J/AJ/136/2306 SDSS-II Supernova survey, 2005 (Holtzman+, 2008)
The Sloan Digital Sky Survey. II:
photometry and supernova Ia light curves from the 2005 data.
Holtzman J.A., Marriner J., Kessler R., Sako M., Dilday B., Frieman J.A.,
Schneider D.P., Bassett B., Becker A., Cinabro D., DeJongh F., Depoy D.L.,
Doi M., Garnavich P.M., Hogan C.J., Jha S., Konishi K., Lampeitl H.,
Marshall J.L., McGinnis D., Miknaitis G., Nichol R.C., Prieto J.L.,
Riess A.G., Richmond M.W., Romani R., Smith M., Takanashi N., Tokita K.,
Van Der Heyden K., Yasuda N., Zheng C.
<Astron. J., 136, 2306-2320 (2008)>
=2008AJ....136.2306H 2008AJ....136.2306H
ADC_Keywords: Surveys ; Supernovae ; Photometry, SDSS
Keywords: supernovae: general - techniques: photometric
Abstract:
We present ugriz light curves for 146 spectroscopically-confirmed or
spectroscopically-probable Type Ia supernovae (SNe) from the 2005
season of the Sloan Digital Sky Survey-II Supernova (SN) survey. The
light curves have been constructed using a photometric technique that
we call scene modeling, which is described in detail here; the major
feature is that SN brightnesses are extracted from a stack of images
without spatial resampling or convolution of the image data. This
procedure produces accurate photometry along with accurate estimates
of the statistical uncertainty, and can be used to derive photometry
taken with multiple telescopes. We discuss various tests of this
technique that demonstrate its capabilities. We also describe the
methodology used for the calibration of the photometry, and present
calibrated magnitudes and fluxes for all of the spectroscopic SNe Ia
from the 2005 season.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
sources.dat 77 146 SN list
data/* . 146 Individual photometry
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See also:
J/AJ/135/348 : SDSS-II SNe survey: search and follow-up (Sako+, 2008)
J/AJ/135/1766 : Sloan Digital Sky Survey-II supernova survey (Zheng+, 2008)
Byte-by-byte Description of file: sources.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- --- [SDSS-II SN]
12- 16 I5 --- SNID [722/12136] Supernova number
18- 19 I2 h RAh Simbad Hour of Right Ascension (J2000.0)
21- 22 I2 min RAm Simbad Minute of Right Ascension (J2000.0)
24- 27 F4.1 s RAs Simbad Second of Right Ascension (J2000.0)
29 A1 --- DE- Simbad Sign of the Declination (J2000.0)
30- 31 I2 deg DEd Simbad Degree of Declination (J2000.0)
33- 34 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0)
36- 37 I2 arcsec DEs Simbad Arcsecond of Declination (J2000.0)
39- 43 F5.2 mag Bmag ? Simbad B band magnitude
45- 52 A8 --- SpType Simbad MK spectral type
55- 77 A23 --- FileName Name of the file with photometry in
subdirectory "data"
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Byte-by-byte Description of file (#): data/*
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Bytes Format Units Label Explanations
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1- 4 I4 --- Flag Gives values of the photometry flags for each
measurement (1)
6- 17 F12.6 d MJD Modified Julian date of the measurement
20 I1 --- Filt [0/4] Filter in which the measurement was
obtained: [01234] corresponds to [ugriz]
23- 28 F6.3 mag mag asinh magnitude of the supernova for this epoch
and filter in the native SDSS photometric system
31- 36 F6.3 mag e_mag Error on the magnitude
38- 44 F7.3 mag e_sky Estimate of possible systematic error from
uncertainty in sky determination
48- 52 F5.3 mag e_gal Estimate of possible systematic error from
uncertainty in galaxy background determination
54- 63 E10.4 uJy Flux Derived flux, using the SDSS/AB correction
from the paper
66- 74 E9.4 uJy e_Flux Error in the flux
77- 85 E9.4 --- e_SkyF Estimate of possible systematic error from
uncertainty in sky determination in flux units
88- 96 E9.4 --- e_galF Estimate of possible systematic error from
uncertainty in galaxy background determination
in flux units
98-101 A4 --- Tel [sdss] Telescope used for the measurement
105-108 I4 --- Run SDSS run number in which the observation was
obtained
111 I1 --- Strip [0/1] SDSS strip 82N (0) or 82S (1)
115-116 I2 --- NFrame Number of available SDSS frames before 2005,
which constrain the total brightness of the
underlying galaxy
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Note (1): Photometry flag:
* FLAG=0 means there are no liens on the measurement.
* FLAG>1024 means the measurement is likely bad.
* For 0<FLAG<1024, the measurement is likely OK, but there was some
lien on the frames so it was not used to constrain the galaxy
background. See paper for more details.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-May-2011