Investigating the nature of INTEGRAL Gamma-ray Bursts and sub-threshold triggers with Swift follow-up
Investigating the nature of INTEGRAL Gamma-ray Bursts and sub-threshold triggers with Swift follow-up
We explore the potential of INTEGRAL to improve our understanding of the low fluence regime for explosive transients, such as GRBs. We probe the nature of the so-called ”WEAK” INTEGRAL triggers, when the gamma-ray instruments record intensity spikes that are below the usual STRONG significance thresholds. In a targeted Swift follow-up campaign, we observed 15 WEAK triggers. We find six of these can be classified as GRBs. This includes GRB 150305A, a GRB discovered from our campaign alone. We also identified a source coincident with one trigger, IGRW 151019, as a candidate AGN. We show that real events such as GRBs exist within the IBAS WEAK trigger population. A comparison of the fluence distributions of the full INTEGRAL IBAS and Swift BAT GRB samples showed that the two are similar. We also find correlations between the prompt gamma-ray and X-ray properties of the two samples, supporting previous investigations. We find that both satellites reach similar, low fluence levels regularly, although Swift is more sensitive to short, low fluence GRBs.
Higgins, A.B.
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Starling, R.L.C.
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Götz, D.
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Mereghetti, S.
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Wiersema, K.
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Maccarone, T.
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Osborne, J.P.
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Tanvir, N.R.
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O'Brien, P.T.
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Bird, A.J.
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Rowlinson, A.
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Gehrels, N.
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Higgins, A.B.
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Starling, R.L.C.
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Götz, D.
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Mereghetti, S.
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Wiersema, K.
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Maccarone, T.
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Osborne, J.P.
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Tanvir, N.R.
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O'Brien, P.T.
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Bird, A.J.
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Rowlinson, A.
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Gehrels, N.
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Higgins, A.B., Starling, R.L.C., Götz, D., Mereghetti, S., Wiersema, K., Maccarone, T., Osborne, J.P., Tanvir, N.R., O'Brien, P.T., Bird, A.J., Rowlinson, A. and Gehrels, N.
(2017)
Investigating the nature of INTEGRAL Gamma-ray Bursts and sub-threshold triggers with Swift follow-up.
Monthly Notices of the Royal Astronomical Society.
(doi:10.1093/mnras/stx1163).
Abstract
We explore the potential of INTEGRAL to improve our understanding of the low fluence regime for explosive transients, such as GRBs. We probe the nature of the so-called ”WEAK” INTEGRAL triggers, when the gamma-ray instruments record intensity spikes that are below the usual STRONG significance thresholds. In a targeted Swift follow-up campaign, we observed 15 WEAK triggers. We find six of these can be classified as GRBs. This includes GRB 150305A, a GRB discovered from our campaign alone. We also identified a source coincident with one trigger, IGRW 151019, as a candidate AGN. We show that real events such as GRBs exist within the IBAS WEAK trigger population. A comparison of the fluence distributions of the full INTEGRAL IBAS and Swift BAT GRB samples showed that the two are similar. We also find correlations between the prompt gamma-ray and X-ray properties of the two samples, supporting previous investigations. We find that both satellites reach similar, low fluence levels regularly, although Swift is more sensitive to short, low fluence GRBs.
Text
Investigating the nature of INTEGRAL Gamma-ray bursts
- Accepted Manuscript
More information
Accepted/In Press date: 8 May 2017
e-pub ahead of print date: 12 May 2017
Organisations:
Astronomy Group
Identifiers
Local EPrints ID: 410080
URI: http://eprints.soton.ac.uk/id/eprint/410080
ISSN: 1365-2966
PURE UUID: c224f191-5caf-4554-ba2c-e51d733ce4f9
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Date deposited: 03 Jun 2017 04:02
Last modified: 16 Mar 2024 02:43
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Contributors
Author:
A.B. Higgins
Author:
R.L.C. Starling
Author:
D. Götz
Author:
S. Mereghetti
Author:
K. Wiersema
Author:
T. Maccarone
Author:
J.P. Osborne
Author:
N.R. Tanvir
Author:
P.T. O'Brien
Author:
A. Rowlinson
Author:
N. Gehrels
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