//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28440 SUBJECT: IPN triangulation of GRB 200916B (short) DATE: 20/09/17 17:18:42 GMT FROM: Dmitry Svinkin at Ioffe Institute A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, K. Hurley, on behalf of the IPN, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, report: A short-duration GRB 200916B has been detected by Konus-Wind, INTEGRAL (SPI-ACS), and Swift (BAT), so far, at about 56490 s UT (15:41:30). 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: 224.729 (14h 58m 55s) -39.130 (-39d 07' 47") Corners: 225.036 (15h 00m 09s) -37.463 (-37d 27' 46") 225.754 (15h 03m 01s) -37.404 (-37d 24' 14") 224.398 (14h 57m 35s) -40.797 (-40d 47' 48") 223.640 (14h 54m 34s) -40.848 (-40d 50' 53") --------------------------------------------- The error box area is 1.88 sq. deg, and its maximum dimension is 3.8 deg (the minimum one is 32 arcmin). The Sun distance was about 61 deg. This box may be improved. This burst is spatially and temporally inconsistent with the IceCube-200916A event. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB200916_T56489/IPN/ The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. The Swift (BAT) event data used for the IPN localization came from the GUANO system (https://www.swift.psu.edu/guano/). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28451 SUBJECT: GRB 200916B: AstroSat CZTI detection DATE: 20/09/18 14:41:34 GMT FROM: Soumya Gupta at IUCAA/ASTROSAT S. Gupta, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (IUCAA/TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data showed detection of a short GRB 200916B, which was also detected by IPN ( Ridnaia A. et al., GCN #28440). The source was clearly detected in the 40-200 keV energy range. The light curve showed a single peak of emission peaking at 2020-09-16 15:41:29.437 UT. The measured peak count rate associated with the burst is 143 +/- 23 cts/s above the background in the combined data of four quadrants, with a total of 230 +/- 2 cts. The local mean background count rate was 422 +/- 1 cts/s. Using cumulative rates, we measure a T90 of 1.7 s. It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed a single peak of emission peaking at 2020-09-16 15:41:28.00 UT. The measured peak count rate is 378 +/- 46 cts/s above the background in the combined Veto data of four quadrants, with a total of 727 +/- 5 cts. The local mean background count rate was 1739 +/- 2 cts/s. We measure a T90 of 1.7 s from the cumulative Veto light curve. CZTI GRB detections are reported regularly on the payload site at​ http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28456 SUBJECT: GRB 200916B: MASTER optical observation DATE: 20/09/19 12:27:13 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, A.Kuznetsov, K.Zhirkov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, A.Chasovnikov, V.Topolev, A.Pozdnyakov, 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), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov, Yu. Sergienko (Blagoveschensk Educational State University) MASTER-SAAO robotic telescope (Global MASTER-Net http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of short GRB200916B (Ridnaia et al. GCN 28440) errorbox 85399s after notice time (2 days 6634s after trigger time) at 2020-09-18 17:32:03 UT, with upper limit to 19.4 mag. The observations began at zenith distance = 45 deg. The sun altitude was -13.4 deg. The galactic latitude b = -60 deg., longitude l = 98 deg. Real time updated cover map: https://master.sai.msu.ru/site/master2/ligo_1.php?id=11529 We obtained following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment 179525 | 2020-09-18 17:32:03 | MASTER-SAAO | (15h 02m 46.17s , -37d 57m 43.2s) | C | 180 | 19.4 | 180925 | 2020-09-18 17:55:23 | MASTER-SAAO | (14h 49m 20.69s , -39d 56m 18.2s) | C | 180 | 19.3 | 181124 | 2020-09-18 17:58:43 | MASTER-SAAO | (14h 49m 16.07s , -39d 57m 17.9s) | C | 180 | 19.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.