TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1131
SUBJECT: GRB010921, optical observation
DATE:    01/11/06 21:35:41 GMT
FROM:    Hye-Sook Park at LLNL  <hpark@llnl.gov>

H.S. Park, G. Williams, S. Barthelmy, T. Cline, D. Hartmann, 
K. Hurley, W. Pereira
report on behalf of the LOTIS collaboration:

Super-LOTIS observed the HETE/IPN error box of GRB 010921
(GCNC #1096, #1097) on 09/22/2001 starting at 03:05 UTC, 
21.8 hr after the burst. Super-LOTIS is a 0.6 m telescope 
located at Kitt Peak. These observations were made with a 
clear filter and an effective integration time is 1000 s. 
We detect the afterglow reported by Price et al. (GCNC #1107) 
at 2 epochs. The magnitude of the afterglow is calibrated 
against R band secondary standards reported in GCNC #1100 
by Henden.

	UTC		Ropen
	9/22/01 03:05	19.4 +/- 0.2
	9/22/01 06:25	19.9 +/- 0.2
	9/23/01 03:05	> 21.2 +/- 0.3
	9/23/01 06:27	> 21.2 +/- 0.3

Further analysis is in progress.

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