########################
###    COSMOS-Web    ###
###   MIRI mosaics   ###
### Data Release 0.2 ###
########################

Release Date: 15 Aug 2023

We provide the MIRI data reductions for the first epoch of COSMOS-Web 
(GO #1727;  PIs: Kartaltepe & Casey; see Casey & Kartaltepe et al. 2023), 
consisting of six visits (out of  the total 152) corresponding to visits #43-48.
These observations  were obtained between 5-6 January 2023.

Instrument: MIRI
Filters: F770W
CRDS Context pmap: 1017
Calibration Pipeline Used: v1.8.4

================================
## Directory/File information ##
================================

This directory contains version 0.2 of the MIRI mosaic data reduction.
The raw images were processed using the JWST Calibration Pipeline v1.8.4 (Bushouse et al. 2022),
which was enhanced with customized modifications and reduction techniques.

Each mosaic is present in two different resolutions: 60mas and 90mas. 
Astrometry is anchored to Gaia-EDR3 and bootstrapped from the HST/F814W 
imaging (Koekemoer et al. 2007) and COSMOS2020 catalogs (Weaver et al. 2022).

The image filenames are: mosaic_miri_f770w_COSMOS-Web_XXmas_v0_2_i2d.fits, 
where XX is the resolution in mas (60 or 90).

The structure of *i2d.fits is as following:
HDU EXTNAME     HDU Type    DataType  Dimensions
0   N/A         primary     N/A       N/A
1   sci         IMAGE       float32   ncols x nrows
2   ERR         IMAGE       float32   ncols x nrows
3   CON         IMAGE       int32     ncols x nrows x nplanes
4   WHT         IMAGE       float32   ncols x nrows
5   VAR_POISSON IMAGE       float32   ncols x nrows
6   VAR_RNOISE  IMAGE       float32   ncols x nrows
7   VAR_FLAT    IMAGE       float32   ncols x nrows

The definition of each of this extension is available here:
jwst-pipeline.readthedocs.io/en/latest/jwst/data_products/science_products.html

To facilitate the handling of these data the SCI, ERR, WHT extensions have 
been extracted and placed in the following sub-folder: extensions

==================
## Image depths ##
==================

The 5σ depths in apertures of 0.3’’ radius (without any corrections) are:

# Integrations  F770W 
# 2 (12%)       25.33 	
# 4 (62%)       25.70	
# 6 (5%)        25.76	
# 8 (21%)       25.98	

==========================
## Astrometric accuracy ##
==========================

(COSMOS2020 - JWST/F770W)

F770W
RA                 DEC
med:  -06.26 mas    med:  -14.61 mas
mean: -05.16 mas    mean: -08.77 mas
MAD:   34.38 mas    MAD:   32.67 mas

#################

This work was made possible by utilizing the CANDIDE cluster at the Institut 
d’Astrophysique de Paris, which was funded through grants from the PNCG, CNES, 
DIM-ACAV, and the Cosmic Dawn Center and maintained by S. Rouberol.

The pipeline used for the data reduction incorporated codes from Micaela Bagley, Anton M. Koekemoer, and Daizhong Liu.

For any question or to report a problem, please send a message to: 
santosh.harish@rit.edu


================
## References ##
================

Bushouse, H. et al. 2022, https://ui.adsabs.harvard.edu/abs/2022zndo...7429939B
Casey, C. M., Kartaltepe, J. S. et al. 2023, ApJ, in press, https://ui.adsabs.harvard.edu/abs/2022arXiv221107865C
Koekemoer, A. M. et al. 2007, ApJS, 172, 196, https://ui.adsabs.harvard.edu/abs/2007ApJS..172..196K
Weaver, J. R. et al. 2022, ApJS, 258, 11,  https://ui.adsabs.harvard.edu/abs/2022ApJS..258...11W