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
253.8582 -12.8744 0.0067 18.3602 40.9842 1.7073659 28.735 TRIG_00589685
Foreground time interval of the image:
-0.088 20.773 (delta_t = 20.861 [sec])
Background time interval of the image:
-239.528 -0.088 (delta_t = 239.440 [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)
The mask-weighted light curves based on cleaned DPHs
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 -0.088 sec. to 116.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07642 ( -0.0942696 0.0928321 )
Norm@50keV : 2.24966E-03 ( -0.000110418 0.000109964 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.43 using 59 PHA bins.
# Reduced chi-squared = 0.9198 for 57 degrees of freedom
# Null hypothesis probability = 6.470707e-01
Photon flux (15-150 keV) in 116.2 sec: 0.260382 ( -0.0134463 0.0135027 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75403e-06 ( -1.37921e-07 1.38587e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.088 sec. to 116.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07347 ( -0.0970691 0.0915125 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.26140E-03 ( -0.000111178 0.000629006 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.46 using 59 PHA bins.
# Reduced chi-squared = 0.9367 for 56 degrees of freedom
# Null hypothesis probability = 6.097662e-01
Photon flux (15-150 keV) in 116.2 sec: 0.260526 ( -0.006894 0.013241 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75395e-06 ( -1.37186e-07 1.37104e-07 ) ergs/cm2
Band function
Time interval is from -0.088 sec. to 116.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.852930 ( 0.85293 0.85293 )
beta : -1.07641 ( -0.0928106 0.0943123 )
Epeak [keV] : 57.6013 ( -57.6013 -57.6013 )
Norm@50keV : 3.92816E-03 ( -0.00141687 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.43 using 59 PHA bins.
# Reduced chi-squared = 0.9532 for 55 degrees of freedom
# Null hypothesis probability = 5.735459e-01
Photon flux (15-150 keV) in 116.2 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] : 23.3630 ( )
R^2/D10^2 : 7.30152E-03 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 133.77 using 59 PHA bins.
# Reduced chi-squared = 2.3468 for 57 degrees of freedom
# Null hypothesis probability = 4.108501e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.329e-08 9.011e-09
25- 50 4.558e-07 3.730e-08
50-150 1.857e-06 1.360e-07
15-150 2.396e-06 1.394e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 1.11714 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 135.08 using 59 PHA bins.
# Reduced chi-squared = 2.3698 for 57 degrees of freedom
# Null hypothesis probability = 2.771262e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.232e-07 1.807e-08
25- 50 6.218e-07 3.591e-08
50-150 1.364e-06 2.520e-07
15-150 2.309e-06 2.795e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.58462 (-1.2953 1.5992)
R1^2/D10^2 : 0.257540 (-0.13828 0.346913)
kT2 [keV] : 32.4593 (-3.95344 5.93041)
R2^2/D10^2 : 2.39515E-03 (-0.000964357 0.0012216)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.69 using 59 PHA bins.
# Reduced chi-squared = 0.9398 for 55 degrees of freedom
# Null hypothesis probability = 6.020169e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.384e-07 6.751e-08
25- 50 5.139e-07 8.703e-08
50-150 2.027e-06 2.138e-07
15-150 2.779e-06 3.056e-07
Peak spectrum fit
Power-law model
Time interval is from -0.098 sec. to 0.902 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.899131 ( -0.164133 0.158447 )
Norm@50keV : 1.52232E-02 ( -0.00147894 0.00147094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.99 using 59 PHA bins.
# Reduced chi-squared = 0.9121 for 57 degrees of freedom
# Null hypothesis probability = 6.630506e-01
Photon flux (15-150 keV) in 1 sec: 1.74728 ( -0.169545 0.170092 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70905e-07 ( -1.70902e-08 1.71842e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.098 sec. to 0.902 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.187969 ( -0.877655 0.719018 )
Epeak [keV] : 114.459 ( -28.593 107.891 )
Norm@50keV : 4.62132E-02 ( -0.0236368 0.0634357 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.73 using 59 PHA bins.
# Reduced chi-squared = 0.7987 for 56 degrees of freedom
# Null hypothesis probability = 8.604670e-01
Photon flux (15-150 keV) in 1 sec: 1.66906 ( -0.17675 0.17719 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60438e-07 ( -1.9469e-08 1.9144e-08 ) ergs/cm2
Band function
Time interval is from -0.098 sec. to 0.902 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.857615 ( 0.857616 0.857616 )
beta : -0.899097 ( -0.158372 0.163849 )
Epeak [keV] : 13.8131 ( )
Norm@50keV : 2.28525E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.99 using 59 PHA bins.
# Reduced chi-squared = 0.9453 for 55 degrees of freedom
# Null hypothesis probability = 5.903802e-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] : 21.9128 (-2.57407 3.10863)
R^2/D10^2 : 6.54766E-02 (-0.0221693 0.0317848)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.04 using 59 PHA bins.
# Reduced chi-squared = 0.8779 for 57 degrees of freedom
# Null hypothesis probability = 7.314831e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.829e-09 1.069e-09
25- 50 3.075e-08 4.430e-09
50-150 1.103e-07 1.915e-08
15-150 1.469e-07 1.915e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 7.07863 (-0.709904 0.709834)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 93.13 using 59 PHA bins.
# Reduced chi-squared = 1.634 for 57 degrees of freedom
# Null hypothesis probability = 1.784682e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.763e-08 9.765e-09
25- 50 3.392e-08 1.805e-08
50-150 7.438e-08 4.021e-08
15-150 1.259e-07 6.144e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 14.4671 (-5.3129 4.77109)
R1^2/D10^2 : 0.162709 (-0.0810856 0.241225)
kT2 [keV] : 55.5374 (-28.704 -55.4983)
R2^2/D10^2 : 2.67190E-03 (-0.00235196 0.0267019)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.89 using 59 PHA bins.
# Reduced chi-squared = 0.7617 for 55 degrees of freedom
# Null hypothesis probability = 9.033344e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.996e-09 4.143e-09
25- 50 3.365e-08 1.769e-08
50-150 1.210e-07 6.085e-08
15-150 1.626e-07 7.838e-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: 0.870110 ( -0.105837 0.103255 )
Norm@50keV : 5.06061E-03 ( -0.00029582 0.000293341 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.16 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.141645e-01
Photon flux (15-150 keV) in 20.86 sec: 0.580814 ( -0.0336189 0.0337507 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19872e-06 ( -6.79779e-08 6.81467e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.666901 ( -0.446503 0.297543 )
Epeak [keV] : 404.486 ( -404.486 -404.486 )
Norm@50keV : 6.12334E-03 ( -0.00127506 0.00303089 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.45 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 56 degrees of freedom
# Null hypothesis probability = 2.051391e-01
Photon flux (15-150 keV) in 20.86 sec: 0.574253 ( -0.035978 0.036044 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18855e-06 ( -7.23383e-08 7.16854e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.774173 ( 0.774174 0.774174 )
beta : -0.870114 ( -0.103169 0.105975 )
Epeak [keV] : 22.8902 ( )
Norm@50keV : 7.66615E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.16 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 55 degrees of freedom
# Null hypothesis probability = 1.642382e-01
Photon flux (15-150 keV) in 20.86 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) = 5.36e-07
S(50-100 keV) = 1.02e-06
T90 vs. Hardness ratio plot
T90 = 98.7239999771118 sec.
Hardness ratio (energy fluence ratio) = 1.90299
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.38539
Count Ratio (50-100 keV) / (15-25 keV) = 1.45125
Mask shadow pattern
IMX = 2.505370543007930E-01, IMY = -2.176673394470010E-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:
-239.528000 -0.088000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9849 -15.6384 0.4 27.1 47.2 8.9700 28.3 0.3 Sco X-1
254.6512 35.4858 0.0 39.1 152.3 0.1526 0.3 12.8 Her X-1
256.0073 -37.8492 1.5 38.1 6.0 2.7147 7.8 1.0 4U 1700-377
256.5610 -36.5252 6.0 36.7 6.1 -0.6627 -1.9 8.6 GX 349+2
262.9537 -24.6679 4.1 23.8 2.4 0.7002 2.8 5.5 GX 1+4
264.7620 -44.4113 5.8 43.1 -6.1 -0.7691 -2.0 2.5 4U 1735-44
268.3822 -1.5286 6.5 0.1 -18.2 0.3690 1.8 4.6 SW J1753.5-0127
270.1441 -25.0066 3.9 23.6 -13.9 0.7348 3.0 8.8 GX 5-1
270.2921 -25.6421 4.8 24.3 -14.1 0.6052 2.4 6.1 GRS 1758-258
273.9583 -14.0645 3.2 13.8 -33.2 0.8630 3.6 3.2 GX 17+2
275.7379 -30.5006 0.0 29.9 -22.7 0.5573 2.1 12.6 H1820-303
284.9945 -24.8244 8.2 28.4 -43.0 0.3705 1.4 6.2 HT1900.1-2455
288.7945 10.9312 0.8 23.8 -131.7 3.6428 14.4 0.9 GRS 1915+105
299.5944 35.1648 2.5 46.8 -154.3 2.3762 4.6 2.2 Cyg X-1
307.9803 40.9756 7.0 55.6 -154.2 1.9381 1.6 6.0 Cyg X-3
262.8646 -33.7136 5.9 32.7 -1.4 0.5874 2.0 9.6 GX 354-0
229.1247 -0.8282 2.5 39.2 80.6 4.5986 4.6 ------ UNKNOWN
237.7684 36.8937 2.6 47.7 136.7 4.2453 4.4 ------ UNKNOWN
237.5862 -18.9163 2.5 34.9 48.0 2.1543 4.7 ------ UNKNOWN
265.9252 4.5639 2.5 6.5 148.0 0.9892 4.7 ------ UNKNOWN
266.1468 -28.7481 0.4 27.4 -5.6 7.1310 26.7 ------ UNKNOWN
UNKNOWN
UNKNOWN
UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.088000 20.772580
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0466 -15.5651 5.1 27.0 47.3 -0.1819 -2.3 5.9 Sco X-1
254.3142 35.3920 4.1 39.1 151.8 -0.2777 -2.8 7.6 Her X-1
256.1178 -37.9227 3.6 38.2 5.8 0.2720 3.2 7.8 4U 1700-377
256.4145 -36.3856 3.1 36.6 6.4 0.3025 3.7 2.5 GX 349+2
262.8758 -24.7682 5.2 23.9 2.5 0.1327 2.2 7.4 GX 1+4
264.7497 -44.4526 316.6 43.1 -6.1 0.0035 0.0 0.3 4U 1735-44
268.5109 -1.5068 5.4 0.2 -78.1 0.1153 2.1 9.2 SW J1753.5-0127
270.3290 -24.9343 8.9 23.6 -14.3 0.0721 1.3 9.0 GX 5-1
270.2200 -25.5815 3.7 24.2 -13.9 -0.1780 -3.1 10.7 GRS 1758-258
273.8295 -14.1615 0.0 13.8 -32.6 -0.1011 -1.8 12.7 GX 17+2
276.0884 -30.3399 9.2 29.8 -23.4 0.0737 1.3 8.6 H1820-303
285.1573 -25.0668 5.4 28.6 -43.0 -0.1317 -2.2 11.0 HT1900.1-2455
288.6440 10.9130 11.1 23.7 -131.9 0.0655 1.0 9.3 GRS 1915+105
299.4624 35.2590 6.0 46.8 -154.5 -0.2046 -1.9 7.2 Cyg X-1
308.1058 40.9533 375.0 55.7 -154.1 0.0068 0.0 0.2 Cyg X-3
263.0216 -33.9333 4.4 32.9 -1.7 0.1899 2.6 6.1 GX 354-0
243.6314 -10.6199 2.3 26.2 58.7 0.4092 5.0 ------ UNKNOWN
253.8582 -12.8744 0.4 18.4 41.0 1.7070 28.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
60.772610 708.572600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9720 -15.6407 0.2 9.0 64.5 24.7916 51.0 0.4 Sco X-1
254.5243 35.4176 2.9 48.3 174.1 4.3427 4.0 5.6 Her X-1
255.9903 -37.8292 0.8 25.0 -10.6 6.8194 13.7 0.9 4U 1700-377
256.2947 -36.4662 933.7 23.7 -11.5 0.0059 0.0 7.3 GX 349+2
262.9210 -24.7276 2.1 14.6 -41.2 2.4941 5.6 4.9 GX 1+4
264.5617 -44.6014 19.0 33.0 -20.7 -0.3466 -0.6 11.9 4U 1735-44
268.5046 -1.6132 78.1 18.4 -133.3 -0.0709 -0.1 12.6 SW J1753.5-0127
270.2700 -25.1129 1.7 19.7 -55.9 3.2680 6.9 2.2 GX 5-1
270.2933 -25.7289 3.1 20.1 -54.5 1.8064 3.8 1.0 GRS 1758-258
274.0344 -14.0474 2.2 19.6 -90.9 2.7495 5.2 1.8 GX 17+2
276.0101 -30.3226 5.9 26.9 -52.7 1.0751 1.9 5.2 H1820-303
285.0326 -24.7895 405.3 31.7 -70.0 0.0204 0.0 7.9 HT1900.1-2455
288.7899 10.9377 1.2 42.1 -129.6 10.2111 9.9 0.7 GRS 1915+105
263.0064 -33.7126 3.3 22.4 -26.9 1.6494 3.5 7.4 GX 354-0
266.1296 -28.7556 0.3 19.6 -40.5 14.4142 33.0 ------ UNKNOWN
274.8275 -12.6857 4.0 20.4 -94.8 1.3790 2.9 ------ UNKNOWN
Plot creation:
Sat May 30 14:20:33 EDT 2015