(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. (ES)
Reference (ES): Sunan an-Nasa'i 1773 (ES)
In-book reference (ES): Book 20, Hadith 176 (ES)
English translation (ES): Vol. 2, Book 20, Hadith 1774 (ES)