Dear colleagues,

We are pleased to announce the third v0 5 release of Epoch 2 HST mosaics obtained on the cluster MACSJ0416 1-2403, from the observations of this target from our Frontier Fields program ID 13496 (P I : J Lotz) This release adds a further 8 orbits, bringing the total Epoch 2 depth to 48 orbits so far In this second epoch, the orientation of HST has enabled the the instruments to be swapped, obtaining WFC3/IR imaging on the parallel field, and ACS/WFC imaging on the primary field These mosaics have all been processed beyond the default pipeline calibration, including self-calibration for ACS and correction for time-variable sky background in WFC3/IR, and are all astrometrically aligned to the previous mosaics obtained of this field 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-current-epoch2/
• 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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