origin,s,h,"ASC",,,"Source of FITS file"
creator,s,h,"acis_process_events - Version DS10.9",,,"tool that created this output"
ascdsver,s,h,"10.9.4",,,"Processing system revision"
asolfile,s,h,"pcadf25031_000N001_asol1.fits",,,""
thrfile,s,h,"acisD2005-07-01evtspltN0002.fits",,,""
tlmver,s,h,"P015",,,"Telemetry revision number (IP&CL)"
revision,i,h,1,,,"Processing version of data"
checksum,s,h,"9geHBZc99dcEAZc9",,,"HDU checksum updated 2021-05-10T11:46:19"
datasum,s,h,"189001117",,,"data unit checksum updated 2021-05-10T11:35:04"
content,s,h,"EVT1",,,"What data product"
hduspec,s,h,"ACIS Telemetry Products: Level 0 to ASC Archive ICD Rev 2.11",,,"ICD r"
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",,,""
pix_adj,s,h,"NONE",,,"Subpixel adjustment algorithm"
rand_sky,r,h,0.0,,,""
subpixfl,s,h,"NONE",,,""
rand_pi,r,h,1.0,,,""
date,s,h,"2021-05-10T11:28:27",,,"Date and time of file creation"
mjd-obs,r,h,59343.052460049,,,"Modified Julian date of observation"
date-obs,s,h,"2021-05-09T01:15:32",,,"Observation start date"
date-end,s,h,"2021-05-09T11:37:15",,,"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,732606390.47041,,,"Basic Time offset (s)"
btimrate,r,h,0.25625001578285,,,"Basic Time clock rate (s / VCDUcount)"
btimdrft,r,h,1.9513085039394e-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,,,"default"
tierrela,r,h,1.0e-09,,,"default"
tierabso,r,h,5.0e-05,,,"default"
timversn,s,h,"ASC-FITS-2",,,"Timing system definition"
tstart,r,h,736910132.54826,,,"Observation start time (MET) [s]"
tstop,r,h,736947435.88807,,,"Observation end time (MET) [s]"
obs_mode,s,h,"POINTING",,,"Observation mode"
startmjf,i,h,165,,,"Major frame ctr value at start of data"
startmnf,i,h,14,,,"Start minor frame ctr at start of data"
startobt,r,h,0.0,,,"On-Board MET close to STARTMJF and STARTMNF"
stopmjf,i,h,1251,,,"Major frame ctr value at stop of data"
stopmnf,i,h,61,,,"Stop minor frame ctr at end of data"
timepixr,r,h,0.5,,,"default"
dataclas,s,h,"OBSERVED",,,"default"
radesys,s,h,"ICRS",,,"default"
timedel,r,h,0.00285,,,"timedel Lev1 [s]"
mission,s,h,"AXAF",,,"Mission"
telescop,s,h,"CHANDRA",,,"Telescope"
sim_x,r,h,-0.68282252473119,,,"SIM focus pos [mm]"
sim_y,r,h,0.0,,,"SIM orthogonal axis pos [mm]"
sim_z,r,h,-190.14006604987,,,"SIM translation stage pos [mm]"
foc_len,r,h,10070.0,,,"HRMA focal length [mm]"
instrume,s,h,"ACIS",,,"Instrument"
grating,s,h,"HETG",,,"Grating"
detnam,s,h,"ACIS-56789",,,"Detector"
ra_pnt,r,h,275.92090670822,,,"Pointing RA [deg]"
dec_pnt,r,h,-30.3626342056,,,"Pointing Dec [deg]"
roll_pnt,r,h,86.145526420294,,,"Pointing Roll [deg]"
ra_targ,r,h,275.919042,,,"Observer's specified target RA [deg]"
dec_targ,r,h,-30.361281,,,"Observer's specified target Dec [deg]"
defocus,r,h,0.0014449365687057,,,"SIM defocus [mm]"
ra_nom,r,h,275.92090670822,,,"Nominal RA [deg]"
dec_nom,r,h,-30.3626342056,,,"Nominal Dec [deg]"
roll_nom,r,h,86.145526420294,,,"Nominal Roll [deg]"
readmode,s,h,"CONTINUOUS",,,"Read mode"
acsys1,s,h,"CHIP:AXAF-ACIS-1.0",,,"reference for chip coord system"
acsys2,s,h,"TDET:ACIS-2.2",,,"reference for tiled detector coord system"
acsys3,s,h,"DET:ASC-FP-1.1",,,"reference for focal plane coord system"
acsys4,s,h,"SKY:ASC-FP-1.1",,,"reference for sky coord system"
gainfile,s,h,"acisD2000-01-29gain_ctiN0008.fits",,,""
cti_corr,b,h,yes,,,""
cti_app,s,h,"PPPPPBPBPP",,,""
ctifile,s,h,"acisD2020-01-01ctiN0009.fits",,,""
mtlfile,s,h,"acisf25031_000N001_mtl1.fits",,,""
tgaincor,s,h,"T",,,""
tgainfil,s,h,"acisD2020-11-01t_gain_biN0002.fits",,,""
grd_file,s,h,"acisD1996-11-01gradeN0004.fits",,,""
corners,i,h,2,,,"num adjacent side pix > threshold to include co"
gradesys,s,h,"ASCA",,,"grade system: ASCA, ACIS, or USER"
bpixfile,s,h,"acisf25031_000N001_bpix1.fits",,,""
datamode,s,h,"CC33_FAINT",,,"Data mode"
run_id,i,h,1,,,"Science run index"
fsw_vers,i,h,56,,,"ACIS flight software version number"
startbep,i,h,210060437,,,"BEP timer value at TSTART"
stopbep,i,h,3720895637,,,"BEP timer value at TSTOP"
histnum,i,h,474,,,""
title,s,h,"4U1820-30: Gravitational Redshift of an Outflowing Neutron Star Atmosphere",,,"Proposal title"
observer,s,h,"Dr. Claude Canizares",,,"Principal investigator"
object,s,h,"4U1820-30",,,"Source name"
ds_ident,s,h,"10.25574/25031",,,"Dataset Identifier: DOI"
obs_id,s,h,"25031",,,"Observation id"
obi_num,i,h,0,,,"Obi number"
seq_num,s,h,"402283",,,"Sequence number"
ontime,r,h,23084.644735694,,,"Sum of GTIs [s]"
ontime7,r,h,23084.644735694,,,"Sum of GTIs [s]"
ontime5,r,h,24917.330075145,,,"Sum of GTIs [s]"
ontime6,r,h,15463.266629219,,,"Sum of GTIs [s]"
ontime8,r,h,17204.090971708,,,"Sum of GTIs [s]"
ontime9,r,h,18313.065668225,,,"Sum of GTIs [s]"
livetime,r,h,22994.470342195,,,"Livetime [s]"
livtime7,r,h,22994.470342195,,,"Livetime [s]"
livtime5,r,h,24819.996754539,,,"Livetime [s]"
livtime6,r,h,15402.863243949,,,"Livetime [s]"
livtime8,r,h,17136.88749135,,,"Livetime [s]"
livtime9,r,h,18241.530255459,,,"Livetime [s]"
exposure,r,h,22994.470342195,,,"Exposure time [s]"
exposur7,r,h,22994.470342195,,,"Exposure time [s]"
exposur5,r,h,24819.996754539,,,"Exposure time [s]"
exposur6,r,h,15402.863243949,,,"Exposure time [s]"
exposur8,r,h,17136.88749135,,,"Exposure time [s]"
exposur9,r,h,18241.530255459,,,"Exposure time [s]"
dtcor,r,h,0.99609375,,,"Dead time correction"
time_adj,s,h,"TARGET",,,"time adjustment algorithm"
asptype,s,h,"KALMAN",,,""
biasfil7,s,h,"acisf736911112N001_1_bias0.fits",,,"bias file used: CCD 7"
biasfil5,s,h,"acisf736911112N001_2_bias0.fits",,,"bias file used: CCD 5"
biasfil6,s,h,"acisf736911112N001_3_bias0.fits",,,"bias file used: CCD 6"
biasfil8,s,h,"acisf736911112N001_4_bias0.fits",,,"bias file used: CCD 8"
biasfil9,s,h,"acisf736911112N001_5_bias0.fits",,,"bias file used: CCD 9"
fp_temp,r,h,154.73605347,,,"Focal Plane Temperature [K]"
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",,,""
fltfile,s,h,"acisf25031_000N001_flt1.fits",,,""
maskfile,s,h,"acisf25031_000N001_msk1.fits",,,""
pbkfile,s,h,"acisf736911294N001_pbk0.fits",,,""
dy_avg,i,h,0,,,"Mean DY during observation [mm]"
dz_avg,i,h,0,,,"Mean DZ during observation [mm]"
dth_avg,i,h,0,,,"Mean DTHETA during observation [deg]"
oclkpair,i,h,8,,,"# of pairs of overclock pixels per output"
orc_mode,i,h,0,,,"Output register clocking mode"
sum_2x2,i,h,0,,,"On-chip summing. 0:None; 1:Sum 2x2"
fep_ccd,s,h,"x75689",,,"CCD to FEPID mapping, fep0 is left most digit"
caldbver,s,h,"4.9.5",,,""