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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
258.5514 -13.0628 0.0090 30.8863 22.3375 2.2051270 21.397 TRIG_00517489
Foreground time interval of the image:
-15.044 22.652 (delta_t = 37.696 [sec])
Background time interval of the image:
-239.816 -15.044 (delta_t = 224.772 [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 1.024000
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 1.024000
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 1.024000
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)
The mask-weighted light curves based on cleaned DPHs
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 -15.044 sec. to 22.652 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94277 ( -0.132806 0.136329 )
Norm@50keV : 3.00077E-03 ( -0.000261146 0.000257783 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.72 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 57 degrees of freedom
# Null hypothesis probability = 3.432357e-01
Photon flux (15-150 keV) in 37.7 sec: 0.438676 ( -0.0324377 0.0324639 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04088e-06 ( -8.7424e-08 8.84695e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.044 sec. to 22.652 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24283 ( -0.712132 0.594492 )
Epeak [keV] : 44.9236 ( -10.2382 27.2601 )
Norm@50keV : 7.60931E-03 ( -0.00410221 0.0121207 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.60 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 56 degrees of freedom
# Null hypothesis probability = 4.525473e-01
Photon flux (15-150 keV) in 37.7 sec: 0.425871 ( -0.034144 0.034136 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.64615e-07 ( -1.03867e-07 1.07928e-07 ) ergs/cm2
Band function
Time interval is from -15.044 sec. to 22.652 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99005 ( -14.7973 -4.99005 )
beta : -2.15254 ( -0.227321 0.174815 )
Epeak [keV] : 24.7438 ( -3.38949 2.76888 )
Norm@50keV : 498.124 ( -36.0068 830.475 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.05 using 59 PHA bins.
# Reduced chi-squared = 0.9463 for 55 degrees of freedom
# Null hypothesis probability = 5.882388e-01
Photon flux (15-150 keV) in 37.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.82368e-07 ( -9.82104e-07 -9.60558e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.0482 (-0.813821 0.898301)
R^2/D10^2 : 0.200761 (-0.0570132 0.0782698)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.91 using 59 PHA bins.
# Reduced chi-squared = 1.454 for 57 degrees of freedom
# Null hypothesis probability = 1.413034e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.559e-07 1.872e-08
25- 50 3.902e-07 3.044e-08
50-150 2.065e-07 4.256e-08
15-150 7.526e-07 6.296e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 71.2265 (-14.84 21.6844)
Norm : 2.14294 (-0.249648 0.289701)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.49 using 59 PHA bins.
# Reduced chi-squared = 0.9910 for 57 degrees of freedom
# Null hypothesis probability = 4.943019e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.076e-07 2.074e-08
25- 50 3.319e-07 2.505e-08
50-150 4.318e-07 8.134e-08
15-150 9.714e-07 9.463e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.34823 ( )
R1^2/D10^2 : 0.532703 (-0.218656 0.480705)
kT2 [keV] : 27.2133 (-9.17788 29.9646)
R2^2/D10^2 : 2.75231E-03 (-0.0024587 0.00860919)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.21 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.48 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Reduced chi-squared = 0.9541 for 55 degrees of freedom
# Null hypothesis probability = 4.665686e-01
# Null hypothesis probability = 5.716118e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.983e-07 8.452e-08
25- 50 3.275e-07 1.410e-07
50-150 3.787e-07 2.074e-07
15-150 9.045e-07 3.693e-07
Peak spectrum fit
Power-law model
Time interval is from 9.044 sec. to 10.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11979 ( -0.231661 0.249563 )
Norm@50keV : 9.14607E-03 ( -0.00168764 0.00166096 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.10 using 59 PHA bins.
# Reduced chi-squared = 1.423 for 57 degrees of freedom
# Null hypothesis probability = 1.966278e-02
Photon flux (15-150 keV) in 1 sec: 1.45314 ( -0.205879 0.205886 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.51273e-08 ( -1.4112e-08 1.45035e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.044 sec. to 10.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.02013 ( -2.09085 1.57065 )
Epeak [keV] : 37.0163 ( -5.00484 5.35982 )
Norm@50keV : 0.712908 ( -0.737619 12.4099 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.17 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 56 degrees of freedom
# Null hypothesis probability = 1.658294e-01
Photon flux (15-150 keV) in 1 sec: 1.38690 ( -0.20356 0.20479 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.31056e-08 ( -1.15057e-08 1.25692e-08 ) ergs/cm2
Band function
Time interval is from 9.044 sec. to 10.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.996352 ( -1.54567 2.11963 )
beta : -9.37167 ( 9.37167 19.3666 )
Epeak [keV] : 37.0466 ( -4.72423 5.31156 )
Norm@50keV : 0.687865 ( -0.710288 12.0603 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.18 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 55 degrees of freedom
# Null hypothesis probability = 1.437532e-01
Photon flux (15-150 keV) in 1 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] : 9.55443 (-1.10946 1.2297)
R^2/D10^2 : 0.891055 (-0.340504 0.548174)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.29 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 57 degrees of freedom
# Null hypothesis probability = 1.870752e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.628e-08 3.540e-09
25- 50 3.790e-08 6.785e-09
50-150 1.731e-08 5.915e-09
15-150 7.150e-08 1.297e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 49.5511 (-13.4501 21.9247)
Norm : 8.57940 (-1.71467 2.19697)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.09 using 59 PHA bins.
# Reduced chi-squared = 1.282 for 57 degrees of freedom
# Null hypothesis probability = 7.414497e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.093e-08 3.850e-09
25- 50 2.997e-08 5.190e-09
50-150 2.885e-08 1.138e-08
15-150 7.975e-08 1.522e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.20963 (-3.21048 -3.21048)
R1^2/D10^2 : 10.5690 (-10.5648 -10.5648)
kT2 [keV] : 9.98433 (-1.42663 -9.98416)
R2^2/D10^2 : 0.716836 (-0.716866 0.64953)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.75 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 55 degrees of freedom
# Null hypothesis probability = 1.521360e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.752e-08 9.550e-09
25- 50 3.663e-08 2.053e-08
50-150 1.875e-08 1.143e-08
15-150 7.289e-08 3.945e-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: 1.94277 ( -0.132806 0.136329 )
Norm@50keV : 3.00077E-03 ( -0.000261146 0.000257783 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.72 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 57 degrees of freedom
# Null hypothesis probability = 3.432357e-01
Photon flux (15-150 keV) in 37.7 sec: 0.438676 ( -0.0324377 0.0324639 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04088e-06 ( -8.7424e-08 8.84695e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24283 ( -0.712132 0.594492 )
Epeak [keV] : 44.9236 ( -10.2382 27.2601 )
Norm@50keV : 7.60931E-03 ( -0.00410221 0.0121207 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.60 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 56 degrees of freedom
# Null hypothesis probability = 4.525473e-01
Photon flux (15-150 keV) in 37.7 sec: 0.425871 ( -0.034144 0.034136 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.64615e-07 ( -1.03867e-07 1.07928e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99005 ( -6.13749 -4.99005 )
beta : -2.15254 ( -0.227321 0.174815 )
Epeak [keV] : 24.7438 ( -3.38949 2.76888 )
Norm@50keV : 498.124 ( -36.0068 830.475 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.05 using 59 PHA bins.
# Reduced chi-squared = 0.9463 for 55 degrees of freedom
# Null hypothesis probability = 5.882388e-01
Photon flux (15-150 keV) in 37.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.82368e-07 ( -9.82104e-07 -9.60558e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.08e-07
S(50-100 keV) = 3.20e-07
T90 vs. Hardness ratio plot
T90 = 29.6879999637604 sec.
Hardness ratio (energy fluence ratio) = 1.03896
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.11744
Count Ratio (50-100 keV) / (15-25 keV) = 0.540798
Mask shadow pattern
IMX = 5.532775281390634E-01, IMY = -2.273382655302791E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-239.816000 -15.044000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9693 -15.6322 0.7 40.8 37.9 6.1554 15.7 0.8 Sco X-1
254.6096 35.3674 5.9 26.8 139.1 -0.4796 -2.0 7.6 Her X-1
255.8701 -37.8858 4.9 54.6 10.6 1.9943 2.3 6.1 4U 1700-377
256.4067 -36.3787 5.7 53.0 10.7 -1.2861 -2.0 3.0 GX 349+2
262.9767 -24.5905 85.8 40.1 8.3 0.0385 0.1 9.5 GX 1+4
268.3781 -1.4277 2.9 16.4 10.8 0.7008 4.0 1.6 SW J1753.5-0127
270.2842 -25.0792 3.6 39.4 -2.1 0.9395 3.2 0.0 GX 5-1
270.3025 -25.7431 171.9 40.1 -2.2 0.0195 0.1 0.0 GRS 1758-258
274.1493 -13.9909 6.8 28.3 -8.3 0.3481 1.7 8.8 GX 17+2
276.0460 -30.3427 3.6 44.7 -9.7 1.0010 3.2 6.4 H1820-303
284.9327 -25.0661 4.0 41.0 -22.6 0.8302 2.9 10.4 HT1900.1-2455
288.7855 10.9316 0.9 15.7 -85.6 2.5425 12.7 1.1 GRS 1915+105
299.5782 35.2047 1.0 31.7 -142.1 2.8274 11.6 0.6 Cyg X-1
308.0980 40.9649 2.1 40.5 -144.1 1.7967 5.5 0.9 Cyg X-3
262.8928 -33.8513 28.9 49.1 5.1 0.1572 0.4 4.9 GX 354-0
236.5008 -15.4829 2.9 46.8 45.9 2.8829 3.9 ------ UNKNOWN
256.4465 55.8281 2.8 43.5 160.4 1.6538 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-15.044000 22.652000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0084 -15.6814 11.5 40.8 37.8 -0.1783 -1.0 3.0 Sco X-1
254.6352 35.4993 0.0 26.9 139.3 -0.0587 -0.5 12.8 Her X-1
255.9492 -37.7281 24.3 54.4 10.6 0.1892 0.5 7.2 4U 1700-377
256.4711 -36.4561 10.3 53.1 10.6 0.3687 1.1 2.6 GX 349+2
262.9379 -24.6112 14.0 40.1 8.3 0.0997 0.8 8.9 GX 1+4
268.4980 -1.6168 0.0 16.5 10.2 0.0982 1.2 12.6 SW J1753.5-0127
270.4262 -24.9822 15.5 39.3 -2.3 -0.0861 -0.7 9.7 GX 5-1
270.2647 -25.5888 4.2 40.0 -2.1 -0.3132 -2.7 9.5 GRS 1758-258
274.0431 -13.9864 7.8 28.3 -8.1 0.1273 1.5 3.7 GX 17+2
276.0344 -30.4574 10.9 44.8 -9.7 -0.1410 -1.1 7.8 H1820-303
285.1272 -25.0463 3.9 41.0 -22.8 0.3594 2.9 9.0 HT1900.1-2455
288.8144 11.0639 8.4 15.7 -86.1 0.1182 1.4 7.2 GRS 1915+105
299.5112 35.1829 4.8 31.7 -142.1 0.2434 2.4 4.0 Cyg X-1
307.9600 41.0211 41.6 40.4 -144.3 0.0387 0.3 7.9 Cyg X-3
263.0393 -33.7703 17.6 49.0 5.0 0.1183 0.7 4.6 GX 354-0
231.4212 41.9588 1.9 45.3 129.9 2.1840 6.0 ------ UNKNOWN
258.5514 -13.0628 0.5 30.9 22.3 2.2048 21.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
327.084600 482.219300
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
64.1892 -12.8792 2.3 25.0 110.7 3.0518 5.1 ------ UNKNOWN
58.9263 23.3520 2.6 33.7 32.7 3.0313 4.4 ------ UNKNOWN
48.3766 6.0367 2.5 13.7 37.4 2.1459 4.7 ------ UNKNOWN
3.5471 39.6226 2.5 55.9 -33.1 12.2697 4.6 ------ UNKNOWN
Plot creation:
Sat May 30 20:04:19 EDT 2015