Skip to main content
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 10682

GRB 100424A: Gemini/NIRI Candidate Afterglow
2010-04-25T09:47:55Z (14 years ago)
S. Bradley Cenko at Caltech <>
S. B. Cenko, J. S. Bloom, A. N. Morgan, and B. E. Cobb (UC Berkeley)
report on behalf of a larger collaboration:

We have imaged the field of GRB 100424A (Hoversten et al., GCN 10667) with
the Near-InfraRed Imager and Spectrometer mounted on the 8 m Gemini North
telescope.  Observations were taken in the J and K filters beginning at
6:28 UT on 25 April 2010 (~ 14 hours after the burst).

At the edge of the refined XRT error circle (Evans et al., GCN 10669) we
identify a faint point source in both filters.  Referencing both the
astrometry and photometry to the 2MASS source 13574681+0131477, we
measure a position (J2000.0) of

	RA: 13:57:47.43		Dec: +01:32:18.9

and approximate magnitudes of K = 19.9, J = 22.1 (both Vega magnitudes).
The J-K color indicates a red afterglow, though does not necessarily
require a high-redshift origin (e.g., Levan et al., GCN 10672).  No
other objects are detected inside the XRT error circle.

Without evidence for variability, we cannot definitively confirm if this
source is the afterglow of GRB 100424A.  Further observations are planned
to search for fading.

We wish to thank the staff at Gemini Observatory, in particular Kristin
Chiboucas, for promptly executing these observations.
Looking for U.S. government information and services? Visit