[vsnet-grb-info 13280] GRB 130427A: host galaxy observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14617
SUBJECT: GRB 130427A: host galaxy observations
DATE:    13/05/09 20:03:02 GMT
FROM:    Klaas Wiersema at U Leicester  <kw113 at leicester.ac.uk>

K. Wiersema (U. of Leicester), O. Vaduvescu (ING), N. Tanvir (U. of Leicester), 
A. Levan (Warwick) and O. Hartoog (U. of Amsterdam) report:

We observed the position of GRB 130427A with the 4.2m William Herschel telescope,
using the PFIP camera, on April 8th, under good seeing conditions (0.7 arcseconds). 
Exposures of 4x600 seconds were obtained using a narrowband filter covering 
the [O II] emission line doublet (3728 A) at the redshift of the 
GRB (z=0.3399; Levan et al., Xu et al. and Flores et al.; GCN 14455, 14478, 14491).
We used this filter to obtain the best visibility of the host galaxy against the bright afterglow
and possible supernova contribution.
The resulting data show a clear detection of the host galaxy. The GRB is located near, but
somewhat offset from, a brighter patch in the host. The host is an irregular galaxy, with
a broadly elliptical shape. The GRB is located North-West of the
majority of extended, smooth, host emission - a convenient choice in spectrograph slit
position angle may minimize host contamination and aid in identification of SN signatures.
The long axis of the host is approximately oriented along 70 degrees position angle (where
North=0, East = 90 degrees), and is approximately 3.4 arcseconds in length.

A jpg finder chart of the [OII] imaging can be found here:
http://www.star.le.ac.uk/~kw113/grb130427A/hostgalaxy_130427a.jpg