This directory contains recent data from the Green Bank Interferometer
of the National Radio Astronomy Observatory in Green Bank, WV.

File names are the names of the sources. 

The column headings are as follows:

col. 1 - Mod. Julian Date of observation (JD-2400000.5).
col. 2 - Local Hour Angle of observation (hours).
col. 3 - Flux Density in Janskys at  2.25 GHz
col. 4 - Flux Density in Janskys at  8.3 GHz.
col. 5 - Spectral index.
col. 6 - Estimated 1-sigma error of col. 3.
col. 7 - Estimated 1-sigma error of col. 4.

Flagged data are indicated by Flux density of -1.0 in col. 3 or 4, 
-10.0 in col.5, and errors of 0.0 in col. 6 or 7.

Note that in the interest of making the data available quickly, 
bad data points may not have been flagged as such.  Use at your 
discretion!

=====================================================================
==  USERS OF THESE DATA SHOULD ACKNOWLEDGE THE GBI-NASA MONITORING ==
==  PROGRAM.  THE FOLLOWING SENTENCE SHOULD APPEAR IN ANY          ==
==  PUBLICATION USING THESE DATA:                                  ==
==                                                                 ==
==   The Green Bank Interferometer is a facility of the National   ==
==   Science Foundation operated by the NRAO in support of         ==
==   NASA High Energy Astrophysics programs.                       ==
=====================================================================


===========
CALIBRATION 
===========
     A flux density calibration procedure similar to that reported in  
Waltman etal (1994) has been employed here.  The flux densities of 
0237-233, 1245-197, and 1328+254 were determined using observations of 
1328+307 (3C 286).  The flux density of 3C 286 was based on the scale of Baars 
etal (1977), and the assumed values were 11.85 Jy at 2.25 GHz and 5.27 Jy at 
8.3 GHz.  

     The flux densities for the program sources have been calibrated using  
the four calibration sources listed above, weighted by the difference in time 
between the observations of the source and calibrator sources observed within 
24 hours of the source observation.  The flux densities listed are vector
(arithmetic) scan averages of 30-sec records for weak (strong) sources.

     The GBI is noise dominated below 15-20 mJy at both frequencies.  Above
this flux level, the expected noise level is flux dependant.
One sigma errors for the random noise expected as a function of flux at 
each frequency are included in the data  files.  However, hour angle gain 
effects in the flux densities may exceed 20% at 8.3 GHz at large hour angles 
due to atmospheric effects and pointing errors.  These have not been removed 
in these data files.