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
330.7895 -65.5395 0.0031 38.8219 10.0825 6.3926952 61.342 TRIG_00564342
Foreground time interval of the image:
-1.076 24.380 (delta_t = 25.456 [sec])
Background time interval of the image:
-239.368 -1.076 (delta_t = 238.292 [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)
The mask-weighted light curves based on cleaned DPHs
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 -1.076 sec. to 24.380 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65230 ( -0.0468738 0.0469658 )
Norm@50keV : 1.61994E-02 ( -0.000403308 0.000403278 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.84 using 59 PHA bins.
# Reduced chi-squared = 0.9445 for 57 degrees of freedom
# Null hypothesis probability = 5.944988e-01
Photon flux (15-150 keV) in 25.46 sec: 2.11685 ( -0.0604902 0.0607274 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83494e-06 ( -9.80106e-08 9.80768e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.076 sec. to 24.380 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42235 ( -0.197439 0.189252 )
Epeak [keV] : 137.768 ( -39.3857 326.236 )
Norm@50keV : 2.06570E-02 ( -0.00366104 0.00466953 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.53 using 59 PHA bins.
# Reduced chi-squared = 0.8844 for 56 degrees of freedom
# Null hypothesis probability = 7.168025e-01
Photon flux (15-150 keV) in 25.46 sec: 2.07814 ( -0.06734 0.06774 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7819e-06 ( -1.08281e-07 1.0767e-07 ) ergs/cm2
Band function
Time interval is from -1.076 sec. to 24.380 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19302 ( -0.330276 1.44912 )
beta : -1.78700 ( 1.78627 0.118165 )
Epeak [keV] : 82.4363 ( -47.5972 98.4758 )
Norm@50keV : 2.76983E-02 ( -0.0090487 0.0955656 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.38 using 59 PHA bins.
# Reduced chi-squared = 0.8615 for 55 degrees of freedom
# Null hypothesis probability = 7.575385e-01
Photon flux (15-150 keV) in 25.46 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7637e-06 ( -3.76352e-06 -1.0795e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.6016 ( )
R^2/D10^2 : 0.193742 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 384.41 using 59 PHA bins.
# Reduced chi-squared = 6.7440 for 57 degrees of freedom
# Null hypothesis probability = 4.344505e-50
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.496e-07 1.254e-08
25- 50 1.027e-06 3.424e-08
50-150 1.731e-06 7.905e-08
15-150 3.008e-06 8.784e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 172.338 (-21.0044 26.0503)
Norm : 8.50148 (-0.263887 0.281057)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.87 using 59 PHA bins.
# Reduced chi-squared = 0.8925 for 57 degrees of freedom
# Null hypothesis probability = 7.028588e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.485e-07 2.788e-08
25- 50 1.036e-06 5.843e-08
50-150 2.160e-06 4.878e-07
15-150 3.745e-06 5.041e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.95790 (-0.775292 0.815935)
R1^2/D10^2 : 1.46132 (-0.39473 0.605376)
kT2 [keV] : 28.5107 (-3.01448 4.14523)
R2^2/D10^2 : 1.68016E-02 (-0.0065149 0.00885925)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.89 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 55 degrees of freedom
# Null hypothesis probability = 1.924694e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.805e-07 3.768e-08
25- 50 1.075e-06 4.901e-08
50-150 2.170e-06 1.603e-07
15-150 3.725e-06 2.024e-07
Peak spectrum fit
Power-law model
Time interval is from 7.424 sec. to 8.424 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53284 ( -0.0774715 0.0779907 )
Norm@50keV : 5.54340E-02 ( -0.00252905 0.00252633 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.38 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 57 degrees of freedom
# Null hypothesis probability = 2.086091e-01
Photon flux (15-150 keV) in 1 sec: 6.98325 ( -0.330172 0.330704 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.23175e-07 ( -2.55153e-08 2.55761e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.424 sec. to 8.424 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04446 ( -0.344315 0.320078 )
Epeak [keV] : 104.191 ( -23.0685 91.7249 )
Norm@50keV : 9.50822E-02 ( -0.0277306 0.042654 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.37 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 56 degrees of freedom
# Null hypothesis probability = 3.883314e-01
Photon flux (15-150 keV) in 1 sec: 6.82202 ( -0.34496 0.34581 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10916e-07 ( -2.7231e-08 2.7095e-08 ) ergs/cm2
Band function
Time interval is from 7.424 sec. to 8.424 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02215 ( -0.345683 0.479144 )
beta : -2.03739 ( 2.05438 0.416065 )
Epeak [keV] : 100.357 ( -35.4025 88.3974 )
Norm@50keV : 9.79453E-02 ( -0.031534 0.0864858 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.25 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 55 degrees of freedom
# Null hypothesis probability = 3.565866e-01
Photon flux (15-150 keV) in 1 sec: 6.81076 ( 0.18924 -0.34732 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.09481e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.9047 ( )
R^2/D10^2 : 0.649072 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 147.78 using 59 PHA bins.
# Reduced chi-squared = 2.5927 for 57 degrees of freedom
# Null hypothesis probability = 5.421662e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.399e-08 2.835e-09
25- 50 1.423e-07 8.600e-09
50-150 2.511e-07 2.315e-08
15-150 4.274e-07 2.315e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 28.6111 (-1.28583 1.28541)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.17 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 57 degrees of freedom
# Null hypothesis probability = 3.619042e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.127e-08 3.390e-09
25- 50 1.371e-07 7.050e-09
50-150 3.007e-07 1.460e-08
15-150 5.090e-07 2.680e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.14135 (-1.12713 1.41943)
R1^2/D10^2 : 10.0650 (-5.12366 11.7849)
kT2 [keV] : 22.5774 (-2.41721 3.55808)
R2^2/D10^2 : 0.156459 (-0.0687087 0.087317)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.21 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 55 degrees of freedom
# Null hypothesis probability = 2.630683e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.670e-08 1.633e-08
25- 50 1.329e-07 1.500e-08
50-150 3.037e-07 3.975e-08
15-150 5.033e-07 6.130e-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: 1.65230 ( -0.0468738 0.0469658 )
Norm@50keV : 1.61994E-02 ( -0.000403308 0.000403278 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.84 using 59 PHA bins.
# Reduced chi-squared = 0.9445 for 57 degrees of freedom
# Null hypothesis probability = 5.944988e-01
Photon flux (15-150 keV) in 25.46 sec: 2.11685 ( -0.0604902 0.0607274 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83494e-06 ( -9.80106e-08 9.80768e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42235 ( -0.197439 0.189252 )
Epeak [keV] : 137.768 ( -39.3857 326.236 )
Norm@50keV : 2.06570E-02 ( -0.00366104 0.00466953 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.53 using 59 PHA bins.
# Reduced chi-squared = 0.8844 for 56 degrees of freedom
# Null hypothesis probability = 7.168025e-01
Photon flux (15-150 keV) in 25.46 sec: 2.07814 ( -0.06734 0.06774 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7819e-06 ( -1.08281e-07 1.0767e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19302 ( -0.330276 1.44912 )
beta : -1.78700 ( 1.78627 0.118165 )
Epeak [keV] : 82.4363 ( -47.5972 98.4758 )
Norm@50keV : 2.76983E-02 ( -0.0090487 0.095487 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.38 using 59 PHA bins.
# Reduced chi-squared = 0.8615 for 55 degrees of freedom
# Null hypothesis probability = 7.575385e-01
Photon flux (15-150 keV) in 25.46 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7637e-06 ( -3.76352e-06 -1.0795e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.02e-06
S(50-100 keV) = 1.29e-06
T90 vs. Hardness ratio plot
T90 = 13.5639999508858 sec.
Hardness ratio (energy fluence ratio) = 1.26471
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.37239
Count Ratio (50-100 keV) / (15-25 keV) = 1.00123
Mask shadow pattern
IMX = 7.922234819555326E-01, IMY = -1.408675191033983E-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:
-239.368000 -1.076000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
350.6354 16.6516 3.1 50.5 152.5 2.5899 3.7 ------ UNKNOWN
291.8941 -66.3877 2.5 53.6 17.2 3.4713 4.6 ------ UNKNOWN
326.7164 -53.5174 2.4 33.9 29.0 0.9802 4.7 ------ UNKNOWN
10.4588 -35.5259 2.3 6.4 -68.3 0.7088 5.1 ------ UNKNOWN
63.5793 -55.4342 2.9 47.1 -53.1 3.0735 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.076000 24.380000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
330.7896 -65.5395 0.2 38.8 10.1 6.3925 61.2 ------ UNKNOWN
44.0057 -45.1262 3.2 33.5 -66.6 0.3765 3.6 ------ UNKNOWN
61.5355 -68.0344 2.2 48.4 -36.0 0.9608 5.3 ------ UNKNOWN
59.1662 -48.7671 2.1 44.1 -62.2 1.2487 5.5 ------ UNKNOWN
56.6755 -43.8716 2.4 42.4 -69.4 1.2381 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
789.832600 962.736500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6584 22.0223 1.2 53.0 -141.1 7.8559 10.0 1.5 Crab
135.5268 -40.5494 2.7 44.4 -25.9 0.9824 4.2 0.3 Vela X-1
67.7056 -74.5647 3.1 44.1 41.1 1.4073 3.7 ------ UNKNOWN
111.7893 -2.1863 3.7 40.8 -92.8 1.9602 3.1 ------ UNKNOWN
Plot creation:
Sat May 30 16:01:58 EDT 2015