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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
328.0207 -38.8517 0.0154 25.3780 -58.7521 0.1124605 12.464 TRIG_00277582
Foreground time interval of the image:
-0.208 0.328 (delta_t = 0.536 [sec])
Background time interval of the image:
-165.267 -0.208 (delta_t = 165.059 [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 0.384000
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 0.384000
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 0.384000
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 -0.208 sec. to 0.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64518 ( -0.220136 0.227075 )
Norm@50keV : 1.30708E-02 ( -0.00190965 0.00187761 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.18 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 57 degrees of freedom
# Null hypothesis probability = 2.135354e-01
Photon flux (15-150 keV) in 0.536 sec: 1.70402 ( -0.226196 0.226268 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.51867e-08 ( -1.00305e-08 1.02027e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.208 sec. to 0.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09655 ( -1.24382 0.722239 )
Epeak [keV] : 72.6969 ( -23.6655 -72.7552 )
Norm@50keV : 2.66321E-02 ( -0.0150491 0.110485 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.24 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 56 degrees of freedom
# Null hypothesis probability = 2.101636e-01
Photon flux (15-150 keV) in 0.536 sec: 1.67832 ( -0.23202 0.23101 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.17783e-08 ( -1.18519e-08 1.18054e-08 ) ergs/cm2
Band function
Time interval is from -0.208 sec. to 0.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.255771 ( -2.97737 -0.282016 )
beta : -2.00384 ( 2.00708 0.433586 )
Epeak [keV] : 40.9500 ( -19.1553 76.4173 )
Norm@50keV : 0.210464 ( -0.243753 494.714 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.10 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 55 degrees of freedom
# Null hypothesis probability = 2.379284e-01
Photon flux (15-150 keV) in 0.536 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.20157e-08 ( -6.2012e-08 -1.05502e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.5309 (-1.65178 2.02258)
R^2/D10^2 : 0.496582 (-0.22287 0.378216)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.88 using 59 PHA bins.
# Reduced chi-squared = 1.279 for 57 degrees of freedom
# Null hypothesis probability = 7.644059e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.453e-09 1.808e-09
25- 50 2.236e-08 4.079e-09
50-150 1.739e-08 5.837e-09
15-150 4.720e-08 8.533e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 143.784 (-62.77 -141.861)
Norm : 7.10785 (-1.03293 1.36555)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.28 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.369168e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.818e-09 5.443e-09
25- 50 1.809e-08 9.684e-09
50-150 3.507e-08 2.116e-08
15-150 6.297e-08 3.241e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.09957 (-2.49976 2.3682)
R1^2/D10^2 : 1.00972 ( )
kT2 [keV] : 59.4687 (-39.1855 -59.9657)
R2^2/D10^2 : 1.43390E-03 (-0.00129331 0.0371288)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.39 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.04 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 55 degrees of freedom
# Reduced chi-squared = 1.110 for 55 degrees of freedom
# Null hypothesis probability = 2.577680e-01
# Null hypothesis probability = 2.678359e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.223e-09 5.245e-09
25- 50 2.026e-08 9.275e-09
50-150 3.267e-08 1.948e-08
15-150 6.215e-08 2.748e-08
Peak spectrum fit
Power-law model
Time interval is from -0.438 sec. to 0.562 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83598 ( -0.235974 0.248678 )
Norm@50keV : 7.90359E-03 ( -0.00134905 0.00131953 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.60 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 57 degrees of freedom
# Null hypothesis probability = 2.283204e-01
Photon flux (15-150 keV) in 1 sec: 1.10466 ( -0.15627 0.156279 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.26902e-08 ( -1.2269e-08 1.25955e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.438 sec. to 0.562 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.370660 ( -1.91548 1.30856 )
Epeak [keV] : 43.5862 ( -8.99209 43.055 )
Norm@50keV : 6.03172E-02 ( -0.0604056 0.873753 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.86 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 56 degrees of freedom
# Null hypothesis probability = 3.051910e-01
Photon flux (15-150 keV) in 1 sec: 1.06235 ( -0.159254 0.16041 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.23003e-08 ( -1.26643e-08 1.51505e-08 ) ergs/cm2
Band function
Time interval is from -0.438 sec. to 0.562 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.766007 ( -2.00092 -0.792484 )
beta : -2.46633 ( 2.46804 0.58615 )
Epeak [keV] : 35.8693 ( -12.1172 18.7144 )
Norm@50keV : 0.379662 ( -0.442388 285.221 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.01 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 55 degrees of freedom
# Null hypothesis probability = 3.312718e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.67837e-08 ( -6.67767e-08 -1.27896e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.0498 (-1.37596 1.63008)
R^2/D10^2 : 0.538984 (-0.235886 0.401496)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.82 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 57 degrees of freedom
# Null hypothesis probability = 2.492266e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.110e-08 2.587e-09
25- 50 2.780e-08 5.950e-09
50-150 1.472e-08 5.748e-09
15-150 5.363e-08 1.033e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 79.7616 (-28.756 62.8444)
Norm : 5.27477 (-0.966525 1.27128)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.04 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 57 degrees of freedom
# Null hypothesis probability = 3.013758e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.368e-08 2.485e-09
25- 50 2.251e-08 4.005e-09
50-150 3.171e-08 1.689e-08
15-150 6.791e-08 2.300e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.71892 (-3.31648 1.88736)
R1^2/D10^2 : 0.828564 (-0.454269 1.86848)
kT2 [keV] : 52.4426 (-55.9315 -55.9316)
R2^2/D10^2 : 8.46895E-04 (-0.000625268 0.158582)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.59 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 55 degrees of freedom
# Null hypothesis probability = 3.450209e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.230e-08 4.993e-09
25- 50 2.615e-08 9.927e-09
50-150 3.131e-08 1.666e-08
15-150 6.975e-08 2.541e-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: 1.64518 ( -0.220136 0.227075 )
Norm@50keV : 1.30708E-02 ( -0.00190965 0.00187761 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.18 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 57 degrees of freedom
# Null hypothesis probability = 2.135354e-01
Photon flux (15-150 keV) in 0.536 sec: 1.70402 ( -0.226196 0.226268 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.51867e-08 ( -1.00305e-08 1.02027e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09655 ( -1.24382 0.722239 )
Epeak [keV] : 72.6969 ( -26.5711 -72.7552 )
Norm@50keV : 2.66321E-02 ( -0.0150491 0.110485 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.24 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 56 degrees of freedom
# Null hypothesis probability = 2.101636e-01
Photon flux (15-150 keV) in 0.536 sec: 1.67832 ( -0.23202 0.23101 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.17783e-08 ( -1.18519e-08 1.18054e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.255771 ( -2.96759 -0.282016 )
beta : -2.00384 ( 2.00708 0.433586 )
Epeak [keV] : 40.9500 ( -19.1553 76.0419 )
Norm@50keV : 0.210464 ( -0.243753 494.751 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.10 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 55 degrees of freedom
# Null hypothesis probability = 2.379284e-01
Photon flux (15-150 keV) in 0.536 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.20157e-08 ( -6.2012e-08 -1.05502e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.72e-08
S(50-100 keV) = 2.20e-08
T90 vs. Hardness ratio plot
T90 = 0.488000005483627 sec.
Hardness ratio (energy fluence ratio) = 1.27907
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.2541
Count Ratio (50-100 keV) / (15-25 keV) = 0.822309
Mask shadow pattern
IMX = 2.460721638085664E-01, IMY = 4.055484913668132E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.384000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.384000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.384000
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:
-165.267410 -0.208000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.0689 -37.9349 26.4 34.1 76.8 0.1231 0.4 6.7 4U 1700-377
256.5123 -36.5752 9.1 33.9 79.3 -0.3721 -1.3 9.9 GX 349+2
262.9840 -24.8244 6.9 31.2 103.0 0.4306 1.7 4.9 GX 1+4
264.8647 -44.3334 10.2 28.1 63.3 0.2180 1.1 8.7 4U 1735-44
268.4520 -1.3481 42.3 41.5 140.5 -0.1072 -0.3 8.0 SW J1753.5-0127
270.2889 -25.0590 2.3 25.0 108.0 0.8914 4.9 1.2 GX 5-1
270.4493 -25.8900 0.0 24.6 106.3 0.2653 1.5 11.9 GRS 1758-258
273.9518 -14.0761 13.9 28.3 132.8 0.1556 0.8 3.9 GX 17+2
275.9067 -30.3910 3.3 18.6 98.4 0.5155 3.5 1.7 H1820-303
285.2024 -25.0392 3.8 13.2 128.9 -0.3666 -3.0 11.5 HT1900.1-2455
288.8156 10.9389 1.1 44.2 175.5 2.5021 10.0 1.1 GRS 1915+105
262.9668 -33.7142 3.9 29.0 85.8 0.6536 3.0 7.3 GX 354-0
356.6698 -41.5522 4.3 47.1 -53.2 2.2084 2.7 ------ UNKNOWN
331.0474 0.1642 3.1 45.3 -121.3 2.8143 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.208000 0.328000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.8322 -37.7221 7.3 34.4 77.2 0.0228 1.6 10.4 4U 1700-377
256.5819 -36.5655 8.9 33.8 79.3 0.0182 1.3 11.1 GX 349+2
263.1805 -24.7243 11.9 31.1 103.3 0.0114 1.0 9.4 GX 1+4
264.7550 -44.3921 686.3 28.2 63.3 0.0002 0.0 3.5 4U 1735-44
268.2335 -1.4745 7.3 41.5 140.2 -0.0292 -1.6 8.2 SW J1753.5-0127
270.1013 -25.2058 0.0 25.1 107.5 -0.0129 -1.4 12.5 GX 5-1
270.4860 -25.6166 0.0 24.6 107.0 -0.0097 -1.1 12.5 GRS 1758-258
274.0813 -13.9940 13.3 28.3 133.1 -0.0084 -0.9 5.1 GX 17+2
276.0909 -30.4638 2700.0 18.5 98.3 0.0000 0.0 10.4 H1820-303
285.0681 -25.0117 7.2 13.3 128.7 0.0120 1.6 5.7 HT1900.1-2455
288.9120 10.9038 5.5 44.1 175.6 0.0277 2.1 7.1 GRS 1915+105
263.0197 -33.9745 4.2 28.9 85.3 0.0290 2.8 8.5 GX 354-0
272.2113 -0.9007 2.4 39.6 145.6 0.0685 4.8 ------ UNKNOWN
292.7366 11.9320 2.3 44.6 -178.9 0.0667 5.1 ------ UNKNOWN
328.0207 -38.8517 0.9 25.4 -58.8 0.1125 12.5 ------ UNKNOWN
308.1343 24.8955 1.9 58.2 -160.8 0.2572 6.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
228.332590 962.654100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
285.0202 -25.0517 11.4 38.6 123.0 -0.8540 -1.0 7.9 HT1900.1-2455
284.4977 -29.7187 2.7 36.7 115.9 3.2554 4.2 ------ UNKNOWN
293.9803 -71.5944 2.5 37.0 42.1 2.5632 4.6 ------ UNKNOWN
308.4216 -65.0131 2.6 28.5 42.3 1.6906 4.5 ------ UNKNOWN
58.4027 -70.7947 2.8 53.8 1.0 4.2481 4.1 ------ UNKNOWN
8.9490 -18.1822 3.6 41.0 -83.4 5.9665 3.2 ------ UNKNOWN
Plot creation:
Sun May 31 10:23:14 EDT 2015