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

Kumar, Harsh and Bhalerao, Varun and Anupama, G. C. and Barway, Sudhanshu and Coughlin, Michael W. and De, Kishalay and Deshmukh, Kunal and Dutta, Anirban and Goldstein, Daniel A. and Jassani, Adeem and Joharle, Simran and Karambelker, Viraj and Khandagale, Maitreya and Kumar, Brajesh and Saraogi, Divita and Sharma, Yashvi and Shenoy, Vedant and Singer, Leo and Singh, Avinash and 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. doi:10.1093/mnras/stac2516.

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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
Related URLs:
URLURL TypeDescription
Kumar, Harsh0000-0003-0871-4641
Bhalerao, Varun0000-0002-6112-7609
Anupama, G. C.0000-0003-3533-7183
Barway, Sudhanshu0000-0002-3927-5402
Coughlin, Michael W.0000-0002-8262-2924
De, Kishalay0000-0002-8989-0542
Deshmukh, Kunal0000-0001-5253-3480
Dutta, Anirban0000-0002-7708-3831
Goldstein, Daniel A.0000-0003-3461-8661
Jassani, Adeem0000-0003-2191-4541
Joharle, Simran0000-0002-8875-6413
Kumar, Brajesh0000-0001-7225-2475
Sharma, Yashvi0000-0003-4531-1745
Singer, Leo0000-0001-9898-5597
Singh, Avinash0000-0003-2091-622X
Waratkar, Gaurav0000-0003-3630-9440
Additional Information:The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics and the Indian Institute of Technology Bombay with support from the Indo-US Science and Technology Forum (IUSSTF) and the Science and Engineering Research Board (SERB) of the Department of Science and Technology (DST), Government of India. It is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA). We acknowledge funding by the IITB alumni batch of 1994, which partially supports operations of the telescope. Telescope technical details are available at This research has made use of the NASA/IPAC Extragalactic Data base (NED), which is funded by the National Aeronautics and Space Administration and operated by the California Institute of Technology. This research has made use of data and/or services provided by the International Astronomical Union’s Minor Planet Center. This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France (DOI : 10.26093/cds/vizier). The original description of the VizieR service was published in 2000, A&AS 143, 23. This research has made use of NASA’s Astrophysics Data System. HK thanks the LSSTC Data Science Fellowship Programme, which is funded by LSSTC, NSF Cybertraining Grant #1829740, the Brinson Foundation, and the Moore Foundation; his participation in the programme has benefited this work. MC acknowledges support from the National Science Foundation with grant numbers PHY-2010970 and OAC-2117997.
Funding AgencyGrant Number
Indo-US Science and Technology ForumUNSPECIFIED
Science and Engineering Research Board (SERB)UNSPECIFIED
Department of Science and Technology (India)UNSPECIFIED
Indian Institute of Technology BombayUNSPECIFIED
Brinson FoundationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20221003-756400000.28
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117217
Deposited By: Melissa Ray
Deposited On:09 Oct 2022 17:25
Last Modified:09 Oct 2022 17:25

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