Mrk 421 flare: IceCube neutrino search
ATel #12692; Justin Vandenbroucke
on 25 Apr 2019; 19:20 UT
Credential Certification: Justin Vandenbroucke (justin.vandenbroucke@wisc.edu)
Subjects: Neutrinos, AGN, Blazar
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
IceCube has performed a search for track-like muon neutrino events arriving from the position of Mrk 421 (motivated by the TeV gamma-ray flare reported by FACT and HAWC in ATel 12680 and ATel 12683) over a time window of 16 days (2019-04-08 00:00:01 UTC to 2019-04-24 12:00:00 UTC). No muon track-like events are found in spatial coincidence with Mrk 421 during this time period, resulting in a p-value of 1.0 with respect to an atmospheric background only hypothesis. Accordingly, the time-integrated muon-neutrino flux normalization upper limit assuming an E^-2 spectrum (E^2 dN/dE) at the 90% confidence level is 7.0 x 10^-5 TeV cm^-2 for this observation period. 90% of events IceCube would detect from a source at this declination with an E^-2 spectrum are between approximately 1 TeV and 500 TeV.
The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole in Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu.
