GRB 020813

GRB 020813 was a gamma-ray burst (GRB) that was detected on 13 August 2002 at 02:44 UTC. 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).

GRB 020813
Other designationsGRB 020813, GRB 020813A
Event typeGamma-ray burst 
Date13 August 2002 
Duration25 ±1 second 
InstrumentHigh Energy Transient Explorer 
ConstellationSagittarius 
Right ascension 19h 46m 38s
Declination−19° 35′ 16″
Redshift1.254 ±0.001, 1.255 

Observations

GRB 020813 was detected on 13 August 2002 02:44 UTC by multiple instruments on the High Energy Transient Explorer. The burst lasted approximately 125 seconds. The initial position was estimated to be at a right ascension of  19h 46m 38s and a declination of −19° 35′ 16″.[1] In less than two hours after the burst had been detected, optical observations of the region were made with the Katzman Automatic Imaging Telescope which reveal the burst's optical afterglow.[2] In the days following the event, observations were made by the Chandra X-ray Observatory, which detected a fading X-ray afterglow.[3] The redshift for this event was approximately z = 1.254.[4]

Supernova relation

Previous to this burst, there had not yet been any concrete evidence linking gamma-ray bursts to supernovae, though it had long been hypothesized that the two phenomena were results of the same type of event. The spectrum of GRB 011211 was reported to include emission lines associated with the chemical elements magnesium, silicon, sulphur, argon, and calcium, which supported the theory that gamma-ray bursts are preceded by highly massive stars undergoing a supernova collapse.[5] However, these results were considered statistically insignificant and somewhat controversial due to the low resolution of the instruments used.[6] The spectrum of GRB 020813 was also found to display emission lines of elements associated with supernovae, in this case sulphur and silicon.[6] This evidence confirmed the connection between supernovae and gamma-ray bursts.[7][8]

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References
  1. Lamb, Don (13 August 2002). "GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time". GCN Circulars. 1471: 1. Bibcode:2002GCN..1471....1V.
  2. Li, Weidong (13 August 2002). "GRB020813: optical afterglow". GCN Circulars. 1473: 1. Bibcode:2002GCN..1473....1L.
  3. Ricker, George (19 August 2002). "GRB020813: Fading X-ray Afterglow Observed with Chandra". GCN Circulars. 1504: 1. Bibcode:2002GCN..1504....1V.
  4. Price, Paul (13 August 2002). "GRB 020813: Absorption redshift". GCN Circulars. 1475: 1. Bibcode:2002GCN..1475....1P.
  5. Reeves, J. N.; et al. (April 2002). "The signature of supernova ejecta in the X-ray afterglow of the γ-ray burst 011211". Nature. 416 (6880): 512–515. arXiv:astro-ph/0204075. Bibcode:2002Natur.416..512R. doi:10.1038/416512a. PMID 11932738. S2CID 4407892.
  6. Butler, Nathaniel R.; et al. (10 November 2003). "The X-ray Afterglows of GRB 020813 and GRB 021004 with Chandra HETGS: Possible Evidence for a Supernova prior to GRB 020813". The Astrophysical Journal. 597 (2): 1010–1016. arXiv:astro-ph/0303539. Bibcode:2003ApJ...597.1010B. doi:10.1086/378511. S2CID 6171688.
  7. "Cosmic Forensics Confirms Gamma-Ray Burst And Supernova Connection" (Press release). NASA. 24 March 2003. Retrieved 23 May 2010.
  8. Fazekas, Andrew (2 April 2003). "Supernova is 'smoking gun' in gamma-ray-burst whodunit". Astronomy. Retrieved 23 May 2010.
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