[AAVSO-HEN] GRB 090814B: Liverpool Telescope Observations

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  9806
SUBJECT: GRB 090814B: Liverpool Telescope Observations
DATE:    09/08/14 16:28:54 GMT
FROM:    Zach Cano at ARI/John Moores Liverpool  <zec at astro.livjm.ac.uk>

C. Guidorzi (U. Ferrara), Z. Cano (Liverpool JMU), A. Gomboc
(U. Ljubljana), C.G. Mundell, I.A. Steele, A. Melandri, S. Kobayashi,
C.J. Mottram, D.F. Bersier, R.J. Smith (Liverpool JMU)
report on behalf of a large collaboration:

On 2009 August 14 at 02:57:31 UT the 2-m Liverpool Telescope
automatically began observing the INTEGRAL GRB 090814B (Beckmann et al.,
GCN Circ. 9795) using the g',r' and i' filters.

We do not detect any uncatalogued source inside the Swift-XRT error
circle (Evans et al. GCN Circ 9803) down to the following values:

Mid Time   Delay from GRB   Total Exp  Filter   Upper limit
(UT)       (hours)          (s)                 Magnitude
-----------------------------------------------------------
03:26:17    2.08            600         R         > 21.3
03:27:52    2.11            540         I         > 21.0
---------------------------------------------------------

Magnitudes have been calibrated from the nearby USNOB-1 star
04:19:01.476, +60:35:18.11 using R2=18.34 and I=17.14.

We note the considerable Galactic reddening along the GRB
direction: E(B-V)=1.14 (Schlegel et al. 1998).