10 report and template fit
Vela Glitch No. 16 preliminary analysis
of Green Bank 85ft data at 610 MHz. See also Tasmanian result by
R. Dodson et al.
which is also reported in
IAU Circular 7347. Our preliminary analysis indicates df/f ~ 4.6E-6 making this the
largest glitch in Vela and in any other pulsar; dfdot/fdot ~ -1E-2.
Toney Minter observed PSR B0329+54 on 1998 Aug 28 with the VLBA and detected
the presence of interstellar fringing at xx MHz. The archive
of data from 1998 can be explored for
the scintillation properties during this interval. We record profiles in 32
channels of 0.87 MHz centered at 610 MHz.
The typical data have excellent SNR.
All four Stokes parameters [H^2, V^2, Real(HV), Imag(HV)] are sampled.
The "ascii log" gives an inventory of observations;
the number to the left (###x) of each entry is the CDrom directory; 2 per CDrom.
Anish Roshi started using 85-3 in 2000 May for deep recombination line observations
at 610 MHz toward the galactic center.
D. Backer
510-642-5128
510-642-3411 (fax)
dbacker@astro.berkeley.edu
Astronomy Department & Radio Astronomy Laboratory
601 Campbell Hall
University of California
Berkeley, CA 94720-3411