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

[vsnet-grb-info 38657] GRB 250601A: Fermi GBM Observation
by GCN Circulars 03 Jun '25

03 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40621 SUBJECT: GRB 250601A: Fermi GBM Observation DATE: 25/06/03 15:42:16 GMT FROM: Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma(a)nasa.gov> V. Sharma (NASA-GSFC/UMBC) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 17:29:35 UT on 1 Jun 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250601A (trigger 770491780 / 250601729). which was also detected by Swift/BAT-GUANO (J. DeLaunay et al. 2025, GCN 40600) and Swift/XRT (K.L. Page et al. 2025, GCN 40604). The Fermi GBM on-ground location is consistent with the Swift/BAT-GUANO position. The angle from the Fermi LAT boresight is 24 degrees. The GBM light curve consists of main emission episode with a duration (T90) of about 3 s (50-300 keV). The time-averaged spectrum from T0-0.5 to T0+2.4 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.58 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 873 +/- 142 keV. The event fluence (10-1000 keV) in this time interval is (2.7 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1 s in the 10-1000 keV band is 4.9 +/- 0.2 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/40621. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38656] GRB 250602A: DDOTI Optical Follow-Up of the Fermi/LAT Localization
by GCN Circulars 03 Jun '25

03 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40620 SUBJECT: GRB 250602A: DDOTI Optical Follow-Up of the Fermi/LAT Localization DATE: 25/06/03 15:06:50 GMT FROM: Rosa L. Becerra at Tor Vergata, Roma <rosa.becerra(a)roma2.infn.it> Rosa L. Becerra (U Roma), Sahil Atri (U Roma), Alan M. Watson (UNAM), Camila Angulo Valdez (UNAM), Nat Butler (ASU), Simone Dichiara (Penn State University), Tsvetelina Dimitrova (ASU), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Océlotl López (UNAM), Margarita Pereyra (UNAM) and Eleonora Troja (U Roma) report: We continued our follow-up campaign of GRB 250602A, detected by Fermi/GBM (Fermi GBM Team, GCN Circ. 40602) with the DDOTI/OAN wide-field imager at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir (http://ddoti.astroscu.unam.mx) on the night of 2025-06-03 UTC. DDOTI observed the Fermi/LAT error region (Holzmann Airasca et al., GCN Circ. 40611), from 03:51 UTC to 05:01 UTC (from T+24.7 h to T+ 25.9 h after the trigger), obtaining a total exposure time of 48 minutes. By comparing our observations with the USNO-B1 and Pan-STARRS PS1 DR2 catalogs, and performing image subtraction using a Pan-STARRS PS1 DR2 template, we detect no uncatalogued sources within the observed field down to a 10-sigma limiting AB magnitude of: w > 20.0 Unfortunately, the Fermi/LAT error region was not included in the field observed on the night of 2025-06-02 UTC (Atri et al., GCN Circ. 40610). This value is not corrected for the Galactic extinction. We thank the staff of the Observatorio Astronómico Nacional on the Sierra of San Pedro Mártir. View this GCN Circular online at https://gcn.nasa.gov/circulars/40620. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38655] GRB 250603A: Swift/UVOT Upper Limits
by GCN Circulars 03 Jun '25

03 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40619 SUBJECT: GRB 250603A: Swift/UVOT Upper Limits DATE: 25/06/03 13:14:52 GMT FROM: Samantha Oates at University of Birmingham <samantha.oates(a)alumni.ucl.ac.uk> S. R. Oates (Lancaster U.) and T. M. Parsotan (GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 250603A 105 s after the BAT trigger (Parsotan et al., GCN Circ. 40613). No optical afterglow consistent with the enhanced XRT position (Beardmore et al., GCN Circ. 40616) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 105 255 147 >20.4 u_FC 318 567 246 >19.7 white 105 1531 382 >21.0 v 647 5129 190 >19.0 b 573 1516 97 >19.6 u 318 1491 324 >19.8 w1 697 1467 78 >18.7 m2 672 1442 97 >18.5 w2 623 5029 294 >19.2 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 1.89 in the direction of the burst (Schlegel et al. 1998). View this GCN Circular online at https://gcn.nasa.gov/circulars/40619. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38654] GRB 250603A: Swift-XRT refined Analysis
by GCN Circulars 03 Jun '25

03 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40618 SUBJECT: GRB 250603A: Swift-XRT refined Analysis DATE: 25/06/03 12:58:34 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> S. Campana (INAF-OAB), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB), D.N. Burrows (PSU), M.A. Williams (PSU), S. Dichiara (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and P.A. Evans report on behalf of the Swift-XRT team: We have analysed 7.3 ks of XRT data for GRB 250603A, from 92 s to 34.7 ks after the trigger. The data comprise 3 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The light curve can be modelled with a power-law decay with a decay index of alpha=1.17 (+0.09, -0.08). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.48 (+0.32, -0.30). The best-fitting absorption column is 1.6 (+0.5, -0.4) x 10^22 cm^-2, in excess of the Galactic value of 6.9 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 7.6 x 10^-11 (1.1 x 10^-10) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.6 (+0.5, -0.4) x 10^22 cm^-2 Galactic foreground: 6.9 x 10^21 cm^-2 Excess significance: 3.3 sigma Photon index: 1.48 (+0.32, -0.30) If the light curve continues to decay with a power-law decay index of 1.17, the count rate at T+24 hours will be 8.8 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.7 x 10^-14 (9.8 x 10^-14) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01320335. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/40618. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38653] Fermi trigger No 770638414: Global MASTER-Net observations report
by GCN Circulars 03 Jun '25

03 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40617 SUBJECT: Fermi trigger No 770638414: Global MASTER-Net observations report DATE: 25/06/03 11:32:32 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 (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB250603.43 (trigger No 770638414,19h 14m 55.20s , +26d 21m 36.0s, R=7.82) errorbox 165 sec after notice time and 195 sec after trigger time at 2025-06-03 10:16:44 UT, with upper limit up to 16.8 mag. Observations started at twilight. The observations began at zenith distance = 73 deg. The sun altitude is -14.5 deg. The galactic latitude b = 7 deg., longitude l = 59 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2890867 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 215 | 2025-06-03 10:16:44 | MASTER-OAFA | (19h 39m 27.79s , +30d 15m 05.9s) | C | 40 | 16.8 | 266 | 2025-06-03 10:17:31 | MASTER-OAFA | (19h 39m 27.74s , +30d 15m 07.5s) | C | 50 | 16.8 | 327 | 2025-06-03 10:18:27 | MASTER-OAFA | (19h 39m 27.67s , +30d 15m 08.4s) | C | 60 | 16.8 | 399 | 2025-06-03 10:19:33 | MASTER-OAFA | (19h 39m 27.58s , +30d 15m 09.3s) | C | 70 | 16.8 | 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/40617. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38652] GRB 250603A: Enhanced Swift-XRT position
by GCN Circulars 03 Jun '25

03 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40616 SUBJECT: GRB 250603A: Enhanced Swift-XRT position DATE: 25/06/03 06:07:13 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team. Using 1415 s of XRT Photon Counting mode data and 1 UVOT images for GRB 250603A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 129.93745, -39.29287 which is equivalent to: RA (J2000): 08h 39m 44.99s Dec (J2000): -39d 17' 34.3" with an uncertainty of 2.3 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/40616. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38651] GRB 250603A: Swift-XRT position and confirmation of GRB nature
by GCN Circulars 03 Jun '25

03 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40615 SUBJECT: GRB 250603A: Swift-XRT position and confirmation of GRB nature DATE: 25/06/03 05:40:03 GMT FROM: K.L. Page at U Leicester <klp5(a)leicester.ac.uk> K.L. Page and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: The XRT began observing the field of GRB 250603A (GCN Circ. 40613) at 01:12:04.7 UT, 101.7 seconds after the BAT trigger. Using promptly-collected data (although downlinked after a delay), we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 129.93750, -39.29289 which is equivalent to: RA(J2000) = 08h 39m 45.00s Dec(J2000) = -39d 17' 34.4" with an uncertainty of 1.9 arcseconds (radius, 90% containment). This location is 104 arcseconds from the BAT onboard position, within the BAT error circle. Given the nature of the fading X-ray light-curve, we confirm this trigger as GRB 250603A, and not a new Galactic transient. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/40615. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38650] Swift GRB250603.05: Global MASTER-Net observations report
by GCN Circulars 03 Jun '25

03 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40614 SUBJECT: Swift GRB250603.05: Global MASTER-Net observations report DATE: 25/06/03 02:48:43 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 (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the Swift GRB250603.05 (trigger No 1320335,08h 39m 40.32s , -39d 16m 04.8s, R=0.05) errorbox 19 sec after notice time and 41 sec after trigger time at 2025-06-03 01:11:04 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 57 deg. The sun altitude is -44.5 deg. The galactic latitude b = 2 deg., longitude l = 260 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2890204 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 46 | MASTER-OAFA | C | 10 | 17.9 | 62 | MASTER-OAFA | C | 10 | 17.9 | 78 | MASTER-OAFA | C | 10 | 17.9 | 99 | MASTER-OAFA | C | 20 | 18.3 | 126 | MASTER-OAFA | C | 20 | 18.3 | 157 | MASTER-OAFA | C | 30 | 18.5 | 198 | MASTER-OAFA | C | 40 | 18.7 | 245 | MASTER-OAFA | C | 40 | 18.6 | 296 | MASTER-OAFA | C | 50 | 18.7 | 362 | MASTER-OAFA | C | 70 | 19.0 | 443 | MASTER-OAFA | C | 80 | 19.0 | 539 | MASTER-OAFA | C | 100 | 19.1 | 656 | MASTER-OAFA | C | 120 | 19.1 | 794 | MASTER-OAFA | C | 140 | 19.2 | 955 | MASTER-OAFA | C | 170 | 19.2 | 1138 | MASTER-OAFA | C | 180 | 19.2 | 1324 | MASTER-OAFA | C | 180 | 19.1 | 1511 | MASTER-OAFA | C | 180 | 19.1 | 1697 | MASTER-OAFA | C | 180 | 19.1 | 1884 | MASTER-OAFA | C | 180 | 19.1 | 2070 | MASTER-OAFA | C | 180 | 19.1 | 2257 | MASTER-OAFA | C | 180 | 19.1 | 2443 | MASTER-OAFA | C | 180 | 19.1 | 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/40614. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38649] GRB 250603A: Swift detection of a burst or new Galactic transient Swift J0839.7-3916
by GCN Circulars 03 Jun '25

03 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40613 SUBJECT: GRB 250603A: Swift detection of a burst or new Galactic transient Swift J0839.7-3916 DATE: 25/06/03 01:51:05 GMT FROM: David Palmer at LANL <palmer(a)lanl.gov> T. M. Parsotan (GSFC), R. Brivio (INAF-OAB), R. Gupta (NASA GSFC), M. J. Moss (GSFC), D. M. Palmer (LANL) and C. Salvaggio (INAF-OAB) report on behalf of the Neil Gehrels Swift Observatory Team: At 01:10:23 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 250603A (trigger=1320335). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 129.918, -39.268 which is RA(J2000) = 08h 39m 40s Dec(J2000) = -39d 16' 05" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 18 sec with a possible short spike at T0+16 sec. The peak count rate was ~1,300 counts/sec (15-350 keV), at ~1 sec after the trigger. The XRT began observing the field at 01:12:04.7 UT, 101.7 seconds after the BAT trigger. No source was detected in the 2.5-s promptly available image. We are waiting for the full dataset to detect and localise the XRT counterpart. Although the initial 2.5s of XRT data do not show a clear X-ray afterglow, the high significance of the BAT image (7.82 sigma) gives us confidence that this is an astrophysical source. Further analysis awaits the full downlinked dataset. We note the presence of Fermi-GBM event at ~T+10 minutes (GBM trigger: 770606412) with a position consistent (to its 25Â° error radius) with this source location. Given the location of the BAT detection at 1.42Â° from the Galactic plane, persistent flux over 10 minutes would suggest a Galactic transient. If so, we would name it Swift J0839.7-3916 . Burst Advocate for this burst is T. M. Parsotan (tyler.parsotan AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/) View this GCN Circular online at https://gcn.nasa.gov/circulars/40613. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38648] GRB 250602A: Fermi GBM Observation
by GCN Circulars 03 Jun '25

03 Jun '25

TITLE: GCN CIRCULAR NUMBER: 40612 SUBJECT: GRB 250602A: Fermi GBM Observation DATE: 25/06/03 01:47:35 GMT FROM: Jacob Smith at Fermi-GBM Team <jrs0118(a)uah.edu> Jacob Smith (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: At 03:04:31.31 UT on 02 June 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250602A (trigger 770526276/250602128). which was also detected by Fermi-LAT (A. Holzmann Airasca, et al. 2025, GCN 40611). The Fermi GBM on-ground location is consistent with the Fermi-LAT position. The angle from the Fermi LAT boresight is 111 degrees. The GBM light curve consists of a single emission episode with a duration (T90) of about 14.6 s (50-300 keV). The time-averaged spectrum from T0+0.003 to T0+8.768 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.9 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 120 +/- 10 keV. The event fluence (10-1000 keV) in this time interval is (1.7 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.0 s in the 10-1000 keV band is 5.8 +/- 0.3 ph/s/cm^2. A Band function fits the spectrum equally well with Epeak= 102 +/- 22 keV, alpha = -0.7 +/- 0.3 and beta = -2.2 +/- 0.2. 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/40612. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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