Dear colleagues,

We are pleased to announce the first v0 5 HST mosaics for Epoch 2 of the cluster Abell S1063, consisting of the first 48 orbits of observations from Epoch 2 of our Frontier Fields program (14037, PI : J Lotz), adding 18, 8, 4 and 18 orbits respectively with WFC3/IR F105W, F125W, F140W and F160W on the main cluster, along with 18 and 30 orbits respectively with ACS F435W and F814W on the parallel field, in addition to existing public archival ACS and WFC3/IR imaging obtained in these filters from programs 12458 (PI : M Postman) and 13459 (PI : T Treu) The products released here are the most complete full-depth mosaics in these filters, where all data have been fully reprocessed using the most current calibration files, to produce the best possible quality, science-ready full-depth mosaics For ACS, these mosaics incorporate CTE correction and bias destriping, as well as a set of mosaics that have been processed with the new selfcal approach to better correct for low-level dark current structure The WFC3/IR mosaics have been masked for persistence and bad pixels, and in addition include a set of mosaics that have been corrected for time-variable sky emission that can occur during the orbit and can otherwise impact the up-the-ramp count-rate fitting if not properly corrected All these mosaics are aligned to a common pixel grid as well as to an absolute astrometric frame based on pre-existing catalogs of this field Further details are provided in the readme file, which can be obtained along with all the mosaics at the following location:

• Latest mosaics: http://archive stsci edu/pub/hlsp/frontier/abells1063/images/hst/v0 5-20160505/
• All mosaics: http://archive stsci edu/prepds/frontier/abells1063 html

More general information about the data for this project can be obtained from our Frontier Fields MAST archive website: * http://archive stsci edu/prepds/frontier/ as well as our main Frontier Fields HST project website: * http://www stsci edu/hst/campaigns/frontier-fields/ and our Frontier Fields astronomer's blog and other social media: * https://blogs stsci edu/hstff/ * https://twitter com/MAST_News/ * https://facebook com/MASTArchive/

We hope that these high-level science products are useful for your research, and we welcome any suggestions or questions that you may have about them

Best regards, Anton Koekemoer and the STScI Frontier Fields Team http://archive stsci edu/prepds/frontier/ http://www stsci edu/hst/campaigns/frontier-fields/Contact

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