{
  "bibcode": "2022GCN.32896....1K",
  "body": "T. Komesh (NU), B. Grossan (UCB, NU), Z. Maksut (NU), M. Krugov (FAI), \nreport on behalf of the Energetic Cosmos Laboratory: The Nazarbayev \nUniversity Transient Telescope at Assy-Turgen Astrophysical Observatory \n(NUTTelA-TAO) observed the field of GRB 221028A on receipt of an \nautomated GCN / BAT position alert, observing in Sloan g', r' and i' \nbands, with the Burst Simultaneous Three-Channel Imager (BSTI; Grossan, \nKumar & Smoot 2019, JHEA, 32, 14).We started observations at UT \n2022-10-28 13:47:19, 1852 s after the BAT trigger. Observations were \nmade under partially cloudy conditions, beginning with the target at an \naltitude of 82 deg. No new or changing sources consistent with the XRT \nposition (Lien 2022, GCN 32874) were detected. Note that these \nobservations provide essentially full-time coverage, simultaneous in all \nthree bands. We report the following results: start time t-t0(s) end \ntime UL g' UL r' ULi' exposure_time (s) ------------ -------- \n----------- ------ ------ ----- ------ 13:47:19 1852 13:48:19 19.3 18.9 \n18.7 60 13:48:19 1912 13:58:19 20.3 19.4 20.0 600 start time is in UT. \nt-t0(s) gives the time since trigger, in seconds. UL gives the 5 sigma \nupper limit sensitivity in magnitudes for an image withindividual \nexposure time (first row) and for images co-added to the given exposure \ntime (second row).��The given upper limit values are derived from the \naverage calibration with only 2-4 standard stars per co-added frame, and \nno other analysis or corrections. ---------------------------------- NU \n= Nazarbayev University, Nur-Sultan, Kazakhstan UCB = University of \nCalifornia, Berkeley, USA FAI = Fesenkov Astrophysical Institute, \nKazakhstan This research has been funded by the Science Committee of the \nMinistry of Science and Higher Education of the Republic of Kazakhstan \n(Grant No. AP14870504). The NUTTelA-TAO Team acknowledges the support of \nthe staff of the Assy-Turgen Astrophysical Observatory, Almaty, \nKazakhstan, and the Fesenkov Astrophysical Institute, Almaty, Kazkhstan.",
  "circularId": 32896,
  "createdOn": 1667183710000,
  "email": "toktarkhan.komesh@nu.edu.kz",
  "subject": "GRB 221028A: NUTTelA-TAO / BSTI Early Optical Limits",
  "submitter": "Toktarkhan Komesh at Nazarbayev University  <toktarkhan.komesh@nu.edu.kz>",
  "eventId": "GRB 221028A"
}