- GCN/BACODINE POSITION NOTICE
TITLE: GCN/MAXI NOTICE
NOTICE_DATE: Fri 12 Oct 18 09:13:45 UT
NOTICE_TYPE: MAXI Unknown Source Position
EVENT_ID_NUM: 402124071
EVENT_RA: 93.34d {+06h 13m 21s} (J2000),
93.62d {+06h 14m 28s} (current),
92.59d {+06h 10m 22s} (1950)
EVENT_DEC: +20.39d {+20d 23' 13"} (J2000),
+20.38d {+20d 22' 50"} (current),
+20.40d {+20d 24' 05"} (1950)
EVENT_ERROR: 1.0 [deg radius, stat+sys, 90% containment]
EVENT_FLUX: 148.0 +- 0.0 [mCrab]
EVENT_DATE: 18402 TJD; 284 DOY; 18/10/11
EVENT_TIME: 12981.00 SOD {03:36:21.00} UT
EVENT_TSCALE: 10s
EVENT_EBAND: Low, 2-4 keV
SUN_POSTN: 197.53d {+13h 10m 08s} -7.44d {-07d 26' 21"}
SUN_DIST: 105.58 [deg]
MOON_POSTN: 238.46d {+15h 53m 51s} -15.74d {-15d 44' 37"}
MOON_DIST: 146.32 [deg]
MOON_ILLUM: 12 [%]
GAL_COORDS: 190.55, 1.19 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 93.13, -3.02 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: MAXI Unknown Source Position. GRB or unknown X-ray Transient.
- GCN Circular #23327
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.
- GCN Circular #23328
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.
- GCN Circular #23329
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.
- GCN Circular #23330
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
- GCN Circular #23345
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.