Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Second Bright Source Detected Near SN1987A   Speckle interferometry observations, made just 30 and 38 days after the
explosion of supernova SN1987A (SN) (which was first seen on February 23,
1987), showed evidence for a bright source, separated from the SN by only 60
mas. Reprocessing of that data using new image reconstruction algorithms has
resulted in much cleaner images which not only clearly show the bright spot
reported in 1987, but also a 2nd spot on the opposite side of the SN with a
larger spatial separation. If the spots were ejected from the SN then the
velocities of the spots are relativistic and the 2nd spot appears to be
superluminal and must be blue-shifted. We explore the consequences of these
results on the geometry of the SN1987A system, and we conclude that our
observations may well be evidence for a relativistic jet emanating from the
supernova.

9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th