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[vsnet-grb-info 38734] GRB 250610B - SVOM/ECLAIRs refined analysis
by GCN Circulars 12 Jun '25

12 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40695 SUBJECT: GRB 250610B - SVOM/ECLAIRs refined analysis DATE: 25/06/12 07:39:53 GMT FROM: ogodet(a)irap.omp.eu Authors: O. Godet (IRAP), A. Coleiro (APC), M.-G. Bernardini (INAF-OAB, LUPM), A. Saccardi (CEA), J. Rodriguez (CEA) Using the event-by-event data downloaded through the X-band ground station, we report further analysis of ECLAIRs observations of GRB 250610B (SVOM burst-id sb25061018). The burst that triggered ECLAIRs onboard (GCN #40671) … [View More]

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[vsnet-grb-info 38733] GRB 250612A: Swift detection of a burst or new Galactic transient Swift J1643.6-3854
by GCN Circulars 12 Jun '25

12 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40694 SUBJECT: GRB 250612A: Swift detection of a burst or new Galactic transient Swift J1643.6-3854 DATE: 25/06/12 01:27:51 GMT FROM: James DeLaunay at PSU <jjd330(a)psu.edu> M. H. Siegel (PSU), J. J. DeLaunay (PSU), R. Gupta (NASA GSFC) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 01:02:05.82 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 250612A (trigger=1323295). The BAT on-board … [View More]

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[vsnet-grb-info 38732] Swift GRB250612.04: Global MASTER-Net observations report
by GCN Circulars 12 Jun '25

12 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40693 SUBJECT: Swift GRB250612.04: Global MASTER-Net observations report DATE: 25/06/12 01:14:39 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.… [View More]

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[vsnet-grb-info 38731] Fermi GBM Sub-Threshold Detection of GRB 250610B
by GCN Circulars 11 Jun '25

11 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40692 SUBJECT: Fermi GBM Sub-Threshold Detection of GRB 250610B DATE: 25/06/11 19:54:51 GMT FROM: rhamburg(a)usra.edu R. Hamburg (USRA) reports on behalf of the Fermi-GBM Team: The SVOM/ECLAIRs and SVOM/GRM instruments detected GRB 250610B on 2025-06-10T16:32:58 (GCN 40671). There was no Fermi-GBM onboard trigger around this event time. An automated, blind search for gamma-ray bursts below the onboard triggering threshold in Fermi-GBM identified no … [View More]

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[vsnet-grb-info 38730] GRB 250610B: Swift/UVOT Detection
by GCN Circulars 11 Jun '25

11 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40691 SUBJECT: GRB 250610B: Swift/UVOT Detection DATE: 25/06/11 15:39:28 GMT FROM: Alice Breeveld at MSSL-UCL <a.breeveld(a)ucl.ac.uk> A.A. Breeveld (UCL-MSSL) and M.A. Williams (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 250610B 2 ks after the SVOM trigger (Saccardi et al., GCN Circ. 40671). The optical source at the position of XRT source 1 (Evans et al., GCN Circ. 40679) seen by … [View More]

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[vsnet-grb-info 38729] EP250610A: Swift/UVOT Upper limits
by GCN Circulars 11 Jun '25

11 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40690 SUBJECT: EP250610A: Swift/UVOT Upper limits DATE: 25/06/11 14:39:47 GMT FROM: Mike Siegel at PSU/Swift MOC <mhs18(a)psu.edu> M. H. Siegel (PSU) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of EP250610A 3 ks after the EP trigger (Zhang et al., GCN Circ. 40660). No optical afterglow consistent with the XRT position (Evans et al., GCN Circ. 40662) is seen in the initial UVOT exposures. … [View More]

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[vsnet-grb-info 38728] GRB 250610B: SVOM/COLIBRÍ (FM-GFT) optical observations
by GCN Circulars 11 Jun '25

11 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40689 SUBJECT: GRB 250610B: SVOM/COLIBRÍ (FM-GFT) optical observations DATE: 25/06/11 13:50:37 GMT FROM: Benjamin Schneider at MIT <bschn(a)mit.edu> Benjamin Schneider (LAM), Diego López-Cámara (UNAM), Rosa L. Becerra (U Roma), Jean-Grégoire Ducoin (CPPM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Alan M. Watson (UNAM), Fredd Alvarez (UNAM), Jean-Luc Atteia (IRAP), Camila Angulo (UNAM), Dalya Akl (AUS), Sarah Antier (OCA), Nathaniel R. … [View More]Butler (ASU), Damien Dornic (CPPM), Francis Fortin (IRAP), Leonardo García García (UNAM), Noémie Globus (UNAM), Kin Ocelotl López (UNAM), Francesco Magnani (CPPM), Enrique Moreno Méndez (UNAM), Margarita Pereyra (UNAM), Ny Avo Rakotondrainibe (LAM), Antonio de Ugarte Postigo (LAM), A. Saccardi (CEA), and J. Rodriguez (CEA): We imaged the field of the SVOM GRB 250610B (Saccardi et al., GCN Circ. 40671) using the DDRAGO wide-field imager on the SVOM/COLIBRÍ (FM-GFT) telescope. We observed from 2025-06-11 04:35 to 06:40 UTC (from 12.0 to 14.1 hours after the trigger) and obtained 32 minutes of exposure in each of the g, r and i filters. 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. We detected the optical counterpart reported by Schneider et al., GCN Circ. 40676; Gompertz et al., GCN Circ. 40677; Li et al., GCN Circ. 40678; Bochenek et al., GCN Circ. 40684, and Qiu et al., GCN Circ. 40685 at preliminary magnitudes of: g = 21.83 +/- 0.14 r = 21.56 +/- 0.10 i = 21.49 +/- 0.09 Our detections are consistent with the shallow decay reported by the SVOM/VT team (Qiu et al., GCN Circ. 40685) and imply a temporal decay index of ~0.6. Further observations are planned. 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/40689. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 38727] EP250610a: TNG NIR upper limit
by GCN Circulars 11 Jun '25

11 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40688 SUBJECT: EP250610a: TNG NIR upper limit DATE: 25/06/11 11:56:27 GMT FROM: Riccardo Brivio at INAF-OAB <riccardo.brivio(a)inaf.it> R. Brivio, P. D'Avanzo, M. Ferro, S. Campana (INAF-OAB), L. Izzo (INAF - OACn), D. B. Malesani (DAWN/NBI & Radboud Univ.), R. Salvaterra (INAF-IASF Milan), A. Melandri (INAF-OAR), V. Lorenzi (INAF-TNG) report on behalf of the CIBO collaboration: We observed the field of EP250610a detected by EP/WXT (Zhang et al.,… [View More]

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[vsnet-grb-info 38726] GRB 250610B: REM optical/NIR observations
by GCN Circulars 11 Jun '25

11 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40687 SUBJECT: GRB 250610B: REM optical/NIR observations DATE: 25/06/11 11:49:21 GMT FROM: Riccardo Brivio at INAF-OAB <riccardo.brivio(a)inaf.it> R. Brivio, M. Ferro, P. D'Avanzo, S. Covino, D. Fugazza (INAF-OAB) report on behalf of the REM team: We observed the field of GRB 250610B detected by SVOM/ECLAIRs (Saccardi et al., GCN 40671) with the REM 60 cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were … [View More]

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[vsnet-grb-info 38725] EP250610a: Liverpool Telescope optical upper limits
by GCN Circulars 11 Jun '25

11 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40686 SUBJECT: EP250610a: Liverpool Telescope optical upper limits DATE: 25/06/11 10:13:31 GMT FROM: Rob Eyles-Ferris at U of Leicester <raje1(a)leicester.ac.uk> R. A. J. Eyles-Ferris, P. T. O’Brien and R. L. C. Starling (U of Leicester) report: We observed the field of the X-ray transient EP250610a (Zhang et al., GCN 40660; Lian et al., GCN 40669) with the 2m Liverpool Telescope using the IO:O instrument. We obtained 6x150s exposures in each of the … [View More]

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