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
317.1528 -14.4123 0.0232 37.8436 4.4243 0.0616791 8.291 TRIG_00602278
Foreground time interval of the image:
-0.024 0.128 (delta_t = 0.152 [sec])
Background time interval of the image:
-60.888 -0.024 (delta_t = 60.864 [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 0.064000
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 0.064000
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 0.064000
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 -0.024 sec. to 0.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.08003 ( -0.259657 0.328724 )
Norm@50keV : 6.96933E-03 ( -0.00222968 0.00216681 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.67 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.265469e-01
Photon flux (15-150 keV) in 0.152 sec: 2.03191 ( -0.590726 0.591279 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32194e-08 ( -3.73348e-09 3.73348e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.23012 ( -2.3436 1.30788 )
Epeak [keV] : 44.2382 ( -7.70853 6.84055 )
Norm@50keV : 1.25379 ( -1.25379 24.7178 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.95 using 59 PHA bins.
# Reduced chi-squared = 0.6419 for 56 degrees of freedom
# Null hypothesis probability = 9.829626e-01
Photon flux (15-150 keV) in 0.152 sec: 2.98020 ( -0.65664 0.66218 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69035e-08 ( -5.7681e-09 5.76308e-09 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 0.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.23426 ( -0.930117 3.48998 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 44.2184 ( -6.96574 5.6013 )
Norm@50keV : 1.26153 ( -1.2615 28.2269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.95 using 59 PHA bins.
# Reduced chi-squared = 0.6536 for 55 degrees of freedom
# Null hypothesis probability = 9.781437e-01
Photon flux (15-150 keV) in 0.152 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] : 11.6335 (-1.98335 1.63469)
R^2/D10^2 : 0.961841 (-0.422992 0.974736)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.17 using 59 PHA bins.
# Reduced chi-squared = 0.6345 for 57 degrees of freedom
# Null hypothesis probability = 9.858487e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.172e-09 1.488e-09
25- 50 1.265e-08 3.349e-09
50-150 1.008e-08 3.773e-09
15-150 2.690e-08 6.703e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.6472 (-6.6213 6.54175)
Norm : 20.8314 (-5.81605 6.57945)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.37 using 59 PHA bins.
# Reduced chi-squared = 0.8311 for 57 degrees of freedom
# Null hypothesis probability = 8.146000e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.888e-09 1.774e-09
25- 50 8.483e-09 1.987e-09
50-150 5.566e-09 1.816e-09
15-150 2.094e-08 4.925e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.72852 (-7.91984 52.362)
R1^2/D10^2 : 1.00167 (-0.99813 -0.99813)
kT2 [keV] : 12.4759 (-12.5061 66.7192)
R2^2/D10^2 : 0.592510 (-0.584928 1.28888)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.93 using 59 PHA bins.
# Reduced chi-squared = 0.6533 for 55 degrees of freedom
# Null hypothesis probability = 9.782736e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.573e-09 7.472e-09
25- 50 1.242e-08 3.482e-08
50-150 1.000e-08 5.679e-08
15-150 2.699e-08 1.240e-07
Peak spectrum fit
Power-law model
Time interval is from -0.446 sec. to 0.554 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91468 ( -0.626963 0.728611 )
Norm@50keV : 4.37652E-03 ( -0.00193998 0.00181035 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.19 using 59 PHA bins.
# Reduced chi-squared = 0.6524 for 57 degrees of freedom
# Null hypothesis probability = 9.804825e-01
Photon flux (15-150 keV) in 1 sec: 0.632027 ( -0.224283 0.224475 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.02432e-08 ( -1.63336e-08 1.72285e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.446 sec. to 0.554 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47957 ( -1.51731 1.34285 )
Epeak [keV] : 47.0926 ( )
Norm@50keV : 8.00592E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.16 using 59 PHA bins.
# Reduced chi-squared = 0.6636 for 56 degrees of freedom
# Null hypothesis probability = 9.753494e-01
Photon flux (15-150 keV) in 1 sec: 0.625803 ( -0.22276 0.229328 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.86793e-08 ( -2.20989e-08 1.85839e-08 ) ergs/cm2
Band function
Time interval is from -0.446 sec. to 0.554 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.63044 ( -4.63044 -4.63044 )
beta : -2.68724 ( 2.68724 1.14827 )
Epeak [keV] : 31.4257 ( -31.4257 61.2146 )
Norm@50keV : 99.4644 ( -34.508 8.87602e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.38 using 59 PHA bins.
# Reduced chi-squared = 0.6615 for 55 degrees of freedom
# Null hypothesis probability = 9.751152e-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] : 8.96478 (-2.62416 4.22597)
R^2/D10^2 : 0.465509 (-0.465509 1.31921)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.40 using 59 PHA bins.
# Reduced chi-squared = 0.6562 for 57 degrees of freedom
# Null hypothesis probability = 9.791856e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.269e-09 4.450e-09
25- 50 1.536e-08 9.315e-09
50-150 5.788e-09 5.080e-09
15-150 2.841e-08 1.855e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 71.7316 (-71.7316 -71.7316)
Norm : 3.10103 (-1.36832 2.86828)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.16 using 59 PHA bins.
# Reduced chi-squared = 0.6519 for 57 degrees of freedom
# Null hypothesis probability = 9.806543e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.976e-09 5.065e-09
25- 50 1.277e-08 8.085e-09
50-150 1.670e-08 1.434e-08
15-150 3.745e-08 2.782e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.784122 (-0.769934 12.3821)
R1^2/D10^2 : 6.61193E+06 (-1.25359e+07 -1.25359e+07)
kT2 [keV] : 9.18128 (-2.7538 4.70011)
R2^2/D10^2 : 0.416977 (-0.335813 1.27549)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.21 using 59 PHA bins.
# Reduced chi-squared = 0.6765 for 55 degrees of freedom
# Null hypothesis probability = 9.684467e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.083e-09 4.406e-09
25- 50 1.515e-08 9.505e-09
50-150 6.142e-09 4.764e-09
15-150 2.838e-08 1.773e-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: 3.08003 ( -0.259657 0.328724 )
Norm@50keV : 6.96933E-03 ( -0.00222968 0.00216681 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.67 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.265469e-01
Photon flux (15-150 keV) in 0.152 sec: 2.03191 ( -0.590726 0.591279 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32194e-08 ( -3.73348e-09 3.73348e-09 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.23012 ( -2.3436 1.30788 )
Epeak [keV] : 44.2382 ( -7.70853 6.84055 )
Norm@50keV : 1.25379 ( -1.25379 24.7178 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.95 using 59 PHA bins.
# Reduced chi-squared = 0.6419 for 56 degrees of freedom
# Null hypothesis probability = 9.829626e-01
Photon flux (15-150 keV) in 0.152 sec: 2.98020 ( -0.65664 0.66218 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69035e-08 ( -5.7681e-09 5.76308e-09 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.23426 ( -0.930117 3.48998 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 44.2184 ( -6.96574 5.6013 )
Norm@50keV : 1.26153 ( -1.2615 28.2269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.95 using 59 PHA bins.
# Reduced chi-squared = 0.6536 for 55 degrees of freedom
# Null hypothesis probability = 9.781437e-01
Photon flux (15-150 keV) in 0.152 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) = 4.38e-09
S(50-100 keV) = 2.07e-09
T90 vs. Hardness ratio plot
T90 = 0.131999969482422 sec.
Hardness ratio (energy fluence ratio) = 0.472603
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 2.5406
Count Ratio (50-100 keV) / (15-25 keV) = 1.41118
Mask shadow pattern
IMX = 7.745847109252262E-01, IMY = -5.993151477292280E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
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:
-60.888000 -0.024000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4904 35.4566 11.6 39.6 -173.1 0.1378 1.0 7.0 Her X-1
268.4160 -1.4964 4.7 23.8 112.7 0.3031 2.5 3.9 SW J1753.5-0127
274.0066 -14.0382 887.3 29.0 83.8 0.0020 0.0 0.1 GX 17+2
285.0473 -24.8986 156.3 36.0 58.8 -0.0151 -0.1 1.5 HT1900.1-2455
288.7712 10.9466 0.7 0.0 -179.5 1.4041 17.1 1.6 GRS 1915+105
299.6115 35.2021 1.1 26.2 -106.7 1.2412 10.6 1.0 Cyg X-1
308.2024 40.9373 7.8 34.5 -100.7 0.2682 1.5 4.3 Cyg X-3
236.3446 12.0546 2.4 51.3 149.8 2.6231 4.9 ------ UNKNOWN
233.4307 41.9310 3.6 57.2 -173.7 1.5435 3.2 ------ UNKNOWN
332.0060 5.7111 2.4 43.0 -33.7 0.7815 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.024000 0.128000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6235 35.2940 6.3 39.4 -173.2 -0.0126 -1.8 8.6 Her X-1
268.2098 -1.4397 5.8 23.9 113.1 -0.0130 -2.0 9.5 SW J1753.5-0127
274.0944 -14.1396 5.8 29.0 83.5 0.0175 2.0 8.1 GX 17+2
285.0568 -24.9145 6.7 36.0 58.8 -0.0208 -1.7 1.2 HT1900.1-2455
288.8495 10.8305 9.4 0.1 25.0 -0.0059 -1.2 7.5 GRS 1915+105
299.7647 35.2685 61.4 26.3 -106.5 -0.0012 -0.2 9.4 Cyg X-1
308.2895 41.0293 14.3 34.6 -100.7 -0.0080 -0.8 9.3 Cyg X-3
317.1529 -14.4123 1.4 37.8 4.4 0.0617 8.3 ------ UNKNOWN
262.5487 24.1879 3.0 28.2 174.5 0.0218 3.8 ------ UNKNOWN
303.7407 -0.6863 2.7 18.9 0.1 0.0203 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
76.412590 302.192000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
285.1743 -24.7762 6.4 31.7 85.1 -0.7339 -1.8 11.5 HT1900.1-2455
288.8039 10.9506 1.0 37.9 149.7 4.6867 11.3 0.4 GRS 1915+105
299.5707 35.1951 1.4 52.4 -179.1 5.4394 8.0 1.0 Cyg X-1
308.1986 41.0115 3.8 56.1 -169.0 2.5994 3.1 5.3 Cyg X-3
326.2606 38.2063 8.0 53.3 -152.0 -1.1460 -1.5 8.1 Cyg X-2
312.2509 -27.3273 2.3 13.7 37.8 0.9908 5.0 ------ UNKNOWN
345.8748 -59.3524 2.6 49.6 0.3 1.9567 4.5 ------ UNKNOWN
5.7405 -40.2812 2.8 49.5 -29.8 1.9192 4.1 ------ UNKNOWN
319.2864 44.1995 3.6 58.7 -159.1 4.8840 3.2 ------ UNKNOWN
Plot creation:
Sat May 30 13:16:42 EDT 2015