Update: The LRO LAMP instrument (UV spectrometer) has confirmed detection of the ejecta plume and has begun analyzing their data. Also, the LRO Diviner instrument (Imaging Radiometer) has confirmed they have detected the #LCROSS impact crater.
First data from LCROSS impacts are coming in. Athony Colaprete, LCROSS Principal Investigator (NASA Ames), confirmed during NASA/LCROSS press conference that
We saw the impact, we saw the crater, we got spectroscopic data, which is the data we need.
Jennifer Heldmann, LCROSS Observation Campaign Lead (NASA Ames), said that there is observation data from over 20 land sites as well as the Hubble Space Telescope (HST) and the Lunar Reconnaissance Orbiter (LRO) and other observatories in Earth’s orbit.
The public was somewhat disappointed by not seeing the ejecta plume. Although the scientists have confirmed the impact and seen a crater, there are several explanations for the lack of plumes. One could be simply that the ejecta did not “fly” high enough above the surface to escape the shadows of lunar surface. Alternatively, the ejected material could have been too faint and too spread out to be observable from almost 400,000 km. Nevertheless, Colaprete emphasized that scientific instruments were primarily focused on collecting spectra and that the first look at the data shows signs of ejected material.