[vsnet-grb-info 17805] GRB 160327A: Early RAPTOR Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19247
SUBJECT: GRB 160327A:  Early RAPTOR Limits
DATE:    16/03/29 22:58:53 GMT
FROM:    James Wren at LANL  <jwren at lanl.gov>

J. Wren, W.T. Vestrand, P. Wozniak, and H. Davis,

of Los Alamos National Laboratory report:


The RAPTOR network of robotic optical telescops made observations of Swift

trigger 680655 (Racusin, et al., GCN 19235).  Our Raptor-S telescope began

imaging at 09:16:27.58 UT, 19.9 s after the Swift trigger time.  We do not

detect the optical counterpart reported by RATIR (Golkhou, et al., GCN 19236).

We derive the following 3-sigma limits for our unfiltered observations based

on comparison to the USNO-B1.0 catalog R-band.


t-mid(s)   exp(s)    mag_limit

-------------------------------

32.5       5         17.4

67.8       40        18.6

131.8      10        18.0

180.4      100       19.2

249.9      200       19.6