IceCube-240327B
GCN Circular 35984
Subject
IceCube-240327B - IceCube observation of a high-energy neutrino candidate track-like event
Date
2024-03-27T18:11:03Z (a year ago)
From
Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>
Via
Web form
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 2024-03-27, at 16:12:30.47 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_BRONZE alert stream. The average astrophysical neutrino purity for Gold alerts is 30%. This alert has an estimated false alarm rate of 2.420 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/139205_9784024.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:
Date: 2024-03-27
Time: 16:12:30.47 UT
RA: 89.21 (+1.36, -1.55 deg 90% PSF containment) J2000
Dec: 0.93 (+1.23, -1.47 deg 90% PSF containment) J2000
We encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino.
Five known gamma-ray sources listed in the Fermi 4FGL-DR4 or 3FHL catalogs are located within the 90% uncertainty region of the event. The nearest one to the neutrino alert position is 4FGL J0555.9+0030, located at RA = 89.00 deg, Dec = 0.51 deg J2000, 0.47 deg away from the best-fit alert position.
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 35989
Subject
IceCube-240327B: No candidates from the Zwicky Transient Facility
Date
2024-03-29T03:10:13Z (a year ago)
From
Robert Stein at Caltech <rdstein@astro.caltech.edu>
Via
Web form
Robert Stein (Caltech), Sven Weimann (Ruhr University Bochum), Jannis Necker (DESY), Simeon Reusch (DESY), Anna Franckowiak (DESY/Ruhr University Bochum) report:
On behalf of the Zwicky Transient Facility (ZTF) and Global Relay of Observatories Watching Transients Happen (GROWTH) collaborations:
As part of the ZTF neutrino follow up program (Stein et al. 2023), we observed the localization region of the neutrino event IceCube-240327B (Sommani et. al, GCN 35984) 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- and r-band beginning at 2024-03-28 03:32 UTC, approximately 11.3 hours after event time. We covered 88.6% (5.7 sq deg) of the reported localization region. This estimate accounts 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, Stein et al. 2021) 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 skymap.
No candidate counterparts were detected.
ZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA; WIS, Israel; OKC, Sweden; JSI/UMd, USA; DESY, Germany; TANGO, Taiwan; UW Milwaukee, USA; LANL, USA; TCD, Ireland; IN2P3, France.
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 is performed with the nuztf (Stein et al. 2021, https://github.com/desy-multimessenger/nuztf ).
GCN Circular 36005
Subject
IceCube-240327B: Upper limits from a search for additional neutrino events in IceCube
Date
2024-04-01T17:47:36Z (a year ago)
From
Alicia Mand at IceCube/UW-Madison <aemand@wisc.edu>
Via
Web form
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
IceCube has performed a search [1] for additional track-like muon neutrino events arriving from the direction of IceCube-240327B (https://gcn.nasa.gov/circulars/35984) in a time range of 1000 seconds centered on the alert event time (2024-03-27 16:04:10.470 UTC to 2024-03-27 16:20:50.470 UTC) during which IceCube was collecting good quality data. Excluding the event that prompted the alert, zero track-like events are found within the 90% containment region of IceCube-240327B. The IceCube sensitivity to neutrino point sources with an E^-2.5 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-240327B ranges from 1.4e-01 to 1.5e-01 GeV cm^-2 in a 1000 second time window. 90% of events IceCube would detect from a source at this declination with an E^-2.5 spectrum have energies in the approximate energy range between 3e+02 GeV and 2e+05 GeV.
A subsequent search was performed including 2 days of data centered on the alert event time (2024-03-26 16:12:30.470 UTC to 2024-03-28 16:12:30.470 UTC). In this case, we report a p-value of 1.00, consistent with no significant excess of track events. The IceCube sensitivity to neutrino point sources with an E^-2.5 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-240327B is 1.6e-01 GeV cm^-2 in a 2 day time window.
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.
[1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)
GCN Circular 36026
Subject
IceCube-240327B: GRANDMA observations of 4FGL J0555.9+0030
Date
2024-04-04T14:49:34Z (a year ago)
From
marion.pillas@ligo.org
Via
Web form
M. Pillas, S. Antier (OCA), T. Pradier (Unistra/IPHC), E. Elhosseiny (NRIAG), F. Magnani (CPPM), Sh. Agayeva, Z.Vidadi, N. Ismailov, A.Hasanov and S. Alisov. (ShAO), M. Prouza, S. Karpov, M. Masek, M. Blazek (FZU), A. Baransky, O. Pyshna, O. Sokoliuk, A. Simon, V. Vasylenko (Lisnyky), Z. Benkhaldoun, A. Kaeouch (OUCA,KNC), I. Tosta e Melo (UniCT-DFA), P. Hello (IJCLAB), M. Coughlin (UMN), C. Andrade (UMN), P-A Duverne (APC), D. Turpin (CEA-Saclay/Irfu); X. Wang (Tsinghua Uni), T. Sun (PMO):
On behalf of GRANDMA collaboration:
We observed the localization region of the neutrino event IceCube-240327B (Sommani et. al, GCN 35984, Mang et al., GCN 36005) and especially in optical the known gamma-ray source 4FGL J0555.9+0030, located at RA = 89.00 deg, Dec = 0.51 deg J2000, a potential gamma-ray source counterpart candidate (Sommani et. al, GCN 35984)
We didn’t find any optical counterpart at the location of 4FGL J0555.9+0030 from 0.8 to 4.2 days post T0 = 2024-03-27, at 16:12:0.47 UT.
Results are consistent with Stein et al., (GCN. 35989)
In the following table, we report a subset of the preliminary photometry of our observations of 4FGL J0555.9+0030. Magnitudes are reported in Vega system.
T-T0 day | MJD | Obser. | Exposure | Filter | Upper limit (5 sigma)
—------------------------------------------------------------------------------------------------
0.8 | 60397.52897106 | Yaonan-80 | 2x180s | Rc | 20.55 (Vega)
0.8 | 60397.52897106 | Yaonan-80 | 3x180s | B | 18.72 (Vega)
0.8 | 60397.52897106 | Yaonan-80 | 3x180s | Ic | 18.8 (Vega)
0.8 | 60397.52897106 | Yaonan-80 | 3x180s | V | 18 (Vega)
1.0 | 60397.70783564 | ShAO-T60 | 20x120s | V | 19.0 (Vega)
1.4 | 60398.05042824 | FRAM-Auger | 62X60s | Rc | 18.7 (Vega)
1.4 | 60398.05131481 | FRAM-Auger | 62X60s | V | 18.9 (Vega)
3.1 | 60399.74584491 | Lisnyky/AZT-8 | 29x60s | Rc | 18.8 (Vega)
3.1 | 60399.78062500 | Lisnyky/AZT-8 | 22x60s | Ic | 18.1 (Vega)
3.2 | 60399.85178840 | HAOs | 10x180 | V | 21.5 (Vega)
3.2 | 60399.87614483 | HAOs | 10x180 | Rc | 20.2 (Vega)
4.2 | 60400.88071398 | ASO | 10x180 | V | 21.9 (Vega)
Johnson filters have been measured using the Gaia catalog (except for Yaonan-80 taken calibrated with USNO and UCAC4). All the data have been reduced by a single data processing pipeline STDPIPE (Karpov et al., 2022).
We also run subtracted detection pipeline from Karpov et al., on the deepest images from HAOs and ASO at 3.2 days post T0 and couldn’t find any other new transient candidates within an 8 arcmin radius and 9 arcmin, respectively, around the location of 4FGL J0555.9+0030.
GRANDMA is a worldwide coordinated telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS497, 5518). Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).
GCN Circular 36043
Subject
Fermi-LAT gamma-ray observations of IceCube-240327B
Date
2024-04-06T18:47:40Z (a year ago)
From
Simone Garrappa at DESY <simone.garrappa@desy.de>
Via
email
S. Garrappa (Weizmann Institute of Science), C. Bartolini (INFN Bari), S. Buson (DESY; Univ. of Wuerzburg), L. Pfeiffer (Univ. of Wuerzburg) and J. Sinapius (DESY) on behalf of the Fermi-LAT collaboration:
We report an analysis of observations of the vicinity of the IC240327B high-energy neutrino event (GCN 35984) 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 2024-03-27 at 16:12:30.47 UT (T0) with J2000 position RA = 89.21 (+1.36, -1.55) deg, Decl. = +0.93 (+1.23, -1.47) deg (90% PSF containment). There are five catalogued gamma-ray (>100 MeV; The Fermi-LAT collaboration 2022, ApJS, 260, 53) sources located within the 90% IC240327B localization region.Based on a preliminary analysis of the LAT data over the timescales of 1-month and 1-day prior to T0, these objects are not significantly detected (> 5 sigma).
We searched for intermediate (days 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 IC240327B best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC240327B best-fit position, the >100 MeV flux upper limit (95% confidence) is < 9.5e-10 ph cm^-2 s^-1 for ~15-years (2008-08-04 to 2024-03-27 UTC), and < 3.4e-8 (< 3.6e-7) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0.
Since Fermi normally operates in an all-sky scanning mode, regular monitoring of this region will continue. For these observations the Fermi-LAT contact persons is S. Garrappa (simone.garrappa at weizmann.ac.il <http://eizmann.ac.il/>).
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 36050
Subject
IceCube-240327B: GRANDMA/Kilonova-Catcher observations of 4FGL J0555.9+0030 and optical upper limits
Date
2024-04-08T07:51:37Z (a year ago)
From
Damien Turpin at CEA-Saclay <dturpin-astro@hotmail.com>
Via
Web form
D. Turpin (CEA/irfu), M. Freeberg, Y. Jongen, S. Leonini, J.P. Vignes (KNC), S. Antier (OCA), T. Pradier (Unistra/IPHC), M. Coughlin (UMN), C. Andrade (UMN), P-A Duverne (APC), I. Tosta e Melo (UniCT-DFA), P. Hello (IJCLAB), N. Guessoum (AUS) on behalf of GRANDMA/Kilonova-Catcher collaboration:
We observed the localization region of the neutrino event IceCube-240327B (Sommani et. al, GCN 35984, Mang et al., GCN 36005) using the Kilonova-Catcher telescope network. From T0+1.10 days to T0+4.37 days after the IceCube detection time, we do not detect any optical counterpart at the known gamma-ray source 4FGL J0555.9+0030 position (RA = 89.00 deg, Dec = 0.51 deg J2000), a potential gamma-ray source counterpart candidate (Sommani et. al, GCN 35984). This result is consistent with Stein et al. (GCN 35989), Pillas et al. (GCN 36026)
In the following table, we report the preliminary photometry of our observations of 4FGL J0555.9+0030.
T-T0 day | MJD | Telescope | Observer | Exposure | Filter | Upper limit (5 sigma)
—------------------------------------------------------------------------------------------------
1.10 | 60397.78045138 | Montarrenti 0.53m | S. Leonini | 3x180s | Rc | 18.9 (Vega)
1.31 | 60397.98425636 | PlaneWave CDK 17" | Y. Jongen | 1x180s | Rc | 20.1 (Vega)
1.34 | 60398.01371527 | iTel T72 | M. Freeberg | 10x180s | Rc | 20.2 (Vega)
1.37 | 60398.04372057 | Planewave CDK 400 | J.P. Vignes | 8x300s | Rc | 21.6 (Vega)
1.37 | 60398.04727383 | Planewave CDK 400 | J.P. Vignes | 8x300s | V | 21.2 (Vega)
1.38 | 60398.05080265 | Planewave CDK 400 | J.P. Vignes | 8X300s | B | 21.0 (Vega)
1.41 | 60398.08996527 | TEC160FL | M. Freeberg | 15X180s | g | 19.6 (AB)
1.45 | 60398.12474537 | TEC160FL | M. Freeberg | 15x180s | r | 18.8 (AB)
1.75 | 60398.42292824 | iTel T32 | M. Freeberg | 10x180s | V | 18.9 (Vega)
2.33 | 60399.00577655 | Planewave CDK 400 | J.P. Vignes | 1x300s | Rc | 20.8 (Vega)
2.34 | 60399.01318287 | iTel T72 | M. Freeberg | 10x180s | Rc | 20.1 (Vega)
2.37 | 60399.04641997 | Planewave CDK 400 | J.P. Vignes | 8x300s | V | 21.2 (Vega)
2.37 | 60399.04994587 | Planewave CDK 400 | J.P. Vignes | 8x300s | B | 21.0 (Vega)
3.33 | 60400.00561342 | iTel T72 | M. Freeberg | 10x180s | V | 20.0 (Vega)
4.33 | 60401.00523148 | iTel T72 | M. Freeberg | 10x180s | Rc | 19.7 (Vega)
4.37 | 60401.04116386 | Planewave CDK 400 | J.P. Vignes | 8x300s | Rc | 21.7 (Vega)
4.37 | 60401.04471439 | Planewave CDK 400 | J.P. Vignes | 8x300s | V | 21.1 (Vega)
4.37 | 60401.04824406 | Planewave CDK 400 | J.P. Vignes | 8x300s | B | 20.9 (Vega)
Johnson filters have been calibrated using the Gaia DR3 catalog while the AB mag. have been calibrated using the PanSTARRS nearby stars. All the data have been reduced by a single data processing pipeline STDPIPE (Karpov et al., 2022).
We also run subtracted detection pipeline from Karpov et al., 2022, on the deepest images obtained at T0+1.38, T0+1.37 and T0+4.37 days in the B, V and Rc filters respectively. We do not detect any credible optical transient candidate down to the limiting magnitude reported in the above table. The frame are centered at RA = 88.93967° DEC = 0.51029 with an error radius ~ 21 arcmin.
GRANDMA is a worldwide coordinated telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS497, 5518). Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).