Dear colleagues,

We are pleased to announce the first v0 5 release of Epoch 2 mosaics obtained for the cluster MACSJ0416 1-2403, from our Frontier Fields program ID 13496 (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 In this first week of Epoch 2, a total of 16 orbits have been obtained, consisting of 4 orbits each in F105W, F125W, F140W and F160W with WFC3/IR on the main cluster field, along with 4 orbits of F435W and 12 orbits of F814W with ACS on the parallel field These mosaics have all been processed beyond the default pipeline calibration, including correction for time-variable sky and persistence effects in WFC3/IR, 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 locations:

• Latest mosaics: http://archive stsci edu/pub/hlsp/frontier/macs0416/images/hst/v0 5-20140809/
• All mosaics: http://archive stsci edu/prepds/frontier/macs0416 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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