Dear colleagues,

We are pleased to announce the first new v0 5 HST mosaics for Epoch 2 of the cluster MACSJ0717 5+3745, from the observations of this target from our Frontier Fields program ID 13498 (PI: J Lotz) In this second epoch, the orientation of HST enables the instruments to be swapped, in order to obtain WFC3/IR imaging on the main cluster field and ACS imaging on the parallel field, with a total of 28 orbits so far that have been obtained from this program during this epoch We have combined these data with archival data from programs 12103 (PI: M Postman), 13389 (PI: B Siana), and 13459 (PI : T Treu), to create mosaics that are intended to contain the full depth of WFC3/IR data on the main cluster and ACS data on the parallel field These mosaics have all been processed beyond the default pipeline calibration, including correction for time-variable background and persistence effects in WFC3/IR, as well as self-calibration processing for ACS, and astrometric alignment to the previous mosaics that have already been constructed for this cluster 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/macs0717/images/hst/v0 5-20150321/
• All mosaics: http://archive stsci edu/prepds/frontier/macs0717 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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