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
233.9504 -28.7682 0.0064 42.3520 -47.0202 1.3267173 29.911 TRIG_00529686
Foreground time interval of the image:
-0.164 0.832 (delta_t = 0.996 [sec])
Background time interval of the image:
-239.936 -0.164 (delta_t = 239.772 [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)
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 -0.164 sec. to 0.832 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33900 ( -0.0818753 0.0817444 )
Norm@50keV : 8.99961E-02 ( -0.00434592 0.00434591 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.65 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 57 degrees of freedom
# Null hypothesis probability = 3.795115e-01
Photon flux (15-150 keV) in 0.996 sec: 10.8177 ( -0.552276 0.553207 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.7764e-07 ( -4.53107e-08 4.5388e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.164 sec. to 0.832 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.971965 ( -0.346363 0.321932 )
Epeak [keV] : 156.107 ( -50.1577 562.258 )
Norm@50keV : 0.133118 ( -0.0378822 0.0573041 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.83 using 59 PHA bins.
# Reduced chi-squared = 0.9970 for 56 degrees of freedom
# Null hypothesis probability = 4.812850e-01
Photon flux (15-150 keV) in 0.996 sec: 10.6574 ( -0.5684 0.5693 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.65974e-07 ( -4.72303e-08 4.70411e-08 ) ergs/cm2
Band function
Time interval is from -0.164 sec. to 0.832 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.796600 ( -0.413136 0.795993 )
beta : -1.55157 ( 1.55123 0.220593 )
Epeak [keV] : 108.860 ( -54.3117 417.584 )
Norm@50keV : 0.168369 ( -0.0714666 0.598597 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.67 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 55 degrees of freedom
# Null hypothesis probability = 4.492409e-01
Photon flux (15-150 keV) in 0.996 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] : 18.2173 ( )
R^2/D10^2 : 0.663832 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 139.07 using 59 PHA bins.
# Reduced chi-squared = 2.4398 for 57 degrees of freedom
# Null hypothesis probability = 8.232260e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.376e-08 4.218e-09
25- 50 2.042e-07 1.335e-08
50-150 4.934e-07 4.064e-08
15-150 7.414e-07 4.636e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 45.4335 (-2.21257 2.21211)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.28 using 59 PHA bins.
# Reduced chi-squared = 1.373 for 57 degrees of freedom
# Null hypothesis probability = 3.226497e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.127e-07 6.524e-09
25- 50 2.167e-07 1.150e-08
50-150 4.753e-07 2.615e-08
15-150 8.047e-07 4.597e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.08435 (-1.5588 1.80149)
R1^2/D10^2 : 5.96482 (-2.66452 5.95444)
kT2 [keV] : 29.7467 (-4.56207 8.15014)
R2^2/D10^2 : 0.100545 (-0.0571806 0.0850876)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.33 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 55 degrees of freedom
# Null hypothesis probability = 3.888461e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.469e-08 1.547e-08
25- 50 2.118e-07 3.471e-08
50-150 5.715e-07 1.216e-07
15-150 8.679e-07 1.425e-07
Peak spectrum fit
Power-law model
Time interval is from -0.164 sec. to 0.836 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34272 ( -0.08193 0.0818164 )
Norm@50keV : 8.97295E-02 ( -0.00433422 0.00433422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.03 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 57 degrees of freedom
# Null hypothesis probability = 4.010888e-01
Photon flux (15-150 keV) in 1 sec: 10.7938 ( -0.551044 0.551971 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.7781e-07 ( -4.53548e-08 4.54308e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.164 sec. to 0.836 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.978508 ( -0.346331 0.321916 )
Epeak [keV] : 156.159 ( -50.4158 592.59 )
Norm@50keV : 0.132373 ( -0.0376983 0.0570548 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.27 using 59 PHA bins.
# Reduced chi-squared = 0.9870 for 56 degrees of freedom
# Null hypothesis probability = 5.023678e-01
Photon flux (15-150 keV) in 1 sec: 10.6346 ( -0.5672 0.5682 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.66152e-07 ( -4.7291e-08 4.7097e-08 ) ergs/cm2
Band function
Time interval is from -0.164 sec. to 0.836 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.802588 ( -0.510345 0.802626 )
beta : -1.55307 ( 1.55292 0.22065 )
Epeak [keV] : 108.536 ( -78.2437 438.788 )
Norm@50keV : 0.167595 ( -0.0710051 0.581659 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.12 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 55 degrees of freedom
# Null hypothesis probability = 4.700898e-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] : 18.1594 ( )
R^2/D10^2 : 0.668700 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 138.92 using 59 PHA bins.
# Reduced chi-squared = 2.4371 for 57 degrees of freedom
# Null hypothesis probability = 8.634704e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.402e-08 3.975e-09
25- 50 2.049e-07 1.350e-08
50-150 4.917e-07 3.730e-08
15-150 7.406e-07 4.290e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 45.3145 (-2.20675 2.20631)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.98 using 59 PHA bins.
# Reduced chi-squared = 1.351 for 57 degrees of freedom
# Null hypothesis probability = 4.010161e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.129e-07 6.400e-09
25- 50 2.171e-07 1.200e-08
50-150 4.762e-07 2.675e-08
15-150 8.062e-07 4.655e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.07534 (-1.54554 1.78124)
R1^2/D10^2 : 5.99621 (-2.67053 5.93181)
kT2 [keV] : 29.7378 (-4.55344 8.08574)
R2^2/D10^2 : 0.100108 (-0.056772 0.0846604)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.72 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 55 degrees of freedom
# Null hypothesis probability = 4.106332e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.512e-08 1.854e-08
25- 50 2.122e-07 3.285e-08
50-150 5.707e-07 1.246e-07
15-150 8.681e-07 1.500e-07
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: 1.33900 ( -0.0818753 0.0817444 )
Norm@50keV : 8.99961E-02 ( -0.00434592 0.00434591 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.65 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 57 degrees of freedom
# Null hypothesis probability = 3.795115e-01
Photon flux (15-150 keV) in 0.996 sec: 10.8177 ( -0.552276 0.553207 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.7764e-07 ( -4.53107e-08 4.5388e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.971965 ( -0.346363 0.321932 )
Epeak [keV] : 156.107 ( -50.1577 562.258 )
Norm@50keV : 0.133118 ( -0.0378822 0.0573041 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.83 using 59 PHA bins.
# Reduced chi-squared = 0.9970 for 56 degrees of freedom
# Null hypothesis probability = 4.812850e-01
Photon flux (15-150 keV) in 0.996 sec: 10.6574 ( -0.5684 0.5693 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.65974e-07 ( -4.72303e-08 4.70411e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.796600 ( -0.413136 0.795993 )
beta : -1.55157 ( 1.55123 0.220593 )
Epeak [keV] : 108.860 ( -54.3117 417.584 )
Norm@50keV : 0.168369 ( -0.0714666 0.598597 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.67 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 55 degrees of freedom
# Null hypothesis probability = 4.492409e-01
Photon flux (15-150 keV) in 0.996 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) = 2.00e-07
S(50-100 keV) = 3.16e-07
T90 vs. Hardness ratio plot
T90 = 0.807999968528748 sec.
Hardness ratio (energy fluence ratio) = 1.58
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.69131
Count Ratio (50-100 keV) / (15-25 keV) = 1.58809
Mask shadow pattern
IMX = 6.214673431926222E-01, IMY = 6.669133243108158E-01
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:
-239.936000 -0.164000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9874 -15.6293 0.4 41.0 -22.0 8.0807 26.5 0.8 Sco X-1
256.0050 -37.7935 16.6 22.1 -52.5 0.1442 0.7 3.2 4U 1700-377
256.4310 -36.4383 2.9 22.0 -48.8 0.7880 3.9 0.9 GX 349+2
262.8469 -24.6675 4.2 22.4 -14.0 0.5355 2.8 10.0 GX 1+4
264.7196 -44.4757 19.1 15.9 -74.6 0.1277 0.6 1.8 4U 1735-44
268.4544 -1.3680 9.6 39.3 20.7 0.3639 1.2 7.3 SW J1753.5-0127
270.2156 -25.0843 2.0 17.4 -0.6 1.0894 5.7 3.7 GX 5-1
270.5259 -25.7651 8.2 16.7 -1.4 0.2695 1.4 12.1 GRS 1758-258
274.0674 -14.1014 4.2 25.4 22.8 0.5580 2.7 5.3 GX 17+2
275.7100 -30.3302 3.3 10.3 1.0 0.6444 3.5 11.3 H1820-303
284.9768 -24.7642 7.9 13.2 49.5 0.2719 1.5 9.9 HT1900.1-2455
262.9226 -33.6936 57.0 17.6 -36.7 0.0405 0.2 9.1 GX 354-0
288.6251 -1.9638 3.0 36.2 53.6 1.5253 3.9 ------ UNKNOWN
331.5754 -49.8569 3.4 35.6 171.2 0.9718 3.4 ------ UNKNOWN
296.7919 -46.9074 2.5 13.0 -176.1 0.8384 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.164000 0.832000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0479 -15.4815 5.9 41.0 -21.8 -0.0447 -2.0 10.3 Sco X-1
256.0820 -37.6775 6.0 22.0 -52.2 -0.0341 -1.9 11.0 4U 1700-377
256.2741 -36.4886 5.0 22.1 -49.0 -0.0407 -2.3 8.7 GX 349+2
263.1133 -24.6363 10.0 22.2 -13.5 -0.0161 -1.2 8.7 GX 1+4
264.8929 -44.4850 5.9 15.8 -74.7 0.0308 2.0 6.8 4U 1735-44
268.2932 -1.4845 8.2 39.2 20.4 0.0306 1.4 4.9 SW J1753.5-0127
270.2456 -25.2650 19.8 17.2 -0.9 0.0084 0.6 11.3 GX 5-1
270.1291 -25.7765 2700.0 16.9 -2.3 0.0000 0.0 9.6 GRS 1758-258
273.9360 -13.9007 5.9 25.6 22.6 0.0289 2.0 9.1 GX 17+2
276.1685 -30.3818 0.0 10.0 2.6 -0.0163 -1.2 12.6 H1820-303
284.9767 -25.0731 5.5 12.8 49.6 0.0294 2.1 9.7 HT1900.1-2455
263.0445 -33.9770 6.1 17.4 -37.5 0.0278 1.9 9.0 GX 354-0
233.9504 -28.7682 0.4 42.4 -47.0 1.3268 29.9 ------ UNKNOWN
239.6601 -80.8995 2.3 45.9 -125.2 0.4080 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
77.364590 933.764610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4383 -60.4294 4.8 52.3 -156.9 5.3854 2.4 12.2 Cen X-3
186.6775 -62.7928 0.6 45.6 -162.7 29.5356 18.3 1.5 GX 301-2
244.9792 -15.6325 0.1 16.6 29.3 59.1010 89.9 0.5 Sco X-1
255.9035 -37.9892 17.6 20.4 111.7 0.5117 0.7 9.6 4U 1700-377
256.2504 -36.4809 3.4 20.2 107.4 2.7988 3.4 9.6 GX 349+2
262.8800 -24.6123 5.6 26.1 76.9 2.0913 2.0 10.7 GX 1+4
264.7969 -44.5768 4.9 29.1 120.5 -2.4740 -2.4 8.0 4U 1735-44
268.4921 -1.6075 3.3 42.7 45.9 6.0156 3.5 11.9 SW J1753.5-0127
270.2272 -25.0821 3.4 32.4 81.4 4.5341 3.4 3.1 GX 5-1
270.3821 -25.7087 3.2 32.4 82.6 4.8865 3.6 4.8 GRS 1758-258
274.1242 -13.9508 228.9 40.0 66.1 -0.1297 -0.1 8.6 GX 17+2
275.8595 -30.5015 9.2 36.2 92.5 2.5452 1.3 8.8 H1820-303
262.9902 -33.8170 143.3 25.2 98.1 -0.0764 -0.1 1.1 GX 354-0
255.3930 -21.0571 3.0 20.9 62.4 3.2021 3.8 ------ UNKNOWN
252.8170 -40.2012 2.5 19.2 120.7 3.3042 4.6 ------ UNKNOWN
205.5682 -41.4223 3.3 26.3 -137.2 2.6643 3.5 ------ UNKNOWN
Plot creation:
Sat May 30 18:52:59 EDT 2015