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[vsnet-grb-info 42710] GRB 260511B: SAO RAS optical observations
by GCN Circulars 12 May '26

12 May '26

TITLE: GCN CIRCULAR NUMBER: 44582 SUBJECT: GRB 260511B: SAO RAS optical observations DATE: 26/05/12 15:32:19 GMT FROM: Alexander Moskvitin at SAO RAS <mosk(a)sao.ru> A. Moskvitin (SAO RAS) and A. Pozanenko (IKI), report on behalf of GRB the follow-up team. We observed the field of the GRB 260511B discovered by Fermi (The Fermi GBM team, GCN 44542; Roberts, GCN 44554), SVOM (Godet et al., GCN 44543), NuSTAR (Waratkar and Grefenstette, GCN 44556), AstroSat CZTI (Arya et al., GCN 44560); EP-FXT (Fu et al., GCN 44578) with the Zeiss-1000, 1m telescope of the SAO RAS equipped with the CCD photometer. Observations were performed in B, V, Rc, Ic filters and started on May 11, 19:08:40 UT (8.14 hours after the trigger). The OT (Wu et al., GCN 44547; Sasada et al., GCN 44549; Jiang et al., GCN 44551; Wu et al., GCN 44552; Vijaykumar et al., GCN 44561; de Ugarte Postigo et al., GCN 44565; Lee et al., GCN 44567; Li et al., GCN 44568; Wang et al., GCN 44571; Belkin et al., GCN 44572; Adami et al., GCN 44573; Saccardi et al., GCN 44574; Rajabov et al., GCN 44576; Pérez-Fournon et al., GCN 44577; Novotný et al., GCN 44580; also detected in NIR by Li et al., GCN 44557) is clearly detected in all frames with the following brightness. Date T_start T_end t_mid-T0, exp, s filter mag +/- err UT hours 2026-05-11T19:14:19--19:54:19 8.56306 3*300 B 19.56 +/- 0.03 2026-05-11T19:20:15--19:40:09 8.49444 2*120 V 19.09 +/- 0.04 2026-05-11T19:08:40--19:43:12 8.42333 3*120 Rc 18.75 +/- 0.02 2026-05-11T19:11:24--19:51:31 8.51542 5*120 Ic 18.50 +/- 0.05 This preliminary photometry is based on nearby SDSS stars (using Lupton 2005 transformation equations) and is not corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/44582. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42709] GRB 260510D: Glowbug gamma-ray detection of a likely short burst
by GCN Circulars 12 May '26

12 May '26

TITLE: GCN CIRCULAR NUMBER: 44581 SUBJECT: GRB 260510D: Glowbug gamma-ray detection of a likely short burst DATE: 26/05/12 14:39:43 GMT FROM: C.C. Cheung at Naval Research Lab <Teddy.Cheung(a)nrl.navy.mil> C.C. Cheung, R. Woolf, M. Kerr, J.E. Grove (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge, D. Kocevski (MSFC), and M.S. Briggs (UAH) report: The Glowbug gamma-ray telescope [1,2,3], operating on the International Space Station, reports the detection of the likely short burst GRB 260510D, which was detected by Fermi/GBM (GCN 44523). Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2026-05-10 20:38:07.656 with a duration of 0.13 s and a total significance of about 9.7 sigma. The lightcurve comprises a single peak. The analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS. Glowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Program’s STP-H9 to the ISS and operated until 2024 April when it was put in safe storage on orbit. Glowbug was removed from storage and resumed operation on 2025 September 12. [1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959 [2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O [3] Woolf, R.S. et al. 2024, Proc. SPIE, 13151, id. 1315108 Distribution Statement A: Approved for public release. Distribution is unlimited. View this GCN Circular online at https://gcn.nasa.gov/circulars/44581. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42708] GRB 260511B: FRAM-ORM optical detection
by GCN Circulars 12 May '26

12 May '26

TITLE: GCN CIRCULAR NUMBER: 44580 SUBJECT: GRB 260511B: FRAM-ORM optical detection DATE: 26/05/12 13:59:31 GMT FROM: Filip Novotný at Masaryk University <filip.novotny(a)talentovani.cz> Filip Novotný, Martin Jelínek, Jan Štrobl (ASU CAS Ondrejov, CZ), Sergey Karpov, Martin Mašek, Petr Janeček, Jakub Juryšek, Jan Ebr, Ronan Cunniffe, Petr Travníček and Michael Prouza (Institute of Physics, Prague, CZ) report: We observed the field of GRB 260511B detected by Fermi/GBM (Fermi GBM Team, GCN 44542) and SVOM/ECLAIRs (Godet et al., GCN 44543) with the FRAM robotic telescope at the Observatorio del Roque de los Muchachos (ORM), La Palma, Spain. Observations were carried out in the clear filter from T+9.6 hr to T+17.4 hr with 60-second exposures stacked per epoch. The optical afterglow(Wu et al., GCN 44547 ; Sasada et al., GCN 44549 ; Jiang et al., GCN 44551 ; Wu et al., GCN 44552 ; Li et al., GCN 44557 ; Vijaykumar et al., GCN 44561 ; de Ugarte Postigo et al., GCN 44565 ; Lee et al., GCN 44567; Li et al., GCN 44568; Wang et al., GCN 44571; Belkin et al., GCN 44572) of GRB 260511B (FERMI team, GCN 44542 ; Godet et al., GCN 44543; Roberts et al., GCN 44554; Waratkar et al., GCN 44556; Arya et al., GCN 44560) is clearly detected throughout the night, fading from CR = 18.89 +/- 0.10 at T+9.8 hr till about T+16 hr, when the target terminated due to dawn. Magnitudes were reduced using the PyRT pipeline and calibrated to r-band AB magnitudes against the ATLAS catalog. No correction for Galactic extinction has been applied. Fitting a power law F(t) ~ t^(-alpha) to our data yields alpha = 1.39 +/- 0.29, consistent with the power-law decay reported by earlier observers (GCN 44547, 44549, 44551, 44561). View this GCN Circular online at https://gcn.nasa.gov/circulars/44580. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42707] GRB 260511A: EP-FXT follow-up observation
by GCN Circulars 12 May '26

12 May '26

TITLE: GCN CIRCULAR NUMBER: 44579 SUBJECT: GRB 260511A: EP-FXT follow-up observation DATE: 26/05/12 13:12:09 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> S.-Y. Fu (HUST), X. Tian (GXU), H.-N. Yang, Z.-X. Ling (NAOC, CAS) on behalf of the Einstein Probe (EP) team: EP-FXT performed a follow-up observation of the SVOM/ECLAIRs-detected burst GRB 260511A (SVOM/sb26051101, Godet et al., GCN 44532), which also triggered Fermi-GBM (Fermi GBM team, GCN 44529). The follow-up obervation started at 2026-05-11T07:00:13 UTC, approximately 46.7 minutes after the SVOM trigger, with a total exposure time of 2.2ks. On-ground analysis of the FXT data found an uncatalogued fading source at R.A., Dec. = 197.8992, -33.8042 (J2000) with an uncertainty of about 10 arcsec (radius, 90% C.L. statistical and systematic) near the ECLAIRs error circle. This position is consistent with the optical counterpart reported by TRT (Jiang et al., GCN 44533) and FM-GFT (Akl et al. GCN 44534). The average FXT 0.3-10 keV spectrum can be fitted with an absorbed power-law model, with the hydrogen column density fixed at the Galactic value, adittional hydrogen column density of 5.9 (+-1.3) ×10^20 cm^-2, and a photon index of 1.93 +- 0.05. The derived average unabsorbed flux in the 0.3-10 keV band is 6.33 (+-0.18)×10^-11 erg s^-1 cm^-2. 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/44579. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42706] GRB 260511B: EP-FXT follow-up observation
by GCN Circulars 12 May '26

12 May '26

TITLE: GCN CIRCULAR NUMBER: 44578 SUBJECT: GRB 260511B: EP-FXT follow-up observation DATE: 26/05/12 12:55:37 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> S.-Y. Fu (HUST), X. Tian (GXU), H.-N. Yang, Z.-X. Ling (NAOC, CAS) on behalf of the Einstein Probe (EP) team: EP-FXT performed a follow-up observation of GRB 260511B detected by Fermi/GBM (the Fermi GBM team, GCN 44542) and SVOM/ECLAIRs (SVOM/sb26051102, Godet et al., GCN 44543). The follow-up obervation started at 2026-05-11T11:41:41 UTC, approximately 40.7 minutes after the SVOM trigger, with a total exposure time of 5.9 ks. On-ground analysis of the FXT data found an uncatalogued fading source at R.A., Dec. = 192.574, 4.0549 (J2000) with an uncertainty of about 10 arcsec (radius, 90% C.L. statistical and systematic) near the ECLAIRs error circle. This position is consistent with the optical counterpart reported by SVOM/C-GFT (Wu et al., GCN 44547) and MITSuME (Sasada et al. GCN 44549). The average FXT 0.3-10 keV spectrum can be fitted with an absorbed power-law model, with the hydrogen column density fixed at the Galactic value, intrinsic hydrogen column density of 3.8 (+-0.10) ×10^21 cm^-2, and a photon index of 2.10 +- 0.04. The derived average unabsorbed flux in the 0.3-10 keV band is 2.07 (+-0.05)×10^-11 erg s^-1 cm^-2. 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/44578. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42705] GRB 260511B: LCO optical counterpart detection
by GCN Circulars 12 May '26

12 May '26

TITLE: GCN CIRCULAR NUMBER: 44577 SUBJECT: GRB 260511B: LCO optical counterpart detection DATE: 26/05/12 12:22:26 GMT FROM: Ismael Perez-Fournon at Instituto de Astrofisica de Canarias <ipf(a)iac.es> I. Pérez-Fournon (IAC and ULL), F. Poidevin (IAC and ULL), D. Cano-Morales, A.E. Hernández-Díaz, I. Correa-Plasencia, E. Lekaroz-Urriza, M. Quintana-Ansaldo (all ULL), A. López-Oramas (IAC and ULL), and D. Aguado (IAC and ULL) We report on Las Cumbres Observatory (LCO) observations of the long GRB 260511B, detected by Fermi GBM (Fermi GBM team, GCN circ. 44542; Roberts et al., GCN circ. 44554), SVOM ECLAIRs and MXT (Godet et al., GCN circ. 44543), NuSTAR (Waratkar and Grefenstette, GCN circ. 44556), and AstroSat (Arya et al., GCN circ. 44560). We observed the field of GRB 260511B with one of the two LCO 1-m telescopes equipped with Sinistro cameras located at the LCO node at McDonald Observatory, Texas, in the SDSS r´ (300 sec), g' (200 sec), and i' (200 sec) filters. The first observation, in the SDSS r' filter, started on 2026-05-12 at 03:00:47 UT, 16.00 hours after the Fermi and SVOM trigger. The optical conterpart, first reported by Wu et al. (GCN circ. 44547), at a redshift of z = 2.006 (de Ugarte Postigo et al., GCN circ. 44565; Wang et al., GCN circ. 44571; and Adami et al., GCN circ. 44573), is clearly detected in our LCO images. The AB magnitudes, calibrated against PanSTARRS-1 DR2 stars and not corrected for Galactic extinction are: r' = 19.81 +/- 0.06 (mid-time 16.05 hours after the trigger) g' = 20.21 +/- 0.06 (mid-time 16.67 hours after the trigger) i' = 19.71 +/- 0.07 (mid-time 16.73 hours after the trigger) These results are consistent with other optical and near-IR detections of the afterglow (Wu et al., GCN circ. 44547; Sasada et al., GCN circ. 44549; Jiang et al., GCN circ. 44551; Wu et al., GCN circ. 44552; Li et al., GCN circ. 44557; Vijaykumar et al., GCN circ. 44561; de Ugarte Postigo et al., GCN circ. 44565; Lee et al., GCN circ. 44567; Li et al., GCN circ. 44568; Wang et al., GCN circ. 44571; Belkin et al., GCN circ. 44572; Adami et al., GCN circ. 44573; Saccardi et al., GCN circ. 44574); and Rajabov et al., GCN circ. 44576). This work makes use of observations from the Las Cumbres Observatory global telescope network (LCO program IAC2026A-011, SGLF and Superluminous Supernovae surveys). This work made use of the Astro-COLIBRI platform (P. Reichherzer et al. 2021, ApJS, 256, 5). View this GCN Circular online at https://gcn.nasa.gov/circulars/44577. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42704] GRB260511B: MAO/AZT-22 optical observations
by GCN Circulars 12 May '26

12 May '26

TITLE: GCN CIRCULAR NUMBER: 44576 SUBJECT: GRB260511B: MAO/AZT-22 optical observations DATE: 26/05/12 11:51:54 GMT FROM: Yodgor Rajabov at UBAI <rajabov(a)astrin.uz> Y. Rajabov, B.Abidkhanov, O. Burkhonov, S. Ehgamberdiev, Y. Tillayev (UBAI), T. Boyqobilov, A. Shaymanov (Maidanak Observatory/UBAI) report on behalf of UBAI team. We observed the field of GRB 260511B detected by SVOM (Godet et al., GCN 44543) and Fermi (Fermi GBM team, GCN 44542) with the AZT-22 1.5m telescope of the Maidanak Observatory (MAO) starting on 2026-05-11 at 16:49:08 UT, i.e, ~6.81 hours after the FERMI GBM trigger. In total we obtained 6x300 s exposures in the R-band using 4kx4k CCD SNUCAM camera (Im et al., 2010). We detect the optical counterpart reported by many teams (Wu et al., GCN 44547; Sasada et al., GCN 44549; Jiang et al., GCN 44551; Wu et al., GCN 44552; Vijaykumar et al., GCN 44561; de Ugarte Postigo et al., GCN 44565; Lee et al., GCN 44567; Li et al., GCN 44568; Belkin et al., GCN 44572; Saccardi et al., GCN 44574). Preliminary photometry is as follows: Date UTstart Exptime t-T0 Filter OT Err. UL SNR Site/Telescope (nxs) (hours) 2026-05-11 16:49:08 6x300 6.81 R 18.32 0.01 23.0 142 MAO/AZT-22 The red shift (z = 2.006) measured by de Ugarte Postigo et al., GCN 44565. Then confirmed by Wang et al., GCN 44571 and Adami et al., GCN 44573. All the data have been reduced by a single data processing pipeline, STDPipe (Karpov et al., 2022). Images obtained in Johnson Cousins filters were calibrated using the Gaia DR3 Synphot catalog. We used PanSTARRS DR2 catalog for template subtraction. 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/44576. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42703] GRB 260511A: SVOM/VT optical observations
by GCN Circulars 12 May '26

12 May '26

TITLE: GCN CIRCULAR NUMBER: 44575 SUBJECT: GRB 260511A: SVOM/VT optical observations DATE: 26/05/12 09:53:21 GMT FROM: Huali Li at at NAOC, SVOM <lhl(a)nao.cas.cn> H. L. Li, C. Wu, Y. L. Qiu, L. P. Xin, Y. N. Ma, Z. H. Yao, J. R. Xu, X. H. Han, J. Wang, Y. Xu, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, L. Lan, J. S. Deng, J. Y. Wei (NAOC), J. Palmerio (CEA/Irfu) report on behalf of the SVOM/VT team. SVOM/VT performed ToO observations of GRB260511A triggered by SVOM/ECLAIRs (sb26051101, Godet et al., GCN 44532). The burst was also detected by Fermi/GBM (Fermi GBM team, GCN 44529; Preis et al., GCN 44531; Preis et al., GCN 44531; Roberts et al., GCN 44548) and NuSTAR (Waratkar et al. GCN 44555). The observation started at 2026-05-11T22:13:58 UTC, about 16.0 hours post trigger in the VT_B (400-650 nm) and VT_R (650-1000 nm) channels simultaneously. The afterglow (Jiang et al., GCN 44533; Akl et al. GCN 44534; Saccardi et al. GCN 44535; Zheng et al. GCN 44536; Wu et al., GCN 44538, Harper et al., GCN 44545; Brivio et al., GCN 44562) was detected in stack images of both channels. The following measurements are in the AB magnitude and are not corrected for Galactic extinction: Mid time | Band | Exposure Time | Brightness 18.00 h VT_B 35*70 s 23.43 +/- 0.27 mag 18.00 h VT_R 39*70 s 21.82 +/- 0.13 mag 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. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC), CAS. View this GCN Circular online at https://gcn.nasa.gov/circulars/44575. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42702] GRB 260511B: LCO optical observations
by GCN Circulars 12 May '26

12 May '26

TITLE: GCN CIRCULAR NUMBER: 44574 SUBJECT: GRB 260511B: LCO optical observations DATE: 26/05/12 09:48:43 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> A. Saccardi (CEA/Irfu), C. Wu (NAOC), J. X. Cao (GXU), L. Zhang (IHEP), D. Kong (GXU), report on behalf of the SVOM mission team: We observed the field of the SVOM/ECLAIRs GRB 260511B (Godet et al., GCN 44543), also detected by Fermi/GBM (Fermi GBM team, GCN 44542; Roberts et al., GCN 44554), NuSTAR (Waratkar et al., GCN 44556), and AstroSat (Arya et al., GCN 44560), with the LCO 1m telescope at Cerro Tololo Observatory equipped with the Sinistro instrument. Our observation started on 2026-05-12 at 00:14:08 UT (about 13.23 hr after the trigger) and we obtained 3x200 s exposures in the SDSS r and 3x200 s exposures in the Pan-STARRS z filters. The optical counterpart (Wu et al., GCN 44547; Sasada et al., GCN 44549; Jiang et al., GCN 44551; Wu et al., GCN 44552; Li et al., GCN 44557; Vijaykumar et al., GCN 44561; de Ugarte Postigo et al., GCN 44565; Lee et al. GCN 44567; Li et al., GCN 44568; Wang et al., GCN 44571; Belkin et al., GCN 44572; Adami et al., GCN 44573) is clearly detected in our images. We measure the following magnitudes calibrated against the Pan-STARRS DR1 catalog, and not corrected for Galactic extinction: r = 19.68 +/- 0.02 AB (mid-time 13.29 hr after the trigger); z = 19.71 +/- 0.09 AB (mid-time 18.14 hr after the trigger). This project is funded by the SVOM collaboration. View this GCN Circular online at https://gcn.nasa.gov/circulars/44574. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42701] GRB 260511B: OHP/T193 spectroscopic observations
by GCN Circulars 12 May '26

12 May '26

TITLE: GCN CIRCULAR NUMBER: 44573 SUBJECT: GRB 260511B: OHP/T193 spectroscopic observations DATE: 26/05/12 09:05:55 GMT FROM: Christophe Adami at LAM <christophe.adami(a)lam.fr> C. Adami (LAM/Pytheas/AMU), D. Russeil (LAM/Pytheas/AMU), E. Le Floc'h (CEA-Saclay) report on behalf of a larger collaboration and on behalf of the transient team of the OHP 2026 special call: We observed the optical counterpart (Wu et al., GCN 44547 ; Sasada et al., GCN 44549 ; Jiang et al., GCN 44551 ; Wu et al., GCN 44552 ; Li et al., GCN 44557 ; Vijaykumar et al., GCN 44561 ; de Ugarte Postigo et al., GCN 44565 ; Lee et al., GCN 44567; Li et al., GCN 44568; Wang et al., GCN 44571; Belkin et al., GCN 44572) of GRB 260511B (FERMI team, GCN 44542 ; Godet et al., GCN 44543; Roberts et al., GCN 44554; Waratkar et al., GCN 44556; Arya et al., GCN 44560) in spectroscopic mode using the T193cm telescope at Observatoire de Haute-Provence (France) equipped with the MISTRAL spectro-imager. We obtained a total of 145 min of exposures (10min + 15min + 4 x 30min) with the MISTRAL spectroscopic blue setting from 4200 to 8000 AA, starting at 2026-05-11 22:04:34 UT under modest weather conditions. The host environment at z=2.006 detected by the GTC and reported by de Ugarte Postigo et al. (GCN 44565) and Wang et al. (GCN 44571) is visible in our data, in particular with the 2344 AA and 2600 AA (rest-frame) FeII lines observed at a consistent redshift of z=2.007 +/- 0.001. We acknowledge the excellent support from the Observatoire de Haute-Provence and in particular Jean Balcaen. View this GCN Circular online at https://gcn.nasa.gov/circulars/44573. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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