{
  "bibcode": "2021GCN.30290....1C",
  "body": "V. Cunningham (U of Maryland), J. D. Neill (Caltech), S. B. Cenko\n(NASA GSFC), and R. Walters (Caltech) report on behalf of the SEDM\nteam:\n\nWe observed the optical counterpart to GRB 210619B (D'Avanzo et al.,\nGCN 30261) with the Spectral Energy Distribution Machine (SEDM) on\nthe 60 inch telescope at Palomar Observatory. The SEDM is a low\nresolution (R ~ 100) integral field unit spectrometer with a multi-band\n(ugri) rainbow camera imager (see Blagorodnova et al. 2018, PASP,\n130, 035003, and Rigault et al. 2019, A&A, 627, A115). The SEDM\nbegan observing the optical counterpart at 06:37:52 UTC (6.5 hours\nafter the burst trigger time). We performed a 2880 s exposure over the\nwavelength range 3800-9200 A.\n\nThe continuum emission is well-fit by a power law spectrum with index\nalpha = 2.8 (f_nu ~ nu^-alpha). The noise level of the spectrum,\nespecially at wavelengths bluer than 5000 A, make it difficult to confirm\nthe redshift reported by OSIRIS/GTC (GCN 30272).\n\n[GCN OPS NOTE(22jun21):  Per author's request, the error in the sentence:\n\"The SEDM began observing the optical counterpart at 00:01:33 UTC\n(1.5 hours after the burst trigger time)\" and should be replaced with:\n\"The SEDM began observing the optical counterpart at 06:37:52 UTC\n(6.5 hours after the burst trigger time)\".]",
  "circularId": 30290,
  "createdOn": 1624281819000,
  "email": "vcunning@umd.edu",
  "subject": "GRB 210619B: SEDM Optical Observations",
  "submitter": "Virginia Cunningham at U of MD  <vcunning@umd.edu>",
  "eventId": "GRB 210619B"
}