TITLE:   GCN CIRCULAR
NUMBER:  15862
SUBJECT: GRB 140213A: Continued Skynet R-COP/PROMPT Observations of the Optical Afterglow
DATE:    14/02/19 16:39:45 GMT
FROM:    Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet  <atrotter@physics.unc.edu>

A. Trotter, J. Haislip, D. Reichart, A. LaCluyze, A. Verveer, T. Spuck, 
A. Foster, N. Frank, K. Ivarsen, J. Moore, M. Nysewander, R. Beauchemin, 
T. Berger, M. Carroll, H. T. Cromartie, R. Egger, M. Hinckle, A. 
Ireland, M. Maples, L. Scott, and J. A. Crain report:

Skynet continued observing the Swift-BAT localization of GRB 140213A 
(Holland et al., GCN 15825, Swift trigger 586569) with the 14-inch R-COP 
telescope at Perth Observatory, Australia, and with four 16-inch 
telescopes of the PROMPT array at CTIO, Chile.  Previous observations 
with R-COP began at 59s and continued until 92m post-trigger (Trotter et 
al., GCN 15828). Observations resumed with PROMPT-CTIO at t=5.5h, and 
continued at R-COP and PROMPT-CTIO until t=32h, during which time the 
afterglow rebrightened (Trotter et al., GCN 15859).

R-COP and PROMPT-CTIO took a total of 284x160s exposures in BVRI between 
t~5-5.3d. In stacked images, we continue to detect an uncatalogued 
optical source in R and I bands at the position of the source detected 
by the Swift UVOT (Siegel & Holland, GCN 15826). After the rebrightening 
at t~1d, the source clearly resumed fading.

Band      tmid       mag
I         5.3d       20.7 (+/-0.2)
R         5.2d       21.3 (+/-0.3)
V         5.3d      >21.7
B         5.3d      >21.6

An updated light curve is at:
http://www.skynet.unc.edu/grb/grb140213a_3.png

Magnitudes are in the Vega system, calibrated to ten APASS-DR7 stars in 
the field, and have not been corrected for the Galactic foreground 
extinction corresponding to E(B-V)=0.07 (Schlegel et al. 1998).

No further Skynet observations are scheduled.