September 2021 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 28800] GRB 210930A: Swift/UVOT Upper Limits
by GCN Circulars 30 Sep '21

30 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30903 SUBJECT: GRB 210930A: Swift/UVOT Upper Limits DATE: 21/09/30 22:33:53 GMT FROM: Alexander Belles at PSU/Swift <aub1461(a)psu.edu> A. Belles (PSU) and V. D'Elia (SSDC & INAF-OAR) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 210930A 144 s after the BAT trigger (D'Elia et al., GCN Circ. 30897). No optical afterglow consistent with the XRT position (Osborne et al. GCN Circ. 30900) 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 144 293 147 >19.9 u_FC 302 551 246 >19.6 white 144 1722 411 >20.6 v 631 1773 136 >18.7 b 559 1873 134 >19.6 u 302 1848 363 >19.7 w1 681 1824 136 >19.5 m2 655 1450 39 >18.7 w2 607 1747 117 >20.4 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.010 in the direction of the burst (Schlegel et al. 1998).

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[vsnet-grb-info 28799] GRB 210930A: Swift-XRT refined Analysis
by GCN Circulars 30 Sep '21

30 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30902 SUBJECT: GRB 210930A: Swift-XRT refined Analysis DATE: 21/09/30 19:47:41 GMT FROM: Phil Evans at U of Leicester <pae9(a)leicester.ac.uk> A. D'Ai (INAF-IASFPA), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), D.N. Burrows (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB) and V. D'Elia report on behalf of the Swift-XRT team: We have analysed 6.3 ks of XRT data for GRB 210930A (D'Elia et al. GCN Circ. 30897), from 143 s to 52.5 ks after the BAT trigger. The data comprise 63 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 30900). The light curve can be modelled with a power-law decay with a decay index of alpha=0.71 (+0.09, -0.08). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 4.04 (+0.30, -0.27). The best-fitting absorption column is 1.46 (+0.18, -0.16) x 10^22 cm^-2, in excess of the Galactic value of 9.6 x 10^19 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.2 (+0.4, -0.3) and a best-fitting absorption column of 6.1 (+2.4, -2.0) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (7.5 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 6.1 (+2.4, -2.0) x 10^21 cm^-2 Galactic foreground: 9.6 x 10^19 cm^-2 Excess significance: 5.0 sigma Photon index: 2.2 (+0.4, -0.3) If the light curve continues to decay with a power-law decay index of 0.71, the count rate at T+24 hours will be 6.7 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.5 x 10^-13 (5.0 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01075565. This circular is an official product of the Swift-XRT team.

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[vsnet-grb-info 28798] Swift GRB 210930A: Global MASTER-Net observations report
by GCN Circulars 30 Sep '21

30 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30901 SUBJECT: Swift GRB 210930A: Global MASTER-Net observations report DATE: 21/09/30 16:36:24 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (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. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (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) was pointed to the Swift GRB 210930A ( V. D'Elia et al., GCN 30897) errorbox 48786 sec after notice time and 48953 sec after trigger time at 2021-09-30 16:22:45 UT, with upper limit up to 17.2 mag. Observations started at twilight. The observations began at zenith distance = 59 deg. The sun altitude is -11.0 deg. The galactic latitude b = 68 deg., longitude l = 114 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1737711 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 32055 | MASTER- | C | 1 | 14.1 | 32055 | MASTER- | C | 1 | 15.1 | 36978 | MASTER- | C | 180 | 20.0 | 49043 | MASTER-Tavrida | C | 180 | 17.2 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.

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[vsnet-grb-info 28797] GRB 210930A: Enhanced Swift-XRT position
by GCN Circulars 30 Sep '21

30 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30900 SUBJECT: GRB 210930A: Enhanced Swift-XRT position DATE: 21/09/30 09:19:07 GMT FROM: Phil Evans at U of Leicester <pae9(a)leicester.ac.uk> J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team. Using 1714 s of XRT Photon Counting mode data and 2 UVOT images for GRB 210930A, 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 = 197.40188, +48.62856 which is equivalent to: RA (J2000): 13h 09m 36.45s Dec (J2000): +48d 37' 42.8" with an uncertainty of 2.4 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.

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[vsnet-grb-info 28796] Fermi trigger No 654658271: Global MASTER-Net observations report
by GCN Circulars 30 Sep '21

30 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30899 SUBJECT: Fermi trigger No 654658271: Global MASTER-Net observations report DATE: 21/09/30 09:15:27 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (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. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (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) started inspect of the Fermi GRB210930.06 (trigger No 654658271,19h 36m 40.08s , +24d 09m 00.0s, R=32.42) errorbox 491 sec after notice time and 615 sec after trigger time at 2021-09-30 01:41:21 UT, with upper limit up to 17.3 mag. The observations began at zenith distance = 68 deg. The sun altitude is -38.5 deg. The galactic latitude b = 1 deg., longitude l = 60 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1737652 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 646 | 2021-09-30 01:41:21 | MASTER-OAFA | (17h 45m 09.94s , +06d 12m 55.8s) | C | 60 | 16.4 | 731 | 2021-09-30 01:42:47 | MASTER-OAFA | (17h 53m 13.64s , +06d 11m 15.5s) | C | 60 | 17.3 | 970 | 2021-09-30 01:46:45 | MASTER-OAFA | (17h 34m 37.80s , +08d 05m 27.0s) | C | 60 | 15.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.

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[vsnet-grb-info 28795] Fermi GRB 210929B: Global MASTER-Net observations report
by GCN Circulars 30 Sep '21

30 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30898 SUBJECT: Fermi GRB 210929B: Global MASTER-Net observations report DATE: 21/09/30 09:15:21 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (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. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (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) started inspect of the Fermi GRB 210929B ( Fermi GBM team, GCN 30896) errorbox 12960 sec after notice time and 13009 sec after trigger time at 2021-09-29 23:19:12 UT, with upper limit up to 18.1 mag. Observations started at twilight. The observations began at zenith distance = 43 deg. The sun altitude is -10.2 deg. The galactic latitude b = 18 deg., longitude l = 26 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1737410 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 13040 | 2021-09-29 23:19:12 | MASTER-OAFA | (17h 23m 50.65s , +02d 25m 39.2s) | C | 60 | 16.4 | 13122 | 2021-09-29 23:20:34 | MASTER-OAFA | (17h 31m 43.25s , +02d 24m 27.5s) | C | 60 | 16.4 | 13202 | 2021-09-29 23:21:54 | MASTER-OAFA | (17h 22m 28.05s , +00d 32m 38.6s) | C | 60 | 16.6 | 13281 | 2021-09-29 23:23:13 | MASTER-OAFA | (17h 30m 27.82s , +00d 30m 33.6s) | C | 60 | 16.8 | 13360 | 2021-09-29 23:24:32 | MASTER-OAFA | (17h 26m 12.96s , +04d 19m 40.6s) | C | 60 | 16.9 | 13440 | 2021-09-29 23:25:52 | MASTER-OAFA | (17h 34m 14.62s , +04d 20m 28.5s) | C | 60 | 16.9 | 13520 | 2021-09-29 23:27:11 | MASTER-OAFA | (17h 22m 14.54s , -01d 23m 18.2s) | C | 60 | 17.1 | 13599 | 2021-09-29 23:28:31 | MASTER-OAFA | (17h 30m 21.22s , -01d 23m 20.2s) | C | 60 | 17.2 | 13678 | 2021-09-29 23:29:50 | MASTER-OAFA | (17h 39m 00.24s , +02d 24m 22.4s) | C | 60 | 17.1 | 13758 | 2021-09-29 23:31:10 | MASTER-OAFA | (17h 47m 03.30s , +02d 25m 58.1s) | C | 60 | 17.1 | 13838 | 2021-09-29 23:32:30 | MASTER-OAFA | (17h 37m 36.22s , +00d 32m 18.2s) | C | 60 | 17.5 | 13921 | 2021-09-29 23:33:53 | MASTER-OAFA | (17h 45m 42.18s , +00d 31m 05.0s) | C | 60 | 17.6 | 14000 | 2021-09-29 23:35:12 | MASTER-OAFA | (17h 23m 43.05s , +02d 24m 41.0s) | C | 60 | 17.5 | 14080 | 2021-09-29 23:36:32 | MASTER-OAFA | (17h 31m 50.09s , +02d 24m 40.7s) | C | 60 | 17.5 | 14159 | 2021-09-29 23:37:51 | MASTER-OAFA | (17h 22m 28.08s , +00d 32m 37.6s) | C | 60 | 17.6 | 14239 | 2021-09-29 23:39:11 | MASTER-OAFA | (17h 30m 27.90s , +00d 30m 28.9s) | C | 60 | 17.6 | 14318 | 2021-09-29 23:40:30 | MASTER-OAFA | (17h 26m 17.60s , +04d 20m 23.9s) | C | 60 | 17.7 | 14397 | 2021-09-29 23:41:49 | MASTER-OAFA | (17h 34m 13.83s , +04d 19m 25.5s) | C | 60 | 17.6 | 14477 | 2021-09-29 23:43:09 | MASTER-OAFA | (17h 22m 15.63s , -01d 21m 21.6s) | C | 60 | 17.8 | 14556 | 2021-09-29 23:44:28 | MASTER-OAFA | (17h 30m 21.24s , -01d 22m 35.0s) | C | 60 | 17.8 | 14636 | 2021-09-29 23:45:47 | MASTER-OAFA | (17h 38m 56.30s , +02d 24m 14.4s) | C | 60 | 17.7 | 14718 | 2021-09-29 23:47:10 | MASTER-OAFA | (17h 47m 02.98s , +02d 24m 26.4s) | C | 60 | 17.6 | 14797 | 2021-09-29 23:48:29 | MASTER-OAFA | (17h 37m 39.84s , +00d 31m 50.6s) | C | 60 | 17.7 | 14881 | 2021-09-29 23:49:53 | MASTER-OAFA | (17h 45m 40.02s , +00d 30m 10.5s) | C | 60 | 17.7 | 14961 | 2021-09-29 23:51:12 | MASTER-OAFA | (17h 23m 48.72s , +02d 26m 27.8s) | C | 60 | 17.7 | 15040 | 2021-09-29 23:52:32 | MASTER-OAFA | (17h 31m 44.29s , +02d 25m 22.9s) | C | 60 | 17.6 | 15119 | 2021-09-29 23:53:51 | MASTER-OAFA | (17h 22m 25.36s , +00d 32m 35.7s) | C | 60 | 17.7 | 15204 | 2021-09-29 23:55:16 | MASTER-OAFA | (17h 30m 31.02s , +00d 31m 22.3s) | C | 60 | 17.7 | 15283 | 2021-09-29 23:56:35 | MASTER-OAFA | (17h 26m 12.73s , +04d 18m 32.0s) | C | 60 | 17.7 | 15363 | 2021-09-29 23:57:55 | MASTER-OAFA | (17h 34m 20.24s , +04d 18m 31.0s) | C | 60 | 17.6 | 15442 | 2021-09-29 23:59:14 | MASTER-OAFA | (17h 22m 17.61s , -01d 21m 52.2s) | C | 60 | 18.0 | 15523 | 2021-09-30 00:00:34 | MASTER-OAFA | (17h 30m 17.50s , -01d 23m 37.6s) | C | 60 | 17.8 | 15607 | 2021-09-30 00:01:59 | MASTER-OAFA | (17h 39m 03.44s , +02d 25m 43.2s) | C | 60 | 17.7 | 15686 | 2021-09-30 00:03:18 | MASTER-OAFA | (17h 46m 58.28s , +02d 24m 54.3s) | C | 60 | 17.5 | 15767 | 2021-09-30 00:04:39 | MASTER-OAFA | (17h 37m 37.58s , +00d 32m 06.8s) | C | 60 | 17.8 | 15849 | 2021-09-30 00:06:01 | MASTER-OAFA | (17h 45m 42.52s , +00d 30m 53.3s) | C | 60 | 17.7 | 15929 | 2021-09-30 00:07:21 | MASTER-OAFA | (17h 29m 56.23s , +06d 12m 30.6s) | C | 60 | 17.5 | 16009 | 2021-09-30 00:08:41 | MASTER-OAFA | (17h 37m 57.28s , +06d 13m 48.9s) | C | 60 | 17.5 | 16089 | 2021-09-30 00:10:01 | MASTER-OAFA | (17h 14m 36.49s , +06d 14m 39.2s) | C | 60 | 17.8 | 16169 | 2021-09-30 00:11:21 | MASTER-OAFA | (17h 22m 34.67s , +06d 13m 33.3s) | C | 60 | 17.6 | 16248 | 2021-09-30 00:12:40 | MASTER-OAFA | (17h 08m 35.85s , +02d 25m 52.5s) | C | 60 | 17.8 | 16331 | 2021-09-30 00:14:03 | MASTER-OAFA | (17h 16m 31.55s , +02d 24m 39.5s) | C | 60 | 17.9 | 16411 | 2021-09-30 00:15:23 | MASTER-OAFA | (17h 10m 58.78s , +04d 20m 38.2s) | C | 60 | 17.9 | 16491 | 2021-09-30 00:16:43 | MASTER-OAFA | (17h 19m 00.96s , +04d 19m 04.4s) | C | 60 | 17.8 | 16570 | 2021-09-30 00:18:02 | MASTER-OAFA | (17h 07m 11.44s , +00d 31m 52.8s) | C | 60 | 18.0 | 16649 | 2021-09-30 00:19:21 | MASTER-OAFA | (17h 15m 11.80s , +00d 32m 39.6s) | C | 60 | 17.8 | 16729 | 2021-09-30 00:20:41 | MASTER-OAFA | (17h 37m 26.07s , -01d 23m 57.8s) | C | 60 | 17.7 | 16808 | 2021-09-30 00:22:00 | MASTER-OAFA | (17h 45m 33.56s , -01d 24m 00.7s) | C | 60 | 17.7 | 16888 | 2021-09-30 00:23:20 | MASTER-OAFA | (17h 29m 53.36s , +06d 13m 55.8s) | C | 60 | 17.7 | 16969 | 2021-09-30 00:24:41 | MASTER-OAFA | (17h 37m 56.96s , +06d 12m 11.1s) | C | 60 | 17.6 | 17049 | 2021-09-30 00:26:00 | MASTER-OAFA | (17h 14m 36.31s , +06d 14m 15.1s) | C | 60 | 17.9 | 17129 | 2021-09-30 00:27:20 | MASTER-OAFA | (17h 22m 35.63s , +06d 13m 27.3s) | C | 60 | 17.9 | 17208 | 2021-09-30 00:28:40 | MASTER-OAFA | (17h 08m 29.57s , +02d 26m 48.6s) | C | 60 | 17.8 | 17288 | 2021-09-30 00:30:00 | MASTER-OAFA | (17h 16m 37.24s , +02d 25m 35.2s) | C | 60 | 17.9 | 17367 | 2021-09-30 00:31:19 | MASTER-OAFA | (17h 10m 54.99s , +04d 18m 43.0s) | C | 60 | 17.8 | 17447 | 2021-09-30 00:32:39 | MASTER-OAFA | (17h 19m 02.63s , +04d 18m 59.2s) | C | 60 | 17.9 | 17529 | 2021-09-30 00:34:01 | MASTER-OAFA | (17h 07m 14.46s , +00d 32m 42.1s) | C | 60 | 18.1 | 17609 | 2021-09-30 00:35:21 | MASTER-OAFA | (17h 15m 14.54s , +00d 30m 47.5s) | C | 60 | 17.7 | 17688 | 2021-09-30 00:36:40 | MASTER-OAFA | (17h 37m 32.70s , -01d 22m 05.9s) | C | 60 | 17.8 | 17772 | 2021-09-30 00:38:04 | MASTER-OAFA | (17h 45m 26.18s , -01d 23m 16.1s) | C | 60 | 17.8 | 17852 | 2021-09-30 00:39:24 | MASTER-OAFA | (17h 29m 50.73s , +06d 14m 09.9s) | C | 60 | 17.5 | 17932 | 2021-09-30 00:40:43 | MASTER-OAFA | (17h 37m 59.45s , +06d 12m 57.8s) | C | 60 | 17.6 | 18011 | 2021-09-30 00:42:03 | MASTER-OAFA | (17h 14m 30.70s , +06d 12m 31.9s) | C | 60 | 17.8 | 18090 | 2021-09-30 00:43:22 | MASTER-OAFA | (17h 22m 40.17s , +06d 12m 44.5s) | C | 60 | 17.7 | 18172 | 2021-09-30 00:44:44 | MASTER-OAFA | (17h 08m 31.96s , +02d 26m 42.5s) | C | 60 | 17.5 | 18252 | 2021-09-30 00:46:04 | MASTER-OAFA | (17h 16m 32.74s , +02d 24m 33.4s) | C | 60 | 17.6 | 18342 | 2021-09-30 00:47:34 | MASTER-OAFA | (17h 11m 00.18s , +04d 20m 09.3s) | C | 60 | 17.9 | 18422 | 2021-09-30 00:48:54 | MASTER-OAFA | (17h 18m 57.06s , +04d 19m 24.5s) | C | 60 | 17.9 | 18502 | 2021-09-30 00:50:14 | MASTER-OAFA | (17h 07m 10.73s , +00d 32m 45.5s) | C | 60 | 18.1 | 18581 | 2021-09-30 00:51:33 | MASTER-OAFA | (17h 15m 18.00s , +00d 31m 32.4s) | C | 60 | 17.6 | 18661 | 2021-09-30 00:52:53 | MASTER-OAFA | (17h 37m 26.15s , -01d 24m 04.4s) | C | 60 | 17.7 | 18740 | 2021-09-30 00:54:12 | MASTER-OAFA | (17h 45m 31.92s , -01d 23m 56.4s) | C | 60 | 17.8 | 18826 | 2021-09-30 00:55:38 | MASTER-OAFA | (17h 41m 29.29s , +04d 18m 05.1s) | C | 60 | 17.6 | 18905 | 2021-09-30 00:56:57 | MASTER-OAFA | (17h 49m 33.99s , +04d 19m 22.2s) | C | 60 | 17.7 | 18985 | 2021-09-30 00:58:17 | MASTER-OAFA | (17h 23m 12.41s , -03d 15m 40.9s) | C | 60 | 18.0 | 19064 | 2021-09-30 00:59:36 | MASTER-OAFA | (17h 31m 18.53s , -03d 16m 55.6s) | C | 60 | 17.9 | 19143 | 2021-09-30 01:00:55 | MASTER-OAFA | (17h 07m 05.65s , -01d 23m 03.8s) | C | 60 | 17.9 | 19225 | 2021-09-30 01:02:17 | MASTER-OAFA | (17h 15m 03.93s , -01d 21m 58.3s) | C | 60 | 17.6 | 19304 | 2021-09-30 01:03:36 | MASTER-OAFA | (17h 38m 30.93s , -03d 16m 12.6s) | C | 60 | 17.7 | 19384 | 2021-09-30 01:04:56 | MASTER-OAFA | (17h 46m 26.63s , -03d 17m 23.7s) | C | 60 | 17.7 | 19463 | 2021-09-30 01:06:15 | MASTER-OAFA | (17h 08m 04.15s , -03d 16m 15.6s) | C | 60 | 17.6 | 19622 | 2021-09-30 01:08:54 | MASTER-OAFA | (17h 45m 11.02s , +06d 13m 32.1s) | C | 60 | 16.4 | 19704 | 2021-09-30 01:10:16 | MASTER-OAFA | (17h 53m 14.73s , +06d 11m 47.8s) | C | 60 | 17.2 | 19784 | 2021-09-30 01:11:36 | MASTER-OAFA | (17h 41m 31.64s , +04d 19m 18.8s) | C | 60 | 17.2 | 19863 | 2021-09-30 01:12:55 | MASTER-OAFA | (17h 49m 28.13s , +04d 18m 27.3s) | C | 60 | 17.3 | 19943 | 2021-09-30 01:14:15 | MASTER-OAFA | (17h 23m 11.95s , -03d 15m 45.3s) | C | 60 | 17.4 | 20023 | 2021-09-30 01:15:35 | MASTER-OAFA | (17h 31m 19.22s , -03d 16m 59.6s) | C | 60 | 17.4 | 20102 | 2021-09-30 01:16:54 | MASTER-OAFA | (17h 07m 00.53s , -01d 23m 18.6s) | C | 60 | 17.2 | 20182 | 2021-09-30 01:18:14 | MASTER-OAFA | (17h 15m 05.71s , -01d 23m 30.1s) | C | 60 | 17.4 | 20262 | 2021-09-30 01:19:34 | MASTER-OAFA | (17h 38m 28.42s , -03d 16m 25.7s) | C | 60 | 17.6 | 20342 | 2021-09-30 01:20:54 | MASTER-OAFA | (17h 46m 28.79s , -03d 18m 25.8s) | C | 60 | 17.5 | 20422 | 2021-09-30 01:22:13 | MASTER-OAFA | (17h 08m 04.50s , -03d 15m 18.3s) | C | 60 | 16.7 | 20583 | 2021-09-30 01:24:55 | MASTER-OAFA | (17h 45m 08.07s , +06d 13m 25.9s) | C | 60 | 17.0 | 20664 | 2021-09-30 01:26:16 | MASTER-OAFA | (17h 53m 17.15s , +06d 12m 13.6s) | C | 60 | 17.5 | 20743 | 2021-09-30 01:27:35 | MASTER-OAFA | (17h 41m 26.12s , +04d 17m 32.4s) | C | 60 | 17.2 | 20823 | 2021-09-30 01:28:55 | MASTER-OAFA | (17h 49m 33.76s , +04d 17m 20.4s) | C | 60 | 17.4 | 20903 | 2021-09-30 01:30:15 | MASTER-OAFA | (17h 23m 14.78s , -03d 16m 08.9s) | C | 60 | 17.6 | 20982 | 2021-09-30 01:31:34 | MASTER-OAFA | (17h 31m 15.19s , -03d 17m 56.5s) | C | 60 | 17.4 | 21062 | 2021-09-30 01:32:54 | MASTER-OAFA | (17h 07m 05.52s , -01d 21m 29.8s) | C | 60 | 16.8 | 21146 | 2021-09-30 01:34:18 | MASTER-OAFA | (17h 14m 59.29s , -01d 22m 34.2s) | C | 60 | 16.8 | 21225 | 2021-09-30 01:35:37 | MASTER-OAFA | (17h 38m 25.11s , -03d 16m 14.5s) | C | 60 | 17.2 | 21308 | 2021-09-30 01:37:00 | MASTER-OAFA | (17h 46m 31.64s , -03d 17m 29.8s) | C | 60 | 17.5 | 21400 | 2021-09-30 01:38:32 | MASTER-OAFA | (17h 07m 57.92s , -03d 17m 16.0s) | C | 60 | 16.4 | 21569 | 2021-09-30 01:41:21 | MASTER-OAFA | (17h 45m 09.94s , +06d 12m 55.8s) | C | 60 | 16.4 | 21655 | 2021-09-30 01:42:47 | MASTER-OAFA | (17h 53m 13.64s , +06d 11m 15.5s) | C | 60 | 17.3 | 21734 | 2021-09-30 01:44:06 | MASTER-OAFA | (17h 19m 14.00s , +08d 06m 49.4s) | C | 60 | 14.5 | 21814 | 2021-09-30 01:45:26 | MASTER-OAFA | (17h 27m 20.08s , +08d 07m 37.7s) | C | 60 | 15.5 | 21893 | 2021-09-30 01:46:45 | MASTER-OAFA | (17h 34m 37.80s , +08d 05m 27.0s) | C | 60 | 15.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.

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[vsnet-grb-info 28794] GRB 210930A: Swift detection of a burst
by GCN Circulars 30 Sep '21

30 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30897 SUBJECT: GRB 210930A: Swift detection of a burst DATE: 21/09/30 02:58:45 GMT FROM: Mike Siegel at PSU/Swift MOC <siegel(a)swift.psu.edu> V. D'Elia (SSDC & INAF-OAR), E. Ambrosi (INAF-IASFPA), S. Laha (GSFC/UMBC/CRESST), A. Y. Lien (U Tampa), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team: At 02:46:52 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 210930A (trigger=1075565). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 197.435, +48.623 which is RA(J2000) = 13h 09m 44s Dec(J2000) = +48d 37' 22" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 15 sec. The peak count rate was ~800 counts/sec (15-350 keV), at ~8 sec after the trigger. The XRT began observing the field at 02:49:12.3 UT, 140.1 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 197.40185, 48.62853 which is equivalent to: RA(J2000) = 13h 09m 36.44s Dec(J2000) = +48d 37' 42.7" with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 81 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (9.55 x 10^19 cm^-2, Willingale et al. 2013), with an excess column of 6.4 (+3.87/-3.20) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 150 seconds with the White filter starting 143 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.010. Burst Advocate for this burst is V. D'Elia (valerio.delia AT ssdc.asi.it). 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/)

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[vsnet-grb-info 28793] GRB 210929B: Fermi GBM Final Real-time Localization
by GCN Circulars 29 Sep '21

29 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30896 SUBJECT: GRB 210929B: Fermi GBM Final Real-time Localization DATE: 21/09/29 19:53:46 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 19:42:22 UT on 29 Sep 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210929B (trigger 654637347.41104 / 210929821). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 263.0, Dec = 2.4 (J2000 degrees, equivalent to J2000 17h 32m, 2d 23'), with a statistical uncertainty of 13.3 degrees. The angle from the Fermi LAT boresight is 70.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210929821/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210929821/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210929821/…

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[vsnet-grb-info 28792] Fermi-LAT Gamma-ray Observations of IceCubeCascade-210926A
by GCN Circulars 29 Sep '21

29 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30895 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCubeCascade-210926A DATE: 21/09/29 07:56:48 GMT FROM: Simone Garrappa at DESY <simone.garrappa(a)desy.de> S. Garrappa (DESY-Zeuthen), S. Buson (Univ. of Wuerzburg) and R. de Menezes (Univ. of Sao Paulo, Univ. of Wuerzburg) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the high-energy IC210926A neutrino event (<https://gcn.gsfc.nasa.gov/notices_amon_icecube_cascade/135747_58376130.amon>) with all-sky survey data from the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope. The IceCube event was detected on 2021-09-26 at 05:26:10.94 UT (T0) with J2000 position RA = 249.4993 deg, Decl. = -35.7347 deg (centered at an error region with 10.18⁰ radius, 90% PSF containment). Several cataloged gamma-ray (>100 MeV) sources are located within the 90% IC210926A localization region (4FGL-DR2, The Fermi-LAT collaboration 2020, ApJS, 247, 33). We searched for intermediate (days to month) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (> 5 sigma) new excess emission (> 100 MeV) at the IC210926A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC210926A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 6.3e-9 (< 5.6e-8) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0. Since Fermi normally operates in an all-sky scanning mode, regular monitoring of this source will continue. For these observations the Fermi-LAT contact persons are S. Garrappa (simone.garrappa at desy.de) and S. Buson (sara.buson at uni-wuerzburg.de). The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.

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[vsnet-grb-info 28791] GRB 210929A: Fermi GBM Final Real-time Localization
by GCN Circulars 29 Sep '21

29 Sep '21

TITLE: GCN CIRCULAR NUMBER: 30894 SUBJECT: GRB 210929A: Fermi GBM Final Real-time Localization DATE: 21/09/29 03:51:22 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 03:41:39 UT on 29 Sep 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210929A (trigger 654579704.256098 / 210929154). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 317.8, Dec = 12.3 (J2000 degrees, equivalent to J2000 21h 11m, 12d 18'), with a statistical uncertainty of 14.1 degrees. The angle from the Fermi LAT boresight is 67.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210929154/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210929154/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210929154/…

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