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[vsnet-grb-info 43066] EP260610b: refined analysis of the EP-WXT and follow-up EP-FXT observations
by GCN Circulars 11 Jun '26

11 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44912 SUBJECT: EP260610b: refined analysis of the EP-WXT and follow-up EP-FXT observations DATE: 26/06/11 12:50:17 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> C. L. Guo, H. Y. Ren, Z. X. Ling (NAO, CAS), H.Z. Wu (HUST, CAS) on behalf of the Einstein Probe (EP) team: The fast X-ray transient EP260610b was detected by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission (Wu et al., GCN 44895), and followed by several telescopes (Levan et al. GCN 44897, Xin et al. GCN 44900, Zhu et al. GCN 44902, Burkhonov et al. GCN 44904, Méndez et al. GCN 44906). The WXT observation started at T0=2026-06-10 12:44:25 (UTC), and lasted for around 230 s before being interrupted by autonomous follow-up. The WXT light curve shows an increase in flux during the last 30 s. The average WXT 0.5–4 keV spectrum can be fitted with an absorbed power-law model with a fixed Galactic hydrogen column density of 2.43 × 10^20 cm^−2 and a photon index of 1.48 (+0.81/−0.70). The derived average unabsorbed 0.5–4 keV flux is 2.39 (+1.35/−0.90) × 10^−10 erg s^−1 cm^−2. The autonomous follow-up observation with the Follow-up X-ray Telescope (FXT) on board EP started at 2026-06-10 12:50:34 (UTC), about 370s after T0. The exposure time was approximately 3726s. The on-ground analysis of the FXT data detected an uncatalogued X-ray source at R.A. = 267.6268 deg, DEC = 46.5388 deg (J2000), with an uncertainty of 10 arcsec in radius (90% C.L., including statistical and systematic uncertainties). The average FXT 0.5–10 keV spectrum can be fitted with an absorbed power-law model with a fixed Galactic hydrogen column density of 2.43 × 10^20 cm^−2 and a photon index of 2.19 (+0.1/−0.1). The derived average unabsorbed 0.5–10 keV flux is 7.36 (+0.4/−0.4) × 10^−12 erg s^−1 cm^−2. The uncertainties quoted above are at the 90% confidence level. Launched on January 9, 2024, EP is a space X-ray observatory designed 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/44912. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43065] GRB 260610B / AT 2026owq: COLIBRÍ optical observations
by GCN Circulars 11 Jun '26

11 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44911 SUBJECT: GRB 260610B / AT 2026owq: COLIBRÍ optical observations DATE: 26/06/11 11:14:07 GMT FROM: Dalya Akl at New York University Abu Dhabi <dka2010(a)nyu.edu> GRB 260610B / AT 2026owq: COLIBRÍ optical observations Dalya Akl (NYUAD), Enrique Moreno Méndez (UNAM), Jean-Grégoire Ducoin (CPPM), Rosa L. Becerra (UNAM), Noémie Globus (UNAM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Edilberto Aguilar-Ruiz (UNAM), Jean-Luc Atteia (IRAP), Camila Angulo (UNAM), Sarah Antier (IJCLAB), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Francis Fortin (IRAP), Leonardo García García (UNAM), Ramandeep Gill (UNAM), Marion Guelfand (CPPM), Asuka Kuwata (UNAM), Massimiliano Lincetto (CPPM), Nikos Mandarakas (LAM), Diego López-Cámara (UNAM), Francesco Magnani (CPPM), Margarita Pereyra (UNAM), Ny Avo Rakotondrainibe (LAM), Fredd Sánchez Álvarez (UNAM), Benjamin Schneider (LAM) and Antonio de Ugarte Postigo (LAM) report: We imaged the field of GOTO26fua/AT2026owq (O'Neill et al., GCN Circ. 44904), a possible counterpart of the Fermi GBM GRB 260610B (Fermi GBM team, GCN Circ. 44901), using the DDRAGO two-channel wide-field imager on the COLIBRÍ telescope. We observed from 2026-06-11 06:51 to 08:13 UTC (from 7.08 to 8.45 hours after the GRB trigger) and obtained 15, 16, 15, 16, and 30 minutes, respectively, of exposure in the g, r, i, z, and y filters. The data were reduced, coadded, calibrated, and analysed with the COLIBRÍ pipeline. The photometry was calibrated using nearby stars from the PanSTARRS DR2 catalog, is in the AB system, and is not corrected for Galactic extinction. We detect the source AT2026owq with preliminary magnitudes of: g = 19.48 +/- 0.10 r = 19.02 +/- 0.03 i = 18.61 +/- 0.11 z = 18.54 +/- 0.08 y = 18.25 +/- 0.28 The absence of a strong break within our five filter measurements suggests a low-redshift event. Given the brightness, we encourage spectroscopic observations. Our values are consistent with those reported by GOTO (O'Neill et al., GCN Circ. 44903) and DDOTI (Watson et al., GCN Circ. 44905), given that the source continues to exhibit the same temporal decay reported by Watson et al. (GCN Circ. 44905), with a decay index of alpha ≈ -0.6. 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 México (UNAM and SECIHTI). It is located at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir, Baja California, México. View this GCN Circular online at https://gcn.nasa.gov/circulars/44911. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43064] GRB 260610B / AT2026owq: Early ATLAS observations
by GCN Circulars 11 Jun '26

11 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44910 SUBJECT: GRB 260610B / AT2026owq: Early ATLAS observations DATE: 26/06/11 11:00:56 GMT FROM: S. Srivastav at Oxford <shubhamsrivastav(a)gmail.com> J. H. Gillanders (Oxford), S. J. Smartt, K. W. Smith (Oxford, QUB), S. Srivastav, (Oxford), M. Nicholl, D. Young (QUB), T.-W. Chen (NCU, Taiwan), J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), M. R. Alarcón, J. Licandro, P. Nichita (IAC), D. R. Young, M. Nicholl, T. Moore, J. Weston, X. Sheng, C. R. Angus, A. Wilson, A. Aamer, D. Magill, P. J. Broda, A. J. Smith (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle, L. Eastman (Oxford), L. Rhodes (TSI/McGill), A. Rest (STScI), C. Stubbs (Harvard), J. S. Sommer (LMU), B. P. Schmidt (ANU) The ATLAS survey comprises 5 optical telescopes situated around the globe (Hawaii x2, Chile, South Africa, Tenerife) that are continuously observing the night sky with a cadence of ~12-36 hours (Tonry et al., 2018; Licandro et al., 2023, 2025). Each point of the sky is imaged 4 times across a ~1 hour period so as to identify nearby moving objects. This high-cadence set of observations can also provide tight explosion constraints on extragalactic phenomena, provided an ATLAS unit is serendipitously pointing at the explosion site. Here we report ATLAS-Teide (the Tenerife unit) observations of the optical counterpart (AT2026owq; discovered by GOTO; O’Neill et al., GCN 44903; see also Watson et al., GCN 44905 and Zhu et al., GCN 44909) to GRB 260610B (detected by Fermi/GBM; GCN 44901). ATLAS-Teide observed the sky location of AT2026owq four times on MJDs 61201.96762, 61201.98177, 61201.99593 and 61202.01008 as part of regular survey operations. Each exposure lasted 30s and was acquired with the wide w-band filter (described by Tonry et al., 2025). The first and second exposures returned 5-sigma upper limits of >20.20 and >20.35 AB mag, respectively. The third and fourth exposures detected the transient, with magnitudes of w = 16.26+/-0.02 and w = 16.29+/-0.02 AB mag, respectively. Fermi/GBM reported the detection time of GRB 260610B (GCN 44901) to be MJD 61201.99044. This means that our third exposure, in which we first detected AT2026owq, was obtained just 7.9 minutes post-explosion. Similarly, our second exposure provides an upper limit corresponding to 12.5 minutes pre-explosion. We further note that although a host association is not obvious, the location of GRB 260610B / AT2026owq is in the vicinity of a number of nearby (z ~ 0.1, or D ~ 400-500 Mpc) galaxies; as such, further follow-up is scheduled to quantify the evolution of this (possibly low-z) GRB. The Asteroid Terrestrial-impact Last Alert System (ATLAS) project is primarily funded to search for Near-Earth asteroids through NASA grants NN12AR55G, 80NSSC18K0284, and 80NSSC18K1575; byproducts of the NEO search include images and catalogs from the survey area. This work was partially funded by Kepler/K2 grant J1944/80NSSC19K0112 and HST GO-15889, and STFC grants ST/T000198/1 and ST/S006109/1. The ATLAS science products have been made possible through the contributions of the University of Hawaii Institute for Astronomy, University of Oxford, the Queen's University Belfast, the Space Telescope Science Institute, the South African Astronomical Observatory, and The Millennium Institute of Astrophysics (MAS), Chile. View this GCN Circular online at https://gcn.nasa.gov/circulars/44910. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43063] GRB 260610B: TRT optical observation
by GCN Circulars 11 Jun '26

11 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44909 SUBJECT: GRB 260610B: TRT optical observation DATE: 26/06/11 09:13:48 GMT FROM: Zipei Zhu at NAOC <zpzhu(a)nao.cas.cn> Z.-P. Zhu (NAOC), K. Noysena, K. Chanchaiworawit, S. Tinyanont (NARIT), J. An (NAOC), X. Liu, S.-Q. Jiang, L.-B. He, D. Xu (NAOC), S.-Y. Fu (HUST) report: We observed the field of GRB260610B detected by Fermi (Fermi GBM team, GCN 44901) , using the 0.7-m telescope of the Thai Robotic Telescope network (TRT), located at Fresno, California, U.S.A (SRO). Observation started at 2026-06-11 08:22:08 UT, i.e., ~ 0.36 days post-burst, and a series of R-band frames were obtained. The previously reported optical counterpart (O'Neill et al., GCN 44903; Watson et al., GCN 44905) is clearly detected in our stacked images with a brightness of R = 18.92 +/- 0.05, calibrated with Pan-STARRS DR2 stars in the field and not corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/44909. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43062] EP260610a: refined analysis of the EP-WXT and follow-up EP-FXT observations
by GCN Circulars 11 Jun '26

11 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44908 SUBJECT: EP260610a: refined analysis of the EP-WXT and follow-up EP-FXT observations DATE: 26/06/11 08:52:18 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> H. Y. Ren, C. L. Guo, Z. X. Ling (NAO, CAS), H.Z. Wu (HUST, CAS), on behalf of the Einstein Probe (EP) team: The fast X-ray transient EP260610a was detected by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission at 2026-06-10T04:41:46 (UTC). We note that the trigger time reported in Wu et al., GCN 44889 was incorrect. The correct trigger time is 2026-06-10T04:49:21 (UTC). The WXT light curve lasted for around 450 seconds before the interruption of the autonomous follow-up. The average WXT 0.5–4 keV spectrum can be fitted with an absorbed power-law model with a fixed Galactic hydrogen column density of 0.46 × 10^21 cm^−2 and a photon index of 0.89 (+0.60/−0.57). The derived average unabsorbed 0.5–4 keV flux is 2.71 (+1.21/−0.70) × 10^−10 erg s^−1 cm^−2. The autonomous follow-up observation with the Follow-up X-ray Telescope (FXT) on board EP was performed at 2026-06-10T04:52:19 (UTC). The exposure time was approximately 3.5 ks. The on-ground analysis of the FXT data detected an uncatalogued X-ray source at R.A. = 306.1022 deg, DEC = −25.9045 deg (J2000), with an uncertainty of 10 arcsec in radius (90% C.L., including statistical and systematic uncertainties). The average FXT 0.5–10 keV spectrum can be fitted with an absorbed power-law model with a fixed Galactic hydrogen column density of 0.46 × 10^21 cm^−2 and a photon index of 1.95 (+0.07/−0.07). The derived average unabsorbed 0.5–10 keV flux is 0.82 (+0.06/−0.05) × 10^−11 erg s^−1 cm^−2. The uncertainties quoted above are at the 90% confidence level. We note that follow-up observations were carried out with COLIBRÍ (de Ugarte Postigo et al., GCN 44890) and SVOM/VT (Li et al., GCN 44896), but no optical counterpart was detected in these observations. Launched on January 9, 2024, EP is a space X-ray observatory designed 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/44908. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43061] GRB 260611A: Fermi GBM Final Real-time Localization
by GCN Circulars 11 Jun '26

11 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44907 SUBJECT: GRB 260611A: Fermi GBM Final Real-time Localization DATE: 26/06/11 08:12:44 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 08:00:16 UT on 11 Jun 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260611A (trigger 802857621.474604 / 260611334). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 126.4, Dec = -41.2 (J2000 degrees, equivalent to J2000 08h 25m, -41d 12'), with a statistical uncertainty of 18.7 degrees. The angle from the Fermi LAT boresight is 111.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260611334/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260611334/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260611334/… View this GCN Circular online at https://gcn.nasa.gov/circulars/44907. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43060] EP260610b: COLIBRÍ optical observations
by GCN Circulars 11 Jun '26

11 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44906 SUBJECT: EP260610b: COLIBRÍ optical observations DATE: 26/06/11 06:56:12 GMT FROM: enriquemm(a)astro.unam.mx Enrique Moreno Méndez (UNAM), Dalya Akl (NYUAD), Rosa L. Becerra (UNAM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Edilberto Aguilar-Ruiz (UNAM), Jean-Luc Atteia (IRAP), Camila Angulo (UNAM), Sarah Antier (IJCLAB), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Jean-Grégoire Ducoin (CPPM), Francis Fortin (IRAP), Leonardo García García (UNAM), Ramandeep Gill (UNAM), Noémie Globus (UNAM), Marion Guelfand (CPPM), Asuka Kuwata (UNAM), Massimiliano Lincetto (CPPM), Nikos Mandarakas (LAM), Diego López-Cámara (UNAM), Francesco Magnani (CPPM), Margarita Pereyra (UNAM), Ny Avo Rakotondrainibe (LAM), Fredd Sánchez Álvarez (UNAM), Benjamin Schneider (LAM) and Antonio de Ugarte Postigo (LAM) report: We imaged the field of the EP260610b (Wu et al., GCN Circ. 44895) using the DDRAGO two-channel wide-field imager on the COLIBRÍ telescope. We observed from 2026-06-11 05:16 to 06:32 UTC (from 16.48 to 17.73 hours after the trigger) and obtained 54 minutes of simultaneous exposure in the r/z filters. The data were reduced and coadded with the ASU 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. We marginally detect the optical counterpart reported by Levan et al., GCN Circ. 44897, in the r band, at a preliminary magnitude of: r ≈ 23.7, In z, we do not detect the source down to the following 3-sigma limit: z > 22.0. These values are consistent with those reported by Gemini (Levan et al., GCN Circ. 44897), SVOM/VT (Xin et al., GCN Circ. 44900), NOT (Zhu et al., GCN Circ. 44902) and MAO/AZT-22 (Burkhonov et al., GCN Circ. 44904). 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/44906. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43059] GRB 260610B: DDOTI optical observations
by GCN Circulars 11 Jun '26

11 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44905 SUBJECT: GRB 260610B: DDOTI optical observations DATE: 26/06/11 06:31:15 GMT FROM: Alan Watson at UNAM <alan(a)astro.unam.mx> Alan M. Watson (UNAM), Camila Angulo Valdez (UNAM), Rosa L. Becerra (UNAM), Nat Butler (ASU), Tsvetelina Dimitrova (ASU), William H. Lee (UNAM), and Margarita Pereyra (UNAM) report: We observed the field of GRB 260610B (Fermi Team, GCN Circ. 44901) with the DDOTI wide-field imager at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2026-06-11 04:53 to 05:44 UTC (5.1 to 5.9 hours after the trigger) obtaining total exposure of 27 minutes. We detect the candidate afterglow GOTO26fua/AT2026owq reported by O'Neill et al. (GCN Circ. 44903) with a preliminary AB magnitude of: w = 18.82 +/- 0.04 Compared to the observations reported by O'Neill et al. at 0.21 hours, the candidate continues to fade and has an estimated temporal decay index of approximately −0.6, in agreement with that measured by O'Neill et al. between 0.21 and 1.4 hours. We thank the staff of the Observatorio Astronómico Nacional on the Sierra of San Pedro Mártir. View this GCN Circular online at https://gcn.nasa.gov/circulars/44905. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43058] EP260610b: MAO/AZT-22 optical observations
by GCN Circulars 11 Jun '26

11 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44904 SUBJECT: EP260610b: MAO/AZT-22 optical observations DATE: 26/06/11 04:37:49 GMT FROM: Yodgor Rajabov at UBAI <rajabov(a)astrin.uz> O. Burkhonov, Y. Rajabov, B.Abidkhanov, S. Ehgamberdiev, Y. Tillayev, T. Boyqobilov, A. Shaymanov report on behalf of UBAI team. We observed the field of EP transient EP260610b (Wu et al., GCN 44895), with the AZT-22 1.5m telescope of the Maidanak Observatory (MAO) starting on 2026-06-10 at 20:09:52 UT. In total we obtained 6x300 s exposures in the R-band using 4kx4k CCD SNUCAM camera (Im et al., 2010). The optical counterpart (Levan et al., GCN 44897; Xin et al., GCN 44900; Zhu et al., GCN 44902) is detected in the stacked frame. Preliminary photometry is the following: Date MidTime Exptime t-T0 Filter OT Err. UL SNR Site/Telescope (nxs) (mid, days) 2026-06-10T20:24:52 6x300 0,317072 R 22.85 0.15 23.26 6.4 MAO/AZT-22 All the data have been reduced by a single data processing pipeline, STDPipe (Karpov et al., 2022) web interface called STDweb (Karpov et al., 2025). Images obtained in Johnson Cousins filters were calibrated using the Gaia DR3 Synphot catalog. The data has not corrected for the Galactic extinction. Maidanak astronomical observatory (MAO) is an observational facility of the Ulugh Beg Astronomical Institute (UBAI), Uzbekistan Academy of Sciences (http://maidanak.uz/) View this GCN Circular online at https://gcn.nasa.gov/circulars/44904. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43057] EP260610b: NOT optical observation
by GCN Circulars 11 Jun '26

11 Jun '26

TITLE: GCN CIRCULAR NUMBER: 44902 SUBJECT: EP260610b: NOT optical observation DATE: 26/06/11 02:42:23 GMT FROM: Zipei Zhu at NAOC <zpzhu(a)nao.cas.cn> Z.-P. Zhu, X. Liu, L.-B. He, J. An, S.-Q. Jiang, D. Xu (NAOC), S.-Y. Fu (HUST) reports on behalf of a large collaboration: We observed the field of EP260610b detected by EP (Wu et al., GCN 44895), using the 2.56m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observation started at 2026-06-10 22:20:33 UT, i.e., about 0.4 days post-burst, and a series of r-band frames were obtained. The previously reported optical counterpart (Levan et al., GCN 44897; Xin et al., GCN 44900) is detected in our stacked images with a preliminary brightness of r ~ 22.5, calibrated with Pan-STARRS DR2 stars in the field and not corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/44902. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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