Gamma-ray Burst 131122A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 22 Nov 13 21:25:21 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    6392,   Sub_Num: 1
GRB_RA:         152.5301d {+10h 10m 07s} (J2000),
                152.7643d {+10h 11m 03s} (current),
                151.6825d {+10h 06m 44s} (1950)
GRB_DEC:        +57.7131d {+57d 42' 47"} (J2000),
                +57.6444d {+57d 38' 40"} (current),
                +57.9592d {+57d 57' 33"} (1950)
GRB_ERROR:      3.28 [arcmin, radius, statistical only]
GRB_INTEN:      8.09 [sigma]
GRB_TIME:       77117.19 SOD {21:25:17.19} UT
GRB_DATE:       16618 TJD;   326 DOY;   13/11/22
SC_RA:          161.94 [deg] (J2000)
SC_DEC:          67.14 [deg] (J2000)
SUN_POSTN:      238.59d {+15h 54m 22s}  -20.30d {-20d 18' 13"}
SUN_DIST:       104.87 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:     119.82d {+07h 59m 18s}  +15.32d {+15d 19' 29"}
MOON_DIST:       48.97 [deg]
GAL_COORDS:     154.32, 48.41 [deg] galactic lon,lat of the burst
ECL_COORDS:     130.12, 42.66 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=20.0000 and Time_Error=20.0000.  
COMMENTS:       Possibly real GRB event

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 22 Nov 13 21:28:19 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    6392,   Sub_Num: 2
GRB_RA:         152.5312d {+10h 10m 07s} (J2000),
                152.7654d {+10h 11m 04s} (current),
                151.6837d {+10h 06m 44s} (1950)
GRB_DEC:        +57.7099d {+57d 42' 36"} (J2000),
                +57.6412d {+57d 38' 28"} (current),
                +57.9560d {+57d 57' 21"} (1950)
GRB_ERROR:      2.78 [arcmin, radius, statistical only]
GRB_INTEN:      13.83 [sigma]
GRB_TIME:       77189.19 SOD {21:26:29.19} UT
GRB_DATE:       16618 TJD;   326 DOY;   13/11/22
SC_RA:          161.94 [deg] (J2000)
SC_DEC:          67.14 [deg] (J2000)
SUN_POSTN:      238.59d {+15h 54m 23s}  -20.30d {-20d 18' 15"}
SUN_DIST:       104.87 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:     119.85d {+07h 59m 24s}  +15.32d {+15d 19' 10"}
MOON_DIST:       48.97 [deg]
GAL_COORDS:     154.32, 48.41 [deg] galactic lon,lat of the burst
ECL_COORDS:     130.13, 42.65 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=100.0000 and Time_Error=100.0000.  
COMMENTS:       Possibly real GRB event

GCN Circular #15509
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, D.Denisenko, A.Sankovich Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University
V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
There are two telescope from MASTER-NET was pointed to the GRB131122A.
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB131122A 69 sec after notice time and 76 sec after GRB time at 2013-11-22 21:26:33.898 UT in two polarizations. On our first (20s exposure) set we haven`t found optical transient within INTEGRAL trigger N 6392 error-box (ra=10 11 02 dec=+57 38 22 r=0.054667). The polaroids have RA and DEC orientation on this observatory. The 5-sigma upper limit has been about 16.4 mag
MASTER II robotic telescope located in Blagoveschensk was pointed to the GRB131122A 76 sec after notice time and 82 sec after GRB time at 2013-11-22 21:26:39.328 UT in two polarizations. On our first (20s exposure) set we haven`t found optical transient within INTEGRAL trigger N 6392 error-box (ra=10 11 02 dec=+57 38 22 r=0.054667). The polaroids are oriented under corners 45 and 135 to the RA axis on this observatory. The 5-sigma upper limit has been about 16.3 mag The message may be cited.
The data reduction are continued.
The message may be cited.

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 22 Nov 13 22:22:39 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    6392,   Sub_Num: 3
GRB_RA:         152.5551d {+10h 10m 13s} (J2000),
                152.7893d {+10h 11m 09s} (current),
                151.7075d {+10h 06m 50s} (1950)
GRB_DEC:        +57.7396d {+57d 44' 23"} (J2000),
                +57.6709d {+57d 40' 15"} (current),
                +57.9857d {+57d 59' 09"} (1950)
GRB_ERROR:      1.60 [arcmin, radius, statistical only]
GRB_INTEN:      13.83 [sigma]
GRB_TIME:       77189.19 SOD {21:26:29.19} UT
GRB_DATE:       16618 TJD;   326 DOY;   13/11/22
SC_RA:          161.94 [deg] (J2000)
SC_DEC:          67.14 [deg] (J2000)
SUN_POSTN:      238.63d {+15h 54m 32s}  -20.31d {-20d 18' 43"}
SUN_DIST:       104.89 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:     120.30d {+08h 01m 12s}  +15.22d {+15d 13' 29"}
MOON_DIST:       48.92 [deg]
GAL_COORDS:     154.27, 48.41 [deg] galactic lon,lat of the burst
ECL_COORDS:     130.12, 42.69 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=100.0000 and Time_Error=100.0000.  
COMMENTS:       refined_coordinates_after_offline_analysis

GCN Circular #15510
D. Gotz (CEA Saclay), S. Mereghetti (IASF-Milano), E. Bozzo, C. Ferrigno, (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
a gamma ray burst lasting about 70 s has been detected by IBAS in the IBIS/ISGRI data at 21:25:01 U.T. on November 22. Its refined coordinates (J2000) are:
```
  R.A.: 152.5553 deg
  DEC.: 57.7398 deg
```
with an uncertainty of 1.6 arc min (90% c.l.).
The burst had a fluence of about 2x10^-6 erg/cmsq in the 20-200 keV energy band, and a peak flux of 0.4 ph/cmsq/s in the same energy band over 1 s.
A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN Circular #15511
D. Xu (DARK/NBI), G.-J. Feng, X. Zhang, A. Esamdin, L. Ma (XAO) report:
We observed the IBIS/ISGRI field of GRB 131122A (Gotz et al., GCN 15510) using the 1m telescope located on Mt. Nanshan, Xinjiang, China. We obtained 6x360s R-band frames at a mean time of 22:28:18 UT on 2013-11-22, i.e., 1.055 hr after the INTEGRAL trigger.
Visual inspect of the Intergral 1.6 arcmin error circle against DSS II and SDSS shows that no new optical source is detected down to a limiting magnitude of R=20.6 mag.
GCN Circular #15512
J. Gorosabel (IAA-CSIC/UPV-EHU), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI= ), D. Xu (DARK/NBI), S. Schulze (PUC, MCSS), N.R. Tanvir (U. Leicester),= O. Smirnova (NOT, U. Latvia), J. K=E5re (U. Oslo), E. Pakstiene (Vilniu= s U.), A.B. Aksnes, C. Eide, E.N. Traore, J. Joberg, L.K. Seljebotn, N. V= on Huth, M. Lapadatu, R.W. Cale, M Heger (Horten videreg=E5ende skole) re= port on behalf of a larger collaboration:
We observed the field of the INTEGRAL GRB 131122A (Gorbovskoy et al., GCN 15509) with the 2.5m Nordic Optical Telescope (NOT) equipped with ALFOSC . Observations began at 00:34 UT (3.13 hr after the burst), when the field was at an airmass of ~3, and consisted of 8x180s in i-band, covering the complete INTEGRAL error box. The seeing of the combined image is around 0.9".
We do not see any obvious new source down to the limit of the SDSS i-band image to which we have compared, although we note that our frame is some what deeper, showing faint sources not present in the SDSS. A more precise localisation and/or deeper comparison image will be needed in order to identify a possible optical counterpart to GRB 131122A.
GCN Circular #15513
A. Maselli (INAF-IASFPA) and V. D'Elia (ASDC) report on behalf of the Swift-XRT team:
We have analysed 3.0 ks of XRT data for the INTEGRAL-detected burst GRB 131122A, from 13.7 ks to 21.1 ks after the INTEGRAL trigger. The data are entirely in Photon Counting (PC) mode. An X-ray source is detected within the INTEGRAL error circle. Using 1383 s of PC mode data and 1 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 152.54219, +57.72770 which is equivalent to:
```
RA (J2000): 10h 10m 10.12s
Dec(J2000): +57d 43' 39.7"
```
with an uncertainty of 4.8 arcsec (radius, 90% confidence). This position is 50 arcsec from the INTEGRAL position. We cannot determine at the present time whether the source is fading.
We note the presence of two DSS galaxies northbound the XRT source, close to the XRT error circle.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020328.
This circular is an official product of the Swift-XRT team.
GCN Circular #15514
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), J. Gorosabel (IAA-CSIC/UPV-EHU= ), D. Xu (DARK/NBI), S. Schulze (PUC, MCSS), N.R. Tanvir (U. Leicester),=20 O. Smirnova (NOT, U. Latvia), J. K=E5re (U. Oslo), E. Pakstiene (Vilnius = U.), A.B. Aksnes, C. Eide, E.N. Traore, J. Joberg, L.K. Seljebotn, N. Von Huth= , M. Lapadatu, R.W. Cale, M Heger (Horten videreg=E5ende skole) report on=20 behalf of a larger collaboration:
Further analysis of our i-band imaging from the 2.5 m NOT (Gorosabel et a= l.,=20 GCN 15512) of GRB 131122A (Gotz et al., GCN 15510), with mean epoch=20 00:49 UT (3.40 hr after the burst), shows no new source within the Swift-= XRT=20 error box (Maselli et al., GCN 15513) down to a 3-sigma magnitude limit o= f=20 i=3D23.5 (AB).
GCN Circular #15515
C. A. Swenson (PSU) and A. Maselli (INAF-IASFPA) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 131122 13578 s after the INTEGRAL trigger (Gotz et al., GCN Circ. 15510). No optical counterpart consistent with the potential XRT afterglow position (Maselli et al., GCN Circ. 15513) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag
  
white            14302        20578          855         >21.3
v                20830        21061          227         >19.0
u                13578        20136         1375         >21.0
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #15557
A. Maselli (INAF-IASFPA) reports on behalf of the Swift-XRT team:
Swift-XRT performed a second observation of the INTEGRAL-detected burst GRB 131122A (Gotz et al., GCN Circ. 15510) starting on 2013 November 29, from 596 to 690 ks after the INTEGRAL trigger, for a total exposure of 4.9 ks. The source reported in occasion of the first XRT observation by Maselli & D'Elia (GCN Circ. 15513) is now detected at a count rate of (1.59+/-0.69)e-3 ct/s. This value is considerably lower than (1.06+/-0.21)e-2 ct/s corresponding to the first observation: therefore, we point at this source as the afterglow of GRB 131122A.
This circular is an official product of the Swift-XRT team.

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Jochen Greiner, last update: 01-Dec-2013 [Disclaimer]