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

[vsnet-grb-info 37356] GRB 250215A: Swift/UVOT Upper Limits
by GCN Circulars 16 Feb '25

16 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39345 SUBJECT: GRB 250215A: Swift/UVOT Upper Limits DATE: 25/02/16 15:30:21 GMT FROM: Mike Siegel at PSU/Swift MOC <mhs18(a)psu.edu> M.H. Siegel (PSU) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 250215A detected by Fermi, the Einstein Probe and INTEGRAL (GCN Circ. 39327; Wang et al., GCN Circ. 39329; Barria et al., GCN Circ. 39331) 19.5 ks after the trigger. The afterglow reported in the XRT (Page et al., GCN Circ. 39336) and optical/IR (Liu et al., GCN Circ. 39330; Xie et al., GCN Cic. 39333; Malesani et al., GCN Circ. 39339) is not detected in the single U-band exposure. This is consistent with the redshift of z=4.61 reported by Sanchez-Ramirez et al. (GCN Circ. 39343). Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposure is: Filter T_start(s) T_stop(s) Exp(s) Mag u 9504 16104 1704 >21.06 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.056 in the direction of the burst (Schlegel et al. 1998). View this GCN Circular online at https://gcn.nasa.gov/circulars/39345. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37355] GRB 250215A: COLIBRÍ/DDRAGO Optical Upper Limits on the Afterglow
by GCN Circulars 16 Feb '25

16 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39344 SUBJECT: GRB 250215A: COLIBRÍ/DDRAGO Optical Upper Limits on the Afterglow DATE: 25/02/16 14:01:44 GMT FROM: Alan Watson at UNAM <alan(a)astro.unam.mx> Jean-Grégoire Ducoin (CPPM), Rosa L. Becerra (U Roma), Alan M. Watson (UNAM), Noémie Globus (UNAM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Dalya Akl (AUS), Camila Angulo (UNAM), Sarah Antier (OCA), Jean-Luc Atteia (IRAP), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Francis Fortin (IRAP), Kin Ocelotl López (UNAM), Francesco Magnani (CPPM), Margarita Pereyra (UNAM), Ny Avo Rakotondrainibe (LAM), and Benjamin Schneider (LAM) report: We imaged the field of GRB 250215A (Fermi GBM Team, GCN Circ. 39327, Barria et al., GCN Circ. 39331, Zheng et al., GCN Circ. 39335), originally detected as EP250215a (Wang et al., GCN Circ. 29329), with the DDRAGO wide-field imager on the COLIBRÍ telescope at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir in Mexico. We observed from 2025-02-16 05:37 UTC to 10:18 UTC (1.13 to 1.32 days after the trigger) and obtained 200 minutes of exposure in the r filter at high airmass. The data were coadded with the COLIBRÍ pipeline and analyzed in STDWeb/STDPipe (Karpov 2021), with photometric calibration against Pan-STARRS DR1 and image subtraction against Pan-STARRS DR2. Our photometry is not corrected for Galactic extinction. At the position of the OT reported by Liu et al. (GCN Circ. 39330), we do not detect a point source to an estimated 3-sigma upper limit of r > 22.7 Our non-detection is in contrast to the slightly earlier detection at i ≈ 21.3 reported by Malesani et al. (GCN Circ. 39341). In retrospect, this is not unexpected, given the bandpass of our filter from 553-695 nm and the presence of Ly-alpha absorption below 682 nm due to the source redshift of 4.61 (Ramírez-Sánchez et al., GCN Circ. 39343). Our limiting magnitude is consistent with the limit in r reported by Liu et al. (GCN Circ. 39327), assuming a temporal decay index of approximately 0.9, estimated from the Gemini and NOT detections in i reported by Malesani et al. (GCN Circ. 39339 and 39341). We warmly thank the COLIBRÍ and DDRAGO engineering teams and the staff of the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir. View this GCN Circular online at https://gcn.nasa.gov/circulars/39344. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37354] EP250215a / GRB 250215A : GTC redshift z = 4.61
by GCN Circulars 16 Feb '25

16 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39343 SUBJECT: EP250215a / GRB 250215A : GTC redshift z = 4.61 DATE: 25/02/16 11:58:30 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct(a)iaa.es> R. Sanchez-Ramirez, A. J. Castro-Tirado, M. D. Caballero-Garcia, S. Guziy, G. Garcia-Segura, I. Perez-Garcia and S.-Y. Wu (IAA-CSIC), M. Gritsevich (Univ. of Helsinki), D. Xu (NOAC), A. Martin-Carrillo (UCD), Y.-D. Hu (GXU), S.B. Pandey (UPSO), S. Geier and A. Cabrera-Lavers (GTC), on behalf of a larger collaboration, report: Following the detection of EP250215a/GRB250215A by EP/WXT (Wang et al. GCNC 39329), INTEGRAL/SPI-ACS (Barria et al. GCNC 39331), AstroSat CZTI (Tembhurnikar et al. GCNC 39334) SVOM/GRM (Zheng et al., GCN 39335) and Fermi/GBM (Scotton and Meegan, GCNC 39342), we triggered the 10.4m GTC in Observatorio del Roque de Los Muchachos (La Palma, Spain) in order to get an spectrum of the proposed optical afterglow detected by NOT (Liu et al., GCNC 39330, Malesani et al., GCNC 39341), SVOM/VT (Xie et al., GCN 39333) and Gemini-South (Malesani et al., GCNC 39339). Data was gathered starting on Feb 16, 2:27 UT (i.e. 23.9 hr post- burst), consisting of 4x1000s spectra with the R1000R grism, covering the range 5,200-10,000. Based on a preliminary reduction, we detect a prominent Ly-alpha absoption at ~6820A, plus several metal features interpreted as being due to SiII, CII, SiIV and CIV at a redshift of z = 4.61, wich we proposed to be the redshift of EP250215a/GRB250215A. View this GCN Circular online at https://gcn.nasa.gov/circulars/39343. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37353] GRB 250215A: Fermi GBM Observation
by GCN Circulars 16 Feb '25

16 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39342 SUBJECT: GRB 250215A: Fermi GBM Observation DATE: 25/02/16 07:17:46 GMT FROM: Lorenzo Scotton at UAH <lscottongcn(a)outlook.com> L. Scotton (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 02:31:54.94 UT on 15 February 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250215A (trigger 761279519/250215105), which was also detected by EP-WXT and FXT (Wang et al., GCN 39329), INTEGRAL SPI-ACS (Barria et al., GCN 39331), AstroSat CZTI (Tembhurnikar et al., GCN 39334), SVOM/GRM (Zheng et al., GCN 39335) and Swift-XRT (Page et al., GCN 39336). NOT (Liu et al., GCN 39330, Malesani et al., GCN 39341), SVOM/VT (Xie et al., GCN 39333) and Gemini-South (Malesani et al., GCN 39339) detected the optical counterpart. The Fermi GBM on-ground location is consistent with the Swift-XRT position. The angle from the Fermi LAT boresight is 28 degrees. The GBM light curve consists of multiple emission episodes with a duration (T90) of about 13.4 s (50-300 keV). The time-averaged spectrum from T0-0.8 to T0+14.5 s is best fit by a Band function with Epeak = 117 +/- 9 keV, alpha = -0.68 +/- 0.09 and beta = -2.38 +/- 0.14. The event fluence (10-1000 keV) in this time interval is (6.2 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+12 s in the 10-1000 keV band is 11.1 +/- 0.3 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/39342. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37352] EP250215a / GRB 250215A : NOT optical observations
by GCN Circulars 16 Feb '25

16 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39341 SUBJECT: EP250215a / GRB 250215A : NOT optical observations DATE: 25/02/16 03:06:15 GMT FROM: Daniele B. Malesani at IMAPP / Radboud University <d.malesani(a)astro.ru.nl> D. B. Malesani (DAWN/NBI and Radboud Univ), D. Xu (NAOC), N. Pyykkinen (NOT and Turku Univ.), M. A. Diaz Teodori (NOT and Turku Univ.) report on behalf of a larger collaboration: We observed the optical counterpart (Liu et al., GCN 39330; Xie et al., GCN 39333; Malesani et al., GCN 39339) of EP250215a / GRB 250215A (Wang et al., GCN 39329; Fermi GBM Team, GCN 39327; Barria et al., GCN 39331; Tembhurnikar et al., GCN 39334; Zheng et al., GCN 39335) using the ALFOSC instrument installed on the Nordic Optical Telescope (NOT). Observations were carried out in the i band and consisted of 5x300 s exposures, with a mean epoch 2025 Feb 16.076 UT (23.29 hr after the trigger). The afterglow is well detected with a magnitude i = 21.34 +- 0.07 AB, calibrated against several stars from the Pan-STARRS catalog. View this GCN Circular online at https://gcn.nasa.gov/circulars/39341. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37351] GRB 250215A/EP250215a: 1.6m Mephisto optical observation report
by GCN Circulars 15 Feb '25

15 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39340 SUBJECT: GRB 250215A/EP250215a: 1.6m Mephisto optical observation report DATE: 25/02/15 18:49:42 GMT FROM: Brajesh Kumar at SWIFAR, YNU <brajesh(a)ynu.edu.cn> Xiangkun Liu, Yu Pan, Edoardo P. Lagioia, Yaosong Yu, Guowang Du, Brajesh Kumar, Yuan Fang, Jinghua Zhang, Xinlei Chen, Xingzhu Zou, Yuanpei Yang (all SWIFAR, YNU), Xuhui Han, Pinpin Zhang, Liping Xin, Chao Wu, Jianyan Wei (all NAOC), Xiaowei Liu (SWIFAR, YNU) report on behalf of the Mephisto Team: The field of GRB 250215A/EP250215a detected by Fermi Gamma-ray Burst Monitor (GBM) and EP-WXT (Fermi GBM Team, GCN 39327; Wang et al., GCN 39329) was observed with the 1.6m Multi-channel Photometric Survey Telescope (Mephisto) of Yunnan University located at Lijiang Observatory. Simultaneous uvgr band photometric observations were conducted starting from 16:33:12 2025-02-15 UT (~14 hr after the trigger) and 3 frames with 300s exposure times were taken. There is non-detection of the optical candidate (Liu et al., GCN 39330; Xie et al., GCN 39333; Malesani et al., GCN 39339) in the stacked images of uvgr bands. The preliminary photometry and 3 sigma upper limits are listed below. Start_Time(UT) | Band | Exp(s)| LimMag (AB) --------------------|--------|-------|------------ 2025-02-15T16:33:12 | u | 300*3 | >20.65 2025-02-15T16:50:23 | v | 300*3 | >20.91 2025-02-15T16:33:12 | g | 300*3 | >21.21 2025-02-15T16:50:23 | r | 300*3 | >21.45 ------------------------------------------------------------------------------------------------- Mephisto (Multi-channel Photometric Survey Telescope) is a 1.6-m wide-field multi-channel telescope, the first of its type in the world, capable of imaging the same field of view in three optical bands simultaneously. It provides real-time, high-quality colors of stellar objects. The on-site telescope assemblage and commissioning were carried out in September 2022. The first light in all three channels was achieved on 2023 December 21. ------------------------------------------------------------------------------------------------- View this GCN Circular online at https://gcn.nasa.gov/circulars/39340. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37350] GRB 250215A / EP250215a: Gemini-South optical observation of a likely rebrightening
by GCN Circulars 15 Feb '25

15 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39339 SUBJECT: GRB 250215A / EP250215a: Gemini-South optical observation of a likely rebrightening DATE: 25/02/15 17:52:20 GMT FROM: mariaedvige.ravasio(a)ru.nl Daniele B. Malesani (DAWN/NBI and Radboud Univ.), Jonathan Quirola-Vasquez (Radboud Univ.), Antonio Martin-Carrillo (UCD), Andrew J. Levan (Radboud Univ. and Warwick Univ.), Maria E. Ravasio (Radboud and INAF), Peter G. Jonker (Radboud Univ.) report on behalf of a larger collaboration: We observed the optical counterpart (Liu et al., GCN 39330; Xie et al., GCN 39333) of EP250215a / GRB 250215A (Fermi GBM Team, GCN 39327; Wang et al., GCN 39329; Barria et al., GCN 39331; Tembhurnikar et al., GCN 39334; Zheng et al., GCN 39335) using the GMOS instrument installed on the Gemini-South telescope. While no spectroscopy could be unfortunately performed due to a technical fault with the instrument, in a single 60-s i-band image, taken starting on 2025 Feb 15 at 08:48:23 UT (6.27 hr after the EP/WXT trigger), the afterglow is well detected with a magnitude i = 20.05 +- 0.07 AB (calibrated against nearby stars from the Pan-STARRS catalog). We note that our (i-band) magnitude is brighter than the z-band measurement reported at an earlier epoch by Liu et al. (GCN 39330). The VT_R magnitude (Xie et al., GCN 39333), taken at an intermediate epoch, is brighter than both other reports. This is likely to indicate a rebrightening. View this GCN Circular online at https://gcn.nasa.gov/circulars/39339. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37349] LIGO/Virgo/KAGRA S250206dm: MASTER LC AT2025bbo
by GCN Circulars 15 Feb '25

15 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39338 SUBJECT: LIGO/Virgo/KAGRA S250206dm: MASTER LC AT2025bbo DATE: 25/02/15 17:47:56 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, N.Tiurina, D.Vlasenko, P.Balanutsa, I.Panchenko, A.Chasovnikov K.Zhirkov, G.Antipov, A.Sankovich, I.Gorbunov, A.Sosnovskij, Yu.Tselik, Ya.Kechin, V.Senik, V.Topolev (Lomonosov MSU), O.Gress, N.Budnev, O.Ershova (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), D.Buckley (SAAO), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), 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) Global MASTER robotic net (Lipunov, Kornilov, Gorbovskoy, Tiurina & Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591, pp.http://www.pereplet.ru/lipunov/625.html#625) continued to observe OT AT2025bbo (Smart et al., GCN 39244) in GW LVK error area S250206dm (The LIGO-Virgo-Kagra Collaboration, GCN 39175): Date UT Exp Filter Site m err 250208 15:31:43 95 Clear MASTER600-Tunka >19.3 250209 16:54:16 1440 ~Rc MASTER-Kislovodsk 19.10 0.15 250209 18:25:58 3960 ~Rc MASTER-Kislovodsk 19.48 0.05 250210 16:30:06 2880 ~Rc MASTER-Kislovodsk 19.86 0.06 250212 16:02:30 3960 ~Rc MASTER-Kislovodsk >20.1 We did not see any variability in ATboo galaxy on arhive images. The galaxy arhive light curve from 2010 year is available at http://www.pereplet.ru/lipunov/images/ATbbo_galaxy_arhive_midi.jpg View this GCN Circular online at https://gcn.nasa.gov/circulars/39338. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37348] LIGO/Virgo/KAGRA S250206dm: MASTER LC AT2025bbo
by GCN Circulars 15 Feb '25

15 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39338 SUBJECT: LIGO/Virgo/KAGRA S250206dm: MASTER LC AT2025bbo DATE: 25/02/15 17:47:56 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, N.Tiurina, D.Vlasenko, P.Balanutsa, I.Panchenko, A.Chasovnikov K.Zhirkov, G.Antipov, A.Sankovich, I.Gorbunov, A.Sosnovskij, Yu.Tselik, Ya.Kechin, V.Senik, V.Topolev (Lomonosov MSU), O.Gress, N.Budnev, O.Ershova (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), D.Buckley (SAAO), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), 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) Global MASTER robotic net (Lipunov, Kornilov, Gorbovskoy, Tiurina & Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591, pp.http://www.pereplet.ru/lipunov/625.html#625) continued to observe OT AT2025bbo (Smart et al., GCN 39244) in GW LVK error area S250206dm (The LIGO-Virgo-Kagra Collaboration, GCN 39175): Date UT Exp Filter Site m err 250208 15:31:43 95 Clear MASTER600-Tunka >19.3 250209 16:54:16 1440 ~Rc MASTER-Kislovodsk 19.10 0.15 250209 18:25:58 3960 ~Rc MASTER-Kislovodsk 19.48 0.05 250210 16:30:06 2880 ~Rc MASTER-Kislovodsk 19.86 0.06 250212 16:02:30 3960 ~Rc MASTER-Kislovodsk >20.1 We did not see any variability in ATboo galaxy on arhive images. The galaxy arhive light curve from 2010 year is available at http://www.pereplet.ru/lipunov/images/ATbbo_galaxy_arhive_midi.jpg View this GCN Circular online at https://gcn.nasa.gov/circulars/39338. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37347] GRB 250213A: COLIBRÍ/DDRAGO Optical Upper Limits on the Afterglow
by GCN Circulars 15 Feb '25

15 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39337 SUBJECT: GRB 250213A: COLIBRÍ/DDRAGO Optical Upper Limits on the Afterglow DATE: 25/02/15 15:02:48 GMT FROM: Alan Watson at UNAM <alan(a)astro.unam.mx> Jean-Grégoire Ducoin (CPPM), Alan M. Watson (UNAM), Rosa L. Becerra (U Roma), Jean-Luc Atteia (IRAP), Benjamin Schneider (LAM) Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Dalya Akl (AUS), Camila Angulo (UNAM), Sarah Antier (OCA), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Francis Fortin (IRAP), Noémie Globus (UNAM), Kin Ocelotl López (UNAM), Francesco Magnani (CPPM), Margarita Pereyra (UNAM), and Ny Avo Rakotondrainibe (LAM) report: We imaged the field of the SVOM/ECLAIRs GRB 250213A (Wang et al., GCN Circ. 39317) with the DDRAGO wide-field imager on the COLIBRÍ telescope at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir in Mexico. We observed from 2025-02-15 02:22 UTC to 09:19 UTC (T+1.11 to T+1.40 days after the trigger) and obtained 229 minutes of exposure in the r filter under very poor seeing conditions. The data were coadded with the COLIBRÍ pipeline and analyzed in STDWeb/STDPipe (Karpov 2021), with photometric calibration against Pan-STARRS DR1 and image subtraction against Pan-STARRS DR2. Our field includes the position of the SVOM/VT optical afterglow candidate (Xin et al., GCN Circ. 39325) and the X-ray sources #2 (consistent with the VT source) and #3 (consistent with the SVOM/ECLAIRs uncertainty) in the Swift/XRT ToO observations (Evans et al., GCN Circ. 39321). At the position of the SVOM/VT optical candidate, after image subtraction, we do not detect a point source to a 3-sigma limit of: r > 22.8 Within the uncertainty region of XRT source #3, we do not detect any point sources to a 3-sigma limit of: r > 22.5 Our magnitude limits are not corrected for the substantial Galactic extinction in the direction of this burst, estimated to be A_V = 2.46 or A_r = 2.05 (Schlafly & Finkbeiner, 2011). We warmly thank the COLIBRÍ and DDRAGO engineering teams and the staff of the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir. View this GCN Circular online at https://gcn.nasa.gov/circulars/39337. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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