TITLE:   GCN CIRCULAR
NUMBER:  22167
SUBJECT: INTEGRAL pointed follow-up of IceCube-171106A
DATE:    17/11/24 21:08:15 GMT
FROM:    Marcos Santander at U of Alabama  <jmsantander@ua.edu>

On 2017-11-06 18:39:39 UTC the IceCube detector observed an energetic neutrino event with a high probability of being astrophysical in origin (GCN 22105). The best-fit position of the neutrino provided by IceCube is RA2000 = 340.0 (-0.5/+0.5) deg and Dec2000 = 7.4 (-0.25/+0.35) deg, with uncertainties quoted at the 90% confidence level.

Pointed Target-of-Opportunity observations of the neutrino location with INTEGRAL were obtained between 2017-11-16 19:07 UTC and 2017-11-17 08:28 UTC for a total observation time of 45 ks. A preliminary analysis of the data did not reveal any new sources in the combined ISGRI or JEM-X mosaics. The typical 3-sigma sensitivity reached for the position of IceCube-171106A was 1.9 mCrab (2.9e-11 erg/cm2/s) in JEM-X 3-10 keV mosaic and 3.5 mCrab (2.7e-11 erg/cm2/s) in 20-40 keV ISGRI mosaic. INTEGRAL observations of the neutrino position at the time of the trigger were reported in GCN 22109. 

We thank the INTEGRAL Science Operations Centre (ESA/ESAC, Madrid, Spain) and the Mission Operations Centre (ESA/ESOC, Darmstadt, Germany) for their prompt scheduling of these observations.

M. Santander (University of Alabama, US) 
V. Savchenko (ISDC, University of Geneva, CH)
A. Keivani (Dept. of Physics, Penn State University, US)
E. Gotthelf (Columbia University, US)
C. Ferrigno (ISDC, University of Geneva, CH),
P. Ubertini, A. Bazzano, L. Natalucci (INAF IAPS-Roma, Italy),
S. Mereghetti (INAF IASF-Milano, Italy),
P. Laurent (CEA, Saclay, France), E. Kuulkers (ESTEC/ESA, The Netherlands)