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

[vsnet-grb-info 34679] EP240703a: KAIT optical upper limit
by GCN Circulars 05 Jul '24

05 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36825 SUBJECT: EP240703a: KAIT optical upper limit DATE: 24/07/05 01:45:56 GMT FROM: Weikang Zheng at UC Berkeley <weikang(a)berkeley.edu> WeiKang Zheng (UCB), Xuhui Han (NAOC), Pinpin Zhang (NAOC) and Alexei V. Filippenko (UCB) report on behalf of the KAIT GRB team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to the fast X-ray transient EP240703a from the Einstein Probe (Wang et al. GCNC 36807) starting at 1.28 days after the trigger. A set of 30x60s images were obtained in the clear (roughly R) filters. Preliminary analysis do not reveal any optical counterpart candidate within the 3 arcmin radius EP-WXT error box (Wang et al. GCN 36807) neither in single image, nor in the co-add images, consistent with the reports from Aryan et al. (GCN 36819), An et al. (GCN 36820), Bochenek & Perley (GCN 36821), Fernandez-Garcia et al. (GCN 36822) and Volnova et al. (GCN 36824). The typical limiting magnitude of our single clear image is about 19.0 mag. View this GCN Circular online at https://gcn.nasa.gov/circulars/36825. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34678] EP240703a: BTA observations
by GCN Circulars 04 Jul '24

04 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36824 SUBJECT: EP240703a: BTA observations DATE: 24/07/04 22:54:06 GMT FROM: Alexei Pozanenko at IKI, Moscow <grb.alex(a)gmail.com> A. Volnova (IKI), A. Moskvitin (SAO RAS), A. Pozanenko (IKI), D. Oparin (SAO RAS), N. Pankov (IKI, HSE), S. Belkin (IKI, HSE) on behalf of GRB IKI FuN report: We observed the TRT candidate afterglow position (An et al., GCN 36815) of the X-ray transient EP240703a (Wang et al., GCN 36807) and probable gamma-ray burst GRB 240703A (Frederiks et al., GCN 36809) with BTA SAO RAS telescope equipped with SCORPIO-1 camera in Ic filter starting on 2024-07-03 (UT) 20:50:07, i.e. 0.856 days after burst. We did not detect the TRT candidate afterglow (An et al., GCN 36815) which might be a spurious event (An et al., GCN 36820). At the stacked images of 9x180 s we obtained an upper limit of Ic= 24.6m (3 sigma). We cannot confirm that the TRT afterglow candidate (An et al., GCN 36815) is real. Our result is consistent with reported results (Aryan et al., GCN 36819, Bochenek and Perley GCN 36821; Fernandez-Garcia et al., GCN 36822). We are grateful to the Directorate of the Special Astrophysical Observatory for allocation of the TOO observation. View this GCN Circular online at https://gcn.nasa.gov/circulars/36824. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34677] EP240703c: Kinder optical follow-up and Swift XRT observations
by GCN Circulars 04 Jul '24

04 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36823 SUBJECT: EP240703c: Kinder optical follow-up and Swift XRT observations DATE: 24/07/04 21:01:36 GMT FROM: Janet Chen at National Central University <janetstars(a)gmail.com> Y. J. Yang, A. Aryan (both NCU), S. Yang (HNAS), T.-W. Chen (NCU), H. F. Stevance (Oxford), S. J. Smartt (Oxford/QUB), W.-J. Hou, C.-S. Lin, M.-H. Lee, Y.-C. Pan, H.-Y. Hsiao, C.-C. Ngeow, C.-H. Lai, A. Sankar.K, H.-C. Lin, J.-K. Guo (all NCUIA), S. Srivastav, J. Gillanders, L. Rhodes (all Oxford), M. Fulton, T. Moore, K. W. Smith, C. Angus, A. Aamer (all QUB), A. Schultz and M. Huber (both IfA, University of Hawaii) report: We observed the field of the fast X-ray transient EP240703c (Zhang et al., GCN 36818) using the 40cm SLT at Lulin Observatory in Taiwan as part of the Kinder collaboration (Chen & Yang et al., 2024arXiv240609270C). The first SLT epoch of observations started at 14:51 UT on 4th of July 2024 (MJD = 60495.619), 20.6 hrs after the EP trigger and we observed for a total of 4500 seconds on source. We used the Kinder pipeline (Yang et al. A&A 646, A22) to stack the images and subtract the stacked images with the SkyMapper template images. We do not detect any optical counterpart in the errorbox of 3 arcminute around the position of the EP source specified by Zhang et al., (GCN 36818). The details of the observations and the corresponding 2.5 sigma upper limit (in the AB system) in our combined image are as follows: Telescope | Filter | MJD (start) | t-t0 | Exposure | Magnitude | avg. Seeing | med. Airmass SLT | r | 60495.619 | 20.6 hrs | 300 sec * 15 | > 21.41 | 2".3 | 1.74 The presented magnitudes are calibrated using the field stars from the SkyMapper catalog and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.09 mag in the direction of the burst (Schlafly & Finkbeiner 2011). The EP team triggered the Swift ToO observations (PI: EP) for EP240703c (Zhang et al., GCN 36818). They noticed that there is a previous Swift X-ray observation of a high proper motion star LP 924-17 (Evans+, 2020). The new Swift observation was carried out from 2024-07-04T11:41:37 to 2024-07-04T12:00:53. We obtained some initial results from the quick-look data using the Swift-XRT products provided by the UK Swift Science Data Centre. Applying a simple power-law model with absorption, we derived a column density NH ≈ 5.0 × 10^21 cm^-2, a photon index of approximately 4.2, which indicates a relatively soft spectrum, and an unabsorbed flux in the 0.3-10 keV band of ~ 2 × 10^-11 erg cm^-2 s^-1. For the UVOT data, the source is visible in the images across all bands. It is clearly detected in the V band with a magnitude of 17.76 ± 0.20 (stat) ± 0.01 (sys) in the AB system. However, the source cannot be well constrained in the B, U, UVM2, UVW1, and UVW2 bands. Further, we report the PSF photometry measurement on this high proper motion star LP 924-17, which has no significant brightness change during our SLT observations, with an average magnitude of r = 16.88 +/- 0.05 mag. View this GCN Circular online at https://gcn.nasa.gov/circulars/36823. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34676] EP240703a: BOOTES-3 optical upper limit
by GCN Circulars 04 Jul '24

04 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36822 SUBJECT: EP240703a: BOOTES-3 optical upper limit DATE: 24/07/04 19:24:51 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct(a)iaa.es> E. Fernandez-Garcia, I. Perez-Garcia, S.-Y. Wu, A. J. Castro-Tirado, M. D. Caballero-Garcia, I, Olivares, R. Sanchez-Ramirez and S. Guziy (IAA-CSIC), Y.-D. Hu (INAF-OAB), A. Castellon, S. Castillo, A. Reina and C. Perez del Pulgar (Univ. de Malaga), Ph. Yock (Univ. of Auckland), and R. Querel (NIWA), on behalf of a larger collaboration, report: Following the detection of EP240703a by EP-WXT (Wang et al., GCNC 36807) and Konus-Wind (Frederiks et al., GCNC 36809), we triggered the 60cm BOOTES-3/YA robotic telescope at NIWA Lauder in Otago (New Zealand) to observe the fast X-ray transient location on Jul. 3 at 14:28 UT (13.9 hrs after the detection). No new optical source is detected on the co-added images (60 x 30 s, clear-filter) within the 3 arcmin radius EP error box (Wang et al. GCNC 36807) down to 20.5 mag, which is consistent with the reports from Kinder (Aryan et al. GCNC 36819), TRT (An et al. GCNC 36820) and LT (Bochenek and Perley GCNC 36821) later on. We thank the staff at NIWA at Lauder for its excellent support and especially to Bill Allen (1940-2023) for his invaluable contribution in the early times at the Blenheim site where our former BOOTES-3 station was initially deployed on his vineyard (until it was moved to Lauder in 2014). Bill Allen, a vintner (besides an engineer & astronomer!) remains in our hearts and we remember him every night we are looking to the heavens thru our Yock-Allen (YA) robotic telescope at the new BOOTES-3 station. View this GCN Circular online at https://gcn.nasa.gov/circulars/36822. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34675] EP240703a: Liverpool Telescope optical follow-up observations
by GCN Circulars 04 Jul '24

04 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36821 SUBJECT: EP240703a: Liverpool Telescope optical follow-up observations DATE: 24/07/04 17:53:09 GMT FROM: A. Bochenek at Liverpool John Moores University <a.m.bochenek(a)2023.ljmu.ac.uk> A. Bochenek and D. A. Perley (LJMU) report: We observed the field of the X-ray transient and probable gamma-ray burst EP240703a (Wang et al., GCN 36807; Frederiks et al., GCN 36809) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 5x180s exposures with the SDSS-I filter between 2024-07-04 02:27:40 UT and 2024-07-04 02:45:02 UT, approximately 1.1 days after the transient. The limiting magnitude of the stacked image is i > 21.9 mag (AB) for a three-sigma detection limit, with mid-observation time being 2024-07-04 02:34:51 UT. No new sources were identified within the 90% confidence 3 arcmin error circle compared to the Pan-STARRS catalogue. Additionally, no source was detected at the TRT candidate afterglow position (An et al., GCN 36815), now thought to be a probable cosmic ray (An et al., GCN 36820). View this GCN Circular online at https://gcn.nasa.gov/circulars/36821. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34674] EP240703a/GRB 240703A: TRT optical candidate likely not real
by GCN Circulars 04 Jul '24

04 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36820 SUBJECT: EP240703a/GRB 240703A: TRT optical candidate likely not real DATE: 24/07/04 10:42:33 GMT FROM: Dong Xu at NAOC/CAS <dxu(a)nao.cas.cn> J. An (NAOC), S. Tinyanont, R. Anutarawiramkul, P. Butpan (NARIT), S.Q. Jiang, X. Liu, S.Y. Fu, Z.P. Zhu, D. Xu, Z. Fan, W.X. Li, N.C. Sun, Y.N. Wang (NAOC) report on behalf of a large collaboration: Regarding our previously reported afterglow candidate of EP240703a/GRB 240703A (An et al., GCN 36815), we have checked the five 360 s R-band TRT images one by one. First, the candidate is only present in one of the five images, and not in the other four images. Second, it looks sharper than its neighboring sources, although it does cover multiple pixels in the image. We thus re-did cosmic ray removal with a revised script, and this time the candidate basically disappeared while its neighboring sources were almost unaffected by the same cosmic ray removal process. We thus conclude that the candidate is very likely not real. View this GCN Circular online at https://gcn.nasa.gov/circulars/36820. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34673] EP240703a: Kinder optical follow-up observations
by GCN Circulars 04 Jul '24

04 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36819 SUBJECT: EP240703a: Kinder optical follow-up observations DATE: 24/07/04 10:31:37 GMT FROM: Amar Aryan at National Central University, Institute of Astronomy (NCUIA) <amararyan941(a)gmail.com> A. Aryan (NCUIA), S. Yang (HNAS), T.-W. Chen, Y.-J. Yang, C.-S. Lin, M.-H. Lee, Y.-C. Pan, H.-Y. Hsiao, W.-J. Hou, C.-C. Ngeow, C.-H. Lai, A. Sankar.K, H.-C. Lin, J.-K. Guo (all NCUIA), S. J. Smartt (Oxford/QUB), H. F. Stevance, S. Srivastav, J. Gillanders, L. Rhodes (all Oxford), M. Fulton, T. Moore, K. W. Smith, C. Angus, A. Aamer (all QUB), A. Schultz and M. Huber (IfA, University of Hawaii) report: We observed the field of the fast X-ray transient EP240703a (Wang et al., GCN 36807) using the One-meter Telescope (LOT) at Lulin Observatory in Taiwan as part of the Kinder collaboration (Chen & Yang et al., 2024arXiv240609270C). The first LOT epoch of observations started at 12:48 UT on 03rd of July 2024 (MJD = 60494.540), 12.32 hrs after the EP trigger. We utilized the astroalign (Beroiz et al., 2020, A&C, 32, 100384) and astropy (Astropy Collaboration et al., 2022, ApJ, 935, 167) packages to align and stack the individual frames. We subtracted the stacked images with the Pan-STARRS1 template image using hotpants (Becker A., 2015, ascl.soft. ascl:1504.004). We do not detect the presence of the proposed optical transient source at R.A. = 18:15:03.89 and Dec. = -09:42:02.96, as reported by An et al., GCN 36815, in the difference and stacked images. Our observations were 1.58 hours before those of the TRT observations and reach 2 magnitudes deeper. However, we detect a slight enhancement in the brightness of the eclipsing binary, ZTF J181510.36-094110.1 (Chen et al. 2020, ApJS, 249, 18) in the difference image at R.A. = 18:15:10.36 and Dec. = -09:41:10.1, which is close to the reported coordinate of EP240703a being only 0.66 arcmin away. Morever, we utilized the python based package, AutoPhOT (Brennan & Fraser, 2022, A&A, 667, A62) to perform the PSF photometry on our stacked frame. The current magnitudes of the eclipsing binary in our stacked frame are r = 19.02 +/- 0.04 mag and i = 18.18 +/- 0.05 mag. Besides ZTF J181510.36-094110.1, we do not detect any new optical source in the reference and stacked frames. The details of the observations and measured 3-sigma upper limit are as follow: Telescope | Filter | MJD (start) | t-t0 | Exposure | Magnitude | avg. Seeing | med. Airmass LOT | r | 60494.540 | 12.32 hrs | 300 sec * 6 | > 22.3 | 1".48 | 1.47 LOT | i | 60494.598 | 13.72 hrs | 300 sec * 6 | > 21.8 | 1".34| 1.22 The presented magnitudes are calibrated using the field stars from the Pan-STARRS1 catalog and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 1.225 mag in the direction of the burst (Schlafly & Finkbeiner 2011). View this GCN Circular online at https://gcn.nasa.gov/circulars/36819. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34672] EP240703a: Kinder optical follow-up observations
by GCN Circulars 04 Jul '24

04 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36819 SUBJECT: EP240703a: Kinder optical follow-up observations DATE: 24/07/04 10:31:37 GMT FROM: Amar Aryan at National Central University, Institute of Astronomy (NCUIA) <amararyan941(a)gmail.com> A. Aryan (NCUIA), S. Yang (HNAS), T.-W. Chen, Y.-J. Yang, C.-S. Lin, M.-H. Lee, Y.-C. Pan, H.-Y. Hsiao, W.-J. Hou, C.-C. Ngeow, C.-H. Lai, A. Sankar.K, H.-C. Lin, J.-K. Guo (all NCUIA), S. J. Smartt (Oxford/QUB), H. F. Stevance, S. Srivastav, J. Gillanders, L. Rhodes (all Oxford), M. Fulton, T. Moore, K. W. Smith, C. Angus, A. Aamer (all QUB), A. Schultz and M. Huber (IfA, University of Hawaii) report: We observed the field of the fast X-ray transient EP240703a (Wang et al., GCN 36807) using the One-meter Telescope (LOT) at Lulin Observatory in Taiwan as part of the Kinder collaboration (Chen & Yang et al., 2024arXiv240609270C). The first LOT epoch of observations started at 12:48 UT on 03rd of July 2024 (MJD = 60494.540), 12.32 hrs after the EP trigger. We utilized the astroalign (Beroiz et al., 2020, A&C, 32, 100384) and astropy (Astropy Collaboration et al., 2022, ApJ, 935, 167) packages to align and stack the individual frames. We subtracted the stacked images with the Pan-STARRS1 template image using hotpants (Becker A., 2015, ascl.soft. ascl:1504.004). We do not detect the presence of the proposed optical transient source at R.A. = 18:15:03.89 and Dec. = -09:42:02.96, as reported by An et al., GCN 36815, in the difference and stacked images. Our observations were 1.58 hours before those of the TRT observations and reach 2 magnitudes deeper. However, we detect a slight enhancement in the brightness of the eclipsing binary, ZTF J181510.36-094110.1 (Chen et al. 2020, ApJS, 249, 18) in the difference image at R.A. = 18:15:10.36 and Dec. = -09:41:10.1, which is close to the reported coordinate of EP240703a being only 0.66 arcmin away. Morever, we utilized the python based package, AutoPhOT (Brennan & Fraser, 2022, A&A, 667, A62) to perform the PSF photometry on our stacked frame. The current magnitudes of the eclipsing binary in our stacked frame are r = 19.02 +/- 0.04 mag and i = 18.18 +/- 0.05 mag. Besides ZTF J181510.36-094110.1, we do not detect any new optical source in the reference and stacked frames. The details of the observations and measured 3-sigma upper limit are as follow: Telescope | Filter | MJD (start) | t-t0 | Exposure | Magnitude | avg. Seeing | med. Airmass LOT | r | 60494.540 | 12.32 hrs | 300 sec * 6 | > 22.3 | 1".48 | 1.47 LOT | i | 60494.598 | 13.72 hrs | 300 sec * 6 | > 21.8 | 1".34| 1.22 The presented magnitudes are calibrated using the field stars from the Pan-STARRS1 catalog and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 1.225 mag in the direction of the burst (Schlafly & Finkbeiner 2011). View this GCN Circular online at https://gcn.nasa.gov/circulars/36819. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34671] EP240703c: EP-WXT detection of an X-ray transient
by GCN Circulars 04 Jul '24

04 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36818 SUBJECT: EP240703c: EP-WXT detection of an X-ray transient DATE: 24/07/04 07:01:58 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Y. J. Zhang (THU), M. J. Liu, S. Q. Jiang, H. W. Pan, C. C. Jin, Z. X. Ling, W. Yuan, Y. Liu, C. Zhang, W. Chen, H. Q. Cheng, C. Z. Cui, D. W. Fan, H. B. Hu, J. W. Hu, M. H. Huang, D. Y. Li, H. Y. Liu, Z. Z. Lv, T. Y. Lian, X. Mao, X. Pan, H. Sun, W. X. Wang, Y. L. Wang, S. X. Wen, Q. Y. Wu, X. P. Xu, Y. F. Xu, H. N. Yang, M. Zhang, W. D. Zhang, W. J. Zhang, Z. Zhang, D. H. Zhao (NAOC, CAS), Y. Chen, S. M. Jia, S. N. Zhang (IHEP, CAS), E. Kuulkers, A. Santovincenzo (ESA), P. O'Brien (Univ. of Leicester), K. Nandra, A. Rau (MPE), B. Cordier (CEA) on behalf of the Einstein Probe team We report on the detection of an X-ray transient EP240703c at 2024-07-03T18:15:00 (UTC) by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission during a calibration observation. The position of the source is R.A. = 289.264 deg, DEC = -30.325 deg (J2000) with an uncertainty of 3 arcmin (radius, 90% C.L. statistical and systematic). The source lasted for over 1 ks with multipeak structure in its lightcurve. The average 0.5-4 keV spectrum can be fitted with an absorbed power law (with the column density fixed at the Galactic value of 8 x 10^20 cm^-2) with a photon index of 1.3(-0.5/+0.5). The unabsorbed flux is 2.5(-0.8/+0.8) x 10^-10 erg/s/cm^2 in the 0.5-4 keV band. The 90 per cent uncertainties are given for the above parameters. Within the error circle of the WXT position, there is a previous X-ray observation of a high proper motion star LP 924-17 with a flux of 4.6 x 10^-13 erg/cm2/s in the 0.3-10 keV range. Based on the light curve and spectrum of the X-ray transient, we tend to consider that the source is not a stellar flare, although the possibility cannot be ruled out. We have proposed a Swift target of opportunity observation. Further follow-up observations are encouraged to identify the nature of this X-ray transient. The above observation was made with the WXT instrument during the commissioning phase of EP. Launched on January 9, 2024, EP is a space X-ray observatory 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). EP is a mission of the Chinese Academy of Sciences in collaboration with ESA, MPE and CNES. View this GCN Circular online at https://gcn.nasa.gov/circulars/36818. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34670] LIGO/Virgo/KAGRA S240703ad: Updated Sky localization
by GCN Circulars 04 Jul '24

04 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36817 SUBJECT: LIGO/Virgo/KAGRA S240703ad: Updated Sky localization DATE: 24/07/04 02:26:41 GMT FROM: Aditya Vijaykumar <aditya.vijaykumar(a)ligo.org> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further analysis of the LIGO Livingston Observatory (L1) and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S240703ad (GCN Circular 36816). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/superevents/S240703ad For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 3785 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1894 +/- 679 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/. [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. (2023) arXiv:2307.13380 View this GCN Circular online at https://gcn.nasa.gov/circulars/36817. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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