August 2022 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 30394] IceCube-220822A: No significant detection in HAWC
by GCN Circulars 31 Aug '22

31 Aug '22

TITLE: GCN CIRCULAR NUMBER: 32504 SUBJECT: IceCube-220822A: No significant detection in HAWC DATE: 22/08/31 19:52:17 GMT FROM: Hugo Ayala at Pennsylvania State University <hgayala(a)psu.edu> Hugo Ayala (PSU) reports on behalf of the HAWC collaboration (http://www.hawc-observatory.org/collaboration): On 2022-08-22 20:26:30.03 UTC, the IceCube collaboration reported a track-like very-high-energy event that has a high probability of being an astrophysical neutrino, IceCube-220822A. Location is at RA: 273.08 (+2.47, -2.50 deg 90% PSF containment) J2000 Dec: +21.54 (+0.94, -1.18 deg 90% PSF containment) J2000 (GCN circular 32475). 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 June 2019. We searched inside the reported IceCube error region. The most significant location, with p-value 7.62e-4 (0.04 post-trials), is at RA 274.13 deg, Dec +20.38 deg (±0.27 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 = 1.33e-13(E/TeV)^-0.3 TeV.cm^-2.s^-1 Search for a transient source. Since the event was not in our field of view at the time reported, we report the combined result for the transits before and after the IceCube event. Data acquisition started on 2022/08/21 05:42:32 UTC and ended 2022/08/23 05:55:16 UTC. The most significant location, with p-value 3.7e-2 (0.87 post-trials), is at RA 272.33 deg, Dec +22.51 deg (±0.24 deg 68% containment) J2000. We set a time-integrated 95% CL upper limit at the position of maximum significance of: E^2 dN/dE = 5.88e-12 (E/TeV)^-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.

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[vsnet-grb-info 30393] Fermi trigger No 683537972: Global MASTER-Net observations report
by GCN Circulars 30 Aug '22

30 Aug '22

TITLE: GCN CIRCULAR NUMBER: 32503 SUBJECT: Fermi trigger No 683537972: Global MASTER-Net observations report DATE: 22/08/30 20:30:25 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> 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 Fermi GRB220830.32 (trigger No 683537972,15h 59m 04.80s , -64d 21m 00.0s, R=1.15) errorbox 30475 sec after notice time and 36883 sec after trigger time at 2022-08-30 17:54:11 UT, with upper limit up to 15.6 mag. The observations began at zenith distance = 39 deg. The sun altitude is -20.5 deg. The galactic latitude b = -9 deg., longitude l = 322 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2071750 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 36914 | 2022-08-30 17:54:11 | MASTER-SAAO | (15h 33m 22.17s , -65d 13m 16.5s) | C | 60 | 15.1 | 37005 | 2022-08-30 17:55:41 | MASTER-SAAO | (15h 52m 22.38s , -65d 15m 22.1s) | C | 60 | 14.9 | 37089 | 2022-08-30 17:57:06 | MASTER-SAAO | (16h 09m 25.41s , -65d 15m 39.5s) | C | 60 | 15.5 | 37277 | 2022-08-30 18:00:14 | MASTER-SAAO | (16h 12m 29.28s , -63d 22m 49.3s) | C | 60 | 15.2 | 37586 | 2022-08-30 18:05:22 | MASTER-SAAO | (16h 01m 18.75s , -61d 26m 07.0s) | C | 60 | 14.9 | 37697 | 2022-08-30 18:07:14 | MASTER-SAAO | (15h 38m 49.17s , -63d 19m 47.8s) | C | 60 | 14.7 | 37809 | 2022-08-30 18:09:06 | MASTER-SAAO | (15h 56m 34.36s , -63d 19m 41.9s) | C | 60 | 15.1 | 37902 | 2022-08-30 18:10:39 | MASTER-SAAO | (15h 33m 26.76s , -65d 13m 22.5s) | C | 60 | 15.3 | 37995 | 2022-08-30 18:12:12 | MASTER-SAAO | (15h 52m 22.87s , -65d 15m 20.0s) | C | 60 | 15.1 | 38091 | 2022-08-30 18:13:48 | MASTER-SAAO | (16h 09m 35.70s , -65d 16m 09.9s) | C | 60 | 15.6 | 38315 | 2022-08-30 18:17:32 | MASTER-SAAO | (16h 12m 38.25s , -63d 22m 07.6s) | C | 60 | 15.3 | 40276 | 2022-08-30 18:50:13 | MASTER-SAAO | (16h 01m 23.55s , -61d 24m 50.4s) | C | 60 | 12.9 | 40369 | 2022-08-30 18:51:45 | MASTER-SAAO | (15h 39m 02.46s , -63d 18m 31.7s) | C | 60 | 13.5 | 40478 | 2022-08-30 18:53:35 | MASTER-SAAO | (15h 56m 42.56s , -63d 20m 27.1s) | C | 60 | 13.3 | 40558 | 2022-08-30 18:54:55 | MASTER-SAAO | (15h 33m 31.53s , -65d 12m 39.9s) | C | 60 | 13.6 | 40649 | 2022-08-30 18:56:25 | MASTER-SAAO | (15h 52m 32.24s , -65d 12m 05.0s) | C | 60 | 13.5 | 40763 | 2022-08-30 18:58:20 | MASTER-SAAO | (16h 09m 41.60s , -65d 14m 38.1s) | C | 60 | 14.4 | 41005 | 2022-08-30 19:02:21 | MASTER-SAAO | (16h 12m 45.09s , -63d 20m 07.9s) | C | 60 | 13.8 | 42064 | 2022-08-30 19:20:01 | MASTER-SAAO | (16h 01m 26.47s , -61d 23m 59.5s) | C | 60 | 13.6 | 42484 | 2022-08-30 19:27:01 | MASTER-SAAO | (15h 48m 47.43s , -67d 05m 09.0s) | C | 60 | 13.1 | 42575 | 2022-08-30 19:28:32 | MASTER-SAAO | (16h 07m 22.13s , -67d 06m 19.0s) | C | 60 | 13.6 | 46012 | 2022-08-30 20:25:49 | MASTER-SAAO | (15h 48m 50.47s , -67d 04m 13.5s) | C | 60 | 14.2 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.

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[vsnet-grb-info 30392] Fermi GBM trigger 683571622/220830709 is not a GRB
by GCN Circulars 30 Aug '22

30 Aug '22

TITLE: GCN CIRCULAR NUMBER: 32502 SUBJECT: Fermi GBM trigger 683571622/220830709 is not a GRB DATE: 22/08/30 19:28:52 GMT FROM: Cori Fletcher at USRA <cfletcher(a)usra.edu> C. Fletcher (USRA) reports on behalf of the Fermi GBM Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 683571622/220830709 at 17:00:17.49 UT on 30 August 2022, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to particle activity. For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"

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[vsnet-grb-info 30391] Fermi trigger No 683476673: Global MASTER-Net observations report
by GCN Circulars 30 Aug '22

30 Aug '22

TITLE: GCN CIRCULAR NUMBER: 32501 SUBJECT: Fermi trigger No 683476673: Global MASTER-Net observations report DATE: 22/08/30 13:30:13 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> 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-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB220829.61 (trigger No 683476673,03h 07m 12.00s , +55d 21m 00.0s, R=1) errorbox 42739 sec after notice time and 81444 sec after trigger time at 2022-08-30 13:15:13 UT, with upper limit up to 18.2 mag. The observations began at zenith distance = 56 deg. The sun altitude is -24.0 deg. The galactic latitude b = -2 deg., longitude l = 142 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2071460 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 41582 | 2022-08-30 02:10:20 | MASTER- | (03h 11m 34.98s , +54d 10m 56.7s) | C | 60 | 17.1 | 81474 | 2022-08-30 13:15:13 | MASTER-Amur | (02h 58m 45.56s , +54d 20m 33.2s) | C | 60 | 15.2 | 81554 | 2022-08-30 13:16:32 | MASTER-Amur | (03h 12m 35.91s , +54d 21m 02.5s) | C | 60 | 16.1 | 81634 | 2022-08-30 13:17:52 | MASTER-Amur | (03h 07m 17.65s , +56d 14m 38.4s) | C | 60 | 18.2 | 81714 | 2022-08-30 13:19:12 | MASTER-Amur | (03h 21m 45.83s , +56d 16m 45.3s) | C | 60 | 18.1 | 81875 | 2022-08-30 13:21:53 | MASTER-Amur | (03h 04m 25.92s , +52d 27m 28.2s) | C | 60 | 18.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.

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[vsnet-grb-info 30390] Konus-Wind detection of GRB 220826A
by GCN Circulars 29 Aug '22

29 Aug '22

TITLE: GCN CIRCULAR NUMBER: 32500 SUBJECT: Konus-Wind detection of GRB 220826A DATE: 22/08/29 17:46:51 GMT FROM: Dmitry Frederiks at Ioffe Institute <fred(a)mail.ioffe.ru> D. Frederiks, A.Lysenko, A. Ridnaya, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long GRB 220826A (Swift detection: Caputo et al., GCN 32484; Fermi GBM observation: Veres & Meegan, GCN 32495) was detected by Konus-Wind (KW) in the waiting mode. A Bayesian block analysis of the KW waiting mode data in the 20-400 keV band reveals a >10 sigma count rate increase in the interval from T0-0.525 s to T0+37.747 s where T0 = T0(BAT) = 11:55:21.742 UT. The KW light curve of this burst is available at http://www.ioffe.ru/LEA/GRBs/GRB220826A/ Modeling a time-integrated spectrum of the burst by a power law with exponential cutoff (CPL) model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -0.48 (-0.22, + 0.25) and Ep = 113(-4,+4) keV. In the 10 keV -10 MeV band, standard for the KW analysis, the burst fluence is (2.53 ± 0.29)x10^-6 erg/cm^2 and the 2.944 s peak energy flux is (2.86 ± 0.18)x10^-7 erg/cm^2/s. All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary.

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[vsnet-grb-info 30389] IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube
by GCN Circulars 29 Aug '22

29 Aug '22

TITLE: GCN CIRCULAR NUMBER: 32499 SUBJECT: IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube DATE: 22/08/29 14:14:46 GMT FROM: Jessie Thwaites at IceCube/U Wisc-Madison <thwaites(a)wisc.edu> The IceCube Collaboration (http://icecube.wisc.edu/) reports: IceCube has performed a search [1] for track-like muon neutrino events arriving from the direction of IceCube-Cascade 220826A (https://gcn.gsfc.nasa.gov/notices_amon_icecube_cascade/136985_60401984.amon) in a time range of 1000 seconds centered on the alert event time (2022-08-26 21:29:53.690 UTC to 2022-08-26 21:46:33.690 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-Cascade 220826A. 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-Cascade 220826A 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 2e+02 GeV and 1e+05 GeV. A subsequent search was performed including 2 days of data centered on the alert event time (2022-08-25 21:38:13.690 UTC to 2022-08-27 21:38:13.690 UTC). In this case, we report a p-value of 0.02, 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-Cascade 220826A ranges from 1.6e-01 to 1.8e-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(a)icecube.wisc.edu<mailto:roc@icecube.wisc.edu>. [1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)

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[vsnet-grb-info 30388] IceCube-220822A: Classification of AT2022saw as a Type Ia supernova
by GCN Circulars 28 Aug '22

28 Aug '22

TITLE: GCN CIRCULAR NUMBER: 32498 SUBJECT: IceCube-220822A: Classification of AT2022saw as a Type Ia supernova DATE: 22/08/28 19:58:48 GMT FROM: Robert Stein at Caltech <rdstein(a)caltech.edu> Robert Stein, Zach Vanderbosch, Ilaria Caiazzo (Caltech), Jannis Necker, Simeon Reusch (DESY), Sven Weimann (Ruhr University Bochum), Mansi Kasliwal, Viraj Karambelkar (Caltech), Anna Franckowiak (DESY/Ruhr University Bochum) and Jesper Sollerman (Stockholm) report: We observed neutrino IC220822A (Lincetto et. al, GCN 32475) with the Zwicky Transient Facility (Necker et al., GCN 32480) as part of our ZTF neutrino follow-up program (Stein et al. 2022). As part of these observations, we reported the transient ZTF22aarmiqk/AT2022saw as a possible optical counterpart. We undertook spectroscopic observations of AT2022saw with the Low Resolution Imaging Spectrometer (LRIS, Oke et al. 95) at the Keck I Observatory. Using SNID (Blondin et al. 2007), we classify AT2022saw as a type Ia supernova at redshift z=0.14 (see https://www.wis-tns.org/object/2022saw for the full spectrum), approximately 50 days post peak. Given that type Ia supernovae are not predicted to emit high-energy neutrinos, we therefore exclude AT2022saw as a candidate counterpart to IC220822A. The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.

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[vsnet-grb-info 30387] GRB 220827A: Fermi GBM Final Real-time Localization
by GCN Circulars 27 Aug '22

27 Aug '22

TITLE: GCN CIRCULAR NUMBER: 32497 SUBJECT: GRB 220827A: Fermi GBM Final Real-time Localization DATE: 22/08/27 21:40:19 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 21:30:03 UT on 27 Aug 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220827A (trigger 683328608.07386 / 220827896). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 113.1, Dec = -1.1 (J2000 degrees, equivalent to J2000 07h 32m, -1d 06'), with a statistical uncertainty of 15.1 degrees. The angle from the Fermi LAT boresight is 99.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220827896/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220827896/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220827896/…

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[vsnet-grb-info 30386] GRB 220826A: Swift-BAT refined analysis
by GCN Circulars 27 Aug '22

27 Aug '22

TITLE: GCN CIRCULAR NUMBER: 32496 SUBJECT: GRB 220826A: Swift-BAT refined analysis DATE: 22/08/27 19:50:26 GMT FROM: Amy Lien at GSFC <amy.y.lien(a)nasa.gov> T. Sakamoto (AGU), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), R. Caputo (GSFC), M. Stamatikos (OSU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 220826A (trigger #1121751) (Caputo et al., GCN Circ. 32484). The BAT ground-calculated position is RA, Dec = 206.421, -44.036 deg which is RA(J2000) = 13h 45m 41.0s Dec(J2000) = -44d 02' 10.1" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 92%. The mask-weighted light curve shows a multi-peaked structure that starts at ~T0 and ends at ~T+13 s. There are roughly three main peaks at ~T+1 s, ~T+7 s, and ~T+11 s. respectively. T90 (15-350 keV) is 11.14 +- 1.02 sec (estimated error including systematics). The time-averaged spectrum from T-0.20 to T+13.01 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.44 +- 0.10. The fluence in the 15-150 keV band is 1.2 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+6.58 sec in the 15-150 keV band is 2.6 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/1121751/BA/

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[vsnet-grb-info 30385] GRB 220826A: Fermi GBM observation
by GCN Circulars 27 Aug '22

27 Aug '22

TITLE: GCN CIRCULAR NUMBER: 32495 SUBJECT: GRB 220826A: Fermi GBM observation DATE: 22/08/27 11:13:39 GMT FROM: Andreas von Kienlin at MPE <azk(a)mpe.mpg.de> P. Veres and C. Meegan (both UAH) report on behalf of the Fermi GBM Team: "At 11:55:22.98 UT on 26 August 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 220826A (trigger 220826497 / 683207727) which was also detected by the Swift/BAT (Caputo et al., GCN 32484) The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 54 degrees. The GBM light curve shows two pulses with a duration (T90) of about 16.6 s (50-300 keV). The time-averaged spectrum from T0-0.5 s to T0+10.8 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.66 +/- 0.20 and the cutoff energy, parameterized as Epeak, is 113 +/- 14 keV The event fluence (10-1000 keV) in this time interval is (1.50 +/- 0.14)E-6 erg/cm^2. The 1-sec peak photon flux measured starting from T0 + 5.2 s in the 10-1000 keV band is 4.3 +/- 0.3 ph/s/cm^2. A Band function fits the spectrum equally well with Epeak= 66 +/- 13 keV, alpha = 0.28 +/- 0.58 and beta = -2.14 +/- 0.18. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"

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vsnet-grb-info August 2022