This image was taken on 2017 February, with the GSO telescope and the ATIK-One CCD. It is the result of a LRGB sequence of (22+5+5+5)x300s, for a total of about 3hr of total exposition with only 75 min of colours. This explain why the imagine looks more BW than LRGB.
Messier 3 (M3 or NGC 5272) is a globular cluster of stars in the northern constellation of Canes Venatici. It was discovered on May 3, 1764 and was the first Messier object to be discovered by Charles Messier himself. Messier originally mistook the object for a nebula without stars. This mistake was corrected after the stars were resolved by William Herschel around 1784. Since then, it has become one of the best-studied globular clusters. Identification of the cluster’s unusually large variable star population was begun in 1913 by American astronomer Solon Irving Bailey and new variable members continue to be identified up through 2004. (Wikipedia)