GREATS Data Release NOTES
=========================

These files constitute the public release of the GOODS Re-ionization Era wide-Area Treasury from Spitzer (GREATS; PI: I. Labbé) full-depth IRAC 3.6um-to-8.0um mosaics over the GOODS-N and GOODS-S fields. This data release consists of the science images, exposure time maps, point-spread function (PSF) maps, and a python script to reconstruct the PSF at specific locations across the mosaics. We also include flux density measurements for 9192 Lyman-break galaxies at z~3.5-10 selected by Bouwens et al. (2015).

An overview of GREATS is presented at the following website:

https://home.strw.leidenuniv.nl/~stefanon/GREATS/

The above web link will be maintained up-to-date through the "Comment" field of the arXiv posting.

Full details on how the mosaics and PSF maps were constructed, and on how the photometry was extracted, are given in Stefanon et al. (2021b). Please cite Stefanon et al. (2021b) if you make use of these data in your publications.

Science frames have been calibrated to MJy/sr (AB zeropoint=23.086 mag), while exposure time maps have units of seconds. The mosaics have the same tangential plane of CANDELS/GOODS mosaics, with a 0.3"/pixel scale. Flux densities reported in the catalogs are in units of nJy. 

Besides this README file, the zip archive contains the following files:

GREATS_GOODS-N_CH1_v1.2_exp.fits -> Exposure time map for the GOODS-N mosaic in the 3.6um band
GREATS_GOODS-N_CH1_v1.2_psf.fits -> PSF map for the GOODS-N mosaic in the 3.6um band
GREATS_GOODS-N_CH1_v1.2_sci.fits -> Science frame for the GOODS-N mosaic in the 3.6um band
GREATS_GOODS-N_CH2_v1.2_exp.fits -> Exposure time map for the GOODS-N mosaic in the 4.5um band
GREATS_GOODS-N_CH2_v1.2_psf.fits -> PSF map for the GOODS-N mosaic in the 4.5um band
GREATS_GOODS-N_CH2_v1.2_sci.fits -> Science frame for the GOODS-N mosaic in the 4.5um band
GREATS_GOODS-N_CH3_v1.2_exp.fits -> Exposure time map for the GOODS-N mosaic in the 5.8um band
GREATS_GOODS-N_CH3_v1.2_psf.fits -> PSF map for the GOODS-N mosaic in the 5.8um band
GREATS_GOODS-N_CH3_v1.2_sci.fits -> Science frame for the GOODS-N mosaic in the 5.8um band
GREATS_GOODS-N_CH4_v1.2_exp.fits -> Exposure time map for the GOODS-N mosaic in the 8.0um band
GREATS_GOODS-N_CH4_v1.2_psf.fits -> PSF map for the GOODS-N mosaic in the 8.0um band
GREATS_GOODS-N_CH4_v1.2_sci.fits -> Science frame for the GOODS-N mosaic in the 8.0um band
GREATS_GOODS-S_CH1_v1.2_exp.fits -> Exposure time map for the GOODS-S mosaic in the 3.6um band
GREATS_GOODS-S_CH1_v1.2_psf.fits -> PSF map for the GOODS-S mosaic in the 3.6um band
GREATS_GOODS-S_CH1_v1.2_sci.fits -> Science frame for the GOODS-S mosaic in the 3.6um band
GREATS_GOODS-S_CH2_v1.2_exp.fits -> Exposure time map for the GOODS-S mosaic in the 4.5um band
GREATS_GOODS-S_CH2_v1.2_psf.fits -> PSF map for the GOODS-S mosaic in the 4.5um band
GREATS_GOODS-S_CH2_v1.2_sci.fits -> Science frame for the GOODS-S mosaic in the 4.5um band
GREATS_GOODS-S_CH3_v1.2_exp.fits -> Exposure time map for the GOODS-S mosaic in the 5.8um band
GREATS_GOODS-S_CH3_v1.2_psf.fits -> PSF map for the GOODS-S mosaic in the 5.8um band
GREATS_GOODS-S_CH3_v1.2_sci.fits -> Science frame for the GOODS-S mosaic in the 5.8um band
GREATS_GOODS-S_CH4_v1.2_exp.fits -> Exposure time map for the GOODS-S mosaic in the 8.0um band
GREATS_GOODS-S_CH4_v1.2_psf.fits -> PSF map for the GOODS-S mosaic in the 8.0um band
GREATS_GOODS-S_CH4_v1.2_sci.fits -> Science frame for the GOODS-S mosaic in the 8.0um band

getpsf.py -> Python script illustrating how to read the _psf.fits file and reconstruct the PSF at a specific location
getpsf.pro -> Same as above, but in IDL


The GREATS Team  is composed by Ivo Labbé (PI), Mauro Stefanon, Pascal Oesch, Stephane de Barros, Valentino Gonzalez, Rychard Bouwens, Marijn Franx, Garth Illingworth, Brad Holden, Dan Magee, Renske Smit and Pieter van Dokkum.