(60) باب وَقْتِ رَكْعَتَىِ الْفَجْرِ وَذِكْرِ الاِخْتِلاَفِ عَلَى نَافِعٍ
It was narrated from 'Abdullah bin Umar that Hafsah, the Mother of the Believers, told him:
that when the Muaddhin fell silent following the call to Subh prayer and dawn had broken, he would pray two brief rak'ahs before getting up to pray. (FR)
Reference (FR): Sunan an-Nasa'i 1773 (FR)
In-book reference (FR): Book 20, Hadith 176 (FR)
English translation (FR): Vol. 2, Book 20, Hadith 1774 (FR)