//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31151 SUBJECT: GRB 211130A: Fermi GBM Final Real-time Localization DATE: 21/11/30 15:26:55 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 15:16:27 UT on 30 Nov 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211130A (trigger 659978192.028088 / 211130636). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 18.3, Dec = -24.3 (J2000 degrees, equivalent to J2000 01h 13m, -24d 18'), with a statistical uncertainty of 1.4 degrees. The angle from the Fermi LAT boresight is 72.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_skymap_all_bn211130636.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_healpix_all_bn211130636.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_lc_medres34_bn211130636.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31152 SUBJECT: GRB 211130A: BALROG localization (Fermi Trigger 659978192 / GRB 211130636) DATE: 21/11/30 16:17:17 GMT FROM: Jochen Greiner at MPE,Garching F. Kunzweiler, B. Biltzinger, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 659978192 at 15:16:27 on 30 Nov. 2021 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 (1 sigma statistical errors) is: RA(2000.0) = 18.8+/-3.0 deg Decl.(2000.0) = -28.5+/-3.8 deg We estimate an additional systematic error of 2 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB211130636/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB211130636/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB211130636/json //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31154 SUBJECT: Fermi GRB 211130A: Global MASTER-Net observations report DATE: 21/11/30 17:30:11 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina, A.Chasovnikov, V.Topolev, V.Grinshpun, 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 (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 211130A ( Fermi GBM team, GCN 31151) errorbox 693 sec after notice time and 732 sec after trigger time at 2021-11-30 15:28:39 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 74 deg. The sun altitude is -19.8 deg. The galactic latitude b = -84 deg., longitude l = 185 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1800540 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 802 | 2021-11-30 15:28:39 | MASTER-Kislovodsk | (01h 12m 10.65s , -24d 10m 36.9s) | P- | 140 | 15.5 | 802 | 2021-11-30 15:28:39 | MASTER-Kislovodsk | (01h 12m 21.91s , -24d 33m 47.5s) | C | 140 | 13.6 | 983 | 2021-11-30 15:31:19 | MASTER-Kislovodsk | (01h 12m 07.92s , -24d 09m 06.7s) | P- | 180 | 16.8 | 983 | 2021-11-30 15:31:19 | MASTER-Kislovodsk | (01h 12m 25.40s , -24d 32m 24.1s) | C | 180 | 13.2 | 1183 | 2021-11-30 15:34:40 | MASTER-Kislovodsk | (01h 12m 08.03s , -24d 10m 12.7s) | P- | 180 | 16.5 | 1183 | 2021-11-30 15:34:40 | MASTER-Kislovodsk | (01h 12m 20.64s , -24d 33m 26.8s) | C | 180 | 12.8 | 1384 | 2021-11-30 15:38:00 | MASTER-Kislovodsk | (01h 12m 10.08s , -24d 08m 56.4s) | P- | 180 | 16.6 | 1564 | 2021-11-30 15:38:00 | MASTER-Kislovodsk | (01h 12m 10.08s , -24d 08m 56.4s) | P- | 540 | 17.5 | Coadd 1384 | 2021-11-30 15:38:00 | MASTER-Kislovodsk | (01h 12m 22.20s , -24d 32m 06.5s) | C | 180 | 13.5 | 1584 | 2021-11-30 15:41:21 | MASTER-Kislovodsk | (01h 12m 04.09s , -24d 09m 34.1s) | P- | 180 | 17.0 | 1584 | 2021-11-30 15:41:21 | MASTER-Kislovodsk | (01h 12m 16.60s , -24d 32m 42.7s) | C | 180 | 13.7 | 1784 | 2021-11-30 15:44:41 | MASTER-Kislovodsk | (01h 12m 05.14s , -24d 08m 31.6s) | P- | 180 | 17.1 | 1785 | 2021-11-30 15:44:41 | MASTER-Kislovodsk | (01h 12m 18.01s , -24d 31m 39.2s) | C | 180 | 15.0 | 6472 | 2021-11-30 17:03:49 | MASTER-Kislovodsk | (01h 22m 39.34s , -25d 13m 11.6s) | C | 60 | 12.8 | 6793 | 2021-11-30 17:09:10 | MASTER-Kislovodsk | (01h 04m 47.15s , -23d 20m 56.2s) | C | 60 | 15.2 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31161 SUBJECT: IPN triangulation of GRB 211130A DATE: 21/12/03 14:20:30 GMT FROM: Anna Ridnaia at Ioffe Institute A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the MGNS/BepiColombo and HEND/Mars Odyssey teams, J. Benkhoff on behalf of the BepiColombo team, A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, K. Hurley, on behalf of the IPN, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team, report: The long-duration GRB 211130A (Fermi GBM Final Real-time localization: The Fermi GBM team, GCN 31151; BALROG localization: Kunzweiler et al., GCN 31152) was detected by Fermi (GBM trigger 659978192), Konus-Wind, INTEGRAL (SPI-ACS), and BepiColombo (MGNS) at about 54987 s UT (15:16:27). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 21.148 (01h 24m 35s) -27.829 (-27d 49' 46") Corners: 20.183 (01h 20m 44s) -27.190 (-27d 11' 25") 20.317 (01h 21m 16s) -27.403 (-27d 24' 10") 22.106 (01h 28m 25s) -28.433 (-28d 25' 58") 21.973 (01h 27m 54s) -28.233 (-28d 13' 58") --------------------------------------------- The error box area is 734 sq. arcmin, and its maximum dimension is 2.1 deg (the minimum one is 6.5 arcmin). The Sun distance was 113 deg. This box may be improved. The IPN localization is consistent with, but reduces the area of, the Fermi final position and BALROG localizations. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB211130_T54992/IPN The time history and spectrum will be given in forthcoming GCN Circulars. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31162 SUBJECT: Konus-Wind detection of GRB 211130A DATE: 21/12/03 17:19:17 GMT FROM: Anna Ridnaia at Ioffe Institute A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline on behalf of the Konus-Wind team, report: The long-duration GRB 211130A (Fermi GBM Final Real-time localization: The Fermi GBM team, GCN 31151; BALROG localization: Kunzweiler et al., GCN 31152; IPN triangulation: Kozyrev et al., GCN 31161) triggered Konus-Wind at T0=54992.505 s UT (15:16:32.505). The burst light curve starts with a smooth pulse, which was followed, after a period of low-level emission, by a more intense, multi-peaked emission complex. The total burst duration is ~21.4 s. The emission is seen up to ~6 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB211130_T54992/ As observed by Konus-Wind, the burst had a fluence of 9.57(-0.68,+0.75)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+13.456 s, of 8.39(-2.23,+2.99)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+16.640 s) is best fit in the 20 keV - 6 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.54(-0.24,+0.27) and Ep = 164(-15,+19) keV (chi2 = 82/75 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.5 (chi2 = 82/74). The spectrum near the maximum count rate (measured from T0+8.448 to T0+16.640 s) is best fit in the 20 keV - 6 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.40(-0.34,+0.47), the high energy photon index beta = -2.69(-1.55,+0.43), the peak energy Ep = 177(-31,+34) keV (chi2 = 56/73 dof). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31196 SUBJECT: GRB 211130A: MeerLICHT identification of possible afterglow candidate DATE: 21/12/10 09:16:11 GMT FROM: Simon de Wet at UCT S. de Wet (UCT), P.J. Groot (Radboud/UCT/SAAO), A.J. Levan (Radboud), P.M. Vreeswijk (Radboud), report on behalf of the MeerLICHT consortium: We observed the field of the Fermi/GBM long GRB candidate GRB 211130A (Fermi GBM Team, GCN 31151) with the 0.6m wide-field MeerLICHT optical telescope located at Sutherland, South Africa, starting at 2021-11-30, 18:31:26 UT, approximately 3 hours 15 minutes after the GRB trigger. With a field of view of 2.7 square degrees, 72 MeerLICHT pointings were required to cover the GBM sky map to a probability level of 90%. We observed 67 out of the 72 fields three times on the first night of observations. The remaining 5 fields were observed once. All observations were conducted in the q-band (g+r) with a 60s exposure time. The average 5-sigma full-frame limiting magnitude was q = 20.79 across the observations. Following the IPN triangulation of GRB 211130A (Kozyrev et al., GCN 31161), a refined search for transient candidates in our data reveals a single promising afterglow candidate at coordinates: RA (J2000) = 01:24:52.46 (21.2186d) Dec (J2000) = -27:41:57.48 (-27.6993d) calibrated against Gaia DR2. The candidate is, however, located just North of the IPN triangulation region, an angular distance of 8.7' from the centre of the IPN region and still consistent with the Konus-Wind/GBM triangulation region. The candidate was detected at three epochs and appears to show fading behaviour, with 5-sigma AB magnitudes at time post-trigger of: q = 19.83 +/- 0.07 at 3.74 hours q = 20.05 +/- 0.10 at 5.57 hours q = 20.66 +/- 0.20 at 7.05 hours. No underlying source is visible in PanSTARRS and Legacy Survey DR9 images at this position. MeerLICHT is built and run by a consortium consisting of Radboud University, University of Cape Town, the South African Astronomical Observatory, the University of Oxford, the University of Manchester and the University of Amsterdam.