//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30398 SUBJECT: Integral GRB210707.02: Global MASTER-Net observations report DATE: 21/07/07 00:57:09 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) was pointed to the Integral GRB210707.02 (trigger No 9295,19h 34m 53.86s , +21d 53m 33.3s, R=0.0521667) errorbox 22 sec after trigger time at 2021-07-07 00:33:55 UT, with upper limit up to 19.3 mag. The observations began at zenith distance = 57 deg. The sun altitude is -63.9 deg. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Integral GRB210707.02 errorbox 56 sec after trigger time at 2021-07-07 00:34:29 UT, with upper limit up to 15.2 mag. Observations started at twilight. The observations began at zenith distance = 40 deg. The sun altitude is -10.0 deg. MASTER-IAC robotic telescope located in Spain (IAC Teide Observatory) was pointed to the Integral GRB210707.02 errorbox 57 sec after trigger time at 2021-07-07 00:34:29 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 15 deg. The sun altitude is -38.8 deg. The galactic latitude b = 0 deg., longitude l = 58 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1654824 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 28 | MASTER-SAAO | P\ | 10 | 17.4 | 38 | MASTER-SAAO | P\ | 30 | 18.1 | Coadd 49 | MASTER-SAAO | P\ | 10 | 17.5 | 62 | MASTER-Kislovodsk | P| | 10 | 13.2 | 62 | MASTER-IAC | P| | 10 | 16.8 | 62 | MASTER-IAC | P- | 10 | 16.6 | 71 | MASTER-SAAO | P\ | 10 | 17.5 | 89 | MASTER-IAC | P| | 20 | 17.4 | 89 | MASTER-IAC | P- | 20 | 17.1 | 98 | MASTER-Kislovodsk | P| | 20 | 13.1 | 99 | MASTER-SAAO | P\ | 20 | 18.0 | 124 | MASTER-SAAO | P\ | 70 | 18.7 | Coadd 121 | MASTER-IAC | P| | 20 | 17.3 | 121 | MASTER-IAC | P- | 20 | 17.1 | 131 | MASTER-SAAO | P\ | 20 | 18.0 | 143 | MASTER-Kislovodsk | P| | 30 | 12.9 | 156 | MASTER-IAC | P| | 30 | 17.7 | 156 | MASTER-IAC | P- | 30 | 17.5 | 168 | MASTER-SAAO | P\ | 30 | 18.2 | 198 | MASTER-Kislovodsk | P| | 40 | 14.6 | 201 | MASTER-IAC | P| | 40 | 17.9 | 201 | MASTER-IAC | P- | 40 | 17.6 | 216 | MASTER-SAAO | P\ | 40 | 17.5 | 271 | MASTER-SAAO | P\ | 150 | 18.9 | Coadd 261 | MASTER-IAC | P| | 50 | 18.0 | 262 | MASTER-Kislovodsk | P| | 50 | 13.7 | 273 | MASTER-SAAO | P\ | 50 | 18.6 | 337 | MASTER-Kislovodsk | P| | 60 | 14.9 | 341 | MASTER-SAAO | P\ | 60 | 18.6 | 423 | MASTER-SAAO | P\ | 80 | 18.3 | 533 | MASTER-SAAO | P\ | 300 | 19.3 | Coadd 427 | MASTER-Kislovodsk | P| | 80 | 14.6 | 525 | MASTER-SAAO | P\ | 100 | 18.8 | 537 | MASTER-Kislovodsk | P| | 100 | 15.2 | 648 | MASTER-SAAO | P\ | 120 | 18.8 | 666 | MASTER-Kislovodsk | P| | 120 | 13.9 | 790 | MASTER-SAAO | P\ | 140 | 19.0 | 821 | MASTER-Kislovodsk | P| | 150 | 13.9 | 957 | MASTER-SAAO | P\ | 170 | 18.7 | The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30414 SUBJECT: GRB 210707A: A long GRB detected by INTEGRAL DATE: 21/07/08 06:19:43 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 50 s has been detected by IBAS in the IBIS/ISGRI data at 22:25:05 UT of 2021 July 7. The corresponding WEAK type Alert Packet with the burst position was distributed in real time (Alert n. 9296). The refined coordinates (J2000) are: R.A.= 192.5460 deg DEC.= -63.2763 deg with an uncertainty of 3 arcmin (90% c.l.). The burst had a peak flux of 0.2 ph/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 5e-7 erg/cmq. A plot of the light curve is posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30420 SUBJECT: Fermi GBM Sub-Threshold Detection of GRB 210707A DATE: 21/07/08 16:49:47 GMT FROM: Cori Fletcher at USRA C. Fletcher (USRA) reports on behalf of the Fermi-GBM Team: INTEGRAL/IBAS detected GRB 210707A at 22:25:05 UT (GCN 30414). There was no Fermi-GBM onboard trigger around the event. An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM identified no counterparts. The GBM targeted search [1], the most sensitive, coherent search for GRB-like signals identified a transient most significantly on the 8.192 s timescale, with a false alarm rate of 6.4e-06 Hz and a location consistent with the INTEGRAL/IBAS event, using the standard search protocol with a S/N of 15. The GBM targeted search event was found with the highest significance with a "norm" spectrum (Band function with Epeak = 230 keV, alpha = -1.0, beta = -2.3) for a GRB. [1] Goldstein et al. 2019 arXiv:1903.12597