Using GRO J1655-40 to test Swift/BAT as a monitor for bright hard X-ray sources

被引：0
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作者：
Senziani, F. [1 ,2 ,3 ]
Novara, G. [1 ,2 ]
De Luca, A. [2 ,6 ]
Caraveo, A. [2 ]
Belloni, T. [4 ]
Bignami, F. [5 ,6 ]
机构：
[1] Università di Pavia, Dipartimento di Fisica Teorica e Nucleare, via Ugo Bassi 6, 27100 Pavia (I), Italy
[2] INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, via Bassini 15, 20133 Milano (I), Italy
[3] Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France
[4] INAF-Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), Italy
[5] Agenzia Spaziale Italiana, via Liegi 26, 00198 Roma, Italy
[6] Istituto Universitario di Studi Superiori (IUSS), V. le Lungo Ticino Sforza 56, 27100 Pavia (I), Italy
来源：
Astronomy and Astrophysics | 2007年 / 476卷 / 03期
关键词：
Context.While waiting for new gamma-ray burst detections; the Burst Alert Telescope (BAT) onboard Swift covers each day ∼50% of the sky in the hard X-ray band (Survey data). The large field of view (FOV); high sensitivity and good angular resolution make BAT a potentially powerful all-sky hard X-ray monitor; provided that mask-related systematics can be properly accounted for.Aims.We have developed and tested a complete procedure entirely based on public Swift/BAT software tools to analyse BAT Survey data; aimed at assessing the flux and spectral variability of bright sources in the 15-150 keV energy range.Methods.Detailed tests of the capabilities of our procedure were performed focusing; in particular; on the reliability of spectral measurements over the entire BAT FOV. First; we analyzed a large set of Crab observations; spread over ∼7 months. Next; we studied the case of GRO J1655-40; a strongly variable source; which experienced a 9-month long outburst; beginning on February 2005. The outburst was systematically monitored with the well-calibrated PCA and HEXTE instruments onboard the RXTE mission. Due to the good BAT temporal coverage of the source; we have been able to cross-check BAT light-curves with simultaneous HEXTE ones.Results.The Crab tests have shown that our procedure recovers both the flux and the source spectral shape over the whole FOV of the BAT instrument. Moreover; by cross-checking GRO J1655-40 light-curves obtained with BAT and HEXTE; we found the spectral and flux evolution of the outburst to be in very good agreement. Using our procedure; BAT reproduces HEXTE fluxes within a 10-15% uncertainty with a sensitivity of ∼20 mCrab for an on-axis source; thus establishing its ability to monitor the evolution of relatively bright hard X-rays sources. . © 2007 ESO;
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页码：1297 / 1305
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