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  • NAM2019
    • Registration
    • Key Dates & Outline Schedule
    • Practical Information
    • Exhibitors
    • Grants & Bursaries
    • Contacts
  • Science
    • Science Programme
    • Parallel Sessions
    • Plenary Talks
    • Community Session
    • Special Lunches
    • Posters
    • Presenter Guidelines
  • Social
    • What's On
    • Welcome Reception
    • RAS Awards Dinner
  • Media
  • Outreach
    • Outreach and Education Day
    • Fringe Event
    • School Visit Day
  • Lancaster
    • Travel
    • Accommodation
    • Childcare
    • Campus Map
    • About Lancaster
    • Code of Conduct

Wednesday

Schedule

id
date time
AM
09:35
Abstract
The Rate of SGRBs in the Local Universe
Wednesday

Abstract details

id
The Rate of SGRBs in the Local Universe
Date Submitted
2019-03-11 18:35:39
Soheb
Mandhai
University of Leicester
Gravitational waves & multimessenger astronomy
Talk
S. Mandhai (University of Leicester), N. Tanvir (University of Leicester), G. Lamb (University of Leicester), A. Levan (University of Warwick), D. Tsang (University of Bath)
Following the faint gamma-ray burst, GRB 170817A, coincident with a gravitational wave-detected binary neutron star merger at d∼40 Mpc, we consider the constraints on a local population of faint short duration GRBs (defined here broadly as T904 s). We review proposed low-redshift short-GRBs and consider statistical limits on a d⪅200 Mpc population using Swift/Burst Alert Telescope (BAT), Fermi/Gamma-ray Burst Monitor (GBM), and Compton Gamma-Ray Observatory (CGRO) Burst and Transient Source Experiment (BATSE) GRBs. Swift/BAT short-GRBs give an upper limit for the all-sky rate of 4 y−1 at d200 Mpc, corresponding to 5% of SGRBs. Cross-correlation of selected CGRO/BATSE and Fermi/GBM GRBs with d100 Mpc galaxy positions returns a weaker constraint of ⪅12 y−1. A separate search for correlations due to SGR giant flares in nearby (d11 Mpc) galaxies finds an upper limit of 3 y−1. Our analysis suggests that GRB 170817A-like events are likely to be rare in existing SGRB catalogues. The best candidate for an analogue remains GRB 050906, where the Swift/BAT location was consistent with the galaxy IC0327 at d≈132 Mpc. If binary neutron star merger rates are at the high end of current estimates, then our results imply that at most a few percent will be accompanied by detectable gamma-ray flashes in the forthcoming LIGO/Virgo science runs.

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