Photpipe blurb for publications
We processed the data using an implementation of the photpipe pipeline modified for DECam images. Photpipe is a robust pipeline used by several time-domain surveys (e.g., SuperMACHO, ESSENCE, Pan-STARRS1; see Rest et al. 2005; Rest et al. 2014), designed to perform single-epoch image processing including image calibration (e.g., bias subtraction, cross-talk corrections, flat-fielding), astrometric calibration, warping and image coaddition (SWarp, Bertin et al. 2002), and photometric calibration. Additionally, photpipe performs difference imaging using hotpants (Alard 2000; Becker 2015) to compute a spatially varying convolution kernel, followed by photometry on the difference images using an implementation of DoPhot (Schechter et al. 1993) optimized for point spread function (PSF) photometry on difference images (Rest et al. 2005). We use photpipe to perform initial candidate searches by specifying a required number of spatially coincident detections over a range of time. Once candidates are identified photpipe performs “forced” PSF photometry on the subtracted images at the fixed coordinates of an identified candidate in each available epoch.:
@ARTICLE{2005ApJ...634.1103R,
author = {{Rest}, A. and {Stubbs}, C. and {Becker}, A.~C. and {Miknaitis}, G.~A. and
{Miceli}, A. and {Covarrubias}, R. and {Hawley}, S.~L. and {Smith}, R.~C. and
{Suntzeff}, N.~B. and {Olsen}, K. and {Prieto}, J.~L. and {Hiriart}, R. and
{Welch}, D.~L. and {Cook}, K.~H. and {Nikolaev}, S. and {Huber}, M. and
{Prochtor}, G. and {Clocchiatti}, A. and {Minniti}, D. and {Garg}, A. and
{Challis}, P. and {Keller}, S.~C. and {Schmidt}, B.~P.},
title = "{Testing LMC Microlensing Scenarios: The Discrimination Power of the SuperMACHO Microlensing Survey}",
journal = {\apj},
eprint = {astro-ph/0509240},
keywords = {Cosmology: Dark Matter, Galaxies: Halos, Galaxies: Structure, Galaxy: Structure, Cosmology: Gravitational Lensing, Galaxies: Magellanic Clouds},
year = 2005,
month = dec,
volume = 634,
pages = {1103-1115},
doi = {10.1086/497060},
adsurl = {http://adsabs.harvard.edu/abs/2005ApJ...634.1103R},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@ARTICLE{2014ApJ...795...44R,
author = {{Rest}, A. and {Scolnic}, D. and {Foley}, R.~J. and {Huber}, M.~E. and
{Chornock}, R. and {Narayan}, G. and {Tonry}, J.~L. and {Berger}, E. and
{Soderberg}, A.~M. and {Stubbs}, C.~W. and {Riess}, A. and {Kirshner}, R.~P. and
{Smartt}, S.~J. and {Schlafly}, E. and {Rodney}, S. and {Botticella}, M.~T. and
{Brout}, D. and {Challis}, P. and {Czekala}, I. and {Drout}, M. and
{Hudson}, M.~J. and {Kotak}, R. and {Leibler}, C. and {Lunnan}, R. and
{Marion}, G.~H. and {McCrum}, M. and {Milisavljevic}, D. and
{Pastorello}, A. and {Sanders}, N.~E. and {Smith}, K. and {Stafford}, E. and
{Thilker}, D. and {Valenti}, S. and {Wood-Vasey}, W.~M. and
{Zheng}, Z. and {Burgett}, W.~S. and {Chambers}, K.~C. and {Denneau}, L. and
{Draper}, P.~W. and {Flewelling}, H. and {Hodapp}, K.~W. and
{Kaiser}, N. and {Kudritzki}, R.-P. and {Magnier}, E.~A. and
{Metcalfe}, N. and {Price}, P.~A. and {Sweeney}, W. and {Wainscoat}, R. and
{Waters}, C.},
title = "{Cosmological Constraints from Measurements of Type Ia Supernovae Discovered during the First 1.5 yr of the Pan-STARRS1 Survey}",
journal = {\apj},
archivePrefix = "arXiv",
eprint = {1310.3828},
keywords = {cosmological parameters, cosmology: observations, dark energy, supernovae: general},
year = 2014,
month = nov,
volume = 795,
eid = {44},
pages = {44},
doi = {10.1088/0004-637X/795/1/44},
adsurl = {http://adsabs.harvard.edu/abs/2014ApJ...795...44R},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
INPROCEEDINGS{Bertin02,
author = {{Bertin}, E. and {Mellier}, Y. and {Radovich}, M. and {Missonnier}, G. and
{Didelon}, P. and {Morin}, B.},
title = "{The TERAPIX Pipeline}",
keywords = {astronomy: optical, astronomy: software, pipelines: data reduction, software: package, software: development, software: data analysis, data analysis, databases, distributed processing},
booktitle = {Astronomical Data Analysis Software and Systems XI},
year = 2002,
series = {Astronomical Society of the Pacific Conference Series},
volume = 281,
editor = {{Bohlender}, D.~A. and {Durand}, D. and {Handley}, T.~H.},
pages = {228},
adsurl = {http://adsabs.harvard.edu/abs/2002ASPC..281..228B},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@ARTICLE{2000A&AS..144..363A,
author = {{Alard}, C.},
title = "{Image subtraction using a space-varying kernel}",
journal = {\aaps},
keywords = {METHODS: NUMERICAL, METHODS: STATISTICAL, STARS: VARIABLES: GENERAL, COSMOLOGY: GRAVITATIONAL LENSING},
year = 2000,
month = jun,
volume = 144,
pages = {363-370},
doi = {10.1051/aas:2000214},
adsurl = {http://adsabs.harvard.edu/abs/2000A%26AS..144..363A},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@MISC{2015ascl.soft04004B,
author = {{Becker}, A.},
title = "{HOTPANTS: High Order Transform of PSF ANd Template Subtraction}",
keywords = {Software},
howpublished = {Astrophysics Source Code Library},
year = 2015,
month = apr,
archivePrefix = "ascl",
eprint = {1504.004},
adsurl = {http://adsabs.harvard.edu/abs/2015ascl.soft04004B},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
ARTICLE{1993PASP..105.1342S,
author = {{Schechter}, P.~L. and {Mateo}, M. and {Saha}, A.},
title = "{DOPHOT, a CCD photometry program: Description and tests}",
journal = {\pasp},
keywords = {Astronomical Photometry, Charge Coupled Devices, Computer Programs, Computerized Simulation, Data Reduction, Image Processing, Point Spread Functions, Comparison, Globular Clusters, Stellar Color, Stellar Magnitude},
year = 1993,
month = nov,
volume = 105,
pages = {1342-1353},
doi = {10.1086/133316},
adsurl = {http://adsabs.harvard.edu/abs/1993PASP..105.1342S},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}