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The POLAR Gamma-Ray Burst Polarization Catalog
High Energy Astrophysical Phenomena · Submitted 10 Sep 2020
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The time integrated analysis finds all results to be compatible with a low or zero polarization with the caveat that, when time-resolved analysis is possible within individual pulses, we observe moderate polarization with a rapidly changing polarization angle.
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The abstract, sentence by sentence
Despite over 50 years of research, many open questions remain about the origin and nature of GRBs. Polarization measurements of the prompt emission of these extreme phenomena have long been thought to be the key to answering a range of these questions. The POLAR detector was designed to produce the first set of detailed and reliable polarization measurements in an energy range of approximately 50-500 keV. During late 2016 and early 2017, POLAR detected a total of 55 GRBs. Analysis results of 5 of these GRBs have been reported in the past. The results were found to be consistent with a low or unpolarized flux. However, previous reports by other collaborations found high levels of polarization. We study the polarization for all the 14 GRBs observed by POLAR for which statistically robust inferences are possible. Additionally, time-resolved polarization studies are performed on GRBs with sufficient apparent flux. A publicly available polarization analysis tool, developed within the 3ML framework, was used to produce statistically robust results. The method allows to combine spectral and polarimetric data from POLAR with spectral data from the Fermi GBM and Swift-BAT to jointly model the spectral and polarimetric parameters. The time integrated analysis finds all results to be compatible with a low or zero polarization with the caveat that, when time-resolved analysis is possible within individual pulses, we observe moderate polarization with a rapidly changing polarization angle. Thus, time-integrated polarization results, while pointing to lower polarization are potentially an artifact of summing over the changing polarization signal and thus, washing out the true moderate polarization. Therefore, we caution against over interpretation of any time-integrated results and encourage one to wait for more detailed polarization measurements from forthcoming missions such as POLAR-2 and LEAP.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Despite over 50 years of research, many open questions remain about the origin and nature of GRBs. | background 0.90 | 0.04 | 0.01 | asserted 1.00 |
| s1 | Polarization measurements of the prompt emission of these extreme phenomena have long been thought to be the key to answering a range of these questions. | background 0.99 | 0.05 | 0.02 | hedged possibility 0.69 |
| s2 | The POLAR detector was designed to produce the first set of detailed and reliable polarization measurements in an energy range of approximately 50-500 keV. | method 0.66 | 0.33 | 0.02 | asserted 1.00 |
| s3 | During late 2016 and early 2017, POLAR detected a total of 55 GRBs. | method 0.56 | 0.94 | 0.02 | asserted 1.00 |
| s4 | Analysis results of 5 of these GRBs have been reported in the past. | background 0.74 | 0.36 | 0.02 | asserted 1.00 |
| s5 | The results were found to be consistent with a low or unpolarized flux. | result 0.86 | 0.81 | 0.07 | asserted 0.99 |
| s6 | However, previous reports by other collaborations found high levels of polarization. | background 0.74 | 0.04 | 0.02 | asserted 1.00 |
| s7 | We study the polarization for all the 14 GRBs observed by POLAR for which statistically robust inferences are possible. | contribution 0.99 | 0.88 | 0.05 | asserted 0.97 |
| s8 | Additionally, time-resolved polarization studies are performed on GRBs with sufficient apparent flux. | contribution 0.77 | 0.93 | 0.03 | asserted 1.00 |
| s9 | A publicly available polarization analysis tool, developed within the 3ML framework, was used to produce statistically robust results. | method 0.99 | 0.69 | 0.02 | asserted 1.00 |
| s10 | The method allows to combine spectral and polarimetric data from POLAR with spectral data from the Fermi GBM and Swift-BAT to jointly model the spectral and polarimetric parameters. | method 1.00 | 0.72 | 0.03 | asserted 0.99 |
| s11 | The time integrated analysis finds all results to be compatible with a low or zero polarization with the caveat that, when time-resolved analysis is possible within individual pulses, we observe moderate polarization with a rapidly changing polarization angle. | result 0.99 | 0.95 | 0.67 | hedged possibility 0.53 |
| s12 | Thus, time-integrated polarization results, while pointing to lower polarization are potentially an artifact of summing over the changing polarization signal and thus, washing out the true moderate polarization. | interpretation 0.99 | 0.77 | 0.40 | hedged possibility 0.91 |
| s13 | Therefore, we caution against over interpretation of any time-integrated results and encourage one to wait for more detailed polarization measurements from forthcoming missions such as POLAR-2 and LEAP. | future work 0.95 | 0.32 | 0.27 | hedged possibility 0.66 |
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The paper
Original abstract
Despite over 50 years of research, many open questions remain about the origin and nature of GRBs. Polarization measurements of the prompt emission of these extreme phenomena have long been thought to be the key to answering a range of these questions. The POLAR detector was designed to produce the first set of detailed and reliable polarization measurements in an energy range of approximately 50-500 keV. During late 2016 and early 2017, POLAR detected a total of 55 GRBs. Analysis results of 5 of these GRBs have been reported in the past. The results were found to be consistent with a low or unpolarized flux. However, previous reports by other collaborations found high levels of polarization. We study the polarization for all the 14 GRBs observed by POLAR for which statistically robust inferences are possible. Additionally, time-resolved polarization studies are performed on GRBs with sufficient apparent flux. A publicly available polarization analysis tool, developed within the 3ML framework, was used to produce statistically robust results. The method allows to combine spectral and polarimetric data from POLAR with spectral data from the Fermi GBM and Swift-BAT to jointly model the spectral and polarimetric parameters. The time integrated analysis finds all results to be compatible with a low or zero polarization with the caveat that, when time-resolved analysis is possible within individual pulses, we observe moderate polarization with a rapidly changing polarization angle. Thus, time-integrated polarization results, while pointing to lower polarization are potentially an artifact of summing over the changing polarization signal and thus, washing out the true moderate polarization. Therefore, we caution against over interpretation of any time-integrated results and encourage one to wait for more detailed polarization measurements from forthcoming missions such as POLAR-2 and LEAP.
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References
How the literature uses it
5 arXiv papers cite this in 12 sentences
Papers citing it · 11 sentences without a confident label
Uses its data or values 1 paper
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POLAR only finds hints of an evolving PA for 2 GRBs in their catalog, GRB 170114A and 170101A [ref] .
GRB Polarization: A Unique Probe of GRB Physics · Time Resolved measurements · 0.89
What it cites · 1 sentence without a confident label
Uses the method or tool of 1 paper
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All this analysis can be performed directly using the framework [ref] which contains both spectral analysis and a polarization analysis tool.
The Multi-Mission Maximum Likelihood framework (3ML) · Improved analysis using · 1.00
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