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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
315.7055 -31.2647 0.0043 30.2865 20.1055 3.0959317 44.391 TRIG_00276212
Foreground time interval of the image:
-10.344 16.029 (delta_t = 26.373 [sec])
Background time interval of the image:
-239.872 -10.344 (delta_t = 229.528 [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 -10.344 sec. to 313.764 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65210 ( -0.0499664 0.0500965 )
Norm@50keV : 2.47008E-03 ( -6.14873e-05 6.14476e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.03 using 59 PHA bins.
# Reduced chi-squared = 0.7900 for 57 degrees of freedom
# Null hypothesis probability = 8.743813e-01
Photon flux (15-150 keV) in 324.1 sec: 0.322755 ( -0.00906665 0.00910569 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.44386e-06 ( -1.93077e-07 1.93525e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.344 sec. to 313.764 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65052 ( -0.188953 0.0502183 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 2.47457E-03 ( -6.16373e-05 0.000536211 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.03 using 59 PHA bins.
# Reduced chi-squared = 0.8041 for 56 degrees of freedom
# Null hypothesis probability = 8.529418e-01
Photon flux (15-150 keV) in 324.1 sec: 0.322649 ( -0.010376 0.008908 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.44403e-06 ( -1.95983e-07 1.90668e-07 ) ergs/cm2
Band function
Time interval is from -10.344 sec. to 313.764 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19541 ( 1.19357 1.19357 )
beta : -1.65949 ( -0.130752 0.0552687 )
Epeak [keV] : 47.3212 ( -47.0148 -47.0148 )
Norm@50keV : 5.21158E-03 ( -0.00285698 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.80 using 59 PHA bins.
# Reduced chi-squared = 0.8145 for 55 degrees of freedom
# Null hypothesis probability = 8.353539e-01
Photon flux (15-150 keV) in 324.1 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] : 15.3234 ( )
R^2/D10^2 : 3.05947E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 437.48 using 59 PHA bins.
# Reduced chi-squared = 7.6750 for 57 degrees of freedom
# Null hypothesis probability = 4.473131e-60
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.857e-07 2.625e-08
25- 50 1.968e-06 6.336e-08
50-150 3.173e-06 1.559e-07
15-150 5.627e-06 1.637e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 175.223 (-23.4581 -174.688)
Norm : 1.28559 (-0.0388249 0.0218221)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.41 using 59 PHA bins.
# Reduced chi-squared = 0.9720 for 57 degrees of freedom
# Null hypothesis probability = 5.350695e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.054e-06 5.477e-08
25- 50 1.996e-06 1.131e-07
50-150 4.184e-06 9.469e-07
15-150 7.234e-06 1.034e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.99516 (-0.582688 0.615558)
R1^2/D10^2 : 0.361044 (-0.095278 0.13996)
kT2 [keV] : 27.3730 (-2.31789 2.91663)
R2^2/D10^2 : 3.14840E-03 (-0.000948297 0.00119947)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.64 using 59 PHA bins.
# Reduced chi-squared = 0.9207 for 55 degrees of freedom
# Null hypothesis probability = 6.418284e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.046e-06 8.021e-08
25- 50 2.006e-06 1.055e-07
50-150 4.292e-06 2.803e-07
15-150 7.343e-06 3.614e-07
Peak spectrum fit
Power-law model
Time interval is from -0.280 sec. to 0.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25473 ( -0.216061 0.212839 )
Norm@50keV : 1.15179E-02 ( -0.00131769 0.00131662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.35 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.624044e-01
Photon flux (15-150 keV) in 1 sec: 1.36331 ( -0.160391 0.160987 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15128e-07 ( -1.48441e-08 1.49864e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.280 sec. to 0.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.40800 ( -0.36675 0.20876 )
Epeak [keV] : 135.816 ( -9999.36 -9999.36 )
Norm@50keV : 2.40130E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.25 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 56 degrees of freedom
# Null hypothesis probability = 2.932484e-01
Photon flux (15-150 keV) in 1 sec: 1.36620 ( -0.16323 0.15795 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15102e-07 ( -1.4738e-08 1.4506e-08 ) ergs/cm2
Band function
Time interval is from -0.280 sec. to 0.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.947715 ( 0.949613 0.949613 )
beta : -1.25325 ( 1.25418 0.215555 )
Epeak [keV] : 64.0114 ( -62.7115 -62.7115 )
Norm@50keV : 2.11570E-02 ( -0.0110029 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.35 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 55 degrees of freedom
# Null hypothesis probability = 2.056139e-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] : 16.9432 (-3.01695 4.18122)
R^2/D10^2 : 0.102189 (-0.0524487 0.0963442)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.38 using 59 PHA bins.
# Reduced chi-squared = 1.586 for 57 degrees of freedom
# Null hypothesis probability = 3.213038e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.980e-09 1.440e-09
25- 50 2.639e-08 4.560e-09
50-150 5.403e-08 1.252e-08
15-150 8.640e-08 1.553e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.62508 (-0.653289 0.653252)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.17 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 57 degrees of freedom
# Null hypothesis probability = 1.128949e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.401e-08 7.875e-09
25- 50 2.694e-08 1.496e-08
50-150 5.909e-08 3.252e-08
15-150 1.000e-07 5.550e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.07016 (-2.33991 2.52093)
R1^2/D10^2 : 0.634116 (-0.310562 0.92824)
kT2 [keV] : 58.1353 (-40.6505 -77.4315)
R2^2/D10^2 : 2.02367E-03 (-0.000861545 0.00594275)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.85 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 55 degrees of freedom
# Null hypothesis probability = 2.735562e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.086e-08 5.848e-09
25- 50 2.688e-08 1.128e-08
50-150 7.773e-08 4.230e-08
15-150 1.155e-07 5.333e-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: 1.30224 ( -0.0642916 0.064025 )
Norm@50keV : 7.77845E-03 ( -0.000264997 0.000264933 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.68 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.500717e-01
Photon flux (15-150 keV) in 26.37 sec: 0.928373 ( -0.0340824 0.0342008 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02583e-06 ( -7.40201e-08 7.42323e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29834 ( -0.208193 0.0658739 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 7.81083E-03 ( -0.000265572 0.000265549 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.69 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 56 degrees of freedom
# Null hypothesis probability = 4.123978e-01
Photon flux (15-150 keV) in 26.37 sec: 0.928439 ( -0.034541 0.03369 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02559e-06 ( -7.11621e-08 7.40944e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.10377E-02 ( 0.840431 0.840431 )
beta : -1.32990 ( -0.0942185 0.0738253 )
Epeak [keV] : 42.5370 ( -42.6038 96.3493 )
Norm@50keV : 6.16696E-02 ( -0.0627203 454.26 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.43 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.213846e-01
Photon flux (15-150 keV) in 26.37 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) = 1.97e-06
S(50-100 keV) = 2.51e-06
T90 vs. Hardness ratio plot
T90 = 238.008000016212 sec.
Hardness ratio (energy fluence ratio) = 1.27411
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.19345
Count Ratio (50-100 keV) / (15-25 keV) = 0.816416
Mask shadow pattern
IMX = 5.484465900865042E-01, IMY = -2.007623712409803E-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:
-239.872000 -10.344000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.7748 10.9375 1.8 36.9 117.9 2.4443 6.4 1.5 GRS 1915+105
299.5896 35.1950 0.6 43.3 157.9 7.8748 19.6 0.4 Cyg X-1
308.2579 40.9334 6.2 45.0 170.4 0.6090 1.8 6.8 Cyg X-3
326.0222 38.3288 222.9 40.3 -170.2 -0.0122 -0.1 7.0 Cyg X-2
331.0812 8.9220 2.7 13.2 -138.5 0.6725 4.3 ------ UNKNOWN
329.3924 54.7546 2.6 56.9 -169.2 2.8126 4.5 ------ UNKNOWN
339.0527 56.0991 2.7 59.4 -163.2 4.7131 4.2 ------ UNKNOWN
7.8822 -30.3529 3.1 50.7 -44.5 3.3923 3.7 ------ UNKNOWN
2.9809 12.6850 3.0 41.8 -104.7 3.2605 3.9 ------ UNKNOWN
1.2843 26.3889 2.5 46.1 -123.7 3.6642 4.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-10.344000 16.028600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.7755 10.9592 76.0 36.9 117.9 -0.0210 -0.2 1.6 GRS 1915+105
299.5466 35.0929 5.4 43.3 157.7 -0.2330 -2.1 6.9 Cyg X-1
308.2054 40.8177 29.5 44.9 170.3 0.0417 0.4 9.2 Cyg X-3
326.0085 38.3914 7.5 40.4 -170.2 -0.1200 -1.5 8.7 Cyg X-2
315.7055 -31.2648 0.3 30.3 20.1 3.0956 44.4 ------ UNKNOWN
324.7055 -7.8112 2.7 6.0 -4.4 0.2043 4.2 ------ UNKNOWN
1.8340 14.4079 2.9 41.3 -107.8 0.7743 3.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
69.628600 387.628580
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
270.4319 -25.1294 7.2 40.1 106.6 -1.2239 -1.6 8.6 GX 5-1
270.2829 -25.6257 6.2 40.1 105.8 -1.3692 -1.8 7.1 GRS 1758-258
273.9684 -14.1233 4.3 41.8 124.0 1.9905 2.7 5.7 GX 17+2
276.0698 -30.3530 12.2 33.9 100.5 -0.3711 -0.9 7.5 H1820-303
285.0290 -24.9241 36.2 27.7 115.0 0.0818 0.3 0.4 HT1900.1-2455
288.8032 10.9316 1.6 49.5 163.7 4.3156 7.2 0.9 GRS 1915+105
296.1246 -17.1235 3.5 22.7 143.4 0.6507 3.3 ------ UNKNOWN
315.6992 -31.2649 0.4 0.0 140.5 4.7358 27.0 ------ UNKNOWN
339.2061 -15.7555 3.2 26.4 -101.0 0.8747 3.6 ------ UNKNOWN
313.0878 28.0294 3.3 59.4 -163.2 4.8124 3.5 ------ UNKNOWN
11.8940 -32.7143 4.0 47.1 -53.1 2.9117 2.8 ------ UNKNOWN
Plot creation:
Sun May 31 10:31:35 EDT 2015