//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31630 SUBJECT: GRB 220222A: Fermi GBM Final Real-time Localization DATE: 22/02/22 02:31:50 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 02:21:17 UT on 22 Feb 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220222A (trigger 667189282.835626 / 220222098). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 27.1, Dec = -8.0 (J2000 degrees, equivalent to J2000 01h 48m, -8d 00'), with a statistical uncertainty of 2.3 degrees. The angle from the Fermi LAT boresight is 59.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220222098/quicklook/glg_skymap_all_bn220222098.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/bn220222098/quicklook/glg_healpix_all_bn220222098.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220222098/quicklook/glg_lc_medres34_bn220222098.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31631 SUBJECT: Fermi GRB 220222A: Global MASTER-Net observations report DATE: 22/02/22 04:30:19 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), B.L.Carrasco, J.R.Valdes,V.Chavushyan, C.J.Martinez, V.M.Patino Alvarez, M.L.H.Rodriguez (INAOE, OAGH) A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-OAGH robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the Fermi GRB 220222A ( Fermi GBM team, GCN 31630) errorbox 697 sec after notice time and 725 sec after trigger time at 2022-02-22 02:33:23 UT, with upper limit up to 17.8 mag. The observations began at zenith distance = 65 deg. The sun altitude is -18.3 deg. The galactic latitude b = -66 deg., longitude l = 162 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1891006 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 801 | 2022-02-22 02:33:23 | MASTER-OAGH | (01h 45m 29.04s , -07d 51m 52.8s) | C | 150 | 15.9 | 801 | 2022-02-22 02:33:23 | MASTER-OAGH | (01h 44m 58.42s , -07d 24m 02.1s) | C | 150 | 16.7 | 1127 | 2022-02-22 02:38:34 | MASTER-OAGH | (01h 44m 57.56s , -07d 23m 01.8s) | C | 180 | 16.5 | 1127 | 2022-02-22 02:38:34 | MASTER-OAGH | (01h 45m 28.44s , -07d 50m 51.4s) | C | 180 | 15.5 | 1469 | 2022-02-22 02:44:16 | MASTER-OAGH | (01h 45m 36.17s , -07d 51m 45.0s) | C | 180 | 15.8 | 1469 | 2022-02-22 02:44:16 | MASTER-OAGH | (01h 45m 05.23s , -07d 24m 01.9s) | C | 180 | 17.0 | 1809 | 2022-02-22 02:49:57 | MASTER-OAGH | (01h 45m 29.37s , -07d 52m 46.6s) | C | 180 | 16.2 | 1809 | 2022-02-22 02:49:57 | MASTER-OAGH | (01h 44m 58.02s , -07d 25m 04.6s) | C | 180 | 17.2 | 2175 | 2022-02-22 02:57:02 | MASTER-OAGH | (01h 44m 51.39s , -08d 06m 51.2s) | C | 60 | 16.8 | 2175 | 2022-02-22 02:57:02 | MASTER-OAGH | (01h 44m 19.36s , -07d 39m 10.7s) | C | 60 | 17.8 | 2396 | 2022-02-22 03:00:43 | MASTER-OAGH | (01h 44m 23.89s , -06d 14m 09.8s) | C | 60 | 16.2 | 2396 | 2022-02-22 03:00:43 | MASTER-OAGH | (01h 43m 51.99s , -05d 46m 32.2s) | C | 60 | 17.4 | 2624 | 2022-02-22 03:04:31 | MASTER-OAGH | (01h 45m 29.85s , -10d 00m 32.3s) | C | 60 | 16.0 | 2624 | 2022-02-22 03:04:31 | MASTER-OAGH | (01h 44m 56.85s , -09d 32m 54.9s) | C | 60 | 17.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31633 SUBJECT: GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV DATE: 22/02/22 14:18:17 GMT FROM: Aaron Tohuvavohu at U Toronto Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), James DeLaunay (UAlabama), Jamie A. Kennea (PSU), report: Swift/BAT did not localize GRB 220222A onboard (T0: 2022-02-22T02:21:17 UTC, Fermi/GBM GCN 31630, CALET trigger #1329531683). The Fermi and CALET notices, 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 with a sqrt(TS) of 17.2 in a 2.048 s analysis time bin. The observed duration of the burst is ~5 s. NITRATES results are consistent with a burst coming from outside the coded FOV, with DeltaLLHOut of -7. The best fit out of FoV location is consistent with the Fermi/GBM localization (GCN 31630). See Section 9.1 and Figure 20 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut. 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: 31645 SUBJECT: GCN Circ.draft on GRB 220222A DATE: 22/02/24 16:15:25 GMT FROM: Anna Ridnaia at Ioffe Institute Dear colleagues, Find below a draft of our GCN on GRB 220222A. Best regards, Anna IPN triangulation of GRB 220222A A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars-Odyssey team, A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team, S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report: The long-duration GRB 220222A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 31630; Swift/BAT-GUANO detection: Tohuvavohu et al., GCN Circ. 31633) has been detected by Fermi (GBM trigger 667189282), Konus-Wind, Swift (BAT), and Mars-Odyssey (HEND), so far, at about 8477 s UT (02:21:17). The burst was outside the coded field of view of the BAT. We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 32.630 (02h 10m 31s) -14.008 (-14d 00' 31") Corners: 38.241 (02h 32m 58s) -24.843 (-24d 50' 33") 38.323 (02h 33m 18s) -25.232 (-25d 13' 56") 24.966 (01h 39m 52s) +3.526 ( +3d 31' 33") 24.595 (01h 38m 23s) +4.715 ( +4d 42' 55") --------------------------------------------- The error box area is 3.6 sq. deg, and its maximum dimension is 32.8 deg (the minimum one is 6.7 arcmin). The Sun distance was 51 deg. This box may be improved. The IPN localization is consistent with, but reduces the area of, the Fermi GBM Final Real-time localization (GCN Circ. 31630). A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB220222_T08477/IPN/ The time history and spectrum will be given in forthcoming GCN Circulars. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31649 SUBJECT: IPN triangulation of GRB 220222A DATE: 22/02/25 12:51:38 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 HEND/Mars-Odyssey team, A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team, S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report: The long-duration GRB 220222A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 31630; Swift/BAT-GUANO detection: Tohuvavohu et al., GCN Circ. 31633) has been detected by Fermi (GBM trigger 667189282), Konus-Wind, Swift (BAT), and Mars-Odyssey (HEND), so far, at about 8477 s UT (02:21:17). The burst was outside the coded field of view of the BAT. We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 32.630 (02h 10m 31s) -14.008 (-14d 00' 31") Corners: 38.241 (02h 32m 58s) -24.843 (-24d 50' 33") 38.323 (02h 33m 18s) -25.232 (-25d 13' 56") 24.966 (01h 39m 52s) +3.526 ( +3d 31' 33") 24.595 (01h 38m 23s) +4.715 ( +4d 42' 55") --------------------------------------------- The error box area is 3.6 sq. deg, and its maximum dimension is 32.8 deg (the minimum one is 6.7 arcmin). The Sun distance was 51 deg. This box may be improved. The IPN localization is consistent with, but reduces the area of, the Fermi GBM Final Real-time localization (GCN Circ. 31630). A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB220222_T08477/IPN/ The time history and spectrum will be given in forthcoming GCN Circulars. This GCN is the corrected version of GCN 31645. We apologize for any confusion this may have caused. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31657 SUBJECT: Konus-Wind detection of GRB 220222A DATE: 22/02/28 18:52:36 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration GRB 220222A (Fermi-GBM detection: The Fermi GBM team, GCN 31630; Swift/BAT-GUANO detection: Tohuvavohu et al., GCN 31633; IPN localization: Kozyrev et al., GCN 31649) triggered Konus-Wind (KW) at T0=8476.873 s UT (02:21:16.873). The burst light curve shows a FRED-like pulse which starts at ~T0-0.5 s, peaks at ~T0, and has the total duration of ~5.0 s. Also, a short pulse is seen the KW light curve at ~T0+7.1 s. The emission is seen up to ~1 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB220222_T08477/ As observed by Konus-Wind, the burst had a fluence of (3.6 ± 0.6)x10^-6 erg/cm^2 and a 64-ms peak energy flux, measured from T0-0.064, of (2.0 ± 0.3)x10^-6 erg/cm^2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum of the burst (measured from T0 to T0+8.448 s) is adequately fit in the 20 keV - 1.5 MeV range by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.60(-0.47,+0.60) and Ep = 187(-35,+63) keV (chi2 = 92/60 dof). Fitting this spectrum by a Band function yields the same alpha and Ep, and an upper limit on the high energy photon index beta of -2.3 (chi2 = 93/59 dof). All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31663 SUBJECT: GRB 220222A: CALET Gamma-Ray Burst Monitor detection DATE: 22/03/02 09:09:24 GMT FROM: Valentin Pal'shin at AGU S. Ricciarini (U of Florence), A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), P. S. Marrocchesi (U of Siena), and the CALET collaboration: The GRB 220222A (Fermi GBM Final Real-time Localization: Fermi GBM team, GCN Circ. 31630; Swift/BAT-GUANO detection: Tohuvavohu et al., GCN Circ. 31633; IPN triangulation: Kozyrev et al., GCN Circ. 31649; Konus-Wind detection: Frederiks et al., GCN Circ. 31657; https://gcn.gsfc.nasa.gov/other/220222A.gcn3) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 02:21:16.664 UTC on 22 February 2022 (http://cgbm.calet.jp/cgbm_trigger/flight/1329531683/index.html). The burst signal was seen only by the SGM detector. The burst light curve shows a single weak pulse which starts at T+1.3 sec, peaks at T+2.4 sec,and ends at T+3.0 sec. The T90 and T50 durations measured by the SGM data are 1.5 +- 0.4 sec and 0.6 +- 0.5 sec (40-1000 keV), respectively. The ground processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1329531683/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.