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
246.1799 -27.5253 0.0152 33.3010 45.6079 0.6278714 12.572 TRIG_00147478
Foreground time interval of the image:
-0.024 8.701 (delta_t = 8.725 [sec])
Background time interval of the image:
-186.899 -0.024 (delta_t = 186.875 [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 107.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93423 ( -0.204333 0.21244 )
Norm@50keV : 1.01934E-03 ( -0.000126117 0.000122932 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.20 using 59 PHA bins.
# Reduced chi-squared = 0.9859 for 57 degrees of freedom
# Null hypothesis probability = 5.051084e-01
Photon flux (15-150 keV) in 107.2 sec: 0.148458 ( -0.0155345 0.0155838 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00518e-06 ( -1.1885e-07 1.21038e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 107.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50788 ( )
Epeak [keV] : 179.279 ( )
Norm@50keV : 5.49201E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.21 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 56 degrees of freedom
# Null hypothesis probability = 4.671686e-01
Photon flux (15-150 keV) in 107.2 sec: 0.148397 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00119e-06 ( -1.21116e-07 1.22767e-07 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 107.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.67185 ( 1.67188 1.67188 )
beta : -1.93420 ( 1.9342 0.204247 )
Epeak [keV] : 14.6558 ( -14.6375 -14.6375 )
Norm@50keV : 1.93902E-03 ( -0.0010309 0.0129655 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.20 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 55 degrees of freedom
# Null hypothesis probability = 4.297502e-01
Photon flux (15-150 keV) in 107.2 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] : 10.3049 (-1.31769 1.56056)
R^2/D10^2 : 5.84959E-02 (-0.0244341 0.0410183)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.62 using 59 PHA bins.
# Reduced chi-squared = 1.467 for 57 degrees of freedom
# Null hypothesis probability = 1.237187e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.369e-07 2.863e-08
25- 50 3.550e-07 4.711e-08
50-150 2.020e-07 5.435e-08
15-150 6.939e-07 9.686e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 80.3636 (-25.124 48.1937)
Norm : 0.681616 (-0.103511 0.14278)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.16 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 57 degrees of freedom
# Null hypothesis probability = 3.967885e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.897e-07 2.878e-08
25- 50 3.126e-07 3.575e-08
50-150 4.425e-07 1.930e-07
15-150 9.448e-07 1.825e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.93543 (-1.90483 1.83442)
R1^2/D10^2 : 0.220142 (-0.122663 0.275937)
kT2 [keV] : 33.3695 (-15.1467 165.33)
R2^2/D10^2 : 5.91390E-04 (-0.000517601 0.00409757)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.91 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 55 degrees of freedom
# Null hypothesis probability = 3.685151e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.909e-07 7.112e-08
25- 50 3.092e-07 9.878e-08
50-150 5.357e-07 2.849e-07
15-150 1.036e-06 3.889e-07
Peak spectrum fit
Power-law model
Time interval is from -0.024 sec. to 0.976 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65765 ( -0.15835 0.161734 )
Norm@50keV : 2.56355E-02 ( -0.00231729 0.00229481 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.99 using 59 PHA bins.
# Reduced chi-squared = 0.9822 for 57 degrees of freedom
# Null hypothesis probability = 5.130992e-01
Photon flux (15-150 keV) in 1 sec: 3.35585 ( -0.294745 0.295747 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3824e-07 ( -2.27954e-08 2.29997e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61724 ( -0.607417 0.850922 )
Epeak [keV] : 478.826 ( -478.314 -478.314 )
Norm@50keV : 2.68595E-02 ( -0.00871504 0.0261677 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.97 using 59 PHA bins.
# Reduced chi-squared = 0.9995 for 56 degrees of freedom
# Null hypothesis probability = 4.759167e-01
Photon flux (15-150 keV) in 1 sec: 3.34583 ( -0.3103 0.30333 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37392e-07 ( -2.4664e-08 2.3727e-08 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 0.976 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.42468 ( 1.42488 1.42488 )
beta : -1.65764 ( 1.65764 0.158327 )
Epeak [keV] : 28.8109 ( -28.7027 -28.7027 )
Norm@50keV : 4.54208E-02 ( -0.0219877 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.99 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 55 degrees of freedom
# Null hypothesis probability = 4.375852e-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] : 14.1851 (-1.62154 1.86075)
R^2/D10^2 : 0.433916 (-0.154221 0.237455)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.59 using 59 PHA bins.
# Reduced chi-squared = 1.677 for 57 degrees of freedom
# Null hypothesis probability = 1.036682e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.842e-08 3.160e-09
25- 50 6.940e-08 7.870e-09
50-150 9.256e-08 1.707e-08
15-150 1.804e-07 2.070e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 160.316 (-54.9357 -161.569)
Norm : 13.6074 (-1.30541 1.54762)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.98 using 59 PHA bins.
# Reduced chi-squared = 0.9996 for 57 degrees of freedom
# Null hypothesis probability = 4.759336e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.474e-08 4.830e-09
25- 50 6.500e-08 2.262e-08
50-150 1.318e-07 7.111e-08
15-150 2.315e-07 8.944e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.28287 (-1.49333 2.05461)
R1^2/D10^2 : 10.6373 (-7.53637 25.906)
kT2 [keV] : 22.4751 (-4.29172 7.55603)
R2^2/D10^2 : 7.15175E-02 (-0.0468079 0.0568505)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.22 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 55 degrees of freedom
# Null hypothesis probability = 3.928426e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.870e-08 1.625e-08
25- 50 5.938e-08 1.990e-08
50-150 1.351e-07 4.183e-08
15-150 2.331e-07 6.205e-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: 1.86747 ( -0.251182 0.262491 )
Norm@50keV : 4.36091E-03 ( -0.000666751 0.000645565 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.65 using 59 PHA bins.
# Reduced chi-squared = 0.8183 for 57 degrees of freedom
# Null hypothesis probability = 8.345193e-01
Photon flux (15-150 keV) in 8.725 sec: 0.617372 ( -0.0812791 0.0815609 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.49793e-07 ( -5.22465e-08 5.32108e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.49774 ( )
Epeak [keV] : 175.034 ( )
Norm@50keV : 2.14039E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.76 using 59 PHA bins.
# Reduced chi-squared = 0.8172 for 56 degrees of freedom
# Null hypothesis probability = 8.338339e-01
Photon flux (15-150 keV) in 8.725 sec: 0.618913 ( -0.083274 0.080176 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.49203e-07 ( -5.16633e-08 5.37888e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51110 ( 1.5111 1.5111 )
beta : -1.86746 ( 1.86746 0.251157 )
Epeak [keV] : 15.1314 ( -15.1308 -15.1308 )
Norm@50keV : 1.06725E-02 ( -0.0106726 3447.4 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.65 using 59 PHA bins.
# Reduced chi-squared = 0.8481 for 55 degrees of freedom
# Null hypothesis probability = 7.812631e-01
Photon flux (15-150 keV) in 8.725 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) = 2.97e-07
S(50-100 keV) = 3.10e-07
T90 vs. Hardness ratio plot
T90 = 98.6840000152588 sec.
Hardness ratio (energy fluence ratio) = 1.04377
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.99679
Count Ratio (50-100 keV) / (15-25 keV) = 0.501146
Mask shadow pattern
IMX = 4.595461485119394E-01, IMY = -4.694024223903498E-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:
-186.899400 -0.024000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4474 -60.4695 6.1 26.2 -142.0 -0.3391 -1.9 10.0 Cen X-3
186.7901 -62.8613 4.6 19.3 -153.0 0.4330 2.5 6.6 GX 301-2
244.9760 -15.6399 0.3 42.7 33.5 18.4538 35.5 0.2 Sco X-1
256.2256 -37.9311 0.0 32.0 70.4 -0.6045 -1.6 12.5 4U 1700-377
256.4131 -36.4783 4.9 33.0 68.5 0.9660 2.4 3.5 GX 349+2
264.5032 -44.4410 46.5 33.8 86.7 -0.1112 -0.2 10.3 4U 1735-44
263.0285 -33.8460 4.4 38.9 70.9 1.9309 2.6 2.1 GX 354-0
266.0883 -34.9208 2.5 40.1 74.7 4.0195 4.7 ------ UNKNOWN
93.5979 -60.2851 4.1 59.4 -163.1 3.8316 2.8 ------ UNKNOWN
151.9694 -40.5317 2.7 43.5 -114.6 3.2449 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.024000 8.700600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2551 -60.8231 5.1 26.3 -142.8 0.0701 2.3 12.1 Cen X-3
186.5310 -62.8057 11.7 19.4 -152.7 -0.0265 -1.0 4.0 GX 301-2
245.0739 -15.6749 3.3 42.7 33.7 0.2778 3.5 5.8 Sco X-1
255.8512 -37.9829 5.3 31.7 70.2 0.1227 2.2 10.5 4U 1700-377
256.3124 -36.5795 0.0 32.9 68.5 0.0934 1.6 11.1 GX 349+2
264.6701 -44.3724 7.1 33.9 86.7 0.1085 1.6 5.6 4U 1735-44
263.1571 -33.7865 9.6 39.0 70.9 -0.1306 -1.2 8.9 GX 354-0
246.1799 -27.5253 0.9 33.3 45.6 0.6280 12.6 ------ UNKNOWN
200.0554 -27.1795 2.1 25.8 -43.2 0.1617 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
62.500630 303.065000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6857 -62.7305 3.8 51.9 -154.7 2.1969 3.0 2.5 GX 301-2
244.9809 -15.6433 0.1 11.9 -10.7 23.5581 96.1 0.2 Sco X-1
255.8007 -37.7054 11.3 13.0 139.3 0.2618 1.0 12.1 4U 1700-377
256.5420 -36.4436 3.3 12.5 133.4 0.9058 3.5 5.3 GX 349+2
262.8361 -24.6064 0.0 15.2 77.9 -0.3120 -1.2 12.6 GX 1+4
264.6613 -44.4744 6.5 22.5 139.0 0.5109 1.8 3.8 4U 1735-44
268.3720 -1.4676 1.8 33.6 38.1 2.6984 6.5 0.9 SW J1753.5-0127
270.2497 -24.9876 2.7 21.7 83.9 1.2591 4.2 5.8 GX 5-1
270.2970 -25.7805 2.3 21.5 86.1 1.4936 5.0 2.3 GRS 1758-258
274.1682 -14.1027 5.8 29.2 63.6 0.8209 2.0 10.3 GX 17+2
275.8812 -30.5117 8.2 26.0 98.9 0.5435 1.4 9.0 H1820-303
285.1172 -24.8848 20.2 34.8 89.9 0.3611 0.6 4.9 HT1900.1-2455
262.9803 -33.8293 169.3 15.7 113.0 0.0187 0.1 0.5 GX 354-0
250.5588 29.3055 3.8 57.0 -0.4 4.6772 3.0 ------ UNKNOWN
Plot creation:
Sun May 31 16:26:40 EDT 2015