Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observations of the Crab Nebula with Early HAWC Data   The High Altitude Water Cherenkov (HAWC) Observatory is a TeV gamma-ray
detector, completed in early 2015. HAWC started science operations in August
2013 with a third of the detector taking data. Several known gamma-ray sources
have already been detected with the first HAWC data. Among these sources, the
Crab Nebula, the brightest steady gamma-ray source at very high energies in our
Galaxy, has been detected with high significance. In this contribution I will
present the results of the observations of the Crab Nebula with HAWC, including
time variability, and the detector performance based on early data.

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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th