[vsnet-grb-info 2721] GRB 060121: optical observations

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4558
SUBJECT: GRB 060121: optical observations
DATE:    06/01/22 09:03:37 GMT
FROM:    Grant Williams at Steward Observatory  <ggwilli at mmto.org>

G. G. Williams, E. Olszewski, and P. A. Milne (Steward Observatory) 
report:

We observed the HETE-SXC error region of the short/hard GRB 060121 
(Arimoto et al., GCN 4550, Prigozhin et al., GCN 4551, Boer et al., GCN 
4552) with the 90prime imager on the Steward Observatory 90-inch Bok 
telescope at Kitt Peak.  We obtained two sets of summed images in Rc, each 
with a total exposure time of 1800 seconds, beginning at 04:02:45 UT (5.6 
hours after the GRB) and at 05:40:29 UT.  Visual comparison of these 
images reveals no significantly variable sources to approximately 1.0 
magnitudes deeper than the SDSS r' image (Cool et al., GCN 4554).

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