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When Sri Bhishmaarchya was in lying down on the bed of arrows being in wounded state, waiting for uttarayana kaalam (starts on January 14 or 15) to depart from this world, Lord Sri Krishna knew that Sri Bhishmaarcharya was meditating on HIM and Lord Sri Krishna knew that He was nearing His departure from earth. HE instructs King Sri Yuddhishtra to get full knowledge of all the dharma from Sri Bhishmaarchya. The five brothers of Pandu and Lord Sri Krishna go to the kurushektra war ground where Sri Bhishmarchya is lying down. Knowing this in divine vision, many of the rishis or sages also come and assemble there. Sri Bhishmarachya with smile welcome them and give them seat near Him. As per King Sri Yuddhistra's request Sri Bhishmaarchraya reveals to him knowledge of all the dharma shastras in detail. At the end, King Sri Yuddhistra asks Sri Bhishmaarcharya who is the ultimate god to surrender to. Sri Bhishmaarchaya reveals and shows to HIM that to Lord Krishna who is standing in front him is the lord of the lords to surrender to. He chants Sri Vishnu Sahasrana namam to Lord Sri Krishna and sings this Bhishma Sthuthi to Lord Sri Krishna. Lord Sri Krishna gives full darshan as Lord MahaVishnu with Sudarshana Chakra (Divine wheel) on right hand, Panchajanyam Shanka (Conch) on left hand, padmam (divine lotus) on right hand and gadha (mace) on left hand , wearing yellow silks cloths , wearing vana mala (multi flower garland), with all the ornaments on HIS divine body - most beautiful form and gives Sri Bhishmaacharya poorna mukthi or complete moksham to go Sri Vaikuntam. Sri Bhishmaacharya slowly closes HIS eyes, withdrew HIS senses and leaves the body and goes to Sri Vaikuntam. 
Bhishma Sthuthi . It describes various incidents and leelas of Lord Sri Krishna and how HE is the almighty.