Gamma-ray Burst 081003

(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 03 Oct 08 13:46:27 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    5360,   Sub_Num: 0
GRB_RA:         262.3869d {+17h 29m 33s} (J2000),
                262.4847d {+17h 29m 56s} (current),
                261.8286d {+17h 27m 19s} (1950)
GRB_DEC:        +16.5826d {+16d 34' 57"} (J2000),
                +16.5762d {+16d 34' 34"} (current),
                +16.6208d {+16d 37' 15"} (1950)
GRB_ERROR:      2.93 [arcmin, radius, statistical only]
GRB_INTEN:      11.09 [sigma]
GRB_TIME:       49572.58 SOD {13:46:12.58} UT
GRB_DATE:       14742 TJD;   277 DOY;   08/10/03
SC_RA:          264.77 [deg] (J2000)
SC_DEC:          18.40 [deg] (J2000)
SUN_POSTN:      189.85d {+12h 39m 25s}   -4.24d {-04d 14' 32"}
SUN_DIST:        74.68 [deg]   Sun_angle= -4.8 [hr] (East of Sun)
MOON_POSTN:     235.98d {+15h 43m 56s}  -24.84d {-24d 50' 19"}
MOON_DIST:       48.81 [deg]
GAL_COORDS:      39.36, 25.37 [deg] galactic lon,lat of the burst
ECL_COORDS:     260.49, 39.77 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Possibly real GRB event

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 03 Oct 08 13:46:45 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    5360,   Sub_Num: 1
GRB_RA:         259.8191d {+17h 19m 17s} (J2000),
                259.9070d {+17h 19m 38s} (current),
                259.3171d {+17h 17m 16s} (1950)
GRB_DEC:        +26.8171d {+26d 49' 01"} (J2000),
                +26.8085d {+26d 48' 31"} (current),
                +26.8675d {+26d 52' 03"} (1950)
GRB_ERROR:      2.87 [arcmin, radius, statistical only]
GRB_INTEN:      12.12 [sigma]
GRB_TIME:       49589.75 SOD {13:46:29.75} UT
GRB_DATE:       14742 TJD;   277 DOY;   08/10/03
SC_RA:          264.77 [deg] (J2000)
SC_DEC:          18.40 [deg] (J2000)
SUN_POSTN:      189.85d {+12h 39m 25s}   -4.24d {-04d 14' 32"}
SUN_DIST:        74.32 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:     235.99d {+15h 43m 57s}  -24.84d {-24d 50' 21"}
MOON_DIST:       56.57 [deg]
GAL_COORDS:      49.37, 31.10 [deg] galactic lon,lat of the burst
ECL_COORDS:     255.87, 49.76 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Possibly real GRB event

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 03 Oct 08 13:49:26 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    5360,   Sub_Num: 2
GRB_RA:         262.3968d {+17h 29m 35s} (J2000),
                262.4946d {+17h 29m 59s} (current),
                261.8385d {+17h 27m 21s} (1950)
GRB_DEC:        +16.5748d {+16d 34' 29"} (J2000),
                +16.5684d {+16d 34' 06"} (current),
                +16.6130d {+16d 36' 47"} (1950)
GRB_ERROR:      2.77 [arcmin, radius, statistical only]
GRB_INTEN:      14.33 [sigma]
GRB_TIME:       49576.75 SOD {13:46:16.75} UT
GRB_DATE:       14742 TJD;   277 DOY;   08/10/03
SC_RA:          264.77 [deg] (J2000)
SC_DEC:          18.40 [deg] (J2000)
SUN_POSTN:      189.86d {+12h 39m 25s}   -4.24d {-04d 14' 35"}
SUN_DIST:        74.69 [deg]   Sun_angle= -4.8 [hr] (East of Sun)
MOON_POSTN:     236.01d {+15h 44m 02s}  -24.84d {-24d 50' 37"}
MOON_DIST:       48.80 [deg]
GAL_COORDS:      39.36, 25.36 [deg] galactic lon,lat of the burst
ECL_COORDS:     260.50, 39.76 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Possibly real GRB event

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 03 Oct 08 14:31:45 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    5360,   Sub_Num: 3
GRB_RA:         262.3758d {+17h 29m 30s} (J2000),
                262.4736d {+17h 29m 54s} (current),
                261.8174d {+17h 27m 16s} (1950)
GRB_DEC:        +16.5658d {+16d 33' 57"} (J2000),
                +16.5594d {+16d 33' 34"} (current),
                +16.6041d {+16d 36' 15"} (1950)
GRB_ERROR:      2.00 [arcmin, radius, statistical only]
GRB_INTEN:      14.33 [sigma]
GRB_TIME:       49576.75 SOD {13:46:16.75} UT
GRB_DATE:       14742 TJD;   277 DOY;   08/10/03
SC_RA:          264.77 [deg] (J2000)
SC_DEC:          18.40 [deg] (J2000)
SUN_POSTN:      189.88d {+12h 39m 32s}   -4.25d {-04d 15' 15"}
SUN_DIST:        74.64 [deg]   Sun_angle= -4.8 [hr] (East of Sun)
MOON_POSTN:     236.39d {+15h 45m 34s}  -24.92d {-24d 54' 55"}
MOON_DIST:       48.65 [deg]
GAL_COORDS:      39.34, 25.37 [deg] galactic lon,lat of the burst
ECL_COORDS:     260.48, 39.75 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       refined_coordinates_after_offline_analysis

GCN Circular #8314
S.Mereghetti, A.Paizis (IASF-Milano), D.Gotz (CEA-Saclay), F. Fontani, V.Beckmann, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
A GRB lasting about 30 s has been detected by IBAS in IBIS/ISGRI data at 13:46:12 UT of October 3. The coordinates (J2000) are:
```
RA = 262.3758 [degrees]
DEC= 16.566 [degrees]
```
with an uncertainty of 2 arcmin (90% c.l.).
A preliminary analysis gives a peak flux in the 20-200 keV range of about 0.3 ph/cmq/s (1-s integration time) and a fluence over the same energy range of about 4x10e-7 erg/cmq.
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
This message can be cited.
GCN Circular #8319
K.L. Page, A.P. Beardmore (U. Leicester) and H.A. Krimm (CRESST/GSFC/USRA) report on behalf of the Swift-XRT team:
Swift began observing the field of the INTEGRAL GRB 081003A (Mereghetti et al., GCN Circ. 8314) 7.6 ks after the trigger. In 1.8 ks of Photon Counting mode data, we detect a single source within the INTEGRAL error circle at a position of RA, Dec = 262.39082, 16.57103, which is equivalent to
```
RA(J2000):   17 29 33.80
Dec(J2000): +16 34 15.70
```
with an uncertainty of 3.9 arcsec (radius, 90% containment). The source has a count rate of ~0.026 during this observation.
The spectrum of the source can be fitted by an absorbed power-law, with Gamma = 3.6 +1.6/-1.2 and NH = (7 +6/-4)x10^21 cm^-2, compared to the Galctic value of 6.67x10^20 cm^-2. It is not possible to determine whether this source is fading given the current statistics.
This circular is an official product of the Swift-XRT team.
GCN Circular #8323
A. de Ugarte Postigo (ESO, Santiago), F. J. Aceituno, M. Jel=EDnek, J. Gorosabel and A.J. Castro-Tirado (IAA-CSIC, Granada) on behalf of a larger collaboration report:
"We have observed the field of GRB 081003A detected by INTEGRAL (Mereghetti et al. GCN 8314) with the 1.5m OSN telescope at Sierra Nevada Observatory (Granada, Spain). The observations consisted of 6x300s in I-band, 2x300s in R-band and 2x300s in V-band (5.07, 6.17 and 5.31h after the burst trigger respectively). We do not detect any new optical source within the Swift/XRT error box (Page et al. GCN 8319) down to 3-sigma limiting magnitudes of I > 22.0 and R > 22.5. We note, however that there could be a marginal object (with low S/N significance in the I-band frame) at coordinates (J2000): R.A.: 17:29:33.85, Dec.: +16:34:14.1 (+/-0.7"), consistent with the XRT error box. Deeper observations would be needed in order to confirm the reality of this source."
1302.0560 from 5 Feb 13
A. Martin-Carrillo et al.: X-ray behaviour of GRBs detected by INTEGRAL/JEM-X
INTEGRAL's JEM-X instrument offers a very rare opportunity to observe the full prompt X-ray emission from GRBs and the transition to the afterglow phase. A study of prompt X-ray flares in some bursts from the INTEGRAL GRB sample and the early X-ray post-GRB emission from 3-35 keV is presented here. Significant post-GRB emission above 10 keV is observed for GRB 041219A and GRB 081003A.

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Jochen Greiner, last update: 05-Feb-2013 [Disclaimer]