August 2024 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 35205] GRB 240819A: Swift afterglow confirmation
by GCN Circulars 27 Aug '24

27 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37311 SUBJECT: GRB 240819A: Swift afterglow confirmation DATE: 24/08/27 16:41:54 GMT FROM: Antonino D'Ai' at IASF-PA <antonino.dai(a)inaf.it> Antonino D’Ai, Elena Ambrosi (INAF/IASF-PA) report on behalf of the Swift-XRT team: Swift performed a second epoch follow-up observation for Source2 (D’Avanzo et al., GCN 37218), the likely counterpart for the SVOM/Eclairs-detected X-ray transient GRB 240819A (Coleiro et al., GCN 37208). We collected 3.4 ks of … [View More]

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[vsnet-grb-info 35204] GRB 240825A: TNG optical photometry and spectroscopy
by GCN Circulars 27 Aug '24

27 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37310 SUBJECT: GRB 240825A: TNG optical photometry and spectroscopy DATE: 24/08/27 10:19:29 GMT FROM: Andrea Melandri at INAF-OAR <andrea.melandri(a)inaf.it> A. Melandri (INAF-OAR), P. D'Avanzo, M. Ferro (INAF-OAB), V. D'Elia (INAF/OAR & ASI/ASDC), D. B. Malesani (DAWN/NBI and Radboud Univ.), A. Rossi (INAF-OAS), A. Harutyunyan , and D. Carosati (INAF-TNG) report on behalf of the CIBO collaboration: We observed the optical afterglow of long … [View More]

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[vsnet-grb-info 35203] LIGO/Virgo/KAGRA S240825ar: Updated Sky localization
by GCN Circulars 27 Aug '24

27 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37309 SUBJECT: LIGO/Virgo/KAGRA S240825ar: Updated Sky localization DATE: 24/08/27 07:48:46 GMT FROM: Nihar.Gupte(a)aei.mpg.de We have conducted further analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S240825ar (GCN Circular 37268). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, … [View More]

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[vsnet-grb-info 35202] LIGO/Virgo/KAGRA S240825ar: Updated Sky localization
by GCN Circulars 27 Aug '24

27 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37308 SUBJECT: LIGO/Virgo/KAGRA S240825ar: Updated Sky localization DATE: 24/08/27 07:48:43 GMT FROM: Nihar.Gupte(a)aei.mpg.de We have conducted further analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S240825ar (GCN Circular 37268). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, … [View More]

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[vsnet-grb-info 35201] GRB 240825A: NUTTelA-TAO / BSTI Optical Limits
by GCN Circulars 27 Aug '24

27 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37307 SUBJECT: GRB 240825A: NUTTelA-TAO / BSTI Optical Limits DATE: 24/08/27 04:22:06 GMT FROM: Zhanat Maksut at Nazarbayev University <zhanat.maksut(a)nu.edu.kz> Z. Maksut (NU), B. Grossan (UCB, NU), T. Komesh (NU), Z. Abdullayev (NU), M. Krugov (FAI) and E. Abdikamalov (NU) report on behalf of the Energetic Cosmos Laboratory: The Nazarbayev University Transient Telescope at Assy-Turgen Astrophysical Observatory (NUTTelA-TAO) observed the field of … [View More]

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[vsnet-grb-info 35200] GRB 240825A: GMG Continued Optical Observation on the Second Night
by GCN Circulars 27 Aug '24

27 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37306 SUBJECT: GRB 240825A: GMG Continued Optical Observation on the Second Night DATE: 24/08/27 02:34:35 GMT FROM: wangbaiting(a)ynao.ac.cn B.-T. Wang, F.-F. Song, R.-Z. Li, J. Mao, Y.-X. Xin, and J.-M. Bai (YNAO, CAS) report: We observed the field of GRB 240825A (Gupta et al., GCN 37274, T0 at 2024-08-25T15:52:59) for the second time using the GMG-2.4m telescope at the Lijiang Observatory. The observation began at 2024-08-26T15:14:04, about 23.4 hours … [View More]

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[vsnet-grb-info 35199] GRB 240824B: Ondrejov D50 optical limit
by GCN Circulars 26 Aug '24

26 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37305 SUBJECT: GRB 240824B: Ondrejov D50 optical limit DATE: 24/08/26 21:44:19 GMT FROM: Martin Jelinek at Astro.Inst-AVCR,Ondrejov <martin.jelinek(a)asu.cas.cz> Martin Jelinek, Jan Strobl, Alzbeta Malenakova, Rene Hudec and Cyril Polasek (ASU CAS Ondrejov, CZ), report: We observed the Swift-XRT localization (Kennea et al. GCN 37270) of the Fermi/GBM (Fermi GBM Team GCN 37260, Sharma et al. GCN 37284), MAXI/GSC (Nakajima et al. GCN 37261) and Swift/… [View More]

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[vsnet-grb-info 35198] GRB 240825A: KAIT optical observations
by GCN Circulars 26 Aug '24

26 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37304 SUBJECT: GRB 240825A: KAIT optical observations DATE: 24/08/26 17:49:29 GMT FROM: Weikang Zheng at UC Berkeley <weikang(a)berkeley.edu> WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on behalf of the KAIT GRB team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to GRB 240825A (Gupta et al., GCN 37274; Fermi GBM team, GCN 37273) starting at 05:36 UT, Aug. 26th, about 13.73 hours … [View More]

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[vsnet-grb-info 35197] GRB 250825A: PRIME near-infrared detection
by GCN Circulars 26 Aug '24

26 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37303 SUBJECT: GRB 250825A: PRIME near-infrared detection DATE: 24/08/26 17:12:41 GMT FROM: Joe Durbak at UMD <gcn.joedurbak(a)gmail.com> O. Guiffreda (UMD), J. Durbak (UMD), S. Atri (U Rome), A. S. Kutyrev (NASA/GSFC), E. Troja (U Rome), K. De (MIT), S. B. Cenko (NASA/GSFC) Following the Swift BAT detection (GCN 37274), and Fermi GBM detection (GCN 37273), we observed the transient field in J and H filters with PRIME ~8 hours after FERMI & Swift … [View More]

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[vsnet-grb-info 35196] Konus-Wind detection of GRB 240825A (bright/long)
by GCN Circulars 26 Aug '24

26 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37302 SUBJECT: Konus-Wind detection of GRB 240825A (bright/long) DATE: 24/08/26 17:10:30 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 bright, long GRB 240825A (Fermi GBM detection: Fermi GBM team, GCN 37273; Sharma & Meegan, GCN 37303; Swift detection: Gupta et al., GCN 37274; Fermi LAT … [View More]detection: Di Lalla et al., GCN 37288; AstroSat CZTI detection: Joshi al., GCN 37298) triggered Konus-Wind (KW) at T0=57185.048 s UT (15:53:05.048). The burst light curve shows a bright multi-peaked emission pulse, which starts at ~T0 - 0.1 s, peaks around ~T0 + 0.256 s, and has a total duration of ~2 s. This pulse is followed by a weaker emission, which lasts until ~T0 + 25 s. The emission is seen up to ~10 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB240825_T57185/ As observed by Konus-Wind, the burst had a fluence of (1.66 ± 0.08)x10^-4 erg/cm^2 and a 64-ms peak energy flux, measured from T0 + 0.256 s, of (1.52 ± 0.07)x10^-4 erg/cm^2/s (both in the 20 keV - 10 MeV energy range). A time-averaged spectrum (measured from T0 to T0+28.16 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 = -0.79 (-0.04,+0.05), the high energy photon index beta = -2.10 (-0.8,+0.06), the peak energy Ep = 403 (-37,+40) keV, chi2 = 99/97 dof. A spectrum near the peak count rate (measured from T0 to T0+0.512 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 = -0.30 (-0.11,+0.12), the high energy photon index beta = -2.30 (-0.09,+0.08), the peak energy Ep = 405 (-36,+41) keV, chi2 = 68/63 dof. Assuming the redshift z=0.659 (Martin-Carrillo et al., GCN 37253) 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 (2.00 ± 0.96)x10^53 erg, the isotropic peak luminosity L_iso to (3.04 ± 0.14)x10^53 erg/s, the rest-frame peak energy Ep,i,z to (670 ± 60) keV. With the obtained estimates, GRB 240825A is inside 68% prediction bands for both 'Amati' and '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/GRB240825_T57185/GRB240825A_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/37302. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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