//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29380 SUBJECT: GRB 210202A: Fermi GBM Final Real-time Localization DATE: 21/02/02 20:20:52 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 20:10:31 UT on 2 Feb 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210202A (trigger 633989436.299376 / 210202841). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 232.2, Dec = -40.4 (J2000 degrees, equivalent to J2000 15h 28m, -40d 23'), with a statistical uncertainty of 1.7 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/2021/bn210202841/quicklook/glg_skymap_all_bn210202841.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/bn210202841/quicklook/glg_healpix_all_bn210202841.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210202841/quicklook/glg_lc_medres34_bn210202841.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29382 SUBJECT: GRB 210202A: BALROG localization (Fermi Trigger / GRB 210202841) DATE: 21/02/02 21:25:11 GMT FROM: Jochen Greiner at MPE,Garching B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger at 20:10:31 on 02 Feb. 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) = 223.5+/-1.5 deg Decl.(2000.0) = -35.5+/-1.0 deg We estimate an additional systematic error of 2 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB210202841/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB210202841/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB210202841/json //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29385 SUBJECT: Fermi GRB 210202A: Global MASTER-Net observations report DATE: 21/02/03 03:30:15 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, 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, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University) MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 210202A ( Fermi GBM team, GCN 29380) errorbox 10111 sec after notice time and 10140 sec after trigger time at 2021-02-02 22:59:31 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 71 deg. The sun altitude is -41.4 deg. The galactic latitude b = 13 deg., longitude l = 333 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1538815 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 10170 | 2021-02-02 22:59:31 | MASTER-SAAO | (15h 23m 17.00s , -42d 01m 04.8s) | C | 60 | 17.7 | 10420 | 2021-02-02 23:03:41 | MASTER-SAAO | (15h 16m 27.32s , -40d 00m 25.3s) | C | 60 | 18.0 | 10505 | 2021-02-02 23:05:06 | MASTER-SAAO | (15h 37m 27.39s , -40d 00m 36.0s) | C | 60 | 17.4 | 10585 | 2021-02-02 23:06:26 | MASTER-SAAO | (15h 31m 36.94s , -38d 01m 28.8s) | C | 60 | 17.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29386 SUBJECT: GRB 210202A: Fermi-LAT detection DATE: 21/02/03 05:58:46 GMT FROM: Rachel Hamburg at UAH R. Hamburg (UAH), M. Axelsson (KTH & Stockholm Univ.), M. Arimoto (Kanazawa Univ.), and R. Pillera (Politecnico and INFN Bari) report on behalf of the Fermi-LAT team: On February 2, 2021, Fermi-LAT detected high-energy emission from GRB 210202A, which was also detected by Fermi-GBM (trigger 633989436 / 210202841, GCN 29380). The best LAT on-ground location is found to be RA, Dec = 230.0, -38.0 (J2000) with an error radius of 0.7 deg (90 % containment, statistical error only). This was 45 deg from the LAT boresight at the time of the GBM trigger: T0 = 20:10:31.3 UT. The data from the Fermi-LAT show a significant increase in the event rate after the GBM trigger that is spatially and temporally correlated with the GBM emission (3 degrees from the GBM location) with high significance. The photon flux above 100 MeV in the time interval 0-100s after the GBM trigger is (2.3 +/- 0.9)e-05 ph/cm2/s, while the flux above 1 GeV is (2.7 +/- 1.6)e-06 ph/cm2/s. The estimated photon index above 100 MeV is -1.9 +/- 0.3. The highest-energy photon is a 1.4 GeV event which is observed 19 seconds after the GBM trigger. A Swift ToO has been requested for this burst. The Fermi-LAT point of contact for this burst is Rachel Hamburg ( rkh0007@uah.edu). The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29387 SUBJECT: GRB 210202A: Fermi GBM detection DATE: 21/02/03 16:34:35 GMT FROM: Rachel Hamburg at UAH C. Fletcher (USRA), B. Hristov (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: At 20:10:31.30 UT on 02 February 2021, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 210202A (trigger 633989436 / 210202841). There was also a Fermi/LAT ground detection (R. Hamburg et al., GCN 29386). The Fermi GBM Final Real-time Localization was reported in GCN 29380. It is consistent with the Fermi/LAT human-generated position. The angle from the Fermi LAT boresight at the GBM trigger time is 45 degrees. The GBM light curve consists of multiple peaks with a duration (T90) of about 18 s (50-300 keV). The time-averaged spectrum from T0+0.003 s to T0+18.7 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.71 +/- 0.03 and the cutoff energy, parameterized as Epeak, is 297 +/- 12 keV. The spectrum is also well fit by a Band function with Epeak = 265 +/- 16 keV, alpha = -0.66 +/- 0.04, and beta = -2.5 +/- 0.2. The event fluence (10-1000 keV) in this time interval is (1.670 +/- 0.036)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.5 s in the 10-1000 keV band is 16 +/- 2 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/" //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29389 SUBJECT: GRB 210202A: AGILE/MCAL detection DATE: 21/02/03 18:36:16 GMT FROM: Alessandro Ursi at INAF/IAPS A. Ursi, M. Cardillo (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, C. Casentini, Y. Evangelista, G. Piano (INAF/IAPS), F. Lucarelli, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team: The AGILE Mini-CALorimeter (MCAL) detected GRB 210202A at T0 = 2021-02-02 20:10:32.98 +/- 0.01 s (UTC), reported by Fermi/GBM (GCN #29380, #29387) and Fermi/LAT (GCN #29386). The event lasted about 2.5 s and released a total number of ~2000 counts in the detector (in the 0.4-100 MeV energy range), above an average background rate of 570 Hz. The light curve shows a single peak and can be found at http://www.agilescienceapp.it/notices/GRB210202A_AGILE_MCAL.png . The time-integrated spectrum of the burst can be fitted in the energy range 0.4-10 MeV with a single power-law with ph.ind. = -3.01 -0.52/+0.84, resulting in a reduced chi-squared of 0.90 (48 d.o.f.) and a fluence of 2.8e-06 ergs/cm^2 (90% confidence level), in the same energy range. The event is also clearly visible in the scientific ratemeters of the SuperAGILE (SA; 18-60 keV), MiniCALorimeter (MCAL; 0.4-100 MeV), and AntiCoincidence (AC; 50-200 keV) detectors. The burst released 340 counts in the SA detector (above a background rate of 100 Hz), 4580 counts in the MCAL detector (above a background rate of 1260 Hz), and 12340 counts in the AC detector (above a background rate of 3700 Hz). The AGILE ratemeters light curves can be found at: http://www.agilescienceapp.it/notices/GRB210202A_AGILE_RM.png . The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress. This GRB event did not generate an automatic alert notice. Automatic MCAL GRB alert Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html .