Gamma-ray Burst 160521A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 21 May 16 03:37:40 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    7470,   Sub_Num: 0
GRB_RA:         129.7185d {+08h 38m 52s} (J2000),
                130.0032d {+08h 40m 01s} (current),
                128.8470d {+08h 35m 23s} (1950)
GRB_DEC:        +46.9009d {+46d 54' 03"} (J2000),
                +46.8424d {+46d 50' 33"} (current),
                +47.0771d {+47d 04' 38"} (1950)
GRB_ERROR:      3.23 [arcmin, radius, statistical only]
GRB_INTEN:      8.37 [sigma]
GRB_TIME:       13055.34 SOD {03:37:35.34} UT
GRB_DATE:       17529 TJD;   142 DOY;   16/05/21
SC_RA:          137.66 [deg] (J2000)
SC_DEC:          50.16 [deg] (J2000)
SUN_POSTN:       58.37d {+03h 53m 28s}  +20.26d {+20d 15' 31"}
SUN_DIST:        62.95 [deg]   Sun_angle= -4.8 [hr] (East of Sun)
MOON_POSTN:     231.17d {+15h 24m 41s}  -14.08d {-14d 04' 34"}
MOON_DIST:      107.81 [deg]
GAL_COORDS:     173.06, 37.42 [deg] galactic lon,lat of the burst
ECL_COORDS:     119.47, 27.44 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=1.2799 and Time_Error=8.0000.  
COMMENTS:       Possibly real GRB event

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 21 May 16 03:39:24 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    7470,   Sub_Num: 1
GRB_RA:         129.7138d {+08h 38m 51s} (J2000),
                129.9985d {+08h 40m 00s} (current),
                128.8421d {+08h 35m 22s} (1950)
GRB_DEC:        +46.9153d {+46d 54' 55"} (J2000),
                +46.8568d {+46d 51' 24"} (current),
                +47.0915d {+47d 05' 29"} (1950)
GRB_ERROR:      2.65 [arcmin, radius, statistical only]
GRB_INTEN:      19.49 [sigma]
GRB_TIME:       13159.77 SOD {03:39:19.77} UT
GRB_DATE:       17529 TJD;   142 DOY;   16/05/21
SC_RA:          137.66 [deg] (J2000)
SC_DEC:          50.16 [deg] (J2000)
SUN_POSTN:       58.37d {+03h 53m 28s}  +20.26d {+20d 15' 32"}
SUN_DIST:        62.95 [deg]   Sun_angle= -4.8 [hr] (East of Sun)
MOON_POSTN:     231.19d {+15h 24m 44s}  -14.08d {-14d 04' 45"}
MOON_DIST:      107.83 [deg]
GAL_COORDS:     173.05, 37.42 [deg] galactic lon,lat of the burst
ECL_COORDS:     119.46, 27.46 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=10.0000 and Time_Error=10.0000.  
COMMENTS:       Possibly real GRB event

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 21 May 16 03:40:40 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    7470,   Sub_Num: 2
GRB_RA:         129.7074d {+08h 38m 50s} (J2000),
                129.9921d {+08h 39m 58s} (current),
                128.8357d {+08h 35m 21s} (1950)
GRB_DEC:        +46.9149d {+46d 54' 53"} (J2000),
                +46.8564d {+46d 51' 23"} (current),
                +47.0911d {+47d 05' 28"} (1950)
GRB_ERROR:      2.60 [arcmin, radius, statistical only]
GRB_INTEN:      23.01 [sigma]
GRB_TIME:       13165.77 SOD {03:39:25.77} UT
GRB_DATE:       17529 TJD;   142 DOY;   16/05/21
SC_RA:          137.66 [deg] (J2000)
SC_DEC:          50.16 [deg] (J2000)
SUN_POSTN:       58.37d {+03h 53m 29s}  +20.26d {+20d 15' 33"}
SUN_DIST:        62.94 [deg]   Sun_angle= -4.8 [hr] (East of Sun)
MOON_POSTN:     231.20d {+15h 24m 47s}  -14.08d {-14d 04' 53"}
MOON_DIST:      107.84 [deg]
GAL_COORDS:     173.05, 37.41 [deg] galactic lon,lat of the burst
ECL_COORDS:     119.46, 27.45 [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

GCN NOTICE

 
TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 21 May 16 04:42:12 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    7471,   Sub_Num: 5
GRB_RA:         129.7108d {+08h 38m 51s} (J2000),
                129.9955d {+08h 39m 59s} (current),
                128.8391d {+08h 35m 21s} (1950)
GRB_DEC:        +46.9142d {+46d 54' 51"} (J2000),
                +46.8557d {+46d 51' 21"} (current),
                +47.0904d {+47d 05' 25"} (1950)
GRB_ERROR:      1.50 [arcmin, radius, statistical only]
GRB_INTEN:      20.81 [sigma] 
GRB_TIME:       13207.77 SOD {03:40:07.77} UT
GRB_DATE:       17529 TJD;   142 DOY;   16/05/21
SC_RA:          137.46 [deg] (J2000) 
SC_DEC:          50.24 [deg] (J2000) 
SUN_POSTN:       58.41d {+03h 53m 39s}  +20.27d {+20d 16' 03"}
SUN_DIST:        62.91 [deg]   Sun_angle= -4.8 [hr] (East of Sun)
MOON_POSTN:     231.71d {+15h 26m 51s}  -14.19d {-14d 11' 21"}
MOON_DIST:      108.27 [deg] 
GAL_COORDS:     173.05, 37.42 [deg] galactic lon,lat of the burst
ECL_COORDS:     119.46, 27.45 [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  
COMMENTS:       
COMMENTS:       NOTE: This INTEGRAL event is spatially(0.00<0.1deg) coincident with the INTEGRAL event (trignum=7470).

GCN Circular #19442
S.Mereghetti (IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, L.Di Gesu' (ISDC, Versoix), and J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
a gamma ray burst lasting about 160 s has been detected by IBAS in the IBIS/ISGRI data at 03:37:20 UT of May 21, 2016.
The refined coordinates (J2000) are:
```
R.A.=  129.7108
DEC.=    46.9142
```
with an uncertainty of 1.5 arcmin (90% c.l.).
The burst had a peak flux of 0.8 counts/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 1.2e-6 erg/cmq.
A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 21 May 16 06:35:27 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    7470,   Sub_Num: 3
GRB_RA:         129.7108d {+08h 38m 51s} (J2000),
                129.9955d {+08h 39m 59s} (current),
                128.8391d {+08h 35m 21s} (1950)
GRB_DEC:        +46.9142d {+46d 54' 51"} (J2000),
                +46.8557d {+46d 51' 21"} (current),
                +47.0904d {+47d 05' 25"} (1950)
GRB_ERROR:      1.50 [arcmin, radius, statistical only]
GRB_INTEN:      19.49 [sigma]
GRB_TIME:       13159.77 SOD {03:39:19.77} UT
GRB_DATE:       17529 TJD;   142 DOY;   16/05/21
SC_RA:          137.46 [deg] (J2000)
SC_DEC:          50.24 [deg] (J2000)
SUN_POSTN:       58.49d {+03h 53m 58s}  +20.28d {+20d 17' 00"}
SUN_DIST:        62.84 [deg]   Sun_angle= -4.8 [hr] (East of Sun)
MOON_POSTN:     232.67d {+15h 30m 40s}  -14.38d {-14d 23' 03"}
MOON_DIST:      109.06 [deg]
GAL_COORDS:     173.05, 37.42 [deg] galactic lon,lat of the burst
ECL_COORDS:     119.46, 27.45 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=10.0000 and Time_Error=10.0000.  
COMMENTS:       refined_coordinates_after_offline_analysis

GCN Circular #19534
K. P. Mooley, T. D. Staley, R. P. Fender (Oxford), G. E. Anderson (Curtin), T. Cantwell (Manchester), C. Rumsey, D. Titterington, S. H. Carey, J. Hickish, Y. C. Perrott, N. Razavi-Ghods, P. Scott (Cambridge), K. Grainge, A. Scaife (Manchester)
We observed the INTEGRAL/IBIS GRB 160521A (Mereghetti et al., GCN 19442) with the AMI Large Array at 15 GHz on 2016 May 24.62, May 27.52, and Jun 03.61 (UT) as part of the 4pisky program. We detect a transient radio source (RA=08:38:51.3 +/-6 arcsec, Dec=+46:54:21 +/-24 arcsec) within the INTEGRAL error circle at 266+/-36 uJy and 133+/-29 uJy in the first two epochs, and obtain a 3sigma upper limit of 93 uJy in the third epoch.
We thank the AMI staff for scheduling these observations. The AMI-GRB database is a log of all GRB follow up observations with the AMI, and is available at http://4pisky.org/ami-grb/.

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Jochen Greiner, last update: 14-Jun-2016 [Disclaimer]