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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
273.7406 10.2796 0.0149 31.8565 18.6253 2.2916948 12.932 TRIG_00359378
Foreground time interval of the image:
-9.452 73.501 (delta_t = 82.953 [sec])
Background time interval of the image:
-239.000 -9.452 (delta_t = 229.548 [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
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)
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 -9.452 sec. to 151.488 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.22046 ( -0.140353 0.145502 )
Norm@50keV : 1.43908E-03 ( -0.00013652 0.00013494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.97 using 59 PHA bins.
# Reduced chi-squared = 1.350 for 57 degrees of freedom
# Null hypothesis probability = 4.017857e-02
Photon flux (15-150 keV) in 160.9 sec: 0.240837 ( -0.016699 0.0167137 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18351e-06 ( -1.75542e-07 1.78741e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.452 sec. to 151.488 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47772 ( -0.738567 0.539303 )
Epeak [keV] : 26.9622 ( -24.7658 8.77595 )
Norm@50keV : 4.02493E-03 ( -0.00215974 0.00732451 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.46 using 59 PHA bins.
# Reduced chi-squared = 1.294 for 56 degrees of freedom
# Null hypothesis probability = 6.857728e-02
Photon flux (15-150 keV) in 160.9 sec: 0.232023 ( -0.017984 0.018034 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99798e-06 ( -2.09331e-07 2.25517e-07 ) ergs/cm2
Band function
Time interval is from -9.452 sec. to 151.488 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47858 ( -0.34737 0.56754 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 26.9622 ( -8.37287 8.76824 )
Norm@50keV : 4.01772E-03 ( -0.00214482 0.00733416 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.46 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 55 degrees of freedom
# Null hypothesis probability = 5.732865e-02
Photon flux (15-150 keV) in 160.9 sec: 0.232700 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04839e-06 ( -2.04726e-06 -1.99419e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.44740 (-0.650409 0.71844)
R^2/D10^2 : 0.204990 (-0.0582087 0.0801298)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 100.10 using 59 PHA bins.
# Reduced chi-squared = 1.7561 for 57 degrees of freedom
# Null hypothesis probability = 3.676413e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.418e-07 5.028e-08
25- 50 8.481e-07 6.951e-08
50-150 2.655e-07 5.672e-08
15-150 1.555e-06 1.273e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 45.4855 (-7.96707 10.9508)
Norm : 1.41816 (-0.186691 0.222924)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.53 using 59 PHA bins.
# Reduced chi-squared = 1.272 for 57 degrees of freedom
# Null hypothesis probability = 8.059115e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.449e-07 5.310e-08
25- 50 7.555e-07 5.680e-08
50-150 6.689e-07 1.408e-07
15-150 1.969e-06 1.907e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.99182 (-1.00715 0.512856)
R1^2/D10^2 : 0.632514 (-0.26391 0.590748)
kT2 [keV] : 19.1124 (-4.89938 8.76996)
R2^2/D10^2 : 4.74096E-03 (-0.0036402 0.0121785)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.43 using 59 PHA bins.
# Reduced chi-squared = 1.262 for 55 degrees of freedom
# Null hypothesis probability = 9.122261e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.392e-07 1.413e-07
25- 50 7.457e-07 1.755e-07
50-150 7.533e-07 3.952e-07
15-150 2.038e-06 6.932e-07
Peak spectrum fit
Power-law model
Time interval is from 41.948 sec. to 42.948 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83044 ( -0.603265 0.662951 )
Norm@50keV : 5.15587E-03 ( -0.00193015 0.00176566 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.99 using 59 PHA bins.
# Reduced chi-squared = 0.8419 for 57 degrees of freedom
# Null hypothesis probability = 7.966765e-01
Photon flux (15-150 keV) in 1 sec: 0.719026 ( -0.208266 0.208725 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.74233e-08 ( -1.6494e-08 1.76907e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 41.948 sec. to 42.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82530 ( -1.11279 0.671078 )
Epeak [keV] : 9999.07 ( )
Norm@50keV : 5.17605E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.99 using 59 PHA bins.
# Reduced chi-squared = 0.8569 for 56 degrees of freedom
# Null hypothesis probability = 7.680894e-01
Photon flux (15-150 keV) in 1 sec: 0.718887 ( -0.20768 0.208392 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.71267e-08 ( -1.65149e-08 1.71575e-08 ) ergs/cm2
Band function
Time interval is from 41.948 sec. to 42.948 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.40921 ( 1.41063 1.41063 )
beta : -1.83005 ( 1.83118 0.603273 )
Epeak [keV] : 27.1786 ( -26.5577 -26.5577 )
Norm@50keV : 1.17186E-02 ( -0.0117996 1.41798e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.98 using 59 PHA bins.
# Reduced chi-squared = 0.8724 for 55 degrees of freedom
# Null hypothesis probability = 7.374232e-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] : 8.29201 (-2.41032 4.95013)
R^2/D10^2 : 0.652428 (-0.650215 1.95658)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.61 using 59 PHA bins.
# Reduced chi-squared = 0.9230 for 57 degrees of freedom
# Null hypothesis probability = 6.402856e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.320e-09 5.040e-09
25- 50 1.548e-08 9.765e-09
50-150 4.568e-09 3.440e-09
15-150 2.837e-08 1.765e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 100.084 (-101.097 -101.097)
Norm : 3.11283 (-1.0785 2.4613)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.83 using 59 PHA bins.
# Reduced chi-squared = 0.8567 for 57 degrees of freedom
# Null hypothesis probability = 7.708731e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.136e-09 4.957e-09
25- 50 1.407e-08 8.825e-09
50-150 2.281e-08 1.798e-08
15-150 4.502e-08 3.010e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.47300 (-2.37162 2.98149)
R1^2/D10^2 : 1.49511 (-1.15931 2.45266)
kT2 [keV] : 51.8196 (-33.605 -52.4694)
R2^2/D10^2 : 1.18979E-03 (-0.00111486 0.0201386)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.04 using 59 PHA bins.
# Reduced chi-squared = 0.8370 for 55 degrees of freedom
# Null hypothesis probability = 7.999414e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.549e-09 5.780e-09
25- 50 1.326e-08 7.610e-09
50-150 3.258e-08 1.926e-08
15-150 5.539e-08 2.760e-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: 2.13677 ( -0.172512 0.180755 )
Norm@50keV : 1.66622E-03 ( -0.000202966 0.000200213 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.99 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 57 degrees of freedom
# Null hypothesis probability = 1.512660e-01
Photon flux (15-150 keV) in 82.95 sec: 0.267000 ( -0.0242939 0.0243036 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2891e-06 ( -1.38604e-07 1.41882e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.783199 ( -1.16086 0.899353 )
Epeak [keV] : 33.8534 ( -10.4916 7.00497 )
Norm@50keV : 1.11318E-02 ( -0.0111373 0.0481588 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.58 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 56 degrees of freedom
# Null hypothesis probability = 3.141500e-01
Photon flux (15-150 keV) in 82.95 sec: 0.253111 ( -0.025391 0.025563 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11574e-06 ( -1.45892e-07 1.66555e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.34893 ( -2.74749 -1.36082 )
beta : -2.62204 ( 2.62041 0.380639 )
Epeak [keV] : 28.8297 ( -4.96207 9.3449 )
Norm@50keV : 0.395239 ( -0.428064 89.076 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.03 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 55 degrees of freedom
# Null hypothesis probability = 3.304054e-01
Photon flux (15-150 keV) in 82.95 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18883e-06 ( -1.18825e-06 -1.64822e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 6.95e-07
S(50-100 keV) = 5.96e-07
T90 vs. Hardness ratio plot
T90 = 146.351999938488 sec.
Hardness ratio (energy fluence ratio) = 0.857554
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.03862
Count Ratio (50-100 keV) / (15-25 keV) = 0.414584
Mask shadow pattern
IMX = 5.888474441801412E-01, IMY = -1.984581321168578E-01
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:
-239.000000 -9.452000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9788 -15.6320 0.2 24.1 -69.5 16.1379 48.2 0.5 Sco X-1
255.9616 -37.8415 0.9 20.3 -136.4 3.5255 12.6 1.2 4U 1700-377
256.2347 -36.2851 0.0 19.0 -133.9 0.0021 0.0 12.7 GX 349+2
263.0900 -24.5843 6.4 6.9 -108.6 0.4720 1.8 10.6 GX 1+4
264.9264 -44.5842 7.9 23.6 -160.6 0.4409 1.5 11.2 4U 1735-44
268.3818 -1.4441 2.1 19.9 7.3 1.4172 5.6 1.0 SW J1753.5-0127
270.3120 -25.0154 4.5 3.7 -178.2 0.6716 2.6 4.1 GX 5-1
270.3058 -25.6706 17.5 4.4 -176.7 0.1751 0.7 4.4 GRS 1758-258
274.0407 -14.1191 4.1 8.3 41.8 0.6895 2.8 5.4 GX 17+2
275.8482 -30.2713 4.2 10.5 160.3 0.6935 2.7 7.0 H1820-303
284.9964 -24.7785 9.7 14.5 117.7 -0.3665 -1.2 8.8 HT1900.1-2455
288.7024 10.9605 64.2 37.3 42.9 0.0992 0.2 5.7 GRS 1915+105
262.8087 -33.8274 5.0 13.9 -144.7 0.6088 2.3 9.0 GX 354-0
319.0591 -41.7480 3.2 46.0 139.1 4.0070 3.6 ------ UNKNOWN
267.8301 29.3873 2.5 50.7 8.9 3.8157 4.7 ------ UNKNOWN
255.0755 -41.6871 1.9 23.8 -141.2 1.6555 6.0 ------ UNKNOWN
219.3857 -69.8322 3.4 56.9 -150.6 5.1784 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-9.452000 73.500590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8263 -15.6864 4.6 24.2 -69.8 -0.4150 -2.5 9.3 Sco X-1
256.1661 -37.8046 4.0 20.2 -136.7 0.4186 2.9 8.8 4U 1700-377
256.6366 -36.5608 0.0 19.0 -135.2 0.1338 0.9 12.7 GX 349+2
263.0367 -24.8417 11.4 7.0 -110.3 -0.1341 -1.0 6.0 GX 1+4
264.5646 -44.5301 7.2 23.6 -159.9 -0.2258 -1.6 9.0 4U 1735-44
268.2694 -1.5664 113.9 19.8 6.9 -0.0133 -0.1 9.0 SW J1753.5-0127
270.3896 -24.9470 6.7 3.7 -179.5 -0.2308 -1.7 9.8 GX 5-1
270.4737 -25.7518 10.4 4.5 -178.5 0.1491 1.1 9.3 GRS 1758-258
274.1003 -14.1556 17.3 8.3 42.3 0.0865 0.7 9.0 GX 17+2
275.8677 -30.4921 8.2 10.7 160.9 -0.1794 -1.4 8.1 H1820-303
285.0118 -24.7740 4.0 14.5 117.7 0.3971 2.9 8.9 HT1900.1-2455
288.8991 10.9752 4.4 37.4 43.2 0.7062 2.6 6.2 GRS 1915+105
262.8051 -33.8079 3.9 13.9 -144.6 -0.3840 -3.0 9.3 GX 354-0
273.7406 10.2796 0.9 31.9 18.6 2.2968 13.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
141.700600 963.056700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9759 -15.6391 0.2 38.5 -162.6 50.5121 49.0 0.2 Sco X-1
254.5541 35.1728 0.0 30.4 -62.8 -2.0877 -1.6 11.2 Her X-1
255.9784 -37.8603 1.8 50.9 167.4 16.0810 6.3 1.0 4U 1700-377
256.4493 -36.2574 0.0 49.3 167.7 3.6671 1.7 10.0 GX 349+2
262.9751 -24.7683 3.3 36.6 165.9 4.0602 3.5 2.3 GX 1+4
268.4063 -1.5062 2.6 12.9 173.9 3.5822 4.5 4.0 SW J1753.5-0127
270.2828 -25.0647 103.7 35.5 154.7 0.1440 0.1 0.9 GX 5-1
270.3018 -25.7433 11.7 36.2 154.6 1.3872 1.0 0.0 GRS 1758-258
273.9966 -14.0301 29.1 24.3 148.7 0.3235 0.4 0.7 GX 17+2
276.0861 -30.3936 5.6 40.7 146.2 4.2770 2.1 8.5 H1820-303
285.0325 -24.9117 291.5 36.9 132.1 0.0624 0.0 0.6 HT1900.1-2455
288.8275 11.0099 2.0 14.8 55.1 4.1300 5.9 4.2 GRS 1915+105
299.6042 35.1915 0.4 34.3 8.6 30.8167 32.4 0.9 Cyg X-1
308.0660 40.9818 2.7 43.1 7.8 5.3790 4.3 2.7 Cyg X-3
263.0626 -33.9342 8.2 45.4 161.8 2.8038 1.4 7.0 GX 354-0
314.1584 24.9741 2.4 41.0 32.8 6.9121 4.9 ------ UNKNOWN
298.3734 35.3348 2.7 33.6 7.2 3.7380 4.3 ------ UNKNOWN
263.4135 18.9568 2.4 13.2 -78.6 3.5766 4.8 ------ UNKNOWN
227.1498 -4.1733 4.2 48.6 -135.7 9.9836 2.8 ------ UNKNOWN
Plot creation:
Sun May 31 03:16:02 EDT 2015