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
221.6026 12.2659 0.0153 12.3481 57.6330 0.0982011 12.534 TRIG_00638808
Foreground time interval of the image:
0.008 0.240 (delta_t = 0.232 [sec])
Background time interval of the image:
-719.875 -701.655 (delta_t = 18.221 [sec])
-239.176 0.008 (delta_t = 239.184 [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 0.256000
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 0.256000
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 0.256000
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 0.008 sec. to 0.240 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.771052 ( -0.23805 0.229765 )
Norm@50keV : 2.39279E-02 ( -0.00345842 0.00343979 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.22 using 59 PHA bins.
# Reduced chi-squared = 1.372 for 57 degrees of freedom
# Null hypothesis probability = 3.254926e-02
Photon flux (15-150 keV) in 0.232 sec: 2.75338 ( -0.391357 0.391676 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.5675e-08 ( -1.02844e-08 1.03742e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 0.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.443047 ( -1.40415 1.04979 )
Epeak [keV] : 120.501 ( -35.22 319.493 )
Norm@50keV : 7.83705E-02 ( -0.0495546 0.195899 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.20 using 59 PHA bins.
# Reduced chi-squared = 1.325 for 56 degrees of freedom
# Null hypothesis probability = 5.217618e-02
Photon flux (15-150 keV) in 0.232 sec: 2.66402 ( -0.40308 0.40128 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.30857e-08 ( -1.09813e-08 1.09657e-08 ) ergs/cm2
Band function
Time interval is from 0.008 sec. to 0.240 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.942174 ( 0.941938 0.941938 )
beta : -0.771258 ( -0.229865 0.237564 )
Epeak [keV] : 13.0940 ( -13.0947 -13.0947 )
Norm@50keV : 3.55841E-02 ( -0.0150744 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.22 using 59 PHA bins.
# Reduced chi-squared = 1.422 for 55 degrees of freedom
# Null hypothesis probability = 2.148860e-02
Photon flux (15-150 keV) in 0.232 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] : 24.7209 (-3.98974 5.17876)
R^2/D10^2 : 7.59759E-02 (-0.0324968 0.0523632)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.29 using 59 PHA bins.
# Reduced chi-squared = 1.321 for 57 degrees of freedom
# Null hypothesis probability = 5.269970e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.882e-09 5.426e-10
25- 50 1.062e-08 2.551e-09
50-150 4.819e-08 1.283e-08
15-150 6.069e-08 1.452e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 10.0182 (-1.56293 1.5629)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 104.48 using 59 PHA bins.
# Reduced chi-squared = 1.8329 for 57 degrees of freedom
# Null hypothesis probability = 1.280494e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.746e-09 3.287e-09
25- 50 1.105e-08 6.395e-09
50-150 2.424e-08 1.361e-08
15-150 4.104e-08 2.356e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.15727 (-6.15766 -6.15766)
R1^2/D10^2 : 1.12544 (-1.12522 11.8674)
kT2 [keV] : 27.4483 (-5.66922 -27.4485)
R2^2/D10^2 : 5.29103E-02 (-0.0529085 0.05539)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.65 using 59 PHA bins.
# Reduced chi-squared = 1.339 for 55 degrees of freedom
# Null hypothesis probability = 4.728892e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.889e-09 1.610e-09
25- 50 1.049e-08 5.275e-09
50-150 4.977e-08 2.412e-08
15-150 6.315e-08 3.177e-08
Peak spectrum fit
Power-law model
Time interval is from -0.374 sec. to 0.626 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.857667 ( -0.295485 0.277593 )
Norm@50keV : 7.50190E-03 ( -0.00125115 0.00123674 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.66 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.145131e-01
Photon flux (15-150 keV) in 1 sec: 0.861081 ( -0.141605 0.142179 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.56113e-08 ( -1.47896e-08 1.49395e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.374 sec. to 0.626 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.08719E-02 ( -1.79621 0.989659 )
Epeak [keV] : 134.953 ( )
Norm@50keV : 1.78272E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.33 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 56 degrees of freedom
# Null hypothesis probability = 4.256099e-01
Photon flux (15-150 keV) in 1 sec: 0.829010 ( -0.152179 0.150367 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.17093e-08 ( -1.66304e-08 1.62842e-08 ) ergs/cm2
Band function
Time interval is from -0.374 sec. to 0.626 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.954752 ( -0.333743 0.332202 )
Epeak [keV] : 32.8792 ( -31.6533 19.9444 )
Norm@50keV : 96.0741 ( -15.2826 1.32487e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.24 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 55 degrees of freedom
# Null hypothesis probability = 3.570941e-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] : 23.1256 (-4.32071 6.12598)
R^2/D10^2 : 2.74950E-02 (-0.0140146 0.0250456)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.06 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 57 degrees of freedom
# Null hypothesis probability = 4.000750e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.658e-09 1.034e-09
25- 50 1.446e-08 4.138e-09
50-150 5.777e-08 1.808e-08
15-150 7.489e-08 1.983e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.41114 (-0.589006 0.588973)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.25 using 59 PHA bins.
# Reduced chi-squared = 1.303 for 57 degrees of freedom
# Null hypothesis probability = 6.212776e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.498e-09 4.894e-09
25- 50 1.635e-08 9.245e-09
50-150 3.585e-08 2.093e-08
15-150 6.070e-08 3.478e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.61 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.47 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.45 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.28 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 55 degrees of freedom
# Reduced chi-squared = 1.045 for 55 degrees of freedom
# Reduced chi-squared = 1.044 for 55 degrees of freedom
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Null hypothesis probability = 3.787177e-01
# Null hypothesis probability = 3.838196e-01
# Null hypothesis probability = 3.846925e-01
# Null hypothesis probability = 3.905953e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.441e-09 2.591e-09
25- 50 1.414e-08 6.480e-09
50-150 6.067e-08 3.535e-08
15-150 7.925e-08 4.325e-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: 0.771052 ( -0.23805 0.229765 )
Norm@50keV : 2.39279E-02 ( -0.00345842 0.00343979 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.22 using 59 PHA bins.
# Reduced chi-squared = 1.372 for 57 degrees of freedom
# Null hypothesis probability = 3.254926e-02
Photon flux (15-150 keV) in 0.232 sec: 2.75338 ( -0.391357 0.391676 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.5675e-08 ( -1.02844e-08 1.03742e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.443047 ( -1.40415 1.04979 )
Epeak [keV] : 120.501 ( -35.22 319.493 )
Norm@50keV : 7.83705E-02 ( -0.0495546 0.195899 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.20 using 59 PHA bins.
# Reduced chi-squared = 1.325 for 56 degrees of freedom
# Null hypothesis probability = 5.217618e-02
Photon flux (15-150 keV) in 0.232 sec: 2.66402 ( -0.40308 0.40128 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.30857e-08 ( -1.09813e-08 1.09657e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.942174 ( 0.941938 0.941938 )
beta : -0.771258 ( -0.229865 0.237564 )
Epeak [keV] : 13.0940 ( -13.0947 -13.0947 )
Norm@50keV : 3.55841E-02 ( -0.0150744 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.22 using 59 PHA bins.
# Reduced chi-squared = 1.422 for 55 degrees of freedom
# Null hypothesis probability = 2.148860e-02
Photon flux (15-150 keV) in 0.232 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) = 1.04e-08
S(50-100 keV) = 2.43e-08
T90 vs. Hardness ratio plot
T90 = 0.215999901294708 sec.
Hardness ratio (energy fluence ratio) = 2.33654
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 2.70235
Count Ratio (50-100 keV) / (15-25 keV) = 3.6709
Mask shadow pattern
IMX = 1.171942592691804E-01, IMY = -1.849037376510331E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
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:
-719.875400 -701.654600
-239.176000 0.008000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9889 -15.6436 0.7 48.1 42.4 21.2257 17.6 0.6 Sco X-1
254.4563 35.3531 2.1 34.5 -38.3 1.5503 5.6 0.6 Her X-1
268.3655 -1.3632 20.6 56.0 9.2 0.8411 0.6 5.4 SW J1753.5-0127
212.6308 -15.9443 2.3 39.9 86.4 4.5923 4.9 ------ UNKNOWN
261.5879 6.4322 3.6 46.3 4.6 1.3338 3.2 ------ UNKNOWN
182.2648 62.7978 3.5 45.3 -121.3 3.6050 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.008000 0.240000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0795 -15.7452 7.8 48.2 42.4 0.0552 1.5 8.5 Sco X-1
254.5050 35.3192 6.4 34.5 -38.3 0.0169 1.8 2.7 Her X-1
268.3034 -1.5242 7.9 56.0 9.4 -0.0622 -1.5 5.8 SW J1753.5-0127
221.6026 12.2660 0.9 12.3 57.6 0.0982 12.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
53.324600 962.894000
1175.824000 1175.824610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9825 -15.6355 0.2 36.3 25.8 85.4166 59.5 0.3 Sco X-1
254.5056 35.2717 3.9 37.6 -67.4 6.8742 3.0 4.9 Her X-1
263.0989 -24.6605 5.2 54.8 18.5 10.5397 2.2 7.1 GX 1+4
268.3883 -1.4587 8.4 48.4 -10.8 2.4435 1.4 1.3 SW J1753.5-0127
176.2982 -2.2629 3.0 47.3 141.2 16.0521 3.9 ------ UNKNOWN
211.6359 3.1281 3.9 13.5 113.9 2.6546 2.9 ------ UNKNOWN
266.3160 -13.9879 2.7 51.5 5.3 10.0851 4.2 ------ UNKNOWN
247.4510 -3.7503 3.5 30.3 6.4 3.5632 3.2 ------ UNKNOWN
182.9670 44.2612 3.6 46.0 -152.5 5.5477 3.2 ------ UNKNOWN
180.5611 54.7816 3.1 53.2 -142.2 19.4796 3.7 ------ UNKNOWN
218.8524 56.1614 4.5 43.9 -116.2 10.5316 2.6 ------ UNKNOWN
Plot creation:
Thu May 28 12:59:12 EDT 2015