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[vsnet-grb-info 43017] IPN triangulation of GRB 260601B / EP260601a
by GCN Circulars 09 Jun '26

09 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44884 SUBJECT: IPN triangulation of GRB 260601B / EP260601a DATE: 26/06/09 12:41:20 GMT FROM: Dmitry Svinkin at Ioffe Institute <svinkin(a)mail.ioffe.ru> D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, Chen-Wei Wang (IHEP), Shao-Lin Xiong (IHEP), Shuang-Nan Zhang (IHEP) on behalf of the Insight-HXMT team, Zheng-Hang Yu, Chen-Wei Wang, Shao-Lin Xiong, Chao Zheng, Cheng-Kui Li (IHEP) on behalf of GECAM team, E. Burns on behalf of the IPN, S. Sugita, A. Yoshida, T. Sakamoto, Y. Kawakubo (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena) on behalf of the CALET collaboration, A. Arya (IITB), G. Waratkar (Caltech/IITB), V. Bhalerao (IITB) on behalf of AstroSat/CZTI team, report: The long-duration GRB 260601B (GECAM-B detection: Yu et al., GCN 44767; NuSTAR-ACS detection: Waratkar et al., GCN 44771; CALET-GBM detection: Sugita et al., GCN 44773; Insight-HXMT detection: Wang et al., GCN 44785; Glowbug detection: Cheung et al., GCN 44801; Konus-Wind detection: Ridnaia et al., GCN 44806; AstroSat-CZTI detection: Arya et al., GCN 44839) was detected by GECAM-B, NuSTAR (ACS), CALET (GBM trigger 1464376270), Insight-HXMT (HE), Glowbug, AstroSat (CZTI), and Konus-Wind, at about 69168 s UT (19:12:48). We have triangulated it to the 3 sigma IPN localization region whose area is 55 sq. deg, and its maximum dimension is 39 deg (the minimum one is 1.3 deg). The fast X-ray transient EP260601a (Yang et al., GCN 44766) is inside the IPN localization strengthen the association of the transient and GRB 260601B. A triangulation map and HEALPix FITS files are posted at http://www.ioffe.ru/LEA/GRBs/GRB260601_T69173/IPN/ The HEALPix triangulation map is the multi-order HEALPix in units of probability density. View this GCN Circular online at https://gcn.nasa.gov/circulars/44884. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43016] GRB 260604C: SVOM/ECLAIRs refined analysis
by GCN Circulars 09 Jun '26

09 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44883 SUBJECT: GRB 260604C: SVOM/ECLAIRs refined analysis DATE: 26/06/09 11:58:07 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> M. Brunet, O. Godet (IRAP), N. Dagoneau, D. Gotz, D. Adrien, S. Bisero (CEA) report on behalf of the SVOM/ECLAIRs team: Using the event-by-event data downloaded through the X-band ground station, we report further analysis of SVOM/ECLAIRs observations of GRB 260604C (SVOM burst-id sb26060404 – GCN 44823, trigger time T0 = 2026-06-04T20:21:59 UTC), which was also detected by Fermi/GBM (GCN 44822, 44831) and GECAM-B (GCN 44854). The burst that triggered ECLAIRs onboard shows a multiple peak lightcurve. The burst duration is estimated to be around 255 s in the 4-20 keV energy band through imaging. The refined burst localization is RA, Dec = 224.396, 28.742 degrees: RA (J2000) = 14h57m35.0s Dec (J2000) = 28d44m31.2s with a 90% C.L. radius of 8.6 arcmin (including systematic error of 2 arcmin added in quadrature). This localization is consistent with the one of the afterglow (MASTER OT detection, GCN 44827). The time-averaged spectrum, before the slew (from T0-56.3 s to T0+41.9 s) in the 5-120 keV energy range is best fitted by a powerlaw model with alpha = -2.02 +0.17/-0.19. With this model, the 4-120 keV fluence is (4.5 +0.5/-1.3)e-7 erg/cm² and the 4-120 keV photon flux is 0.21 +0.01/-0.05 ph/cm²/s. The time-averaged spectrum after the slew (from T0+100 s to T0+200 s) in the 5-120 keV energy range is best fitted by a powerlaw model with alpha = -2.09 +0.35/-0.48. With this model, the 4-120 keV fluence is (2.2 +0.2/-1.3 )e-7 erg/cm² and the 4-120 keV photon flux is 0.10 +0.01/-0.05 ph/cm²/s. Fermi/GBM trigger occurred at T0-195 s at a time when ECLAIRs was not collecting data. So ECLAIRs missed the main part of the burst prompt emission. The spectral parameters we obtained may indicate that ECLAIRs observed the transition from the prompt to afterglow emission. All the quoted errors are at the 68% confidence level. The Space-based multi-band astronomical 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. ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC. The SVOM/ECLAIRs point of contact for this burst is: M. Brunet (IRAP) (marius.brunet at utoulouse.fr) View this GCN Circular online at https://gcn.nasa.gov/circulars/44883. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43015] GRB 260608A: SVOM/ECLAIRs refined analysis
by GCN Circulars 09 Jun '26

09 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44882 SUBJECT: GRB 260608A: SVOM/ECLAIRs refined analysis DATE: 26/06/09 11:54:47 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> M. Brunet, L. Bouchet (IRAP), C.-W. Wang (IHEP) D.-F. Kong (GXU) report on behalf of the SVOM/ECLAIRs team: Using the event-by-event data downloaded through the X-band ground station, we report further analysis of SVOM/ECLAIRs observations of GRB 260608A (SVOM burst-id sb260608A – GCN 44870, trigger time T0 = 2026-06-08T11:35:32 UTC), which was also detected by Fermi/GBM (GCN 44868). The burst that triggered ECLAIRs onboard shows a multiple peak lightcurve. The burst duration is T90 = 57.4 +3.8/-2.6 s in the 4-120 keV energy band. The time-averaged spectrum from T0-5.2 s s to T0+52.0 s in the 5-120 keV energy range is best fitted by a powerlaw model with alpha = -1.51 +/- 0.04. With this model, the 4-120 keV fluence is (3.1 +/- 0.1)e-6 erg/cm^2 and the 4-120 keV photon flux is 1.55 +/- 0.04 ph/cm^2/s. All the quoted errors are at the 68% confidence level. The Space-based multi-band astronomical 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. ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC. The SVOM/ECLAIRs point of contact for this burst is: Marius Brunet (IRAP) (marius.brunet at utoulouse.fr) View this GCN Circular online at https://gcn.nasa.gov/circulars/44882. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43014] Konus-Wind detection of GRB 260607B
by GCN Circulars 09 Jun '26

09 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44881 SUBJECT: Konus-Wind detection of GRB 260607B DATE: 26/06/09 11:26:57 GMT FROM: Anna Ridnaia at Ioffe Institute <ridnaia(a)mail.ioffe.ru> A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration GRB 260607B (Fermi-GBM detection: Fermi-GBM team, GCN 44859; Neights & Palafox, GCN 44861; Fermi-LAT detection: Holzmann Airasca et al., GCN 44860; AstroSat CZTI detection: Harsha et al., GCN 44871; GECAM-B detection: Wang et al., GCN 44880) triggered Konus-Wind at T0=47968.353 s UT (13:19:28.353). The burst light curve shows a bright multipeaked structure which starts at ~T0-6.8 s and ends at ~T0+50 s, which is followed by a weaker decaying emission with a 'bump' around ~T0+190 s. The total duration of the burst is ~209.8 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/GRB260607_T47968/ As observed by Konus-Wind, the burst had the total fluence of 4.55(-0.09,+0.09)x10^-4 erg/cm2, and the 64-ms peak flux, measured from T0+29.456 s, of 3.33(-0.27,+0.27)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+57.600 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.88(-0.02,+0.02), the high energy photon index beta = -2.87(-0.14,+0.11), the peak energy Ep = 622(-15,+16) keV (chi2 = 103/97 dof). The spectrum near the maximum count rate (measured from T0+29.184 to T0+30.720 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.74(-0.06,+0.06), the high energy photon index beta = -2.80(-0.37,+0.22), the peak energy Ep = 686(-51,+55) keV (chi2 = 48/62 dof). All the quoted errors are at the 68% confidence level. All the quoted values are preliminary. View this GCN Circular online at https://gcn.nasa.gov/circulars/44881. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43013] GRB 260607B: GECAM-B observation
by GCN Circulars 09 Jun '26

09 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44880 SUBJECT: GRB 260607B: GECAM-B observation DATE: 26/06/09 05:54:44 GMT FROM: Yue Wang <m18509381757(a)163.com> Yue Wang, Chen-Wei Wang, Shao-Lin Xiong (IHEP) report on behalf of GECAM team: GECAM-B was triggered in-flight by GRB 260607B at 2026-06-07T13:19:30.100 UTC (denoted as T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #44859) and Feimi/LAT (Airasca et. al., GCN #44860). According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of muplti-pulses with a duration (T90) of 46.3 +0.1/-0.1 s. The GECAM-B light curve can be found here: https://www.bursthub.cn//admin/static/gecambgrb260607B.png Using the localization reported by Fermi/LAT (Ra = 54.68 deg, Dec = 30.45 deg, Err = 0.40 deg, GCN #44860) , the time-averaged spectrum from T0-0 s to T0+55 s is best fitted by a power law function with an exponential high-energy cutoff. The power law index is -1.03 +0.03/-0.03 and the cutoff energy, parameterized as Epeak, is 768 +49/-45 keV. The event fluence (10-1000 keV) in this time interval is (3.09 +/-0.03)E-04 erg/cm^2. The 'Amati' relation diagram of GRB 260607B is shown at: https://www.bursthub.cn//admin/static/gecambgrb260607B_amati.png Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission originally consists of two micro-satellites (GECAM-A and GECAM-B) launched in Dec. 2020. As the third member of GECAM constellation, GECAM-C was launched onboard SATech-01 experimental satellite in July 2022. GECAM mission is funded by the Chinese Academy of Sciences (CAS). View this GCN Circular online at https://gcn.nasa.gov/circulars/44880. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43012] GRB 260608C: Fermi GBM Final Real-time Localization
by GCN Circulars 09 Jun '26

09 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44879 SUBJECT: GRB 260608C: Fermi GBM Final Real-time Localization DATE: 26/06/09 00:09:29 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 23:54:23 UT on 8 Jun 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260608C (trigger 802655668.086186 / 260608996). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 245.4, Dec = 47.8 (J2000 degrees, equivalent to J2000 16h 21m, 47d 47'), with a statistical uncertainty of 9.6 degrees. The angle from the Fermi LAT boresight is 122.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260608996/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260608996/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260608996/… View this GCN Circular online at https://gcn.nasa.gov/circulars/44879. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43011] GRB 260608C: Fermi GBM Final Real-time Localization
by GCN Circulars 09 Jun '26

09 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44878 SUBJECT: GRB 260608C: Fermi GBM Final Real-time Localization DATE: 26/06/09 00:06:51 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 23:54:23 UT on 8 Jun 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260608C (trigger 802655668.086186 / 260608996). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 245.4, Dec = 47.8 (J2000 degrees, equivalent to J2000 16h 21m, 47d 47'), with a statistical uncertainty of 9.6 degrees. The angle from the Fermi LAT boresight is 122.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260608996/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260608996/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260608996/… View this GCN Circular online at https://gcn.nasa.gov/circulars/44878. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43010] GRB 260604C: further SAO RAS optical observations
by GCN Circulars 08 Jun '26

08 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44877 SUBJECT: GRB 260604C: further SAO RAS optical observations DATE: 26/06/08 22:27:43 GMT FROM: Alexander Moskvitin at SAO RAS <mosk(a)sao.ru> A. Moskvitin (SAO RAS), O. Spiridonova (SAO RAS), A. Pozanenko (IKI), A. Volnova (IKI), N. Pankov (IKI) report on behalf of GRB follow-up team We observed the field of long GRB 260604C discovered by Fermi (The Fermi GBM team, GCN 44822; Neights & Meegan, GCN 44831); SVOM (Gotz et al., GCN 44823) and GECAM-B (Luo et al., GCN 44854) with the Zeiss-1000 1-m telescope of SAO RAS equipped with the CCD photometer. We obtained 12 x 300 sec. images in Rc band on June 08, 20:01:14--21:07:58 UT. The OT (Lipunov, GCN 44827; Konno et al., GCN 44828; GCN 44836; Zhu et al., GCN 44832; Becerra et al., GCN 44834; Hellot et al., GCN 44835; Gompertz et al., GCN 44837; Gompertz et al., GCN 44843; Chen et al., GCN 44851; Moskvitin et al., GCN 44852; Sasaki et al., GCN 44857; Pankov et al., GCN 44858; Pankov et al., GCN 44862; Burkhonov et al., GCN 44865; Lincetto et al., GCN 44873) is detected in our stacked image with the following brightness: Date UTstart t-T0 Exp. Filter Mag +/- Err. UL (mid,d) (n*s) (3-sigma) 2026.06.08 20:01:14 4.01102 12*300 Rc 23.08 +/- 0.18 23.8 The preliminary photometry is based on nearby SDSS stars (R-magnitudes were obtained using Lupton 2005 transformation equations) as in Moskvitin et al., GCN 44852, and was not corrected for the Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/44877. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43009] GRB 260607A: AT2026ong (GOTO26fqf) is a type-Ia SN
by GCN Circulars 08 Jun '26

08 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44876 SUBJECT: GRB 260607A: AT2026ong (GOTO26fqf) is a type-Ia SN DATE: 26/06/08 18:46:23 GMT FROM: Daniele Bjørn Malesani at Cosmic Dawn Center, Niels Bohr Institute <daniele.malesani(a)nbi.ku.dk> G. Corcoran (UCD), L. Izzo (INAF/OAC and DARK/NBI), B. Schneider (LAM), J. An (NAOC), B. P. Gompertz (Birmingham), V. Abril-Melgarejo (LUX-Paris Obs.), D. B. Malesani (DAWN/NBI and Radboud) report on behalf of the Stargate collaboration: We observed the transient AT2026ong (GOTO26fqf; Gompertz et al., GCN 44864; He et al., GCN 44866; Lincetto et al., GCN 44875), proposed to be associated with the Fermi GBM GRB 260607A (Fermi GBM team, GCN 44855) using the ESO Very Large Telescope (VLT) UT3 (Melipal) equipped with the X-shooter telescope. Our spectra cover the wavelength range 3000-25000 AA, and consist of 2 exposures of 600 s each. The observation mid time was 2026 Jun 8.40 UT (20.87 hr after the GRB). In the acquisition image, we measure an AB magnitude r = 19.49 +- 0.03 (calibrated against Pan-STARRS, not corrected for Galactic extinction). The slit also covers the galaxy just east of the transient (Gompertz et al., GCN 44864), its likely host galaxy. From detection of multiple emission (Halpha, [N II], [S II]) and absorption (Ca II, G band) features, we measure for the galaxy a redshift of z = 0.111. The spectrum of the transient reveals a clear continuum with broad undulations across the entire optical range, markedly different from GRB afterglow spectra. Template matching via SNID-SAGE (Stoppa et al. 2026, doi:10.48550/arXiv.2603.28741) indicates a good agreement with a type-Ia SN, at a redshift consistent with the galaxy redshift. GOTO26fqf is thus not related to GRB 260607A and has been now named SN 2026ong. The UVB and VIS spectra of the transient are available via TNS at https://www.wis-tns.org/object/2026ong. We acknowledge excellent support from the ESO observing staff in Paranal, in particular Celia Desgrange and Francisco Caceres, for rapidly executing these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/44876. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43008] GRB 260607A / GOTO26fqf / AT2026ong: COLIBRÍ optical observations
by GCN Circulars 08 Jun '26

08 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44875 SUBJECT: GRB 260607A / GOTO26fqf / AT2026ong: COLIBRÍ optical observations DATE: 26/06/08 18:24:05 GMT FROM: Massimiliano Lincetto at Aix Marseille Univ, CNRS/IN2P3, CPPM <lincetto(a)cppm.in2p3.fr> Massimiliano Lincetto (CPPM), Leonardo García García (UNAM), Jean-Grégoire Ducoin (CPPM), Benjamin Schneider (LAM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Alan M. Watson (UNAM), Edilberto Aguilar-Ruiz (UNAM), Jean-Luc Atteia (IRAP), Camila Angulo (UNAM), Dalya Akl (NYUAD), Sarah Antier (IJCLAB), Rosa L. Becerra (UNAM), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Francis Fortin (IRAP), Ramandeep Gill (UNAM), Noémie Globus (UNAM), Marion Guelfand (CPPM), Asuka Kuwata (UNAM), Nikos Mandarakas (LAM), Diego López-Cámara (UNAM), Francesco Magnani (CPPM), Enrique Moreno Méndez (UNAM), Margarita Pereyra (UNAM), Ny Avo Rakotondrainibe (LAM), Fredd Sánchez Álvarez (UNAM) and Antonio de Ugarte Postigo (LAM) report: We imaged the candidate optical counterpart GOTO26fqf / AT2026ong (Gompertz et al., GCN Circ. 44864) of the Fermi GRB 260607A (Fermi GBM, GCN Circ. 44855) using the DDRAGO two-channel wide-field imager on the COLIBRÍ telescope. We observed from 2026-06-08 09:42 to 09:58 UTC (23 hours after the trigger) and obtained 840 seconds of simultaneous exposure in the r/z filters. The data were reduced and coadded with the COLIBRÍ ASU pipeline and analysed in STDWeb/STDPipe (Karpov 2025). The photometry was calibrated using nearby stars from the PanSTARRS DR1 catalog, is in the AB system, and is not corrected for Galactic extinction. After subtracting template Pan-STARRS images, we detected the optical counterpart reported by Gompertz et al., GCN Circ. 44864, at preliminary magnitudes of: r = 19.72 +/- 0.01 z = 20.05 +/- 0.04 The measurement is consistent with a no-evolution scenario with reference to the GOTO measurement taken 14.7h after the trigger. The color r-z = -0.33 indicates a blue object, not consistent with typical GRB afterglows. We thank the staff of the Observatorio Astronómico Nacional at Sierra de San Pedro Mártir, as well as the technical and engineering teams at CEA, CPPM, IRAP, LAM, OHP, OSU Pytheas, and UNAM. COLIBRÍ is an astronomical observatory developed and operated jointly by France (AMU, CNES and CNRS) and Mexico (UNAM and SECIHTI). It is located at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir, Baja California, Mexico. View this GCN Circular online at https://gcn.nasa.gov/circulars/44875. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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