Gamma-ray Burst 120419A

(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:    Thu 19 Apr 12 12:56:50 UT
NOTICE_TYPE:    INTEGRAL Weak
TRIGGER_NUM:    6511,   Sub_Num: 0
GRB_RA:         187.5256d {+12h 30m 06s} (J2000),
                187.7010d {+12h 30m 48s} (current),
                186.8173d {+12h 27m 16s} (1950)
GRB_DEC:        -63.0064d {-63d 00' 22"} (J2000),
                -63.0743d {-63d 04' 26"} (current),
                -62.7302d {-62d 43' 48"} (1950)
GRB_ERROR:      3.45 [arcmin, radius, statistical only]
GRB_INTEN:      7.26 [sigma]
GRB_TIME:       46604.80 SOD {12:56:44.80} UT
GRB_DATE:       16036 TJD;   110 DOY;   12/04/19
SC_RA:          196.35 [deg] (J2000)
SC_DEC:         -69.84 [deg] (J2000)
SUN_POSTN:       27.78d {+01h 51m 08s}  +11.42d {+11d 25' 28"}
SUN_DIST:       126.40 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:       7.84d {+00h 31m 22s}   +7.98d {+07d 58' 38"}
MOON_DIST:      124.90 [deg]
GAL_COORDS:     300.51, -0.23 [deg] galactic lon,lat of the burst
ECL_COORDS:     222.27,-52.55 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates -- this is the weak/subthreshold trigger notice.  
COMMENTS:       This notice may or may not be followed by a Wakeup/Refined/Offline notice.  
COMMENTS:       Time_Scale=10.0000 and Time_Error=10.0000.  
COMMENTS:       Possibly real GRB event (WEAK detection)

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Thu 19 Apr 12 12:56:56 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    6511,   Sub_Num: 1
GRB_RA:         187.4392d {+12h 29m 45s} (J2000),
                187.6144d {+12h 30m 27s} (current),
                186.7317d {+12h 26m 56s} (1950)
GRB_DEC:        -63.0124d {-63d 00' 44"} (J2000),
                -63.0803d {-63d 04' 48"} (current),
                -62.7361d {-62d 44' 09"} (1950)
GRB_ERROR:      3.28 [arcmin, radius, statistical only]
GRB_INTEN:      8.11 [sigma]
GRB_TIME:       46611.03 SOD {12:56:51.03} UT
GRB_DATE:       16036 TJD;   110 DOY;   12/04/19
SC_RA:          196.35 [deg] (J2000)
SC_DEC:         -69.84 [deg] (J2000)
SUN_POSTN:       27.78d {+01h 51m 08s}  +11.42d {+11d 25' 28"}
SUN_DIST:       126.38 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:       7.84d {+00h 31m 22s}   +7.98d {+07d 58' 39"}
MOON_DIST:      124.90 [deg]
GAL_COORDS:     300.48, -0.24 [deg] galactic lon,lat of the burst
ECL_COORDS:     222.22,-52.58 [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

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Thu 19 Apr 12 12:59:56 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    6511,   Sub_Num: 2
GRB_RA:         187.3689d {+12h 29m 29s} (J2000),
                187.5440d {+12h 30m 11s} (current),
                186.6620d {+12h 26m 39s} (1950)
GRB_DEC:        -63.0274d {-63d 01' 38"} (J2000),
                -63.0953d {-63d 05' 42"} (current),
                -62.7511d {-62d 45' 03"} (1950)
GRB_ERROR:      3.13 [arcmin, radius, statistical only]
GRB_INTEN:      9.14 [sigma]
GRB_TIME:       46638.80 SOD {12:57:18.80} UT
GRB_DATE:       16036 TJD;   110 DOY;   12/04/19
SC_RA:          196.35 [deg] (J2000)
SC_DEC:         -69.84 [deg] (J2000)
SUN_POSTN:       27.79d {+01h 51m 09s}  +11.43d {+11d 25' 31"}
SUN_DIST:       126.36 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:       7.87d {+00h 31m 28s}   +7.99d {+07d 59' 11"}
MOON_DIST:      124.89 [deg]
GAL_COORDS:     300.44, -0.26 [deg] galactic lon,lat of the burst
ECL_COORDS:     222.20,-52.61 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=40.0000 and Time_Error=40.0000.  
COMMENTS:       Possibly real GRB event

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Thu 19 Apr 12 14:03:14 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    6511,   Sub_Num: 3
GRB_RA:         187.4023d {+12h 29m 37s} (J2000),
                187.5774d {+12h 30m 19s} (current),
                186.6951d {+12h 26m 47s} (1950)
GRB_DEC:        -63.0168d {-63d 01' 00"} (J2000),
                -63.0847d {-63d 05' 04"} (current),
                -62.7405d {-62d 44' 25"} (1950)
GRB_ERROR:      2.50 [arcmin, radius, statistical only]
GRB_INTEN:      9.14 [sigma]
GRB_TIME:       46638.80 SOD {12:57:18.80} UT
GRB_DATE:       16036 TJD;   110 DOY;   12/04/19
SC_RA:          196.35 [deg] (J2000)
SC_DEC:         -69.84 [deg] (J2000)
SUN_POSTN:       27.83d {+01h 51m 19s}  +11.44d {+11d 26' 25"}
SUN_DIST:       126.38 [deg]   Sun_angle= -10.6 [hr] (East of Sun)
MOON_POSTN:       8.37d {+00h 33m 28s}   +8.17d {+08d 10' 07"}
MOON_DIST:      125.08 [deg]
GAL_COORDS:     300.46, -0.25 [deg] galactic lon,lat of the burst
ECL_COORDS:     222.21,-52.59 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=40.0000 and Time_Error=40.0000.  
COMMENTS:       refined_coordinates_after_offline_analysis

GCN Circular #13241
D.Gotz (CEA-Saclay), S.Mereghetti (IASF-Milano), J. Borkowski (CAMK, Torun), E. Bozzo, C.Ricci (ISDC, Versoix), on behalf of the IBAS Localization Team report:
a long gamma ray burst lasting about 20 s has been detected by IBAS in the IBIS/ISGRI data at 12:56:25 UT of April 19
```
Its refined coordinates (J2000) are:
RA: 187.4024 [degrees]
DEC: -63.017 [degrees]
```
with an uncertainty of 2.5 arcmin (90% c.l.).
A preliminary analysis gives a 20-200 keV fluence of about 2e-7 erg/cm2 and a peak flux of about 0.4 ph/cm2 s (1 s integration time)
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN Circular #13242
K.L. Page, R.L.C. Starling, P.A. Evans (U. Leicester), S.R. Oates (MSSL-UCL) and T. Sakamoto (GSFC/UMBC) report on behalf of the Swift-XRT and UVOT teams:
We have analysed 2.0 ks of XRT data for the INTEGRAL-detected burst GRB 120419A (Gotz et al., GCN Circ. 13241), from 25.6 ks to 32.3 ks after the INTEGRAL trigger. The data are entirely in Photon Counting (PC) mode. There is a faint source detected within the INTEGRAL error circle at a position of RA, Dec =3D 187.38762, -63.00791, which is equivalent to
```
RA (J2000): 12h 29m 33.03s
Dec(J2000): -63d 00' 28.5"
```
with an uncertainty of 4.5". This position is 40.7" from the INTEGRAL position. The source count rate is 0.0079 +/- 0.0033 count s^-1; we cannot determine whether the source is fading.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020215.
The UVOT began settled observations of the field of GRB 120419A 25.7 ks after the INTEGRAL trigger. No optical afterglow, consistent with either the INTEGRAL position or with the candidate X-ray position given above, is detected in the initial UVOT exposures. Preliminary 3-sigma upper limit using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposure is:
Filter T_start(s) T_stop(s) Exp(s) Mag
```
u      25697      26908       1191    >20.5
```
The magnitude in the table is not corrected for the Galactic extinction due to the large but uncertain reddening in the direction of the burst (Schlegel et al. 1998).
This circular is an official product of the Swift-XRT and UVOT teams.
GCN Circular #15210
R.L.C. Starling and K.L. Page (U. Leicester) report on behalf of the Swift XRT team:
Swift performed a further pointing of INTEGRAL-detected burst GRB 120419A (Gotz et al., GCN Circ. 13241), on 10th September 2013 for a total exposure of 3.9 ks.
No source is detected at the position of the X-ray source previously localised with XRT (Page et al., GCN Circ. 13242). We measure an upper limit on the count rate of 2.4e-3 count s^-1. The source has therefore faded and we confirm this as the X-ray afterglow of GRB 120419A.

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Jochen Greiner, last update: 11-Sep-2013 [Disclaimer]