Localisation of Gamma Ray Bursts using AstroSat Mass Model
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Saraogi, Divita Aditya, J Venkata Bhalerao, Varun Bala, Suman Balasubramanian, Arvind Mate, Sujay Chattopadhyay, Tanmoy Gupta, Soumya Prasad, Vipul Waratkar, Gaurav K, Navaneeth P Gopalakrishnan, Rahul Bhattacharya, Dipankar Dewangan, Gulab Vadawale, Santosh |
| author_facet | Saraogi, Divita Aditya, J Venkata Bhalerao, Varun Bala, Suman Balasubramanian, Arvind Mate, Sujay Chattopadhyay, Tanmoy Gupta, Soumya Prasad, Vipul Waratkar, Gaurav K, Navaneeth P Gopalakrishnan, Rahul Bhattacharya, Dipankar Dewangan, Gulab Vadawale, Santosh |
| contents | The Cadmium Zinc Telluride Imager (CZTI) aboard AstroSat has good sensitivity to Gamma Ray Bursts (GRBs), with close to 600 detections including about 50 discoveries undetected by other missions. However, CZTI was not designed to be a GRB monitor and lacks localisation capabilities. We introduce a new method of localising GRBs using "shadows" cast on the CZTI detector plane due to absorption and scattering by satellite components and instruments. Comparing the observed distribution of counts on the detector plane with simulated distributions with the AstroSat Mass Model, we can localise GRBs in the sky. Our localisation uncertainty is defined by a two-component model, with a narrow Gaussian component that has close to 50% probability of containing the source, and the remaining spread over a broader Gaussian component with an 11.3 times higher $σ$. The width ($σ$) of the Gaussian components scales inversely with source counts. We test this model by applying the method to GRBs with known positions and find good agreement between the model and observations. This new ability expands the utility of CZTI in the study of GRBs and other rapid high-energy transients. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_16404 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Localisation of Gamma Ray Bursts using AstroSat Mass Model Saraogi, Divita Aditya, J Venkata Bhalerao, Varun Bala, Suman Balasubramanian, Arvind Mate, Sujay Chattopadhyay, Tanmoy Gupta, Soumya Prasad, Vipul Waratkar, Gaurav K, Navaneeth P Gopalakrishnan, Rahul Bhattacharya, Dipankar Dewangan, Gulab Vadawale, Santosh High Energy Astrophysical Phenomena The Cadmium Zinc Telluride Imager (CZTI) aboard AstroSat has good sensitivity to Gamma Ray Bursts (GRBs), with close to 600 detections including about 50 discoveries undetected by other missions. However, CZTI was not designed to be a GRB monitor and lacks localisation capabilities. We introduce a new method of localising GRBs using "shadows" cast on the CZTI detector plane due to absorption and scattering by satellite components and instruments. Comparing the observed distribution of counts on the detector plane with simulated distributions with the AstroSat Mass Model, we can localise GRBs in the sky. Our localisation uncertainty is defined by a two-component model, with a narrow Gaussian component that has close to 50% probability of containing the source, and the remaining spread over a broader Gaussian component with an 11.3 times higher $σ$. The width ($σ$) of the Gaussian components scales inversely with source counts. We test this model by applying the method to GRBs with known positions and find good agreement between the model and observations. This new ability expands the utility of CZTI in the study of GRBs and other rapid high-energy transients. |
| title | Localisation of Gamma Ray Bursts using AstroSat Mass Model |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2401.16404 |