Changes
SHOC
,/* FITS Header Keywords */
|-
|FRAME = '2015-04-17T14:34:28.000' / Start of Frame Exposure
| This comment is incorrect. It is the time at the ''end'' of the first frame for internal mode, and the time "start" is pressed for external triggering mode.
|-
|ESHTMODE= 0 / Electronic Shuttering Mode
|-
|AIRMASS = 'NA ' / The airmass (sec(z))
| Starting with this keyword, everything here and below has been added in the SAAO software. Airmass comes from the TCS.
|-
|DATE-OBS= '2015-04-17T14:34:26.446239' / The time the user pushed start (UTC)
| Note that during external triggering mode, this does not correspond to any specific timing for the images. The camera started waiting at this time for a trigger from the GPS.
|-
|DOMEPOS = 'NA ' / The dome position
|-
|GPS-INT = ' ' / GPS trigger interval (msec)
| Set by the user on the GPS tab of the web interface. This is the cadence at which GPS pulses are sent. Each pulse triggers a readout on the camera.
|-
|GPSSTART= ' ' / GPS start time (UTC; external)
| Set by the user on the GPS tab of the web interface. This is the time that the first GSP pulse was sent, which corresponds to the readout of the first GPS image. We typically toss the first two images in a GPS triggered sequence because the first is nothing (before the first pulse) and the second has slightly inaccurate timing.
|-
|HA = 'NA ' / The telescope hour angle
