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
241.2976 21.9061 0.0069 46.1669 -30.7733 3.2816359 27.952 TRIG_00440285
Foreground time interval of the image:
-2.960 14.365 (delta_t = 17.325 [sec])
Background time interval of the image:
-239.536 -2.960 (delta_t = 236.576 [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)
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 -2.960 sec. to 197.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42561 ( -0.0861292 0.0860033 )
Norm@50keV : 2.59488E-03 ( -0.000117211 0.000117211 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.13 using 59 PHA bins.
# Reduced chi-squared = 0.8970 for 57 degrees of freedom
# Null hypothesis probability = 6.939395e-01
Photon flux (15-150 keV) in 200 sec: 0.317894 ( -0.0157079 0.0157632 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.98916e-06 ( -2.40006e-07 2.41052e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.960 sec. to 197.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42701 ( -0.0924066 0.0835524 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.59161E-03 ( -0.000117626 0.000490747 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.20 using 59 PHA bins.
# Reduced chi-squared = 0.9143 for 56 degrees of freedom
# Null hypothesis probability = 6.566751e-01
Photon flux (15-150 keV) in 200 sec: 0.318472 ( -0.016463 0.015109 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.98638e-06 ( -2.36e-07 2.3778e-07 ) ergs/cm2
Band function
Time interval is from -2.960 sec. to 197.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.98175 ( 0.822498 1.98175 )
beta : -1.42527 ( -0.0862805 0.0859677 )
Epeak [keV] : 9999.36 ( -9998.59 -9998.59 )
Norm@50keV : 2.59284E-03 ( 0.822496 -0.00259491 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.13 using 59 PHA bins.
# Reduced chi-squared = 0.9296 for 55 degrees of freedom
# Null hypothesis probability = 6.232964e-01
Photon flux (15-150 keV) in 200 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] : 18.3844 ( )
R^2/D10^2 : 1.74697E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 192.81 using 59 PHA bins.
# Reduced chi-squared = 3.3827 for 57 degrees of freedom
# Null hypothesis probability = 1.199558e-16
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.348e-07 2.430e-08
25- 50 1.103e-06 7.610e-08
50-150 2.720e-06 2.100e-07
15-150 4.058e-06 2.360e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.31940 (-0.0599713 0.0599581)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.80 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 57 degrees of freedom
# Null hypothesis probability = 1.757915e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.571e-07 3.370e-08
25- 50 1.264e-06 7.140e-08
50-150 2.772e-06 1.560e-07
15-150 4.693e-06 2.560e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.25544 (-0.969351 1.12784)
R1^2/D10^2 : 0.501601 (-0.23161 0.485479)
kT2 [keV] : 28.9588 (-3.45434 4.87261)
R2^2/D10^2 : 3.27502E-03 (-0.00131973 0.0017935)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.37 using 59 PHA bins.
# Reduced chi-squared = 0.9703 for 55 degrees of freedom
# Null hypothesis probability = 5.371874e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.403e-07 1.013e-07
25- 50 1.136e-06 1.405e-07
50-150 3.268e-06 3.600e-07
15-150 5.044e-06 5.840e-07
Peak spectrum fit
Power-law model
Time interval is from -0.300 sec. to 0.700 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17426 ( -0.249532 0.241877 )
Norm@50keV : 1.93871E-02 ( -0.00298383 0.00297525 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.90 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.418486e-01
Photon flux (15-150 keV) in 1 sec: 2.26781 ( -0.364596 0.367303 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98141e-07 ( -3.14515e-08 3.16121e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.300 sec. to 0.700 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.378059 ( -1.75292 1.22555 )
Epeak [keV] : 84.5723 ( -20.523 106.243 )
Norm@50keV : 9.95294E-02 ( -0.0995323 0.500902 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.91 using 59 PHA bins.
# Reduced chi-squared = 0.9448 for 56 degrees of freedom
# Null hypothesis probability = 5.926838e-01
Photon flux (15-150 keV) in 1 sec: 2.13824 ( -0.37709 0.38049 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.84382e-07 ( -3.515e-08 3.4743e-08 ) ergs/cm2
Band function
Time interval is from -0.300 sec. to 0.700 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.48983 ( -1.8676 -1.28096 )
beta : -1.81137 ( 1.98073 0.718245 )
Epeak [keV] : 54.8733 ( -24.0487 68.321 )
Norm@50keV : 1.54920 ( -1.54768 23.2724 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.73 using 59 PHA bins.
# Reduced chi-squared = 0.9405 for 55 degrees of freedom
# Null hypothesis probability = 6.003973e-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] : 18.6496 (-2.88291 3.68642)
R^2/D10^2 : 0.139277 (-0.0639752 0.107709)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.31 using 59 PHA bins.
# Reduced chi-squared = 0.9528 for 57 degrees of freedom
# Null hypothesis probability = 5.767103e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.585e-09 2.770e-09
25- 50 4.549e-08 1.037e-08
50-150 1.158e-07 3.093e-08
15-150 1.709e-07 3.470e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 9.66265 (-1.50157 1.50123)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.98 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.730593e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.408e-08 1.374e-08
25- 50 4.631e-08 2.613e-08
50-150 1.016e-07 5.750e-08
15-150 1.720e-07 9.725e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 14.7852 (-14.8311 4.93067)
R1^2/D10^2 : 0.244638 (-0.13677 -0.242271)
kT2 [keV] : 64.9746 (-71.3943 -71.3943)
R2^2/D10^2 : 1.40938E-03 (-0.00106207 0.15857)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.76 using 59 PHA bins.
# Reduced chi-squared = 0.9410 for 55 degrees of freedom
# Null hypothesis probability = 5.993455e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.175e-08 7.250e-09
25- 50 4.800e-08 2.857e-08
50-150 1.261e-07 6.815e-08
15-150 1.859e-07 1.031e-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: 1.42283 ( -0.102792 0.102734 )
Norm@50keV : 1.25922E-02 ( -0.000702411 0.000702388 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.98 using 59 PHA bins.
# Reduced chi-squared = 0.9296 for 57 degrees of freedom
# Null hypothesis probability = 6.264220e-01
Photon flux (15-150 keV) in 17.32 sec: 1.54164 ( -0.0929883 0.0934416 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09782e-06 ( -1.24889e-07 1.25317e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42381 ( -0.186968 0.100691 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.26180E-02 ( -0.000697863 0.00472615 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.00 using 59 PHA bins.
# Reduced chi-squared = 0.9465 for 56 degrees of freedom
# Null hypothesis probability = 5.890851e-01
Photon flux (15-150 keV) in 17.32 sec: 1.54273 ( -0.09567 0.09161 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09789e-06 ( -1.22435e-07 1.24306e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18780 ( 1.1878 1.1878 )
beta : -1.42283 ( -0.102737 0.102794 )
Epeak [keV] : 24.1929 ( -24.1929 -24.1929 )
Norm@50keV : 2.52839E-02 ( -0.00971873 1.78164 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.98 using 59 PHA bins.
# Reduced chi-squared = 0.9634 for 55 degrees of freedom
# Null hypothesis probability = 5.519984e-01
Photon flux (15-150 keV) in 17.32 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) = 1.19e-06
S(50-100 keV) = 1.77e-06
T90 vs. Hardness ratio plot
T90 = 131.120000064373 sec.
Hardness ratio (energy fluence ratio) = 1.48739
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.23862
Count Ratio (50-100 keV) / (15-25 keV) = 1.12157
Mask shadow pattern
IMX = 8.949294185747902E-01, IMY = 5.329194475287095E-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:
-239.536000 -2.960000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3175 35.2757 9.7 37.7 -7.6 0.3328 1.2 7.9 Her X-1
268.3534 -1.3978 3.0 26.2 -82.9 1.1428 3.8 3.4 SW J1753.5-0127
274.1010 -14.0536 8.2 32.3 -108.7 0.4441 1.4 5.6 GX 17+2
285.0155 -24.8920 5.6 39.6 -131.1 0.7740 2.1 2.0 HT1900.1-2455
288.8000 10.9410 1.1 3.6 -127.1 1.9509 10.2 0.3 GRS 1915+105
299.4625 35.1904 2.7 22.6 64.3 1.0996 4.3 6.3 Cyg X-1
308.1202 40.9471 3.3 31.1 70.5 1.3480 3.4 0.6 Cyg X-3
335.8272 0.7519 3.3 47.8 145.0 2.9922 3.5 ------ UNKNOWN
323.1938 -23.8253 2.5 50.5 -178.6 2.4002 4.7 ------ UNKNOWN
250.3046 39.5567 3.0 42.4 -3.6 1.1931 3.8 ------ UNKNOWN
293.1751 -9.3813 2.6 24.1 -146.4 0.9217 4.4 ------ UNKNOWN
272.3943 1.5450 3.0 21.2 -83.4 0.8925 3.8 ------ UNKNOWN
263.7553 -18.0129 3.9 41.2 -98.6 2.9455 3.0 ------ UNKNOWN
256.7516 -10.7068 3.0 41.1 -83.5 3.6090 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.960000 14.364600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4664 35.4814 10.6 37.7 -7.2 0.0881 1.1 8.3 Her X-1
268.3410 -1.5237 7.1 26.3 -83.1 0.1206 1.6 4.6 SW J1753.5-0127
274.2194 -14.0332 0.0 32.3 -108.9 -0.1136 -1.3 12.4 GX 17+2
285.0357 -24.9176 249.7 39.6 -131.1 0.0048 0.0 0.2 HT1900.1-2455
288.6615 10.9860 4.6 3.6 -124.8 -0.1287 -2.5 8.4 GRS 1915+105
299.7873 35.2399 6.1 22.7 64.9 0.1316 1.9 9.9 Cyg X-1
308.2372 40.9000 5.6 31.1 70.7 -0.1913 -2.1 6.6 Cyg X-3
299.4663 23.2029 2.6 12.9 88.4 0.2606 4.4 ------ UNKNOWN
247.2288 24.2504 1.8 40.9 -26.9 0.5441 6.3 ------ UNKNOWN
248.4816 22.5823 2.5 39.6 -29.3 0.3844 4.6 ------ UNKNOWN
241.2976 21.9061 0.4 46.2 -30.8 3.2818 28.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
94.164600 651.964600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9785 -15.6371 0.6 37.7 -71.9 16.9568 18.6 0.2 Sco X-1
254.5756 35.5212 0.0 17.9 151.5 -0.6049 -1.5 12.2 Her X-1
268.3083 -1.4648 2.9 35.2 -118.0 2.8127 4.0 3.7 SW J1753.5-0127
288.7915 10.9283 1.9 46.7 -150.4 4.9617 5.9 1.1 GRS 1915+105
299.4856 35.1212 5.2 52.1 175.7 2.8807 2.2 7.0 Cyg X-1
230.8471 56.4003 3.7 35.4 104.0 2.9843 3.1 ------ UNKNOWN
304.9910 32.0950 4.0 56.9 179.0 7.9233 2.9 ------ UNKNOWN
211.1365 2.9426 3.3 34.8 -4.7 1.7520 3.4 ------ UNKNOWN
241.5542 7.7427 2.5 14.1 -67.2 1.7026 4.6 ------ UNKNOWN
210.3307 -14.7713 2.8 47.6 -23.7 3.0768 4.2 ------ UNKNOWN
258.8019 -15.1756 3.2 40.8 -92.4 6.3885 3.6 ------ UNKNOWN
Plot creation:
Sat May 30 23:24:19 EDT 2015