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

[vsnet-grb-info 39020] Konus-Wind detection of short/hard GRB 250704B/ EP250704a
by GCN Circulars 05 Jul '25

05 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40972 SUBJECT: Konus-Wind detection of short/hard GRB 250704B/ EP250704a DATE: 25/07/05 11:37:01 GMT FROM: Dmitry Frederiks at Ioffe Institute <fred(a)mail.ioffe.ru> D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The short-duration GRB 250704B (SVOM/GRM observation: Wang et al. GCN 40940;) associated with the EP X-ray transient EP250704a (Li et al. GCN 40491, 40956) triggered Konus-Wind (KW) at T0=29791.045 s UT (08:16:31.045). The burst shows multiple emission pulses and has a total duration of ~0.4 s. The emission is seen up to ~8 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB250704_T29791/ As observed by Konus-Wind, the burst had a fluence of (4.24 ± 0.65)x10^-6 erg/cm^2 and a 16-ms peak energy flux, measured from T0 + 0.240 s, of (5.82 ± 0.89)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum (measured from T0 to T0+0.256 s) is best fit in the 20 keV - 15 MeV range by a GRB (Band) function with the following model parameters: the low-energy photon index alpha = -1.17 (-0.08,+0.09), the high energy photon index beta = -2.48 (-1.91,+0.39), the peak energy Ep = 935(-197,+305) keV, chi2 = 53/44 dof. Assuming the redshift z=0.661 (An et al., GCN 40966) 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 (5.15 ± 0.79)x10^51 erg, the isotropic peak luminosity L_iso to (1.17 ± 0.18)x10^53 erg/s, and the rest-frame peak spectral energy Ep,z to 1550(-330,+510) keV. With the obtained estimates, the position of GRB 250704B is consistent with Type I (short/hard) GRB population in both 'Amati' and 'Yonetoku' diagrams for the sample of KW GRBs with known redshifts (Tsvetkova et al., 2017; Tsvetkova et al., 2021), see http://www.ioffe.ru/LEA/GRBs/GRB250704_T29791/GRB250704B_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/40972. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39019] EP250704a / GRB 250704B: NOT observations of the optical afterglow
by GCN Circulars 05 Jul '25

05 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40971 SUBJECT: EP250704a / GRB 250704B: NOT observations of the optical afterglow DATE: 25/07/05 11:11:01 GMT FROM: Daniele Bjørn Malesani at Cosmic Dawn Center, Niels Bohr Institute <daniele.malesani(a)nbi.ku.dk> A. Martin-Carrillo (UCD), D. B. Malesani (DAWN/NBI and Radboud), X. Liu (NAOC), A. K. Haris-Kiss (Helsinki Univ.), M. Korpi-Lagg (Aalto Univ.), S. Wedemeyer (Univ. Oslo), A. Casasbuenas Corral (IAC), report on behalf of a larger collaboration: We observed the field of the EP250704a (Li et al., GCN 40941) also detected by SVOM (GRB 250704B; Wang et al., GCN 40940), using the StanCam camera mounted on the Nordic Optical Telescope (NOT). We obtained 6x300 s exposures in the i band, starting at 2025-07-05 at 00:03:42.7 UT (15.78 hr after the EP trigger). The optical afterglow detected by COLIBRÍ (Schneider et al., GCN 40942), BOOTES-5 (Perez-Garcia et al., GCN 40957), Pan-STARRS (Gillanders et al., GCN 40958), SVOM/VT (Xin et al., GCN 40960), GROWTH-India (Mohan et al., GCN 40962), SAO RAS (Moskvitin et al., GCN 40963), JinShan (Liu et al., GCN 40965), VLT/X-shooter (An et al., GCN 40966), and VLT/HAWK-I (Yang et al., GCN 40970) is well visible in all individual images with a magnitude i = 19.78 +/- 0.05 (AB), calibrated against nearby Pan-STARRS sources and not corrected for Galactic extinction. Our i-band magnitude suggests a possible re-brightening when compared to the value reported by Liu et al. (GCN 40958), recorded about 10.29 hr after the trigger, and in general confirms the flat, and unusual, behavior of the early optical light curve. View this GCN Circular online at https://gcn.nasa.gov/circulars/40971. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39018] EP250704a / GRB 250704B: NOT observations of the optical afterglow
by GCN Circulars 05 Jul '25

05 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40971 SUBJECT: EP250704a / GRB 250704B: NOT observations of the optical afterglow DATE: 25/07/05 11:11:01 GMT FROM: Daniele Bjørn Malesani at Cosmic Dawn Center, Niels Bohr Institute <daniele.malesani(a)nbi.ku.dk> A. Martin-Carrillo (UCD), D. B. Malesani (DAWN/NBI and Radboud), X. Liu (NAOC), A. K. Haris-Kiss (Helsinki Univ.), M. Korpi-Lagg (Aalto Univ.), S. Wedemeyer (Univ. Oslo), A. Casasbuenas Corral (IAC), report on behalf of a larger collaboration: We observed the field of the EP250704a (Li et al., GCN 40941) also detected by SVOM (GRB 250704B; Wang et al., GCN 40940), using the StanCam camera mounted on the Nordic Optical Telescope (NOT). We obtained 6x300 s exposures in the i band, starting at 2025-07-05 at 00:03:42.7 UT (15.78 hr after the EP trigger). The optical afterglow detected by COLIBRÍ (Schneider et al., GCN 40942), BOOTES-5 (Perez-Garcia et al., GCN 40957), Pan-STARRS (Gillanders et al., GCN 40958), SVOM/VT (Xin et al., GCN 40960), GROWTH-India (Mohan et al., GCN 40962), SAO RAS (Moskvitin et al., GCN 40963), JinShan (Liu et al., GCN 40965), VLT/X-shooter (An et al., GCN 40966), and VLT/HAWK-I (Yang et al., GCN 40970) is well visible in all individual images with a magnitude i = 19.78 +/- 0.05 (AB), calibrated against nearby Pan-STARRS sources and not corrected for Galactic extinction. Our i-band magnitude suggests a possible re-brightening when compared to the value reported by Liu et al. (GCN 40958), recorded about 10.29 hr after the trigger, and in general confirms the flat, and unusual, behavior of the early optical light curve. View this GCN Circular online at https://gcn.nasa.gov/circulars/40971. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39017] EP250704a/GRB 250704B VLT/HAWK-I NIR afterglow detection
by GCN Circulars 05 Jul '25

05 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40970 SUBJECT: EP250704a/GRB 250704B VLT/HAWK-I NIR afterglow detection DATE: 25/07/05 10:56:20 GMT FROM: Roberto Ricci at INAF-IRA <ricci(a)ira.inaf.it> Yu-Han Yang, Niccolo Passaleva, Rosa L. Becerra, Roberto Ricci, Eleonora Troja (U. Rome) report on behalf of the ERC BHianca team: We observed the field of GRB 250704B/EP250704a (Wang et al. GCN 40940; Li et al. GCN 40491) with the HAWKI imager on the ESO VLT UT4 (Yepun) camera. Our observations were carried out approximately at T_0+20 hr in the filters J and Ks. At the position of the optical afterglow (Schneider et al. GCN 40942; Malesani et al. 40945), the NIR counterpart is clearly detected in all filters at a preliminary magnitude of J~19.5 AB, calibrated to nearby stars from 2MASS catalog (Skrutskie et al. 2006) and not corrected by the Galactic extinction. This result is consistent with the relatively flat light curve inferred from other observations (Perez-Garcia et al., GCN 40957; Gillanders et al., GCN 40958; Xin et al., GCN 40960; Mohan et al., GCN 40962). We thank the staff at the VLT, especially Thomas Szeifert, for the rapid execution of these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/40970. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39016] GRB 250702F: Kilonova-Catcher optical afterglow detection
by GCN Circulars 05 Jul '25

05 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40969 SUBJECT: GRB 250702F: Kilonova-Catcher optical afterglow detection DATE: 25/07/05 07:49:37 GMT FROM: Damien Turpin at CEA-Saclay <dturpin-astro(a)hotmail.com> E. Broens, M. Freeberg, R. Hellot (KNC), D. Turpin (CEA-Saclay/Irfu), C. Andrade(UMN), M. Pillas (ULiege), M. Tanasan (NARIT), S. Antier (OCA/IJCLAB) on behalf of the GRANDMA/Kilonova-Catcher collaboration: We observed the field of GRB 250702F (Fermi GBM team, GCN 40892; Klingler et al., GCN 40894) with the GRANDMA citizen science project Kilonova-catcher (KNC). Our observations were performed with the T-BRO telescope operated by E. Broens and the CDK17 telescope located at AITP San Pedro Chile Observatory operated by R. Hellot, the iTelescope T72 and TEC180FL telescope operated by M. Freeberg and the 14SC telescope operated by M Odeh. Our observations started at TGRB+1.8hr. In our stacked frames, subtracted from the PanSTARRS DR2 template image, we detect the optical counterpart reported by Swift/UVOT (Klingler et al., GCN 40894, Siegel et al., GCN 40933) and further confirmed by many other teams (Jelinek et al.,GCN 40895; Kumar et al., GCN 40896; Lipunov et al., GCN 40899; Martin-Carrillo et al., GCN 40900; de Ugarte Postigo et al., GCN 40901; Angulo et al., GCN 40907; Becerra et al., GCN 40911; Brivio et al., GCN 40913; An et al., GCN 40916; Dutton et al., GCN 40921; Odeh et al., GCN 40925; Moretti et al., GCN 40926; Ma et al., GCN 40936; Vinko et al., GCN 40939; Mohan et al., GCN 40946) We report some of our first image follow-up results in the table below: +---------------+-----------+------------+---------------+------------| | Tmid-TGRB (hr)| Exp (s) | Filter | Magnitude | Instrument | +===============+===========+============+===============+============+ | 1.9 | 5 x 180s | R (Vega) | 18.11 +/- 0.08 | T-BRO | | 2.8 | 300s | sdssr (AB) | 18.45 +/- 0.07 | CDK17-AITP| | 3.8 | 300s | sdssg (AB) | 19.01 +/- 0.08 | CDK17-AITP| | 3.2 | 10 x 180s | R (Vega) | 18.56 +/- 0.06 | iT72 | | 7.1 | 16 x 180s | sdssr (AB) | 19.54 +/- 0.15 | TEC180FL | +---------------+-----------+------------+----------------+-----------+ All the data have been reduced by a single data processing pipeline, STDPipe (Karpov et al., 2022). Images obtained with the sloan filters were calibrated using the PanSTARRS DR1 catalog. Images obtained with the Johnson-cousins filters were calibrated using the GAIA DR3 synphot catalog. We use the SkyPortal application (skyportal.io) to monitor our observational campaign (Coughlin et al. 2023). GRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/). View this GCN Circular online at https://gcn.nasa.gov/circulars/40969. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39015] GRB 250702F: Monte Agliale Observatory optical observations
by GCN Circulars 05 Jul '25

05 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40968 SUBJECT: GRB 250702F: Monte Agliale Observatory optical observations DATE: 25/07/05 06:56:14 GMT FROM: Fabrizio Ciabattari at Monte Agliale Observatory <fabciaba(a)alice.it> F. Ciabattari, S. Donati, G. Fornaciari, S. Guidotti, E. Mazzoni, M. Rossi, R. Simonetti, R. Bernacchi, F. Biagini, R. Gemignani, M. Giovannini and G. Petroni (Monte Agliale Observatory, Borgo a Mozzano, Italy) report: We observed the field of GRB 250702F (Klingler et al. GCN 40894) with the automatic 0.5m f/4.6 Newtonian telescope + SBIG ST10 camera at Monte Agliale Observatory (Borgo a Mozzano, Italy, MPC code 159). The observations started at 2025-07-02 21:08:57.6 UT (135 seconds after the burst) and were automatically triggered by notices received via the kafka platform. A series of 15 unfiltered images of 30 seconds each was taken and we detect the optical counterpart reported by Klingler et al. (GCN Circ. 40894) and many other observers. As described by Jelinek et al. (GCN Circ. 40895) the light curve peaked at unfiltered magnitude ~15 and showed a slow decay in the following minutes with a decrease of approximately 0.5 mag in 6 minutes. A Differential Photometric Analysis of this GRB is available at: https://www.oama.it/archivio/GRB250702F/grb_250702f.htm View this GCN Circular online at https://gcn.nasa.gov/circulars/40968. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39014] GRB250702F: afterglow detected by joint EP-ZTF shadowing program
by GCN Circulars 05 Jul '25

05 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40967 SUBJECT: GRB250702F: afterglow detected by joint EP-ZTF shadowing program DATE: 25/07/05 06:48:13 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> R. D. Liang, D.Y. Li, H. Q. Cheng, Z. X. Ling (NAO, CAS), Y. J. Zhang (THU), C. Zhou (HUST), G. Y. Zhao (SYSU), A. Li (BNU), Y. H. Cheng (SWIFAR, YNU), C. C. Jin, and W. M. Yuan (NAO, CAS), Robert Stein (UMD), Tomas Ahumada (Caltech), Mansi Kasliwal(Caltech), Theophile du Laz (Caltech), and Lin Yan (Caltech) on behalf of the Einstein Probe (EP) team and the Zwicky Transient Facility Partnership: We report on the joint identification of the afterglow of GRB 250702F (Swift/BAT detection, GCN 40894; Fermi/GBM detection, GCN 40892) by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission and ZTF through the EP-ZTF shadowing program (Ahumada et al., GCN 39791). The EP-WXT observation started at 2025-07-02 21:41:26 (UTC), about 2ks after Swift/BAT detection. The WXT position of the source is R.A. = 212.899 deg, DEC = 16.74 deg (J2000) with an uncertainty of 3 arcmin in radius (90% C.L. statistical and systematic), which is consistent with the optical counterpart (ZTF25aazgntl/AT2025qdw, TNS#183358; Klingler et al., GCN 40894; Jelinek et al., GCN 40895; Kumar et al., GCN 40896; Lipunov et al., GCN 40899; Martin-Carrillo et al. GCN 40900; de Ugarte Postigo et al. GCN 40901; Angulo et al. GCN 40907; Becerra et al. GCN 40911; Brivio et al. GCN 40913; An et al. GCN 40916; Odeh et al. GCN 40925; Moretti et al. GCN 40926) and the X-ray counterpart (Swift/XRT team, GCN 40902, GCN 40928). The WXT spectrum can be fitted with an absorbed power law model with fixed column density of 1.34e20 cm^-2, a photon index of 2.06+/-0.71, and an unabsorbed 0.5-4 keV flux of (5.13+/-0.81)e-11 erg/s/cm^2, which is consistent with Swift/XRT analysis (Swift/XRT team, GCN 40928). The contact transient advocate of this source is Runduo Liang (liangrd(a)bao.ac.cn). Please contact him for coordination of multi-wavelength follow-up observations and access to EP-WXT data. 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/40967. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39013] EP250704a / GRB 250704B: VLT/X-shooter spectroscopic redshift z = 0.661
by GCN Circulars 05 Jul '25

05 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40966 SUBJECT: EP250704a / GRB 250704B: VLT/X-shooter spectroscopic redshift z = 0.661 DATE: 25/07/05 06:15:41 GMT FROM: J. An <jiean0813(a)foxmail.com> J. An (NAOC), D. B. Malesani (DAWN/NBI and Radboud), D. Xu, X. Liu, Z.P. Zhu (NAOC), B. Schneider (LAM), M. De Pasquale (Univ. of Messina), V. D’Elia (SSDC & INAF-OAR), A. L. Thakur (INAF/IAPS), D. Pieterse (Radboud), A. J. Levan (Radboud and Warwick), N. R. Tanvir (Univ. Leicester) report on behalf of the Stargate collaboration: We observed the optical counterpart of EP250704a detected by EP/WXT (Li et al., GCN 40941), also likely by SVOM/GRM as GRB 250704B (Wang et al., GCN 40940), using the ESO VLT UT3 (Melipal) equipped with the X-shooter spectrograph. Our spectra cover the wavelength range 3000-21000 AA, and consist of 4 exposures of 1200 s each. The observation mid time was 2025-07-05 03:51:50.164 UT (19.58 hr after the GRB). In the acquisition camera, the optical counterpart (first discovered by Schneider et al., GCN 40942) is well detected in the Sloan r- band, and we measure a magnitude r ~ 20.0 AB, at a mid time Jul 5.13 UT (18.8 hr after trigger), calibrated against nearby Pan-STARRS DR2 stars. In a preliminary reduction of the spectra, we detect a continuum over the entire covered wavelength range (down to ~3100 AA at the blue end). From the detection of multiple absorption lines, which we interpret as due to the Mg II doublet, several Fe II lines and Mg I, we infer a redshift of z = 0.661. No emission lines are detected at this redshift. We acknowledge excellent support from the ESO observing staff in Paranal, in particular Cedric Ledoux, Diego Parraguez, and Robert Klement. View this GCN Circular online at https://gcn.nasa.gov/circulars/40966. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39012] EP250704a / GRB 250704B: JinShan optical observations
by GCN Circulars 05 Jul '25

05 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40965 SUBJECT: EP250704a / GRB 250704B: JinShan optical observations DATE: 25/07/05 05:07:19 GMT FROM: liuxing(a)nao.cas.cn X. Liu, J. An, Z.P. Zhu, S.Q. Jiang, L.B. He, D. Xu (NAOC), S.Y. Fu (HUST), J.Z. Liu (XAO) report on behalf of a large collaboration: We observed the field of EP250704a detected by EP/WXT (Li et al., GCN 40941), also likely by SVOM/GRM as GRB 250704B (Wang et al., GCN 40940), using the 100cm-C telescope (100C) of the JinShan project, located at Altay, Xinjiang, China. Observations started at 18:01:00 UT on 2025-07-04, i.e., 9.74 hr after the trigger, and 12 x 300 s frames in Sloan i-band were obtained at a mid-time of 10.29 hr post-trigger. The optical afterglow (e.g., Schneider at el., GCN 40942; Malesani at el., GCN 40945; Brivio at el., GCN 40947, etc.) was clearly detected in our stacked image, with a preliminary magnitude of i ~ 19.9, calibrated with nearby Pan-STARRS stars and without the Galactic extinction correction. We acknowledge the excellent support from T.Q. Chen and J.L. He for enabling these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/40965. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39011] GRB 250704A: SVOM/VT optical observation
by GCN Circulars 05 Jul '25

05 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40964 SUBJECT: GRB 250704A: SVOM/VT optical observation DATE: 25/07/05 03:16:00 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> J. X. Cao(GXU), Y. H. Cheng(SWIFAR,YNU), L. P. Xin, Y. L. Qiu, C. Wu, H. L. Li, Z. H. Yao, Y. N. Ma, X. H. Han, Y. Xu, J. Wang, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, L. Lan, J. S. Deng, J. Y. Wei (NAOC), J. Palmerio (CEA) report on behalf of the SVOM/VT team SVOM/VT performed an automatic slew on the burst GRB 250704A (sb25070404) triggered by SVOM/ECLAIRs (Cao et al., GCN 40934) in the VT_B (400nm-650nm) and VT_R (650nm-1000nm) channels simultaneously. Part of X band data was received. The optical afterglow (Schneider et al., GCN 40953) within the errorbox of Swift/XRT (Osborne et al., GCN 40950) and SVOM/MXT (Cao et al., GCN 40934) was clearly detected in both VT_B and VT_R images. The magnitudes are VT_B=20.80+/-0.05 mag and VT_R=20.52+/-0.05 mag in AB magnitude at the mid time of 8.3 hours post the burst. Our photometry was not corrected for Galactic extinction. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Centre for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC), CAS. The SVOM/VT point of contact for this burst is: Jiaxin Cao: cjx(a)st.gxu.edu.cn. View this GCN Circular online at https://gcn.nasa.gov/circulars/40964. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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