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ESO
SCIENCE
DATA
PRO DUCTS
STANDARD

Do c .
No .
G E N -
SPE -
ESO -
33000 -
5335,
I s s ue
5



Ad d e n d u m

Da t e :
1 6 /0 2 /2 0 1 6



Gran
Telescopio
CANARIAS
Data
Products

The
purpose
of
this
section
is
to
characterise
fully
reduced
images
and
spectra
taken
with
the
Gran
Telescopio
CANARIAS
(GTC)
using
the
instruments
OSIRIS
and
CanariCam.
In
particular,
it
is
addressed
to
the
data
providers,
especially
to
the
ESO
PIs
whose
Large
Programmes
were
carried
out
at
GTC,
who,
accordingly
to
the
ESO
policies
stating
that
Phase
3
is
mandatory
for
Large
Programmes,
have
to
prepare
and
submit
reduced
products
to
the
ESO
Archive.

List
of
approved
ESO/GTC
Large
Programmes
·



Programme
182.B-
2005
Alonso-
Herrero
et
al.
·



Programme
182.C-
2018
Sing
et
al.
·



Programme
184.A-
2018
Perez-
Gonzalez
et
al.
·



Programme
184.C-
2004
Snellen
et
al.
·



Programme
184.A-
2005
Miley
et
al.
·



Programme
186.A-
2012
SАnchez-
Portal
et
al.
·



Programme
186.D-
2013
Clementini
et
al.
·



Programme
188.A-
2022
Aragon-
Salamanca
et
al.
·



Programme
189.D-
2007
Kotak
et
al.


Data
Types
Images
and
1d
spectra
are
the
primary
data
products.
Other
type
of
ancillary
data
products
may
be
optionally
associated.
The
keyword
PRODCATG
defines
the
data
product
category:

PRODCATG
Description
SCIENCE.IMAGE SCIENCE.SPECTRUM Single
image
stored
in
the
primary
HDU
Single
target
one-
dimensional
spectrum
and
is
associated
data.
In
the
1D
spectrum
binary
table
format
(one
primary
header
and
a
single
extension
containing
the
data).



The
modes
listed
in
Table
2
are
covered
in
this
document.
To
be
noted
that
the
following
modes
of
CanariCam
are
not
supported:
polarimetry,
spectropolarimetry
and
cronography.

In
general,
the
rules
defining
data
format
and
metadata
for
the
different
categories
of
data
products
illustrated
in
the
SDPS
(especially
for
generic
images,
sect.
3.1,
1-
d
spectra,
sect.
4
and
catalogues
sect.
5)
apply
to
GTC
reduced
data
as
well.






1





Table
1:
FITS
keyword
definitions.



Type
Keyword
(S)
ORIGIN Description
Observatory
or
facility
where
the
data
were
originally
obtained
(not
where
data
processing
was
done).
In
this
case:
ORIGIN



= 'GRANTECAN'

/
Facility


(S)
(S)


TELESCOP INSTRUME

Telescope
designation:
TELESCOP= 'GTC '



/
Telescope
name
/
Instrument
name


INSTRUME= 'OSIRIS ' or

INSTRUME= 'CANARICAM'



/
Instrument
name

(L)
(S)


NOESODAT PROG_ID PROGIDi

To
indicate
that
the
product
includes
non-
ESO
data
NOESODAT=



T

/
Includes
non-
ESO
data


The
identification
code
assigned
to
each
observing
run
by
the
ESO
Observing
Programme
Committee
(OPC)
in
the
format
PPP.C-
NNNN(R).
If
more
than
one
the
value
shall
be
PTOG_ID='MULTI'
and
the
individual
programme
IDs
shall
be
stored
in
keywords
PROGIDi,
where
i
is
an
integer
index
between
1
and
99,
with
no
leading
zeros.
In
addition
to
this
keywords
the
use
of
GTCPRGID
and
GTCOBID
to
be
adopted
from
the
original
data,
is
recommended.

(L)


MULTI_OB

TRUE
if
resulting
from
a
combination
of
multiple
observation
blocks.
This
flag
indicates
that
the
data
product
includes
observations
obtained
in
more
than
one
observation
block.
Number
of
raw
science
data
files
that
were
combined
to
generate
this
data
product.
Calibration
data
files
do
not
contribute
to
this
count.
Technique
used
during
the
observation.
Refer
to
Table
2
to
have
indications
about
the
values
that
this
keyword
can
assume.
Electromagnetic
wave
band
coverage
in
terms
of
the
wavelength
interval
in
units
of
nanometers
(nm).
These
keywords
are
mandatory
for
OSIRIS
imaging
products
taken
in
narrow
band
(tunable
filters)
mode
and
for
the
spectral
products.


(I)


NCOMBINE

(S)


OBSTECH

(R)


WAVELMIN WAVELMAX

Specific
for
imaging



(S)


FILTER

Filter
name.
It
applies
only
to
imaging
products.
It
must
be
dropped
from
the
headers
of
spectroscopic
products,
or
it
can
be
renamed
to
OFILTER.
Photometric
zeropoint
that
relates
the
pixel
data
to
total
magnitudes
(MAG)
according
to



(R)


PHOTZP




2



MAG=-
2.5*log(data)+PHOTZP
Together
with
this
it
is
also
recommended
to
indicate
the
(1
sigma)
uncertainty
of
the
photometric
zeropoint
in
the
keyword
PHOTZPER.

Specific
for
spectra


(S)


DISPELEM

The
name
of
the
main
dispersive
element.
For
OSIRIS
it
shall
be
set
to
the
GRISM
identifier
(ex.
`R1000R')
while
for
CanariCam
to
the
GRATING
(ex.
'LowRes-
10').



Not
applicable
keywords

The
keywords
OBIDi
and
PROVi,
specific
to
data
taken
with
ESO
telescopes
for
which
the
raw
frames
are
also
archived
in
the
ESO
Science
Archive
Facility,
do
not
apply
to
GTC
data.



Table
2:
Examples
of
values
for
the
keyword
OBSTECH.


Instrument

Mode
OSIRIS
Imaging Broad
band
(SDSS
filters)
Narrow
band
(Tunable
filters)
Medium
band
(SHARDS
filters)
Spectroscopy CanariCam
Imaging Long
slit



OBSTECH
'IMAGE'
'IMAGE,FABRY-PEROT' 'IMAGE'


'SPECTRUM'
'IMAGE,CHOPNOD' 'IMAGE,NODDING' 'IMAGE,CHOPPING' 'IMAGE,STARE'


Spectroscopy




'SPECTRUM,CHOPNOD' 'SPECTRUM,NODDING' 'SPECTRUM,CHOPPING' 'SPECTRUM,STARE'



Table
3:
Sample
FITS
header
of
a
OSIRIS
Broad
Band
Image.




SIMPLE BITPIX NAXIS NAXIS1 NAXIS2 EXTEND BUNIT = = = = = = = 'ADU' T / file does conform to FITS standard -32 / number of bits per data pixel 2 / number of data axes 954 / Axis length 1960 / Axis length T / FITS dataset may contain extensions / Physical unit of array values




3



ORIGIN DATE

= 'GRANTECAN'

/ Facility

= '2015-01-22T15:27:20'/ file creation date (YYYY-MM-DDThh:mm:ss UT) / Telescope ' / Instrument name T / Includes non-ESO data / Filter name / Target designation

TELESCOP= 'GTC' INSTRUME= 'OSIRIS NOESODAT= FILTER OBJECT RA DEC = 'i_SDSS' = 'GRB130528A-ri' = =

140.851866 / [deg] Image centre RA (J2000) -30.39136 / [deg] Image centre DEC (J2000) 2000. / Standard FK5 ' / Coordinate system 100. / Total integration time per pixel (s) 100. / Total integration time of all exposures (s) 56444.099242 / Start of observations 56444.100399 / End of observations / ESO programme identification code F / TRUE if resulting from multiple observations ' / Technique of observation / Data product category / Type of flux calibration / R.A. in tangent plane projection / DEC. in tangent plane projection

EQUINOX = RADECSYS= 'FK5 EXPTIME = TEPXTIME= MJD-OBS = MJD-END =

PROG_ID = '182.C-2018(A)' MULTI_OB= OBSTECH = 'IMAGE

PRODCATG= 'SCIENCE.IMAGE' FLUXCAL = 'ABSOLUTE' CTYPE1 CTYPE2 CD1_1 CD1_2 CD2_1 CD2_2 CRPIX1 CRPIX2 CRVAL1 CRVAL2 PHOTZP = 'RA---TAN' = 'DEC--TAN'

= -7.0655555555555E-05 / Transformation matrix element = = = -630.5 = 946. = 140.851592113002 = 87.3008277672256 = 28.891 0. / Transformation matrix element 0. / Transformation matrix element / Ref pix of axis 1 / Ref pix of axis 2 / RA at Ref pix in decimal degrees / DEC at Ref pix in decimal degrees / Photometric zeropoint MAG=-2.5*log(data)+PHOTZP / Photometric system VEGA or AB / Spatial resolution (arcsec) / 5-sigma limiting AB mag for point sources / Saturation limit for point sources (AB mag)

= 7.06555555555555E-05 / Transformation matrix element

PHOTSYS = 'AB' PSW_FWHM= 0.571 ABMAGLIM= 24.356 ABMAGSAT= 15.720

PROCSOFT= 'Gemini IRAF package v1.13.1' / Data reduction software/version n. REFERENC= '2014A&A...569A..93J' CHECKSUM= 'DEWbDDTZDDTaDDTY' DATASUM = ' END 0' / Bibliographic reference / HDU checksum / Data unit checksum




Table
4:
Sample
FITS
header
of
a
OSIRIS
long
slit
spectrum.






4



SIMPLE BITPIX NAXIS EXTEND ORIGIN DATE

= = = = = 'GRANTECAN' = '2014-01-21T12:59:24'

T / conforms to FITS standard 8 / Number of bits per data pixel 0 / Number of data axes T / Extensions may be present / Facility / Date FITS file was generated / Telescope / Instrument Name T / Includes non-ESO data / GRISM identifier / Reference frame for spectral coordinates / Name of the object observed T / TRUE if extended / [deg] Spectroscopic target position (J2000.0) / [deg] Spectroscopic target position (J2000.0) / Standard FK5 (years) / Equatorial coordinate system / Exposure Time in seconds / Total integration time of all exposures (s) 56575.86861 / Start of observations (days) 56576.10039 / End of observations (days) / ESO programme identification code F / TRUE if resulting from multiple observations / Technique of observation / Data product category / Type of flux calibration F / TRUE if normalised to the continuum / [nm] Minimum wavelength / [nm] Maximum wavelength / [nm] Wavelength bin size F / TRUE if all source flux is captured / Uncertainty in flux scale (%)

TELESCOP= 'GTC ' INSTRUME= 'OSIRIS ' NOESODAT= DISPELEM= 'R1000B ' SPECSYS = 'TOPOCENT' OBJECT = 'M2549 30mx4'

EXT_OBJ = RA DEC = 9.1921336778457 = 42.1139717981329

EQUINOX = 2000. RADECSYS= 'FK5 ' EXPTIME = 1800. TEXPTIME= 1800. MJD-OBS = MJD-END =

PROG_ID = '180.C-0045(A)' MULTI_OB= OBSTECH = 'SPECTRUM' PRODCATG= 'SCIENCE.SPECTRUM' FLUXCAL = 'ABSOLUTE' CONTNORM= WAVELMIN= 362.899008 WAVELMAX= 787.560337 SPEC_BIN= 0.19 TOT_FLUX= FLUXERR = -2.

PROCSOFT= 'Gemini IRAF package v1.13.1' / Data reduction software/version n. REFERENC= '2015A&A...580L..15P' SNR = 2.955 / Bibliographic reference

/ Average signal to noise ratio per pixel / Reference spectral resolving power / No. of combined raw science frames

SPEC_RES= 1018. NCOMBINE= 4 CHECKSUM= '3048vtyb3DCVdeF982w' DATASUM = 0 END

===> xtension 1 XTENSION= 'BINTABLE' / binary table extension




5



BITPIX NAXIS NAXIS1 NAXIS2 PCOUNT GCOUNT

=8 =3 = 16392 =1 =0 =1

/ array data type / number of array dimensions / number of bytes per row / number of rows / number of group parameters / number of groups / VO Data Model / VO Publishing Authority

VOCLASS ='SPECTRUM V2.0' VOPUB TITLE OBJECT RA DEC = 'ESO/SAF'

= 'M2549_30mx4_Osiris_LSS_2007-12' / Dataset title = 'M2549 30mx4' = 9.1921336778457 = 42.1139717981329 / Name of the object observed / [deg] Spectroscopic target position (J2000.0) / [deg] Spectroscopic target position (J2000.0) / [deg] Aperture diameter / [s] Total elapsed time / [d] MJD mid exposure / [nm] Mean wavelength / [nm] Bandpass width = Wmax - Wmin / number of table fields / Length of the data array / Label for field 1

APERTURE= 0.000222 TELAPSE = 1842.111 TMID = 56575.9845

SPEC_VAL= 545.5 SPEC_BW = 387.0 TFIELDS = 3 NELEM TTYPE1 TUTYP1 TFORM1 TUNIT1 TUCD1 TTYPE2 TUTYP2 TFORM2 TUNIT2 TUCD2 TTYPE3 TUTYP3 TFORM3 TUNIT3 TUCD3 TDMIN1 TDMAX1 TDMIN2 TDMAX2 = 2049 = 'WAVE '

= 'spec:Data.SpectralAxis.Value' / IVOA data model element for field = '2049E ' = 'Angstrom' = 'em.wl' = 'FLUX ' = '2049E ' = 'erg/cm2/s/Angstrom' / Data format of field 1 / Physical unit of field 1 / UCD for field 1 / Label for field 2 / Data format of field 2 / Physical unit of field 2

= 'spec:Data.FluxAxis.Value' / IVOA data model element for field 2

= 'phot.flux.density;em.wl;src.net;meta.main' / UCD for field 2 = 'ERR ' / Label for field 3

= 'spec:Data.FluxAxis.Accuracy.StatError' / IVOA data model element = '2049E' = 'erg/cm2/s/Angstrom' / Data format of field 3 / Physical unit of field 3

= 'stat.error;phot.flux.density;meta.main' / UCD for field 3 = 3628.9900878906 = 7875.603369140699 = -3.4141710211100E-18 = 1.16298513042610E-15 / [Angstrom] Min Value for Wavelength / [Angstrom] Max Value for Wavelength / [erg/cm2/s/Angstrom] Min Value for Flux / [erg/cm2/s/Angstrom] Max Value for Flux / Extension name

EXTNAME = 'SPECTRUM' CHECKSUM= '3287rbGYSUdh738TTg8r' DATASUM = '34876582954873' END




6