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TITLE:   GCN CIRCULAR
NUMBER:  10159
SUBJECT: GRB 091111: a faint long GRB detected with INTEGRAL
DATE:    09/11/12 10:43:53 GMT
FROM:    Diego Gotz at CEA  <diego.gotz@cea.fr>

D. Gotz (CEA-Saclay), E.Bozzo, C. Baldovin (ISDC, Versoix), S.Mereghetti,
A.Paizis  (IASF-Milano), M. Beck, (ISDC, Versoix), C. Ferrigno
(ISDC, Versoix/IAAT, Tuebingen) and J.Borkowski (CAMK, Torun)
on behalf of the IBAS Localization Team report:

a long faint and soft gamma-ray burst has been detected by the  
INTEGRAL Burst Alert System in IBIS/ISGRI data on November 11 2009.  
Due to its faintness no automatic alert has been issued and the GRB  
has been identified through the routine off-line analysis of the low  
significance triggers. The GRB starts at 15:21:59 U.T. and lasts for  
about 100 s.

The GRB coordinates (J2000) are

R.A. : 137.8133 [degrees] ,  Dec.: -45.9093 [degrees]

with a 90% c.l. radius unercainty of 2.5 arcmin.

Even if no known X-ray source is present in the IBAS error circle, we  
note that the low galactic latitude of the object and its soft X-ray  
spectrum may indicate also a Galactic transient origin.
The light curve of the GRB will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html

This message can be cited.

[GCN OPS NOTE(12nov09):  Per author's request, CB was added
to the author list.]

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TITLE:   GCN CIRCULAR
NUMBER:  10160
SUBJECT: GRB 091111: BOOTES-3 observations
DATE:    09/11/12 14:22:09 GMT
FROM:    Javier Gorosabel at IAA-CSIC  <jgu@iaa.es>

J. Gorosabel (IAA-CSIC),  A. de Ugarte Postigo (INAF-OAB),  A.J.  
Castro-Tirado, M. Jelinek (IAA-CSIC), P. Kubanek (IPL UV, IAA-CSIC),  
R. Cunniffe, S. Guziy (IAA-CSIC), P. Yock  (Auckland Univ.), W.H.  
Allen (Vintage  Lane Obs.), I. Bond (Massey Univ.), G. Christie  
(Stardome Obs.), report on behalf of a larger collaboration, report:

"We have observed the field of the INTEGRAL GRB  091111 (Gotz et al.  
GCNC 10159) using the 0.6m Yock-Allen robotic telescope (BOOTES-3)  
located in Bleinheim, New  Zealand.  The observations were carried out  
between Nov. 12.45208 UT and 12.47379 UT, with a total exposure time  
of 88 min (starting 19.5 h after the burst).  Visual comparison with  
the DSS does not show any new source in our combined unfiltered image  
of the INTEGRAL error box down a limiting magnitude (3 sigma) of R~19.6.

Further observations are ongoing."

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TITLE:   GCN CIRCULAR
NUMBER:  10161
SUBJECT: GRB 091111: BOOTES-3 contemporaneous imaging
DATE:    09/11/12 14:53:11 GMT
FROM:    Antonio Deugarte at IAA-CSIC  <deugarte@iaa.es>

A.  de  Ugarte  Postigo (INAF-OAB), J.  Gorosabel,  A.J. Castro-Tirado,
M.  Jelinek (IAA-CSIC), P.  Kubanek (IPL UV, IAA-CSIC) and W.H. Allen
(Vintage  Lane Obs.), on behalf of a larger collaboration, report:

"During regular monitoring, the all-sky camera located at BOOTES-3
observatory in Blenheim, New Zealand observed the field of the
INTEGRAL GRB 091111 (Gotz et al. GCN 10159) before during and
after the burst onset. We have examined the images obtained at the
time of the GRB and we do not detect any new source within the
INTEGRAL error box. In the following table we give time ranges and
3-sigma limiting magnitudes of the observations that overlap with the
gamma-ray emission.

T-T0(start-->end)  Lim
=================
-31s --> +5s           9.3
+24s --> +60s        9.3
+79 --> +115s        9.3

This GCNC can be quoted."