Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 7874

GRB 080514B: Spectroscopic constraints and probable host galaxy
2008-06-13T16:18:12Z (16 years ago)
Daniel Perley at U.C. Berkeley <>
D. A. Perley, J. S. Bloom (UC Berkeley), H.-W. Chen (U Chicago), R. J. 
Foley, A. A. Miller, J. Shiode, J. Brewer, D. Starr, and R. Kennedy 
(UCB) report:

On the night of 2008-06-07 (UT) we observed the location of the 
Super-AGILE burst GRB 080514B (GCN 7715, Rapisarda et al.) with Keck I / 
LRIS in g and R filters for 1080s and 960s respectively, starting at 
12:53 UT.  We detect a source consistent with the afterglow position (de 
Ugarte Postigo et al., GCN 7719) in both filters.  Photometry within a 
1.1" radius aperture gives an magnitude (calibrated to three nearby USNO 
B1.0 stars) of:

R = 23.9 +/- 0.2 (t = 24.1 days)

Compared to the measurement of Malesani et al. (R = 22.52 at 1.77 days, 
GCN 7734), this would suggest a decay index of only about alpha = 0.5 
were this the GRB afterglow, which is unlikely at such late times.  More 
likely, the source represents a relatively bright host galaxy of this burst.

However, analysis of a 2x1200s Gemini-North spectrum using GMOS taken at 
the afterglow location (offset <0.5" from the host from a comparison 
from the Gemini i-band acquisition image) 1.9 days after the GRB shows 
no significant emission or absorption features over the usable spectral 
range from 4000-6720 Angstroms.  The continuum flux extends all the way 
to 4000 Angstroms without evidence of Lyman-alpha forest absorption, 
which imposes a redshift constraint of z < 2.3.  Further follow-up is 

A colorized image of the field is available at:
Looking for U.S. government information and services? Visit