SGR 1935+2154
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 19h 34m 55.68s |
| Declination | 21° 53′ 48.2″ |
| Astrometry | |
| Distance | 21,500–28,400 ly (6,600–8,800 pc) |
| Details | |
| Radius | 4.35+1.95 −1.35 km |
| Database references | |
| SIMBAD | data |
| Other designations | |
SGR 1935+2154 (or SGR J1935+2154) is a soft gamma repeater (SGR) and ancient stellar remnant, in the constellation Vulpecula, originally discovered in 2014 by the Neil Gehrels Swift Observatory. Currently, the SGR-phenomena and the related anomalous X-ray pulsars (AXP) are explained as arising from magnetars. On 28 April 2020, this remnant about 30,000 light-years away in our Milky Way galaxy was observed to be associated with a very powerful radio pulse known as a fast radio burst or FRB (designated FRB 200428), and a related X-ray flare. The detection is notable as the first FRB detected inside the Milky Way, and the first to be linked to a known source. Later in 2020, SGR 1935+2154 was found to be associated with repeating fast radio bursts.