Night report 2017-08-22

Observers: David Homan, Joe Lyman

TAT: Morgan Fraser, Giorgos Leloudas

Support team: Morgan Fraser

Calibrations: biases, dome arcs

Conditions: Closed at start of night, heavy cloud cover. Quite high winds, ~10m/s. Passing clouds for the short duration dome was opened. Close for 2nd half of night due to thick clouds.

UT Target Type Comment

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02:30 Dome opened under still poor conditions, switch to SOFI.

02:35 AT2017gah followup JHK - very marginal detection in J exposures only.

02:45 AT2017gah followup Started BG OB - no guide star and conditions very poor. Didn't start spectrum, instead repeated JHK for AT2017gah with extended OBs - clouds hit and nothing in exposures.

03:20 AT2017gah followup JHK again. Conditions improved a bit, good detection in individual J frames, seems to be there in HK

03:50 AT2016iks followup JHK. K band in particular was affected by incoming clouds

05:15 Nothing visible on all-sky cam. Wait out clouds.

05:40 Dome closed.

09:30 Dome opened.

09:35 AT2017gax followup JHK. JH detections in frames by eye, just about there in K

10:00 AT2017fzw followup JHK. J detections in frames by eye, just about there in HK