IceCube-200109A
GCN Circular 26696
Subject
IceCube-200109A: IceCube observation of a high-energy neutrino candidate event
Date
2020-01-10T01:14:56Z (5 years ago)
From
Robert Stein at DESY <robert.stein@desy.de>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 20/01/09 at 23:41:39.94 UT IceCube detected a track-like event with a high probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_Gold alert stream. The average astrophysical neutrino purity for Gold alerts is 50%. This alert has an estimated false alarm rate of 0.64 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection.
After the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/133609_37927131.amon <https://gcn.gsfc.nasa.gov/notices_amon_g_b/133609_37927131.amon>), more
sophisticated reconstruction algorithms have been applied offline, with the direction refined to:
Date: 20/01/09
Time: 23:41:39.94 UT
RA: 164.49 (+4.94 -4.19 deg 90% PSF containment) J2000
Dec: 11.87 (+1.16 -1.36 deg 90% PSF containment) J2000
Due to the unique topology of this event, with a partially-contained track in the detector, it was challenging for online algorithms to reconstruct. The initially-reported direction was offset from this updated best-fit position by approximately 3 degrees.
We encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino.
There is one Fermi 4FGL source within the 90% localization region, 4FGL J1103.0+1157 at RA: 165.77 deg, Dec: 11.97 deg (1.26 deg away from the best-fit event position). This source, which is associated with the quasar TXS 1100+122 at z=0.91, is also found in the 3FHL catalog.
The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu
GCN Circular 26697
Subject
IceCube-200109A: Upper limits from Fermi-GBM Observations
Date
2020-01-10T04:44:32Z (5 years ago)
From
Joshua Wood at MSFC/Fermi-GBM <joshua.r.wood@nasa.gov>
J. Wood (NASA/MSFC) reports on behalf of the Fermi-GBM team:
For the IceCube high-energy neutrino candidate event 200109A (GCN 26696), at the event time Fermi-GBM was observing the reported neutrino location at:
RA: 164.49 (+4.94 -4.19 deg 90% PSF containment) J2000
Dec: 11.87 (+1.16 -1.36 deg 90% PSF containment) J2000
There was no Fermi-GBM onboard trigger around the event time of the neutrino candidate. An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around the neutrino candidate time. From this search, no significant signal was found related to IceCube-200109A.
We set upper limits on impulsive gamma-ray emission. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set the following 3 sigma flux upper limits over 10-1000 keV (in units of 10^-7 erg/s/cm^2):
Timescale Soft Normal Hard
-------------------------------------------
0.128 s: 7.3 11. 16.
1.024 s: 2.1 2.8 3.6
8.192 s: 0.4 0.6 1.2
GCN Circular 26698
Subject
IceCube-200109A: INTEGRAL was inactive at the time of the event
Date
2020-01-10T08:48:10Z (5 years ago)
From
Carlo Ferrigno at IAAT/ISDC <carlo.Ferrigno@unige.ch>
Alexis Coleiro (APC, France), Carlo Ferrigno,
V. Savchenko (ISDC/UniGE, Switzerland),
S. Mereghetti (INAF IASF-Milano, Italy),
J. Rodi (IAPS-Roma, Italy),
on behalf of the INTEGRAL multi-messenger collaboration:
https://www.astro.unige.ch/cdci/integral-multimessenger-collaboration
<https://slack-redir.net/link?url=https%3A%2F%2Fwww.astro.unige.ch%2Fcdci%2Fintegral-multimessenger-collaboration&v=3>
The INTEGRAL spacecraft has a highly elliptical orbit and the
instruments are not acquiring science data during perigee passage,
every 2.6 days to prevent radiation-induced damages. Unfortunately, at
the time of IceCube-200109A (2020-01-09 23:41:39) the spacecraft was
preparing to the start the observations after the perigee passage
between the orbits number 2181 and 2182. Therefore,
no scientific data are available between 2020-01-09 16:27 and
2020-01-10 01:48.
GCN Circular 26700
Subject
IceCube-200109A: Swift-XRT and UVoT Follow-up Observations
Date
2020-01-10T22:39:51Z (5 years ago)
From
Azadeh Keivani at Columbia U <azadeh.keivani@columbia.edu>
IceCube-200109A: Swift-XRT and UVoT Follow-up Observations
P. A. Evans (U. Leicester), A. Keivani (Columbia U.), J. A. Kennea (PSU),
F. E. Marshall (NASA/GSFC), and D. B. Fox (PSU), report:
The Neil Gehrels Swift Observatory observed the field of the IceCube
Astrotrack Gold astrophysical neutrino candidate event IceCube-200109A
(revision 1, https://gcn.gsfc.nasa.gov/gcn3/26696.gcn3) beginning Jan 10,
05:55:10 UT (~6 hours after the neutrino arrival time).
Swift utilized a 35-point tiling pattern to cover a region centered on
R.A., Dec. (J2000) = 164.49d, 11.87d, with a radius of approximately 66
arcmin; estimated 90%-containment error region for this event is rather
large with asymmetric (+4.94d, -4.19d) on RA and (+1.16, -1.36) on Dec.
Swift-XRT collected ~230 s per field of PC-mode data per tile (except for
one tile which only 8 s were obtained). The X-ray data have been reduced
using the analysis approach and software routines of Evans et al. 2014
(ApJS, 210, 8).
Only one X-ray source (RA = 165.34231 deg, Dec = 12.58648 deg) is detected
in the field of observation, which is consistent with a double or multiple
star (HEI 155; 1.5 arcsec away) which is also 18.8 arcsec away from a known
X-ray source 1RXS J110123.1+123524 from ROSAT/RASSFSC. This is not
considered as a source of interest.
Excluding the identified source, the 3-sigma upper limit on the count rate
of any point-like counterpart over the rest of the tiled region is 0.03 ct
s^-1, which corresponds to a 0.3-10 keV flux of 1.2e-12 erg cm^-2 s^-1 for
a typical AGN spectrum (nH=3e20 cm^-2, Gamma=1.7).
Swift/UVOT co-observed with XRT (with a slightly smaller field-of-view)
using the U filter. The exposures are ~219 s except for one tile (target ID
00013102), for which only 8 s were obtained. No uncatalogued sources were
found with a limiting magnitude of about 18.9 for the typical field and
17.5 for target ID 00013102.
GCN Circular 26707
Subject
IceCube-200109A: Upper limits from a search for additional neutrino events in IceCube
Date
2020-01-11T16:09:51Z (5 years ago)
From
Alex Pizzuto at ICECUBE/U of Wisconsin <pizzuto@wisc.edu>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
IceCube has performed a search for additional track-like muon neutrino events arriving
from the direction of IceCube-200109A (https://gcn.gsfc.nasa.gov/gcn3/26696.gcn3) in a time
range of 2 days centered on the alert event time (2020-01-08 23:41:39.94 UTC to 2020-01-10 23:41:39.94 UTC) during which IceCube was collecting good quality data. Excluding the
event that prompted the alert, zero additional track-like events are found in spatial coincidence
with the 90% containment region of IceCube-200109A. We accordingly derive a time-integrated muon-neutrino flux upper limit at the alert position of E^2 dN/ dE = 4.12 x 10^-5 TeV cm^-2 at 90% CL, under the assumption of an E^-2 power law. 90% of events IceCube would detect from a source at this declination with an E^-2 spectrum are approximately between 1 TeV and 1 PeV.
A subsequent search was performed to include the month of data prior to the alert event (2019-12-10 23:41:39.94 UTC to 2020-01-10 23:41:39.94 UTC). In this case, we report a p-value of 1.0, consistent with no significant excess of track-like events, and a corresponding time-integrated muon-neutrino flux upper limit assuming an E^-2 spectrum (E^2 dN/dE) of
9.39 x 10^-4 TeV cm^-2 at the 90% CL.
The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu<mailto:roc@icecube.wisc.edu>.
GCN Circular 26709
Subject
IceCube 200109A: No significant detection in HAWC
Date
2020-01-11T17:53:53Z (5 years ago)
From
Hugo Ayala at Pennsylvania State University <hgayala@psu.edu>
Hugo Ayala (PSU) reports on behalf of the HAWC
collaboration (http://www.hawc-observatory.org/collaboration):On
2020/01/09 23:41:39 UTC, the IceCube collaboration reported a
track-like very-high-energy event that has a high probability of
being an astrophysical neutrino, IceCube-200109A. Location is at
RA: 164.49 (+4.94/-41.9 90% PSF containment) J2000
Dec: 11.87 (+1.16/-1.36 deg 90% PSF containment) J2000
https://gcn.gsfc.nasa.gov/gcn3/26696.gcn3
(GCN circular 26696).
We performed two types of analyses for the follow-up. The first is for
a steady source in archival data and the second is a search for a
transient source. We assume a power-law spectrum with an index of -2.3
for both analyses.
Search for a steady source in archival data:
The archival data spans from November 2014 to November 2019.
We searched inside the IceCube error region from the circular.
The highest significance, 2.77 sigma (0.89 post-trials),
is at RA 167.39 deg, Dec 11.03 deg (+-1.78 deg 68% containment) J2000.
We set a time-integrated 95% CL upper limit on gamma rays at the
maximum position of:
E^2 dN/dE = 3.02e-13 (E/TeV)^-0.3 TeV cm^-2 s^-1
Search for a transient source.
Since the IceCube event fall inside the HAWC field of view,
we report on the result for the current transit of the IceCube
position.Data acquisition started on Data Start: 2020/01/08 13:01:36
UTC and ended
2020/01/10 13:29:43 UTC.
The most significant location, with 2.40 sigma (-1.76 post-trials),
is at RA 164.0 deg, Dec 11.15 deg (+-1.8 deg 68% containment) J2000.
We set a time-integrated 95% CL upper limit at the position of
maximum significance of:
E^2 dN/dE = 1.12e-11 (E/1TeV)^-0.3 TeV cm^-2 s^-1
HAWC is a very-high-energy gamma-ray observatory operating in Central
Mexico at latitude 19 deg. north. Operating day and night with over
95% duty cycle, HAWC has an instantaneous field of view of 2 sr and
surveys 2/3 of the sky every day. It is sensitive to gamma rays from
300 GeV to 100 TeV.
GCN Circular 26728
Subject
Fermi-LAT Gamma-ray Observations of IceCube-200109A and detection of a possible new gamma-ray source, Fermi J1055.8+1034
Date
2020-01-13T09:54:53Z (5 years ago)
From
Simone Garrappa at DESY <simone.garrappa@desy.de>
S. Garrappa (DESY-Zeuthen), S. Buson (Univ. of Wuerzburg) and V. Paliya
(DESY-Zeuthen)�on behalf of the Fermi-LAT collaboration:
We report an analysis of observations of the vicinity of the high-energy
IC200109A neutrino event (GCN 26696) with all-sky survey data from the
Large Area Telescope (LAT), on board the Fermi Gamma-ray Space
Telescope. The IceCube event was detected on 2020-01-09 at 23:41:39.94
UT (T0) with J2000 position RA = 164.49 (+4.94, -4.19) deg, Decl. =
11.87 (+1.16, -1.36) deg 90% PSF containment. Two cataloged >100 MeV
gamma-ray sources (The Fermi-LAT Collaboration 2019,
arXiv:1902.10045)�are located within the 90% IC200109A localization
error. These are the objects 4FGL J1103.0+1157 and 4FGL J1114.6+1225.
Based on a preliminary analysis of the LAT data over the timescales of
1-day and 1-month prior to T0, these objects are not significantly
detected at gamma-rays.
We searched for the existence of intermediate (months to years)
timescale emission from a new gamma-ray transient source. Preliminary
analysis indicates no significant (> 5 sigma) new excess emission (> 100
MeV), at the IC200109A 90% best-fit position. Assuming a power-law
spectrum (photon index = 2.0 fixed) for a point source at the IceCube
best-fit position, the >100 MeV flux upper limit (95% confidence) is <
4e-10 ph cm^-2 s^-1 for ~11-years (2008-08-04 / 2020-01-09 UTC), < 8e-9
(< 7e-8) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0.
Within the error circle for the direction of the neutrino, ~1.2deg
offset from the best-fit IC200109A position, a ~4 sigma excess of gamma
rays, Fermi J1055.8+1034�was detected in an analysis of the integrated
LAT data (> 100 MeV) between 2008-08-04 and �2020-01-09.�Assuming a
power-law spectrum,�the�best-fit�localization is (J2000)
RA:��163.97,�Dec: 10.58 (0.19 deg 99% containment,�0.09 deg
68%�containment), with best-fit spectral parameters flux =�(1.6 +/-
0.8)e-9 ph cm^-2 s^-1 and index = 2.06 +/- 0.18. In a preliminary
analysis of the LAT data over one day and one month prior T0, Fermi
J1055.8+1034� is not significantly detected in the LAT data.
Since Fermi normally operates in an all-sky scanning mode, regular
monitoring of this source will continue. For these sources the Fermi-LAT
contact persons are S. Garrappa (simone.garrappa at desy.de
<http://desy.de/>) and S. Buson (sara.buson at uni-wuerzburg.de
<http://uni-wuerzburg.de/>). The Fermi LAT is a pair conversion
telescope designed to cover the energy band from 20 MeV to greater than
300 GeV. It is the product of an international collaboration between
NASA and DOE in the U.S. and many scientific institutions across France,
Italy, Japan and Sweden.
GCN Circular 26747
Subject
IceCube-200109A: Candidate Counterparts from the Zwicky Transient Facility
Date
2020-01-14T15:44:12Z (5 years ago)
From
Simeon Reusch at DESY <simeon.reusch@desy.de>
*
Simeon Reusch and Robert Stein (DESY) report,��
On behalf of the Zwicky Transient Facility (ZTF) and Global Relay of
Observatories Watching Transients Happen (GROWTH) collaborations:
We observed the localization region of the neutrino event
IceCube-200109A (Stein et. al, GCN 26696) with the Palomar 48-inch
telescope, equipped with the 47 square degree ZTF camera (Bellm et al.
2019, Graham et al. 2019). We started observations in the g-band and
r-band beginning at 2020-01-11T08:03:45.800 UTC, approximately 32.4
hours after event time due to bad weather. We covered 22.4 sq deg,
corresponding to the entire localisation region. This estimate accounts
does not account for chip gaps. Each exposure was 300s with a typical
depth of 21.0 mag.��
The images were processed in real-time through the ZTF reduction and
image subtraction pipelines at IPAC to search for potential counterparts
(Masci et al. 2019). AMPEL (Nordin et al. 2019) was used to search the
alerts database for candidates. We reject stellar sources (Tachibana and
Miller 2018) and moving objects, and apply machine learning algorithms
(Mahabal et al. 2019). We are left with the following high-significance
transient candidates by our pipeline, all lying within the 90.0%
localization of the neutrino.��
+--------------------------------------------------------------------------------+
| ZTF Name �� �� | IAU Name | RA (deg) �� | DEC (deg) | Filter | Mag �� |
MagErr |
+--------------------------------------------------------------------------------+
| ZTF19acmwlds | AT 2019yfm | 163.8379011| +11.0507782 | r�� �� �� | 20.74
| 0.13 |��
| ZTF20aaeuufe | AT 2019yii | 161.616044 | +10.8570761 | r�� �� �� | 20.80
| 0.18 |����
| ZTF20aaevfwa | AT 2019zxa | 162.7251345| +12.9120284 | r�� �� �� | 21.13
| 0.21 |��
| ZTF20aaevgvt | AT 2020uw�� | 162.25426 | +10.6885268 | r�� �� �� | 20.54 |
0.16 |��
+--------------------------------------------------------------------------------+
AT 2019yfm was reported to the TNS by the Pan-STARRS1 survey (Chambers,
et al. 2019), who first detected it on 2019-11-02. This object was first
detected by ZTF on 2019-10-29, and has since faded by 1 mag. AT 2019yii
was also first reported by Pan-STARRS1 to the TNS, with a discovery on
2019-12-24. ZTF first detected it on 2019-12-29.ZTF20aaevfwa (AT
2019zxy) was first detected on 2019-12-29. It has a hostspectroscopic
redshift of z=0.13, which gives it an absolute magnitude of -17.91.
These three objects have lightcurves consistent with supernovae that are
now post-peak.
ZTF20aaevgvt (AT 2020uw) was first detected on 2020-01-07. There is no
apparent host galaxy. This candidate is consistent with being young SNe.��
The arrival of a neutrino from any of these four objects would be
consistent with a supernova CSM-interaction model for neutrino production.
We encourage spectroscopic and photometric observations to discern the
nature of the four unclassified objects listed above.
Additional observations of the localisation region of IceCube 200109A
will continue as part of the regular survey operations.
ZTF and GROWTH are worldwide collaborations comprising Caltech, USA;
IPAC, USA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA;
DESY, Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech,
Japan; IIT-B, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd,
Australia. ZTF acknowledges the generous support of the NSF under AST
MSIP Grant No 1440341. GROWTH acknowledges generous support of the NSF
under PIRE Grant No 1545949. Alert distribution service provided by
DIRAC@UW (Patterson et al. 2019). Alert database searches are done by
AMPEL (Nordin et al. 2019). Alert filtering and follow-up co-ordination
is being undertaken by the GROWTH marshal system (Kasliwal et al. 2019).
*