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

[vsnet-grb-info 34839] Fermi trigger No 743953682: Global MASTER-Net observations report
by GCN Circulars 29 Jul '24

29 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36975 SUBJECT: Fermi trigger No 743953682: Global MASTER-Net observations report DATE: 24/07/29 19:15:34 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-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB240729.57 (trigger No 743953682,19h 23m 02.40s , +44d 43m 12.0s, R=2.24) errorbox 16856 sec after notice time and 16877 sec after trigger time at 2024-07-29 18:29:15 UT, with upper limit up to 18.5 mag. Observations started at twilight. The observations began at zenith distance = 22 deg. The sun altitude is -12.5 deg. The galactic latitude b = 13 deg., longitude l = 77 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2544789 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 16908 | 2024-07-29 18:29:15 | MASTER-Tavrida | (19h 21m 40.27s , +45d 15m 50.1s) | C | 60 | 16.8 | 16981 | 2024-07-29 18:30:28 | MASTER-Tavrida | (19h 24m 54.96s , +43d 56m 46.3s) | C | 60 | 17.5 | 17055 | 2024-07-29 18:31:42 | MASTER-Tavrida | (19h 10m 25.87s , +43d 56m 43.4s) | C | 60 | 18.5 | 17129 | 2024-07-29 18:32:56 | MASTER-Tavrida | (19h 18m 47.48s , +46d 33m 20.8s) | C | 60 | 18.4 | 17203 | 2024-07-29 18:34:10 | MASTER-Tavrida | (19h 06m 55.85s , +45d 15m 17.9s) | C | 60 | 18.3 | 17277 | 2024-07-29 18:35:24 | MASTER-Tavrida | (19h 14m 27.88s , +42d 38m 28.0s) | C | 60 | 17.1 | 17351 | 2024-07-29 18:36:38 | MASTER-Tavrida | (19h 28m 32.33s , +42d 38m 31.2s) | C | 60 | 17.6 | 17425 | 2024-07-29 18:37:52 | MASTER-Tavrida | (19h 16m 30.77s , +47d 50m 56.2s) | C | 60 | 17.4 | 17499 | 2024-07-29 18:39:06 | MASTER-Tavrida | (19h 03m 49.04s , +46d 32m 53.7s) | C | 60 | 18.3 | 17574 | 2024-07-29 18:40:21 | MASTER-Tavrida | (19h 36m 24.62s , +45d 14m 20.4s) | C | 60 | 17.4 | 17647 | 2024-07-29 18:41:34 | MASTER-Tavrida | (19h 33m 56.79s , +46d 32m 00.4s) | C | 60 | 17.4 | 17722 | 2024-07-29 18:42:49 | MASTER-Tavrida | (19h 18m 47.26s , +41d 21m 12.9s) | C | 60 | 17.1 | 17796 | 2024-07-29 18:44:03 | MASTER-Tavrida | (19h 39m 20.17s , +43d 57m 04.4s) | C | 60 | 17.5 | 17872 | 2024-07-29 18:45:19 | MASTER-Tavrida | (19h 21m 34.19s , +45d 13m 47.2s) | C | 60 | 16.9 | 17946 | 2024-07-29 18:46:33 | MASTER-Tavrida | (19h 33m 01.26s , +45d 14m 04.2s) | C | 60 | 17.8 | 18018 | 2024-07-29 18:47:45 | MASTER-Tavrida | (19h 24m 50.81s , +43d 57m 48.1s) | C | 60 | 16.5 | 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/36975. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34838] GRB 240727A: Swift-BAT refined analysis
by GCN Circulars 29 Jul '24

29 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36974 SUBJECT: GRB 240727A: Swift-BAT refined analysis DATE: 24/07/29 19:11:10 GMT FROM: Rahul Gupta at NASA GSFC <rahul.gupta(a)nasa.gov> R. Gupta (GSFC), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. J. Moss (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU)(i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 240727A (trigger #1245074) (Parsotan, et al., GCN Circ. 36938). The BAT ground-calculated position is RA, Dec = 236.451, 8.612 deg which is RA(J2000) = 15h 45m 48.2s Dec(J2000) = +08d 36' 41.8" with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted BAT light curve shows a complex structure with a duration of ~ 215 sec. T90 (15-350 keV) is 177.88 +- 35.46 sec (estimated error including systematics). The time-averaged spectrum from T-6.79 to T+201.06 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.62 +- 0.18. The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+3.12 sec in the 15-150 keV band is 0.4 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at https://swift.gsfc.nasa.gov/results/BATbursts/hand/1245074/bascript/top.html View this GCN Circular online at https://gcn.nasa.gov/circulars/36974. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34837] Fermi Gamma-ray Burst Monitor trigger 743953682/240729575 is not a GRB:
by GCN Circulars 29 Jul '24

29 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36973 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 743953682/240729575 is not a GRB: DATE: 24/07/29 18:07:55 GMT FROM: Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma(a)nasa.gov> V Sharma (NASA GSFC/UMBC) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 743953682/240729575 at 13:47:57.48 UT on 29 July 2024, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to SAA exit." View this GCN Circular online at https://gcn.nasa.gov/circulars/36973. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34836] LIGO/Virgo/KAGRA S240615dg: GRAWITA wide-field optical observations
by GCN Circulars 29 Jul '24

29 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36972 SUBJECT: LIGO/Virgo/KAGRA S240615dg: GRAWITA wide-field optical observations DATE: 24/07/29 13:21:14 GMT FROM: Paolo D'Avanzo at INAF-OAB <pda.davanzo(a)gmail.com> A. Reguitti (INAF-OAB / INAF-OAPd), L. Tartaglia (INAF-OAAb), L. Tomasella (INAF-OAPd), E. Cappellaro (INAF-OAPd), F. Onori (INAF-OAAb), F. De Luise (INAF-OAAb), E. Bigongiari (Univ. Pisa), R. Brivio (INAF-OAB), M. Ferro (INAF-OAB), Y.-D Hu (INAF-OAB), B. Patricelli (Univ. Pisa), P. D'Avanzo (INAF-OAB), E. Brocato (INAF-OAAb) report on behalf of the GRAWITA collaboration: We carried out optical follow-up observations of the well-localised LIGO/Virgo/KAGRA GW trigger S240615dg (LVK Collaboration, GCN Circ. 36669) with the Schmidt telescopes sited at the INAF Campo Imperatore and Asiago observatories (Italy). Observations from Campo Imperatore started on 2024-06-15 at 23:30 UT (~12 hours after the GW trigger) with the Sloan-r filter. We covered 3 square degrees within the 90% localisation region of the S240615dg GW event with 3 pointings of 1 square degree each, centred at J2000 celestial coordinates: (6.886, 45.598); (8.112, 45.597) and (8.117, 46.445). These observations covered ~ 60% of the final 90% credible region (LVK Collaboration, GCN Circ. #36704). The 3sigma limiting AB magnitude is r ~ 19 mag. Observations from Asiago started on 2024-06-17 at 00:00 UT (~ 1.52 days after the GW trigger) with the Sloan-r filter. A second epoch has been carried out starting on 2024-06-18 at 00:10 UT (~ 2.53 days after the GW trigger), also with the Sloan-r filter. We covered 4 square degrees within the 90% localisation region of the S240615dg GW event with 3 pointings of 1 square degree each, centred at J2000 celestial coordinates: (6.892, 45.564); (6.875, 46.418); (8.116, 46.419) and (8.123, 45.556). These observations covered ~ 80% of the final 90% credible region (LVK Collaboration, GCN Circ. #36704). The typical 3sigma limiting AB magnitudes are r ~ 21.5 mag and r ~ 21.6 mag for the first and second epoch, respectively. Preliminary analysis, which includes image subtraction with the template images from the PanSTARRS all-sky survey does not show evidence for promising candidate counterparts. We note that within the localisation region of the Swift/XRT source N.32 from GCN Circ. #36698 (Page et al. 2024), we detect a source (WISEA J002455.22+452006.9) with variability at a 2.5sigma level. However, the source is reported in the GAIA EDR3 catalog with a parallax of 2.8+-0.17 mas and a proper motion of 21 mas/yr which, together with a red r-z colour of 1.9 mag from the PS1 catalog, is consistent with a late-type dwarf Galactic star experiencing a high-energy flare. View this GCN Circular online at https://gcn.nasa.gov/circulars/36972. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34835] GRB 240727A: observations of optical counterpart.
by GCN Circulars 29 Jul '24

29 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36971 SUBJECT: GRB 240727A: observations of optical counterpart. DATE: 24/07/29 12:25:36 GMT FROM: divulgazione(a)marsec.org Stefano Lora (MarSEC, Marana Space Explorer Center, Marana Di Crespadoro, VI, Italy) Member of: UAI/SSV - Unione Astrofili Italiani/Sezione Stelle Variabili, GRB section. AAVSO (American Association Variable Stars Observers) In collaboration with: Ivo Peretto and Giovanni Furlato (MarSEC, Marana Space Explorer Center, Marana di Crespadoro, VI, Italy) Members of: UAI/SSV - Unione Astrofili Italiani/Sezione Stelle Variabili, GRB section. AAVSO (American Association Variable Stars Observers) report: We imaged the field of GRB 240727A detected by SWIFT(trigger=1245074) with the telescope 14” RC Officina Stellare of MarSEC (Marana Space Explorer Center). The observations with a series of 120 sec exposures started at 2024-07-27 19:40 UT, 952 min. after the GRB trigger, with a Ritchey-Chretien telescope D=360 mm f/ 8. at the following position: RA(J2000) = 15h 45m 44,98s Dec(J2000) = +08d 37' 12,0", Weather conditions were very good without Moon. We co-added 73 exposures of 120 sec each. Start T0+ End T0+ R lim. 952 min 1098 min 17,5 We did not found any optical counterpart in A.R. 15 45 44.98, DEC. +08 37 12.0 position and in the error box of the Swuift candidate. ref.: GCN Circular 36938 Magnitudes were estimated with the APASS and are not corrected for galactic dust extinction. Reference: https://www.marsec.org/ View this GCN Circular online at https://gcn.nasa.gov/circulars/36971. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34834] GRB 240727B: Swift-XRT observations
by GCN Circulars 29 Jul '24

29 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36970 SUBJECT: GRB 240727B: Swift-XRT observations DATE: 24/07/29 08:50:31 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> D.N. Burrows (PSU), J. D. Gropp (PSU), S. Dichiara (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), B. Sbarufatti (INAF-OAB), C. Salvaggio (INAF-OAB), M. Ferro (INAF-OAB) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Fermi/GBM, Swift/BAT-GUANO and Astrosat/CZTI detected burst GRB 240727B (Fletcher et al. 2024, GCN 36949; Ronchini et al. 2024, GCN 36945; Waratkar et al. 2024, GCN 36943), collecting 4.9 ks of Photon Counting (PC) mode data between T0+33.5 ks and T0+52.2 ks. No X-ray sources have been detected within 296 arcsec of the Swift/BAT-GUANO position. The 3-sigma upper limit in the field is 0.003 ct s^-1, corresponding to a 0.3-10 keV observed flux of 1.0e-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum). Three uncatalogued sources were detected too far from the GRB position to be likely afterglow candidates. 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/ToO_GRBs/00021701. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/36970. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34833] Fermi GRB 240727A: Global MASTER-Net observations report
by GCN Circulars 29 Jul '24

29 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36969 SUBJECT: Fermi GRB 240727A: Global MASTER-Net observations report DATE: 24/07/29 03:15:38 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 GRB 240727A ( Fermi GBM team, GCN 36958) errorbox 1 days 9913 sec after notice time and 1 days 9945 sec after trigger time at 2024-07-29 02:37:31 UT, with upper limit up to 16.9 mag. The observations began at zenith distance = 79 deg. The sun altitude is -36.5 deg. The galactic latitude b = -5 deg., longitude l = 248 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2543175 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 96376 | 2024-07-29 02:37:31 | MASTER-SAAO | (07h 08m 02.69s , -36d 44m 01.5s) | C | 60 | 16.4 | 96534 | 2024-07-29 02:40:10 | MASTER-SAAO | (07h 07m 41.05s , -34d 48m 14.6s) | C | 60 | 16.9 | 97030 | 2024-07-29 02:48:26 | MASTER-SAAO | (07h 06m 42.54s , -32d 56m 19.5s) | C | 60 | 16.2 | 97110 | 2024-07-29 02:49:45 | MASTER-SAAO | (07h 16m 18.00s , -32d 54m 03.9s) | C | 60 | 15.9 | 97190 | 2024-07-29 02:51:05 | MASTER-SAAO | (07h 16m 22.47s , -34d 47m 53.9s) | C | 60 | 15.8 | 97269 | 2024-07-29 02:52:25 | MASTER-SAAO | (07h 08m 03.99s , -36d 44m 12.2s) | C | 60 | 16.1 | 97349 | 2024-07-29 02:53:44 | MASTER-SAAO | (07h 19m 20.58s , -38d 35m 56.4s) | C | 60 | 15.9 | 97428 | 2024-07-29 02:55:03 | MASTER-SAAO | (07h 29m 35.38s , -38d 36m 57.4s) | C | 60 | 15.7 | 97507 | 2024-07-29 02:56:23 | MASTER-SAAO | (07h 18m 08.43s , -36d 41m 46.8s) | C | 60 | 15.9 | 97666 | 2024-07-29 02:59:01 | MASTER-SAAO | (07h 07m 36.44s , -34d 48m 22.6s) | C | 60 | 15.7 | 97745 | 2024-07-29 03:00:20 | MASTER-SAAO | (07h 27m 02.23s , -36d 43m 25.0s) | C | 60 | 15.0 | 97826 | 2024-07-29 03:01:42 | MASTER-SAAO | (07h 37m 08.56s , -36d 42m 39.8s) | C | 60 | 14.6 | 98064 | 2024-07-29 03:05:40 | MASTER-SAAO | (07h 06m 44.88s , -32d 55m 02.4s) | C | 60 | 15.5 | 98143 | 2024-07-29 03:06:59 | MASTER-SAAO | (07h 16m 11.65s , -32d 55m 09.9s) | C | 60 | 15.2 | 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/36969. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34832] GRB 240727A: Swift/UVOT detection
by GCN Circulars 28 Jul '24

28 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36968 SUBJECT: GRB 240727A: Swift/UVOT detection DATE: 24/07/28 20:09:28 GMT FROM: Paul Kuin at MSSL <npkuin(a)gmail.com> N. P. M. Kuin (UCL-MSSL) and T.M. Partosan (NASA/GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 240727A 126 s after the BAT trigger (Partosan et al., GCN Circ. 36938). An optical afterglow consistent with the XRT position in GCN Circ 36956 (Gropp et al.) is detected in the initial UVOT exposures. The initial UVOT position found is RA=236.4375000 Dec=8.6202807 RA(J2000) = 15h 45m 45.0s Dec(J2000) = 08d 37' 12.9" with uncertainty = +/- 0.5" (90% confidence) 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 126 276 147 18.29 +/- 0.06 u_FC 285 535 246 17.92 +/- 0.08 b 541 561 20 >19.0 white 565 585 20 18.60 +/- 0.17 b 714 734 20 18.9 +/- 0.3 u 689 709 20 18.5 +/- 0.4 v 615 635 20 >18.0 w1 664 684 20 >17.8 m2 4622 4823 197 >18.7 w2 590 610 20 >17.7 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.037 in the direction of the burst (Schlegel et al. 1998). View this GCN Circular online at https://gcn.nasa.gov/circulars/36968. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34831] Fermi trigger No 743868421: Global MASTER-Net observations report
by GCN Circulars 28 Jul '24

28 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36967 SUBJECT: Fermi trigger No 743868421: Global MASTER-Net observations report DATE: 24/07/28 18:30:35 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 GRB240728.59 (trigger No 743868421,08h 25m 19.20s , -64d 16m 48.0s, R=1.6) errorbox 13545 sec after notice time and 13567 sec after trigger time at 2024-07-28 17:53:03 UT, with upper limit up to 12.5 mag. The observations began at zenith distance = 70 deg. The sun altitude is -23.9 deg. The galactic latitude b = -15 deg., longitude l = 279 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2543809 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 13597 | 2024-07-28 17:53:03 | MASTER-SAAO | (08h 04m 32.69s , -65d 15m 53.6s) | C | 60 | 12.5 | 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/36967. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34830] Fermi Gamma-ray Burst Monitor trigger 743868421/240728588 is not a GRB
by GCN Circulars 28 Jul '24

28 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36966 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 743868421/240728588 is not a GRB DATE: 24/07/28 16:47:57 GMT FROM: Lorenzo Scotton at UAH <lscottongcn(a)outlook.com> L. Scotton (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 743868421/240728588 at 14:06:56.55 UT on 28 July 2024, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to SAA exit." View this GCN Circular online at https://gcn.nasa.gov/circulars/36966. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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