The Third Swift Burst Alert Telescope Gamma-Ray Burst Catalog

Lien, A. Y.; Sakamoto, T.; Barthelmy, S. D.; Baumgartner, W. H.; Cannizzo, J. K.; Chen, Kevin; Collins, Nicholas R.; Cummings, J. R.; Gehrels, N.; Krimm, H. A.; Markwardt, C. B.; Palmer, D. M.; Stamatikos, M.; Troja, E.; Ukwatta, T. N.

doi:10.3847/0004-637x/829/1/7

Cited by 290 publications

(348 citation statements)

References 61 publications

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“…We note that a selection effect arising from the trigger criteria for γ-ray telescopes, which may select more tightly beamed events at higher redshift owing to the sensitivity threshold of the detectors, remains a possibility. The observed γ-ray fluence of this event and all the bursts studied in LBT14 is within one standard deviation of the mean for lower-redshift events , with no systematic trend toward lower fluences; however, two out of four z  5 events, GRB140311A and 050904, were located through BAT image triggers, which traditionally find lower luminosity events (Lien et al 2016). We therefore caution that detailed statistical studies should account for possible selection biases due to the criteria used to discover the event.…”

Section: Summary and Discussionmentioning

confidence: 99%

A VLA Study of High-redshift GRBs. I. Multiwavelength Observations and Modeling of GRB 140311A

Laskar

Berger

Chornock

et al. 2018

ApJ

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We present the first results from a recently concluded study of GRBs at z  5 with the Karl G. Jansky Very Large Array (VLA). Spanning 1 to 85.5 GHz and 7 epochs from 1.5 to 82.3 days, our observations of GRB140311A are the most detailed joint radio and millimeter observations of a GRB afterglow at z  5 to date. In conjunction with optical/near-IR and X-ray data, the observations can be understood in the framework of radiation from a single blast wave shock with energy »É 8.5 10 K,iso 53 erg expanding into a constant density environment with density, » n 8 0 -cm 3 . The X-ray and radio observations require a jet break at » t 0.6 jet days, yielding an opening angle of q »  4 jet and a beaming-corrected blast wave kinetic energy of »É 2.2 10 K 50 erg. The results from our radio follow-up and multiwavelength modeling lend credence to the hypothesis that detected high-redshift GRBs may be more tightly beamed than events at lower redshift. We do not find compelling evidence for reverse shock emission, which may be related to fast cooling driven by the moderately high circumburst density.

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Section: Summary and Discussionmentioning

confidence: 99%

A VLA Study of High-redshift GRBs. I. Multiwavelength Observations and Modeling of GRB 140311A

Laskar

Berger

Chornock

et al. 2018

ApJ

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“…2004and Sept. 2016(Lien et al 2016). The results from our likelihood fits for k = 2 and k = 3 are shown in Figs.…”

Section: Swift Grbsmentioning

confidence: 99%

“…Herein, we consider the GRB datasets available from BATSE 1 4B catalog (Paciesas et al 1999), Swift 2 (Lien et al 2016), Fermi-GBM 3 (Narayana Bhat et al 2016 and BeppoSAX 4 (Frontera et al 2009). The number of GRBs analyzed for the model comparison are 2036 from BATSE, 927 from Swift, 1901 from Fermi, and 1003 from BeppoSAX.…”

Section: Datasetsmentioning

confidence: 99%

Classification of gamma-ray burst durations using robust model-comparison techniques

Kulkarni

Desai

2017

Astrophys Space Sci

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Gamma-Ray Bursts (GRBs) have been conventionally bifurcated into two distinct categories dubbed "short" and "long", depending on whether their durations are less than or greater than two seconds respectively. However, many authors have pointed to the existence of a third class of GRBs with mean durations intermediate between the short and long GRBs. Here, we apply multiple model comparison techniques to verify these claims. For each category, we obtain the best-fit parameters by maximizing a likelihood function based on a weighted superposition of two (or three) lognormal distributions. We then do model-comparison between each of these hypotheses by comparing the chi-square probabilities, Akaike Information criterion (AIC), and Bayesian Information criterion (BIC). We uniformly apply these techniques to GRBs from Swift (both observer and intrinsic frame), BATSE, BeppoSAX, and Fermi-GBM. We find that the Swift GRB distributions (in the observer frame) for the entire dataset favor three categories at about 2.4σ from difference in chi-squares, and show decisive evidence in favor of three components using both AIC and BIC. However, when the same analysis is done for the subset of Swift GRBs with measured redshifts, two components are favored with marginal significance. For all the other datasets, evidence for three components is either very marginal or disfavored.

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“…Their sample consists of the radio observed GRBs is the BAT6 sample (BAT6 being the brightest Swift-BAT-detected long GRBs that are considered complete with respect to the flux limit, Salvaterra et al 2012), thus it can be argued that they represent an unbiased sample of GRB radio afterglow properties (for details on Swift GRB selection effects and comparisons to GRBs detected with other instruments see Qin et al 2013;Lien et al 2016).…”

Section: Radio Grb Detection Ratesmentioning

confidence: 99%

The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz

Anderson

Staley

Horst

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present the Arcminute Microkelvin Imager (AMI) Large Array catalogue of 139 gamma-ray bursts (GRBs). AMI observes at a central frequency of 15.7 GHz and is equipped with a fully automated rapid-response mode, which enables the telescope to respond to highenergy transients detected by Swift. On receiving a transient alert, AMI can be on-target within two minutes, scheduling later start times if the source is below the horizon. Further AMI observations are manually scheduled for several days following the trigger. The AMI GRB programme probes the early-time (< 1 day) radio properties of GRBs, and has obtained some of the earliest radio detections (GRB 130427A at 0.36 and GRB 130907A at 0.51 days post-burst). As all Swift GRBs visible to AMI are observed, this catalogue provides the first representative sample of GRB radio properties, unbiased by multi-wavelength selection criteria. We report the detection of six GRB radio afterglows that were not previously detected by other radio telescopes, increasing the rate of radio detections by 50% over an 18-month period. The AMI catalogue implies a Swift GRB radio detection rate of 15%, down to ∼ 0.2 mJy/beam. However, scaling this by the fraction of GRBs AMI would have detected in the Chandra & Frail sample (all radio-observed GRBs between 1997 − 2011), it is possible ∼ 44 − 56% of Swift GRBs are radio bright, down to ∼ 0.1 − 0.15 mJy/beam. This increase from the Chandra & Frail rate (∼ 30%) is likely due to the AMI rapid-response mode, which allows observations to begin while the reverse-shock is contributing to the radio afterglow.

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The Third Swift Burst Alert Telescope Gamma-Ray Burst Catalog

Cited by 290 publications

References 61 publications

A VLA Study of High-redshift GRBs. I. Multiwavelength Observations and Modeling of GRB 140311A

A VLA Study of High-redshift GRBs. I. Multiwavelength Observations and Modeling of GRB 140311A

Classification of gamma-ray burst durations using robust model-comparison techniques

The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz

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