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http://hdl.handle.net/20.500.12386/26774
Titolo: | Investigating the nature of the INTEGRAL gamma-ray bursts and sub-threshold triggers with Swift follow-up | Autori: | Higgins, A. B. Starling, R. L. C. Götz, D. MEREGHETTI, Sandro Wiersema, K. Maccarone, T. Osborne, J. P. Tanvir, N. R. O'Brien, P. T. Bird, A. J. Rowlinson, A. Gehrels, N. |
Data pubblicazione: | 2017 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 470 | Fascicolo: | 1 | Da pagina:: | 314 | Abstract: | We explore the potential of the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) to improve our understanding of the low-fluence regime for explosive transients, such as Gamma-ray Bursts (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 active galactic nucleus. We show that real events such as GRBs exist within the INTEGRAL Burst Alert System (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. | URI: | http://hdl.handle.net/20.500.12386/26774 | URL: | https://arxiv.org/abs/1709.07233 https://academic.oup.com/mnras/article-abstract/470/1/314/3820928?redirectedFrom=fulltext |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx1163 | Bibcode ADS: | 2017MNRAS.470..314H | Fulltext: | open |
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