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

[vsnet-grb-info 33692] Swift BAT Triggers 1218081 and 1218082 are not astrophysical
by GCN Circulars 29 Feb '24

29 Feb '24

TITLE: GCN CIRCULAR NUMBER: 35840 SUBJECT: Swift BAT Triggers 1218081 and 1218082 are not astrophysical DATE: 24/02/29 20:32:53 GMT FROM: Jamie Kennea at Penn State <jak51(a)psu.edu> J. A. Kennea (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: Swift BAT Triggers 1218081 and 1218082 are due to an outage of the star trackers, and are therefore not astrophysical. View this GCN Circular online at https://gcn.nasa.gov/circulars/35840. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33691] GRB 240225B: further SAO RAS optical observations
by GCN Circulars 29 Feb '24

29 Feb '24

TITLE: GCN CIRCULAR NUMBER: 35839 SUBJECT: GRB 240225B: further SAO RAS optical observations DATE: 24/02/29 18:48:28 GMT FROM: Moskvitin Alexander at SAO RAS <mosk(a)sao.ru> A. S. Moskvitin, O. I. Spiridonova (SAO RAS) report on behalf of the GRB follow-up team. We observed the field of GRB 240225B (Nakajima et al., GCN 35796; Evans, GCN 35797; Joshi et al., GCN 35798; D'Ai et al., GCN 35810; Kawakubo et al., GCN 35811; Frederiks et al., GCN 35835) with the SAO RAS 1m telescope Zeiss-1000 equipped with CCD-photometer. We obtained 8 x 300 sec frames in the Rc band on Feb. 29, 17:11:52--18:03:46 UT (t_mid - T0 = 3.8903 days). The OT (Gompertz et al., GCN 35805; Liu et al., GCN 35812; Malesani et al., GCN 35819; Wise et al., GCN 35820; Gompertz & Malesani, GCN 35824; Pankov et al., GCN 35826; Ror et al., GCN 35830; Sasada et al., GCN 35831; Schneider et al., GCN 35832) is clearly detected in our stacked frame with the brightness of R = 21.11 +/- 0.04. The photometry is based on nearby SDSS stars (magnitudes converted with Lupton 2005 equations). View this GCN Circular online at https://gcn.nasa.gov/circulars/35839. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33690] Fermi GRB 240229A: Global MASTER-Net observations report
by GCN Circulars 29 Feb '24

29 Feb '24

TITLE: GCN CIRCULAR NUMBER: 35838 SUBJECT: Fermi GRB 240229A: Global MASTER-Net observations report DATE: 24/02/29 18:31:22 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-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB 240229A ( Fermi GBM team, GCN 35833) errorbox 565 sec after notice time and 608 sec after trigger time at 2024-02-29 14:17:15 UT, with upper limit up to 17.3 mag. The observations began at zenith distance = 57 deg. The sun altitude is -44.1 deg. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 240229A errorbox 12048 sec after notice time and 12090 sec after trigger time at 2024-02-29 17:28:37 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 80 deg. The sun altitude is -28.0 deg. The galactic latitude b = 78 deg., longitude l = 336 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2388695 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 668 | 2024-02-29 14:17:15 | MASTER-Amur | (13h 15m 43.59s , +16d 45m 26.5s) | C | 120 | 16.8 | 823 | 2024-02-29 14:19:34 | MASTER-Amur | (13h 15m 45.52s , +16d 46m 56.6s) | C | 150 | 17.1 | 1008 | 2024-02-29 14:22:24 | MASTER-Amur | (13h 15m 40.46s , +16d 45m 49.5s) | C | 180 | 17.1 | 1207 | 2024-02-29 14:25:44 | MASTER-Amur | (13h 15m 39.17s , +16d 46m 37.0s) | C | 180 | 17.1 | 1407 | 2024-02-29 14:29:03 | MASTER-Amur | (13h 15m 45.28s , +16d 45m 24.1s) | C | 180 | 17.1 | 1606 | 2024-02-29 14:32:22 | MASTER-Amur | (13h 15m 39.10s , +16d 44m 09.9s) | C | 180 | 17.0 | 2526 | 2024-02-29 14:48:42 | MASTER-Amur | (13h 18m 12.51s , +18d 16m 37.4s) | C | 60 | 16.4 | 2605 | 2024-02-29 14:50:02 | MASTER-Amur | (13h 26m 32.91s , +18d 16m 02.2s) | C | 60 | 16.6 | 2779 | 2024-02-29 14:52:55 | MASTER-Amur | (13h 10m 35.17s , +18d 15m 01.2s) | C | 60 | 16.6 | 3726 | 2024-02-29 15:08:42 | MASTER-Amur | (13h 18m 05.95s , +18d 14m 13.0s) | C | 60 | 16.9 | 3806 | 2024-02-29 15:10:02 | MASTER-Amur | (13h 26m 39.19s , +18d 14m 47.0s) | C | 60 | 17.2 | 3972 | 2024-02-29 15:12:49 | MASTER-Amur | (13h 10m 34.58s , +18d 13m 28.9s) | C | 60 | 17.3 | 4802 | 2024-02-29 15:26:39 | MASTER-Amur | (13h 18m 12.01s , +18d 14m 50.4s) | C | 60 | 17.1 | 4882 | 2024-02-29 15:27:59 | MASTER-Amur | (13h 26m 31.08s , +18d 14m 32.1s) | C | 60 | 17.1 | 5041 | 2024-02-29 15:30:38 | MASTER-Amur | (13h 10m 36.75s , +18d 13m 13.8s) | C | 60 | 17.2 | 7843 | 2024-02-29 16:17:19 | MASTER-Amur | (13h 10m 09.39s , +16d 15m 21.3s) | C | 60 | 16.6 | 8555 | 2024-02-29 16:29:11 | MASTER-Amur | (13h 18m 24.16s , +16d 15m 56.3s) | C | 60 | 16.4 | 8861 | 2024-02-29 16:34:17 | MASTER-Amur | (13h 10m 09.58s , +16d 15m 00.1s) | C | 60 | 16.5 | 9561 | 2024-02-29 16:45:58 | MASTER-Amur | (13h 18m 31.22s , +16d 15m 28.9s) | C | 60 | 16.5 | 9802 | 2024-02-29 16:49:58 | MASTER-Amur | (13h 10m 05.38s , +16d 12m 45.1s) | C | 60 | 16.5 | 10645 | 2024-02-29 17:04:01 | MASTER-Amur | (13h 18m 25.32s , +16d 12m 21.5s) | C | 60 | 16.4 | 12121 | 2024-02-29 17:28:37 | MASTER-Kislovodsk | (13h 07m 59.15s , +18d 23m 53.3s) | C | 60 | 17.2 | 12915 | 2024-02-29 17:41:52 | MASTER-Kislovodsk | (13h 07m 19.51s , +16d 29m 19.2s) | C | 60 | 17.2 | 12995 | 2024-02-29 17:43:12 | MASTER-Kislovodsk | (13h 15m 39.59s , +16d 30m 02.2s) | C | 60 | 16.9 | 13154 | 2024-02-29 17:45:51 | MASTER-Kislovodsk | (13h 07m 59.06s , +18d 22m 14.0s) | C | 60 | 17.4 | 13551 | 2024-02-29 17:52:28 | MASTER-Kislovodsk | (13h 15m 32.94s , +18d 24m 05.9s) | C | 60 | 16.9 | 13710 | 2024-02-29 17:55:07 | MASTER-Kislovodsk | (13h 23m 59.86s , +18d 21m 58.6s) | C | 60 | 17.1 | 14809 | 2024-02-29 18:12:26 | MASTER-Amur | (13h 22m 10.81s , +14d 44m 23.7s) | R | 180 | 15.4 | 15019 | 2024-02-29 18:15:56 | MASTER-Amur | (13h 20m 47.98s , +15d 00m 15.9s) | R | 180 | 15.0 | 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/35838. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33689] IceCube Alert 240229.66: Global MASTER-Net observations report
by GCN Circulars 29 Feb '24

29 Feb '24

TITLE: GCN CIRCULAR NUMBER: 35837 SUBJECT: IceCube Alert 240229.66: Global MASTER-Net observations report DATE: 24/02/29 16:26:43 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-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) was pointed to the IceCube Alert 240229.66 (trigger No 47725621,04h 49m 48.72s , +15d 59m 45.6s, R=0.51) errorbox 15 sec after notice time and 67 sec after trigger time at 2024-02-29 15:49:29 UT, with upper limit up to 13.5 mag. The observations began at zenith distance = 78 deg. The sun altitude is -47.7 deg. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the IceCube Alert 240229.66 errorbox 297 sec after notice time and 349 sec after trigger time at 2024-02-29 15:54:10 UT, with upper limit up to 17.5 mag. Observations started at twilight. The observations began at zenith distance = 28 deg. The sun altitude is -10.9 deg. MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the IceCube Alert 240229.66 errorbox 1277 sec after notice time and 1329 sec after trigger time at 2024-02-29 16:10:31 UT, with upper limit up to 15.2 mag. Observations started at twilight. The observations began at zenith distance = 29 deg. The sun altitude is -8.1 deg. The galactic latitude b = -17 deg., longitude l = 184 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2388732 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 72 | 2024-02-29 15:49:29 | MASTER-Amur | (04h 51m 01.21s , +15d 59m 00.4s) | P\ | 10 | 12.5 | 152 | 2024-02-29 15:50:38 | MASTER-Amur | (04h 51m 03.22s , +15d 59m 08.6s) | P\ | 30 | 13.2 | 208 | 2024-02-29 15:51:29 | MASTER-Amur | (04h 50m 58.13s , +15d 58m 20.0s) | P\ | 40 | 13.3 | 347 | 2024-02-29 15:53:38 | MASTER-Amur | (04h 51m 04.06s , +15d 58m 24.5s) | P\ | 60 | 13.5 | 384 | 2024-02-29 15:54:10 | MASTER-Kislovodsk | (04h 49m 58.40s , +16d 05m 28.4s) | C | 70 | 12.3 | 384 | 2024-02-29 15:54:10 | MASTER-Kislovodsk | (04h 49m 57.26s , +16d 28m 05.5s) | C | 70 | 12.2 | 437 | 2024-02-29 15:54:58 | MASTER-Amur | (04h 50m 58.04s , +15d 57m 27.0s) | P\ | 80 | 13.1 | 484 | 2024-02-29 15:55:40 | MASTER-Kislovodsk | (04h 49m 59.83s , +16d 04m 33.7s) | C | 90 | 12.2 | 547 | 2024-02-29 15:56:38 | MASTER-Amur | (04h 51m 04.06s , +15d 57m 32.5s) | P\ | 100 | 13.4 | 605 | 2024-02-29 15:57:31 | MASTER-Kislovodsk | (04h 50m 07.85s , +16d 05m 23.7s) | C | 110 | 12.6 | 605 | 2024-02-29 15:57:31 | MASTER-Kislovodsk | (04h 49m 56.44s , +16d 28m 50.3s) | C | 110 | 12.6 | 676 | 2024-02-29 15:58:37 | MASTER-Amur | (04h 51m 01.30s , +15d 59m 11.0s) | P\ | 120 | 13.3 | 750 | 2024-02-29 15:59:41 | MASTER-Kislovodsk | (04h 50m 03.02s , +16d 04m 39.0s) | C | 140 | 13.1 | 831 | 2024-02-29 16:00:57 | MASTER-Amur | (04h 51m 01.22s , +15d 57m 55.9s) | P\ | 150 | 13.5 | 925 | 2024-02-29 16:02:21 | MASTER-Kislovodsk | (04h 49m 59.91s , +16d 06m 09.7s) | C | 170 | 17.5 | 925 | 2024-02-29 16:02:21 | MASTER-Kislovodsk | (04h 49m 51.26s , +16d 29m 07.6s) | C | 170 | 13.1 | 1015 | 2024-02-29 16:03:46 | MASTER-Amur | (04h 51m 04.48s , +15d 59m 42.6s) | P\ | 180 | 13.3 | 1121 | 2024-02-29 16:05:32 | MASTER-Kislovodsk | (04h 50m 02.06s , +16d 04m 42.6s) | C | 180 | 13.3 | 1121 | 2024-02-29 16:05:32 | MASTER-Kislovodsk | (04h 49m 57.74s , +16d 28m 41.8s) | C | 180 | 12.3 | 1215 | 2024-02-29 16:07:06 | MASTER-Amur | (04h 50m 58.60s , +15d 58m 59.5s) | P\ | 180 | 12.8 | 1321 | 2024-02-29 16:08:52 | MASTER-Kislovodsk | (04h 50m 02.11s , +16d 03m 32.3s) | C | 180 | 13.1 | 1321 | 2024-02-29 16:08:52 | MASTER-Kislovodsk | (04h 49m 53.59s , +16d 26m 20.2s) | C | 180 | 13.7 | 1414 | 2024-02-29 16:10:25 | MASTER-Amur | (04h 50m 57.80s , +16d 00m 08.0s) | P\ | 180 | 12.7 | 1420 | 2024-02-29 16:10:31 | MASTER-Tavrida | (04h 46m 38.11s , +15d 36m 25.0s) | C | 180 | 15.0 | 1522 | 2024-02-29 16:12:13 | MASTER-Kislovodsk | (04h 50m 09.16s , +16d 03m 51.4s) | C | 180 | 13.3 | 1522 | 2024-02-29 16:12:13 | MASTER-Kislovodsk | (04h 50m 06.11s , +16d 27m 24.2s) | C | 180 | 13.7 | 1609 | 2024-02-29 16:13:40 | MASTER-Tavrida | (04h 46m 31.62s , +15d 35m 50.3s) | C | 180 | 15.2 | 1722 | 2024-02-29 16:15:33 | MASTER-Kislovodsk | (04h 50m 06.14s , +16d 05m 26.3s) | C | 180 | 13.4 | 1722 | 2024-02-29 16:15:33 | MASTER-Kislovodsk | (04h 49m 54.31s , +16d 28m 55.1s) | C | 180 | 13.8 | 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/35837. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33688] GRB 240225B: Swift ToO observations
by GCN Circulars 29 Feb '24

29 Feb '24

TITLE: GCN CIRCULAR NUMBER: 35836 SUBJECT: GRB 240225B: Swift ToO observations DATE: 24/02/29 15:26:30 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 team: Swift has initiated a ToO observation of the MAXI GRB 240225B. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021682 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the MAXI event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration. Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8). This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/35836. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33687] Konus-Wind detection of GRB 240225B (long)
by GCN Circulars 29 Feb '24

29 Feb '24

TITLE: GCN CIRCULAR NUMBER: 35835 SUBJECT: Konus-Wind detection of GRB 240225B (long) DATE: 24/02/29 14:46:36 GMT FROM: Dmitry Frederiks at Ioffe Institute <fred(a)mail.ioffe.ru> D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: GRB 240225B (MAXI/GCS detection: Nakajima et al., GCN 35796; AstroSat CZTI detection: Joshi al., GCN 35798) triggered Konus-Wind (KW) at T0=72727.251 s UT (20:12:07.251), i.e., ~3.5 min before the MAXI trigger. The burst light curve shows a multi-peaked emission pulse, which starts at ~T0 - 2 s, peaks around ~T0 + 6 s, and has a total duration of ~35 s. The emission is seen up to ~3 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB240225_T72727/ As observed by Konus-Wind, the burst had a fluence of (2.16 ± 0.35)x10^-5 erg/cm^2 and a 64-ms peak energy flux, measured from T0 + 6.144 s, of (2.87 ± 0.41)x10^-6 erg/cm^2/s (both in the 20 keV - 10 MeV energy range). A time-averaged spectrum (measured from T0 to T0+41.216 s) is best fit in the 20 keV - 15 MeV range by a GRB (Band) function with the following model parameters: the low-energy photon index alpha = -1.37 (-0.14,+0.15), the high energy photon index beta = -2.74 (-7.26,+0.43), the peak energy Ep = 270 (-43,+64) keV, chi2 = 107/97 dof. A spectrum near the peak count rate (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 15 MeV range by a GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.85 (-0.110,+0.10), the high energy photon index beta = -2.43 (-0.55,+0.24), the peak energy Ep = 287 (-47,+59) keV, chi2 = 75/79 dof. Assuming the redshift z=0.946 (Schneider et al., GCN 35832) and a standard cosmology with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014), we estimate the burst isotropic energy release E_iso to (5.38 ± 0.95)x10^52 erg, the isotropic peak luminosity L_iso to (1.87 ± 0.27)x10^52 erg/s, the rest-frame peak energy of the time-integrated spectrum Ep,i,z to ~525 keV, and the rest-frame peak energy at the peak of the emission Ep,p,z to ~558 keV. With the obtained estimates, GRB 240225B is inside 68% prediction bands for both 'Amati' and 'Yonetoku' relations derived for the sample of >300 long KW GRBs with known redshifts (Tsvetkova et al., 2017; Tsvetkova et al., 2021), see http://www.ioffe.ru/LEA/GRBs/GRB240225_T72727/GRB240225B_rest_frame.pdf All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary. View this GCN Circular online at https://gcn.nasa.gov/circulars/35835. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33686] GRB 240229A: BALROG localization (Fermi Trigger 730908432 / GRB 240229588)
by GCN Circulars 29 Feb '24

29 Feb '24

TITLE: GCN CIRCULAR NUMBER: 35834 SUBJECT: GRB 240229A: BALROG localization (Fermi Trigger 730908432 / GRB 240229588) DATE: 24/02/29 14:44:04 GMT FROM: Jochen Greiner at MPE <jcgrog(a)mpe.mpg.de> B. Biltzinger, T. Preis, J. Burgess & J. Greiner (all MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 730908432 at 14:07:07 on 29 Feb. 2024 were automatically fitted for spectrum and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427; Berlato et al. 2019, ApJ 873, 60). The best-fit position is: RA(2000.0) = 195.9 deg Decl.(2000.0) = 16.3 deg The 1 sigma statistical error radius is 1.7 deg. We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB240229588/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB240229588/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB240229588/json View this GCN Circular online at https://gcn.nasa.gov/circulars/35834. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33685] GRB 240229A: Fermi GBM Final Real-time Localization
by GCN Circulars 29 Feb '24

29 Feb '24

TITLE: GCN CIRCULAR NUMBER: 35833 SUBJECT: GRB 240229A: Fermi GBM Final Real-time Localization DATE: 24/02/29 14:17:34 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 14:07:07 UT on 29 Feb 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240229A (trigger 730908432.025634 / 240229588). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 199.2, Dec = 16.8 (J2000 degrees, equivalent to J2000 13h 16m, 16d 48'), with a statistical uncertainty of 1.2 degrees. The angle from the Fermi LAT boresight is 85.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240229588/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240229588/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240229588/… View this GCN Circular online at https://gcn.nasa.gov/circulars/35833. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33684] GRB 240225B: VLT/X-shooter redshift
by GCN Circulars 29 Feb '24

29 Feb '24

TITLE: GCN CIRCULAR NUMBER: 35832 SUBJECT: GRB 240225B: VLT/X-shooter redshift DATE: 24/02/29 10:36:12 GMT FROM: Andrea Rossi at INAF <andrea.rossi(a)inaf.it> B. Schneider (MIT), G. Pugliese (API), A. Rossi (INAF/OAS), J. Palmerio (GEPI/Obs. de Paris & IAP), D. B. Malesani (DAWN/NBI and Radboud Univ.), Z. Zhu (NAOC), D. Xu (NAOC), B. P. Gompertz (Birmingham), A. Saccardi (GEPI/Obs. de Paris) report on behalf of the Stargate collaboration: We observed the field of the MAXI/GSC GRB 240225B (Nakajima et al., GCN 35796; see also Joshi et al. 2024, GCN 35798; Kawakubo et al., GCN 35811) using the ESO VLT UT3 (Melipal) equipped with the X-shooter spectrograph. Our spectra cover the wavelength range 3000-21000 AA, and consist of 4 exposures of 1200 s each. The observation mid-time is 02:29:56 UT on 2024 Feb 29 (~3.3 days after the MAXI trigger). In grz images taken with the acquisition camera on Feb 29 01:37:53 UT, we clearly detect the optical afterglow (Gompertz et al., GCN 35805; Liu et al., GCN 35812; Malesani et al., GCN 35819; Wise et al., GCN 35820; Gompertz et al., GCN 35824; Pankov et al., GCN 35826; Moskvitin et al., GCN 35828; Mo et al., GCN 35829; Ror et al., GCN 35830; Sasada et al., GCN 35831), for which we measure a preliminary AB magnitude r ~ 21 (the absolute calibration is uncertain due to the low number of Pan-STARRS calibrators in our small FoV). In a preliminary reduction of the spectra, we clearly detect a continuum over the entire wavelength range. From detection of multiple absorption features, which we interpret as being due to Fe II, Mg II, AlIII, Ca II, and Fe II*, we infer a common redshift of z = 0.946. We conclude this is the redshift of the burst. We also detect emission lines ([O II] and [O III] doublets, and H_alpha) at a consistent redshift, which we interpret as being due to the GRB host galaxy. As noted by Gompertz & Malesani (GCN 35824), the host galaxy is also detected in the Legacy Survey with r ~ 24.2 and a photometric redshift z ~ 0.9, which is consistent with the value we measured. We acknowledge expert support from the ESO staff in Paranal, in particular Francesca Lucertini, Israel Blanchard and Thomas Rivinius. View this GCN Circular online at https://gcn.nasa.gov/circulars/35832. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33683] GRB 240225B : MITSuME Akeno optical afterglow candidate detection
by GCN Circulars 29 Feb '24

29 Feb '24

TITLE: GCN CIRCULAR NUMBER: 35831 SUBJECT: GRB 240225B : MITSuME Akeno optical afterglow candidate detection DATE: 24/02/29 10:30:01 GMT FROM: Mahito Sasada at Tokyo Institute of Technology <sasada(a)hp.phys.titech.ac.jp> M. Sasada, I. Takahashi, M. Niwano, S. Sato, N. Higuchi, S. Hayatsu, H. Takei, H. Seki, Y. Yatsu and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 240225B (Nakajima et al. GCN 35796) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope Akeno. The observation with a series of 60 sec exposures started at 2024-02-27 09:49:24 UT (1.565 days after the MAXI trigger). We stacked the images in good conditions. Here we report the g’- and Rc-band magnitudes of the optical candidate and upper limits by the aperture photometry. T0+[days] | MID-UT | T-EXP[sec] | candidate magnitude and 5-sigma limits ---------------------------------------------------------------------------------------------------------------- 1.638 | 2024-02-27 11:35:11 | 9480 | g’=19.78+/-0.13, Rc=19.53+/-0.10, Ic>19.7 ---------------------------------------------------------------------------------------------------------------- T0+ : Elapsed time after the trigger T-EXP: Total Exposure time The position of the optical candidate is consistent with Gompertz et al., GCN 35805. The obtained magnitudes are broadly consistent with Gompertz et al., GCN 35805; Liu et al., GCN 35812; Malesani et al., GCN 35819; Wise et al., GCN 35820; Gompertz et al., GCN 35824; Pankov et al., GCN 35826; Moskvitin et al., GCN 35828; and Geoffrey et al., GCN 35829; and Ror et al., GCN 35830. We used the PS1 catalog for flux calibration. The catalog magnitudes in PS1 g, r and i bands were converted to our g'-, Rc- and Ic-band magnitudes following Tonry et al. (2012), Table 6. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire). View this GCN Circular online at https://gcn.nasa.gov/circulars/35831. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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