{
  "bibcode": "2019GCN.25632....1K",
  "body": "Harsh Kumar (IITB), Anirban Dutta (IIA), Gaurav Waratkar (IITB), Kunal\nDeshmukh (IITB), Maitreya Khandagale (IITB), Avinash Singh (IIA), Erik Kool\n(OKC), Varun Bhalerao (IITB), G. C. Anupama (IIA), Urgain Stanzin (IIA)\nreport on behalf of the GROWTH collaboration:\n\nWe observed the optical counterpart candidate ZTF19abvionh (Erik Kool et\nal. GCN 25616, M. J. B. Rosell et al. GCN 25622, GCN 25624) of the\ngravitational\nwave trigger S190901ap (LVC et al. GCN 25606, GCN 25614) with the 0.7m\nGROWTH-India telescope. We obtained a series of exposures, each 600 sec\nlong, in SDSS-r filter starting from 2458729.15950926 JD. We used PS1\ncatalog images for image subtraction. The candidate was clearly detected in\nthe subtracted images. Photometry of the subtracted images is reported\nbelow:\n\n------------------------------------------------------------------\n\nJD(Start) | Name | Filter | Mag | Mar_err|\n\n------------------------------------------------------------------\n\n2458729.15950926 | ZTF19abvionh | r | 20.81 | 0.117\n\n2458729.16622148 | ZTF19abvionh | r | 20.83 | 0.088\n\n2458729.20642199 | ZTF19abvionh | r | 20.56 | 0.108\n\n2458729.21345010 | ZTF19abvionh | r | 20.50 | 0.088\n\n------------------------------------------------------------------\n\nOur measurements indicate a rise in the r-band brightness of the candidate.\nFurther observations are planned. We encourage further monitoring of this\ncandidate.\n\n\nThe GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7 degree\nfield of view, set up by the Indian Institute of Astrophysics and the\nIndian Institute of Technology Bombay with support from the Indo-US Science\nand Technology Forum (IUSSTF) and the Science and Engineering Research\nBoard (SERB) of the Department of Science and Technology (DST), Government\nof India (https://sites.google.com/view/growthindia/). It is located at the\nIndian Astronomical Observatory (Hanle), operated by the Indian Institute\nof Astrophysics (IIA).",
  "circularId": 25632,
  "createdOn": 1567528809000,
  "email": "gauravwaratkar24@gmail.com",
  "subject": "LIGO/Virgo S190901ap: GROWTH-India follow-up of ZTF19abvionh",
  "submitter": "Gaurav Waratkar at IIT Bombay  <gauravwaratkar24@gmail.com>",
  "eventId": "LIGO/Virgo S190901ap"
}