{
  "bibcode": "2020GCN.27598....1K",
  "body": "H. Kumar, M. Khandagale, K. Deshmukh, V. Bhalerao(IITB), G. C. Anupama, B. Kumar, A. Singh, A. Dutta, S. Barway(IIA), P. Dorji (IAO), U. Stanzin (IAO), report on behalf of the GROWTH collaboration:\n\nWe observed GRB200412B reported by Fermi GBM Team (GCN 27547) and Burgess J. et al, (GCN 27548) with 0.7m robotic GROWTH-India telescope. We switched from tiled observations to targeted follow-up based on the afterglow identification by Lipunov V. et al, (GCN 27555) at RA(J2000) = 18:33:15.33  Dec(J2000) = +62:31:57.0 . The field was observed multiple times in g and r filters with 550 sec exposure time, starting about 7.4 hours after the trigger. We clearly detect the afterglow emission. The decay is well-described by a power law with alpha = 1.05 +/- 0.14 for g band data and 0.85 +/- 0.17 for r band data.\n\nWe obtained the following results:\n------------------------------------------------------------------\n JD(Start)| Exposure(sec) | Filter | Mag | lim_Mag |\n------------------------------------------------------------------\n2458952.1903 | 550 |  g  |  18.301+/-0.034 |  20.92  \n2458952.3277 | 550 |  g  |  18.590+/-0.039 |  20.54   \n2458952.3601 | 550 |  g  |  18.761+/-0.040 |  20.52\n2458952.3768 | 550 |  g  |  18.826+/-0.039 |  20.56\n2458952.4216 | 550 |  g  |  18.984+/-0.041 |  20.65\n2458952.1982 | 550 |  r  |  17.854+/-0.027 |  20.83     \n2458952.3356 | 550 |  r  |  17.998+/-0.036 |  20.32   \n2458952.3681 | 550 |  r  |  18.231+/-0.031 |  20.58\n2458952.3847 | 550 |  r  |  18.314+/-0.039 |  20.65\n2458952.4295 | 550 |  r  |  18.379+/-0.033 |  20.77\n------------------------------------------------------------------\n\nThe 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 (https://sites.google.com/view/growthindia/). It is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA).",
  "circularId": 27598,
  "createdOn": 1587106766000,
  "email": "varunb@iitb.ac.in",
  "subject": "GRB200412B: GROWTH India detection of afterglow",
  "submitter": "Varun Bhalerao at Indian Inst of Tech  <varunb@iitb.ac.in>",
  "eventId": "GRB 200412B"
}