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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
105.2879 -7.8488 0.0182 41.5279 176.7982 1.3076689 10.554 TRIG_00301981
Foreground time interval of the image:
-3.456 52.432 (delta_t = 55.888 [sec])
Background time interval of the image:
-355.699 -264.950 (delta_t = 90.749 [sec])
-239.000 -3.456 (delta_t = 235.544 [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 -3.456 sec. to 52.432 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26839 ( -0.266422 0.256252 )
Norm@50keV : 1.50713E-03 ( -0.000221911 0.000221558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.57 using 59 PHA bins.
# Reduced chi-squared = 0.9223 for 57 degrees of freedom
# Null hypothesis probability = 6.418104e-01
Photon flux (15-150 keV) in 55.89 sec: 0.178799 ( -0.0280672 0.028225 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.38982e-07 ( -1.30077e-07 1.30968e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.456 sec. to 52.432 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26882 ( -0.271355 0.255092 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.51277E-03 ( -0.000221751 0.0028215 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.57 using 59 PHA bins.
# Reduced chi-squared = 0.9388 for 56 degrees of freedom
# Null hypothesis probability = 6.053569e-01
Photon flux (15-150 keV) in 55.89 sec: 0.178956 ( -0.02833 0.027866 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.38842e-07 ( -6.6878e-08 1.30196e-07 ) ergs/cm2
Band function
Time interval is from -3.456 sec. to 52.432 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.18489E-02 ( 0.297423 0.297423 )
beta : -1.38065 ( 1.36743 0.338048 )
Epeak [keV] : 53.6609 ( -52.9983 256.963 )
Norm@50keV : 9.95909E-03 ( -0.01164 68.2602 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.98 using 59 PHA bins.
# Reduced chi-squared = 0.9452 for 55 degrees of freedom
# Null hypothesis probability = 5.905659e-01
Photon flux (15-150 keV) in 55.89 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] : 17.8492 (-3.35954 4.55883)
R^2/D10^2 : 1.15996E-02 (-0.00624754 0.0122783)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.64 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 57 degrees of freedom
# Null hypothesis probability = 2.271975e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.146e-08 1.202e-08
25- 50 1.906e-07 4.759e-08
50-150 4.397e-07 1.308e-07
15-150 6.717e-07 1.495e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.756931 (-0.112641 0.112616)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.41 using 59 PHA bins.
# Reduced chi-squared = 0.9897 for 57 degrees of freedom
# Null hypothesis probability = 4.970690e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.054e-07 5.991e-08
25- 50 2.028e-07 1.121e-07
50-150 4.447e-07 2.485e-07
15-150 7.528e-07 4.264e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.4372 (-3.65352 2.61713)
R1^2/D10^2 : 4.33016E-02 (-0.0236239 0.0958474)
kT2 [keV] : 199.227 (-160.487 -199.281)
R2^2/D10^2 : 2.61256E-05 (-8.36613e-06 0.00126593)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.05 using 59 PHA bins.
# Reduced chi-squared = 0.9100 for 55 degrees of freedom
# Null hypothesis probability = 6.638822e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.846e-08 3.471e-08
25- 50 2.137e-07 9.935e-08
50-150 5.367e-07 1.871e-07
15-150 8.188e-07 2.871e-07
Peak spectrum fit
Power-law model
Time interval is from 27.012 sec. to 28.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02299 ( -0.687446 0.569715 )
Norm@50keV : 4.75369E-03 ( -0.00179388 0.00168954 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.68 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 57 degrees of freedom
# Null hypothesis probability = 4.135409e-01
Photon flux (15-150 keV) in 1 sec: 0.547983 ( -0.202575 0.208272 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.09921e-08 ( -1.72787e-08 1.73415e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 27.012 sec. to 28.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.16763 ( )
Epeak [keV] : 216.489 ( )
Norm@50keV : 2.37627E-09 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.40 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 56 degrees of freedom
# Null hypothesis probability = 3.871859e-01
Photon flux (15-150 keV) in 1 sec: 0.541947 ( -0.203409 0.210826 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.04463e-08 ( -9.4626e-09 1.76947e-08 ) ergs/cm2
Band function
Time interval is from 27.012 sec. to 28.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.94535 -4.94535 )
beta : -1.34395 ( -1.55927 0.862043 )
Epeak [keV] : 40.9406 ( -40.9408 26.8508 )
Norm@50keV : 20.9390 ( -6.84543 1.82034e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.74 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 55 degrees of freedom
# Null hypothesis probability = 3.743159e-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] : 21.6273 (-7.79111 18.3206)
R^2/D10^2 : 2.07631E-02 (-0.0207092 0.0720597)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.91 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 57 degrees of freedom
# Null hypothesis probability = 3.706718e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.811e-09 1.188e-09
25- 50 9.480e-09 5.895e-09
50-150 3.311e-08 2.159e-08
15-150 4.440e-08 2.837e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-101.893 -199.363)
Norm : 2.40338 (-0.844471 0.844522)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.09 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 57 degrees of freedom
# Null hypothesis probability = 3.314139e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.985e-09 3.828e-09
25- 50 1.151e-08 6.915e-09
50-150 2.525e-08 1.559e-08
15-150 4.275e-08 2.728e-08
Double BB
R1^2/D10^2 : 7.46681E-02 ( )
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 8.59245E-05 (-8.68374e-05 0.0383313)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.57 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.65 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.63 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 55 degrees of freedom
# Reduced chi-squared = 1.048 for 55 degrees of freedom
# Reduced chi-squared = 1.048 for 55 degrees of freedom
# Null hypothesis probability = 3.128812e-01
# Null hypothesis probability = 3.775075e-01
# Null hypothesis probability = 3.780934e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.494e-09 1.179e-09
25- 50 9.258e-09 5.700e-09
50-150 3.324e-08 2.135e-08
15-150 4.499e-08 2.875e-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: 1.26839 ( -0.266422 0.256252 )
Norm@50keV : 1.50713E-03 ( -0.000221911 0.000221558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.57 using 59 PHA bins.
# Reduced chi-squared = 0.9223 for 57 degrees of freedom
# Null hypothesis probability = 6.418104e-01
Photon flux (15-150 keV) in 55.89 sec: 0.178799 ( -0.0280672 0.028225 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.38982e-07 ( -1.30077e-07 1.30968e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26882 ( -0.271355 0.255092 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.51277E-03 ( -0.000221751 0.0028215 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.57 using 59 PHA bins.
# Reduced chi-squared = 0.9388 for 56 degrees of freedom
# Null hypothesis probability = 6.053569e-01
Photon flux (15-150 keV) in 55.89 sec: 0.178956 ( -0.02833 0.027866 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.38842e-07 ( -6.6878e-08 1.30196e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.18489E-02 ( 0.297423 0.297423 )
beta : -1.38065 ( 1.36743 0.338048 )
Epeak [keV] : 53.6609 ( -52.9983 257.178 )
Norm@50keV : 9.95909E-03 ( -0.01164 68.2602 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.98 using 59 PHA bins.
# Reduced chi-squared = 0.9452 for 55 degrees of freedom
# Null hypothesis probability = 5.905659e-01
Photon flux (15-150 keV) in 55.89 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) = 1.83e-07
S(50-100 keV) = 3.05e-07
T90 vs. Hardness ratio plot
T90 = 50.1800000071526 sec.
Hardness ratio (energy fluence ratio) = 1.66667
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.82385
Count Ratio (50-100 keV) / (15-25 keV) = 1.60027
Mask shadow pattern
IMX = -8.842114871837599E-01, IMY = -4.946245927239137E-02
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:
-355.699400 -264.950000
-239.000000 -3.456000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6300 22.0086 0.3 28.7 -120.5 13.5991 44.6 0.4 Crab
125.7051 -10.9129 2.4 45.3 147.5 2.9097 4.9 ------ UNKNOWN
187.6852 60.9734 3.5 54.0 19.3 4.7035 3.3 ------ UNKNOWN
187.4862 71.6039 2.2 53.9 6.1 4.5239 5.2 ------ UNKNOWN
143.5859 64.7696 2.8 36.7 4.9 1.2708 4.2 ------ UNKNOWN
100.0023 -22.5409 3.3 57.0 179.3 5.1239 3.5 ------ UNKNOWN
102.6388 -12.6533 2.4 46.8 179.1 1.9923 4.8 ------ UNKNOWN
106.5517 21.9371 2.0 12.7 -163.9 1.1947 5.7 ------ UNKNOWN
99.8636 6.2452 2.7 29.6 -167.0 0.9927 4.2 ------ UNKNOWN
67.4852 86.5330 2.9 54.8 -19.0 3.0073 4.0 ------ UNKNOWN
11.4319 83.8638 3.1 58.6 -22.9 5.4207 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-3.456000 52.432000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.4771 21.9852 4.9 28.9 -120.4 0.2316 2.3 8.9 Crab
180.1025 51.8281 2.5 50.6 31.2 1.6927 4.7 ------ UNKNOWN
132.9909 48.4697 2.9 21.2 21.2 0.3004 4.0 ------ UNKNOWN
105.2879 -7.8488 1.1 41.5 176.8 1.3074 10.6 ------ UNKNOWN
88.4594 -9.5723 2.4 48.8 -161.9 0.8114 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
404.200600 963.120000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
147.4353 33.2376 3.4 37.7 82.8 3.2002 3.4 ------ UNKNOWN
290.9053 88.5164 2.4 23.1 -131.7 1.3903 4.8 ------ UNKNOWN
268.2673 56.0982 2.5 41.2 -77.6 6.6444 4.7 ------ UNKNOWN
Plot creation:
Sun May 31 08:28:27 EDT 2015