//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33054 SUBJECT: GRB 221215A: Fermi GBM Final Real-time Localization DATE: 22/12/15 04:25:46 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 04:14:27 UT on 15 Dec 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 221215A (trigger 692770472.974848 / 221215177). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 156.1, Dec = 38.6 (J2000 degrees, equivalent to J2000 10h 24m, 38d 36'), with a statistical uncertainty of 13.6 degrees. The angle from the Fermi LAT boresight is 45.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221215177/quicklook/glg_skymap_all_bn221215177.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221215177/quicklook/glg_healpix_all_bn221215177.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221215177/quicklook/glg_lc_medres34_bn221215177.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33056 SUBJECT: Swift GRB221215.15: Global MASTER-Net observations report DATE: 22/12/15 15:50:31 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, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (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), 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), 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) was pointed to the Swift GRB221215.15 (trigger No 1144538,03h 39m 09.36s , -27d 25m 58.8s, R=0.05) errorbox 43602 sec after notice time and 43632 sec after trigger time at 2022-12-15 15:42:37 UT, with upper limit up to 16.5 mag. The observations began at zenith distance = 85 deg. The sun altitude is -22.2 deg. The galactic latitude b = -52 deg., longitude l = 223 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2184393 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 43723 | MASTER-Kislovodsk | C | 180 | 16.5 | 43723 | MASTER-Kislovodsk | C | 180 | 16.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33062 SUBJECT: GRB 221215A: Swift/BAT-GUANO arcminute localization DATE: 22/12/16 05:48:32 GMT FROM: Aaron Tohuvavohu at U Toronto James DeLaunay (UAlabama), Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), Jamie A. Kennea (PSU) report: Swift/BAT did not localize GRB 221215A onboard (T0: 2022-12-15T04:14:27 UTC, Fermi/GBM GCN 33054). The Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1). Upon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground. The BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu, arXiv:2111.01769), detects the burst in a 4.096 s analysis time bin with a sqrt(TS) of 11.8. An arcminute localization is found with DeltaLLHOut of 19.7 and a DeltaLLHPeak of 7.3. Cross-correlation imaging also finds this source with SNR 5.5. See Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretations of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut. The BAT position is RA, Dec = 155.056, +46.873 deg which is RA(J2000) = 10h 20m 13.34s Dec(J2000) = +46d 52′ 21.7″ with an estimated uncertainty of 3 arcmin radius. XRT and UVOT follow-up has been requested. Results of follow-up observations will be reported in future circulars. GUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches. A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33063 SUBJECT: GRB 221215A: Swift ToO observations DATE: 22/12/16 07:17:07 GMT FROM: Phil Evans at U of Leicester P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the Swift/BAT-GUANO GRB 221215A. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021533 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 Swift/BAT-GUANO 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33072 SUBJECT: GRB 221215A: Swift-XRT observations DATE: 22/12/16 15:41:34 GMT FROM: Phil Evans at U of Leicester K.L. Page (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), J. D. Gropp (PSU), S. Dichiara (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Swift/BAT-GUANO-detected burst GRB 221215A, collecting 2.8 ks of Photon Counting (PC) mode data between T0+97.3 ks and T0+113.8 ks. No X-ray sources have been detected consistent with being within 296 arcsec of the Swift/BAT-GUANO position. The 3-sigma upper limit in the field is 0.005 ct s^-1, corresponding to a 0.3-10 keV observed flux of 1.9e-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum). An uncatalogued was detected, however this was too far from the GRB position to be the afterglow. The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/00021533. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33083 SUBJECT: GRB 221215A: Fermi GBM Detection DATE: 22/12/19 15:24:17 GMT FROM: Oliver J Roberts at USRA/NASA O.J. Roberts (USRA/NASA), J. Wood (NASA) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 04:14:27.97 UT on 15 December 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 221215A (trigger 692770472 / 221215177) which was also detected by the Swift/BAT GUANO (DeLaunay et al. 2022, GCN 33062) The Fermi GBM Final Real-time Localization (GCN 33054) is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 53 degrees. The GBM light curve shows a FRED-like pulse with a duration (T90) of about 14 s (50-300 keV). The time-averaged spectrum from T0-2 s to T0+12 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is 1.6 +/- 1.3 and the cutoff energy, parameterized as Epeak, is 165 +/- 26 keV The event fluence (10-1000 keV) in this time interval is (6.8 +/- 1.2)E-07 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.7 s in the 10-1000 keV band is 29.8 +/- 9.4 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/"