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
285.4911 47.3849 0.0075 20.5249 -94.3089 1.4508378 25.933 TRIG_00630876
Foreground time interval of the image:
-0.296 19.480 (delta_t = 19.776 [sec])
Background time interval of the image:
-239.224 -0.296 (delta_t = 238.928 [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 0.512000
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 0.512000
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 0.512000
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 -0.296 sec. to 19.480 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49259 ( -0.106851 0.107551 )
Norm@50keV : 4.79094E-03 ( -0.000291598 0.000290601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.19 using 59 PHA bins.
# Reduced chi-squared = 0.8629 for 57 degrees of freedom
# Null hypothesis probability = 7.595896e-01
Photon flux (15-150 keV) in 19.78 sec: 0.596914 ( -0.0361199 0.0361615 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.00083e-07 ( -6.03733e-08 6.07766e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.296 sec. to 19.480 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28219 ( -0.431355 0.265955 )
Epeak [keV] : 171.848 ( )
Norm@50keV : 6.10932E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.38 using 59 PHA bins.
# Reduced chi-squared = 0.8640 for 56 degrees of freedom
# Null hypothesis probability = 7.553575e-01
Photon flux (15-150 keV) in 19.78 sec: 0.590406 ( -0.038086 0.038061 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.85169e-07 ( -6.73549e-08 6.70918e-08 ) ergs/cm2
Band function
Time interval is from -0.296 sec. to 19.480 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.633221 ( 0.935309 0.935309 )
beta : -1.57045 ( 1.55832 0.148663 )
Epeak [keV] : 52.5725 ( -52.6799 691.417 )
Norm@50keV : 1.69621E-02 ( -0.016803 407915 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.12 using 59 PHA bins.
# Reduced chi-squared = 0.8749 for 55 degrees of freedom
# Null hypothesis probability = 7.327579e-01
Photon flux (15-150 keV) in 19.78 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] : 15.2583 ( )
R^2/D10^2 : 6.26417E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 115.20 using 59 PHA bins.
# Reduced chi-squared = 2.0211 for 57 degrees of freedom
# Null hypothesis probability = 8.081170e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.022e-08 7.002e-09
25- 50 2.430e-07 1.929e-08
50-150 3.879e-07 4.797e-08
15-150 6.912e-07 5.360e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.43371 (-0.144076 0.144077)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.54 using 59 PHA bins.
# Reduced chi-squared = 0.8692 for 57 degrees of freedom
# Null hypothesis probability = 7.480221e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.202e-07 8.693e-09
25- 50 2.312e-07 1.711e-08
50-150 5.072e-07 9.544e-08
15-150 8.586e-07 1.029e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.68314 (-1.15072 1.31818)
R1^2/D10^2 : 0.706731 (-0.320666 0.685593)
kT2 [keV] : 25.7754 (-3.98507 6.28614)
R2^2/D10^2 : 8.25193E-03 (-0.00439024 0.00693865)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.88 using 59 PHA bins.
# Reduced chi-squared = 0.8523 for 55 degrees of freedom
# Null hypothesis probability = 7.739185e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.139e-07 3.039e-08
25- 50 2.259e-07 4.030e-08
50-150 5.400e-07 1.503e-07
15-150 8.798e-07 1.629e-07
Peak spectrum fit
Power-law model
Time interval is from 0.828 sec. to 1.828 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25949 ( -0.154234 0.153424 )
Norm@50keV : 1.60366E-02 ( -0.00145105 0.00144809 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.76 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 57 degrees of freedom
# Null hypothesis probability = 2.794857e-01
Photon flux (15-150 keV) in 1 sec: 1.89965 ( -0.173207 0.173347 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60092e-07 ( -1.63419e-08 1.64741e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.828 sec. to 1.828 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05484 ( -0.656394 0.285308 )
Epeak [keV] : 235.787 ( -235.868 -235.868 )
Norm@50keV : 2.03312E-02 ( -0.00556783 0.0223217 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.42 using 59 PHA bins.
# Reduced chi-squared = 1.115 for 56 degrees of freedom
# Null hypothesis probability = 2.588426e-01
Photon flux (15-150 keV) in 1 sec: 1.88638 ( -0.17773 0.17727 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57739e-07 ( -1.8119e-08 1.7831e-08 ) ergs/cm2
Band function
Time interval is from 0.828 sec. to 1.828 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.29644 ( -0.450813 -0.450813 )
beta : -1.42793 ( 1.41363 0.223593 )
Epeak [keV] : 40.3864 ( -14.7535 186.053 )
Norm@50keV : 0.774812 ( -0.898941 150.041 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.94 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 55 degrees of freedom
# Null hypothesis probability = 3.011531e-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] : 16.6447 (-1.95472 2.29573)
R^2/D10^2 : 0.158477 (-0.0558417 0.0832241)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.54 using 59 PHA bins.
# Reduced chi-squared = 1.553 for 57 degrees of freedom
# Null hypothesis probability = 4.696096e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.992e-09 1.545e-09
25- 50 3.911e-08 5.285e-09
50-150 7.683e-08 1.246e-08
15-150 1.249e-07 1.450e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 7.79426 (-0.709591 0.709566)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.54 using 59 PHA bins.
# Reduced chi-squared = 1.255 for 57 degrees of freedom
# Null hypothesis probability = 9.304604e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.941e-08 4.990e-09
25- 50 3.733e-08 1.457e-08
50-150 8.187e-08 3.803e-08
15-150 1.386e-07 6.766e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.17839 (-2.29342 2.8727)
R1^2/D10^2 : 0.803206 (-0.414247 1.00288)
kT2 [keV] : 40.7334 (-15.7707 -42.2034)
R2^2/D10^2 : 6.59089E-03 (-0.00516804 0.0121495)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.98 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 55 degrees of freedom
# Null hypothesis probability = 3.000087e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.470e-08 5.955e-09
25- 50 3.870e-08 1.419e-08
50-150 1.051e-07 5.149e-08
15-150 1.585e-07 6.932e-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: 1.49259 ( -0.106851 0.107551 )
Norm@50keV : 4.79094E-03 ( -0.000291598 0.000290601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.19 using 59 PHA bins.
# Reduced chi-squared = 0.8629 for 57 degrees of freedom
# Null hypothesis probability = 7.595896e-01
Photon flux (15-150 keV) in 19.78 sec: 0.596914 ( -0.0361199 0.0361615 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.00083e-07 ( -6.03733e-08 6.07766e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28219 ( -0.431355 0.265955 )
Epeak [keV] : 171.848 ( )
Norm@50keV : 6.10932E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.38 using 59 PHA bins.
# Reduced chi-squared = 0.8640 for 56 degrees of freedom
# Null hypothesis probability = 7.553575e-01
Photon flux (15-150 keV) in 19.78 sec: 0.590406 ( -0.038086 0.038061 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.85169e-07 ( -6.73549e-08 6.70918e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.633221 ( 0.935309 0.935309 )
beta : -1.57045 ( 1.55832 0.148668 )
Epeak [keV] : 52.5725 ( -52.6799 695.031 )
Norm@50keV : 1.69621E-02 ( -0.016803 407915 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.12 using 59 PHA bins.
# Reduced chi-squared = 0.8749 for 55 degrees of freedom
# Null hypothesis probability = 7.327579e-01
Photon flux (15-150 keV) in 19.78 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) = 2.22e-07
S(50-100 keV) = 3.15e-07
T90 vs. Hardness ratio plot
T90 = 15.4880000352859 sec.
Hardness ratio (energy fluence ratio) = 1.41892
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.48818
Count Ratio (50-100 keV) / (15-25 keV) = 1.15903
Mask shadow pattern
IMX = -2.812855980010357E-02, IMY = 3.733217457240708E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-239.224000 -0.296000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4621 35.3655 2.1 20.0 -13.5 1.0125 5.6 1.4 Her X-1
299.5619 35.2264 3.2 36.4 -89.8 2.0389 3.6 2.0 Cyg X-1
308.1079 41.0677 8.1 37.2 -104.6 0.7448 1.4 6.9 Cyg X-3
148.6109 73.0882 2.4 42.2 141.0 2.3280 4.8 ------ UNKNOWN
229.8842 27.8002 2.4 32.9 29.0 1.1288 4.7 ------ UNKNOWN
33.6154 66.6898 4.1 54.1 -175.6 1.8896 3.3 ------ UNKNOWN
33.6663 66.5227 4.0 54.2 -175.5 2.3375 3.9 ------ UNKNOWN
250.7563 10.6427 2.9 44.9 -8.7 1.1350 4.0 ------ UNKNOWN
321.9477 42.5494 2.9 44.0 -116.7 3.1052 4.0 ------ UNKNOWN
326.3319 44.0717 2.9 45.4 -121.3 3.1702 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.296000 19.480000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5337 35.4560 18.8 19.9 -13.7 0.0281 0.6 7.8 Her X-1
299.5412 35.1610 13.1 36.5 -89.7 -0.1087 -0.9 3.4 Cyg X-1
307.9865 40.9247 21.3 37.2 -104.3 0.0644 0.5 5.9 Cyg X-3
10.0311 71.6610 2.8 45.2 -170.7 0.3316 4.1 ------ UNKNOWN
285.4911 47.3849 0.4 20.5 -94.3 1.4507 25.9 ------ UNKNOWN
283.1896 43.4638 2.4 21.7 -83.0 0.2719 4.8 ------ UNKNOWN
308.6136 49.5152 2.3 32.4 -116.9 0.3529 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
337.876600 422.876000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5212 35.1435 4.7 26.1 25.0 -2.6852 -2.4 12.3 Her X-1
268.5411 -1.3943 8.7 51.0 -26.2 3.4258 1.3 11.0 SW J1753.5-0127
288.9160 11.0171 6.8 36.5 -53.9 2.7558 1.7 8.1 GRS 1915+105
299.6754 35.0681 8.6 16.3 -94.0 -1.3723 -1.3 9.0 Cyg X-1
308.1789 41.0101 6.0 17.4 -125.0 -2.0494 -1.9 4.6 Cyg X-3
326.1677 38.3140 204.2 30.8 -136.1 -0.0752 -0.1 0.5 Cyg X-2
277.2423 67.3413 2.8 20.4 122.7 4.4349 4.1 ------ UNKNOWN
327.8847 68.7809 3.6 29.9 161.2 3.6608 3.2 ------ UNKNOWN
266.2253 44.6534 2.6 13.6 37.2 3.9103 4.4 ------ UNKNOWN
262.6061 -5.3124 2.5 56.4 -20.5 17.8770 4.7 ------ UNKNOWN
290.5685 1.2534 2.1 46.4 -55.2 26.6171 5.5 ------ UNKNOWN
Plot creation:
Thu May 28 13:28:51 EDT 2015