{
  "bibcode": "2020GCN.28319....1R",
  "body": "B. Rothberg (LBTO/George Mason University), O. Kuhn (LBTO), C. Veillet\n(LBTO), S. Allanson (LBTO).\n\nWe observed the optical afterglow of GRB 200826A  (Gupta et al. GCN Circ.\n28288, Hurley et al., GCN Circ. 28291) using the Large Binocular Telescope\nObservatory equipped with the Multi-Object Double Spectrographs (MODS).\nOur spectra cover the wavelength range 0.38-1.0 microns. The observations\nconsist of 4 exposures of 900 seconds each in three of the four available\nchannels (MODS-1 Red, MODS-2 Blue, and MODS-2 Red).  The observation mid\ntime was 09:39 UT 28 Aug 2020.\n\nIn two 60 second acquisition images taken simultaneously wiith the g-sloan\nand r-sloan filters we measure a magnitude of g=22.96 +/- 0.07 and r=22.15\n+/- 0.07 (both ABmags). The photometry was calibrated against the DR12\ncatalog magnitudes of nearby stars (Alam et al. 2015, ApJS 219,12A). The\nacquisition images were taken at 08:52:34 and 08:54:35 UT 28 Aug 2020.\n\nThe spectroscopic observations were taken at a Position Angle = 17 degrees\nin order to cover both GRB 200826A and a possible nearby galaxy 15\" NE. The\nobservations used a 1\" wide slit and the spectra were extracted for both\nsources using a 1\" wide aperture. We clearly detect a continuum from\n0.38-0.9 microns. From the detection of multiple emission features, which\nwe interpret as [OII], [NeIII], H-gamma, H-beta, [OIII]/4959, [OIII]/5007,\nwe calculate a redshift of 0.7481 +/-0.0003.\n\nThe nearby galaxy, 15\" NE, is determined to be unrelated to GRB 200826A.\nFrom the detection of multiple emission features which we interpret as\n[OII]/5007, [NII]/6548, H-alpha, [NII]/6583, [SII]/6716, and [SII]/6730, we\ninfer a redshift of 0.1730 +/- 0.0003.\n\nAdditional spectroscopic observations are planned.\n\nWe acknowledge and heartily thank the rest of the LBTO staff for excellent\nsupport in readying the telescope for nighttime on-sky activities during\nthese chaotic times.\nB. Rothberg also acknowledges the assistance of R.T. Gatto.",
  "circularId": 28319,
  "createdOn": 1598772502000,
  "email": "brothberg@lbto.org",
  "subject": "GRB 200826A",
  "submitter": "Barry Rothberg at Large Binocular Telescope Obs  <brothberg@lbto.org>",
  "eventId": "GRB 200826A"
}