offsetcoord - offset a celestial coordinate pair (ASCA)
offsetcoord fitsfile+ext ra dec
To offset the CRVAL keywords in a FITS image:
Usage: offsetcoord fitsfile+ext ra_off dec_off
or
To offset a coordinate pair, and write result to the screen: Usage: offsetcoord ra_old dec_old ra_off dec_off where, "ra_off/dec_off" are RA/DEC offsets in arcmins, and, "ra_old/dec_old" are RA/DEC in degrees.
The offsets are simply added (i.e., ra_new = ra_old + offset / 60.0)
For futher details and a list of ASCA offsets, see ASCAGOF web page:
https://lheawww.gsfc.nasa.gov/users/evg/updatecoord.html