{
  "bibcode": "2018GCN.22362....1C",
  "body": "V. Cunningham, J. D. Neill, S. B. Cenko, and R. Walters report on\nbehalf of the SEDM team:\n\nWe obtained a spectrum of the optical afterglow of GRB181105A\n(Cannizzo et al., GCN 22335; Cano et al., GCN 22345; de Ugarte\nPostigo et al., GCN 22346; Marshall et al., GCN 22357) with the\nSpectral Energy Distribution Machine (SEDM) on the 60 inch\ntelescope at Palomar Observatory.  The SEDM is a low resolution\n(R ~ 100) integral field unit spectrometer with a multi-band (ugri)\n���rainbow��� camera imager (see Blagorodnova et al., 2017,\nastro-ph/1710.02917).\n\nObservations began at 4:30 UTC on January 15 (14 minutes after\nthe Swift BAT trigger) and covered the wavelength range from\n3800-9200 A with an exposure time of 2700 s.  Continuum emission\nis clearly seen at wavelengths redder than 4500 A and is well fit by\na relatively steep power-law spectrum with index alpha = 1.93\n(f_nu ~ nu^-alpha).  No obvious emission or absorption features are\nclearly detected in the spectrum; due to the low SNR at wavelengths\nshorter than 4500 A we cannot confirm the detection of Ly-alpha at\nz = 2.487 reported by de Ugarte Postigo et al. (GCN 22346).\n\n[GCN OPS NOTE(07sep19): Per author's request, in the last paragraph\nthe \"alpha = 1.93\" was changed to \"alpha = 0.93\".]",
  "circularId": 22362,
  "createdOn": 1516306912000,
  "email": "vcunning@astro.umd.edu",
  "subject": "GRB 180115A: SEDM Observations",
  "submitter": "Virginia Cunningham at U of MD  <vcunning@astro.umd.edu>",
  "eventId": "GRB 180115A"
}