Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: VERITAS Observations of 1ES 1218+304 during the 2019 VHE High State   1ES 1218+304 is a moderate-redshift (z = 0.182) high-frequency-peaked BL Lac
object (HBL). Detected by both the MAGIC and VERITAS gamma-ray observatories,
1ES 1218+304 is frequently monitored by VERITAS as part of its long-term blazar
monitoring program. On the 3rd of January 2019, during a regularly scheduled
blazar snapshot, VERITAS observed 1ES 1218+304 to have an elevated VHE flux
state which continued through January 5 (ATEL #12360). In addition to VERITAS
observations, MAGIC also detected elevated VHE emission (ATEL #12354) and
Swift-BAT/XRT and Tuorla observations, in X-ray and optical respectively,
showed increased multiwavelength activity at the time of the VERITAS
observations. In this work, VERITAS observations of 1ES 1218+304 taken as part
of a target of opportunity campaign during this elevated state, are presented.

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The categories of this paper are: eess
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
2
The categories of this paper are: math
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int