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GCN Circular 17461

GRB 150211A: ROTSE-III Upper Optical Limit
2015-02-12T22:49:20Z (9 years ago)
Farley V. Ferrante at Southern Methodist U/ROTSE <>
F. V. Ferrante (SMU), T. Guver (Istanbul U), G. Dhungana (SMU), R. Staten (SMU)

and R. Kehoe (SMU) report on behalf of the ROTSE GRB team:

The 0.45-m ROTSE-IIIb telescope, located at McDonald Observatory, Texas,

responded to GRB 150211A (Swift trigger 630714; Starling, et al.,GCN 17434) with

imaging beginning 3.8 s after the GCN notice time. An automated response recorded

the first image at 11:52:43.8 UT, 30.7 s after the burst, under fair observing conditions.

The unfiltered images are calibrated relative to USNO A2.0 (R). We do not detect an

optical source within the refined Swift-XRT error circle (Starling et al., GCN 17442).

We set the following upper limit:

start UT       end UT      t_exp(s)   mlim   t_start-tGRB(s)  Coadd?
11:52:43.8   11:53:43.8      60       17.6           30.7               N
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