Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light Echoes of Historic Transients   Light echoes, light from a variable source scattered off dust, have been
observed for over a century. The recent discovery of light echoes around
centuries-old supernovae in the Milky Way and the Large Magellanic Cloud have
allowed the spectroscopic characterization of these events, even without
contemporaneous photometry and spectroscopy using modern instrumentation. Here
we review the recent scientific advances using light echoes of ancient and
historic transients, and focus on our latest work on SN 1987A's and Eta
Carinae's light echoes.

31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ