[vsnet-grb-info 6807] GRB 081024: Faulkes Telescope North optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8402
SUBJECT: GRB 081024: Faulkes Telescope North optical observations
DATE:    08/10/24 10:56:02 GMT
FROM:    Andrea Melandri at Liverpool John Moores U  <axm at astro.livjm.ac.uk>

A. Melandri, M. Burgdorf, R.J. Smith, I.A. Steele, D.F. Bersier,
C.G. Mundell, (Liverpool JMU), A. Gomboc (Ljubljana), C. Guidorzi
(INAF-OAB) on behalf of a larger collaboration report:


On 2008 October 24 at 05:54:45 UT (~50 seconds after the GRB trigger)
we observed the field of GRB 081024 (trigger = 332516, Stratta et al.,
GCN 8938) with the robotic 2m Faulkes Telescope North located in
Hawaii.

Observations were performed on BVRi filters. We do not detect any
fadind optical source within the XRT error circle (Stratta et al.,
GCN 8938) down to the following limits:


--------------------------------------------------
  Dt_mid    T_exp     Filter      Mag_lim
   [min]    [sec]
--------------------------------------------------
   2.25      30         R         > 21.4
  112.8     600         R         > 22.6
  136.2     600         I         > 21.2
--------------------------------------------------


Limiting magnitudes has been estimated using the R2 and I magnitudes
of the USNOB-1 catalogue. The reported values are not corrected for
the Galactic extinction.