The following maps contain HAWC data from 1 transit of each source.
There are two main sources of live time losses. First, each run restart introduces a
~5min gap in data-taking. Second, periods of 15min are excluded from analysis if an
instability in the zenith distribution is detected. Usually the detector is stable
and these cause only a few percent loss in live time but if this happens multiple
times during the transit the integrated live time for that transit can decrease
dramatically.
The plot to the right shows the total integrated live time as a fraction of
the source transit in some recent maps. Each point represents the total live
time from the 1 transit period ending at the x-axis date. We expect real
sources to be less significant for smaller live times.
An integrated live time of 0 means HAWC was off during the source transit.
This could be due to work on the detector, especially if the transit is
in the morning when people are first getting to the site. Contact the
#hawc-site channel in Slack to figure out what's up.
These maps are made with a 9 bin LIFF analysis.
The analysis does not include bin 0 because we have never
seen a Crab signal in bin 0. The rest of the bins are identical
to bins 1-9 in offline maps produced by Colas for the Saucy Platypus/Pass 4
reconstruction. There is no separation of ON/OFF detector events.
We use the same detector response file as defined offline for Pass 4.
Click here to learn more about online map production.
Click here to visit the archive of all past map images.
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