GRB 180722A
GCN Circular 23005
Subject
GRB 180722A: MAXI/GSC detection
Date
2018-07-22T07:26:39Z (7 years ago)
From
H. Negoro at Nihon U. <negoro@phys.cst.nihon-u.ac.jp>
R. Shimomukai (JAXA), H. Negoro (Nihon U.), W. Iwakiri (Chuo U.),
M. Nakajima, W. Maruyama, A. Sakamaki (Nihon U.),
T. Mihara, S. Nakahira, F. Yatabe, Y. Takao, M. Matsuoka (RIKEN),
N. Kawai, M. Sugizaki, Y. Tachibana, K. Morita (Tokyo Tech),
T. Sakamoto, M. Serino, S. Sugita, Y. Kawakubo, T. Hashimoto, A. Yoshida (AGU),
S. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara, N. Isobe (JAXA),
Y. Ueda, A. Tanimoto, T. Morita, S. Yamada (Kyoto U.), Y. Tsuboi, R. Sasaki,
H. Kawai, T. Sato (Chuo U.), H. Tsunemi, T. Yoneyama (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 05:59:06 UT on 2018 July 22.
Assuming that the source flux was constant over the transit,
we obtain the source position at
(R.A., Dec) = (302.894 deg, 24.221 deg) = (20 11 34, +24 13 15) (J2000)
with a statistical 90% C.L. elliptical error region
with long and short radii of 0.21 deg and 0.17 deg, respectively.
The roll angle of the long axis from the north direction is 14.0 deg counterclockwise.
There is an additional systematic uncertainty of 0.1 deg (90% containment radius).
We estimated a rectangular error box for the transient source with the following corners:
(301.985, 24.469) deg = (20 07 56, +24 28 07) (J2000)
(301.898, 24.157) deg = (20 07 35, +24 09 26) (J2000)
(303.593, 23.939) deg = (20 14 22, +23 56 18) (J2000)
(303.685, 24.249) deg = (20 14 44, +24 14 56) (J2000)
The X-ray flux averaged over the scan was 259 +- 32 mCrab
(4.0-10.0keV, 1 sigma error).
There was no significant excess flux in the previous transit at UT 04:26.
GCN Circular 23006
Subject
GRB 180722A: MASTER optical observation
Date
2018-07-22T08:18:13Z (7 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, N.Tiurina,
V.Kornilov, A.Kuznetsov, V.Chazov, I. Gorbunov,
D.Zimnukhov, D.Kuvshinov, P.Balanutsa, V.Vladimirov, D.Vlasenko
Lomonosov Moscow State University,SAI
D. Buckley,
South African Astronomical Observatory (SAAO)
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias (IAC)
A. Tlatov, V.Senik, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
R. Podesta, F. Podesta, C. Lopez, C.Francile
Observatorio Astronomico Felix Aguilar (OAFA)
H.Levato,
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
O. Gres, N.M.Budnev , Yu.Ishmuhametova
Irkutsk State University (ISU)
A. Gabovich, V. Yurkov, Yu. Sergienko
Blagoveschensk Educational State University (BSPU)
MASTER-OAFA robotic telescope (MASTER-Net: http://observ.pereplet.ru,
Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in
Argentina (OAFA observatory of San Juan National University) was pointed
to the GRB180722A( Shimomukai et al., MAXI/GSC detection, GCN #23005)
17 sec after notice time and 2572 sec after trigger time at 2018-07-22
06:42:08 UT. On our first (180s exposure) set we not found optical
transient within MAXI error-box (ra=302.613 dec=24.2364 r=1) brighter
then 17.7.
The observations made on zenit distance = 62 degrees, galaxy latitude b =
-5 degrees.
The moon (74 % bright part) is 4 degrees above the horizon. The distance
between moon and object is 75 .
The sun altitude is -61.0 degree.
The object can be observed till 2018-07-22 09:45:34.
The message may be cited.
GCN Circular 23015
Subject
GRB 180722A: Tiled Swift observations
Date
2018-07-22T18:42:16Z (7 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a series of observations, tiled on the sky, of the
MAXI GRB 180722A. Automated analysis of the XRT data will
be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00071
Any uncatalogued X-ray sources detected in this analysis will be
reported on this website and via GCN COUNTERPART notices. The probability of finding
serendipitous sources, unrelated to the MAXI event is high: any X-ray source
considered to be a probable afterglow candidate will be reported via a GCN Circular
after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et
al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular 23026
Subject
GRB 180722A: MASTER second inspection
Date
2018-07-24T10:16:15Z (7 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, N.Tiurina, D.Vlasenko, V.Kornilov, A.Kuznetsov,
V.Chazov, I. Gorbunov, D.Zimnukhov, D.Kuvshinov, P.Balanutsa,
V.Vladimirov,
Lomonosov Moscow State University,SAI
D. Buckley,
South African Astronomical Observatory (SAAO)
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias (IAC)
A. Tlatov, V.Senik, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
R. Podesta, F. Podesta, C. Lopez, C.Francile
Observatorio Astronomico Felix Aguilar (OAFA)
H.Levato,
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
O. Gres, N.M.Budnev , Yu.Ishmuhametova
Irkutsk State University (ISU)
A. Gabovich, V. Yurkov, Yu. Sergienko
Blagoveschensk Educational State University (BSPU)
MASTER-SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in SAAO was starting second survey on the MAXI GRB180722A
error-box
(ra=20 11 34 dec=+24 13 15 r=1) 61549 sec after notice time and 65839 sec
after trigger time at 2018-07-23 00:16:35 UT (Shimomukai et al.,
MAXI/GSC detection, GCN #23005; Lipunov et al., GCN #23006). The 5-sigma
upper limit on our first (180s exposure) set is about 19.0 mag
This error-box was observed by MASTER-Amur ( 2018-07-23
12:53:17-14:00:20UT, 60s, mlim=17.8) and another MASTER sites.
The coverage map of the 3 sigms error box is available at
http://master.sai.msu.ru/static/OT/MASTERMAXIGRB180722A.jpg
The observations made on zenit distance = 61 degrees, galaxy latitude b =
-6 degree.
The moon (80 % bright part) is 17 degrees above the horizon. The distance
between moon and object is 69
The sun altitude is -65.7 degree.
The object can be observed till 2018-07-23 03:41:44
The message may be cited.
GCN Circular 23032
Subject
GRB 180722A: Swift-XRT observations
Date
2018-07-24T14:33:45Z (7 years ago)
From
Boris Sbarufatti at PSU <bxs60@psu.edu>
P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), B. Sbarufatti (INAF-OAB/PSU),
D.N. Burrows (PSU), A. Tohuvavohu (PSU), S.L. Gibson (U. Leicester), Z.
Liu (NAOC / U. Leicester), J.P. Osborne (U. Leicester), A. D'Ai
(INAF-IASFPA) and P.A. Evans (U. Leicester) report on behalf of the
Swift-XRT team:
Swift-XRT has performed follow-up observations of the MAXI-detected
burst GRB 180722A (Shimomukai et al. GCN Circ. 23005) in a series of
observations tiled on the sky. The total exposure time is 1.2 ks,
distributed over 7 tiles; the maximum exposure at a single sky location
was 391 s. The data were collected between T0+45.7 ks and T0+47.1 ks,
and are entirely in Photon Counting (PC) mode.
No X-ray sources have been detected. The 3-sigma upper limit in the
field (not including the regions where the tiles overlap) ranges from
~0.04 to ~0.12 ct s^-1, corresponding to a 0.3-10 keV observed flux of
1.8e-12 to 4.9e-12 erg cm^-2 s^-1 (assuming a typical GRB spectrum).
The results of the XRT-team automatic analysis of the tiled XRT
observations, including a position-specific upper limit calculator, are
available at http://www.swift.ac.uk/xrt_products/TILED_GRB00071.
This circular is an official product of the Swift-XRT team.