In the Gaura-gaṇoddeśa-dīpikā (90), Śrīvāsa Paṇḍita (Śrīvāsa Ṭhākura) is described as an incarnation of Nārada Muni, and Śrī Rāma Paṇḍita, his younger brother, is said to be an incarnation of Parvata Muni, a great friend of Nārada's. Śrīvāsa Paṇḍita's wife, Mālinī, is celebrated as an incarnation of the nurse Ambikā, who fed Lord Kṛṣṇa with her breast milk, and as already noted, his niece Nārāyaṇī, the mother of Ṭhākura Vṛndāvana dāsa, the author of Śrī Caitanya-bhāgavata, was the sister of Ambikā in kṛṣṇa-līlā. We also understand from the description of Śrī Caitanya-bhāgavata that after Lord Caitanya Mahāprabhu's acceptance of the sannyāsa order, Śrīvāsa Paṇḍita left Navadvīpa, possibly because of feelings of separation, and domiciled at Kumārahaṭṭa.
(Sri Caitanya Caritamrta---1:10:8---purport).

Āvirbhāva is a manifestation of the Lord that appears even though He is personally not present. For example, Śrī Śacīmātā offered food at home to Śrī Caitanya Mahāprabhu although He was far away in Jagannātha Purī, and when she opened her eyes after offering the food, she saw that it had actually been eaten by Śrī Caitanya Mahāprabhu. Similarly, when Śrīvāsa Ṭhākura performed saṅkīrtana, everyone felt the presence of Śrī Caitanya Mahāprabhu, even in His absence. This is another example of āvirbhāva.
(Sri Caitanya Caritamrta---1:10:56---purport).

This incident is described as follows by Śrīla Bhaktivinoda Ṭhākura in his Amṛta-pravāha-bhāṣya. One night while Śrī Caitanya Mahāprabhu was dancing with His devotees at the house of Śrīvāsa Ṭhākura, one of Śrīvāsa Ṭhākura's sons, who was suffering from some disease, died. Śrīvāsa Ṭhākura was so patient, however, that he did not allow anyone to express sorrow by crying, for he did not want the kīrtana going on at his house to be disturbed. Thus kīrtana continued without a sound of lamentation. But when the kīrtana was over, Caitanya Mahāprabhu, who could understand the incident, declared, "There must have been some calamity in this house." When He was then informed about the death of ŚrīvāsaṬhākura's son, He expressed His regret, saying, "Why was this news not given to Me before?" He went to the place where the son was lying dead and asked him, "My dear boy, why are you leaving the house of Śrīvāsa Ṭhākura?" The dead son immediately replied, "I was living in this house as long as I was destined to live here. Now that the time is over, I am going elsewhere, according to Your direction. I am Your eternal servant, a dependent living being. I must act only according to Your desire. Beyond Your desire, I cannot do anything. I have no such power." Hearing these words of the dead son, all the members of Śrīvāsa Ṭhākura's family received transcendental knowledge. Thus there was no cause for lamentation. This transcendental knowledge is described in the Bhagavad-gītā (2.13): tathā dehāntara-prāptir dhīras tatra na muhyati. When someone dies, he accepts another body; therefore sober persons do not lament. After the discourse between the dead boy and Śrī Caitanya Mahāprabhu, funeral ceremonies were performed, and Lord Caitanya assured Śrīvāsa Ṭhākura, "You have lost one son, but Nityānanda Prabhu and I are your eternal sons. We shall never be able to give up your company." This is an instance of a transcendental relationship with Kṛṣṇa.
(Sri Caitanya Caritamrta---1:17:229---purport).