Difference: GCNCIRCULAR21508 ( vs. 1)

Revision 12017-08-18 - ThomasKupfer

Line: 1 to 1

Added:

>
>

META TOPICPARENT	name="LVCGCNs"

TITLE: GCN CIRCULAR
NUMBER: 21508
SUBJECT: LIGO/Virgo G298048: FOUND COINCIDENT IceCube neutrino observation
DATE: 17/08/17 14:05:11 GMT
FROM: Stefan Countryman at LIGO Scientific Collaboration <stefan.countryman@ligo.org>

I. Bartos, S. Countryman (Columbia), C. Finley (U Stockholm), E. Blaufuss (U Maryland), R. Corley, Z. Marka, S. Marka (Columbia) on behalf of the IceCube Collaboration

The analysis FOUND A COINCIDENT ONLINE TRACK-LIKE NEUTRINO CANDIDATE detected by IceCube within the 500 second window surrounding G298048 within the BAYESTAR skymap. The coordinates of the reconstructed neutrino source are below:

# dt[s] RA[deg] Dec[deg] E[TeV] Sigma[deg]

1. -166.00 291.4 69.0 0.37 3.1

We searched IceCube online track-like neutrino candidates (GFU) detected in a [-500,500] second interval about the LIGO-Virgo trigger G298048. We compared the candidate source directions of 6 temporally-coincident neutrinos to the BAYESTAR skymap, with the following parameters:

# dt[s] RA[deg] Dec[deg] E[TeV] Sigma[deg]

1. -419.79 226.7 12.0 0.65 1.8
2. -266.61 239.6 19.6 1.04 1.6
3. -165.72 291.3 68.8 0.37 3.1
4. -153.47 182.0 -3.2 0.88 0.9
5. 310.59 1.4 23.8 0.50 1.5
6. 390.94 203.2 6.0 1.00 0.7

(dt--time from GW in [seconds]; RA/Dec--sky location in [degrees]; E--reconstructed secondary muon energy in [TeV]; Sigma--uncertainty of direction reconstruction in [degrees])

A coincident neutrino-GW skymap has been posted to GraceDB (<https://gracedb.ligo.org/apiweb/events/G298048/files/coinc_skymap_initial_icecube.png,0>). A JSON-formatted list of the above neutrinos can be downloaded from GraceDB at: <https://gracedb.ligo.org/apiweb/events/G298048/files/IceCubeNeutrinoList.json,0>

In addition, we are performing coincident searches with other IceCube data streams, including the high-energy starting events (HESE) and Supernova triggers. HESE events have typical energies > 60 TeV and start inside the detector volume, leading to a relatively pure event sample with a high fraction of astrophysical neutrinos. The SN trigger system is sensitive to sudden increases in photomultiplier counts across the detector, which could indicate a burst of MeV neutrinos. We will submit separate GCN circulars if coincident HESE or SN triggers are found.

The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. For a description of the IceCube realtime alert system, please refer to <http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1610.01814>; for more information on joint neutrino and gravitational wave searches, please refer to <http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1602.05411>.

-- ThomasKupfer - 18 Aug 2017

View topic | History: r1 | More topic actions...