short hard bursts

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Short hard bursts S. R. Kulkarni

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Short hard bursts. S. R. Kulkarni. References. This is a tutorial Primary reference: E. Berger (2013) Annual Review GW perspective: Kalsiwal & Nissanke (2013) . Properties. Defined primary by duration (T

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Page 1: Short hard bursts

Short hard bursts

S. R. Kulkarni

Page 2: Short hard bursts

References

• This is a tutorial • Primary reference: E. Berger (2013) Annual

Review• GW perspective: Kalsiwal & Nissanke (2013)

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Properties

• Defined primary by duration (T<2 s) and further refined by hardness ratio

• In the BATSE sample the rate of short hard bursts (SHBs) is one quarter that of the total population (the remaining are Long Soft bursts).

• Less fluence relative to long duration GRBs

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Host Galaxies

• Found in all types of environments– Clusters of galaxies – Elliptical galaxies– Field star forming galaxies

• Interesting Clue: Association with ULRGs– GRB 100206A (dusty ULIRG, z=0.407)– GRB 120804A (dusty ULIRG, z=1.3)– But only 1% of mass is in ULIRGs

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Comparing to other samples

• Long duration GRBs are primarily found in low mass star-forming galaxies

• SHBs appear to trace the field population of star forming galaxies

• Just like SN of type Ia, SHBs arise infield galaxies of both old population and young star forming field galaxies– However the SN rate is higher in star-forming

galaxies

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