The<i>Swift</i> Burst Analyser

Evans, P. A.; Willingale, R.; Osborne, J. P.; O’Brien, P. T.; Page, K. L.; Markwardt, C. B.; Barthelmy, S. D.; Beardmore, A. P.; Burrows, D. N.; Pagani, C.; Starling, R. L. C.; Gehrels, N.; Romano, P.

doi:10.1051/0004-6361/201014819

Cited by 183 publications

(194 citation statements)

References 14 publications

(19 reference statements)

Supporting

Mentioning

186

Contrasting

Unclassified

Order By: Relevance

“…If the burst emissions extend beyond the event data range, the black-dashed line marks the lower-limit of T 100 (i.e., the end of T 100 found by battblocks, or the end of the event data range if battblocks failed to estimate the burst durations). For GRB090309A, we plot the BAT T 100 flux instead because there are no BAT fluxes produced by the Burst Analyser (Evans et al 2010) for this burst.…”

Section: Bat Sensitivity On Grb Detectionsmentioning

confidence: 99%

“…We further compare these late-time emissions to the Swift/ XRT light curves generated by the Burst Analyser 41 (Evans et al 2010(Evans et al , 2009(Evans et al , 2007. The Burst Analyser can plot the GRB light curves from both the BAT event data and the XRT data in the 15-50 keV range.…”

Section: False-detection Rate: Searching For Weak Emissionmentioning

confidence: 99%

“…Furthermore, many online GRB tables are available. Those that are related to the BAT data include (1) the Swift GRB table 11 compiled by J. D. Myers using information from Gamma-ray Coordinates Network (GCN) circulars, (2) an online GRB catalog 12 maintained by Tilan Ukwatta that contains GRBs from Swift, (3) the Swift Burst Analyser 13 maintained by Phil Evans, which includes plots of both the BAT and XRT light curves at selected energy bands (Evans et al 2009(Evans et al , 2007(Evans et al , 2010, (4) the "Swiftgrb database" 14 produced by Padgett et al, which is completed through 2012 December and includes data product for BAT and XRT, and (5) an online repository 15 generated by (Jung 1989;Rothschild et al 1998). (Jung 1989;Rothschild et al 1998). Nathaniel Butler that includes the XRT and BAT light curves, spectra, and GRB redshifts (Butler et al 2007(Butler et al , 2010.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Third Swift Burst Alert Telescope Gamma-Ray Burst Catalog

Lien

Sakamoto

Barthelmy

et al. 2016

ApJ

301

320

View full text Add to dashboard Cite

To date, the Burst Alert Telescope (BAT) onboard Swift has detected ∼1000 gamma-ray bursts (GRBs), of which ∼360 GRBs have redshift measurements, ranging from z=0.03 to z=9.38. We present the analyses of the BATdetected GRBs for the past ∼11 years up through GRB151027B. We report summaries of both the temporal and spectral analyses of the GRB characteristics using event data (i.e., data for each photon within approximately 250 s before and 950 s after the BAT trigger time), and discuss the instrumental sensitivity and selection effects of GRB detections. We also explore the GRB properties with redshift when possible. The result summaries and data products are available at http://swift.gsfc.nasa.gov/results/batgrbcat/index.html. In addition, we perform searches for GRB emissions before or after the event data using the BAT survey data. We estimate the false detection rate to be only one false detection in this sample. There are 15 ultra-long GRBs (∼2% of the BAT GRBs) in this search with confirmed emission beyond ∼1000 s of event data, and only two GRBs (GRB100316D and GRB101024A) with detections in the survey data prior to the starting of event data.

show abstract

Section: Bat Sensitivity On Grb Detectionsmentioning

confidence: 99%

Section: False-detection Rate: Searching For Weak Emissionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Third Swift Burst Alert Telescope Gamma-Ray Burst Catalog

Lien

Sakamoto

Barthelmy

et al. 2016

ApJ

301

320

View full text Add to dashboard Cite

show abstract

“…UVOT and GROND data were corrected for the Galactic foreground extinction only. of these interpretations, for instance, the presence of a jump in the external medium density profile (Lazzati et al 2002;Dai & Wu 2003;Nakar & Piran 2003) or a discrete episode of energy injection into the fireball (Jóhannesson et al 2006;Fan & Piran 2006;Covino et al 2008;Rossi et al 2011), assume that the whole broad-band light curve is emitted by the same emitting region without requiring two separate components (see also De Pasquale et al 2012).…”

Section: Possible Interpretations Of the Late Rebrigteningmentioning

confidence: 99%

Afterglow rebrightenings as a signature of a long-lasting central engine activity?

Nardini

Elliott

Filgas

et al. 2014

A&A

View full text Add to dashboard Cite

Context. In the past few years the number of well-sampled optical to near-infrared (NIR) light curves of long gamma-ray bursts (GRBs) has greatly increased, particularly due to simultaneous multi-band imagers such as GROND. Combining these densely sampled ground-based data sets with the Swift UVOT and XRT space observations unveils a much more complex afterglow evolution than what was predicted by the most commonly invoked theoretical models. GRB 100814A represents a remarkable example of these interesting well-sampled events, showing a prominent late-time rebrightening in the optical to NIR bands and a complex spectral evolution. This represents a unique laboratory to test the different afterglow emission models. Aims. Here we study the nature of the complex afterglow emission of GRB 100814A in the framework of different theoretical models. Moreover, we compare the late-time chromatic rebrightening with those observed in other well-sampled long GRBs. Methods. We analysed the optical and NIR observations obtained with the seven-channel Gamma-Ray burst Optical and Near-infrared Detector (GROND) at the 2.2 m MPG/ESO telescope together with the X-ray and UV data detected by the instruments onboard the Swift observatory. The broad-band afterglow evolution, achieved by constructing multi-instrument light curves and spectral energy distributions, is discussed in the framework of different theoretical models. Results. We find that the standard models that describe the broad-band afterglow emission within the external shock scenario fail to describe the complex evolution of GRB 100814A, and therefore more complex scenarios must be invoked. The analysis of the very well sampled broad-band light curve of GRB 100814A allowed us to deduce that models invoking late-time activity of the central engine in the observed afterglow emission are the preferred ones for all the different observed features. This late-time activity most likely has the form of a delayed reactivation of the ejecta emission process. However, a more detailed modelling of the radiative mechanisms associated with these scenarios is necessary to arrive at a firm conclusion on the nature of the optical rebrightenings that so often are detected in long GRBs.

show abstract

“…The dotted line is the average observed in the sample of detections and the dashed-dotted line is an estimation of the real average. (Evans et al 2010). The scarce and heterogenous mm/submm coverage does not allow us to obtain a sample of flux densities at a given epoch.…”

Section: Comparison With X-ray Flux Densitiesmentioning

confidence: 99%

Pre-ALMA observations of GRBs in the mm/submm range

Postigo

Lundgren

Martín

et al. 2012

A&A

View full text Add to dashboard Cite

Context. Gamma-ray bursts (GRBs) generate an afterglow emission that can be detected from radio to X-rays during days, or even weeks after the initial explosion. The peak of this emission crosses the millimeter and submillimeter range during the first hours to days, making their study in this range crucial for constraining the models. Observations have been limited until now due to the low sensitivity of the observatories in this range. This situation will be greatly improved with the start of scientific operations of the Atacama Large Millimeter/submillimeter Array (ALMA). Aims. In this work we do a statistical analysis of the complete sample of mm/submm observations of GRB afterglows obtained before the beginning of scientific operations at ALMA. Methods. We present observations of 11 GRB afterglows obtained from the Atacama Pathfinder Experiment (APEX) and the SubMillimeter Array (SMA), as well as the first detection of a GRB with ALMA, still in the commissioning phase, and put them into context with a catalogue of all the observations that have been published until now in the spectral range that is covered by ALMA.Results. The catalogue of mm/submm observations collected here is the largest to date and is composed of 102 GRBs, of which 88 have afterglow observations, whereas the rest are host galaxy searches. With our programmes, we contributed with data of 11 GRBs and the discovery of 2 submm counterparts. In total, the full sample, including data from the literature, has 22 afterglow detections with redshifts ranging from 0.168 to 8.2. GRBs have been detected in mm/submm wavelengths with peak luminosities spanning 2.5 orders of magnitude, the most luminous reaching 10 33 erg s −1 Hz −1 . We observe a correlation between the X-ray brightness at 0.5 days and the mm/submm peak brightness. Finally we give a rough estimate of the distribution of peak flux densities of GRB afterglows, based on the current mm/submm sample. Conclusions. Observations in the mm/submm bands have been shown to be crucial for our understanding of the physics of GRBs, but have until now been limited by the sensitivity of the observatories. With the start of the operations at ALMA, the sensitivity has improved by more than an order of magnitude, opening a new era in the study of GRB afterglows and their host galaxies. Our estimates predict that, once completed, ALMA will detect up to ∼98% of the afterglows if observed during the passage of the peak synchrotron emission.

show abstract

TheSwift Burst Analyser

Cited by 183 publications

References 14 publications

The Third Swift Burst Alert Telescope Gamma-Ray Burst Catalog

The Third Swift Burst Alert Telescope Gamma-Ray Burst Catalog

Afterglow rebrightenings as a signature of a long-lasting central engine activity?

Pre-ALMA observations of GRBs in the mm/submm range

Contact Info

Product

Resources

About