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[vsnet-grb-info 42246] GRB 260310A / AT 2026fgk: COLIBRÍ photometric evidence of the emerging supernova
by GCN Circulars 27 Mar '26

27 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44125 SUBJECT: GRB 260310A / AT 2026fgk: COLIBRÍ photometric evidence of the emerging supernova DATE: 26/03/27 08:14:57 GMT FROM: enriquemm(a)astro.unam.mx Marion Guelfand (CPPM), Enrique Moreno Méndez (UNAM), Rosa L. Becerra (UNAM), Antonio de Ugarte Postigo (LAM), Noémie Globus (UNAM), Alan M. Watson (UNAM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Edilberto Aguilar-Ruiz (UNAM), Jean-Luc Atteia (IRAP), Camila Angulo (UNAM), Dalya Akl (NYUAD), Sarah Antier (IJCLAB), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Jean-Grégoire Ducoin (CPPM), Francis Fortin (IRAP), Leonardo García García (UNAM), Ramandeep Gill (UNAM), 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), and Benjamin Schneider (LAM) and report: We imaged the field of the optical counterpart AT 2026fgk (O’Neill et al. 2026, TNS Discovery Report 294132; Hinds et al., AstroNote 2026-65) of GRB 260310A (Hamburg & Meegan, GCN 43975; Salunke et al., GCN 43958) using the DDRAGO two-channel wide-field imager on the COLIBRÍ telescope. We observed from 2026-03-27 02:46 to 03:59 UTC (from 16.90 to 16.95 days after the trigger) and obtained 1080 seconds in g, r, and i filters, and 3240 seconds of exposure in the z filter. The data were reduced, coadded and analysed with the COLIBRÍ ASU pipeline. The photometry was calibrated using nearby stars from the PanSTARRS DR1 catalog, it is in the AB system, and it is not corrected for Galactic extinction. We have obtained spectral energy distributions at multiple epochs prior to T+12 days, all of which are well described by a single power law with a spectral index β ≈ −1. However, tonight we observe a significant increase in the g−r and g-i colours and a decrease in the i−z colour indicating the emergence of a thermal component in the spectral energy distribution. This behaviour suggests the onset of a supernova, in agreement with the report by de Ugarte Postigo et al. (GCN Circ. 44124) Further observations and analysis are ongoing. 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/44125. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42245] GRB 260310A: OSIRIS+/GTC spectroscopic detection of the associated BL-Ic, SN 2026fgk
by GCN Circulars 27 Mar '26

27 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44124 SUBJECT: GRB 260310A: OSIRIS+/GTC spectroscopic detection of the associated BL-Ic, SN 2026fgk DATE: 26/03/27 07:39:02 GMT FROM: Antonio de Ugarte Postigo at LAM, CNRS <adeugartepostigo(a)gmail.com> A. de Ugarte Postigo (LAM), S. Geier (GTC), L. Izzo (INAF/OACN and DARK/NBI), D. B. Malesani (DAWN/NBI and Radboud), A. Martin-Carrillo (UCD), C. C. Thoene (AbAO), M. A. Aloy (UV), J. P. U. Fynbo (DAWN/NBI), L. Galbany (IEEC-CSIC), G. Lombardi (GTC), N. A. Rakotondrainibe (LAM), B. Schneider (LAM), N. R. Tanvir (Univ. Leicester), D. González González (GTC) report: We observed the optical counterpart (AT2026fgk, a.k.a. GOTO26buh, O’Neill et al. 2026, TNS Discovery Report 294132; Hinds et al., AstroNote 2026-65) of GRB 260310A (Hamburg & Meegan, GCN 43975; Salunke et al., GCN 43958) using the Gran Telescopio Canarias (GTC) equipped with the OSIRIS+ instrument. A total of 3 spectra of 900 s were secured, starting on 2026-03-27 at 04:25:40 UT (16.98 days after trigger), using grism R1000B. Continuum is visible over the full range 3610-7880 AA. The spectrum has evolved from the power-law continuum reported in de Ugarte Postigo et al. (GCN 43984) and now shows undulations expected in a SN spectrum. Indeed, using SNID to classify the SN we get a best match to a type Ic-BL SN close to maximum light. Our results allow us to conclusively identify the presence of a SN, linking the event to a massive stellar collapse. View this GCN Circular online at https://gcn.nasa.gov/circulars/44124. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42244] The EP-WXT trigger 01709259173 is likely a flaring star
by GCN Circulars 27 Mar '26

27 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44123 SUBJECT: The EP-WXT trigger 01709259173 is likely a flaring star DATE: 26/03/27 04:19:32 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Z. H. Yang(IHEP), C. Y. Dai (NJU), Q. C. Zhao(IHEP), W. F. Wen(SZTU) on behalf of the Einstein Probe (EP) team: The EP-WXT trigger 01709259173 at the time of 2026-03-26T22:01:59, is likely a stellar flare associated with UCAC4 220-087219. The estimated flux of the flare is around 1.92e-11 erg/s/cm^2 in 0.5-4.0 keV, corresponding to an X-ray luminosity of around 4e+31 erg/s. 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). View this GCN Circular online at https://gcn.nasa.gov/circulars/44123. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42243] GRB 260310A / AT2026fgk: Late-time infrared detection with MIRAGE on the MDM 1.3m telescope
by GCN Circulars 27 Mar '26

27 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44122 SUBJECT: GRB 260310A / AT2026fgk: Late-time infrared detection with MIRAGE on the MDM 1.3m telescope DATE: 26/03/27 00:39:12 GMT FROM: Kishalay De at Columbia University <kde1(a)mit.edu> R. B. Effress, B. T. Gebreamlak, B. O. Goldman, T. Goodman, J. Kalish, L. Koo, T. Lack, S. A. Lawsky, S. L. Manyan, M. Nebart, K. N. Oqueli-White, A. Ramadorai, N. A. Rodgers, T. A. Sabin, E. Sharman, C. Wu, L. Zheng, R. Zheng, G. Mo, V. Karambelkar, S. Ibrahim, N. Aftab, D. Schiminovich, K. De (Columbia University) We observed the field of GRB 260310A detected by Fermi/GBM (Fermi GB team GCN 43951) and AstroSat CZTI (Salunke et al. GCN 43958), during commissioning operations of the MDM InfraRed Astronomy InGaAs Explorer (MIRAGE) instrument on the MDM 1.3m telescope. Observations were carried out starting at UTC 2026-03-22 08:50, approximately three weeks after the GRB trigger. We obtained a series of dithered exposures in J-band and Hs-band amounting to a total exposure time of 600 s each. Images were aligned, stacked and calibrated to the 2MASS catalog. Performing forced photometry at the position of the optical counterpart (AT2026fgk; Konno et al. GCN 43974, Hinds et al. AstroNote 2026-65; O’Neill et al. TNS Discovery Report 294132), we clearly detect a point source with magnitudes J = 18.40 +/- 0.14 Vega mag Hs = 17.07 +/- 0.16 Vega mag The measurements confirm continued infrared fading of the source (Gao et al. GCN 44110). Note that these measurements did not include image subtraction, though the host contamination is expected to be small. Further observations are planned and analysis is being improved. MIRAGE is a new YJH-band near-infrared imager for the MDM 1.3m telescope. We thank the MDM Observatory staff for supporting the commissioning observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/44122. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42242] IPN triangulation of GRB 260320A
by GCN Circulars 26 Mar '26

26 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44121 SUBJECT: IPN triangulation of GRB 260320A DATE: 26/03/26 23:15:43 GMT FROM: Dmitry Svinkin at Ioffe Institute <svinkin(a)mail.ioffe.ru> A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars Odyssey team, D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, E. Burns on behalf of the IPN, C. Wang (IHEP), S. Xiong (IHEP), S. Zhang (IHEP), J. Wei (NAOC), B. Cordier (CEA) on behalf of the SVOM-GRM team, C. Wang (IHEP), S. Xiong (IHEP), S. Zhang (IHEP) on behalf of the Insight-HXMT team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report: The long-duration GRB 260320A (NuSTAR-ACS detection: Waratkar et al., GCN 44064; Insight-HXMT/HE detection: Luo et al., GCN 44077; Glowbug detection: Cheung et al., GCN 44093; GRID detection: Li et al., GCN 44109) was detected by NuSTAR (ACS), SVOM (GRM), Insight-HXMT(HE), Konus-Wind, Glowbug, GRID-11B, GRID-10B, and Mars-Odyssey (HEND) at about 70804 s UT (19:40:04). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 316.117 (21h 04m 28s) +6.388 ( +6d 23' 17") Corners: 318.993 (21h 15m 58s) +11.535 (+11d 32' 06") 313.686 (20h 54m 45s) -0.693 (+00d 41' 36") 313.683 (20h 54m 44s) -1.165 (-01d 09' 54") 318.941 (21h 15m 46s) +11.286 (+11d 17' 09") --------------------------------------------- The error box area is 1.3 sq. deg, and its maximum dimension is 13.8 deg (the minimum one is 5.7 arcmin). The Sun distance was 42 deg. This localization may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB260320_T70801/IPN/ The HEALPix triangulation map is the multi-order HEALPix in units of probability density. The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. View this GCN Circular online at https://gcn.nasa.gov/circulars/44121. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42241] EP260324a: ZTF discovery of the optical counterpart ZTF26aapviim/AT2026hir
by GCN Circulars 26 Mar '26

26 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44120 SUBJECT: EP260324a: ZTF discovery of the optical counterpart ZTF26aapviim/AT2026hir DATE: 26/03/26 21:32:04 GMT FROM: akashjanaki98(a)gmail.com Akash Anumarlapudi (UNC CH), Robert Stein (UMd), Tomas Ahumada (NOIRLab), Jillian Rastinejad (UMd), Mansi Kasliwal, Lin Yan (Caltech), D. Y. Li, C.C.Jin, W. Yuan (NAO, CAS) report, on behalf of the ZTF collaboration. Einstein Probe detected a long-lived X-ray transient (EP260324a; Wu et al., ATel #17728) beginning on 2026-03-24T07:04:20 (hereafter 't0') that triggered the Wide-field X-ray Telescope (WXT) multiple times over the following day. Subsequent observations with the Follow-up X-ray Telescope (FXT) proposed a likely association of this transient with the galaxy SDSS J084412.34+820110.9. Here, we report the Zwicky Transient Facility (ZTF; Bellm et al. 2019, Graham et al. 2019) discovery of the optical counterpart, ZTF26aapviim / AT2026hir. AT2026hir was detected by the ZTF survey on 2026-03-26T04:51:22, but forced photometry revealed an earlier detection at 2026-03-24T04:17:28. This first detection is ~3 hours before the first EP detection. The source thus exhibited a moderately fast rise (0.7 mag per day). ZTF light curve of AT2026hir is provided below: | Time (days since t0) | Band | Magnitude | Error | Limiting magnitude | | -------- | -------- | -------- | -------- | ------- | -0.12 | r | 20.14 | 0.15 | 20.52 | 0.07 | g | -- | -- | 17.93 | 1.91 | r | 18.71 | 0.11 | 19.42 | 2.07 | g | 18.38 | 0.08 | 19.49 | We note that AT2026hir was also reported to TNS by ATLAS (Tonry et al. 2018), with detections beginning at 2026-03-26T07:32:13.920 (~2 days after the EP discovery). The transient is 0.3" away from the nucleus (PS1 position) of the host galaxy identified by ATel #17728 (Wu et al.), so it may be nuclear. The host galaxy itself does not display any obvious evidence of being an AGN (W1-W2=0.2, no detection in milliquas (Flesch et al. 2023), and no previous significant ZTF detections). We are pursuing and encouraging follow-up observations to classify the source and validate the X-ray and optical association. Based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Award #2407588 and a partnership including Caltech, USA; Caltech/IPAC, USA; University of Maryland, USA; University of California, Berkeley, USA; University of Wisconsin at Milwaukee, USA; Cornell University, USA; Drexel University, USA; University of North Carolina at Chapel Hill, USA; Institute of Science and Technology, Austria; National Central University, Taiwan; Operations are conducted by Caltech's Optical Observatory (COO) and Caltech/IPAC. View this GCN Circular online at https://gcn.nasa.gov/circulars/44120. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42240] GRB 260310A / AT2026fgk: R- and I-band observations with the PKU 60 cm optical telescope
by GCN Circulars 26 Mar '26

26 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44119 SUBJECT: GRB 260310A / AT2026fgk: R- and I-band observations with the PKU 60 cm optical telescope DATE: 26/03/26 13:15:35 GMT FROM: Y.C. Kang at Peking University <yckang(a)stu.pku.edu.cn> Yacheng Kang, Qiang Wang, Ruize Shi, Zexuan Wu, Zhuokai Liu, Yiming Dong, Ziming Wang, Chenxi Bao, Fangzhou Ren, Lijing Shao, Zhuo Li, Subo Dong (PKU) report on behalf of the PKU HiTF (High-energy Transients Follow-up) group: The field of GRB 260310A (Fermi GBM Team, GCN 43951; Salunke et al., GCN 43958) was observed with the PKU 60 cm optical telescope at Xinglong Observatory, NAOC. Observations began on 2026 Mar 18, corresponding to ~8.6 days after the GRB trigger, and were conducted over a total of three epochs. In the stacked R- and I-band images, we clearly detect the optical counterpart AT2026fgk (e.g., Konno et al., GCN 43974; Hinds et al., GCN 43977; Lipunov et al., GCN 43978; Martin-Carrillo et al., GCN 43979; Moreno Méndez et al., GCN 43980; de Ugarte Postigo et al., GCN 43984; Hsu et al., GCN 43986; Malesani et al., GCN 43990; Becerra et al., GCN 43991; Li et al., GCN 43993; Stein et al., GCN 43996; Martin-Carrillo et al., GCN 44000; Watson et al., GCN 44001; Lai et al., GCN 44002; Izzo et al., GCN 44003; Brivio et al., GCN 44004; Moskvitin et al., GCN 44006; Romanov, GCN 44020; Brosio et al., GCN 44021; Pawar et al., GCN 44022; Belkin et al., GCN 44043; Li et al., GCN 44044; Gupta et al., GCN 44051; Passaleva et al., GCN 44058; Becerra et al., GCN 44059; Volnova et al., GCN 44060; Busmann et al., GCN 44061; Zheng et al., GCN 44065; Brosio et al., GCN 44067; Pankov et al. GCN 44073; Perley et al. GCN 44096; Passaleva et al. GCN 44104; Serrau et al. GCN 44112; O'Neill et al. 2026, TNS Discovery Report 294132). Preliminary photometry yields R-band magnitudes ranging from ~18.7 to ~18.9 mag and I ~ 18.5 mag, calibrated against nearby Pan-STARRS field stars and reported in the Vega system, without correction for Galactic extinction. The observation log is summarized below (T0 = 2026-03-10T04:57:10.81; GRB 260310A): | Date | Start_UT | T_mid − T0 (days) | Filter | Exposure (s) | Magnitude (Vega) | | :--------: | :---------: | :---------------: | :----: | :----------: | :--------------: | | 2026-03-18 | 20:23:26.87 | 8.66 | R | 4 * 600 | 18.66 +/- 0.03 | | 2026-03-19 | 16:22:31.97 | 9.53 | I | 15 * 600 | 18.45 +/- 0.03 | | 2026-03-19 | 18:57:02.55 | 9.63 | R | 14 * 600 | 18.90 +/- 0.03 | Further analysis and follow-up observations are ongoing. The 60 cm telescope is operated by the Department of Astronomy, School of Physics, Peking University. The PKU HiTF group is dedicated to rapid follow-up observations of high-energy transients. View this GCN Circular online at https://gcn.nasa.gov/circulars/44119. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42239] GRB 260326A: Fermi GBM Detection
by GCN Circulars 26 Mar '26

26 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44118 SUBJECT: GRB 260326A: Fermi GBM Detection DATE: 26/03/26 11:21:12 GMT FROM: Utkarsh Pathak at IIT Bombay <utkarshpathak.07(a)gmail.com> U. Pathak (IITB) and S. Bala (USRA) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 01:18:28.51 UT on 26 March 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260326A (trigger 796180713/260326054). The Fermi GBM real-time Localization is reported in GCN 44115. The angle from the Fermi LAT boresight is 76 degrees. The GBM light curve consists of two spikes from a single emission episode with a duration (T90) of about 50 s (50-300 keV). The time-averaged spectrum from T0-6.0 to T0+66.0 s is best fit by a Band function with Epeak = 275 +/- 1 keV, alpha = -1.040 +/- 0.004, and beta = -2.00 +/- 0.01. The event fluence (10-1000 keV) in this time interval is (5.37 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+7.0 s in the 10-1000 keV band is 32.6 +/- 0.4 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/44118. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42238] EP260321a: JinShan near-infrared observations
by GCN Circulars 26 Mar '26

26 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44117 SUBJECT: EP260321a: JinShan near-infrared observations DATE: 26/03/26 07:29:39 GMT FROM: liuxing(a)nao.cas.cn Lin. B. He, X. Liu (NAOC), S.Y. Fu, A.D. Zhu, L. Lei, H.Z. Wu, W.H. Lei, Y.C. Zou (HUST), J. An, S.Q. Jiang, Z.P. Zhu, D. Xu (NAOC), J.Z. Liu (XAO), Zhong-Nan Dong, Bin Ma (Sun Yat-sen University) We observed the field of EP260321a (Huang et. al, GCN 44068) using the JinShan 100C telescope, equipped with the INS Mars640 SWIR Camera, located at Altay, Xinjiang, China. Observation started at 2026-03-25 15:12:02 UT, i.e., 4.11 days post-burst, and a series of J-band frames were obtained. The optical counterpart (Lee et al., GCN 44070; Tanvir et al., GCN 44082; Moran et al., GCN 44083; Ahumada et al., GCN 44084; Liu et al., GCN 44087; de Ugarte Postigo et al., GCN 44091; Xu et al., GCN 44092; Pankov et al. GCN 44103; Corcoran et al., GCN 44105; Rastinejad et al., GCN 44107; Gao et al., GCN 44110) was detected in our stacked J-band frame with magnitude J ~ 17.2 (Vega) at a mid-time 99.3 hrs post-burst. The magnitude was calibrated with the nearby 2MASS catalog and without the Galactic extinction correction. We acknowledge the excellent support from T.Q. Chen for enabling these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/44117. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42237] GRB 260325A: Fermi GBM Final Localization
by GCN Circulars 26 Mar '26

26 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44116 SUBJECT: GRB 260325A: Fermi GBM Final Localization DATE: 26/03/26 02:06:55 GMT FROM: Suman Bala at USRA <sumanbala2210(a)gmail.com> The Fermi GBM team reports the detection of a likely LONG GRB "At 23:39:37.55 UT on 25 March 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260325A (trigger 796174782/260325986). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 113.3, Dec = -59.7 (J2000 degrees, equivalent to J2000 7h 33m, -59d 43'), with a statistical uncertainty of 3.2 degrees. The angle from the Fermi LAT boresight is 134 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260325986/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260325986/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260325986/…" View this GCN Circular online at https://gcn.nasa.gov/circulars/44116. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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