stellar cluster in interaction with the Luminous Blue Variable (LBV) source G79.29+0.46 [@Rizzo:2008aa; @Jimenez:2010aa]. Distance to G79.29+0.46 has been also estimated to be 1.4 kpc [@Rizzo:2014aa; @Palau:2014aa].

Our main goal in this study is to track the progression of the star formation in the DR15 cluster and its immediate surroundings, by looking at the properties and distributions of the young stellar population. DR15 is especially interesting for being at a very specific stage at which it is already emerging from its parental cloud (some members and parts of the reflection nebulosities are already detectable in visible wavelengths). Moreover, the interesting case it presents at being apparently formed at the tip of a filamentary structure and next to a much younger star forming spot in the IRDC, is worth of detailed attention.

The paper is organized as follows: in Section \[obs\] we describe the datasets used in this work. Section \[analysis\] is dedicated to describe the procedures we followed to acomplish a description of the history of star formation in the region, a result which we discuss in Section \[discussion\]. Finally, a brief summary of our results can be found in Section \[discussion\].

Observations {#obs}
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For the first part of 