Image of the Heartstrong Fire taken by VIIRS band M-13, 19:34 UTC 18 March 2012 Published March 21, 2012 at 1047 × 886 in I- and M- Band Views of the Heartstrong Fire Image of the Heartstrong Fire taken by VIIRS band M-13, 19:34 UTC 18 March 2012 Image of the Heartstrong Fire taken by VIIRS band M-13, 19:34 UTC 18 March 2012. M-13 is the primary band used in active fire detection.