The Arcminute Microkelvin Imager Catalogue of Gamma-ray Burst afterglows at 15.7 GHz

Abstract

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 high-energy 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.

47 pages (20 of which are catalogue tables), 10 figures, 4 tables, accepted for publication in MNRAS

References in corpus (14)

• A bright millisecond radio burst of extragalactic origin
• The Supernova -- Gamma-Ray Burst Connection
• A Comprehensive Radio View of the Extremely Bright Gamma-Ray Burst 130427A
• GRB 130925A: an ultra-long Gamma Ray Burst with a dust-echo afterglow, and implications for the origin of the ultra-long GRBs
• The variability timescales and brightness temperatures of radio flares from stars to supermassive black holes
• Probing the Bright Radio Flare and Afterglow of GRB 130427A with the Arcminute Microkelvin Imager
• A Search for Fast Radio Bursts Associated with Gamma-Ray Bursts
• A detailed study of the optical attenuation of gamma-ray bursts in the Swift era
• Synchrotron Self-inverse Compton Radiation From Reverse-shock on GRB120326A
• A prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn
• Late-Time VLA Reobservations Rule Out ULIRG-Like Host Galaxies For Most Pre-Swift Long-Duration Gamma-Ray Bursts
• Detailed Afterglow Modeling and Host Galaxy Properties of the Dark GRB 111215A
• The interpretation of the multi-wavelength afterglow emission of short GRB 140903A
• Calculating transient rates from surveys

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