| Event type | Gamma-ray burst  |
|---|---|
| Constellation | Puppis |
| Distance | 1.3 billion light years |
| Other designations | GRB 031203, SN 2003lw |
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GRB 031203 was a gamma-ray burst (GRB) detected on December 3, 2003. A gamma-ray burst is a highly luminous flash associated with an explosion in a distant galaxy and producing gamma rays, the most energetic form of electromagnetic radiation, and often followed by a longer-lived "afterglow" emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, and radio).