GCN Circular 4523

Subject

GRB 060116: ROTSE-III Optical Limits

Event

Date

2006-01-16T15:12:28Z (20 years ago)

From

Eli Rykoff at U of Michigan/ROTSE <erykoff@umich.edu>

E.S. Rykoff (U Mich), S.A. Yost (U Mich), H. Swan (U Mich), report on 
behalf of the ROTSE collaboration:

ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 
060116 (Swift trigger 177533, Campana, et al, GCN 4519Loading...
 
 ), producing 
images beginning 9.0 s after the GCN notice time. An automated response 
took the first image at 08:38:46.0 UT, 78.8 s after the burst, under 
fair conditions. We took 10 5-sec, 10 20-sec and 70 60-sec eposures. 
These unfiltered images are calibrated relative to USNO A2.0 (R).

Comparison to the DSS (second epoch) reveals no new sources within the 
3-sigma BAT error circle, or in the XRT error circle (Campana, et al, 
GCN 4522Loading...
 
 ) for both single images and coadding into sets of 10. 
Individual images have limiting magnitudes ranging from 15.6-16.9; we 
set the following specific limits.

start UT       end UT      t_exp(s)   mlim   t_start-tGRB(s)  Coadd?
--------------------------------------------------------------------
08:38:46.0   08:38:51.0         5     16.1           78.8       N
08:38:46.0   08:39:55.0        69     17.7           78.8       Y
08:40:07.6   08:44:50.7       283     18.0          160.4       Y