Dear colleagues,

We are pleased to announce new v0 5 HST mosaics for the cluster MACSJ1149 5+2223, from the observations of this target from our Frontier Fields program ID 13504 (PI: J Lotz) The observations for this epoch are now complete at a total of 70 orbits, which we have combined into mosaics on the main cluster field observed with WFC3/IR (F105W, F125W, F140W, F160W) and on the parallel field with ACS (F435W, F606W, F814W) We note that these v0 5 mosaics do not yet include older archival data from CLASH or from other programs; this is to help facilitate study of transient phenomena, for which the data from our program 13504 can be compared with other datasets All other archival data will be combined together with the Frontier Fields data when we release the full-depth v1 0 mosaics The current v0 5 mosaics have all been processed beyond the default pipeline calibration For ACS, these mosaics incorporate CTE correction and bias destriping, while the WFC3/IR mosaics have been masked for persistence, bad pixels, and other detector defects, and also include a set that have been corrected for time-variable background emission in the IR All the 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 link:

• Latest mosaics: http://archive stsci edu/pub/hlsp/frontier/macs1149/images/hst/v0 5-20150109/
• All mosaics: http://archive stsci edu/prepds/frontier/macs1149 html

More general information about the data for the Frontier Fields 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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