May 2025 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 38400] GRB 250506A: Swift ToO observations
by GCN Circulars 06 May '25

06 May '25

TITLE: GCN CIRCULAR NUMBER: 40371 SUBJECT: GRB 250506A: Swift ToO observations DATE: 25/05/06 19:55:53 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the SVOM/ECLAIRs-detected event GRB 250506A. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021828 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the SVOM/ECLAIRs event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration. Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8). This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/40371. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38399] GRB 250502A: Bassano Bresciano Observatory upper limit
by GCN Circulars 06 May '25

06 May '25

TITLE: GCN CIRCULAR NUMBER: 40370 SUBJECT: GRB 250502A: Bassano Bresciano Observatory upper limit DATE: 25/05/06 18:58:00 GMT FROM: Ulisse Quadri at Bassano Bresciano Observatory <osservatoriobassano(a)gmail.com> U.Quadri, L.Strabla and P.Madurini (Bassano Bresciano Astronomical Observatory) Members of: GRB/UAI - Gamma ray Burst section of Unione Astrofili Italiani. AAVSO - American Association of Variable Star Observers. GAC - Gruppo Astrofili Cremonesi. In a large collaboration with: M.G. Dainotti (National Astronomical Observatory of Japan), Y. Niino (Tokyo University, Institute of Astronomy), K. Kalinowski (Aarhus University, Department of Physics and Astronomy), report: We imaged the field of GRB 250502A detected by SVOM with the robotic telescope of (IAU station 565) Bassano Bresciano Observatory, Italy. The observations started 12h 23m after the trigger with our Newton telescope D=250 mm F/D=4.8. We co-added 2 series of 100 exposures of 30 sec each. Start T0+ End T0+ V lim. 12h 23m 13h 21m 19.0 13h 22m 14h 25m 19.0 We did not found any optical uncatalogued object within the SVOM error circle. Our upper limit is consistent with other observations reported by Wang et al. GCN 40313; Rakotondrainibe et al. GCN 40315; An et al. GCN 40319; Li et al. GCN 40320; Ghosh et al. GCN 40322; A. de Ugarte Postigo et al. GCN 40328 Magnitudes were estimated with the pan-STARRS cat and are derived using Lupton (2005) equations. Not corrected for galactic dust extinction. Reference: http://www.osservatoriobassano.altervista.org The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/40370. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38398] IceCube-250506A - IceCube observation of a high-energy neutrino candidate track-like event
by GCN Circulars 06 May '25

06 May '25

TITLE: GCN CIRCULAR NUMBER: 40369 SUBJECT: IceCube-250506A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 25/05/06 18:12:57 GMT FROM: A. Zegarelli at Ruhr University Bochum <azegarelli(a)icecube.wisc.edu> The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 25-05-06 at 14:14:12.09 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 0.9761 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/140896_73492707.amon) more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 25-05-06 Time: 14:14:12.09 UT RA: 116.50 (+0.59/-0.57 deg 90% PSF containment) J2000 Dec: 35.32 (+0.48/-0.43 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. No known gamma-ray sources listed in the Fermi 4FGL-DR4 or 3FHL catalogs are located within the 90% uncertainty region of the event. 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 View this GCN Circular online at https://gcn.nasa.gov/circulars/40369. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38397] IceCube Alert 250506.59: Global MASTER-Net observations report
by GCN Circulars 06 May '25

06 May '25

TITLE: GCN CIRCULAR NUMBER: 40368 SUBJECT: IceCube Alert 250506.59: Global MASTER-Net observations report DATE: 25/05/06 17:26:50 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) 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) was pointed to the IceCube Alert 250506.59 (trigger No 73492707,07h 45m 48.00s , +35d 19m 26.4s, R=0.51) errorbox 9145 sec after notice time and 9189 sec after trigger time at 2025-05-06 16:47:21 UT, with upper limit up to 18.3 mag. Observations started at twilight. The observations began at zenith distance = 70 deg. The sun altitude is -11.2 deg. The galactic latitude b = 26 deg., longitude l = 185 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2862958 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 9220 | 2025-05-06 16:47:21 | MASTER-SAAO | (07h 45m 13.02s , +35d 13m 49.3s) | C | 60 | 17.2 | 9299 | 2025-05-06 16:48:41 | MASTER-SAAO | (07h 40m 43.94s , +35d 18m 38.4s) | C | 60 | 17.3 | 9378 | 2025-05-06 16:50:00 | MASTER-SAAO | (07h 50m 27.69s , +35d 17m 49.3s) | C | 60 | 17.4 | 9458 | 2025-05-06 16:51:19 | MASTER-SAAO | (07h 45m 10.27s , +35d 14m 19.7s) | C | 60 | 17.6 | 10259 | 2025-05-06 17:04:41 | MASTER-SAAO | (07h 40m 37.95s , +35d 19m 20.4s) | C | 60 | 18.2 | 10338 | 2025-05-06 17:06:00 | MASTER-SAAO | (07h 50m 33.38s , +35d 18m 23.3s) | C | 60 | 18.1 | 10418 | 2025-05-06 17:07:19 | MASTER-SAAO | (07h 45m 09.40s , +35d 12m 53.7s) | C | 60 | 18.3 | 10577 | 2025-05-06 17:09:58 | MASTER-SAAO | (07h 45m 12.90s , +35d 14m 31.9s) | C | 60 | 18.3 | 10894 | 2025-05-06 17:15:16 | MASTER-SAAO | (07h 40m 44.89s , +35d 18m 43.8s) | C | 60 | 18.2 | 10973 | 2025-05-06 17:16:35 | MASTER-SAAO | (07h 50m 27.54s , +35d 17m 46.4s) | C | 60 | 18.0 | 11053 | 2025-05-06 17:17:54 | MASTER-SAAO | (07h 45m 16.27s , +35d 13m 44.9s) | C | 60 | 18.1 | 11212 | 2025-05-06 17:20:33 | MASTER-SAAO | (07h 45m 12.65s , +35d 13m 41.6s) | C | 60 | 18.0 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/40368. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38396] GRB 250430A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
by GCN Circulars 06 May '25

06 May '25

TITLE: GCN CIRCULAR NUMBER: 40367 SUBJECT: GRB 250430A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis DATE: 25/05/06 16:17:44 GMT FROM: Dmitry Svinkin at Ioffe Institute <svinkin(a)mail.ioffe.ru> D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration GRB 250430A (Swift-BAT detection: Parsotan et al., GCN 40292; Moss et al., GCN 40356; EP-WXT detection: Wang et al., GCN 40299) 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 ~16 sigma count-rate increase in the interval from T0-0.581 s to T0+5.307 s, where T0 = T0(BAT) = 17:31:00.28 UT. The KW light curve of this burst is available at http://www.ioffe.ru/LEA/GRBs/GRB250430A/ To derive broad-band spectral parameters of this burst, we performed a joint spectral analysis of the Swift/BAT data (15-150 keV) and the KW 3-channel spectral data (20-1600 keV). A fit to the time-averaged spectrum, measured from T0-0.581 s to T0+5.307 s, by the Band GRB function results in alpha = -0.99(-0.31,+0.70), beta = -2.01(-0.39,+0.19), and Ep = 107(-44,+86) keV (chi2/dof= 57.7/59). The total burst fluence is 3.21(-0.92,+1.09)x10^-6 erg/cm^2, and the 64-ms peak energy flux, measured from T0+0.446 s, is 1.63(-0.50,+0.58)x10^-6 erg/cm^2. (both in the 20 keV - 10 MeV energy range). Assuming the redshift z=0.767 (Garnichey et al., GCN 40301) and a standard cosmology with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014), we estimate the burst isotropic energy release E_iso to 5.26(-1.50,+1.78)x10^51 erg, the isotropic peak luminosity L_iso to 2.35(-0.72,+0.84)x10^51 erg/s, and the rest-frame peak spectral energy Ep,z to 189(-77,+151) keV. With the obtained estimates, GRB 250430A is inside 68% prediction bands for both the 'Amati' and the 'Yonetoku' relations derived for the sample of >300 long KW GRBs with known redshifts (Tsvetkova et al., 2017; Tsvetkova et al., 2021), see http://www.ioffe.ru/LEA/GRBs/GRB250430A/GRB250430A_rest_frame.pdf All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary. View this GCN Circular online at https://gcn.nasa.gov/circulars/40367. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38395] GRB 250506A: Xinglong 2.16m optical upper limit
by GCN Circulars 06 May '25

06 May '25

TITLE: GCN CIRCULAR NUMBER: 40366 SUBJECT: GRB 250506A: Xinglong 2.16m optical upper limit DATE: 25/05/06 16:04:35 GMT FROM: Liping Xin at NAOC, SVOM <xlp(a)nao.cas.cn> L. P. Xin, J. Zhen, J. Wang, H. L. Li, Y. L. Qiu, C. Wu, X. H. Han, Y. Xu, P. P. Zhang, Y. J. Xiao, L. Lan, W. J. Xie, J. S. Deng, J. Y. Wei (NAOC) report on behalf of SVOM follow-up team: We observed the field of GRB 250506A (Wang et al., GCN 40358; Maggi et al., GCN 40364; Fermi team GCN 4035). using the 2.16-m telescope located at Xinglong observatory, China, equipped with the BFOSC camera. The weather is not good. We obtained 2*200s and 7x300s frames in R-band, starting at 14:00:19 UT on 2025-05-06,about 11.65 hrs after the trigger. No any uncatalogued sources were detected within the error box of EP/FXT(Zhang et al., GCN 40365) or SVOM/Eclairs or SVOM/MXT (Maggi et al., GCN 40364) in our stacked image, down to a 3 sigma limiting magnitude of R~21.0 mag, calibrated with the nearby PanSTARRS field. View this GCN Circular online at https://gcn.nasa.gov/circulars/40366. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38394] SVOM/sb25050601: EP-FXT observations
by GCN Circulars 06 May '25

06 May '25

TITLE: GCN CIRCULAR NUMBER: 40365 SUBJECT: SVOM/sb25050601: EP-FXT observations DATE: 25/05/06 15:18:15 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> M.H. Zhang, W. Chen (NAO, CAS), H. L. Peng (NNU), H.W. Pan (NAO, CAS) on behalf of the Einstein Probe (EP) team: EP-FXT performed a follow-up observation on SVOM/sb25050601 at 2025-05-06T04:26:39 (UTC), about 2 hours after the SVOM/ECLAIRs trigger (Wang et al., GCN #40358). Considering the improved ECLAIRs position (Maggi et al., GCN #40364), an uncatalogued X-ray source (EPF_J143707.6+285246) is detected within the ECLAIRs error circle, and is potentially associated with SVOM/sb25050601. Preliminary analysis of this source was automatically conducted, with the following results: RA (J2000): 219.2802 Dec (J2000): 28.8812 Flux: 2.32 x 10^-11 erg/cm^2/s (observed, 0.5-10 keV) Flux_error: 3.4 x 10^-12 erg/cm^2/s (1 sigma) Note: The upper limit given by ROSAT is 2.86x 10^-13 erg/cm^2/s (0.2-2 keV) The position uncertainties of the above sources are about 10 arcsec in radius (90% C.L. statistical and systematic). Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). View this GCN Circular online at https://gcn.nasa.gov/circulars/40365. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38393] GRB 250506A: SVOM improved position and MXT detection of a fading X-ray afterglow
by GCN Circulars 06 May '25

06 May '25

TITLE: GCN CIRCULAR NUMBER: 40364 SUBJECT: GRB 250506A: SVOM improved position and MXT detection of a fading X-ray afterglow DATE: 25/05/06 14:47:41 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> P. Maggi (ObAS), D. Götz (CEA), H. Goto (Kanazawa University/CEA), M. Moita (CEA), C. Plasse (CEA), F. Robinet (IJCLab), C. Van Hove (IJCLab) on behalf of the SVOM/MXT Team report: M. Brunet, S. Guillot (IRAP), S. Schanne (CEA) on behalf of the SVOM/ECLAIRs Team report: Using the full X band dataset a corrected ECLAIRs position could be derived for GRB 250506A/sb25050601 (Wang et al., GCN 40358). The improved ECLAIRs position is RA=219.373, Dec=28.909 with a 90% c.l. of 6.4 arc min. The burst appeared very close to the Earth limb and only part of the burst signal was considered by the onboard processing, explaining the localization error. SVOM MXT observed the ECLAIRs error region starting at T0 = 2025-05-06T03:09:28.279 (46 min after trigger time Tb). MXT observed it during 5 orbits for a 10.9 ks effective exposure. Using the full X band dataset, we find an uncatalogued source. The source is fading with time and not detected after the fourth orbit (t+T0 > 23 ks). The best position is obtained from first orbit data (t+T0 < 2.5ks), at RA=219.267, Dec=28.8593 corresponding to: RA (J2000) = 14h37m04. Dec (J2000) = +28d51m34. with a statistical 90% C.L. radius of 32.5” to which a 35” systematic uncertainty is to be added in quadrature. The afterglow spectrum is modelled by an absorbed power law fading with time. The absorption column is NH = 3+/-1 x 1e21 /cm2 (90% C.L. uncertainties) and a photon index of 2.3 (+0.7/-0.6) in first orbit softening to 3.3 (+2.5/-1.2) in the second orbit. The average observed flux in the 0.3-8 keV band is 6.8 (+3.4/-2.2) x1e-11 erg/cm2/s during the first orbit and 1.4 (<2.7) x1e-11 erg/cm2/s during the second one. The ECLAIRs and MXT position are consistent, confirming that the MXT source is the afterglow of the GRB 250506A. This position corrects and supersedes the one reported by Wang et al. (GCN 40358). The active QSO detected by TRT (Liu et al., GCN 40360) and Swift XRT (Beardmore et al., GCN 40361) is thus unrelated to GRB 250506A. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. MXT was developed jointly by CEA, CNES, University of Leicester, IJCLab and MPE. ECLAIRs was developed jointly by CNES, IRAP, APC and CEA. The Burst Advocate (BA) on shift for this burst is Chenwei Wang: cwwang(a)ihep.ac.cn Please contact the BA by email if you require additional information regarding the SVOM follow-up of this burst. View this GCN Circular online at https://gcn.nasa.gov/circulars/40364. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38392] GRB 250506A: REM optical/NIR upper limits
by GCN Circulars 06 May '25

06 May '25

TITLE: GCN CIRCULAR NUMBER: 40363 SUBJECT: GRB 250506A: REM optical/NIR upper limits DATE: 25/05/06 14:25:25 GMT FROM: Matteo Ferro at INAF-OAB <matteo.ferro(a)inaf.it> M. Ferro, R. Brivio, P. D'Avanzo, M. G. Bernardini, S. Covino, D. Fugazza (INAF-OAB) report on behalf of the REM team: We observed the field of GRB 250506A detected by SVOM/ECLAIRs (Wang et al., GCN 40358) and Fermi GBM (Fermi GBM team, GCN 40355; Sonawane et al., GCN 40362) with the REM 60 cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, J, H, and K bands, started on 2025 May 06 at 02:43:22 UT (i.e. 20 minutes after the burst), and lasted for about 3 hours. From preliminary inspection, we do not detect any possible counterpart inside the SVOM error circle, in agreement with other follow-up observations (de Ugarte Postigo et al., GCN 40359; Liu et al., GCN 40360; Beardmore et al., GCN 40361), down to the following 3sigma limits: r > 19.8 (AB; calibrated against the Pan-STARRS catalogue), at a mid-time of 54 minutes after the trigger; H > 16.4 (Vega; calibrated against the 2MASS catalogue), at a mid-time of 31 minutes after the trigger. View this GCN Circular online at https://gcn.nasa.gov/circulars/40363. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38391] GRB 250506A: Fermi GBM Observation
by GCN Circulars 06 May '25

06 May '25

TITLE: GCN CIRCULAR NUMBER: 40362 SUBJECT: GRB 250506A: Fermi GBM Observation DATE: 25/05/06 13:07:40 GMT FROM: Rushikesh Sonawane at IISER, TVM <rushikesh23(a)iisertvm.ac.in> R. Sonawane (IISER, TVM), S. Bala (USRA), and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 02:23:22.60 UT on 06 May 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250506A (trigger 768191007/250506100). which was also detected by SVOM/ECLAIRs (Wang et al. 2025, GCN 40358). The Fermi GBM on-ground location is consistent with the SVOM/ECLAIRs position. The angle from the Fermi LAT boresight is 116 degrees. The GBM light curve consists of multiple emission episodes with a duration (T90) of about 48 s (50-300 keV). The time-averaged spectrum from T0+0.003 to T0+61.441 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.07 +/- 0.04 and the cutoff energy, parameterized as Epeak, is 280 +/- 20 keV. The event fluence (10-1000 keV) in this time interval is (2.36 +/- 0.06)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+34 s in the 10-1000 keV band is 27.4 +/- 0.5 ph/s/cm^2. 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/" View this GCN Circular online at https://gcn.nasa.gov/circulars/40362. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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