Click here for the BAT GCN circular template
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
250.4730 -45.5520 0.0427 5.9 141.3 1.6718 4.5 TRIG_00571067
------------------------------------------
Foreground time interval of the image:
0.000 226.910 (delta_t = 226.910 [sec])
228.000 448.000 (delta_t = 220.000 [sec])
Background time interval of the image:
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
The mask-weighted light curves based on cleaned DPHs
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 226.910000
228.000000 448.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.05085 ( -0.393273 0.458021 )
Norm@50keV : 1.27917E-04 ( -4.42697e-05 4.84576e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.73 using 59 PHA bins.
# Reduced chi-squared = 0.9075 for 57 degrees of freedom
# Null hypothesis probability = 6.726287e-01
Photon flux (15-150 keV) in 446.9 sec: 3.65113E-02 ( -0.00591709 0.00592404 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.03407e-07 ( -1.39749e-07 1.50073e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 226.910000
228.000000 448.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.616757 ( )
Epeak [keV] : 15.9648 ( )
Norm@50keV : 7.14585E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.84 using 59 PHA bins.
# Reduced chi-squared = 0.8543 for 56 degrees of freedom
# Null hypothesis probability = 7.728347e-01
Photon flux (15-150 keV) in 446.9 sec: 3.53072E-02 ( -0.0057793 0.0057496 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.09107e-07 ( -1.12418e-07 1.29579e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 226.910000
228.000000 448.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.226751 ( -1.59062 0.349888 )
beta : -9.99739 ( 9.99739 19.9951 )
Epeak [keV] : 17.5499 ( -6.50156 5.58023 )
Norm@50keV : 1.36957E-02 ( -0.0136957 49.8424 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.72 using 59 PHA bins.
# Reduced chi-squared = 0.8677 for 55 degrees of freedom
# Null hypothesis probability = 7.462487e-01
Photon flux (15-150 keV) in 446.9 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.41746 (-0.806135 0.931671)
R^2/D10^2 : 0.214906 (-0.111207 0.243004)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.18 using 59 PHA bins.
# Reduced chi-squared = 0.8452 for 57 degrees of freedom
# Null hypothesis probability = 7.910141e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.185e-07 9.751e-08
25- 50 2.522e-07 8.909e-08
50-150 1.490e-08 1.004e-08
15-150 5.857e-07 1.682e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.1628 (-4.71271 6.88858)
Norm : 0.540361 (-0.190183 0.300485)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.36 using 59 PHA bins.
# Reduced chi-squared = 0.8484 for 57 degrees of freedom
# Null hypothesis probability = 7.854804e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.250e-07 8.102e-08
25- 50 2.509e-07 7.208e-08
50-150 5.738e-08 3.678e-08
15-150 6.333e-07 1.700e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.317 ( )
R1^2/D10^2 : 8.19524E-07 (-8.1918e-07 0.000294417)
kT2 [keV] : 5.34630 (-0.802274 0.933589)
R2^2/D10^2 : 0.226588 (-0.117875 0.259246)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.75 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.68 using 59 PHA bins.
# Reduced chi-squared = 0.8681 for 55 degrees of freedom
# Reduced chi-squared = 0.8669 for 55 degrees of freedom
# Null hypothesis probability = 7.454857e-01
# Null hypothesis probability = 7.476528e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.229e-07 3.193e-07
25- 50 2.543e-07 3.577e-07
50-150 3.404e-08 5.081e-08
15-150 6.112e-07 6.252e-07
Peak spectrum fit
Power-law model
Time interval is from 228.000 sec. to 448.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.05085 ( -0.393273 0.458021 )
Norm@50keV : 1.27917E-04 ( -4.42697e-05 4.84576e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.73 using 59 PHA bins.
# Reduced chi-squared = 0.9075 for 57 degrees of freedom
# Null hypothesis probability = 6.726287e-01
Photon flux (15-150 keV) in 446.9 sec: 3.65113E-02 ( -0.00591709 0.00592404 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.03407e-07 ( -1.39749e-07 1.50073e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 228.000 sec. to 448.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.616757 ( )
Epeak [keV] : 15.9648 ( )
Norm@50keV : 7.14585E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.84 using 59 PHA bins.
# Reduced chi-squared = 0.8543 for 56 degrees of freedom
# Null hypothesis probability = 7.728347e-01
Photon flux (15-150 keV) in 446.9 sec: 3.53072E-02 ( -0.0057793 0.0057496 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.09107e-07 ( -1.12418e-07 1.29579e-07 ) ergs/cm2
Band function
Time interval is from 228.000 sec. to 448.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -4.27771E-02 ( -1.30189 0.42913 )
beta : -9.99965 ( 9.99965 0.000447204 )
Epeak [keV] : 18.1248 ( -5.76486 4.70783 )
Norm@50keV : 1.86705E-02 ( -0.00294941 46.1451 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.70 using 59 PHA bins.
# Reduced chi-squared = 0.8672 for 55 degrees of freedom
# Null hypothesis probability = 7.470962e-01
Photon flux (15-150 keV) in 446.9 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.41746 (-0.806135 0.931671)
R^2/D10^2 : 0.214906 (-0.111207 0.243004)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.18 using 59 PHA bins.
# Reduced chi-squared = 0.8452 for 57 degrees of freedom
# Null hypothesis probability = 7.910141e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.185e-07 1.119e-07
25- 50 2.522e-07 9.354e-08
50-150 1.490e-08 1.066e-08
15-150 5.857e-07 1.707e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.1628 (-4.71271 6.88858)
Norm : 0.540361 (-0.190183 0.300485)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.36 using 59 PHA bins.
# Reduced chi-squared = 0.8484 for 57 degrees of freedom
# Null hypothesis probability = 7.854804e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.250e-07 7.387e-08
25- 50 2.509e-07 8.346e-08
50-150 5.738e-08 3.715e-08
15-150 6.333e-07 1.492e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.317 ( )
R1^2/D10^2 : 8.19524E-07 (-8.1918e-07 0.000294417)
kT2 [keV] : 5.34630 (-0.802274 0.933589)
R2^2/D10^2 : 0.226588 (-0.117875 0.259246)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.75 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.68 using 59 PHA bins.
# Reduced chi-squared = 0.8681 for 55 degrees of freedom
# Reduced chi-squared = 0.8669 for 55 degrees of freedom
# Null hypothesis probability = 7.454857e-01
# Null hypothesis probability = 7.476528e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.229e-07 3.280e-07
25- 50 2.543e-07 3.278e-07
50-150 3.404e-08 5.495e-08
15-150 6.112e-07 5.731e-07
Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)
Power-law model
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.05085 ( -0.393273 0.458021 )
Norm@50keV : 1.27917E-04 ( -4.42697e-05 4.84576e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.73 using 59 PHA bins.
# Reduced chi-squared = 0.9075 for 57 degrees of freedom
# Null hypothesis probability = 6.726287e-01
Photon flux (15-150 keV) in 446.9 sec: 3.65113E-02 ( -0.00591709 0.00592404 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.03407e-07 ( -1.39749e-07 1.50073e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.616757 ( )
Epeak [keV] : 15.9648 ( )
Norm@50keV : 7.14585E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.84 using 59 PHA bins.
# Reduced chi-squared = 0.8543 for 56 degrees of freedom
# Null hypothesis probability = 7.728347e-01
Photon flux (15-150 keV) in 446.9 sec: 3.53072E-02 ( -0.0057793 0.0057496 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.09107e-07 ( -1.12418e-07 1.29579e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.121062 ( -1.69952 -0.121064 )
beta : -9.23115 ( 9.14514 19.1351 )
Epeak [keV] : 18.7187 ( -5.91992 4.1247 )
Norm@50keV : 2.40907E-02 ( -0.0140392 195.956 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.69 using 59 PHA bins.
# Reduced chi-squared = 0.8671 for 55 degrees of freedom
# Null hypothesis probability = 7.472464e-01
Photon flux (15-150 keV) in 446.9 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.3349e-07
S(50-100 keV) = 1.12717e-07
T90 vs. Hardness ratio plot
T90 = 448 sec.
Hardness ratio (energy fluence ratio) = 0.482749
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.655419
Count Ratio (50-100 keV) / (15-25 keV) = -0.0215117
Mask shadow pattern
IMX = -8.024515953094336E-02, IMY = -6.434944896646513E-02
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.000000 226.910000
228.000000 448.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.5246 -60.6958 5.0 48.6 -147.5 -2.6475 -2.3 7.5 Cen X-3
186.6514 -62.6065 17.9 40.9 -149.5 -0.4372 -0.6 9.8 GX 301-2
244.9793 -15.6406 0.2 25.0 -9.1 28.4281 71.5 0.0 Sco X-1
256.0183 -37.7132 10.8 8.3 65.7 0.3751 1.1 8.0 4U 1700-377
256.5443 -36.4318 2.8 9.2 59.5 1.4736 4.1 5.3 GX 349+2
262.9710 -24.6684 2.6 21.3 40.0 1.6906 4.4 5.1 GX 1+4
264.8528 -44.5874 226.7 14.4 105.4 0.0187 0.1 9.5 4U 1735-44
268.2622 -1.3003 9.2 44.2 26.2 1.0099 1.2 11.1 SW J1753.5-0127
270.3431 -25.1007 2.1 25.5 53.2 2.4174 5.4 3.5 GX 5-1
270.4878 -25.8590 6.4 25.1 54.7 0.7753 1.8 12.2 GRS 1758-258
274.0676 -14.0522 3.6 36.1 44.0 2.0963 3.2 3.7 GX 17+2
275.8584 -30.2733 3.1 26.3 69.5 1.8951 3.8 6.6 H1820-303
285.0254 -24.9138 38.6 36.0 69.6 -0.2524 -0.3 0.7 HT1900.1-2455
262.8169 -33.8583 75.8 15.0 61.6 -0.0554 -0.2 8.7 GX 354-0
304.8416 -63.9571 2.5 40.7 138.2 4.4266 4.6 ------ UNKNOWN
274.3944 -16.1569 2.7 34.7 46.7 2.6315 4.4 ------ UNKNOWN
255.6434 -48.7662 1.5 10.6 136.5 2.6760 8.0 ------ UNKNOWN
253.3197 -18.8235 3.9 22.7 11.4 1.0602 3.0 ------ UNKNOWN
225.7450 -73.4238 2.8 34.2 -176.6 1.8584 4.1 ------ UNKNOWN
231.0977 6.8463 2.3 49.4 -26.4 4.4711 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
557.100590 903.106600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
275.8897 -30.4223 4.4 54.6 -22.4 1.8657 2.6 3.8 H1820-303
285.0713 -24.9048 25.3 51.2 -10.8 -0.2319 -0.5 2.1 HT1900.1-2455
24.6065 -12.7542 2.8 46.2 139.2 3.4719 4.1 ------ UNKNOWN
316.7419 -6.1885 2.6 44.4 37.1 2.5606 4.5 ------ UNKNOWN
54.6741 -29.3828 3.0 56.7 179.0 5.5293 3.8 ------ UNKNOWN
351.9163 -47.7161 3.0 6.9 -150.0 0.7258 3.8 ------ UNKNOWN
67.3586 -71.6612 3.0 47.2 -127.0 3.7604 3.9 ------ UNKNOWN
Plot creation:
Wed Sep 18 03:21:38 EDT 2013