Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ASAS-SN search for optical counterparts of gravitational-wave events
  from the third observing run of Advanced LIGO/Virgo   We report on the search for electromagnetic counterparts to the nine
gravitational-wave events with a $>$60\% probability of containing a neutron
star during the third (O3) LIGO-Virgo Collaboration (LVC) observing run with
the All-Sky Automated Survey for SuperNovae (ASAS-SN). No optical counterparts
associated with a gravitational wave event was found. However, thanks to its
network of telescopes, the average area visible to at least one ASAS-SN site
during the first 10 hours after the trigger contained $\sim$30\% of the
integrated source location probability. Through a combination of normal
operations and target-of-opportunity observations, ASAS-SN observations of the
highest probability fields began within one hour of the trigger for four of the
events. After 24 hours, ASAS-SN observed $>$60\% of total probability for three
events and $>$40\% for all but one of the events. This is the largest area
coverage to a depth of $g = 18.5$ mag from any survey with published coverage
statistics for seven of the nine events. With its observing strategy, five
sites around the world, and a large field of view, ASAS-SN will be one of the
leading surveys to optically search for nearby neutron star mergers during LVC
O4.

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The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys