August 2024 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 35265] GRB 240829B: GRBAlpha detection
by GCN Circulars 31 Aug '24

31 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37366 SUBJECT: GRB 240829B: GRBAlpha detection DATE: 24/08/31 19:39:44 GMT FROM: Marianna Dafčíková at Masaryk University <500025(a)mail.muni.cz> M. Dafcikova, J. Ripa, M. Kolar (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Duriskova, L. Szakszonova, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration. The long-duration GRB 240829B (Fermi/GBM detection: GCN 37342, INTEGRAL/SPI-ACS detection: trigger no. 10879) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; https://ui.adsabs.harvard.edu/abs/2023A%26A...677A..40P/abstract) The detection was confirmed at the peak time 2024-08-29 01:23:45.2 UTC. The T90 duration measured by GRBAlpha is 9.5 s and the overall significance during T90 reaches 13 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240829B_GCN.pdf All GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ GRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. View this GCN Circular online at https://gcn.nasa.gov/circulars/37366. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35264] GRB240828B: REM optical/NIR upper limits
by GCN Circulars 31 Aug '24

31 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37365 SUBJECT: GRB240828B: REM optical/NIR upper limits DATE: 24/08/31 18:52:21 GMT FROM: Riccardo Brivio <riccardo.brivio(a)inaf.it> R. Brivio, M. Ferro, P. D’Avanzo, M.G. Bernardini, S. Campana, S. Covino, D. Fugazza, E. Molinari, Y.-D. Hu (INAF-OAB) report on behalf of the REM team: We observed the field of the soft GRB 240828B detected by SVOM/ECLAIRs (Le Provost et al., GCN 37318) with the REM 60cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, H bands, starting on 2024 August 31 at 06:19:52 UT (i.e. 2.71 days after the SVOM trigger), and lasting for about 1 hour. From preliminary photometry we do not detect any optical/NIR counterpart at the Swift-XRT position (Page et al., GCN 37334) down to the following 3sigma magnitude upper limits: H > 15.7 (Vega; calibrated against the 2MASS catalogue) r > 19.9 (AB; calibrated against the PanSTARRS catalogue) at a mid-time of t - t0 = 2.73 days after the trigger. View this GCN Circular online at https://gcn.nasa.gov/circulars/37365. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35263] Fermi trigger No 746816563: Global MASTER-Net observations report
by GCN Circulars 31 Aug '24

31 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37364 SUBJECT: Fermi trigger No 746816563: Global MASTER-Net observations report DATE: 24/08/31 17:45:27 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich (Blagoveschensk Educational State University) 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 GRB240831.71 (trigger No 746816563,19h 07m 07.92s , +50d 15m 00.0s, R=29.85) errorbox 167 sec after notice time and 188 sec after trigger time at 2024-08-31 17:05:46 UT, with upper limit up to 15.7 mag. Observations started at twilight. The observations began at zenith distance = 77 deg. The sun altitude is -10.1 deg. The galactic latitude b = 18 deg., longitude l = 81 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2583411 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 218 | 2024-08-31 17:05:46 | MASTER-SAAO | (19h 11m 21.46s , +38d 53m 47.1s) | C | 60 | 15.7 | 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/37364. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35262] GRB 240828B: AbAO optical upper limit
by GCN Circulars 31 Aug '24

31 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37363 SUBJECT: GRB 240828B: AbAO optical upper limit DATE: 24/08/31 16:13:21 GMT FROM: Alexei Pozanenko at IKI, Moscow <grb.alex(a)gmail.com> S. Belkin (HSE, IKI), R. Ya. Inasaridze (AbAO), A. Pozanenko (IKI), N. Pankov (HSE, IKI) report on behalf of GRB-IKI-FuN: We observed the field of GRB 240828B (Le Provost, GCN 37318; Page et al., GCN 37334) with the 70-cm AS-32 telescope of Abastumani Observatory (AbAO) in the R-filter, starting on 2024-08-29 at 23:38:46 (UT). We did not detect the optical counterpart in the stacked image within the Swift-XRT error circle (Page et al., GCN 37334; ). Preliminary photometry is as follows: Date UT_start t-T0 Filter Exp. OT err UL(3σ) (mid, days) (s) 2024-08-29 23:38:46 1.46045 R 74×60 n/d n/d 22.0 The magnitudes were calibrated using nearby USNO-B1.0 stars. RA DEC R2 04:13:38.682 +16:40:58.242 17.00 04:13:51.313 +16:42:50.073 16.7 View this GCN Circular online at https://gcn.nasa.gov/circulars/37363. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35261] GRB 240828B: AbAO optical upper limit
by GCN Circulars 31 Aug '24

31 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37363 SUBJECT: GRB 240828B: AbAO optical upper limit DATE: 24/08/31 16:13:21 GMT FROM: Alexei Pozanenko at IKI, Moscow <grb.alex(a)gmail.com> S. Belkin (HSE, IKI), R. Ya. Inasaridze (AbAO), A. Pozanenko (IKI), N. Pankov (HSE, IKI) report on behalf of GRB-IKI-FuN: We observed the field of GRB 240828B (Le Provost, GCN 37318; Page et al., GCN 37334) with the 70-cm AS-32 telescope of Abastumani Observatory (AbAO) in the R-filter, starting on 2024-08-29 at 23:38:46 (UT). We did not detect the optical counterpart in the stacked image within the Swift-XRT error circle (Page et al., GCN 37334; ). Preliminary photometry is as follows: Date UT_start t-T0 Filter Exp. OT err UL(3σ) (mid, days) (s) 2024-08-29 23:38:46 1.46045 R 74×60 n/d n/d 22.0 The magnitudes were calibrated using nearby USNO-B1.0 stars. RA DEC R2 04:13:38.682 +16:40:58.242 17.00 04:13:51.313 +16:42:50.073 16.7 View this GCN Circular online at https://gcn.nasa.gov/circulars/37363. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35260] GRB 240831A: Fermi GBM Final Real-time Localization
by GCN Circulars 31 Aug '24

31 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37362 SUBJECT: GRB 240831A: Fermi GBM Final Real-time Localization DATE: 24/08/31 15:05:55 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 14:54:49 UT on 31 Aug 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240831A (trigger 746808894.48422 / 240831621). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 286.3, Dec = 40.2 (J2000 degrees, equivalent to J2000 19h 05m, 40d 12'), with a statistical uncertainty of 1.1 degrees. The angle from the Fermi LAT boresight is 167.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240831621/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240831621/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240831621/… View this GCN Circular online at https://gcn.nasa.gov/circulars/37362. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35259] GRB 240825A: SOAR observations
by GCN Circulars 31 Aug '24

31 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37361 SUBJECT: GRB 240825A: SOAR observations DATE: 24/08/31 13:26:09 GMT FROM: James Freeburn at Swinburne University of Technology <jamesfreeburn54(a)gmail.com> J. Freeburn (Swinburne/OzGrav) and I. Andreoni (UNC/UMD/NASA) We observed the field of GRB 240825A (The Fermi GBM team, GCN 37273; Gupta et al., GCN 37274; Lalla et al., GCN 37288; Evans et al., 37290; Gropp et al., GCN 37294; Joshi et al., GCN 37298; Sharma et al., GCN 37301; Frederiks et al., GCN 37302; Wang and Xiong, GCN 37315; Moss et al., GCN 37355) with the Goodman High Throughput Spectrograph mounted on the SOAR telescope in imaging mode. We took one 300s exposure each in filters g,r and i between 2024-08-31T04:45:51 and 2024-08-31T05:00:23 UTC. We place upper limits on the optical counterpart to GRB 240825A (Gupta et al., GCN 37274; Jiang et al., GCN 37275; Dutton et al., GCN 37276; Odeh et al., GCN 37277; Zhang et al., GCN 37278; Li et al., GCN 37280; Izzo et al., GCN 37287; Lipunov et al., GCN 37289; Leonini et al., GCN 37291; Wu et al., GCN 37292; Martin-Carrillo et al., GCN 37293; Brivio et al., GCN 37295; Kuin et al., GCN 37296; Odeh et al., GCN 37299; Le Floc'h et al., GCN 37300; Guiffreda et al., GCN 37303; Zheng et al., GCN 37304; Wang et al., GCN 37306; Maksut et al., GCN 37307; Melandri et al., GCN 37310; Romanov, GCN 37335; Moskvitin et al., GCN 37336; Qiu et al., GCN 37338). Zeropoints for each filter were measured using the Pan-STARRS1 catalogue. Our AB magnitude 5-sigma upper limits are as follows: g > 23.2 r > 23.1 i > 22.8 View this GCN Circular online at https://gcn.nasa.gov/circulars/37361. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35258] GRB 240828B: Mephisto optical upper limit
by GCN Circulars 31 Aug '24

31 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37360 SUBJECT: GRB 240828B: Mephisto optical upper limit DATE: 24/08/31 13:25:50 GMT FROM: Brajesh Kumar at SWIFAR, YNU <brajesh(a)ynu.edu.cn> Guowang Du (SWIFAR, YNU), Helong Guo (SWIFAR, YNU), Jinghua Zhang (SWIFAR, YNU), Tao Wang (SWIFAR, YNU), Zhenfei Qin (SWIFAR, YNU), Yicheng Jin (SWIFAR, YNU), Yu Pan (SWIFAR, YNU), Xingzhu Zou (SWIFAR, YNU), Xinlei Chen (SWIFAR, YNU), Yehao Cheng (SWIFAR, YNU), Yuan Fang (SWIFAR, YNU), Brajesh Kumar (SWIFAR, YNU), Xuhui Han (NAOC), Pinpin Zhang (NAOC), Liping Xin (NAOC), Chao Wu (NAOC), Yuanpei Yang (SWIFAR, YNU), Xinzhong Er (SWIFAR, YNU), Xiangkun Liu (SWIFAR, YNU), Xiaowei Liu (SWIFAR, YNU) report on behalf of Mephisto Team: The field of SVOM/ECLAIRs-detected burst GRB 240828B (Le Provost et al., GCN 37318) was observed with 1.6m Multi-channel Photometric Survey Telescope (Mephisto) of Yunnan University located at Lijiang Observatory. Simultaneous multi-band photometric observations were initiated at (UT) 19:25:20 Aug 28, (~6.21 hours after the burst notice). No new optical source was detected within the 2.6-arcsec Swift/XRT error circle (Page et al., GCN 37334). The 5-sigma limiting magnitudes in different bands are: u 20.75 (180 sec), v 20.97 (180 sec), g 20.54 (50 sec), r 20.83 (50 sec), i 20.44 (79 sec) and z 19.35 (79 sec). These are consistent with Zheng et al. (GCN 37345), Moskvitin et al. (GCN 37346), Wu et al. (GCN 37347), Xin et al. (GCN 37348), Wang et al. (GCN 37350), Schneider et al. (GCN 37352) and Akl et al. (GCN 37359). ------------------------------------------------------------------------------------------------------ Mephisto (Multi-channel Photometric Survey Telescope) is a 1.6m wide-field multi-channel telescope, the first of its type in the world, capable of imaging the same field of view in three optical bands simultaneously. It provides real-time, high-quality colors of stellar objects. The on-site telescope assemblage and commissioning were carried out in September 2022. The first light in all three channels was achieved on 2023 December 21. ------------------------------------------------------------------------------------------------------ View this GCN Circular online at https://gcn.nasa.gov/circulars/37360. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35257] GRB 240828B: GRANDMA Optical Upper Limit
by GCN Circulars 31 Aug '24

31 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37359 SUBJECT: GRB 240828B: GRANDMA Optical Upper Limit DATE: 24/08/31 10:49:49 GMT FROM: Dalya Akl at American Uni. SHJ <dalyaakl.d(a)gmail.com> D. Akl (AUS), S. Antier (OCA), M. Coughlin (UMN), P-A Duverne (APC), P. Hello (IJCLAB), C. Andrade (UMN), I. Tosta e Melo (UniCT-DFA), S. Karpov (FZU), D. Turpin (CEA-Saclay/Irfu), N. Guessoum (AUS), T. Pradier (Unistra/IPHC), R. Inasaridze, V. Aivazyan, N. Kochiashvili (AbAO), K. Noysena, M. Tanasan (NARIT), A. Kaeouch (OUCA) on behalf of the GRANDMA collaboration: We performed observations with GRANDMA and its citizen science project Kilonova-catcher (KNC) on the field of GRB 240828B, detected by SVOM/ECLAIRs (GCN 37318), with the TRT-SRO, Abastumani-T70, and KNC-ASO telescopes. The first observations started on 29-08-2024 at 10:24:08 (UTC), 0.88 days after the GRB trigger, and lasted for 0.65 days. The observations covered the B, V, R, and I filters. We did not detect any optical counterpart at the Swift-XRT afterglow position (3 arcsec, centered around RA, Dec = 63.45995, 16.71561). We also searched the SVOM/ECLAIRs localization position (25 arcmin, centered around RA, Dec = 63.36, 16.71) and did not detect any optical counterpart. Our photometry results and upper limits can be found at: https://skyportal-icare.ijclab.in2p3.fr/public/sources/S24082808/ All the data has been reduced by a single data processing pipeline, STDPipe (Karpov et al., 2022). Our results are consistent with Zheng et al. (GCN 37345), Moskvitin et al. (GCN 37346), Wu et al. (GCN 37347), Xin et al. (GCN 37348), Wang et al. (GCN 37350), and Schneider et al. (GCN 37352). We use the SkyPortal application (skyportal.io) to monitor our observational campaign. We thank SVOM for the useful communication. GRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS 49, 5518). Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/) View this GCN Circular online at https://gcn.nasa.gov/circulars/37359. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35256] LIGO/Virgo/KAGRA S240830gn: Coverage and upper limits from MAXI/GSC observations
by GCN Circulars 31 Aug '24

31 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37358 SUBJECT: LIGO/Virgo/KAGRA S240830gn: Coverage and upper limits from MAXI/GSC observations DATE: 24/08/31 04:54:43 GMT FROM: Yuta Kawakubo at Aoyama Gakuin University <kawakubo(a)phys.aoyama.ac.jp> Y. Kawakubo, S. Sugita, M. Serino, H. Hiramatsu, H. Nishikawa, Y. Kondo (AGU), H. Negoro, M. Nakajima, K. Takagi (Nihon U.), N. Kawai, T. Mihara, (RIKEN), report on behalf of the MAXI team: We examined MAXI/GSC all-sky X-ray images (2-20 keV) after compact binary merger candidate S240830gn at 2024-08-30 21:11:20.392 UTC (GCN #37354, #37357). At the trigger time of S240830gn, the high-voltage of MAXI/GSC was off, and it was turned on at T0+374 sec (+6.2 min). The first one-orbit (92 min) scan observation with GSC after the event covered 65% of the 90% credible region of the Bilby skymap from 21:31:02 to 22:21:22 UTC (T0+1182 to T0+4202 sec). No significant new source was found in the region in the one-orbit scan observation. A typical 1-sigma averaged upper limit obtained in one scan observation is 20 mCrab at 2-20 keV. If you require information about X-ray flux by MAXI/GSC at specific coordinates, please contact the submitter of this circular by email. View this GCN Circular online at https://gcn.nasa.gov/circulars/37358. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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