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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
6.7938 -23.5094 0.0122 45.7815 -158.2147 3.2905073 15.742 TRIG_00340895
Foreground time interval of the image:
-54.736 12.333 (delta_t = 67.069 [sec])
Background time interval of the image:
-115.867 -54.736 (delta_t = 61.131 [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 -54.736 sec. to 117.928 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59054 ( -0.122656 0.12352 )
Norm@50keV : 1.79701E-03 ( -0.000123608 0.000123158 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9188 for 57 degrees of freedom
# Null hypothesis probability = 6.491192e-01
Photon flux (15-150 keV) in 172.7 sec: 0.230253 ( -0.0162336 0.0162883 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90576e-06 ( -2.13357e-07 2.14362e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -54.736 sec. to 117.928 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03534 ( )
Epeak [keV] : 14.4764 ( )
Norm@50keV : 1.00744E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.79 using 59 PHA bins.
# Reduced chi-squared = 0.9249 for 56 degrees of freedom
# Null hypothesis probability = 6.346900e-01
Photon flux (15-150 keV) in 172.7 sec: 0.230200 ( -0.016246 0.016208 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90423e-06 ( -2.13405e-07 2.1287e-07 ) ergs/cm2
Band function
Time interval is from -54.736 sec. to 117.928 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97232 ( -4.97232 -4.97232 )
beta : -1.60238 ( -0.129674 0.12557 )
Epeak [keV] : 18.5937 ( -18.5937 5.56121 )
Norm@50keV : 1266.32 ( -84.7642 1.03792e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.22 using 59 PHA bins.
# Reduced chi-squared = 0.9494 for 55 degrees of freedom
# Null hypothesis probability = 5.816825e-01
Photon flux (15-150 keV) in 172.7 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] : 14.3001 ( )
R^2/D10^2 : 2.94276E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 117.64 using 59 PHA bins.
# Reduced chi-squared = 2.0639 for 57 degrees of freedom
# Null hypothesis probability = 4.177829e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.190e-07 2.988e-08
25- 50 8.318e-07 6.994e-08
50-150 1.132e-06 1.673e-07
15-150 2.183e-06 1.692e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 198.044 (-60.6154 -198.098)
Norm : 0.928431 (-0.062516 0.0726525)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.68 using 59 PHA bins.
# Reduced chi-squared = 0.9593 for 57 degrees of freedom
# Null hypothesis probability = 5.626291e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.996e-07 3.575e-08
25- 50 7.681e-07 1.083e-07
50-150 1.681e-06 5.785e-07
15-150 2.849e-06 6.407e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.44400 (-1.69204 1.64389)
R1^2/D10^2 : 0.147642 (-0.0645096 0.161254)
kT2 [keV] : 39.8345 (-12.7791 41.2464)
R2^2/D10^2 : 6.74957E-04 (-0.000555029 0.00114408)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.25 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 55 degrees of freedom
# Null hypothesis probability = 4.277939e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.651e-07 7.193e-08
25- 50 8.176e-07 1.707e-07
50-150 1.755e-06 7.818e-07
15-150 2.938e-06 9.038e-07
Peak spectrum fit
Power-law model
Time interval is from 0.084 sec. to 1.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70148 ( -0.271758 0.285864 )
Norm@50keV : 1.30217E-02 ( -0.0023121 0.00227119 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.88 using 59 PHA bins.
# Reduced chi-squared = 0.9629 for 57 degrees of freedom
# Null hypothesis probability = 5.549331e-01
Photon flux (15-150 keV) in 1 sec: 1.73032 ( -0.288255 0.288799 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20552e-07 ( -2.20693e-08 2.23802e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.084 sec. to 1.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.954246 ( -1.41944 0.614946 )
Epeak [keV] : 67.6326 ( -40.6126 -67.6326 )
Norm@50keV : 3.20044E-02 ( -0.0320043 0.142352 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.57 using 59 PHA bins.
# Reduced chi-squared = 0.9567 for 56 degrees of freedom
# Null hypothesis probability = 5.672393e-01
Photon flux (15-150 keV) in 1 sec: 1.68718 ( -0.29607 0.296 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15328e-07 ( -2.35292e-08 2.3865e-08 ) ergs/cm2
Band function
Time interval is from 0.084 sec. to 1.084 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.945124 ( 0.945108 5.84623 )
beta : -2.72022 ( 2.71819 8.3374 )
Epeak [keV] : 66.9678 ( -66.9664 214.705 )
Norm@50keV : 3.24601E-02 ( -0.0324613 441.631 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.58 using 59 PHA bins.
# Reduced chi-squared = 0.9741 for 55 degrees of freedom
# Null hypothesis probability = 5.291708e-01
Photon flux (15-150 keV) in 1 sec: 1.68835 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15499e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.2490 (-2.45011 2.96352)
R^2/D10^2 : 0.302074 (-0.157472 0.330301)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.21 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 57 degrees of freedom
# Null hypothesis probability = 3.604894e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.124e-08 3.610e-09
25- 50 3.951e-08 1.028e-08
50-150 4.433e-08 1.480e-08
15-150 9.507e-08 2.590e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 134.581 (-62.1774 -132.285)
Norm : 7.21317 (-1.34078 1.84551)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.81 using 59 PHA bins.
# Reduced chi-squared = 0.9441 for 57 degrees of freedom
# Null hypothesis probability = 5.953313e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.868e-08 7.555e-09
25- 50 3.405e-08 1.852e-08
50-150 6.414e-08 4.088e-08
15-150 1.169e-07 6.939e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.42308 (-3.24627 4.58572)
R1^2/D10^2 : 2.40359 (-1.9319 4.59528)
kT2 [keV] : 20.7076 (-6.56035 38.1718)
R2^2/D10^2 : 4.47276E-02 (-0.0435249 0.169145)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.37 using 59 PHA bins.
# Reduced chi-squared = 0.9703 for 55 degrees of freedom
# Null hypothesis probability = 5.372018e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.808e-08 9.890e-09
25- 50 3.521e-08 1.847e-08
50-150 6.128e-08 3.567e-08
15-150 1.146e-07 6.010e-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: 1.61302 ( -0.132387 0.133462 )
Norm@50keV : 3.24850E-03 ( -0.000252127 0.000251186 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.79 using 59 PHA bins.
# Reduced chi-squared = 0.9087 for 57 degrees of freedom
# Null hypothesis probability = 6.701679e-01
Photon flux (15-150 keV) in 67.07 sec: 0.419147 ( -0.0331965 0.0332774 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03446e-06 ( -1.66971e-07 1.67774e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37767 ( -0.582932 0.347192 )
Epeak [keV] : 132.025 ( -62.6113 -132.058 )
Norm@50keV : 4.27949E-03 ( -0.00427903 0.00407949 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.21 using 59 PHA bins.
# Reduced chi-squared = 0.9145 for 56 degrees of freedom
# Null hypothesis probability = 6.564301e-01
Photon flux (15-150 keV) in 67.07 sec: 0.414716 ( -0.034606 0.034603 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00245e-06 ( -1.85073e-07 1.8243e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.763904 ( 0.815421 0.815421 )
beta : -1.81168 ( 1.79222 0.248463 )
Epeak [keV] : 58.7624 ( -58.4719 77.2738 )
Norm@50keV : 9.93107E-03 ( -0.0100522 272.06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.72 using 59 PHA bins.
# Reduced chi-squared = 0.9040 for 55 degrees of freedom
# Null hypothesis probability = 6.759994e-01
Photon flux (15-150 keV) in 67.07 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98457e-06 ( -1.9841e-06 -1.77078e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 7.50e-07
S(50-100 keV) = 9.96e-07
T90 vs. Hardness ratio plot
T90 = 137.344000011683 sec.
Hardness ratio (energy fluence ratio) = 1.328
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.27556
Count Ratio (50-100 keV) / (15-25 keV) = 0.881787
Mask shadow pattern
IMX = -9.542634991640637E-01, IMY = 3.813943852629045E-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:
-115.867400 -54.736000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.8884 10.7297 176.6 53.2 -36.3 -0.0252 -0.1 14.0 GRS 1915+105
299.5942 35.2115 0.8 43.4 -3.2 1.8632 14.8 0.6 Cyg X-1
308.1340 41.0696 2.6 39.3 8.7 0.5232 4.4 7.1 Cyg X-3
326.1219 38.4948 4.9 27.0 21.3 -0.2027 -2.3 10.7 Cyg X-2
337.7985 20.2318 2.5 6.7 0.0 0.3232 4.5 ------ UNKNOWN
18.9612 -15.1652 2.7 47.0 -177.8 0.6157 4.3 ------ UNKNOWN
357.0512 -0.8801 2.9 21.7 -167.2 0.3205 4.0 184.6 UNKNOWN
343.1554 -2.5607 2.6 18.8 -126.8 0.3641 4.5 ------ UNKNOWN
357.4778 -27.8036 2.7 46.0 -145.1 0.7265 4.3 ------ UNKNOWN
0.3808 -36.0829 2.4 54.7 -144.5 2.5763 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-54.736000 12.332590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.8055 10.9121 5.9 53.3 -36.1 1.0082 2.0 2.1 GRS 1915+105
299.6710 35.2519 4.7 43.4 -3.2 -0.4471 -2.5 5.0 Cyg X-1
308.1158 40.8558 3.4 39.2 8.4 0.5616 3.4 5.8 Cyg X-3
326.0707 38.4749 3.9 27.0 21.2 0.3758 2.9 10.4 Cyg X-2
6.7938 -23.5094 0.7 45.8 -158.2 3.2906 15.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
88.332600 962.283800
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
29.5675 12.1628 2.9 42.0 43.0 4.7183 4.0 ------ UNKNOWN
40.5819 -78.4655 3.3 57.1 -179.0 10.1708 3.5 ------ UNKNOWN
359.1349 10.7351 2.6 35.0 -4.6 2.6493 4.4 ------ UNKNOWN
338.7684 -35.3284 3.3 27.0 -113.8 2.1743 3.5 ------ UNKNOWN
326.0714 0.1032 4.2 46.0 -56.5 6.7706 2.8 ------ UNKNOWN
318.9279 -37.6830 4.2 43.1 -112.2 6.2174 2.7 ------ UNKNOWN
Plot creation:
Sun May 31 04:58:47 EDT 2015