Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
95.8345 -0.1048 0.0139 26.1701 66.0786 0.1144589 13.879 TRIG_00333320
Foreground time interval of the image:
0.000 0.220 (delta_t = 0.220 [sec])
Background time interval of the image:
-239.200 0.000 (delta_t = 239.200 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
8 ms binning
From T100_start-3 s to T100_start+3 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
2 ms binning
From T100_start-1 s to T100_start+1 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Quad-rate summed light curves (from T0-300s to T0+1000s)
Spectral Evolution
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from 0.000 sec. to 0.220 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06982 ( -0.203647 0.200171 )
Norm@50keV : 3.09313E-02 ( -0.00411603 0.00411582 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.83 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 57 degrees of freedom
# Null hypothesis probability = 1.750087e-01
Photon flux (15-150 keV) in 0.22 sec: 3.57807 ( -0.48075 0.481055 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.18487e-08 ( -1.05506e-08 1.063e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.220 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.253557 ( -1.1892 0.935964 )
Epeak [keV] : 91.2407 ( -21.0997 88.3746 )
Norm@50keV : 0.134134 ( -0.0852733 0.32405 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.60 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 56 degrees of freedom
# Null hypothesis probability = 3.135248e-01
Photon flux (15-150 keV) in 0.22 sec: 3.50753 ( -0.48611 0.48576 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.80526e-08 ( -1.10563e-08 1.12011e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.220 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.328885 ( -0.998862 -0.331615 )
beta : -2.32800 ( 2.33114 1.23367 )
Epeak [keV] : 87.8281 ( -54.8937 83.3065 )
Norm@50keV : 0.147799 ( -0.148165 189.938 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.50 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 55 degrees of freedom
# Null hypothesis probability = 2.841453e-01
Photon flux (15-150 keV) in 0.22 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] : 19.3177 (-2.58532 3.11199)
R^2/D10^2 : 0.206387 (-0.0802004 0.122949)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.11 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 57 degrees of freedom
# Null hypothesis probability = 2.692218e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.310e-09 7.997e-10
25- 50 1.611e-08 3.003e-09
50-150 4.431e-08 1.065e-08
15-150 6.373e-08 1.122e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 14.1096 (-1.96978 1.96978)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.88 using 59 PHA bins.
# Reduced chi-squared = 1.384 for 57 degrees of freedom
# Null hypothesis probability = 2.907732e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.775e-09 4.411e-09
25- 50 1.496e-08 8.369e-09
50-150 3.280e-08 1.841e-08
15-150 5.553e-08 3.105e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.96535 (-3.85048 -6.97063)
R1^2/D10^2 : 1.54266 (-1.4935 9.81508)
kT2 [keV] : 22.8417 (-5.99094 -22.8443)
R2^2/D10^2 : 0.106160 (-0.103329 0.133953)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.10 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 55 degrees of freedom
# Null hypothesis probability = 2.964111e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.847e-09 2.693e-09
25- 50 1.554e-08 7.690e-09
50-150 4.726e-08 2.666e-08
15-150 6.765e-08 3.549e-08
Peak spectrum fit
Power-law model
Time interval is from -0.388 sec. to 0.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14223 ( -0.276382 0.269689 )
Norm@50keV : 8.65152E-03 ( -0.00146113 0.00146083 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.35 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 57 degrees of freedom
# Null hypothesis probability = 1.263718e-01
Photon flux (15-150 keV) in 1 sec: 1.00803 ( -0.173789 0.174299 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.92732e-08 ( -1.64219e-08 1.66331e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.388 sec. to 0.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.535215 ( -1.93755 1.31741 )
Epeak [keV] : 82.7980 ( -19.2983 95.9477 )
Norm@50keV : 5.10017E-02 ( -0.051002 0.281892 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.25 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 56 degrees of freedom
# Null hypothesis probability = 2.098547e-01
Photon flux (15-150 keV) in 1 sec: 0.944247 ( -0.182394 0.182253 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.18683e-08 ( -1.70624e-08 1.7701e-08 ) ergs/cm2
Band function
Time interval is from -0.388 sec. to 0.612 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.534120 ( -1.37439 1.92757 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 82.8248 ( -16.9965 95.7282 )
Norm@50keV : 5.09324E-02 ( -0.0509324 0.282259 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.25 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 55 degrees of freedom
# Null hypothesis probability = 1.840587e-01
Photon flux (15-150 keV) in 1 sec: 0.967436 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.56958e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.0695 (-3.18371 4.08765)
R^2/D10^2 : 5.80197E-02 (-0.0275754 0.048461)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.87 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 57 degrees of freedom
# Null hypothesis probability = 2.214077e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.142e-09 1.386e-09
25- 50 1.997e-08 5.450e-09
50-150 5.341e-08 1.769e-08
15-150 7.753e-08 2.163e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.15158 (-0.718287 0.718238)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.85 using 59 PHA bins.
# Reduced chi-squared = 1.296 for 57 degrees of freedom
# Null hypothesis probability = 6.606497e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.034e-08 5.965e-09
25- 50 1.990e-08 1.125e-08
50-150 4.363e-08 2.461e-08
15-150 7.387e-08 4.343e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.25803 (-5.25803 -5.25803)
R1^2/D10^2 : 0.885680 (-0.885614 -0.885614)
kT2 [keV] : 20.7289 (-4.23745 -20.7289)
R2^2/D10^2 : 4.18716E-02 (-0.0418703 0.0513648)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.81 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 55 degrees of freedom
# Null hypothesis probability = 1.945149e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.041e-09 3.579e-09
25- 50 1.936e-08 1.075e-08
50-150 5.584e-08 3.304e-08
15-150 8.124e-08 4.473e-08
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: 1.06982 ( -0.203647 0.200171 )
Norm@50keV : 3.09313E-02 ( -0.00411603 0.00411582 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.83 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 57 degrees of freedom
# Null hypothesis probability = 1.750087e-01
Photon flux (15-150 keV) in 0.22 sec: 3.57807 ( -0.48075 0.481055 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.18487e-08 ( -1.05506e-08 1.063e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.253557 ( -1.1892 0.935964 )
Epeak [keV] : 91.2407 ( -21.0997 88.3746 )
Norm@50keV : 0.134134 ( -0.0852733 0.32405 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.60 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 56 degrees of freedom
# Null hypothesis probability = 3.135248e-01
Photon flux (15-150 keV) in 0.22 sec: 3.50753 ( -0.48611 0.48576 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.80526e-08 ( -1.10563e-08 1.12011e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.328885 ( -0.998862 -0.331615 )
beta : -2.32800 ( 2.33114 1.23383 )
Epeak [keV] : 87.8281 ( -54.8937 83.3065 )
Norm@50keV : 0.147799 ( -0.148165 189.938 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.50 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 55 degrees of freedom
# Null hypothesis probability = 2.841453e-01
Photon flux (15-150 keV) in 0.22 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) = 1.39e-08
S(50-100 keV) = 2.65e-08
T90 vs. Hardness ratio plot
T90 = 0.180000007152557 sec.
Hardness ratio (energy fluence ratio) = 1.90647
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 2.10934
Count Ratio (50-100 keV) / (15-25 keV) = 2.24588
Mask shadow pattern
IMX = 1.992596715391991E-01, IMY = -4.492014886940798E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
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:
-239.200000 0.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5256 -40.5548 0.4 44.6 -33.8 10.9291 29.9 0.1 Vela X-1
100.2705 35.9513 2.1 39.2 132.8 2.1536 5.3 ------ UNKNOWN
127.8902 -51.2528 2.4 53.8 -23.7 2.5189 4.7 ------ UNKNOWN
148.9791 -41.6236 2.6 50.3 -45.3 3.7996 4.4 ------ UNKNOWN
153.3337 -32.8253 2.5 46.0 -56.6 3.6229 4.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.000000 0.220000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.2844 -40.6743 0.0 44.7 -33.5 -0.0199 -2.0 13.2 Vela X-1
81.5817 -29.8362 2.5 50.1 28.0 0.1220 4.6 ------ UNKNOWN
95.8345 -0.1049 0.8 26.2 66.1 0.1144 13.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
980.900600 1055.682400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4955 -40.5505 1.2 34.3 138.4 3.7998 10.0 1.5 Vela X-1
170.4640 -60.7438 15.5 8.8 88.0 0.1742 0.7 8.5 Cen X-3
186.6516 -62.8090 2.8 8.0 32.0 0.9377 4.1 2.3 GX 301-2
255.9792 -37.8676 252.0 50.5 -34.3 0.0373 0.0 1.4 4U 1700-377
256.4460 -36.4503 77.0 51.7 -35.2 -0.1336 -0.1 1.7 GX 349+2
264.7040 -44.4312 8.3 50.7 -22.2 -0.8024 -1.4 2.0 4U 1735-44
281.1253 -61.8242 2.3 46.8 3.8 2.2399 4.9 ------ UNKNOWN
262.9143 -61.3925 2.8 39.8 -3.7 1.3110 4.1 ------ UNKNOWN
163.3376 -25.8402 2.8 32.6 -170.8 0.9817 4.1 ------ UNKNOWN
151.3213 -5.5852 2.6 55.6 -175.8 4.7632 4.5 ------ UNKNOWN
247.9761 -52.6281 2.5 37.0 -22.3 1.3422 4.6 ------ UNKNOWN
230.9992 -27.9788 3.0 43.6 -64.6 4.0927 3.9 ------ UNKNOWN
Plot creation:
Sun May 31 05:39:46 EDT 2015