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This is a Q-band observation with fast switching. 2 different
cycle times are used, because the slew time changes through out the
observation.
This file was used to observe 3C273 in continuum mode at
Q-band. Several flux calibrators as well as tipping scans are
included.
Observing strategy:
- Start with a tipping scan to determine zenith opacity
- Go to the flux calibrator 0410+769 and do an X-band pointing
scan
- Observe 0410+769 at Q-band
- Go to a strong source close to the target source and do an
X-band pointing
- Make a fast switching scan (cycle time 130 sec with 50 on
calibrator and 80s on target). Total length ca 30min.
- Go back to the pointing source and make another pointing
scan.
- Make a second fast switching scan (cycle time 130 sec with 40
s on calibrator 0552+379 and 90 sec on target 0539+354)
- Go to another flux calibrator (3C286) and do an X-band
pointing.
- Finish with observing 3C286 at Q-band.
This is the resulting observe file. Parts of the file are
marked in color, with explanations below. These are things you need
to look for in your observe file, to make sure the schedule is
correct.
/.DSTST 2160
//* ***
//* *** NRAO VLA Observe Program, Version U4.0.5, 1999.01.06
//* ***
//* *** Observation day 58,215 at 06 00 00 LST, 1999.11.20 02:14:40 MST.
//* ***
//* *** Observer
//* *** Debra Shepherd Phone
//* *** NRAO, Socorro Office: (505)835-7398
//* *** During observation: (505)835-7398
//* ***
//* ***
//* ***
//* *** E-Mail address
//* *** dshepher@aoc.nrao.edu
//* ***
//* *** Observing mode(s): Continuum
//* ***
//* *** Special Instructions
//* *** All Q band antennas
//* ***
//* ***
//* ***
//* *** Date Prepared: 1999.11.18 17:50:22 MST.
//* ***
QTIP 06 26 00 21 20 00.0000 +20 00 00.000C QQ TE 0000
//DS 10
//LO 51.6 13.0 3690 3740 0000
//FISF 100.000000 200.000000
0410+769 06 30 25 04 10 45.6057 +76 56 45.301C XX IRC 0000 2.21
//DS 10
//LO 13.4 13.4 3940 3890
//FISF 100.000000 200.000000
0410+769 06 32 53 04 10 45.6057 +76 56 45.301C QQ C 0000T 0.70
//DS 10
//LO 51.6 13.0 3690 3740 0000
//FISF 100.000000 200.000000
0555+398 06 37 32 05 55 30.8056 +39 48 49.166C XX IRA 0000 6.20
//DS 10
//LO 13.4 13.4 3940 3890
//FISF 100.000000 200.000000
0552+379 07 10 11 05 52 17.9380 +37 54 25.281C QQ C 0000T 0.60
//DS 3
//LO 51.6 13.0 3690 3740 0000
//FISF 100.000000 200.000000
//OF NOD SKY 05 39 27.6600 +35 40 43.000 50 80
0555+398 07 13 12 05 55 30.8056 +39 48 49.166C XX IRA 0000 6.20
//DS 10
//LO 13.4 13.4 3940 3890
//FISF 100.000000 200.000000
0552+379 07 50 50 05 52 17.9380 +37 54 25.281C QQ C 0000T 0.60
//DS 3
//LO 51.6 13.0 3690 3740 0000
//FISF 100.000000 200.000000
//OF NOD SKY 05 39 27.6600 +35 40 43.000 40 90
1331+305 07 57 09 13 31 08.2882 +30 30 32.960C XX IRA 0000 5.23
//DS 10
//LO 13.4 13.4 3940 3890
//FISF 100.000000 200.000000
1331+305 08 00 00 13 31 08.2882 +30 30 32.960C QQ A 0000T 1.49
//DS 10
//LO 51.6 13.0 3690 3740 0000
//FISF 100.000000 200.000000
| 21 20 00.0000 |
For a tipping scan this is the
azimuth (in degrees) at which the tip should be performed. The
important thing here is to avoid shadowing in the compact C and D
configurations. |
| +20 00 00.000 |
The Dec determines whether the tip is
done from low to high elevation, or from high to low
elevation. Close to 23 degrees means from low to high elevations,
while nearer to 55 degrees means the pass goes from high to low
elevations. |
| TE |
This defines a tipping scan (set by specifying "Tipping scan" in the OBSERVE Source Page). |
| XX |
XX defines the observing frequency. Since this is a pointing
scan, it should be in X-band. |
| IR |
This defince a referenced pointing scan (set by specifying
"Det. ref. point." in the OBSERVE Source Page). |
| 10 |
The integration time in seconds. Make sure this is 10 for your pointing scan. |
| T |
This T shows that you are applying
the pointing corrections to the observing scan (set by specifying
"Referenced Pointing" in the OBSERVE Source Page). |
| 05 52 17.9380 +37 54 25.281 |
RA and Dec of the first source in the
fast switching cycle (here the calibrator) |
| 05 39 27.6600 +35 40 43.000 |
RA and Dec of the second source in
the fast switching cycle (here the target source) |
| //OF NOD SKY |
Fast switching is determined by this 'off-set' card in 'NOD SKY' mode |
| 50 80 |
The amount of time spent on first and second source during
the fast switching cycle (50 sec and 80 sec respectively). Move
time is included. |
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