Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: BVRI Photometry of SN 2011fe in M101   We present BVRI photometry of supernova 2011fe in M101 from 2.9 to 182 days
after the explosion. The light curves and color evolution show that SN 2011fe
belongs to the "normal" subset of type Ia supernovae, with $\Delta m_{15}(B) =
1.21 \pm 0.03$ mag. After correcting for extinction and adopting a distance
modulus of $(m - M) = 29.10$ mag to M101, we derive absolute magnitudes $M_B =
-19.21$, $M_V = -19.19$, $M_R = -19.18$ and $M_I = -18.94$. We compare visual
measurements of this event to our CCD photometry and find evidence for a
systematic difference based on color.

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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org