Dear colleagues,

We are pleased to announce the release of the first new v0 5 HST mosaics obtained on the cluster MACSJ1149 5+2223, from the observations of this target from our Frontier Fields program ID 13504 (PI: J Lotz) in November 2014 We note that these v0 5 mosaics on the main cluster field do not yet include older archival data from CLASH or other programs; this is to help facilitate study of transient phenomena, for which these November 2014 data can be compared with earlier mosaics (such as CLASH, which we also make available from the Frontier Fields webpage for this cluster) All earlier archival data will be combined together with the Frontier Fields data when we release the full-depth v1 0 mosaics, after this epoch is completed The current v0 5 mosaics have all been processed beyond the default pipeline calibration, in order to produce the best possible quality, science-ready full-depth mosaics 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 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 link:

• Latest mosaics: http://archive stsci edu/pub/hlsp/frontier/macs1149/images/hst/v0 5-20141128/
• 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

This message is being sent to those who have expressed interest in receiving email updates about the Frontier Fields program To unsubscribe from this email list, please send an email to "majordomo@stsci edu" with the following text in the message: unsubscribe frontierfields-announcements@stsci edu [email-address]