June 2025 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 38769] Fermi Gamma-ray Burst Monitor trigger 771596290/250614513 is not a GRB
by GCN Circulars 14 Jun '25

14 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40729 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 771596290/250614513 is not a GRB DATE: 25/06/14 13:13:42 GMT FROM: Cuán de Barra at UCD <cuan.debarra(a)ucdconnect.ie> C.de Barra (University College Dublin) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 771596290/250614513 at 12:18:05.02 UT on 14 June 2025, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to local particle activity." View this GCN Circular online at https://gcn.nasa.gov/circulars/40729. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38768] GRB 250614A: Fermi GBM Final Real-time Localization
by GCN Circulars 14 Jun '25

14 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40728 SUBJECT: GRB 250614A: Fermi GBM Final Real-time Localization DATE: 25/06/14 12:28:37 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 12:18:05 UT on 14 Jun 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250614A (trigger 771596290.023932 / 250614513). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 343.1, Dec = 54.6 (J2000 degrees, equivalent to J2000 22h 52m, 54d 36'), with a statistical uncertainty of 1.0 degrees. The angle from the Fermi LAT boresight is 1.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250614513/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250614513/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250614513/… View this GCN Circular online at https://gcn.nasa.gov/circulars/40728. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38767] EP250612a / GRB 250612B: NOT optical observations of the afterglow candidate
by GCN Circulars 14 Jun '25

14 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40727 SUBJECT: EP250612a / GRB 250612B: NOT optical observations of the afterglow candidate DATE: 25/06/14 08:29:34 GMT FROM: Antonio Martin-Carrillo at UCD,Space Science Group <antonio.martin-carrillo(a)ucd.ie> A. de Ugarte Postigo (LAM), A. Martin-Carrillo (UCD), G. Corcoran (UCD), D. B. Malesani (DAWN/NBI and Radboud), D. Xu (NAOC), L. Cotter (UCD), B. P. Gompertz (U. Birmingham), A. A. Djupvik (NOT), L. Fuglsang (NOT), report on behalf of a larger collaboration. We observed the field of EP250612a / GRB 250612B detected by EP (Hua et al., GCN 40700) and Fermi (Fermi GBM team, GCN 40702), using the ALFOSC camera mounted on the Nordic Optical Telescope (NOT). We obtained 12x100 s exposures in the SDSS r-band, starting at 23:19 UT on 2025-05-13 (1.952 days after the EP trigger). At J2000 coordinates RA:15:18:36.667, DEC: -26:46:03.624 (error 0.5”), consistent with those by Li et al. (GCN 40716), the optical counterpart is detected in our stacked image with a preliminary magnitude: r = 23.59 +/- 0.22 (AB). The photometric calibration was performed using nearby stars from the Pan-STARRS catalog and the magnitudes are not corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/40727. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38766] Fermi Gamma-ray Burst Monitor trigger 771547945/250613953 is not a GRB
by GCN Circulars 14 Jun '25

14 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40726 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 771547945/250613953 is not a GRB DATE: 25/06/14 00:57:35 GMT FROM: sumanbala2210(a)gmail.com S. Bala (USRA) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 771547945/250613953 at 22:52:20.54 UT on 13 June 2025, 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/40726. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38765] Fermi Gamma-ray Burst Monitor trigger 771541927/250613883 is not a GRB
by GCN Circulars 13 Jun '25

13 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40725 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 771541927/250613883 is not a GRB DATE: 25/06/13 23:39:36 GMT FROM: sumanbala2210(a)gmail.com S. Bala (USRA) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 771541927/250613883 at 21:12:02.66 UT on 13 June 2025, 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/40725. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38764] sb25061218: SVOM/COLIBRÍ (FM-GFT) optical upper limits
by GCN Circulars 13 Jun '25

13 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40724 SUBJECT: sb25061218: SVOM/COLIBRÍ (FM-GFT) optical upper limits DATE: 25/06/13 20:05:07 GMT FROM: Alan Watson at UNAM <alan(a)astro.unam.mx> Alan M. Watson (UNAM), Rosa L. Becerra (U Roma), Enrique Moreno Méndez (UNAM), Sarah Antier (OCA), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Fredd Alvarez (UNAM), Jean-Luc Atteia (IRAP), Camila Angulo (UNAM), Dalya Akl (AUS), Nathaniel R. Butler (ASU) , Damien Dornic (CPPM), Jean-Grégoire Ducoin (CPPM), Francis Fortin (IRAP), Noémie Globus (UNAM), Kin Ocelotl López (UNAM), Diego López-Cámara (UNAM), Francesco Magnani (CPPM), Margarita Pereyra (UNAM), Ny Avo Rakotondrainibe (LAM), Benjamin Schneider (LAM), Antonio de Ugarte Postigo (LAM), and Jerome Rodriguez (CEA): We imaged the field of the SVOM X-ray transient sb25061218 (Rodriguez et al., GCN 40712) using the DDRAGO wide-field imager on the SVOM/COLIBRÍ (FM-GFT) telescope. We observed from 2025-06-13 06:18 to 10:34 UTC (from 9.7 to 14.0 hours after the trigger) and obtained 112 minutes of exposure in the i filter. The data were reduced and coadded with the COLIBRÍ pipeline and analyzed with STDWeb/STDPipe (Karpov 2025). The photometry was calibrated using nearby stars from the Pan-STARRS DR1 catalog, is on the AB scale, and is not corrected for Galactic extinction. In the stacked image, we do not detect any new source within the ECLAIRs source region reported by Rodriguez et al. (GCN 40712) to a formal 10-sigma limit of: i > 23.0, although we note that this is roughly the 50% completion limit of the Pan-STARRS DR1 catalog used to identify new sources. We also performed image subtraction against Pan-STARRS DR2 at the position of the two XRT sources 1 and 2 reported by Evans et al. (GCN Circ. 40721) and see no evidence for optical counterparts to the same limit. 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 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/40724. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38763] sb25061207: SVOM/COLIBRÍ (FM-GFT) optical upper limit
by GCN Circulars 13 Jun '25

13 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40723 SUBJECT: sb25061207: SVOM/COLIBRÍ (FM-GFT) optical upper limit DATE: 25/06/13 19:16:15 GMT FROM: Rosa L. Becerra at Tor Vergata, Roma <rosa.becerra(a)roma2.infn.it> Rosa L. Becerra (U Roma), Alan M. Watson (UNAM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Fredd Alvarez (UNAM), Jean-Luc Atteia (IRAP), Camila Angulo (UNAM), Dalya Akl (AUS), Sarah Antier (OCA), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Jean-Grégoire Ducoin (CPPM), Francis Fortin (IRAP), Leonardo García García (UNAM), Ramandeep Gill (UNAM), Noémie Globus (UNAM), Kin Ocelotl López (UNAM), Diego López-Cámara (UNAM), Francesco Magnani (CPPM), Enrique Moreno Méndez (UNAM), Margarita Pereyra (UNAM), Ny Avo Rakotondrainibe (LAM), Benjamin Schneider (LAM), Antonio de Ugarte Postigo (LAM), L. Zhang (IHEP), and Y. D. Hu (GXU): We imaged the field of the SVOM/ECLAIR sb25061207 (Zhang et al., GCN Circ. 40697) using the DDRAGO wide-field imager on the SVOM/COLIBRÍ (FM-GFT) telescope. We observed from 2025-06-13 03:49 to 05:52 UTC (from 17.36 to 19.41 hours after the trigger) and obtained 63 minutes of exposure in the r filter. The data were reduced and coadded with the COLIBRÍ pipeline and analysed with STDWeb/STDPipe (Karpov 2025). 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 do not detect any new source at the EP/FXT position (Song et al., GCN Circ. 40718) or the optical candidate by SVOM/VT (Li et al. GCN Circ. 40717) down to the following 3-sigma limit: r > 22.9 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 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/40723. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38762] Fermi trigger No 771494087: Global MASTER-Net observations report
by GCN Circulars 13 Jun '25

13 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40722 SUBJECT: Fermi trigger No 771494087: Global MASTER-Net observations report DATE: 25/06/13 18:16:25 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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB250613.33 (trigger No 771494087,17h 33m 19.92s , -38d 28m 01.2s, R=22.7) errorbox 32096 sec after notice time and 32128 sec after trigger time at 2025-06-13 16:50:10 UT, with upper limit up to 17.9 mag. Observations started at twilight. The observations began at zenith distance = 60 deg. The sun altitude is -14.4 deg. The galactic latitude b = -3 deg., longitude l = 351 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2901954 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 32158 | 2025-06-13 16:50:10 | MASTER-SAAO | (16h 41m 27.50s , -39d 04m 53.5s) | C | 60 | 17.8 | 32158 | 2025-06-13 16:50:10 | MASTER-SAAO | (16h 39m 08.66s , -38d 49m 46.2s) | C | 60 | 17.8 | 32346 | 2025-06-13 16:53:18 | MASTER-SAAO | (16h 41m 29.84s , -39d 04m 40.2s) | C | 60 | 17.9 | 32346 | 2025-06-13 16:53:18 | MASTER-SAAO | (16h 39m 10.94s , -38d 49m 34.3s) | C | 60 | 17.9 | 32992 | 2025-06-13 17:04:04 | MASTER-SAAO | (16h 41m 23.49s , -39d 06m 43.4s) | C | 60 | 17.8 | 32992 | 2025-06-13 17:04:04 | MASTER-SAAO | (16h 39m 05.20s , -38d 51m 34.7s) | C | 60 | 17.8 | 33181 | 2025-06-13 17:07:13 | MASTER-SAAO | (16h 41m 25.91s , -39d 05m 03.0s) | C | 60 | 17.9 | 33181 | 2025-06-13 17:07:13 | MASTER-SAAO | (16h 39m 07.41s , -38d 49m 54.4s) | C | 60 | 17.9 | 33369 | 2025-06-13 17:10:21 | MASTER-SAAO | (16h 41m 29.24s , -39d 04m 53.3s) | C | 60 | 17.8 | 33369 | 2025-06-13 17:10:21 | MASTER-SAAO | (16h 39m 10.68s , -38d 49m 45.2s) | C | 60 | 17.8 | 33558 | 2025-06-13 17:13:30 | MASTER-SAAO | (16h 41m 22.46s , -39d 04m 40.0s) | C | 60 | 17.8 | 33558 | 2025-06-13 17:13:30 | MASTER-SAAO | (16h 39m 03.78s , -38d 49m 32.6s) | C | 60 | 17.8 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/40722. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38761] sb25061218: Swift-XRT observations
by GCN Circulars 13 Jun '25

13 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40721 SUBJECT: sb25061218: Swift-XRT observations DATE: 25/06/13 15:59:11 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> P.A. Evans (U. Leicester), J.A. Kennea (PSU), E. Ambrosi (INAF-IASFPA) , A.P. Beardmore (U. Leicester), M.G. Bernardini (INAF-OAB), R. Brivio (INAF-OAB), D.N. Burrows (PSU), S. Campana (INAF-OAB), M. Capalbi (INAF-OAR), A. D'Ai (INAF-IASFPA), P. D'Avanzo (INAF-OAB), V. D'Elia (SSDC & INAF-OAR), S. Dichiara (PSU), M. Ferro (INAF-OAB), A. Melandri (INAF-OAR), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M. Perri (SSDC & INAF-OAR), C. Salvaggio (INAF-OAB), T. Sbarrato (INAF-OAB), B. Sbarufatti (INAF-OAB), M.A. Williams (PSU) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the SVOM/ECLAIRs-detected source sb25061218, collecting 1.7 ks of Photon Counting (PC) mode data between T0+5.9 ks and T0+7.7 ks after the trigger. We have detected 2 sources. These have been automatically classified as follows: * 0 likely counterparts * 0 candidate counterparts * 2 uncatalogued X-ray sources * 0 known X-ray sources Uncatalogued X-ray sources -------------------------- Source 1 (SWIFT J131445.9+544759): ================================== RA (J2000.0): 198.6914 = 13h 14m 45.94s Dec (J2000.0): +54.7999 = +54d 47' 59.6" Error: 11.2 (arcsec, radius, 90% confidence). Detect flag: GOOD Distance: 10.7 arcmin from the SVOM/ECLAIRs position. Mean rate: (9.8 [+3.7, -3.0])e-3 ct s^-1 Mean flux: (4.8 [+1.8, -1.4])e-13 erg cm^-2 s^-1 Peak rate: (9.8 [+3.7, -3.0])e-3 ct s^-1 Peak flux: (4.8 [+1.8, -1.4])e-13 erg cm^-2 s^-1 ECF: 4.85e-11 erg cm^-2 ct^-1, assuming NH=2.15e+20 cm^-2, gamma=1.50; determined from a spectral fit. XMM UL: 2.1e-12 erg cm^-2 s^-1, (0.3-10 keV) so the source is 10.0-sigma above this 3-sigma upper limit. There is no evidence for fading. A SIMBAD object `[VV2006] J131446.6+544804' is 6.6" away. Source 2 (SWIFT J131433.3+544329): ================================== RA (J2000.0): 198.6390 = 13h 14m 33.36s Dec (J2000.0): +54.7249 = +54d 43' 29.6" Error: 9.7 (arcsec, radius, 90% confidence). Detect flag: GOOD Distance: 6.2 arcmin from the SVOM/ECLAIRs position. Mean rate: (5.9 [+2.8, -2.1])e-3 ct s^-1 Mean flux: (1.01 [+0.47, -0.37])e-13 erg cm^-2 s^-1 Peak rate: (5.9 [+2.8, -2.1])e-3 ct s^-1 Peak flux: (1.01 [+0.47, -0.37])e-13 erg cm^-2 s^-1 ECF: 1.71e-11 erg cm^-2 ct^-1, assuming NH=1.76e+22 cm^-2, gamma=7.90; determined from a spectral fit. XMM UL: 2.4e-12 erg cm^-2 s^-1, (0.3-10 keV) so the source is 54.2-sigma above this 3-sigma upper limit. There is no evidence for fading. A SIMBAD object `SDSS J131433.74+544331.8' is 3.9" away. There is 1 2MASS object within the source's 3-sigma error radius. All fluxes are 0.3-10 keV, observed. For all flux conversions and comparisons with catalogues and upper limits from other missions, we assumed a power-law spectrum with NH=3x10^20 cm^-2 and photon index (Gamma)=1.7 unless otherwise stated. The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/SVOM. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/40721. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38760] EP250612a: refined analysis of the EP-WXT and EP-FXT observations
by GCN Circulars 13 Jun '25

13 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40720 SUBJECT: EP250612a: refined analysis of the EP-WXT and EP-FXT observations DATE: 25/06/13 14:07:36 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Y.L.Hua (PMO, CAS), J. W. Hu, T. Zhao, Y. J. Song ,W. Yuan(NAO, CAS) report on behalf of the Einstein Probe team: The fast X-ray transient EP250612a was detected by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission (Hua et al., GCN 40700), and followed up by several optical and X-ray telescopes (Hua et al., GCN 40709, Li et al., GCN 40716). Refined analysis of the WXT data shows that the event started at T0=2025-06-12T12:27:38 (UTC) and lasted for about 35s before the interruption by the autonomous follow-up observation. The peak flux (0.5-4 keV) is estimated to be 3.9 x 10^-8 erg/s/cm^2. The averaged 0.5-4 keV spectrum can be fitted with an absorbed power-law with a Galactic hydrogen column density of 4.3 x 10^21 cm^-2(-2.1, +2.4) and a photon index of 1.01 (-0.1, +0.1). The derived average unabsorbed 0.5-4 keV flux is 3.67 (-0.74, +1.10) x 10^-9 erg/s/cm^2. The Follow-up X-ray Telescope (FXT) on board EP observed this source autonomously at 2025-06-12 12:30:08, about 3 minutes after T0, with an exposure time of 5858 seconds. Within the WXT error circle, on-ground analysis of the FXT data found an uncatalogued source at R.A. = 229.6534, DEC = -26.7673 (J2000) with an uncertainty of 10 arcsec (radius, 90% C.L. statistical and systematic), which is spatially consistent with the candidate X-ray counterpart detected by Fermi(Fermi GBM team., GCN 40702). The averaged 0.5-10 keV FXT spectrum can be fitted with an absorbed power-law with a Galactic hydrogen column density of 1.49 x 10^21 cm^-2 and a photon index of 2.2 (-0.045, +0.045). The derived unabsorbed 0.5-10 keV flux is 1.37 (-0.03, +0.04) x 10^-11 erg/s/cm^2. The uncertainties are at the 90% confidence level for all the above parameters. EP-FXT will continue monitoring the source in the forthcoming days. Multi-band follow-up observations are encouraged. The contact TA of EP250612a is Y.L.Hua, please contact him via the email ylhua(a)pmo.ac.cn if needed. 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/40720. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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