Narrative:

Nearing the end of an [all-night flight to] den. Flew squarely through window of circadian low (wocl) and was feeling fairly fatigued. I first officer (first officer) was flying a ILS/visual approach to 16R. No reports of windshear from ATIS or approach control. 1;000 feet AGL the aircraft in front of us reported a 15 knot gain and 20 knot loss. CRM'ed possibly going around but elected to continue approach with a 20 knot target add. At 300 feet AGL experienced a wind shear loss far in excess of 20 knots. Initiated go-around. During go-around predictive wind shear system (pws) announced 'windshear; windshear' followed SOP; added max power until verifying we were out of windshear.remainder of go-around and vectors were uneventful. Requested 17R as there was no reported windshear to that runway. At 1;500 feet AGL the aircraft in front of us reported windshear and a loss of 15 knots. We decided that it would be more appropriate for the captain to finish the approach. Transferred aircraft control in compliance with SOP. Elected a 20 knot target once again. At 300 feet AGL we got a windshear gain and flaps blew up to 25. GPWS momentarily announce 'too low; terrain' before immediately quieting as we got another immediate 15-20 kt loss and the flaps moved back to 30. This happened very quickly before go-around could even be considered/announced. The approach immediately re-stabilized and the captain accomplished a safe landing; on speed; in the touch down zone.

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Original NASA ASRS Text

Title: B737NG First Officer reported encountering windshear on two separate approaches into DEN; executing a go-around after the first encounter; but landing after the second; even though they received a terrain alert.

Narrative: Nearing the end of an [all-night flight to] DEN. Flew squarely through Window of Circadian Low (WOCL) and was feeling fairly fatigued. I First Officer (FO) was flying a ILS/visual approach to 16R. No reports of windshear from ATIS or Approach Control. 1;000 feet AGL the aircraft in front of us reported a 15 knot gain and 20 knot loss. CRM'ed possibly going around but elected to continue approach with a 20 knot target add. At 300 feet AGL experienced a wind shear loss far in excess of 20 knots. Initiated go-around. During go-around Predictive Wind shear System (PWS) announced 'Windshear; Windshear' Followed SOP; added max power until verifying we were out of windshear.Remainder of go-around and vectors were uneventful. Requested 17R as there was no reported windshear to that runway. At 1;500 feet AGL the aircraft in front of us reported windshear and a loss of 15 knots. We decided that it would be more appropriate for the Captain to finish the approach. Transferred aircraft control in compliance with SOP. Elected a 20 knot target once again. At 300 feet AGL we got a windshear gain and Flaps blew up to 25. GPWS momentarily announce 'Too Low; Terrain' before immediately quieting as we got another immediate 15-20 kt loss and the flaps moved back to 30. This happened very quickly before go-around could even be considered/announced. The approach immediately re-stabilized and the Captain accomplished a safe landing; on speed; in the touch down zone.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.