origin,s,h,"ASC",,,"Source of FITS file"
creator,s,h,"hrc_process_events - Version DS 8.5",,,"tool that created this output"
ascdsver,s,h,"8.5.1.1",,,"Processing system revision"
tlmver,s,h,"P009",,,"Telemetry revision number (IP&CL)"
observer,s,h,"Dr. Martin Weisskopf",,,"Principal investigator"
object,s,h,"Crab",,,"Source name"
revision,i,h,2,,,"Processing version of data"
checksum,s,h,"RnCURlBRRlBRRlBR",,,"HDU checksum updated 2013-03-07T20:28:55"
datasum,s,h,"2129517502",,,"data unit checksum updated 2013-03-07T19:32:27"
content,s,h,"EVT1",,,"What data product"
hduspec,s,h,"HRC Level 0 Data Products ICD Version 1.5",,,"ICD reference"
hdudoc,s,h,"ASC-FITS-2.0: McDowell, Rots: ASC FITS File Designers Guide",,,""
hduvers,s,h,"1.0.0",,,""
hduclass,s,h,"OGIP",,,""
hduclas1,s,h,"EVENTS",,,""
hduclas2,s,h,"ALL",,,""
asolfile,s,h,"pcadf478913534N001_asol1.fits",,,"aspect offset files"
adccorf,s,h,"NONE",,,"ADC correction file used"
bpixfile,s,h,"hrcf14684_000N002_bpix1.fits",,,"Bad pixel file used"
gaincorf,s,h,"hrcsD1999-07-22t_gmapN0002.fits",,,"gain correction file used"
degap,s,h,"hrcsD1999-07-22gaplookupN0003.fits",,,""
hypfile,s,h,"hrcsD1999-07-22fptestN0004.fits",,,"hyperbolic test file used"
tapring,s,h,"hrcsD1999-07-22tapringN0002.fits",,,"tapring coeff file used"
flatfile,s,h,"hrcsD1999-07-22eftestN0001.fits",,,"flatness test file used"
satfile,s,h,"hrcsD1999-07-22sattestN0002.fits",,,"saturation test file used"
ampsffil,s,h,"hrcsD1999-07-22amp_sf_corN0001.fits",,,"AMF_SF Correction file used"
widthres,i,h,2,,,"width threshold"
rand_sky,r,h,0.0,,,"pixel randomization"
date,s,h,"2013-03-07T19:27:52",,,"Date and time of file creation"
date-obs,s,h,"2013-03-05T23:19:28",,,"Observation start date"
mjd_obs,r,h,56356.971854771,,,"Modified Julian date of observation"
ds_ident,s,h,"ADS/Sa.CXO#obs/14684",,,"dataset identifier"
dataclas,s,h,"OBSERVED",,,"default"
radesys,s,h,"ICRS",,,"default"
date-end,s,h,"2013-03-06T05:32:09",,,"Observation end date"
timesys,s,h,"TT",,,"Time system"
mjdref,r,h,50814.0,,,"MJD zero point for times [d]"
timezero,r,h,0.0,,,"Clock correction [s]"
timeunit,s,h,"s",,,"Time unit"
btimnull,r,h,476257071.00862,,,"Basic Time offset (s)"
btimrate,r,h,0.25625001383844,,,"Basic Time clock rate (s/VCDUcount)"
btimdrft,r,h,2.6965848575146e-18,,,"Basic Time clock drift (s/VCDUcount^2)"
btimcorr,r,h,0.0,,,"Correction applied to basic time rate (s)"
timeref,s,h,"LOCAL",,,"Time reference (barycenter/local)"
tassign,s,h,"SATELLITE",,,"Time assigned by clock"
clockapp,b,h,yes,,,"Clock correction applied"
tierrela,r,h,1.0e-09,,,"Short-term clock stability"
tierabso,r,h,5.0e-05,,,"Absolute precision of clock correction"
timversn,s,h,"ASC-FITS-2",,,"Timing system definition"
tstart,r,h,478912768.25218,,,"Observation start time (MET) [s]"
tstop,r,h,478935129.14089,,,"Observation end time (MET) [s]"
startmjf,i,h,80967,,,"Major frame ctr value at start of data"
obs_mode,s,h,"POINTING",,,"Observation mode"
startmnf,i,h,4,,,"Start minor frame ctr at start of data"
startobt,r,h,0.0,,,"On-Board MET close to STARTMJF and STARTMNF"
stopmjf,i,h,80991,,,"Major frame ctr value at stop of data"
stopmnf,i,h,0,,,"Stop minor frame ctr at end of data"
timepixr,r,h,0.5,,,"Time stamp reference as bin fraction"
timedel,r,h,1.5625e-05,,,"Time resolution of data (in seconds)"
mission,s,h,"AXAF",,,"Mission"
telescop,s,h,"CHANDRA",,,"Telescope"
instrume,s,h,"HRC",,,"Instrument"
sim_x,r,h,-1.4281808131318,,,"SIM focus pos [mm]"
sim_y,r,h,0.0,,,"SIM orthogonal axis pos [mm]"
sim_z,r,h,250.4660330802,,,"SIM translation stage pos [mm]"
foc_len,r,h,10070.0,,,"HRMA focal length [mm]"
detnam,s,h,"HRC-S",,,"Detector"
grating,s,h,"LETG",,,"Grating"
obs_id,s,h,"14684",,,"Observation id"
ra_pnt,r,h,83.631803414307,,,"Pointing RA [deg]"
dec_pnt,r,h,22.010981998022,,,"Pointing Dec [deg]"
roll_pnt,r,h,272.81037839847,,,"Pointing Roll [deg]"
ra_targ,r,h,83.631667,,,"Observer's specified target RA [deg]"
dec_targ,r,h,22.015667,,,"Observer's specified target Dec [deg]"
defocus,r,h,0.10515582627252,,,"SIM defocus [mm]"
ra_nom,r,h,83.631803414307,,,"Nominal RA [deg]"
dec_nom,r,h,22.010981998022,,,"Nominal Dec [deg]"
roll_nom,r,h,272.81037839847,,,"Nominal Roll [deg]"
tlm_fmt,i,h,2,,,"Format in which this data was telemetered"
datamode,s,h,"OBSERVING",,,"Data mode"
obi_num,i,h,0,,,"Obi number"
seq_num,s,h,"501818",,,"Sequence number"
histnum,i,h,436,,,""
limfile1,s,h,"/home/ascds/DS.sap/data/hrc_gti_all_lim.fits",,,"GTI Limit file"
title,s,h,"Pre-planned Target of Opportunity Observations of the Crab Nebula upon the Occurrence of a Gamma-Ray Flare",,,"Proposal title"
rangelev,i,h,126,,,"range_switch_level"
ampsfcor,b,h,yes,,,"TRUE=apply_amp_sf_corr;  FALSE=NOT_apply;"
acsys1,s,h,"RAW:AXAF-HRC-1.1",,,"reference for raw chip coord system"
acsys2,s,h,"CHIP:AXAF-HRC-1.1",,,"reference for degap corrected chip coord system"
acsys3,s,h,"TDET:HRC-2.7S",,,"reference for tiled detector coord system"
acsys4,s,h,"DET:ASC-FP-2.3",,,"reference for focal plane coord system"
acsys5,s,h,"SKY:ASC-FP-2.3",,,"reference for sky coord system"
asptype,s,h,"KALMAN",,,""
ontime,r,h,19645.151063085,,," [s]"
dtcor,r,h,0.99473934590183,,,"Dead time correction"
livetime,r,h,19541.804718636,,,"Ontime multiplied by DTCOR"
exposure,r,h,19541.804718636,,,"Total exposure time, with all known corr. appl."
aimpfile,s,h,"telD1999-07-23aimptsN0002.fits",,,""
geomfile,s,h,"telD1999-07-23geomN0006.fits",,,""
skyfile,s,h,"telD1999-07-23skyN0002.fits",,,""
tdetfile,s,h,"telD1999-07-23tdetN0001.fits",,,""
shellfil,s,h,"telD1999-07-23sgeomN0001.fits",,,""
dtffile,s,h,"hrcf14684_000N002_dtf1.fits",,,""
maskfile,s,h,"hrcf14684_000N002_msk1.fits",,,""
fltfile,s,h,"hrcf14684_000N002_std_flt1.fits",,,""
dy_avg,r,h,1.0739860949,,,"Mean DY during observation [mm]"
dz_avg,r,h,0.81535166432,,,"Mean DZ during observation [mm]"
dth_avg,r,h,-0.0045631388436,,,"Mean DTHETA during observation [deg]"
caldbver,s,h,"4.5.6",,,""