GROWTH on S190426c II: GROWTH-India Telescope search for an optical counterpart with a custom image reduction and candidate vetting pipeline

Kumar, Harsh ; Bhalerao, Varun ; Anupama, G C ; Barway, Sudhanshu ; Coughlin, Michael W ; De, Kishalay ; Deshmukh, Kunal ; Dutta, Anirban ; Goldstein, Daniel A ; Jassani, Adeem ; Joharle, Simran ; Karambelker, Viraj ; Khandagale, Maitreya ; Kumar, Brajesh ; Saraogi, Divita ; Sharma, Yashvi ; Shenoy, Vedant ; singer, Leo ; Singh, Avinash ; Waratkar, Gaurav (2022) GROWTH on S190426c II: GROWTH-India Telescope search for an optical counterpart with a custom image reduction and candidate vetting pipeline Monthly Notices of the Royal Astronomical Society, 516 (3). pp. 4517-4528. ISSN 0035-8711

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Official URL: http://doi.org/10.1093/mnras/stac2516

Related URL: http://dx.doi.org/10.1093/mnras/stac2516

Abstract

S190426c/GW190426_152155 was the first probable neutron star–black hole merger candidate detected by the LIGO-Virgo Collaboration. We undertook a tiled search for optical counterparts of this event using the 0.7-m GROWTH-India Telescope. Over a period of two weeks, we obtained multiple observations over a 22.1 deg2 area, with a 17.5 per cent probability of containing the source location. Initial efforts included obtaining photometry of sources reported by various groups, and a visual search for sources in all galaxies contained in the region. Subsequently, we have developed an image subtraction and candidate vetting pipeline with ∼94 per cent efficiency for transient detection. Processing the data with this pipeline, we find several transients, but none that are compatible with kilonova models. We present the details of our observations, the working of our pipeline, results from the search, and our interpretations of the non-detections that will work as a pathfinder during the O4 run of LVK.

Item Type:Article
Source:Copyright of this article belongs to The Royal Astronomical Society
Keywords:methods: data analysis, techniques: image processing, black hole - neutron star mergers, neutron star mergers
ID Code:130564
Deposited On:01 Dec 2022 10:52
Last Modified:01 Dec 2022 10:52

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