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May 19, 2022
Dear friends,

In my previous newsletter, I described a forthcoming collaboration with citizen scientists to identify the most promising candidate signals in our data and build a labeled training set for a new machine learning application.  This initiative is enabled in part by a grant from The Planetary Society (TPS).  I also submitted a grant proposal to the NASA Citizen Science Seed Funding Program, which funds projects for a maximum duration of one year.  This proposal received good reviews and was also selected for funding.  I am thrilled that the combination of NASA and TPS funding will allow us to support the citizen science platform for an extended duration. 

The seventh edition of the UCLA SETI course is in full swing.  As usual, we have a combination of undergraduate and graduate students, but this year we have an unusually high concentration of astrophysics majors.  Some of the astrophysics students are taking the SETI course to fulfill a degree requirement.  We are now in week 8 of the 10-week quarter, and students are hard at work on their final projects.  All 23 students in the class are tasked with (a) identifying a promising candidate technosignature among millions of signals detected by our data-processing pipeline, (b) identifying a previously unrecognized class of pervasive radio frequency interference (RFI), and (c) contributing software improvements to our pipeline, website, or citizen science platform.  The software contributions are managed by a dozen small teams and shared on the GitHub platform. 
The GitHub web interface
For the first time in the history of the UCLA SETI course, the scheduling of our Green Bank Telescope (GBT) observations is handled by a dynamic scheduler.  This decision was beyond our control and has not worked out well.  The students are still awaiting their chance to observe with the GBT, whereas by now they would otherwise be deeply immersed in the analysis of their observations.  There is a real risk that the students will not get to participate in remote observations this year, which is normally a highlight of the course. 

A few weeks ago, I had the privilege of having an extended walk and chat with Dan Werthimer, who happened to be in Santa Monica at the time.  Dan is the co-recipient of the 2021 Drake Award (see May 2, 2021 newsletter) and it was a pleasure to talk to him about all things SETI.  One topic of conversation focused on the process by which radio SETI processing pipelines compute the total power associated with each signal.  Signals of interest drift linearly in time-frequency space, a phenomenon referred to as a "chirp" because an equivalent audio waveform would sound like a bird's chirp.  The power calculation involves dechirping, i.e., removing the frequency drift of the signal.  Dechirping can be done in a computationally costly phase-preserving fashion ("coherent") or in a computationally efficient phase-destroying fashion ("incoherent").  One of our recent papers quantified the efficiency of incoherent dechirping (see November 16, 2020 newsletter for an illustration) and Dan described a great idea for improving the efficiency in the Breakthrough Listen pipeline.
 
This year's recipient of the Drake Award is Professor Shelley Wright, who is a trailblazer in optical SETI searches.  I look forward to reading about her discoveries of astronomical transients and perhaps laser emissions from another civilization.


Warm regards,

Jean-Luc Margot
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