What astronomical object emerges sometimes from supernova instead of a black hole?

Magnetar
Blazar
Quasar
only a black hole can emerge from supernova
A magnetar is a type of neutron star with an extremely powerful magnetic field. The magnetic field decay powers the emission of high-energy electromagnetic radiation, particularly X-rays and gamma rays. As of March 2016, only 23 magnetars are known, with six more candidates awaiting confirmation.
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Answers by country

Magnetar
Blazar
Quasar
only a black hole can emerge from supernova
answers
flagPakistan
52%
5%
17%
23%
17
flagSwitzerland
50%
8%
8%
33%
12
flagthe United States
47%
4%
33%
15%
72
flagAustria
43%
6%
25%
18%
32
flagGermany
38%
15%
23%
21%
218
flagAustralia
38%
4%
38%
14%
21
flagIndia
36%
10%
36%
14%
174
flagthe United Kingdom
36%
9%
41%
12%
41
flagPoland
28%
11%
40%
18%
3199
flagLebanon
21%
14%
64%
0%
14
flagGreece
15%
15%
38%
30%
13