Gamma-ray Burst 100103A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sun 03 Jan 10 17:43:02 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    5970,   Sub_Num: 0
GRB_RA:         112.3938d {+07h 29m 35s} (J2000),
                112.4867d {+07h 29m 57s} (current),
                111.9298d {+07h 27m 43s} (1950)
GRB_DEC:        -34.4509d {-34d 27' 02"} (J2000),
                -34.4722d {-34d 28' 19"} (current),
                -34.3459d {-34d 20' 44"} (1950)
GRB_ERROR:      3.28 [arcmin, radius, statistical only]
GRB_INTEN:      8.13 [sigma]
GRB_TIME:       63762.87 SOD {17:42:42.87} UT
GRB_DATE:       15199 TJD;     3 DOY;   10/01/03
SC_RA:          121.80 [deg] (J2000)
SC_DEC:         -43.60 [deg] (J2000)
SUN_POSTN:      284.38d {+18h 57m 32s}  -22.78d {-22d 46' 43"}
SUN_DIST:       122.23 [deg]   Sun_angle= 11.5 [hr] (West of Sun)
MOON_POSTN:     145.50d {+09h 41m 59s}  +10.88d {+10d 52' 54"}
MOON_DIST:       55.11 [deg]
GAL_COORDS:     247.76, -7.84 [deg] galactic lon,lat of the burst
ECL_COORDS:     123.51,-55.32 [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:    Sun 03 Jan 10 17:43:30 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    5970,   Sub_Num: 1
GRB_RA:         112.3610d {+07h 29m 27s} (J2000),
                112.4539d {+07h 29m 49s} (current),
                111.8972d {+07h 27m 35s} (1950)
GRB_DEC:        -34.4585d {-34d 27' 29"} (J2000),
                -34.4797d {-34d 28' 46"} (current),
                -34.3536d {-34d 21' 12"} (1950)
GRB_ERROR:      2.70 [arcmin, radius, statistical only]
GRB_INTEN:      16.54 [sigma]
GRB_TIME:       63787.87 SOD {17:43:07.87} UT
GRB_DATE:       15199 TJD;     3 DOY;   10/01/03
SC_RA:          121.80 [deg] (J2000)
SC_DEC:         -43.60 [deg] (J2000)
SUN_POSTN:      284.38d {+18h 57m 32s}  -22.78d {-22d 46' 43"}
SUN_DIST:       122.23 [deg]   Sun_angle= 11.5 [hr] (West of Sun)
MOON_POSTN:     145.50d {+09h 42m 00s}  +10.88d {+10d 52' 47"}
MOON_DIST:       55.13 [deg]
GAL_COORDS:     247.75, -7.87 [deg] galactic lon,lat of the burst
ECL_COORDS:     123.47,-55.33 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Possibly real GRB event

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sun 03 Jan 10 17:46:01 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    5970,   Sub_Num: 2
GRB_RA:         112.3601d {+07h 29m 26s} (J2000),
                112.4530d {+07h 29m 49s} (current),
                111.8962d {+07h 27m 35s} (1950)
GRB_DEC:        -34.4529d {-34d 27' 09"} (J2000),
                -34.4741d {-34d 28' 26"} (current),
                -34.3480d {-34d 20' 52"} (1950)
GRB_ERROR:      2.68 [arcmin, radius, statistical only]
GRB_INTEN:      17.43 [sigma]
GRB_TIME:       63796.87 SOD {17:43:16.87} UT
GRB_DATE:       15199 TJD;     3 DOY;   10/01/03
SC_RA:          121.80 [deg] (J2000)
SC_DEC:         -43.60 [deg] (J2000)
SUN_POSTN:      284.38d {+18h 57m 32s}  -22.78d {-22d 46' 42"}
SUN_DIST:       122.24 [deg]   Sun_angle= 11.5 [hr] (West of Sun)
MOON_POSTN:     145.52d {+09h 42m 06s}  +10.87d {+10d 52' 10"}
MOON_DIST:       55.13 [deg]
GAL_COORDS:     247.75, -7.86 [deg] galactic lon,lat of the burst
ECL_COORDS:     123.46,-55.32 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Possibly real GRB event

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sun 03 Jan 10 18:37:12 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    5970,   Sub_Num: 3
GRB_RA:         112.3658d {+07h 29m 28s} (J2000),
                112.4586d {+07h 29m 50s} (current),
                111.9020d {+07h 27m 36s} (1950)
GRB_DEC:        -34.4824d {-34d 28' 55"} (J2000),
                -34.5036d {-34d 30' 12"} (current),
                -34.3775d {-34d 22' 38"} (1950)
GRB_ERROR:      1.60 [arcmin, radius, statistical only]
GRB_INTEN:      17.43 [sigma]
GRB_TIME:       63796.87 SOD {17:43:16.87} UT
GRB_DATE:       15199 TJD;     3 DOY;   10/01/03
SC_RA:          121.80 [deg] (J2000)
SC_DEC:         -43.60 [deg] (J2000)
SUN_POSTN:      284.42d {+18h 57m 42s}  -22.78d {-22d 46' 29"}
SUN_DIST:       122.21 [deg]   Sun_angle= 11.5 [hr] (West of Sun)
MOON_POSTN:     146.02d {+09h 44m 04s}  +10.66d {+10d 39' 28"}
MOON_DIST:       55.24 [deg]
GAL_COORDS:     247.78, -7.87 [deg] galactic lon,lat of the burst
ECL_COORDS:     123.48,-55.35 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       refined_coordinates_after_offline_analysis

GCN Circular #10307
D.Gotz (CEA-Saclay), S.Mereghetti, A. Paizis, (IASF- Milano), E. Bozzo, L. Gibaud, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
a long gamma ray burst has been detected by IBAS in the IBIS/ISGRI data at 17:42:32 U.T. on January 3rd. It lasts about 40 s and its refined coordinates (J2000) are:
```
R.A.:     112.366 [degrees]
DEC.:    -34.482 [degrees]
```
with an uncertainty of 1.6 arcmin (90% c.l.).
A preliminary analysis gives a peak flux in the 20-200 keV range of about 3.5 ph/cmsq/s (1 s integration time) and a fluence over the same energy range of about 3e-6 erg/cmsq.
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 #10308
J. A. Kennea (PSU) and W. H. Baumgartner (GSFC/UMBC) report on behalf of the Swift Team:
Swift began a target of opportunity observation of the INTEGRAL detected GRB 100103A (GCN #10307), at 18:36UT on January 3rd, 2010, approximately 54 mins after the INTEGRAL detection. In approximately 2.5 ks of Photon Counting mode data, we find an uncatalogued source in the XRT field of view with a preliminary position of RA, Dec (J2000) = 112.37327, -34.487811, which is equivalent to:
```
RA(J2000)  =  07h 29m 29.5s
Dec(J2000) = -34d 29' 16.1"
```
with an estimated uncertainty of 6 arcmins radius (90% confidence). This position lies 0.5 arcmins from the INTEGRAL reported position. We currently cannot confirm if this source is fading.
GCN Circular #10309
J. A. Kennea (PSU) and W. H. Baumgartner (GSFC/UMBC) report on behalf of the Swift Team:
The position error in GCN #10308 should be "6 arcseconds radius (90% confidence)". We apologize for the error.
GCN Circular #10310
M. M. Chester (PSU), M. H. Siegel (PSU), S. Immler (NASA/CRESST/GSFC), and W. H. Baumgartner (GSFC/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began observing the INTEGRAL-detected GRB 100103A (D.Gotz, et al., GCN Circ. 10307) at 18:36UT on January 3rd, 2010, approximately 54 mins after the INTEGRAL detection. No optical afterglow consistent with the Swift/XRT candidate (J. Kennea, et al., GCN Circ. 10308) is detected in the UVOT exposures. Preliminary 3- sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) are:
```
Filter    T_start(s)   T_stop(s)   Exp(s)      Mag
----------------------------------------------------------------
v         3244         4409        1165       >20.44
u         4418         5554        1136       >20.70
```
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.29 in the direction of the XRT candidate (Schlegel et al. 1998).
GCN Circular #10311
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report:
The long GRB 100103A (Gotz et al., GCN 10307) triggered Konus-Wind at T0=63766.807s UT (17:42:46.807).
The burst light curve shows a single-pulse structure with a duration of ~50 s. There is a hint of the soft extended emission which lasts to ~250 s after T0. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB100103_T63766/
As observed by Konus-Wind the burst had a fluence of 1.2(+/-0.2)x10-5 erg/cm2, and a 256-ms peak flux measured from T0+7.168s of 0.9(+/-0.1)x10-6 erg/cm2/s (both in the 20 keV - 2 MeV energy range).
The time-integrated spectrum of the burst (from T0 to T0+41.216 s) is well fitted in the 20 keV - 2 MeV range by GRB (Band) model for which: the low-energy photon index alpha = -0.91 (-0.38,+0.63), the high energy photon index beta = -2.2(<-1.9), the peak energy Ep = 157(-51, +83)keV (chi2 = 45/57 dof).
The spectrum of the most intense part of the burst (from T0 to T0+8.448 s) is well fitted in the 20 keV - 2 MeV range by GRB (Band) model for which: the low-energy photon index alpha = -0.82 (-0.25,+0.28), the high energy photon index beta = -2.7(<-2.2), the peak energy Ep = 204(-38, +56)keV (chi2 = 54.8/57 dof).
All the quoted values are preliminary. All the quoted errors are at the 90% confidence level.
GCN Circular #10312
K.L. Page, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team:
Using 3971 s of XRT Photon Counting mode data and 2 UVOT images for the INTEGRAL burst GRB 100103A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 112.37270, -34.49020 which is equivalent to:
```
RA (J2000):  07 29 29.46
Dec (J2000): -34 29 24.9
```
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular is an official product of the Swift-XRT team.
GCN Circular #10313
K.L. Page (U. Leicester) and W.H. Baumgartner (GSFC/UMBC) report on behalf of the Swift-XRT team:
We have analysed 8 ks of XRT data for the INTEGRAL GRB 100103A (Gotz et al. GCN Circ. 10307) obtained during two observations, from 3.3-10.3 ks and 196-224 ks after the trigger. The source found by Kennea & Baumgartner (GCN Circ. 10308; improved position given by Page et al. in GCN Circ. 10312) is now clearly fading, with a decay slope of alpha = 0.87 (+0.14, -0.10). We therefore confirm that this is, indeed, the X-ray afterglow.
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.86 (+0.32, -0.30). The best-fitting absorption column is 6.5 (+1.3, -0.7) x 10^21 cm^-2, in excess of the Galactic value of 2.4 x 10^21 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.9 x 10^-11 (1.7 x 10^-10) erg cm^-2 count^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020125.
This circular is an official product of the Swift-XRT team.
GCN Circular #10314
R. Filgas, F. Olivares, J. Greiner, T. Kruehler (all MPE Garching) and S. Klose (Tautenburg Observatory) report on behalf of the GROND team:
We observed the field of GRB 100103A (INTEGRAL trigger #5970; Gotz et al., GCN #10307) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP, 120, 405) mounted at the 2.2 m ESO/MPI telescope at La Silla Observatory (Chile). Observations started on January 4, 2010 at 00:48 UT, 7.1 hours after the GRB trigger. They were performed at variable seeing of 2-3" and at an average airmass of 1.4.
No source is found within the 1.7" XRT error circle (Page et al., GCN #10312). Comparison to the Digital Sky Survey and 2MASS also reveals no new sources within a 10 arcsec surrounding. Co-added images of 24.6 min of integration time in g'r'i'z' and 20 min in JHK, centered at 01:29 UT yield the following specific upper limits (AB system):
```
g' > 24.9
r' > 24.2
i' > 23.6
z' > 23.8
J > 21.2 
H > 20.6 
K > 19.2 
```
calibrated against USNO and 2MASS field stars. No correction for the Galactic foreground extinction was made, which correspond to a reddening of E(B-V)=0.29 mag in the direction of the burst (Schlegel et al. 1998).

Back to JG's homepage

Jochen Greiner, last update: 03-Jan-2010 [Disclaimer]