National Aeronautics and Space Administration

OSO-8 Software:
Example 1 - Extract a lightcurve from raw rates data

Osofindfast, for a given sky position determines times when that position was viewed by the A, B or C detector. This routine generates two output files, one for the A and B and one for the C detector. The file names listed are of the form oso8_csxabc_XXXX.fits where XXXX is the mission day number since January 1975 and ranges from 176 to 1369. Osorat operates on the raw rates data and extracts a 160 ms lightcurve.

Using osofindfast (step 1) Run the perl script OSOFINDFAST. This script determines the days of the mission when the source is MOST likely to be in the detector FOV (the `good' observing days). For example, consider the source A0620 (coordinates R.A.(1950)=95.046, Dec (1950)=-0.32)

% osofindfast
Equinox [ 1950 ]: 
Source RA [ 0 ]: 95.046
Source Dec. [ 0 ]: -0.32
Output listing filename: a0620
Output orbit file lists ? (y/n): n
Precessed RA and DEC values to 1975 epoch : 
               95.3653672590687 -0.332627716087411 
Opening output list for C detector : a0620_c 
Opening output list for A detector : a0620_a 
 
 ** OSOFINDFAST.PL 1.0.0 finished **

% cat a0620_c
oso8_csxabc_272.fits
oso8_csxabc_273.fits
oso8_csxabc_274.fits
oso8_csxabc_275.fits

Using osorat (step 2)

% osorat
Equinox (d/f 1950)[1950] 
RA in hh mm ss.s or degrees[95.046] 
DEC in dd mm ss.s or degrees[-0.32] 
Detector: 1, 2, or 3, for A, B, or C[3] 
File containing list of input OSO-8 rates files[a0620_c]
Name of output file[a0620]
 Open output file a0620_1
 Detector  DET-C


 Calculating srce count corrns for lightcurve : a0620_1
 
 **** OSORAT 1.3.0   finished *********