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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.6077 -72.6410 0.0027 20.1794 171.0432 3.2045350 70.710 TRIG_00151334
Foreground time interval of the image:
-0.308 15.020 (delta_t = 15.328 [sec])
Background time interval of the image:
-209.379 -0.308 (delta_t = 209.071 [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 -0.308 sec. to 15.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31755 ( -0.0420464 0.0419576 )
Norm@50keV : 1.41210E-02 ( -0.000335697 0.000335647 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 111.71 using 59 PHA bins.
# Reduced chi-squared = 1.9598 for 57 degrees of freedom
# Null hypothesis probability = 2.040756e-05
Photon flux (15-150 keV) in 15.33 sec: 1.69023 ( -0.0434308 0.0435137 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13015e-06 ( -5.32256e-08 5.32756e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.308 sec. to 15.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.595859 ( -0.196717 0.188606 )
Epeak [keV] : 110.021 ( -12.1669 19.2127 )
Norm@50keV : 2.96300E-02 ( -0.00508386 0.00641203 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.07 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 56 degrees of freedom
# Null hypothesis probability = 2.145765e-01
Photon flux (15-150 keV) in 15.33 sec: 1.61853 ( -0.04635 0.0465 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05174e-06 ( -5.78248e-08 5.76561e-08 ) ergs/cm2
Band function
Time interval is from -0.308 sec. to 15.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.595805 ( -0.14324 0.225895 )
beta : -10.0000 ( 10 5.68434e-14 )
Epeak [keV] : 110.001 ( -7.07126 19.2159 )
Norm@50keV : 2.96311E-02 ( -0.00508688 0.00641022 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.07 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 55 degrees of freedom
# Null hypothesis probability = 1.884226e-01
Photon flux (15-150 keV) in 15.33 sec: 1.62135 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05079e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.5641 ( )
R^2/D10^2 : 9.68090E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 263.68 using 59 PHA bins.
# Reduced chi-squared = 4.6260 for 57 degrees of freedom
# Null hypothesis probability = 2.431411e-28
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.014e-07 4.752e-09
25- 50 4.795e-07 1.625e-08
50-150 1.209e-06 4.967e-08
15-150 1.789e-06 4.522e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 7.16443 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 184.81 using 59 PHA bins.
# Reduced chi-squared = 3.2422 for 57 degrees of freedom
# Null hypothesis probability = 2.081525e-15
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.735e-07 7.282e-09
25- 50 5.261e-07 1.364e-08
50-150 1.154e-06 3.204e-08
15-150 1.953e-06 4.906e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.54076 (-1.00389 1.10017)
R1^2/D10^2 : 0.669127 (-0.192805 0.305034)
kT2 [keV] : 27.4693 (-2.31226 3.1897)
R2^2/D10^2 : 2.04473E-02 (-0.00698496 0.00827202)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.61 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 55 degrees of freedom
# Null hypothesis probability = 2.243428e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.804e-07 1.594e-08
25- 50 5.080e-07 2.982e-08
50-150 1.360e-06 9.267e-08
15-150 2.049e-06 1.403e-07
Peak spectrum fit
Power-law model
Time interval is from 8.584 sec. to 9.584 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00251 ( -0.0691671 0.0685806 )
Norm@50keV : 3.48671E-02 ( -0.0014705 0.00146938 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.11 using 59 PHA bins.
# Reduced chi-squared = 1.441 for 57 degrees of freedom
# Null hypothesis probability = 1.636748e-02
Photon flux (15-150 keV) in 1 sec: 4.01486 ( -0.171753 0.17179 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.76692e-07 ( -1.71022e-08 1.7163e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.584 sec. to 9.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.198074 ( -0.325159 0.30233 )
Epeak [keV] : 128.211 ( -21.38 42.2115 )
Norm@50keV : 7.99959E-02 ( -0.0208576 0.0303827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.01 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 56 degrees of freedom
# Null hypothesis probability = 3.660398e-01
Photon flux (15-150 keV) in 1 sec: 3.91511 ( -0.17582 0.17587 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65056e-07 ( -1.8278e-08 1.821e-08 ) ergs/cm2
Band function
Time interval is from 8.584 sec. to 9.584 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.201348 ( -0.271087 0.224095 )
beta : -9.37166 ( 9.37167 19.3717 )
Epeak [keV] : 128.587 ( -12.386 40.8751 )
Norm@50keV : 7.96865E-02 ( -0.019215 0.0135922 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.01 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 55 degrees of freedom
# Null hypothesis probability = 3.311246e-01
Photon flux (15-150 keV) in 1 sec: 3.91593 ( ) 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] : 21.4576 (-1.12055 1.20153)
R^2/D10^2 : 0.160316 (-0.0254253 0.0297739)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 107.92 using 59 PHA bins.
# Reduced chi-squared = 1.8933 for 57 degrees of freedom
# Null hypothesis probability = 5.414788e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.381e-08 1.085e-09
25- 50 7.196e-08 4.425e-09
50-150 2.473e-07 1.520e-08
15-150 3.331e-07 1.580e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 16.1417 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 236.95 using 59 PHA bins.
# Reduced chi-squared = 4.1570 for 57 degrees of freedom
# Null hypothesis probability = 8.448977e-24
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.019e-08 1.890e-09
25- 50 7.732e-08 3.610e-09
50-150 1.696e-07 8.750e-09
15-150 2.871e-07 1.450e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.0768 (-2.1845 2.62602)
R1^2/D10^2 : 0.799900 (-0.326353 0.699442)
kT2 [keV] : 32.2032 (-4.93486 10.3633)
R2^2/D10^2 : 3.53016E-02 (-0.0218739 0.0292914)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.63 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 55 degrees of freedom
# Null hypothesis probability = 4.137977e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.206e-08 4.865e-09
25- 50 7.643e-08 1.260e-08
50-150 2.690e-07 7.265e-08
15-150 3.675e-07 8.525e-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: 1.31755 ( -0.0420464 0.0419576 )
Norm@50keV : 1.41210E-02 ( -0.000335697 0.000335647 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 111.71 using 59 PHA bins.
# Reduced chi-squared = 1.9598 for 57 degrees of freedom
# Null hypothesis probability = 2.040756e-05
Photon flux (15-150 keV) in 15.33 sec: 1.69023 ( -0.0434308 0.0435137 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13015e-06 ( -5.32256e-08 5.32756e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.595859 ( -0.196717 0.188606 )
Epeak [keV] : 110.021 ( -12.1669 19.2127 )
Norm@50keV : 2.96300E-02 ( -0.00508386 0.00641203 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.07 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 56 degrees of freedom
# Null hypothesis probability = 2.145765e-01
Photon flux (15-150 keV) in 15.33 sec: 1.61853 ( -0.04635 0.0465 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05174e-06 ( -5.78248e-08 5.76561e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.595805 ( -0.14324 0.225895 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 110.001 ( -7.07126 19.2159 )
Norm@50keV : 2.96311E-02 ( -0.00508688 0.00641022 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.07 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 55 degrees of freedom
# Null hypothesis probability = 1.884226e-01
Photon flux (15-150 keV) in 15.33 sec: 1.62135 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05079e-06 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 4.79e-07
S(50-100 keV) = 7.68e-07
T90 vs. Hardness ratio plot
T90 = 12.0640000104904 sec.
Hardness ratio (energy fluence ratio) = 1.60334
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.76028
Count Ratio (50-100 keV) / (15-25 keV) = 1.54613
Mask shadow pattern
IMX = -3.630394286445425E-01, IMY = -5.721907705393467E-02
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:
-209.379400 -0.308000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5196 -40.5816 2.0 38.5 -130.6 1.6539 5.8 1.7 Vela X-1
170.1160 -60.5763 2.0 9.4 -126.6 0.7984 5.7 6.5 Cen X-3
186.6481 -62.7682 0.4 2.0 -81.6 3.9317 25.9 0.3 GX 301-2
256.0476 -37.7924 4.7 46.8 36.4 1.2721 2.4 4.2 4U 1700-377
256.5802 -36.4801 9.7 48.2 35.9 0.7164 1.2 7.8 GX 349+2
264.5404 -44.4477 21.9 45.0 49.0 0.3135 0.5 8.7 4U 1735-44
19.1073 -78.4900 2.5 36.9 130.7 1.4516 4.6 ------ UNKNOWN
213.3856 -13.9895 2.2 53.3 -22.4 2.2241 5.2 ------ UNKNOWN
191.0119 -16.1967 2.6 48.3 -49.8 3.2610 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.308000 15.020000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.7366 -40.4537 40.5 38.5 -130.3 -0.0238 -0.3 11.3 Vela X-1
170.4678 -60.7542 4.9 9.2 -126.9 -0.1063 -2.3 9.1 Cen X-3
186.6773 -62.7498 4.3 2.0 -81.0 -0.1195 -2.7 1.4 GX 301-2
256.0593 -37.9864 5.3 46.7 36.5 0.3348 2.2 9.2 4U 1700-377
256.4787 -36.4831 7.5 48.1 35.8 -0.2903 -1.5 4.2 GX 349+2
264.7614 -44.3224 3.4 45.2 49.0 -0.6785 -3.4 7.7 4U 1735-44
3.1869 -72.2167 2.5 43.2 124.8 0.9500 4.6 ------ UNKNOWN
135.6077 -72.6410 0.2 20.2 171.0 3.2045 70.8 ------ UNKNOWN
106.7062 -63.5222 3.0 33.4 -179.5 0.2180 3.9 ------ UNKNOWN
197.4628 -44.4191 2.6 20.7 -34.9 0.1958 4.5 ------ UNKNOWN
149.2487 -30.2540 2.8 42.1 -107.7 0.7597 4.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
Plot creation:
Sun May 31 15:56:40 EDT 2015