It was 7 June 1918. Chandra used to observe stars most of the nights at that time. He suddenly noticed a bright star. He tried to match it with the Star Map but did not find any. He observed it for the next few days and came to decision that it is a new one. In the language of astronomy it was a Nova. He published the detail description of this Nova in the Probashi magazine of that time. Later this nova was named as Nova Aquila-3'. http://en.wikipedia.org/wiki/Radha_Gobinda_Chandra#Discovery_of_Nova
V603 Aquilae (or Nova Aquilae 1918) was a bright nova occurring in the constellation Aquila in 1918. It is a binary system composing of a white dwarf and donor low mass star in close orbit to the point of being only semidetached. Discovered on the night of 8 June 1918, Nova Aquilae reached a peak magnitude of 0.5; it was the brightest nova recorded in the era of the telescope http://en.wikipedia.org/wiki/V603_Aquilae
V603 Aquilae (or Nova Aquilae 1918) was a bright nova occurring in Aquila in 1918. It reached a peak magnitude of -1.4; it was the brightest nova of the twentieth century and possibly the brightest ever recorded. Read more
V603 Aquilae was the brightest nova recorded in the last 300 years. The first sighting was made on the night of June 8, 1918, and was viewed as an object of the first magnitude about 6° north of the star cloud in the Milky Way of Scutum Among the first to observe it there was E. Barnard. At the time of discovery, the nova was brighter than Altair, but within a few hours had become the brightest star in the northern hemisphere.