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Magneto-optical trap (MOT) at narrow (weak) transition offers lowertemperature and hence is the key for production of high phase density atomiccloud and subsequently quantum degeneracy with high number of atoms for manyelements. In this paper, we describe loading of $^{87}$Rb atoms in the MOTusing a narrow open transition at 420 nm from the routinely implemented MOTusing broad cyclic transition at 780 nm (IR). The total linewidth of the bluetransition, 5S$_{1/2} \rightarrow $ 6P$_{3/2}$ is 1.4 MHz, which is around 4times narrower than the standard 5S$_{1/2} \rightarrow$ 5P$_{3/2}$ cyclictransition. Using this narrow transition, we have trapped around $10^{8}$ atomsin the MOT with a typical temperature of around $54~\mu$K. We have also studiedthe behavior of the blue MOT with various parameters such as hold time,detuning and power of trapping and repumper beams.

Narrow-line cooling of $^{87}$Rb using 5S$_{1/2} \rightarrow$ 6P$_{3/2}$ open transition at 420 nm