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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
40.3815 -39.6916 0.0243 47.7545 18.6216 2.2270323 7.904 TRIG_00612804
Foreground time interval of the image:
-0.904 73.501 (delta_t = 74.405 [sec])
Background time interval of the image:
-210.699 -0.904 (delta_t = 209.795 [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 64.000000
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 64.000000
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 64.000000
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 -0.904 sec. to 79.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14470 ( -0.27554 0.305293 )
Norm@50keV : 2.00221E-03 ( -0.000401574 0.000387371 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.62 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 57 degrees of freedom
# Null hypothesis probability = 3.468272e-01
Photon flux (15-150 keV) in 79.97 sec: 0.322131 ( -0.0495387 0.0495938 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49477e-06 ( -2.6197e-07 2.6795e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.904 sec. to 79.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12917 ( -1.77247 0.934202 )
Epeak [keV] : 36.9544 ( -31.2032 25.8092 )
Norm@50keV : 7.47812E-03 ( -0.00747813 0.0730993 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.58 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 56 degrees of freedom
# Null hypothesis probability = 3.809019e-01
Photon flux (15-150 keV) in 79.97 sec: 0.310715 ( -0.051678 0.051403 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39842e-06 ( -2.75465e-07 2.90363e-07 ) ergs/cm2
Band function
Time interval is from -0.904 sec. to 79.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12895 ( -6.33532 1.77155 )
beta : -9.36992 ( 9.37132 19.3713 )
Epeak [keV] : 36.9434 ( -25.7432 25.2536 )
Norm@50keV : 7.48048E-03 ( -0.00439803 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.58 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 55 degrees of freedom
# Null hypothesis probability = 3.454456e-01
Photon flux (15-150 keV) in 79.97 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40816e-06 ( -1.4076e-06 -2.92842e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.77782 (-1.50981 1.80397)
R^2/D10^2 : 0.163424 (-0.0793324 0.150863)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.61 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 57 degrees of freedom
# Null hypothesis probability = 2.549996e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.524e-07 7.529e-08
25- 50 6.078e-07 1.495e-07
50-150 2.971e-07 1.200e-07
15-150 1.157e-06 2.495e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 55.9256 (-18.5791 33.2697)
Norm : 1.74575 (-0.408234 0.534447)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.66 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.144981e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.466e-07 7.349e-08
25- 50 5.159e-07 1.000e-07
50-150 5.528e-07 2.146e-07
15-150 1.415e-06 3.203e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.62769 (-1.0306 2.04294)
R1^2/D10^2 : 1039.54 (-2155.66 -2160.95)
kT2 [keV] : 10.8609 (-1.8017 2.39113)
R2^2/D10^2 : 0.102383 (-0.0367201 0.072034)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.92 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 55 degrees of freedom
# Null hypothesis probability = 4.035472e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.065e-07 1.188e-07
25- 50 5.607e-07 1.954e-07
50-150 3.693e-07 1.646e-07
15-150 1.237e-06 3.756e-07
Peak spectrum fit
Power-law model
Time interval is from 1.804 sec. to 2.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81076 ( -0.489968 0.540039 )
Norm@50keV : 9.80008E-03 ( -0.00331742 0.00319736 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.12 using 59 PHA bins.
# Reduced chi-squared = 0.8442 for 57 degrees of freedom
# Null hypothesis probability = 7.926684e-01
Photon flux (15-150 keV) in 1 sec: 1.35610 ( -0.420316 0.42186 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.01889e-08 ( -2.98985e-08 3.0562e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.804 sec. to 2.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.362159 ( -4.44852 1.81437 )
Epeak [keV] : 52.8971 ( )
Norm@50keV : 5.80993E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.11 using 59 PHA bins.
# Reduced chi-squared = 0.8412 for 56 degrees of freedom
# Null hypothesis probability = 7.954599e-01
Photon flux (15-150 keV) in 1 sec: 1.30407 ( -0.438041 0.43358 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.399e-08 ( -3.01807e-08 3.2293e-08 ) ergs/cm2
Band function
Time interval is from 1.804 sec. to 2.804 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.403782 ( 0.403782 0.403782 )
beta : -8.46041 ( 6.68059 16.6806 )
Epeak [keV] : 52.9967 ( -52.9653 185.849 )
Norm@50keV : 5.53982E-02 ( -0.0552714 1262.66 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.11 using 59 PHA bins.
# Reduced chi-squared = 0.8565 for 55 degrees of freedom
# Null hypothesis probability = 7.665239e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.48816e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.6982 (-3.36311 4.44736)
R^2/D10^2 : 0.285496 (-0.285499 0.594026)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.86 using 59 PHA bins.
# Reduced chi-squared = 0.8396 for 57 degrees of freedom
# Null hypothesis probability = 8.004818e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.763e-09 6.094e-09
25- 50 3.277e-08 1.901e-08
50-150 3.295e-08 2.211e-08
15-150 7.548e-08 4.612e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 96.1609 (-54.9885 -96.1631)
Norm : 6.16681 (-2.19239 3.30991)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.46 using 59 PHA bins.
# Reduced chi-squared = 0.8327 for 57 degrees of freedom
# Null hypothesis probability = 8.119888e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.611e-08 1.032e-08
25- 50 2.764e-08 1.766e-08
50-150 4.380e-08 3.491e-08
15-150 8.755e-08 6.105e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.52339 (-3.52357 65.2229)
R1^2/D10^2 : 15.6989 (-15.6992 -15.6992)
kT2 [keV] : 14.2833 (-4.30291 -14.283)
R2^2/D10^2 : 0.167406 (-0.167419 0.512989)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.82 using 59 PHA bins.
# Reduced chi-squared = 0.8512 for 55 degrees of freedom
# Null hypothesis probability = 7.758406e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.466e-08 8.125e-09
25- 50 2.915e-08 1.777e-08
50-150 3.707e-08 2.554e-08
15-150 8.088e-08 4.789e-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: 2.13042 ( -0.276447 0.305715 )
Norm@50keV : 2.08746E-03 ( -0.000417596 0.000402421 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.69 using 59 PHA bins.
# Reduced chi-squared = 0.9594 for 57 degrees of freedom
# Null hypothesis probability = 5.623768e-01
Photon flux (15-150 keV) in 74.4 sec: 0.333429 ( -0.0513376 0.051392 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44748e-06 ( -2.54319e-07 2.60045e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28763 ( -1.64922 0.92654 )
Epeak [keV] : 36.5301 ( )
Norm@50keV : 6.23284E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.19 using 59 PHA bins.
# Reduced chi-squared = 0.9498 for 56 degrees of freedom
# Null hypothesis probability = 5.818574e-01
Photon flux (15-150 keV) in 74.4 sec: 0.323655 ( -0.053365 0.053107 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3668e-06 ( -2.70087e-07 2.82541e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28688 ( -6.21343 1.20801 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 36.5447 ( -25.9323 -36.5448 )
Norm@50keV : 6.23609E-03 ( -0.00623606 0.050033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.19 using 59 PHA bins.
# Reduced chi-squared = 0.9671 for 55 degrees of freedom
# Null hypothesis probability = 5.440257e-01
Photon flux (15-150 keV) in 74.4 sec: 0.330938 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36631e-06 ( -1.36579e-06 -2.7057e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 4.68e-07
S(50-100 keV) = 4.23e-07
T90 vs. Hardness ratio plot
T90 = 68.9760000109673 sec.
Hardness ratio (energy fluence ratio) = 0.903846
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.4086
Count Ratio (50-100 keV) / (15-25 keV) = 0.60948
Mask shadow pattern
IMX = 1.043444517497601E+00, IMY = -3.515964587179286E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
-210.699400 -0.904000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6289 22.0221 0.3 27.7 -137.9 9.0859 43.7 0.5 Crab
39.9199 29.6546 2.6 33.7 138.9 1.3430 4.5 ------ UNKNOWN
49.7475 12.2427 2.2 15.2 121.2 0.9757 5.3 ------ UNKNOWN
63.4884 50.8636 2.5 47.3 176.6 1.7531 4.6 ------ UNKNOWN
63.0470 -28.0591 2.9 31.6 -5.4 0.8927 4.0 ------ UNKNOWN
73.8794 -49.7625 2.7 54.2 -13.4 2.4923 4.3 ------ UNKNOWN
87.8873 -50.8579 2.5 58.6 -22.9 5.3814 4.7 ------ UNKNOWN
92.6944 -23.9930 2.6 40.4 -49.7 1.6628 4.4 ------ UNKNOWN
105.2633 22.1145 3.2 45.5 -122.2 2.8392 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.904000 73.500600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.5769 22.1722 20.6 27.7 -138.3 -0.0683 -0.6 10.0 Crab
40.3815 -39.6916 1.5 47.8 18.6 2.2247 7.9 ------ UNKNOWN
43.8640 -32.8100 1.8 40.4 20.0 1.1016 6.5 ------ UNKNOWN
74.0548 -11.0610 1.7 18.7 -42.6 0.6514 6.8 ------ UNKNOWN
101.5087 -8.4953 2.5 40.8 -76.9 1.7049 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
139.900600 963.060000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
28.1916 -8.7609 3.0 32.8 128.2 3.0741 3.8 ------ UNKNOWN
60.0980 14.0589 2.9 56.8 173.9 11.7086 3.9 ------ UNKNOWN
14.9431 -54.6662 3.2 22.6 11.1 1.6557 3.6 ------ UNKNOWN
25.2568 -59.1229 3.7 21.6 -7.8 1.5875 3.1 ------ UNKNOWN
88.4861 -8.0817 3.6 53.2 -142.2 9.5832 3.2 ------ UNKNOWN
91.2617 -19.2635 3.9 48.0 -129.0 7.5120 3.0 ------ UNKNOWN
93.8916 -34.1141 3.0 42.5 -109.2 9.3749 3.9 ------ UNKNOWN
Plot creation:
Thu May 28 14:24:23 EDT 2015