The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz
<p>We present the Arcminute Microkelvin Imager (AMI) Large Array catalogue of 139 gammaray 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 Swi...
| Autors principals: | , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Publicat: |
Oxford University Press
2017
|
| _version_ | 1826290638553874432 |
|---|---|
| author | Anderson, G Staley, T van der Horst, A Fender, R Rowlinson, A Mooley, K Broderick, J Wijers, R Rumsey, C Titterington, D |
| author_facet | Anderson, G Staley, T van der Horst, A Fender, R Rowlinson, A Mooley, K Broderick, J Wijers, R Rumsey, C Titterington, D |
| author_sort | Anderson, G |
| collection | OXFORD |
| description | <p>We present the Arcminute Microkelvin Imager (AMI) Large Array catalogue of 139 gammaray 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 2 min, 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 d) radio properties of GRBs, and has obtained some of the earliest radio detections (GRB 130427A at 0.36 and GRB 130907A at 0.51 d post-burst). As all Swift GRBs visible to AMI are observed, this catalogue provides the first representative sample of GRB radio properties, unbiased by multiwavelength 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 per cent over an 18-month period. The AMI catalogue implies a Swift GRB radio detection rate of ≳15 per cent, down to∼0.2mJy beam−1. However, scaling this by the fraction of GRBs AMI would have detected in the Chandra & Frail sample (all radio-observed GRBs between 1997 and 2011), it is possible ∼44–56 per cent of Swift GRBs are radio bright, down to ∼0.1–0.15 mJy beam−1. This increase from the Chandra & Frail rate (∼30 per cent) is likely due to the AMI rapid-response mode, which allows observations to begin while the reverse-shock is contributing to the radio afterglow.</p> |
| first_indexed | 2024-03-07T02:47:15Z |
| format | Journal article |
| id | oxford-uuid:ac731f88-6e47-458c-a892-3f69913b32b9 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T02:47:15Z |
| publishDate | 2017 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:ac731f88-6e47-458c-a892-3f69913b32b92022-03-27T03:29:08ZThe Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHzJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ac731f88-6e47-458c-a892-3f69913b32b9Symplectic Elements at OxfordOxford University Press2017Anderson, GStaley, Tvan der Horst, AFender, RRowlinson, AMooley, KBroderick, JWijers, RRumsey, CTitterington, D<p>We present the Arcminute Microkelvin Imager (AMI) Large Array catalogue of 139 gammaray 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 2 min, 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 d) radio properties of GRBs, and has obtained some of the earliest radio detections (GRB 130427A at 0.36 and GRB 130907A at 0.51 d post-burst). As all Swift GRBs visible to AMI are observed, this catalogue provides the first representative sample of GRB radio properties, unbiased by multiwavelength 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 per cent over an 18-month period. The AMI catalogue implies a Swift GRB radio detection rate of ≳15 per cent, down to∼0.2mJy beam−1. However, scaling this by the fraction of GRBs AMI would have detected in the Chandra & Frail sample (all radio-observed GRBs between 1997 and 2011), it is possible ∼44–56 per cent of Swift GRBs are radio bright, down to ∼0.1–0.15 mJy beam−1. This increase from the Chandra & Frail rate (∼30 per cent) is likely due to the AMI rapid-response mode, which allows observations to begin while the reverse-shock is contributing to the radio afterglow.</p> |
| spellingShingle | Anderson, G Staley, T van der Horst, A Fender, R Rowlinson, A Mooley, K Broderick, J Wijers, R Rumsey, C Titterington, D The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz |
| title | The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz |
| title_full | The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz |
| title_fullStr | The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz |
| title_full_unstemmed | The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz |
| title_short | The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz |
| title_sort | arcminute microkelvin imager catalogue of gamma ray burst afterglows at 15 7 ghz |
| work_keys_str_mv | AT andersong thearcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT staleyt thearcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT vanderhorsta thearcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT fenderr thearcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT rowlinsona thearcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT mooleyk thearcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT broderickj thearcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT wijersr thearcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT rumseyc thearcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT titteringtond thearcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT andersong arcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT staleyt arcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT vanderhorsta arcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT fenderr arcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT rowlinsona arcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT mooleyk arcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT broderickj arcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT wijersr arcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT rumseyc arcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz AT titteringtond arcminutemicrokelvinimagercatalogueofgammarayburstafterglowsat157ghz |