After a successful third SPTpol cryostat cooldown, and a run on our Fourier Transform Spectrometer (FTS) to measure the SPTpol detector frequency response, we hoisted the SPTpol camera into the telescope cabin on January 25 at ~9 am, effectively mating the SPTpol camera to the telescope.  On January 26th at 11 pm (New Zealand time) we achieved first light with the SPTpol camera, observing RCW38, a nearby dusty star cluster and one of the brightest mm-wavelength objects in the sky.  Below are screenshots of a handful of detector responses as we scanned the telescope over RCW38, which is the large negative peak in the detector timestream.  First light observations like this are a big deal for a new instrument, so needless to say we are very thrilled!  This also means my days here are numbered, though more on that later. 

Three 90 GHz detectors, the large negative spikes in the top two time-streams are repeated scans over RCW38!

Same as above, but for six 150 GHz detectors!