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The search for fast transients with CZTI

Sharma, Y. and Marathe, A. and Bhalerao, V. and Shenoy, V. and Waratkar, G. and Nadella, D. and Page, P. and Hebbar, P. and Vibhute, A. and Bhattacharya, D. and Rao, A. R. and Vadawale, S. (2021) The search for fast transients with CZTI. Journal of Astrophysics and Astronomy, 42 (2). Art. No. 73. ISSN 0250-6335. doi:10.1007/s12036-021-09714-6. https://resolver.caltech.edu/CaltechAUTHORS:20201209-113403455

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Abstract

The Cadmium–Zinc–Telluride Imager on AstroSat has proven to be a very effective All-Sky monitor in the hard X-ray regime, detecting over three hundred GRBs and putting highly competitive upper limits on X-ray emissions from gravitational wave sources and fast radio bursts. We present the algorithms used for searching for such transient sources in CZTI data, and for calculating upper limits in case of non-detections. We introduce CIFT: the CZTI Interface for Fast Transients, a framework used to streamline these processes. We present details of 87 new GRBs detected by this framework that were previously not detected in CZTI.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1007/s12036-021-09714-6DOIArticle
https://rdcu.be/coxozPublisherFree ReadCube access
https://arxiv.org/abs/2011.07067arXivDiscussion Paper
https://github.com/jnothman/upsetplot/Related ItemCode
ORCID:
AuthorORCID
Sharma, Y.0000-0003-4531-1745
Marathe, A.0000-0002-8869-8137
Bhalerao, V.0000-0002-6112-7609
Shenoy, V.0000-0002-6429-8139
Waratkar, G.0000-0003-3630-9440
Nadella, D.0000-0003-4942-6873
Page, P.0000-0002-8239-9670
Hebbar, P.0000-0002-4961-4690
Vibhute, A.0000-0003-1501-6972
Bhattacharya, D.0000-0003-3352-3142
Rao, A. R.0000-0003-0833-0533
Vadawale, S.0000-0002-2050-0913
Additional Information:© 2021 Indian Academy of Sciences. Received 03 November 2020; Accepted 17 January 2021; Published 06 July 2021. CZT-Imager is built by a consortium of Institutes across India. The Tata Institute of Fundamental Research, Mumbai, led the effort with instrument design and development. Vikram Sarabhai Space Centre, Thiruvananthapuram provided the electronic design, assembly and testing. ISRO Satellite Centre (ISAC), Bengaluru provided the mechanical design, quality consultation and project management. The Inter University Centre for Astronomy and Astrophysics (IUCAA), Pune did the Coded Mask design, instrument calibration, and Payload Operation Centre. Space Application Centre (SAC) at Ahmedabad provided the analysis software. Physical Research Laboratory (PRL) Ahmedabad, provided the polarisation detection algorithm and ground calibration. A vast number of industries participated in the fabrication and the University sector pitched in by participating in the test and evaluation of the payload. The Indian Space Research Organisation funded, managed and facilitated the project. This work utilised various software including Python, AstroPy (Robitaille et al. 2013), NumPy (van der Walt et al. 2011), Matplotlib (Hunter 2007), https://github.com/jnothman/upsetplot/UpSetPlot (Lex et al. 1983), and ngrok.
Funders:
Funding AgencyGrant Number
Indian Space Research OrganisationUNSPECIFIED
Subject Keywords:Stars: gamma-ray burst: general—X-rays: bursts—methods: data analysis
Issue or Number:2
DOI:10.1007/s12036-021-09714-6
Record Number:CaltechAUTHORS:20201209-113403455
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201209-113403455
Official Citation:Sharma, Y., Marathe, A., Bhalerao, V. et al. The search for fast transients with CZTI. J Astrophys Astron 42, 73 (2021). https://doi.org/10.1007/s12036-021-09714-6
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106977
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:09 Dec 2020 21:08
Last Modified:14 Jul 2021 22:18

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