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[vsnet-grb-info 42343] EP260405a: Einstein Probe detection of a fast X-ray transient
by GCN Circulars 06 Apr '26

06 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44222 SUBJECT: EP260405a: Einstein Probe detection of a fast X-ray transient DATE: 26/04/06 04:04:37 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> R.-Z. Li (YNAO), Y. J. Yi (BNU), H.Q. Cheng and Z.-X. Ling (NAOC) on behalf of the Einstein Probe (EP) team: We report on the detection of a fast X-ray transient, designated EP260405a by the Wide-field X-ray Telescope (WXT) on the Einstein Probe (EP) mission (EP/WXT trigger ID: 11900672904), and followed by COLIBRI (Lincetto et al. GCN #44220). The X-ray flare started at T0 = 2026-04-05T03:46:27 (UTC) with a duration of about 150s. The WXT position of the source is R.A. = 184.423 deg, DEC = -20.156 deg (J2000) with an uncertainty of 3 arcmin in radius (90% C.L. statistical and systematic). The WXT spectrum can be fitted by an absorbed powerlaw model with a fixed Galactic column density of 4.83 x 10^20 cm^-2, and a photon index of 2.0 (-0.4, +0.4). The 0.5-4 keV unabsorbed flux is 4.2 (-0.9, +1.2) x 10^-10 erg/cm^2/s. A follow-up observation with the Follow-up X-ray Telescope (FXT) was conducted, beginning at 2026-04-05T16:23:25 (UTC) with an exposure time of 3ks. Within the EP/WXT error circle, no significant X-ray source was detected in the EP/FXT data, yielding an upper limit of 5 x 10^-14 erg/cm^2/s (90% C.L.). 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/44222. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42342] The EP-WXT trigger 01709259621 is likely a flaring star
by GCN Circulars 06 Apr '26

06 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44221 SUBJECT: The EP-WXT trigger 01709259621 is likely a flaring star DATE: 26/04/06 02:18:37 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Tian-Yu Liu, R.H. Yao, Chen Wang and C.C. Jin (NAOC) on behalf of the Einstein Probe (EP) team: The EP-WXT trigger 01709259621 at the time of 2026-04-05T 22:38:24, is likely a stellar flare associated with LP 368-99. The estimated flux of the flare is around 1e-10 erg/s/cm^2 in 0.5-4.0 keV, corresponding to an X-ray luminosity of around 1.27e31 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/44221. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42341] EP260405.149 / EP-WXT 11900672904: COLIBRÍ optical upper limits
by GCN Circulars 05 Apr '26

05 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44220 SUBJECT: EP260405.149 / EP-WXT 11900672904: COLIBRÍ optical upper limits DATE: 26/04/05 16:04:19 GMT FROM: Massimiliano Lincetto at Aix Marseille Univ, CNRS/IN2P3, CPPM <lincetto(a)cppm.in2p3.fr> Massimiliano Lincetto (CPPM), Alan M. Watson (UNAM), Jean-Grégoire Ducoin (CPPM), 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), Rosa L. Becerra (UNAM), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Francis Fortin (IRAP), Leonardo García García (UNAM), Ramandeep Gill (UNAM), Noémie Globus (UNAM), Marion Guelfand (CPPM), Asuka Kuwata (UNAM), Nikos Mandarakas (LAM), Diego López-Cámara (UNAM), Francesco Magnani (CPPM), Enrique Moreno Méndez (UNAM), 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 EP-WXT transient EP260405.149 using the DDRAGO two-channel wide-field imager on the COLIBRÍ telescope. Observation started within 30 seconds from the alert reception. We observed on 2026-04-05 from 09:51:17 to 10:30:32 UTC (from 6.25 to 7 hours after the trigger T0) and obtained 1920 seconds of simultaneous exposure in the r and z filters. The data were reduced and co-added with the COLIBRÍ pipeline and analysed with STDWeb/STDPipe (Karpov 2025). The photometry was calibrated using nearby stars from the PanSTARRS DR2 catalog, is in the AB system, and is not corrected for Galactic extinction. In the stacked image, we do not detect any new source at the WXT source position down to the following 3-sigma limit: r > 21.11 z > 20.57 Further observations may be planned. 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/44220. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42340] The EP-WXT trigger 01709259615 is likely a flaring star
by GCN Circulars 05 Apr '26

05 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44219 SUBJECT: The EP-WXT trigger 01709259615 is likely a flaring star DATE: 26/04/05 12:27:55 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> R.-Z. Li (YNAO), Y. J. Yi (BNU), H.Q. Cheng and Z.-X. Ling (NAOC) on behalf of the Einstein Probe (EP) team: The EP-WXT trigger 01709259615 at the time of 2026-04-05T12:01:49, is likely a stellar flare associated with RX J1411.0+0751. The estimated flux of the flare is around 1e-10 erg/s/cm^2 in 0.5-4.0 keV, corresponding to an X-ray luminosity of around 1.4e31 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/44219. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42339] Fermi trigger No 797039833: Global MASTER-Net observations report
by GCN Circulars 05 Apr '26

05 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44218 SUBJECT: Fermi trigger No 797039833: Global MASTER-Net observations report DATE: 26/04/05 11:00:42 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), D.Buckley (SAAO), 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) MASTER-OAFA robotic telescope [1] located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB260404.99 (trigger No 797039833,12h 09m 43.20s , -35d 10m 48.0s, R=16.55) errorbox 21767 sec after notice time and 21798 sec after trigger time at 2026-04-05 06:00:27 UT, with upper limit up to 19.5 mag. The observations began at zenith distance = 19 deg. The sun altitude is -58.3 deg. The galactic latitude b = 27 deg., longitude l = 294 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3232826 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 21859 | 2026-04-05 06:00:27 | MASTER-OAFA | (12h 59m 32.15s , -41d 01m 29.5s) | C | 120 | 18.4 | 23083 | 2026-04-05 06:21:21 | MASTER-OAFA | (12h 37m 40.74s , -42d 05m 50.7s) | C | 60 | 17.6 | 23143 | 2026-04-05 06:21:21 | MASTER-OAFA | (12h 37m 40.75s , -42d 05m 50.7s) | C | 180 | 18.7 | Coadd 23163 | 2026-04-05 06:22:42 | MASTER-OAFA | (12h 48m 26.86s , -42d 07m 29.9s) | C | 60 | 17.5 | 23240 | 2026-04-05 06:23:58 | MASTER-OAFA | (12h 37m 42.77s , -42d 05m 40.4s) | C | 60 | 18.3 | 23334 | 2026-04-05 06:25:32 | MASTER-OAFA | (12h 48m 27.14s , -42d 06m 12.0s) | C | 60 | 19.2 | 23409 | 2026-04-05 06:26:48 | MASTER-OAFA | (12h 37m 39.06s , -42d 07m 24.1s) | C | 60 | 19.1 | 23525 | 2026-04-05 06:28:43 | MASTER-OAFA | (12h 35m 41.78s , -40d 12m 31.0s) | C | 60 | 18.5 | 23585 | 2026-04-05 06:28:43 | MASTER-OAFA | (12h 35m 41.77s , -40d 12m 31.0s) | C | 180 | 19.5 | Coadd 23600 | 2026-04-05 06:29:59 | MASTER-OAFA | (12h 46m 10.91s , -40d 11m 40.1s) | C | 60 | 19.2 | 23676 | 2026-04-05 06:31:14 | MASTER-OAFA | (12h 35m 48.78s , -40d 12m 30.1s) | C | 60 | 19.2 | 23761 | 2026-04-05 06:32:39 | MASTER-OAFA | (12h 46m 18.29s , -40d 12m 02.0s) | C | 60 | 19.1 | 23837 | 2026-04-05 06:33:55 | MASTER-OAFA | (12h 35m 41.12s , -40d 12m 28.9s) | C | 60 | 19.1 | 23932 | 2026-04-05 06:35:30 | MASTER-OAFA | (12h 49m 34.20s , -47d 48m 23.1s) | C | 60 | 19.1 | 24013 | 2026-04-05 06:36:51 | MASTER-OAFA | (13h 01m 25.31s , -47d 50m 17.4s) | C | 60 | 19.1 | 24089 | 2026-04-05 06:38:07 | MASTER-OAFA | (12h 49m 34.19s , -47d 49m 47.0s) | C | 60 | 19.1 | 35699 | 2026-04-05 09:51:38 | MASTER-OAFA | (12h 18m 08.46s , -19d 48m 02.5s) | C | 60 | 16.7 | 35759 | 2026-04-05 09:51:38 | MASTER-OAFA | (12h 18m 08.45s , -19d 48m 02.5s) | C | 180 | 17.1 | Coadd 35765 | 2026-04-05 09:52:43 | MASTER-OAFA | (12h 18m 08.49s , -19d 48m 02.4s) | C | 60 | 16.6 | 35830 | 2026-04-05 09:53:49 | MASTER-OAFA | (12h 18m 08.48s , -19d 48m 02.4s) | C | 60 | 16.5 | 35896 | 2026-04-05 09:54:55 | MASTER-OAFA | (12h 18m 08.55s , -19d 48m 02.6s) | C | 60 | 16.5 | 35956 | 2026-04-05 09:54:55 | MASTER-OAFA | (12h 18m 08.55s , -19d 48m 02.7s) | C | 180 | 16.6 | Coadd 35962 | 2026-04-05 09:56:00 | MASTER-OAFA | (12h 18m 08.56s , -19d 48m 02.5s) | C | 60 | 16.4 | 36028 | 2026-04-05 09:57:06 | MASTER-OAFA | (12h 18m 08.63s , -19d 48m 02.7s) | C | 60 | 16.2 | 36095 | 2026-04-05 09:58:13 | MASTER-OAFA | (12h 18m 08.72s , -19d 48m 03.5s) | C | 60 | 16.0 | 36155 | 2026-04-05 09:58:13 | MASTER-OAFA | (12h 18m 08.72s , -19d 48m 03.6s) | C | 180 | 16.3 | Coadd 36160 | 2026-04-05 09:59:18 | MASTER-OAFA | (12h 18m 08.73s , -19d 48m 03.4s) | C | 60 | 16.0 | 36225 | 2026-04-05 10:00:24 | MASTER-OAFA | (12h 18m 08.80s , -19d 48m 03.7s) | C | 60 | 15.8 | 36291 | 2026-04-05 10:01:30 | MASTER-OAFA | (12h 18m 08.89s , -19d 48m 03.9s) | C | 60 | 15.7 | 36357 | 2026-04-05 10:02:35 | MASTER-OAFA | (12h 18m 08.96s , -19d 48m 04.3s) | C | 60 | 15.5 | 36423 | 2026-04-05 10:03:41 | MASTER-OAFA | (12h 18m 09.09s , -19d 48m 04.8s) | C | 60 | 15.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/44218. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42338] GRB 260403A: GECAM-B observation of a long burst
by GCN Circulars 05 Apr '26

05 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44217 SUBJECT: GRB 260403A: GECAM-B observation of a long burst DATE: 26/04/05 07:34:52 GMT FROM: Xinghao Luo at IHEP <2952704891(a)qq.com> Xing-Hao Luo, Chen-Wei Wang, Shao-Lin Xiong (IHEP) report on behalf of GECAM team: GECAM-B was triggered in-flight by GRB 260433A, at 2026-04-03T02:31:29.500 UTC (denoted as T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #44195) and AstroSat CZTI (A. Goyal et.al., GCN#44202). According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of a single pulse with a duration (T90) of 24.5 +3.0/-4.0 s. The GECAM-B light curve can be found here: https://www.bursthub.cn//admin/static/gecambgrb260403A.png Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission originally consists of two micro-satellites (GECAM-A and GECAM-B) launched in Dec. 2020. As the third member of GECAM constellation, GECAM-C was launched onboard SATech-01 experimental satellite in July 2022. GECAM mission is funded by the Chinese Academy of Sciences (CAS). View this GCN Circular online at https://gcn.nasa.gov/circulars/44217. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42337] EP260324A / AT 2026hir: COLIBRÍ further optical observations
by GCN Circulars 05 Apr '26

05 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44216 SUBJECT: EP260324A / AT 2026hir: COLIBRÍ further optical observations DATE: 26/04/05 05:38:58 GMT FROM: Alan Watson at UNAM <alan(a)astro.unam.mx> Alan M. Watson (UNAM), Massimiliano Lincetto (CPPM), Rosa L. Becerra (UNAM), Noémie Globus (UNAM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Edilberto Aguilar-Ruiz (UNAM), Jean-Luc Atteia (IRAP), Dalya Akl (NYUAD), 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), Marion Guelfand (CPPM), Asuka Kuwata (UNAM), Nikos Mandarakas (LAM), Diego López-Cámara (UNAM), Francesco Magnani (CPPM), Enrique Moreno Méndez (UNAM), Margarita Pereyra (UNAM), Ny Avo Rakotondrainibe (LAM), Fredd Sánchez Álvarez (UNAM), Benjamin Schneider (LAM) and Antonio de Ugarte Postigo (LAM) report: We observed AT2026hir/ZTF26aapviim, the optical counterpart (Anumarlapudi et al., GCN Circ. 44120, Stein et al., GCN Circ. 44194, Globus et al., GCN Circ. 44196) of EP260324a (Wu et al., Atel #17728), with the DDRAGO two-channel wide-field imager on the COLIBRÍ telescope. We observed from 2026-04-05 03:10 to 03:26 UTC (from 11.95 to 11.96 days after the discovery time reported in the TNS record and from 11.84 to 11.85 days after the EP trigger) and obtained 5 minutes of exposure in each of the g, r, i filters, and 15 minutes of simultaneous exposure in the z filter. The data were reduced and coadded with the ASU 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. In the stacked image, we detect the optical counterpart. The preliminary PSF-fitting magnitudes after performing image subtraction using PanSTARRS DR1 images as a template are: r = 18.01 +/- 0.01, z = 18.54 +/- 0.02. Compared to our previous observations from 2026-04-03 (Globus et al., GCN Circ. 44196), we see an apparently achromatic fading of: delta r = 0.28 +/- 0.01, delta z = 0.28 +/- 0.03. Further observations are planned. 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. View this GCN Circular online at https://gcn.nasa.gov/circulars/44216. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42336] Fermi Gamma-ray Burst Monitor trigger 796972356/260404217 is not a GRB
by GCN Circulars 04 Apr '26

04 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44215 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 796972356/260404217 is not a GRB DATE: 26/04/04 07:18:24 GMT FROM: Rushikesh Sonawane at IISER, TVM <rushikesh23(a)iisertvm.ac.in> R. Sonawane (IISER, TVM) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 796972356/260404217 at 05:12:31.90 UT on 04 April 2026, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to Local Particles." View this GCN Circular online at https://gcn.nasa.gov/circulars/44215. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42335] EP260403a: refined analysis of the EP-WXT and EP-FXT observations
by GCN Circulars 04 Apr '26

04 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44214 SUBJECT: EP260403a: refined analysis of the EP-WXT and EP-FXT observations DATE: 26/04/04 06:09:17 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> C.-Y. Dai (NJU), R.-Z. Li (YNAO), C.-L. Guo, and W.-D. Zhang (NAO, CAS) on behalf of the Einstein Probe (EP) team: The fast X-ray transient EP260403a was detected by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission (Guo et al., GCN 44204). Optical follow-up of EP260403a revealed a fading counterpart, first identified by COLIBRÍ (Antier et al., GCN 44206) and subsequently confirmed by LCO (Pérez-Fournon et al., GCN 44207; Quirola-Vasquez et al., GCN 44209). The burst beginning at T0 = 2026-04-03 10:27:45 (UTC). The WXT observation lasted for approximately 50 seconds, and was interrupted due to the autonomous follow-up observation. The WXT light curve exhibits a single-peaked structure. The average WXT 0.5-4 keV spectrum can be fitted with an absorbed power-law model, with the hydrogen column density fixed at the Galactic value of 5.6×10^20 cm^-2 and a photon index of 0.3 (-0.3/+0.3). The derived average unabsorbed flux in the 0.5-4 keV band is 1.6 (-0.3/+0.3) × 10^-9 erg s^-1 cm^-2. The Follow-up X-ray Telescope (FXT) on board EP observed this source autonomously at 2026-04-03 10:33:22 (UTC, T0+337 s). The exposure time of this observation is 3.6 ks. On-ground analysis of the FXT data found an uncatalogued fading source at R.A., Dec. = 219.1556, -25.5045 (J2000) with an uncertainty of about 10 arcsec (radius, 90% C.L. statistical and systematic), which is consistent with the WXT position. The average FXT 0.5-10 keV spectrum can be fitted with an absorbed power-law model, with the hydrogen column density fixed at the Galactic value and a photon index of 1.94 (-0.02/+0.02). The derived average unabsorbed flux in the 0.5-10 keV band is 6.4 (-0.1/+0.1)×10^-11 erg s^-1 cm^-2. A follow-up observation with the EP/FXT was planned, and further information will be updated when the telemetry data are received. 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/44214. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42334] The EP-WXT trigger 01709259586 is likely a flaring star
by GCN Circulars 04 Apr '26

04 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44213 SUBJECT: The EP-WXT trigger 01709259586 is likely a flaring star DATE: 26/04/04 06:05:02 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Q.Y. Wu, X.X. Sun, W. Chen (NAO,CAS), Y.J. Yi (BNU), Y. Liu (NAO, CAS) on behalf of the Einstein Probe (EP) team: The EP-WXT trigger 01709259586 at the time of 2026-04-04T05:19:38, is likely a stellar flare associated with UCAC4 498-055345. The estimated flux of the flare is around 8 x 10^-11 erg/s/cm^2 in 0.5-4.0 keV, corresponding to an X-ray luminosity of around 1 x 10^33 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/44213. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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