[AAVSO-HEN] GRB090715B: WHT redshift

[grb at aavso.org]

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TITLE:   GCN CIRCULAR
NUMBER:  9673
SUBJECT: GRB090715B: WHT redshift
DATE:    09/07/16 05:19:03 GMT
FROM:    Klaas Wiersema at U of Leicester  <kw113 at star.le.ac.uk>

K. Wiersema (Leicester), A. Levan (Warwick), A. Kamble (Amsterdam), N. 
Tanvir (Leicester) and D. Malesani (DARK/NBI) report on behalf of a larger 
collaboration:

We observed the afterglow of GRB090715B (Vetere et al, GCN 9668; Smith et 
al GCN9 670) with the William Herschel Telescope, using the ISIS 
spectrograph. Exposure times were 3 x 900 seconds with the R300B and R316R 
grisms in the blue and red arm respectively, starting at 23:46 UT. We 
detect a multitude of lines, including Lyman alpha, Lyman beta, SiII and 
SII at redshift z=3.00.

We thank T. Ottosen for acquiring this dataset.