Not after the rising of the second dawn, which is followed by daytime, along with the evidence that the Prophet, peace and blessings be upon him, did not pray the two rak‘ahs of Fajr upon completing Witr; rather, he waited after completing Witr until the second dawn became bright, which is after the brightness of daytime and not nighttime.

Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates that I went to my maternal aunt (Sayyidah Maymunah, may Allah be pleased with her). Then he narrated part of the hadith. Then the Messenger of Allah (peace and blessings of Allah be upon him) went towards the mosque and began to pray there. I also stood on your (peace be upon him) left side. You (peace be upon him) remained for a while, then when you (peace be upon him) were certain that I wanted to pray with you, you (peace be upon him) took hold of me by my forehead and pulled me until you made me stand on your right side. Thus, the Messenger of Allah (peace and blessings of Allah be upon him) performed his night prayer in sets of two rak‘ahs. Then, when the first dawn appeared, the Messenger of Allah (peace and blessings of Allah be upon him) stood and prayed nine rak‘ahs, saying salam after every two rak‘ahs, and prayed one rak‘ah of witr. And this was the ninth rak‘ah. Then the Messenger of Allah (peace and blessings of Allah be upon him) stopped until the dawn became bright. Then you (peace be upon him) stood and performed the two sunnah rak‘ahs of Fajr. Then the Messenger of Allah (peace and blessings of Allah be upon him) lay down on his side. Then Sayyiduna Bilal (may Allah be pleased with him) came. The rest of the hadith was narrated ahead. Imam Abu Bakr (may Allah have mercy on him) says: I have narrated the words of Sayyiduna Ibn Abbas (may Allah be pleased with them both) in Kitab al-Kabir. Imam Abu Bakr (may Allah have mercy on him) says: In this narration of Sayyiduna Ibn Jubayr, there is evidence that the Noble Prophet (peace and blessings of Allah be upon him) performed witr after the first dawn had appeared and before the second dawn appeared. Thus, there are two types of Fajr. The first Fajr appears at night (while a part of the night still remains), and the second Fajr is that after which the day begins. The issue which I dictated in refutation of some scholars who objected to my companions, that it is not permissible to pray one rak‘ah of witr, I have dictated here the narrations regarding three rak‘ahs of witr reported from the Noble Prophet (peace and blessings of Allah be upon him) and their reasons. Imam Abu Bakr (may Allah have mercy on him) says: Regarding the qunoot of witr, I do not remember any hadith proven from the Noble Prophet (peace and blessings of Allah be upon him). In this matter, I have mentioned the reason and chains of transmission of the narration of Sayyiduna Ubayy ibn Ka‘b (may Allah be pleased with him) regarding the qunoot in witr reported from the Noble Prophet (peace and blessings of Allah be upon him). And I have also mentioned here that the mention of qunoot in the hadith of Sayyiduna Ubayy (may Allah be pleased with him) is not authentic. Because even the hadith of Ubayy (may Allah be pleased with him) regarding three rak‘ahs of witr is not established. Whereas the narration of Burayd ibn Abi Maryam, through the means of Abi Hawra, is reported from Sayyiduna Hasan ibn Ali (may Allah be pleased with them both) that the Noble Prophet (peace and blessings of Allah be upon him) taught him a supplication to recite in witr.