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GCN Circular 8601

GRB081203A: Swift/UVOT grism redshift
2008-12-03T19:36:15Z (15 years ago)
Wayne Landsman at GSFC/SSAI <>
W. Landsman (NASA/GSFC), M.  DePasquale(MSSL),  P. Kuin (MSSL),   P. 
Schady (MSSL),  P. Smith (MSSL), and A.Parsons (NASA/GSFC) report 
on behalf of the  Swift/UVOT team:

The Swift/UVOT obtained a 49s  UV grism spectrum of GRB 081203A starting 
249 s after the  BAT trigger (Parsons et al. GCN.8595).     The  
spectrum covers the wavelength range from 2000-4900 A.      Longward of  
2850 A in the 
quicklook spectrum there is an approximately flat  continuum  of  
2.5e-14 erg s-1 cm-2 A-1 with a strong absorption at 3850 A.  If the 
2850 A cutoff is identified with the Lyman edge, and the 3850 A  
absorption with Lyman alpha, then the redshift of  GRB081203A is 
~2.1.    Analysis is continuing.
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