{
  "bibcode": "2019GCN.23635....1C",
  "body": "IERCOO/ICSP  optical observation of GRB 190106A\n\n\nSandip K. Chakrabarti, Argha Sil, Shyam Sarkar, Ashim Sarkar, D.\nBhowmick (Indian\nCentre for Space Physics)\nWe observed GRB 190106A using 0.61m reflector of our observatory at\nSitapur, West Bengal, India. The observation was with R, V, and B filters\nin a short interval at around 16:45UT on 6th January, 2019, i.e., about\nthree hours after the BAT trigger (Sonbas et al. 2019; GCN 23615). Using\ntwo exposures each of 90s in R and in V, we obtained the magnitudes of\n17.83+/-0.25 and 18.45 +/- 0.23 respectively. Using one 90s exposure in B,\nwe obtained the magnitude of 18.81+/-0.39. Using triangulation, we obtained\nthe location of the afterglow to be RA(J2000) = 01h 59m 31.17s, Dec(J2000)\n= +23d 50m 43.94s with two pixel error 0.46s. Three sigma method was used\nto estimate the magnitudes with a calibrator J01593557 +2348527 which is of\nV mag ~12.5. After 24 hours of the BAT trigger we do not detect the\nafterglow on 7th Jan. at 13:30UT. The details of images and other results\nwill be in http:/csp.res.in.",
  "circularId": 23635,
  "createdOn": 1546877536000,
  "email": "sandipchakrabarti9@gmail.com",
  "subject": "IERCOO/ICSP optical observation of GRB 190106A",
  "submitter": "Sandip K. Chakrabarti at ICSP  <sandipchakrabarti9@gmail.com>",
  "eventId": "GRB 190106A"
}