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

[vsnet-grb-info 40983] GRB 251127A: SVOM/GRM observation
by GCN Circulars 01 Dec '25

01 Dec '25

TITLE: GCN CIRCULAR NUMBER: 42911 SUBJECT: GRB 251127A: SVOM/GRM observation DATE: 25/12/01 02:08:58 GMT FROM: Chenwei Wang at IHEP <cwwang(a)ihep.ac.cn> SVOM/GRM team: Chen-Wei Wang, Zheng-Hang Yu, Yue Huang, Shi-Jie Zheng, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) SVOM/ECLAIRs team: Jean-Luc Atteia (IRAP) Report on behalf of the SVOM team: SVOM/GRM was triggered in-flight by a burst GRB 251127A at 2025-11-27T03:17:44.000 UTC (T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #42852) and Glowbug (C.C. Cheung et al., GCN #42872). With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of mutiple peaks with a T90 of 17.5 +4.0/-2.5 s in the 15-5000 keV band. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb251127A.png In addition, the position of this burst, as determined by Fermi/GBM (RA= 155.6, DEC= 30.2, GCN#42852), is located at about 46 degrees from the SVOM optical axis, which is outside the ECLAIRs field of view. With this localization, the time-averaged spectrum from T0-2 to T0+18 s is best fitted by a power law function with an exponential high-energy cutoff. The power law index is -1.09 +0.22/-0.21 and the cutoff energy, parameterized as Epeak, is 267 +251/-77 keV. The event fluence (10-1000 keV) in this time interval is (1.05 +0.11/-0.11)E-05 erg/cm^2. The 1s peak spectrum, measured from T0-1 to T0 s, if fitted by a power law function with an exponential high-energy cutoff, the power law index is -1.01 +0.18/-0.16 and the cutoff energy, parameterized as Epeak, is 591 +503/-197 keV. The flux (10-1000 keV) in this time interval is (7.84 +0.88/-1.01)E-07 erg/cm^2/s. The localization of GRB 251127A in the 'Amati' relation diagram is shown at: https://www.bursthub.cn//admin/static/svgrb251127A_amati.png The localization of GRB 251127A in the 'Yonetoku' relation diagram is shown at: https://www.bursthub.cn//admin/static/svgrb251127A_yonetoku.png The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center 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. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS. The SVOM point of contact for this burst is: Chen-Wei Wang (IHEP)(cwwang(a)ihep.ac.cn) View this GCN Circular online at https://gcn.nasa.gov/circulars/42911. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40982] IceCube Alert 251130.75: Global MASTER-Net observations report
by GCN Circulars 30 Nov '25

30 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42910 SUBJECT: IceCube Alert 251130.75: Global MASTER-Net observations report DATE: 25/11/30 23:13:22 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-Tunka robotic telescope [1] located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the IceCube Alert 251130.75 (trigger No 31953389,15h 18m 58.08s , -05d 39m 25.2s, R=0.95) errorbox 18825 sec after notice time and 18880 sec after trigger time at 2025-11-30 23:08:10 UT, with upper limit up to 15.1 mag. Observations started at twilight. The observations began at zenith distance = 82 deg. The sun altitude is -14.8 deg. The galactic latitude b = 41 deg., longitude l = 356 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3056129 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 18910 | 2025-11-30 23:08:10 | MASTER-Tunka | (15h 18m 34.03s , -05d 47m 52.8s) | C | 60 | 14.5 | 18910 | 2025-11-30 23:08:10 | MASTER-Tunka | (15h 18m 53.09s , -05d 55m 00.3s) | C | 60 | 15.1 | 18984 | 2025-11-30 23:09:24 | MASTER-Tunka | (15h 18m 39.40s , -05d 48m 55.2s) | C | 60 | 14.3 | 18984 | 2025-11-30 23:09:24 | MASTER-Tunka | (15h 18m 58.71s , -05d 56m 07.2s) | C | 60 | 15.0 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/42910. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40981] IceCube-251130A - IceCube observation of a high-energy neutrino candidate track-like event
by GCN Circulars 30 Nov '25

30 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42909 SUBJECT: IceCube-251130A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 25/11/30 19:37:39 GMT FROM: A. Zegarelli at Ruhr University Bochum <azegarelli(a)icecube.wisc.edu> The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 25-11-30 at 17:53:30.69 UT IceCube detected a track-like event with a high probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_GOLD alert stream. The average astrophysical neutrino purity for Gold alerts is 50%. This alert has an estimated false alarm rate of 1.1099 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/141654_31953389.amon) more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 25-11-30 Time: 17:53:30.69 UT RA: 229.7 (+0.53/-0.52 deg 90% PSF containment) J2000 Dec: -5.53 (+0.58/-0.6 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/42909. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40980] EP251130a: Swift-XRT counterpart detection
by GCN Circulars 30 Nov '25

30 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42908 SUBJECT: EP251130a: Swift-XRT counterpart detection DATE: 25/11/30 19:00:56 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> P.A. Evans (U. Leicester), J.A. Kennea (PSU), E. Ambrosi (INAF-IASFPA) , A.P. Beardmore (U. Leicester), M.G. Bernardini (INAF-OAB), R. Brivio (INAF-OAB), D.N. Burrows (PSU), S. Campana (INAF-OAB), M. Capalbi (INAF-OAR), A. D'Ai (INAF-IASFPA), P. D'Avanzo (INAF-OAB), V. D'Elia (SSDC & INAF-OAR), S. Dichiara (PSU), M. Ferro (INAF-OAB), A. Melandri (INAF-OAR), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M. Perri (SSDC & INAF-OAR), C. Salvaggio (INAF-OAB), T. Sbarrato (INAF-OAB), B. Sbarufatti (INAF-OAB), M.A. Williams (PSU) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Einstein Probe/WXT-detected source EP251130a, collecting 2.0 ks of Photon Counting (PC) mode data between T0+5.8 ks and T0+11 ks after the trigger. A likely counterpart has been found. The details of this source are: Source 1 (SWIFT J064404.8+272302): ================================== RA (J2000.0): 101.0203 = 06 44 04.87 Dec (J2000.0): +27.3839 = +27 23 02.0 Error: 3.9 (arcsec, radius, 90% confidence). Detect flag: GOOD Distance: 75 arcsec from the Einstein Probe/WXT position. Mean rate: 0.0618 [+0.0070, -0.0068] ct s^-1 Mean flux: (2.21 [+0.25, -0.24])e-12 erg cm^-2 s^-1 Peak rate: 0.139 +/- 0.031 ct s^-1 Peak flux: (5.0 +/- 1.1)e-12 erg cm^-2 s^-1 ECF: 3.57e-11 erg cm^-2 ct^-1 assuming NH=1.80e+21 cm^-2, gamma=1.97 determined from a spectral fit. XMM UL: 3.5e-12 erg cm^-2 s^-1, (0.3-10 keV) so the source is 1.4-sigma above this 3-sigma upper limit. The source may be fading, at the 2.6-sigma level. This position is consistent with the candidate optical counterpart reported by COLIBRI (GCN 42904). All fluxes are 0.3-10 keV, observed. For all flux conversions and comparisons with catalogues and upper limits from other missions, we assumed a power-law spectrum with NH=3x10^20 cm^-2 and photon index (Gamma)=1.7 unless otherwise stated. The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/EP/EP_FIELD00085. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/42908. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40979] GRB 251130B: Fermi GBM Final Localization Correction
by GCN Circulars 30 Nov '25

30 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42907 SUBJECT: GRB 251130B: Fermi GBM Final Localization Correction DATE: 25/11/30 18:45:22 GMT FROM: rhamburg(a)usra.edu The Fermi GBM team reports the detection of a likely LONG GRB "At 15:33:18.11 UT on 30 November 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251130B (trigger 786209603/251130648). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 78.82, Dec = -43.31 (J2000 degrees, equivalent to J2000 5h 15m, –43d 18'), with a statistical uncertainty of 1.74 degrees. The angle from the Fermi LAT boresight is 94 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251130648/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251130648/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251130648/…" View this GCN Circular online at https://gcn.nasa.gov/circulars/42907. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40978] GRB 251130B: Fermi GBM Final Localization Correction
by GCN Circulars 30 Nov '25

30 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42907 SUBJECT: GRB 251130B: Fermi GBM Final Localization Correction DATE: 25/11/30 18:45:22 GMT FROM: rhamburg(a)usra.edu The Fermi GBM team reports the detection of a likely LONG GRB "At 15:33:18.11 UT on 30 November 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251130B (trigger 786209603/251130648). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 78.82, Dec = -43.31 (J2000 degrees, equivalent to J2000 5h 15m, –43d 18'), with a statistical uncertainty of 1.74 degrees. The angle from the Fermi LAT boresight is 94 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251130648/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251130648/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251130648/…" View this GCN Circular online at https://gcn.nasa.gov/circulars/42907. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40977] GRB 251130B: Fermi GBM Final Localization Correction
by GCN Circulars 30 Nov '25

30 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42907 SUBJECT: GRB 251130B: Fermi GBM Final Localization Correction DATE: 25/11/30 18:45:22 GMT FROM: rhamburg(a)usra.edu The Fermi GBM team reports the detection of a likely LONG GRB "At 15:33:18.11 UT on 30 November 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251130B (trigger 786209603/251130648). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 78.82, Dec = -43.31 (J2000 degrees, equivalent to J2000 5h 15m, –43d 18'), with a statistical uncertainty of 1.74 degrees. The angle from the Fermi LAT boresight is 94 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251130648/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251130648/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251130648/…" View this GCN Circular online at https://gcn.nasa.gov/circulars/42907. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40976] EP251130a: Global MASTER-Net observations report
by GCN Circulars 30 Nov '25

30 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42906 SUBJECT: EP251130a: Global MASTER-Net observations report DATE: 25/11/30 16:45:38 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-Kislovodsk robotic telescope [1] located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the EP251130a ( EP Team et al., GCN 42903) errorbox 16211 sec after notice time and 19018 sec after trigger time at 2025-11-30 16:24:47 UT, with upper limit up to 15.3 mag. The observations began at zenith distance = 80 deg. The sun altitude is -30.0 deg. The galactic latitude b = 11 deg., longitude l = 188 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3055832 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 19048 | 2025-11-30 16:24:47 | MASTER-Kislovodsk | (06h 42m 49.31s , +27d 04m 35.5s) | C | 60 | 13.6 | 19048 | 2025-11-30 16:24:47 | MASTER-Kislovodsk | (06h 42m 50.47s , +27d 27m 17.4s) | C | 60 | 15.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/42906. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40975] GRB 251130B: Fermi GBM Final Real-time Localization
by GCN Circulars 30 Nov '25

30 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42905 SUBJECT: GRB 251130B: Fermi GBM Final Real-time Localization DATE: 25/11/30 15:43:48 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 15:33:18 UT on 30 Nov 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251130B (trigger 786209603.108754 / 251130648). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 102.1, Dec = -45.5 (J2000 degrees, equivalent to J2000 06h 48m, -45d 30'), with a statistical uncertainty of 11.5 degrees. The angle from the Fermi LAT boresight is 108.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251130648/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251130648/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251130648/… View this GCN Circular online at https://gcn.nasa.gov/circulars/42905. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40974] EP251030a: COLIBRÍ optical counterpart candidate
by GCN Circulars 30 Nov '25

30 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42904 SUBJECT: EP251030a: COLIBRÍ optical counterpart candidate DATE: 25/11/30 15:18:49 GMT FROM: Damien Dornic <ddornic(a)km3net.de> Damien Dornic (CPPM), Margarita Pereyra (UNAM), Stéphane Basa (UAR Pytheas), Rosa L. Becerra (UNAM), Alan M. Watson (UNAM), Jean-Luc Atteia (IRAP), Camila Angulo (UNAM), Dalya Akl (NYUAD), Sarah Antier (IJCLAB), Nathaniel R. Butler (ASU), Jean-Grégoire Ducoin (CPPM), Francis Fortin (IRAP), Leonardo García García (UNAM), William H. Lee (UNAM), Kin Ramandeep Gill (UNAM), Noémie Globus (UNAM), Ocelotl López (UNAM), Diego López-Cámara (UNAM), Nikos Mandarakas (LAM), Francesco Magnani (CPPM), Enrique Moreno Méndez (UNAM), Ny Avo Rakotondrainibe (LAM), Fredd Sánchez Álvarez (UNAM), Benjamin Schneider (LAM) and Antonio de Ugarte Postigo (LAM): We imaged the field of the EP251030a (Wu et al., GCN 42903) using the DDRAGO two-channel wide-field imager on the COLIBRÍ telescope. We observed from 2025-11-30T12:09:17 to 12:28 UTC (from 1.02 to 1.34 hours after the trigger) and obtained 16 minutes of simultaneous exposure in the r and z filters. The data were reduced, coadded and analysed with the COLIBRÍ pipeline. The photometry was calibrated using nearby stars from the PanSTARRS DR1 catalog, is in the AB system, and is not corrected for Galactic extinction. In the stacked image, we detect an uncatalogued source at the coordinates: RA = 101.0205 deg, Dec = 27.3840 deg with an uncertainty of 0.5 arcsec, compatible with the EP/FXT position (Wu et al., GCN 42903), at preliminary magnitudes of: r = 20.69 +/- 0.03 z = 19.45 +/- 0.03 We thank the staff of the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir and the COLIBRÍ and DDRAGO engineering teams. 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/42904. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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