//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31740 SUBJECT: GRB 220311A: Fermi GBM Final Real-time Localization DATE: 22/03/11 16:43:54 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 16:33:18 UT on 11 Mar 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220311A (trigger 668709203.400826 / 220311690). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 131.1, Dec = 55.0 (J2000 degrees, equivalent to J2000 08h 44m, 55d 00'), with a statistical uncertainty of 18.6 degrees. The angle from the Fermi LAT boresight is 111.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220311690/quicklook/glg_skymap_all_bn220311690.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/bn220311690/quicklook/glg_healpix_all_bn220311690.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220311690/quicklook/glg_lc_medres34_bn220311690.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31741 SUBJECT: Integral GRB220311.69: Global MASTER-Net OT detection DATE: 22/03/11 16:45:26 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, F. Balakin, I. Gorbunov Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) Hugo Levato Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory 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 GRB220311.69 25 sec after notice time and 53 sec after trigger time at 2022-03-11 16:34:45 UT. On our first (10s exposure) set we found 1 optical transient within Integral error-box (ra=184.033 dec=66.7611 r=0.054167) brighter than 14.0. T-Tmid Date Time Expt. Ra Dec Mag ---------|---------------------|-------|-----------------|-----------------|------- 58 2022-03-11 16:34:45 10 (12h 16m 05.22s , +66d 47m 23.8s) 13.5 The 5-sigma upper limit has been about 14.0mag The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31742 SUBJECT: Integral GRB220311.69: Global MASTER-Net observations report DATE: 22/03/11 16:57:12 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-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 Integral GRB220311.69 (trigger No 9769,10h 32m 03.74s , +66d 04m 03.8s, R=0.0516667) errorbox 15 sec after notice time and 30 sec after trigger time at 2022-03-11 16:33:46 UT, with upper limit up to 16.4 mag. The observations began at zenith distance = 21 deg. The sun altitude is -42.3 deg. MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Integral GRB220311.69 errorbox 195 sec after notice time and 210 sec after trigger time at 2022-03-11 16:36:46 UT, with upper limit up to 16.1 mag. Observations started at twilight. The observations began at zenith distance = 41 deg. The sun altitude is -10.4 deg. The galactic latitude b = 46 deg., longitude l = 142 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1907358 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 36 | MASTER-Amur | P\ | 10 | 14.4 | 65 | MASTER-Amur | P\ | 10 | 14.5 | 230 | MASTER-Amur | P\ | 40 | 15.6 | 231 | MASTER-Tavrida | P\ | 40 | 15.0 | 294 | MASTER-Amur | P\ | 50 | 15.0 | 295 | MASTER-Tavrida | P\ | 50 | 14.9 | 374 | MASTER-Amur | P\ | 70 | 15.5 | 369 | MASTER-Tavrida | P\ | 60 | 14.5 | 459 | MASTER-Tavrida | P\ | 80 | 15.5 | 468 | MASTER-Amur | P\ | 80 | 15.5 | 568 | MASTER-Tavrida | P\ | 100 | 15.1 | 578 | MASTER-Amur | P\ | 100 | 15.7 | 698 | MASTER-Tavrida | P\ | 120 | 16.1 | 712 | MASTER-Amur | P\ | 130 | 15.7 | 893 | MASTER-Amur | P\ | 160 | 16.3 | 1083 | MASTER-Amur | P\ | 180 | 16.4 | The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31743 SUBJECT: Integral GRB220311.69: Global MASTER-Net observations report DATE: 22/03/11 16:57:18 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-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 Integral GRB220311.69 (trigger No 75305,12h 16m 08.21s , +66d 45m 39.6s, R=0.0542) errorbox 45 sec after notice time and 53 sec after trigger time at 2022-03-11 16:34:45 UT, with upper limit up to 14.5 mag. The observations began at zenith distance = 16 deg. The sun altitude is -42.3 deg. The galactic latitude b = 50 deg., longitude l = 128 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1907372 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 59 | MASTER-Amur | P\ | 10 | 14.5 | 94 | MASTER-Amur | P\ | 20 | 14.1 | 134 | MASTER-Amur | P\ | 20 | 14.1 | The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31744 SUBJECT: GRB 220311A: A long GRB detected by INTEGRAL DATE: 22/03/11 17:24:07 GMT FROM: Sandro Mereghetti at IASF-Milano/INAF S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report: a gamma ray burst lasting about 20 s has been detected by IBAS in the IBIS/ISGRI data at 16:33:10 UT of March 11, 2022. The refined coordinates (J2000) are: R.A.= 157.9747 deg DEC.= +66.0819 deg with an uncertainty of 3 arcmin (90% c.l.). The burst had a peak flux of 0.3 ph/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 2e-7 erg/cmq. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html -- //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31745 SUBJECT: GRB 220311A: MASTER OT retraction DATE: 22/03/11 19:50:59 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov (Lomonosov MSU) The published OT candidate (GCN Circ 31741) is the noise inside the errorbox of one of the invalid triggers. I'm sorry for the problems. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31757 SUBJECT: GRB 220311A: MITSuME Akeno optical upper limits DATE: 22/03/15 02:22:55 GMT FROM: Ryohei Hosokawa at Tokyo Institute of Technology R. Hosokawa, Y. Imai, R. Yamaguchi, K. L. Murata, M. Niwano, N. Ito, Y. Takamatsu, R. Noto, S. Sato, M. Takaku, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 220311A (The Fermi GBM team GCN Circular #31740, V. Yurkov et al. GCN Circular #31741, V. Lipunov et al. GCN Circular #31742, V. Lipunov et al. GCN Circular #31743, S.Mereghetti et al. GCN Circular #31744, V. Lipunov et al. GCN Circular #31745) 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 2022-03-11 16:44:51 UT (11.7 minutes after IBAS trigger). We stacked the images with good conditions. We did not detect any uncatalogued sources within the IBAS error region (S.Mereghetti et al. GCN Circular #31744). We obtained the 5-sigma limits of the stacked images as follows. T0+[min] MID-UT T-EXP[sec] 5-sigma limits ------------------------------------------------------------------------------------------------ 29.0 2022-03-11 17:02:10 1440 g'>19.8, Rc>19.8, Ic>19.0 ------------------------------------------------------------------------------------------------ T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used PS1 catalog for flux calibration. 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). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31760 SUBJECT: GRB 220311A: Fermi GBM observation DATE: 22/03/15 14:57:05 GMT FROM: Rachel Hamburg at UAH R. Hamburg (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 16:33:18.40 UT on 11 March 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 220311A (trigger 668709203 / 220311690), which was also detected by the INTEGRAL/IBAS (Mereghetti et al. 2022, GCN 31740). The Fermi GBM Final Real-time Localization (GCN 31744) is largely consistent with the INTEGRAL position. The angle from the Fermi LAT boresight at the GBM trigger time is 111 degrees. The GBM light curve shows a single spike with a duration (T90) of about 10 s (50-300 keV). The time-averaged spectrum from T0-5.1 s to T0+0.0 s is adequately a simple power law function with index -1.55 +/- 0.11. The event fluence (10-1000 keV) in this time interval is (1.8 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-4.7 s in the 10-1000 keV band is 1.8 +/- 0.3 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/"