Millimetre detection of GRB 970508

The γ-ray burst source GRB 970508 has been detected as a continuum point source at 86.2 GHz with the IRAM Plateau de Bure Interferometer (PdBI). By combining the UV tables of May 17th, 19th, 21st and 22nd, one obtains a point source flux of 1.62 ± 0.25 mJy, which amounts to a 6.5σ detection. Three i...

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Detalles Bibliográficos
Publicado: 1998
Materias:
Gamma-ray bursts
GRB 970508
Radio continuum observations
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v332_n1_pL13_Bremer
http://hdl.handle.net/20.500.12110/paper_00046361_v332_n1_pL13_Bremer
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00046361_v332_n1_pL13_Bremer
record_format dspace
spelling paper:paper_00046361_v332_n1_pL13_Bremer2023-06-08T14:27:21Z Millimetre detection of GRB 970508 Gamma-ray bursts GRB 970508 Radio continuum observations The γ-ray burst source GRB 970508 has been detected as a continuum point source at 86.2 GHz with the IRAM Plateau de Bure Interferometer (PdBI). By combining the UV tables of May 17th, 19th, 21st and 22nd, one obtains a point source flux of 1.62 ± 0.25 mJy, which amounts to a 6.5σ detection. Three individual tentative detections were made on May 19-22, and the source was only non-detected later with 3σ upper limits between 0.87 and 1.83 mJy. Observations at 232 GHz gave only upper limits. The lowest one from combined May 19 and 21 data is 4.5 mJy (3σ). No significant variation of the source during individual observing dates was seen in either frequency band. Comparing the May 17-22 detection with the later non-detections, we see a significant fading which is not well fitted with the F ∝ t-1.1±0.1 law found at higher frequencies. We exclude that the 86.2 GHz fluxes have been modulated significantly by interstellar scintillation. This indicates that the millimetre characteristics of GRB 970508 provide a new aspect of the intrinsic development of the source. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v332_n1_pL13_Bremer http://hdl.handle.net/20.500.12110/paper_00046361_v332_n1_pL13_Bremer
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Gamma-ray bursts
GRB 970508
Radio continuum observations
spellingShingle Gamma-ray bursts
GRB 970508
Radio continuum observations
Millimetre detection of GRB 970508
topic_facet Gamma-ray bursts
GRB 970508
Radio continuum observations
description The γ-ray burst source GRB 970508 has been detected as a continuum point source at 86.2 GHz with the IRAM Plateau de Bure Interferometer (PdBI). By combining the UV tables of May 17th, 19th, 21st and 22nd, one obtains a point source flux of 1.62 ± 0.25 mJy, which amounts to a 6.5σ detection. Three individual tentative detections were made on May 19-22, and the source was only non-detected later with 3σ upper limits between 0.87 and 1.83 mJy. Observations at 232 GHz gave only upper limits. The lowest one from combined May 19 and 21 data is 4.5 mJy (3σ). No significant variation of the source during individual observing dates was seen in either frequency band. Comparing the May 17-22 detection with the later non-detections, we see a significant fading which is not well fitted with the F ∝ t-1.1±0.1 law found at higher frequencies. We exclude that the 86.2 GHz fluxes have been modulated significantly by interstellar scintillation. This indicates that the millimetre characteristics of GRB 970508 provide a new aspect of the intrinsic development of the source.
title Millimetre detection of GRB 970508
title_short Millimetre detection of GRB 970508
title_full Millimetre detection of GRB 970508
title_fullStr Millimetre detection of GRB 970508
title_full_unstemmed Millimetre detection of GRB 970508
title_sort millimetre detection of grb 970508
publishDate 1998
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v332_n1_pL13_Bremer
http://hdl.handle.net/20.500.12110/paper_00046361_v332_n1_pL13_Bremer
_version_ 1768543013603115008

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