//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33567 SUBJECT: IceCube-230405A: IceCube observation of a high-energy neutrino candidate DATE: 23/04/05 15:35:21 GMT FROM: Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum On 2023-04-05 at 13:20:20.04 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 Bronze alerts is 30%. This alert has an estimated false alarm rate of 2.84 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/137806_8756840.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 2023-04-05 Time: 13:20:20.04 UT RA: 120.85 (+2.86 / -4.98 deg 90% PSF containment) J2000 Dec: +9.75 (+1.87 / -2.17 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. Six gamma-ray sources listed in the 4FGL-DR3 Fermi-LAT catalog are located within the 90% containment radius of the event. The nearest source is 4FGL J0802.0+1006 located at RA 120.51 deg, Dec 10.11 deg J2000, 0.49 deg away from the best-fit 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 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33581 SUBJECT: IceCube Alert 230405.56: Global MASTER-Net observations report DATE: 23/04/06 17:39:21 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the IceCube Alert 230405.56 (trigger No 8756840,07h 55m 59.76s , +10d 19m 37.2s, R=1.16) errorbox 1 days 14165 sec after notice time and 1 days 14211 sec after trigger time at 2023-04-06 17:17:11 UT, with upper limit up to 17.9 mag. Observations started at twilight. The observations began at zenith distance = 43 deg. The sun altitude is -11.0 deg. The galactic latitude b = 20 deg., longitude l = 211 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2208828 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 100702 | 2023-04-06 17:17:11 | MASTER-SAAO | (07h 55m 20.19s , +10d 20m 15.0s) | C | 180 | 16.9 | 100702 | 2023-04-06 17:17:11 | MASTER-SAAO | (07h 56m 10.87s , +10d 20m 40.2s) | C | 180 | 16.3 | 100853 | 2023-04-06 17:20:43 | MASTER-SAAO | (07h 54m 49.03s , +10d 40m 45.6s) | C | 60 | 17.7 | 100853 | 2023-04-06 17:20:43 | MASTER-SAAO | (07h 55m 39.89s , +10d 41m 11.0s) | C | 60 | 17.4 | 100933 | 2023-04-06 17:22:03 | MASTER-SAAO | (08h 03m 01.21s , +10d 41m 11.4s) | C | 60 | 17.7 | 100933 | 2023-04-06 17:22:03 | MASTER-SAAO | (08h 03m 52.04s , +10d 41m 36.8s) | C | 60 | 17.5 | 101024 | 2023-04-06 17:23:34 | MASTER-SAAO | (07h 52m 14.56s , +08d 47m 14.1s) | C | 60 | 17.9 | 101024 | 2023-04-06 17:23:34 | MASTER-SAAO | (07h 53m 05.27s , +08d 47m 39.5s) | C | 60 | 17.6 | 101104 | 2023-04-06 17:24:53 | MASTER-SAAO | (08h 00m 19.65s , +08d 48m 36.6s) | C | 60 | 17.9 | 101104 | 2023-04-06 17:24:53 | MASTER-SAAO | (08h 01m 10.45s , +08d 49m 01.9s) | C | 60 | 17.8 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33587 SUBJECT: Fermi-LAT gamma-ray observations of IceCube-230405A DATE: 23/04/07 16:59:55 GMT FROM: Simone Garrappa at DESY S. Garrappa (Ruhr-Universitaet Bochum), J. Sinapius (DESY-Zeuthen) and S. Buson (Univ. of Wuerzburg) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the IC230405A  high-energy neutrino event (GCN 33567) 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 2023-04-05 at 13:20:20.04 UT (T0) with J2000 position RA = 120.85 (+2.86, -4.98) deg, Decl. = +9.75 (+1.87, -2.17) deg (90% PSF containment).  Seven cataloged gamma-ray (>100 MeV; The Fermi-LAT collaboration 2022, ApJS, 260, 53) sources are located within the 90% IC230405A  localization region. Based on a preliminary analysis of the LAT data over a month and day timescale prior T0, these objects are not significantly detected at gamma rays. 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 IC230405A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC230405A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 1.8e-10 ph cm^-2 s^-1 for ~14-years (2008-08-04 to 2023-04-05 UTC), and < 9.4e-9 (<1.7e-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 are S. Garrappa (simone.garrappa at ruhr-uni-bochum.de), J. Sinapius (jonas.sinapius at desy.de) and S. Buson (sara.buson at 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33588 SUBJECT: Fermi-LAT gamma-ray observations of IceCube-230405A DATE: 23/04/07 17:03:58 GMT FROM: Simone Garrappa at DESY S. Garrappa (Ruhr-Universitaet Bochum), J. Sinapius (DESY-Zeuthen) and S. Buson (Univ. of Wuerzburg) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the IC230405A  high-energy neutrino event (GCN 33567) 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 2023-04-05 at 13:20:20.04 UT (T0) with J2000 position RA = 120.85 (+2.86, -4.98) deg, Decl. = +9.75 (+1.87, -2.17) deg (90% PSF containment).  Seven cataloged gamma-ray (>100 MeV; The Fermi-LAT collaboration 2022, ApJS, 260, 53) sources are located within the 90% IC230405A  localization region. Based on a preliminary analysis of the LAT data over a month and day timescale prior T0, these objects are not significantly detected at gamma rays. 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 IC230405A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC230405A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 1.8e-10 ph cm^-2 s^-1 for ~14-years (2008-08-04 to 2023-04-05 UTC), and < 9.4e-9 (<1.7e-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 are S. Garrappa (simone.garrappa at ruhr-uni-bochum.de), J. Sinapius (jonas.sinapius at desy.de) and S. Buson (sara.buson at 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33589 SUBJECT: IceCube-230405A: Upper limits from a search for additional neutrino events in IceCube DATE: 23/04/07 18:31:33 GMT FROM: Jessie Thwaites at IceCube/U Wisc-Madison 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-230405A (https://gcn.gsfc.nasa.gov/gcn/gcn3/33567.gcn3 ) in a time range of 1000 seconds centered on the alert event time (2023-04-05 13:12:00.040 UTC to 2023-04-05 13:28:40.040 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-230405A. 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-230405A is 1.3e-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 2e+02 GeV and 1e+05 GeV. A subsequent search was performed including 2 days of data centered on the alert event time (2023-04-04 13:20:20.040 UTC to 2023-04-06 13:20:20.040 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-230405A is 1.5e-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) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33611 SUBJECT: IceCube-230405A: BOOTES-4/MET Optical Upper Limits DATE: 23/04/14 15:57:24 GMT FROM: Dingrong Xiong at Yunnan Observatories of CAS, China D. R. Xiong, J. M. Bai, Y. F. Fan, K. Ye, C. J. Wang, Y. X. Xin, B. L. Lun, J. R. Mao, X. H. Zhao, L. Xu, X. G. Yu, K. X. Lu, X. Ding, D. Q. Wang (Yunnan Observatories), A. J. Castro-Tirado, E. Fernandez-Garcia, Y. D. Hu (IAA-CSIC) and C. J. Perez del Pulgar (UMA) on behalf of the BOOTES team report: On 2023-04-05 at 13:20:20.04 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin (GCN 33567). We observed the nearest gamma-ray source 4FGL J0802.0+1006 and the best-fit position of IceCube-230405A with BOOTES-4/MET robotic telescope.The magnitudes were calculated using bright stars in the same frame and the SDSS-DR16 as reference. We did not detect any optical source within the best-fit position, and also the optical counterparts of 4FGL J0802.0+1006. The upper limits of magnitudes (without being corrected for Galactic extinction) are given as follows. Sources | Tmid-T0 (day) | UT (start) | Upper Limit (error) | Exposure Time | Filter -------------------------------------------------------------------------------------------------------------- Best-fit position| 1.18 | 23-04-06 17:43:37.49 | 18.96 (0.06) | 300s | SDSS-i J0802.0+1006 | 1.2 | 23-04-06 18:08:52.38 | 18.69 (0.04) | 300s | SDSS-i ------------------------------------------------------------------------------------------------------------- The Burst Optical Observer and Transient Exploring System (BOOTES, bootes.iaa.es) is a completed world-wide network of robotic telescopes led at IAA-CSIC (Spain) which aims at following-up transients and other astrophysical sources in the sky for which the first station was installed in 1998 (Castro-Tirado et al. 1999). The fourth station of the BOOTES Network, BOOTES-4/MET, is located at the Lijiang Observatory of the Yunnan Observatories of China (Xiong et al. 2020). See also Hu et al. (2021). We acknowledge the support of BOOTES-4 technical staffs.