{
  "bibcode": "2018GCN.22535....1H",
  "body": "K. E. Heintz (Univ. Iceland and DAWN/NBI), J. P. U. Fynbo (DAWN/NBI), D. \nMalesani (DAWN/NBI and DARK/NBI), report on behalf of a larger \ncollaboration:\n\nWe observed the optical counterpart of GRB 180325A (Troja et al., GCN \n22532; Guidorzi et al., GCN 22534) with the 2.5-m Nordic Optical \nTelescope (NOT) equipped with ALFOSC, starting at 02:02:30 UT on 25 \nMarch 2018. We obtained 3x100 s in the r-band and measure a magnitude of \nm(r) = 18.61 +/- 0.03 mag at a mean post-explosion epoch of 11 minutes. \nThe calibration was performed using local Pan-STARRS stars in the GRB \nfield. This apparent magnitude is not corrected for foreground extinction.\n\nWe subsequently obtained spectroscopy for a total of 3x600 s, using \ngrism #4 and covering the wavelength range 3650-9450 AA. In our \nlow-resolution spectrum we identify several absorption features, \nincluding Mg II, Fe II, Al II, C IV, Si II at a common redshift of z = \n2.25. The 2175 AA bump is clearly visible at this redshift. We also note \nthe presence of a strong intervening system at z = 2.04, as revealed by \nMg II and Fe II absorption features.\n\nFurther observations are in progress.",
  "circularId": 22535,
  "createdOn": 1521948816000,
  "email": "malesani@dark-cosmology.dk",
  "subject": "GRB 180325A: NOT redshift",
  "submitter": "Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst  <malesani@dark-cosmology.dk>",
  "eventId": "GRB 180325A"
}