December 2023 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 33298] LIGO/Virgo/KAGRA S231231ag: Updated Sky localization and Source Classification
by GCN Circulars 31 Dec '23

31 Dec '23

TITLE: GCN CIRCULAR NUMBER: 35446 SUBJECT: LIGO/Virgo/KAGRA S231231ag: Updated Sky localization and Source Classification DATE: 23/12/31 22:52:04 GMT FROM: Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman(a)utexas.edu> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further analysis of the LIGO Hanford Observatory (H1) data around the time of the compact binary merger (CBC) candidate S231231ag (GCN Circular 35445). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/superevents/S231231ag After parameter estimation by RapidPE-RIFT [2], the updated classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%). For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 27061 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1066 +/- 339 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/. [1] Ashton et al. ApJS 241, 27 (2019) and Morisaki et al. arXiv:2307.13380 (2023) [2] Rose et al. arXiv:2201.05263 (2022) and Pankow et al. PRD 92, 023002 (2015) View this GCN Circular online at https://gcn.nasa.gov/circulars/35446. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 33297] LIGO/Virgo/KAGRA S231231ag: Identification of a GW compact binary merger candidate
by GCN Circulars 31 Dec '23

31 Dec '23

TITLE: GCN CIRCULAR NUMBER: 35445 SUBJECT: LIGO/Virgo/KAGRA S231231ag: Identification of a GW compact binary merger candidate DATE: 23/12/31 16:10:22 GMT FROM: Keita Kawabe at LIGO Hanford <kkawabe(a)caltech.edu> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We identified the compact binary merger candidate S231231ag during real-time processing of data from LIGO Hanford Observatory (H1) at 2023-12-31 15:40:16.670 UTC (GPS time: 1388072434.670). The candidate was found by the GstLAL [1] analysis pipeline. S231231ag is an event of interest because its false alarm rate, as estimated by the online analysis, is 8.4e-15 Hz, or about one in 1e7 years. The event's properties can be found at this URL: https://gracedb.ligo.org/superevents/S231231ag The classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%). Assuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is <1%. Two sky maps are available at this time and can be retrieved from the GraceDB event page: * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 27 seconds after the candidate event time. * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 5 minutes after the candidate event time. The preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 24218 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1114 +/- 357 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/. [1] Tsukada et al. PRD 108, 043004 (2023) and Ewing et al. arXiv:2305.05625 (2023) [2] Chatterjee et al. ApJ 896, 54 (2020) [3] Singer & Price PRD 93, 024013 (2016) View this GCN Circular online at https://gcn.nasa.gov/circulars/35445. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 33296] GRB231230A: Fermi GBM Observation
by GCN Circulars 30 Dec '23

30 Dec '23

TITLE: GCN CIRCULAR NUMBER: 35444 SUBJECT: GRB231230A: Fermi GBM Observation DATE: 23/12/30 18:40:14 GMT FROM: Cori Fletcher at USRA <cfletcher(a)usra.edu> C. Fletcher (USRA) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 01:29:10.05 UT on 30 December 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB231230A (trigger 725592555/231230062). which was also detected by Swift-BAT (Moss et al. 2023, GCN 35436). The Fermi GBM Real-time Localization (GCN 35434) is consistent with the Swift-BAT position. The angle from the Fermi LAT boresight is 157 degrees. The GBM light curve consists of multiple spikes with a duration (T90) of about 17 s (50-300 keV). The time-averaged spectrum from T0-2.6 to T0+17.9 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.2 +/- 0.2 and the cutoff energy, parameterized as Epeak, is 220 +/- 40 keV. The event fluence (10-1000 keV) in this time interval is (6.1 +/- 0.5)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+9.3 s in the 10-1000 keV band is 5 +/- 1 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/35444. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 33295] GRB 231230A: Swift-XRT refined Analysis
by GCN Circulars 30 Dec '23

30 Dec '23

TITLE: GCN CIRCULAR NUMBER: 35443 SUBJECT: GRB 231230A: Swift-XRT refined Analysis DATE: 23/12/30 16:44:29 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU), J. D. Gropp (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), R. Brivio (INAF-OAB), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAR) and P.A. Evans report on behalf of the Swift-XRT team: We have analysed 9.1 ks of XRT data for GRB 231230A, from 127 s to 41.2 ks after the BAT trigger. The data comprise 68 s in Windowed Timing (WT) mode (the first 8 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The light curve can be modelled with an initial power-law decay with an index of alpha=0.835 (+0.027, -0.028), followed by a break at T+17.4 ks to an alpha of 2.0 (+/-0.4). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.93 (+/-0.13). The best-fitting absorption column is 4.0 (+0.7, -0.6) x 10^21 cm^-2, in excess of the Galactic value of 1.3 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.1 x 10^-11 (6.1 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 4.0 (+0.7, -0.6) x 10^21 cm^-2 Galactic foreground: 1.3 x 10^20 cm^-2 Excess significance: 9.9 sigma Photon index: 1.93 (+/-0.13) If the light curve continues to decay with a power-law decay index of 2.0, the count rate at T+24 hours will be 5.1 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.1 x 10^-13 (3.1 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/01205319. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/35443. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 33294] GRB 231230A: GOTO optical upper limits
by GCN Circulars 30 Dec '23

30 Dec '23

TITLE: GCN CIRCULAR NUMBER: 35442 SUBJECT: GRB 231230A: GOTO optical upper limits DATE: 23/12/30 12:19:49 GMT FROM: Amit Kumar at University of Warwick, UK <amitkundu515(a)gmail.com> A. Kumar; B. P. Gompertz; G. Ramsay; R. Starling; K. Ulaczyk; K. Ackley; M. J. Dyer; J. Lyman; F. Jimenez-Ibarra; D. O'Neill; D. Steeghs; D. K. Galloway; V. Dhillon; P. O'Brien; K. Noysena; R. Kotak; R. P. Breton; L. K. Nuttall; E. Pall'e and D. Pollacco report on behalf of the GOTO collaboration: The Gravitational-wave Optical Transient Observer (GOTO, Steeghs et al. 2022) performed a targeted observation in response to Fermi and Swift detected GRB 231230A (Fermi GBM Team, GCN 35434; Moss et al., GCN 35436) at 05:32:28; 05:47:36 and 06:40:25 UT on 2023-12-30 (at respectively ~4.1, 4.3 and 5.2 hours after the trigger). Each set of observations consisted of 4x90s exposures in the GOTO L-band (400-700 nm). Images were processed immediately after acquisition using the GOTO pipeline. No optical counterpart is detected within the enhanced Swift-XRT position (Evans et al., GCN 35437; Osborne et al., GCN 35441) in any of the three sets of observations up to the 5-sigma limits of L > 18.7, 19.0 and 19.5 magnitudes (AB), respectively. The upper limits are consistent with those reported by Zhu et al., GCN 35439 and Kuin et al., GCN 35440. Magnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are 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/35442. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 33293] GRB 231230A: Enhanced Swift-XRT position
by GCN Circulars 30 Dec '23

30 Dec '23

TITLE: GCN CIRCULAR NUMBER: 35441 SUBJECT: GRB 231230A: Enhanced Swift-XRT position DATE: 23/12/30 12:12:48 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.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 2051 s of XRT Photon Counting mode data and 3 UVOT images for GRB 231230A, 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 = 245.21436, +58.12396 which is equivalent to: RA (J2000): 16h 20m 51.45s Dec (J2000): +58d 07' 26.2" with an uncertainty of 2.1 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/35441. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 33292] GRB 231230A: Swift/UVOT Upper Limits
by GCN Circulars 30 Dec '23

30 Dec '23

TITLE: GCN CIRCULAR NUMBER: 35440 SUBJECT: GRB 231230A: Swift/UVOT Upper Limits DATE: 23/12/30 11:25:57 GMT FROM: Paul Kuin at MSSL <npkuin(a)gmail.com> N. P. M. Kuin (UCL-MSSL) and M. J. Moss (GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 231230A 1511 s after the BAT trigger (Moss et al., GCN Circ. 35436). No optical afterglow consistent with the XRT position 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 initial exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white 1511 1705 39 >18.9 b 1661 1681 19 >18.5 w1 1612 1632 19 >18.0 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.014 in the direction of the burst (Schlegel et al. 1998). View this GCN Circular online at https://gcn.nasa.gov/circulars/35440. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 33291] GRB 231230A: NOT optical upper limits
by GCN Circulars 30 Dec '23

30 Dec '23

TITLE: GCN CIRCULAR NUMBER: 35439 SUBJECT: GRB 231230A: NOT optical upper limits DATE: 23/12/30 09:03:02 GMT FROM: Zipei Zhu at NAOC <zpzhu(a)nao.cas.cn> Z. Zhu, D. Xu (NAOC) report on behalf a larger collaboration: We observed the position of GRB 231230A (Moss et al., GCN 35436) using the Nordic Optical Telescope equipped with the ALFOSC images. Observations were carried out with the SDSS r and z filters, with an exposure time of 3x300 s and 5x200 s respectively. No new objects were dectected in our stacked image within or around the enhanced XRT position (Evans et al., GCN 35437), down to magnitudes r > 23.4 @ T-mid = 4.02 hr and z > 22.7 @ T-mid = 4.32 hr, calibrated with the nearby Pan-STARRS field. View this GCN Circular online at https://gcn.nasa.gov/circulars/35439. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 33290] Fermi trigger No 725592555: Global MASTER-Net observations report
by GCN Circulars 30 Dec '23

30 Dec '23

TITLE: GCN CIRCULAR NUMBER: 35438 SUBJECT: Fermi trigger No 725592555: Global MASTER-Net observations report DATE: 23/12/30 02:31:08 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 GRB231230.06 (trigger No 725592555,16h 02m 48.00s , +53d 33m 36.0s, R=5.2) errorbox 27 sec after notice time and 67 sec after trigger time at 2023-12-30 01:30:17 UT, with upper limit up to 18.8 mag. The observations began at zenith distance = 54 deg. The sun altitude is -39.8 deg. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB231230.06 errorbox 31 sec after notice time and 70 sec after trigger time at 2023-12-30 01:30:20 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 51 deg. The sun altitude is -34.0 deg. The galactic latitude b = 46 deg., longitude l = 83 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2346192 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 72 | 2023-12-30 01:30:17 | MASTER-Tavrida | (16h 17m 04.69s , +58d 19m 55.5s) | C | 10 | 16.1 | 76 | 2023-12-30 01:30:20 | MASTER-Kislovodsk | (16h 20m 43.99s , +58d 12m 56.6s) | P- | 10 | 16.0 | 96 | 2023-12-30 01:30:20 | MASTER-Kislovodsk | (16h 20m 44.00s , +58d 12m 56.4s) | P- | 50 | 16.7 | Coadd 296 | 2023-12-30 01:30:20 | MASTER-Kislovodsk | (16h 20m 44.02s , +58d 12m 56.4s) | P- | 450 | 18.1 | Coadd 76 | 2023-12-30 01:30:20 | MASTER-Kislovodsk | (16h 20m 50.60s , +57d 49m 40.1s) | P| | 10 | 15.8 | 94 | 2023-12-30 01:30:34 | MASTER-Tavrida | (16h 17m 00.75s , +58d 21m 06.8s) | C | 20 | 17.7 | 99 | 2023-12-30 01:30:38 | MASTER-Kislovodsk | (16h 20m 41.06s , +58d 14m 25.8s) | P- | 20 | 16.3 | 99 | 2023-12-30 01:30:38 | MASTER-Kislovodsk | (16h 20m 47.74s , +57d 51m 05.7s) | P| | 20 | 16.0 | 121 | 2023-12-30 01:31:01 | MASTER-Tavrida | (16h 17m 00.87s , +58d 19m 35.8s) | C | 20 | 17.7 | 127 | 2023-12-30 01:31:06 | MASTER-Kislovodsk | (16h 20m 40.99s , +58d 12m 52.9s) | P- | 20 | 16.2 | 127 | 2023-12-30 01:31:06 | MASTER-Kislovodsk | (16h 20m 47.67s , +57d 49m 30.9s) | P| | 20 | 16.0 | 153 | 2023-12-30 01:31:28 | MASTER-Tavrida | (16h 17m 02.82s , +58d 21m 12.3s) | C | 30 | 17.7 | 160 | 2023-12-30 01:31:34 | MASTER-Kislovodsk | (16h 20m 42.77s , +58d 14m 17.4s) | P- | 30 | 16.6 | 205 | 2023-12-30 01:31:34 | MASTER-Kislovodsk | (16h 20m 42.79s , +58d 14m 17.4s) | P- | 120 | 17.3 | Coadd 160 | 2023-12-30 01:31:34 | MASTER-Kislovodsk | (16h 20m 49.48s , +57d 50m 53.6s) | P| | 30 | 16.5 | 194 | 2023-12-30 01:32:04 | MASTER-Tavrida | (16h 16m 57.77s , +58d 20m 30.2s) | C | 40 | 17.9 | 205 | 2023-12-30 01:32:15 | MASTER-Kislovodsk | (16h 20m 38.05s , +58d 13m 34.8s) | P- | 40 | 16.5 | 205 | 2023-12-30 01:32:15 | MASTER-Kislovodsk | (16h 20m 44.77s , +57d 50m 10.1s) | P| | 40 | 16.6 | 241 | 2023-12-30 01:32:51 | MASTER-Tavrida | (16h 16m 57.61s , +58d 21m 31.8s) | C | 40 | 17.9 | 258 | 2023-12-30 01:33:02 | MASTER-Kislovodsk | (16h 20m 36.90s , +58d 14m 34.1s) | P- | 50 | 16.6 | 258 | 2023-12-30 01:33:02 | MASTER-Kislovodsk | (16h 20m 43.71s , +57d 51m 08.3s) | P| | 50 | 16.5 | 293 | 2023-12-30 01:33:38 | MASTER-Tavrida | (16h 17m 04.48s , +58d 20m 32.5s) | C | 50 | 17.8 | 321 | 2023-12-30 01:34:01 | MASTER-Kislovodsk | (16h 20m 42.65s , +58d 13m 34.1s) | P- | 60 | 16.8 | 431 | 2023-12-30 01:34:01 | MASTER-Kislovodsk | (16h 20m 42.67s , +58d 13m 34.2s) | P- | 280 | 17.8 | Coadd 321 | 2023-12-30 01:34:01 | MASTER-Kislovodsk | (16h 20m 49.59s , +57d 50m 08.0s) | P| | 60 | 16.6 | 359 | 2023-12-30 01:34:34 | MASTER-Tavrida | (16h 16m 56.53s , +58d 19m 34.4s) | C | 70 | 18.3 | 395 | 2023-12-30 01:35:09 | MASTER-Kislovodsk | (16h 20m 37.78s , +58d 12m 35.3s) | P- | 70 | 17.3 | 395 | 2023-12-30 01:35:09 | MASTER-Kislovodsk | (16h 20m 44.75s , +57d 49m 07.7s) | P| | 70 | 16.6 | 443 | 2023-12-30 01:35:52 | MASTER-Tavrida | (16h 17m 03.59s , +58d 19m 57.0s) | C | 80 | 18.5 | 540 | 2023-12-30 01:37:20 | MASTER-Tavrida | (16h 17m 00.09s , +58d 21m 22.3s) | C | 100 | 18.5 | 636 | 2023-12-30 01:38:46 | MASTER-Kislovodsk | (16h 02m 27.05s , +53d 39m 50.5s) | C | 120 | 17.6 | 636 | 2023-12-30 01:38:46 | MASTER-Kislovodsk | (16h 09m 07.97s , +53d 16m 19.9s) | C | 120 | 17.6 | 657 | 2023-12-30 01:39:07 | MASTER-Tavrida | (16h 17m 00.01s , +58d 20m 00.6s) | C | 120 | 18.7 | 786 | 2023-12-30 01:41:06 | MASTER-Kislovodsk | (16h 02m 33.80s , +53d 38m 53.9s) | C | 140 | 17.7 | 786 | 2023-12-30 01:41:06 | MASTER-Kislovodsk | (16h 09m 14.75s , +53d 15m 23.7s) | C | 140 | 17.8 | 801 | 2023-12-30 01:41:15 | MASTER-Tavrida | (16h 17m 02.18s , +58d 21m 19.6s) | C | 150 | 18.7 | 975 | 2023-12-30 01:43:54 | MASTER-Tavrida | (16h 16m 55.78s , +58d 20m 46.6s) | C | 180 | 18.7 | 1038 | 2023-12-30 01:45:13 | MASTER-Kislovodsk | (16h 20m 48.34s , +58d 11m 29.1s) | P- | 150 | 17.5 | 1038 | 2023-12-30 01:45:13 | MASTER-Kislovodsk | (16h 20m 50.95s , +57d 48m 26.9s) | P| | 150 | 17.0 | 1162 | 2023-12-30 01:47:01 | MASTER-Tavrida | (16h 16m 54.97s , +58d 21m 49.8s) | C | 180 | 18.6 | 1211 | 2023-12-30 01:47:51 | MASTER-Kislovodsk | (16h 20m 46.41s , +58d 12m 57.8s) | P- | 180 | 17.8 | 1391 | 2023-12-30 01:47:51 | MASTER-Kislovodsk | (16h 20m 46.42s , +58d 12m 57.7s) | P- | 540 | 18.3 | Coadd 1211 | 2023-12-30 01:47:51 | MASTER-Kislovodsk | (16h 20m 48.30s , +57d 50m 04.0s) | P| | 180 | 17.0 | 1350 | 2023-12-30 01:50:10 | MASTER-Tavrida | (16h 17m 02.26s , +58d 20m 52.3s) | C | 180 | 18.5 | 1412 | 2023-12-30 01:51:12 | MASTER-Kislovodsk | (16h 20m 46.25s , +58d 11m 36.8s) | P- | 180 | 17.8 | 1412 | 2023-12-30 01:51:12 | MASTER-Kislovodsk | (16h 20m 48.31s , +57d 48m 43.3s) | P| | 180 | 17.0 | 1537 | 2023-12-30 01:53:16 | MASTER-Tavrida | (16h 16m 56.20s , +58d 19m 55.3s) | C | 180 | 18.8 | 1725 | 2023-12-30 01:56:24 | MASTER-Tavrida | (16h 17m 00.90s , +58d 20m 22.4s) | C | 180 | 18.8 | 1813 | 2023-12-30 01:57:53 | MASTER-Kislovodsk | (16h 20m 43.05s , +58d 12m 28.9s) | P- | 180 | 17.3 | 1813 | 2023-12-30 01:57:53 | MASTER-Kislovodsk | (16h 20m 45.55s , +57d 49m 38.0s) | P| | 180 | 16.8 | 1912 | 2023-12-30 01:59:31 | MASTER-Tavrida | (16h 16m 57.52s , +58d 21m 49.8s) | C | 180 | 18.5 | 2014 | 2023-12-30 02:01:13 | MASTER-Kislovodsk | (16h 20m 42.70s , +58d 13m 37.3s) | P- | 180 | 17.8 | 2194 | 2023-12-30 02:01:13 | MASTER-Kislovodsk | (16h 20m 42.72s , +58d 13m 37.3s) | P- | 540 | 18.4 | Coadd 2014 | 2023-12-30 02:01:13 | MASTER-Kislovodsk | (16h 20m 45.48s , +57d 50m 46.9s) | P| | 180 | 17.0 | 2099 | 2023-12-30 02:02:38 | MASTER-Tavrida | (16h 16m 57.22s , +58d 20m 31.9s) | C | 180 | 18.4 | 2214 | 2023-12-30 02:04:34 | MASTER-Kislovodsk | (16h 20m 47.65s , +58d 12m 41.9s) | P- | 180 | 17.8 | 2214 | 2023-12-30 02:04:34 | MASTER-Kislovodsk | (16h 20m 50.49s , +57d 49m 53.0s) | P| | 180 | 17.2 | 2288 | 2023-12-30 02:05:48 | MASTER-Tavrida | (16h 16m 58.89s , +58d 21m 45.0s) | C | 180 | 18.5 | 2417 | 2023-12-30 02:07:56 | MASTER-Kislovodsk | (16h 20m 41.31s , +58d 11m 47.9s) | P- | 180 | 17.8 | 2417 | 2023-12-30 02:07:56 | MASTER-Kislovodsk | (16h 20m 44.33s , +57d 48m 59.3s) | P| | 180 | 17.1 | 2476 | 2023-12-30 02:08:56 | MASTER-Tavrida | (16h 16m 53.16s , +58d 21m 09.6s) | C | 180 | 18.1 | 2617 | 2023-12-30 02:11:17 | MASTER-Kislovodsk | (16h 20m 47.85s , +58d 11m 55.1s) | P- | 180 | 18.0 | 2797 | 2023-12-30 02:11:17 | MASTER-Kislovodsk | (16h 20m 47.85s , +58d 11m 55.1s) | P- | 540 | 18.5 | Coadd 2617 | 2023-12-30 02:11:17 | MASTER-Kislovodsk | (16h 20m 51.03s , +57d 49m 06.2s) | P| | 180 | 17.3 | 2666 | 2023-12-30 02:12:05 | MASTER-Tavrida | (16h 16m 52.37s , +58d 22m 12.4s) | C | 180 | 17.8 | 2818 | 2023-12-30 02:14:37 | MASTER-Kislovodsk | (16h 20m 44.88s , +58d 13m 36.8s) | P- | 180 | 18.0 | 2818 | 2023-12-30 02:14:37 | MASTER-Kislovodsk | (16h 20m 48.14s , +57d 50m 48.0s) | P| | 180 | 17.0 | 2855 | 2023-12-30 02:15:14 | MASTER-Tavrida | (16h 16m 59.67s , +58d 21m 14.6s) | C | 180 | 18.0 | 3018 | 2023-12-30 02:17:58 | MASTER-Kislovodsk | (16h 20m 44.67s , +58d 12m 30.2s) | P- | 180 | 17.8 | 3018 | 2023-12-30 02:17:58 | MASTER-Kislovodsk | (16h 20m 48.19s , +57d 49m 42.7s) | P| | 180 | 17.2 | 3042 | 2023-12-30 02:18:21 | MASTER-Tavrida | (16h 16m 52.55s , +58d 20m 17.3s) | C | 180 | 18.2 | 3219 | 2023-12-30 02:21:18 | MASTER-Kislovodsk | (16h 20m 47.36s , +58d 13m 49.8s) | P- | 180 | 17.7 | 3219 | 2023-12-30 02:21:19 | MASTER-Kislovodsk | (16h 20m 51.23s , +57d 51m 02.1s) | P| | 180 | 17.0 | 3229 | 2023-12-30 02:21:29 | MASTER-Tavrida | (16h 16m 57.32s , +58d 20m 28.7s) | C | 180 | 18.2 | 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/35438. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 33289] GRB 231230A: Prompt enhanced Swift-XRT position
by GCN Circulars 30 Dec '23

30 Dec '23

TITLE: GCN CIRCULAR NUMBER: 35437 SUBJECT: GRB 231230A: Prompt enhanced Swift-XRT position DATE: 23/12/30 02:04:59 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Using promptly downlinked XRT event data for GRB 231230A, we find an enhanced XRT position of the afterglow: RA, Dec: 245.21382, 58.12618 which is equivalent to: RA (J2000) = 16 20 51.32 Dec (J2000) = +58 07 34.2 with an uncertainty of 1.9 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/1205319. Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/35437. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

2024

2023

2022

2021

vsnet-grb-info December 2023