The raw images contain a two-dimensional array of 16-bit unsigned integers that characterize the photon flux at each pixel on the CCD chip. The image is located at the primary FITS extension, as described in Section B.1. Each FITS image has FITS header that contains both standard keywords and ROTSE specific keywords. The header values are listed below, with a few fields left blank to be filled in when the image is corrected. These values are described in Section C.2.
BITPIX number of bits per data pixel
NAXIS number of data axes
NAXIS1 length of data axis 1
NAXIS2 length of data axis 2
EXTEND FITS file may contain extensions
BZERO offset data range
BSCALE default scaling factor
OFFSET1 Camera upper left frame x
OFFSET2 Camera upper left frame y
XFACTOR Camera x binning factor
YFACTOR Camera y binning factor
DATE-OBS Date of start of OBS in GMT
LOCTIME Exposure local start time
MJD Julian Date - 2400000.5
OBSTIME Start Time of OBS in GMT (sod)
ALTITUDE Observatory altitude (meters)
LATITUDE Observatory latitude (deg)
LONGITUD Observatory longitude (deg)
NCOADD Number of co-added images
CTYPE1 RA, TAN projection used
CRPIX1 pixel at reference point
CRVAL1 RA at the reference point
CDELT1 increment per pixel (degrees)
CUNIT1 physical units of axis 1
CTYPE2 DEC, TAN projection used
CRPIX2 pixel at reference point
CRVAL2 DEC at the reference point
CDELT2 increment per pixel (degrees)
CUNIT2 physical units of axis 2
PC001001 coordinate rotation matrix (WCS)
PC002002 coordinate rotation matrix
PC001002 coordinate rotation matrix
PC002001 coordinate rotation matrix
CAM_ID Two-digit ID tag for instrument
OFFSTRA Camera offset in RA (deg*cos(dec))
OFFSTDEC Camera offset in Dec (deg)
OPTICS Optics manufacturer and model
OPTICSN Optics serial number
FOCUS Focus position (mm)
SATCNTS Saturation Level
NSAT Number of Saturated Pixels
ENCRA Encoder RA
ENCDEC Encoder Dec
CAMTYPE Camera manufacturer and model
CAMSN Camera serial number
CARDSN PC card serial number
PATH Path name of FITS file
FILENAME FITS file name
NFRAME Frame number
EXPTIME Exposure time, seconds
EFFTIME Eff. co-added time, seconds
COOLER TE cooler status
CAMTEMP Camera temperature (C)
AMP 0:Left, 1:Right, 2:Both
MEAN Mean of SUBFRAME
STDDEV Std dev. of SUBFRAME
MEDIAN Median of SUBFRAME
MIN Minimum pixel value of SUBFRAME
MAX Maximum pixel value of SUBFRAME
SUBFRAME SBF bounds (xmin:xmax,ymin:ymax)
BMEAN Mean of BIASFRAME
BSTDDEV Std dev. of BIASFRAME
BMEDIAN Median of BIASFRAME
BMIN Minimum pixel value of BIASFRAME
BMAX Maximum pixel value of BIASFRAME
BIASFRAM BSF bounds (xmin:xmax,ymin:ymax)
OBSTYPE Observation type
TRIG_NUM Trigger number
TRIG_T Trigger time (sec-of-day)
PKT_T Time trigger sent (sec-of-day)
TRIG_RA Trigger RA (deg)
TRIG_DEC Trigger Dec (deg)
TRIG_ERR Trigger Error (deg)
INTEN Trigger intensity
LPHASE Lunar Phase (= -1.0 when down)
DMOON Ang. distance to Moon (deg)
ELEV Elevation (deg)
AZIMUTH Azimuth (deg)
NEARTILE Four nearest Sky Patrol frames
MOUNT Mount manufacturer and model
MOUNTSN Mount serial number
MOUNTRA Right Ascension J2000 (deg)
MOUNTDEC Declination J2000 (deg)
MOUNTERR Mount position error (deg)
TEMPOUT Outside temperature (F)
WINDSPD Wind speed (mph)
WINDDIR Wind direction (deg)
BAROM Barometric pressure (inches Hg)
HUMIDITY Outside humidity (%)
DEWPOINT Dew point (F)
SKYMON Sky Monitor voltage
CLOUDS Cloud Monitor voltage
VPRECIP Vaisala Precipitation voltage