GCN Circular 13245
Subject
GRB 120422A: Gemini observations
Date
2012-04-22T10:44:59Z (13 years ago)
From
Antonino Cucchiara at UCSC/UCO Lick <acucchia@ucolick.org>
A. Cucchiara (UCSC/UCO Lick), A. Levan (U Warwick), D. B. Fox (PennState),
N. R. Tanvir (U. Leicester) report on behalf of a larger collaboration reports:
On April 22.33 UT (~50 minutes after the BAT trigger) we observed the field
of GRB 120422A (Troja et al., GCN 13243) using GMOS Spectrograph on
the Gemini-North 8-m telescope.
In our acquisition image of 240s in i' band an optical candidate was identified at:
RA: 09:07:38.38
Dec: +14:01:07.5
with an uncertainty of 0.3" in each direction.
Using three SDSS stars in the field we estimate a magnitude of
i'=19.03 +- 0.15
We also noticed just outside the XRT error circle the presence of
the SDSS (DR8) galaxy SDSS J090738.51+140108.3.
A subsequent spectrum of 2x900s, covering the wavelength range 6000-10000
does not present evident absorption features.
If the SDSS galaxy is associated with GRB 120422A then its brightness would
suggest a moderately low redshift (z<1).
Further analysis is in progress.
We thank the Gemini-North staff for their prompt support.