//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 23327 SUBJECT: GRB 181011A: MAXI/GSC detection DATE: 18/10/12 09:35:00 GMT FROM: H. Negoro at Nihon U. Y. Kawakubo (AGU), M. Nakajima, H. Negoro (Nihon U.), M. Serino (AGU), S. Nakahira (RIKEN), A. Sakamaki, W. Maruyama, M. Aoki, K. Kobayashi (Nihon U.), T. Mihara, F. Yatabe, Y. Takao, M. Matsuoka (RIKEN), T. Sakamoto, S. Sugita, T. Hashimoto, A. Yoshida (AGU), N. Kawai, M. Sugizaki, Y. Tachibana, K. Morita (Tokyo Tech), S. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara, N. Isobe, R. Shimomukai, T. Midooka (JAXA), Y. Ueda, A. Tanimoto, T. Morita, S. Yamada, S. Ogawa (Kyoto U.), Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, T. Sato (Chuo U.), H. Tsunemi, T. Yoneyama, K. Asakura, S. Ide (Osaka U.), M. Yamauchi, K. Hidaka, S. Iwahori (Miyazaki U.), T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.), M. Shidatsu (Ehime U.) report on behalf of the MAXI team: The MAXI/GSC nova alert system triggered on a bright uncatalogued X-ray transient source at 2018-10-11T03:36:12 UT. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (93.500 deg, 20.837 deg) = (06 14 00, +20 50 13) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.26 deg and 0.18 deg, respectively. The roll angle of the long axis from the north direction is 101.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan was 167 +- 28 mCrab (4.0-10.0keV, 1 sigma error). Without assumptions on the source constancy, we obtain a rectangular error box for the transient source with the following corners: (R.A., Dec) = (94.338, 21.465) deg = (06 17 21, +21 27 53) (J2000) (R.A., Dec) = (93.931, 21.742) deg = (06 15 43, +21 44 31) (J2000) (R.A., Dec) = (92.419, 19.784) deg = (06 09 40, +19 47 02) (J2000) (R.A., Dec) = (92.824, 19.511) deg = (06 11 17, +19 30 39) (J2000) There was no significant excess flux in the next transit at 03:55 UT with an upper limit of 20 mCrab. We note that this burst was detected just after the ISS maneuver, and the data arrived at JAXA/TKSC about about 8 hr late. This and the confirmation of the event result in the late notice of this burst. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 23328 SUBJECT: IPN Triangulation of GRB 181011A (long) DATE: 18/10/12 12:47:30 GMT FROM: Dmitry Svinkin at Ioffe Institute K. Hurley, on behalf of the IPN, I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova, and T. Cline on behalf of the Konus-Wind team, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report: The long-duration GRB 181011A (MAXI/GSC detection: Kawakubo et al., GCN Circ. 23327) was detected by Konus-Wind, INTEGRAL (SPI-ACS), and Mars-Odyssey (HEND) at about 12979 s UT (03:36:19). We have triangulated it to a preliminary error box whose coordinates are: --------------------------------- RA(2000), deg Dec(2000), deg --------------------------------- Center: 93.1530 19.1552 Corners: 93.2025 23.5555 94.8930 14.2497 94.7356 11.0039 91.9740 23.5347 -------------------------------- The error box area is about 10 sq. deg, and its maximum dimension is 11.2 deg (the minimum one is 1.1 deg). The Sun distance was about 171 deg. This box may be improved. The box is consistent with the MAXI/GSC localization. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB181011_T12979/IPN/ The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 23329 SUBJECT: GRB 181011A: CALET Gamma-Ray Burst Monitor detection DATE: 18/10/12 15:22:41 GMT FROM: Valentin Pal'shin at AGU P. S. Marrocchesi (U of Siena), A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita, Y. Kawakubo, A. Tezuka, S. Matsukawa, H. Onozawa, T. Ito, H. Morita, Y. Sone (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), I. Takahashi (IPMU), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), W. Ishizaki (ICRR), M. L. Cherry (LSU), S. Ricciarini (U of Florence), A. V. Penacchioni and the CALET collaboration: The MAXI GRB 181011A (Kawakubo et al., GCN Circ. 23327) was detected in ground analysis of the CALET Gamma-ray Burst Monitor (CGBM) data near the MAXI trigger time at T0=03:36:12 UT on 11 October 2018. The burst signal was seen by all CGBM detectors. The burst light curve shows a single multi-peaked emission episode which starts at T+21 sec and ends at T+55 sec. The T90 and the T50 durations measured by the SGM data are 31 +- 8 sec and 15 +- 8 sec (40-1000 keV), respectively. The ground processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1223264170/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 23330 SUBJECT: GRB 181011A: Global MASTER Net optical inspection DATE: 18/10/12 15:33:40 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) Hugo Levato and Carlos Saffe 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-Kislovodsk robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was starting survey on the IPN GRB181011.15 error-box (K. Hurley et al GCN 23328) 33218 sec after notice time and 61888 sec after trigger time at 2018-10-11 20:47:47 UT. The 5-sigma upper limit on our images is about 19 mag. MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was starting survey on the IPN GRB181011.15 error-box 45716 sec after notice time and 74386 sec after trigger time at 2018-10-12 00:16:05 UT. The 5-sigma upper limit on our images is about 19 mag. MASTER-Net cover full IPN (K. Hurley et al. GCN 23328) and MAXI (Kawakubo et al. GCN 23327) error boxes. Coverage map is available here: http://master.sai.msu.ru/static//IPN/db/GRB181011.15/img/ligo_master_2018-10-12-05-03-00.eb.zoom.1.pngmlimit.png //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 23345 SUBJECT: GRB 181011A: MITSuME Akeno and Okayama optical upper limits DATE: 18/10/17 10:02:24 GMT FROM: Adachi Ryo at Tokyo Institute of Tech R. Adachi, R. Itoh, K. L. Murata, Y. Tachibana, K. Morita, K. Shiraishi, K. Iida, M. Oeda, M. Niwano, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We performed tiling observation for error region of GRB 181011A (Kawakubo et al., GCN Circular #23327) with the optical three color (g', Rc, and Ic) CCD cameras attached to the two MITSuME 50cm telescopes at Akeno Observatory and Okayama Astrophysical Observatory, in Japan. The observation started on 2018-10-12 13:51:34 UT. Our tiling observation covers about 90% of MAXI error region. We did not find any point source at the position of the MAXI error box (Kawakubo et al., GCN Circular #23327) in all three bands. Unfortunately, thin cloud were passing during the observation therefore we could not obtain uniform exposure for each data set between tiling. Finally we obtained following 5-sigma upper limits for the magnitudes 35% region: g' > 18.0, Rc > 17.7, Ic > 17.0 40% region: g' > 16.5, Rc > 16.2, Ic > 15.7 15% region: g' > 15.0, Rc > 14.7, Ic > 14.2 We used UCAC-4 catalog for flux calibration.