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

[vsnet-grb-info 35440] GRB 240916A: JinShan optical decay in one of the two GOTO candidates
by GCN Circulars 16 Sep '24

16 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37526 SUBJECT: GRB 240916A: JinShan optical decay in one of the two GOTO candidates DATE: 24/09/16 15:14:38 GMT FROM: Dong Xu at NAOC/CAS <dxu(a)nao.cas.cn> S.Q. Jiang, J. An, X. Liu, Z.P. Zhu, S.Y. Fu, D. Xu (NAOC), J.Z. Liu (XAO) report on behalf of a large collaboration: We observed the two GOTO optical counterpart candidates (Gompertz et al., GCN 37522) of GRB 240916A detected by Fermi/GBM (Fermi GBM Team, GCN 37518) and INTEGRAL SPI ACS (Pawar et al., GCN 37519), using the 100cm-C (100C) telescope of the JinShan project, located in Altay, Xinjiang, China. Observations started at 2024-09-16T13:38:03.01 UT, i.e., 12.25 hr after the Fermi/GBM trigger, and a series of Sloan r-band frames were obtained. GOTO24fzk, also as AT 2024vlo, has r = 19.11 +/- 0.05 (AB) in our stacked image, via image subtraction and calibrated with Legacy Survey DR10. There is no apparent fading for this source, compared with L = 19.15 +/- 0.19 at the GOTO observational time. We thus think it's likely unrelated to the GRB. GOTO24fzn, also as AT 2024vlp, has r = 18.69 +/- 0.05 (AB) in our stacked image, calibrated with Legacy Survey DR10. It has considerably faded, compared with L = 17.80 +/- 0.05 at the GOTO observational time. The decay rate is consistent with that for GRB optical afterglows. We thus think GOTO24fzn/AT 2024vlp is likely the optical counterpart of GRB 240916A. We acknowledge the excellent support from X. Yao, S.W. Luo, and Z.K. Feng for enabling these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/37526. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35439] GRB 240916B: Fermi GBM Final Real-time Localization
by GCN Circulars 16 Sep '24

16 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37525 SUBJECT: GRB 240916B: Fermi GBM Final Real-time Localization DATE: 24/09/16 14:47:31 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 SHORT GRB At 14:36:45 UT on 16 Sep 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240916B (trigger 748190210.124874 / 240916609). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 56.5, Dec = 9.0 (J2000 degrees, equivalent to J2000 03h 46m, 9d 00'), with a statistical uncertainty of 17.6 degrees. The angle from the Fermi LAT boresight is 20.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240916609/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240916609/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240916609/… View this GCN Circular online at https://gcn.nasa.gov/circulars/37525. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35438] GRB 240914B: Fermi GBM Final Localization
by GCN Circulars 16 Sep '24

16 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37524 SUBJECT: GRB 240914B: Fermi GBM Final Localization DATE: 24/09/16 14:45:03 GMT FROM: Ava Myers at NASA GSFC <ava.myers(a)nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB "At 07:09:47.31 UT on 14 September 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240914B (trigger 747990592/240914298). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 293.61, Dec = 29.25 (J2000 degrees, equivalent to J2000 19h 34m, +29d 15'), with a statistical uncertainty of 2.36 degrees. The angle from the Fermi LAT boresight is 52 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240914298/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240914298/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240914298/…" View this GCN Circular online at https://gcn.nasa.gov/circulars/37524. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35437] The EP-WXT triggers 01709047257 and 01709047278 are not real sources
by GCN Circulars 16 Sep '24

16 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37523 SUBJECT: The EP-WXT triggers 01709047257 and 01709047278 are not real sources DATE: 24/09/16 13:01:33 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> H. Q. Cheng (NAOC, CAS), Y.-H. I. Yin (NJU), S. F. Zhu (USTC), Q. C. Liu (THU), W. D. Zhang (NAOC, CAS) on behalf of the Einstein Probe (EP) team Further analysis of the late arrived telemetry data verifies that the EP-WXT on-board trigger 01709047257 at 2024-09-15T14:21:24.501 UTC is not a real source. Further analysis of the late arrived telemetry data verifies that the trigger 01709047278 at 2024-09-16T06:35:00.849 UTC is most likely due to particle activity. View this GCN Circular online at https://gcn.nasa.gov/circulars/37523. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35436] The EP-WXT triggers 01709047257 and 01709047278 are not real sources
by GCN Circulars 16 Sep '24

16 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37523 SUBJECT: The EP-WXT triggers 01709047257 and 01709047278 are not real sources DATE: 24/09/16 13:01:33 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> H. Q. Cheng (NAOC, CAS), Y.-H. I. Yin (NJU), S. F. Zhu (USTC), Q. C. Liu (THU), W. D. Zhang (NAOC, CAS) on behalf of the Einstein Probe (EP) team Further analysis of the late arrived telemetry data verifies that the EP-WXT on-board trigger 01709047257 at 2024-09-15T14:21:24.501 UTC is not a real source. Further analysis of the late arrived telemetry data verifies that the trigger 01709047278 at 2024-09-16T06:35:00.849 UTC is most likely due to particle activity. View this GCN Circular online at https://gcn.nasa.gov/circulars/37523. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35435] GRB 240916A: GOTO identification of two new optical sources within the GBM localisation region
by GCN Circulars 16 Sep '24

16 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37522 SUBJECT: GRB 240916A: GOTO identification of two new optical sources within the GBM localisation region DATE: 24/09/16 11:16:13 GMT FROM: Ben Gompertz at U of Birmingham <b.gompertz(a)bham.ac.uk> B. P. Gompertz, A. Kumar, D. O’Neill, M. Kennedy, R. Starling, K. Ackley, M. Dyer, F. Jiménez-Ibarra, J. Lyman, K. Ulaczyk, D. Steeghs, D. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. Breton, L. Nuttall, E. Palle, D. Pollacco and T. Killestein report on behalf of the GOTO collaboration: We report on optical observations with the Gravitational-wave Optical Transient Observer (GOTO; Steeghs et al. 2022) in response to GRB 240916A, detected by Fermi/GBM and INTEGRAL SPI ACS (Fermi GBM Team, GCN 37518; Pawar et al., GCN 37519). Targeted observations were performed by GOTO South between 2024-09-16 09:06:48 UT (t0+7.73h) and 2024-09-16 09:23:05 UT (t0+8.00h). In total, 48 images were taken across 6 unique pointings, covering 178.6 square degrees within the GBM 90% localisation contour. This corresponds to ~78.3% coverage of the total 2D localisation probability. Each observation consisted of 4x90s exposures in the GOTO L-band (400-700 nm). The average 5-sigma limiting magnitude was L > 19.1 mag. Images were processed immediately after acquisition using the GOTO pipeline. Difference imaging was performed using deeper template observations of the same fields. Source candidates were initially filtered using a classifier (Killestein et al. 2021) and cross-matched against a variety of contextual and minor planet catalogs. Human vetting was carried out in real time on any candidates that passed the above checks. We identify 2 new optical sources contained within the GBM 90% probability contour: +-----------------------------------------------------------------------+ | Internal name | IAU name | ra | dec | L-band mag | +-----------------------------------------------------------------------+ | GOTO24fzk | AT 2024vlo<https://www.wis-tns.org/object/2024vlo> | 234.873760 | -6.94630 | 19.15 +/- 0.19 | | GOTO24fzn | AT 2024vlp<https://www.wis-tns.org/object/2024vlp> | 235.913454 | -7.76478 | 17.80 +/- 0.05 | +-----------------------------------------------------------------------+ GOTO24fzk/AT2024vlo is consistent with galaxy 6dF J1539293-065643 in the GLADE+ galaxy catalog (Dálya et al., 2021), with a photometric redshift of z = 0.0267+/-0.0339 (121 Mpc). We find no evidence of these sources prior to the GRB trigger time in previous GOTO observations, the ZTF observations provided by the Lasair broker (Smith et al. 2019), or the ATLAS forced photometry server (Shingles et al. 2021). However, pre-burst imaging to sufficient depth is not available for the week preceding the GRB. We caution that due to the target field setting soon after twilight, only a single epoch of observations could be obtained, and we therefore cannot assess the rate of evolution of either candidate. Manual checks for minor planets revealed no matches consistent with the source properties at either position. Magnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and not corrected for Galactic extinction. GOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC). View this GCN Circular online at https://gcn.nasa.gov/circulars/37522. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35434] EP EP240913a: Global MASTER-Net observations report
by GCN Circulars 16 Sep '24

16 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37521 SUBJECT: EP EP240913a: Global MASTER-Net observations report DATE: 24/09/16 09:18:29 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-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 EP EP240913a ( EP Team et al., GCN 37492) errorbox 3325 sec after notice time and 2 days 75829 sec after trigger time at 2024-09-16 08:43:22 UT, with upper limit up to 18.4 mag. The observations began at zenith distance = 61 deg. The sun altitude is -23.9 deg. The galactic latitude b = -46 deg., longitude l = 129 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2603446 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 248688 | 2024-09-16 08:43:20 | MASTER- | (01h 00m 36.47s , +16d 08m 09.0s) | C | 120 | 19.3 | 248689 | 2024-09-16 08:43:22 | MASTER-OAFA | (01h 10m 06.79s , +16d 36m 57.6s) | C | 120 | 18.4 | 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/37521. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35433] LIGO/Virgo/KAGRA S240915b: Coverage and upper limits from MAXI/GSC observations
by GCN Circulars 16 Sep '24

16 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37520 SUBJECT: LIGO/Virgo/KAGRA S240915b: Coverage and upper limits from MAXI/GSC observations DATE: 24/09/16 06:13:06 GMT FROM: Motoko Serino at Aoyama Gakuin U. <serino(a)phys.aoyama.ac.jp> H. Nishikawa, S. Sugita, M. Serino, Y. Kawakubo, H. Hiramatsu, 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 S240915b at 2024-09-15 00:13:57.715 UTC (GCN 37512, 37513). At the trigger time of S240915b, the high-voltage of MAXI/GSC was off, and it was turned on at T0+707 sec (+11.8 min). The first one-orbit (92 min) scan observation with GSC after the event covered 100% of the 90% credible region of the Bilby skymap from 01:17:12 to 01:19:17 UTC (T0+3795 to T0+3920 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/37520. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35432] GRB 240916A INTEGRAL SPI ACS LIGHT CURVE
by GCN Circulars 16 Sep '24

16 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37519 SUBJECT: GRB 240916A INTEGRAL SPI ACS LIGHT CURVE DATE: 24/09/16 05:27:32 GMT FROM: Devraj Pawar at R. J. College, Mumbai - 86, India <devrajdp(a)gmail.com> Devraj Pawar (R. J. College, Mumbai-86, India) on behalf of a collaboration studying transients. The Fermi GBM team has reported a GRB in GCN 37518. We analyzed the INTEGRAL SPI ACS data around the T0 given in GCN 37518 and detected a peak in the count rate which lasts for about 50 s. The SPI ACS is sensitive above 80 keV; the peak of the burst is at ~4300 counts/s and the steady rate preceding the event is around 3800 counts/s. The peak count rate may be affected by the instruments orientation with respect to the direction of the source. The light curve and the profile is given in the link below : [https://docs.google.com/document/d/1ypksdTUoXwB8_Lwr5zhiB-8ivEdobW_oeGTxN8B… This work is based on observations with INTEGRAL, an ESA project with instruments and a science data center funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, Spain), and with the participation of Russia and the USA. The SPI-ACS detector system has been provided by MPE Garching/Germany. View this GCN Circular online at https://gcn.nasa.gov/circulars/37519. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35431] GRB 240916A INTEGRAL SPI ACS LIGHT CURVE
by GCN Circulars 16 Sep '24

16 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37519 SUBJECT: GRB 240916A INTEGRAL SPI ACS LIGHT CURVE DATE: 24/09/16 05:27:32 GMT FROM: Devraj Pawar at R. J. College, Mumbai - 86, India <devrajdp(a)gmail.com> Devraj Pawar (R. J. College, Mumbai-86, India) on behalf of a collaboration studying transients. The Fermi GBM team has reported a GRB in GCN 37518. We analyzed the INTEGRAL SPI ACS data around the T0 given in GCN 37518 and detected a peak in the count rate which lasts for about 50 s. The SPI ACS is sensitive above 80 keV; the peak of the burst is at ~4300 counts/s and the steady rate preceding the event is around 3800 counts/s. The peak count rate may be affected by the instruments orientation with respect to the direction of the source. The light curve and the profile is given in the link below : [https://docs.google.com/document/d/1ypksdTUoXwB8_Lwr5zhiB-8ivEdobW_oeGTxN8B… This work is based on observations with INTEGRAL, an ESA project with instruments and a science data center funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, Spain), and with the participation of Russia and the USA. The SPI-ACS detector system has been provided by MPE Garching/Germany. View this GCN Circular online at https://gcn.nasa.gov/circulars/37519. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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