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
256.3586 11.4570 0.0165 29.7056 133.9319 0.7266462 11.636 TRIG_00419797
Foreground time interval of the image:
-1.112 8.304 (delta_t = 9.416 [sec])
Background time interval of the image:
-17.459 -1.112 (delta_t = 16.347 [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)
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 -1.112 sec. to 8.304 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19543 ( -0.25147 0.271075 )
Norm@50keV : 3.91453E-03 ( -0.000670416 0.000644936 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.28 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 57 degrees of freedom
# Null hypothesis probability = 2.110903e-01
Photon flux (15-150 keV) in 9.416 sec: 0.646509 ( -0.0768031 0.0769063 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.46331e-07 ( -4.93406e-08 5.07182e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.112 sec. to 8.304 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91581 ( )
Epeak [keV] : 16.1696 ( )
Norm@50keV : 5.34933E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.55 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 56 degrees of freedom
# Null hypothesis probability = 1.580822e-01
Photon flux (15-150 keV) in 9.416 sec: 0.647327 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.45611e-07 ( -4.86704e-08 4.94274e-08 ) ergs/cm2
Band function
Time interval is from -1.112 sec. to 8.304 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.61022 ( 1.61227 1.61227 )
beta : -2.19334 ( 2.19452 0.250699 )
Epeak [keV] : 10.7342 ( -10.1381 -10.1381 )
Norm@50keV : 1.36076E-02 ( -0.0139738 0.347042 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.28 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 55 degrees of freedom
# Null hypothesis probability = 1.615722e-01
Photon flux (15-150 keV) in 9.416 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] : 8.02743 (-1.29376 1.61046)
R^2/D10^2 : 0.652169 (-0.337887 0.69496)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 92.89 using 59 PHA bins.
# Reduced chi-squared = 1.630 for 57 degrees of freedom
# Null hypothesis probability = 1.878478e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.174e-08 1.645e-08
25- 50 1.263e-07 2.307e-08
50-150 3.354e-08 1.337e-08
15-150 2.316e-07 4.595e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 51.8239 (-16.7832 30.7307)
Norm : 3.49742 (-0.757591 1.10362)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.64 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 57 degrees of freedom
# Null hypothesis probability = 1.058554e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.117e-08 1.402e-08
25- 50 1.180e-07 1.638e-08
50-150 1.185e-07 4.068e-08
15-150 3.177e-07 5.019e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.97598 (-1.13642 1.29206)
R1^2/D10^2 : 3.92880 (-2.43065 8.60287)
kT2 [keV] : 23.5629 (-7.56163 15.7973)
R2^2/D10^2 : 7.90565E-03 (-0.00638561 0.0220027)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.51 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 55 degrees of freedom
# Null hypothesis probability = 1.783712e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.565e-08 3.294e-08
25- 50 9.765e-08 3.842e-08
50-150 1.709e-07 1.026e-07
15-150 3.642e-07 1.428e-07
Peak spectrum fit
Power-law model
Time interval is from 0.472 sec. to 1.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.66135 ( -0.546742 0.711114 )
Norm@50keV : 4.78988E-03 ( -0.00218985 0.00215965 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.06 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 57 degrees of freedom
# Null hypothesis probability = 4.361510e-01
Photon flux (15-150 keV) in 1 sec: 1.04217 ( -0.234906 0.234941 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.02867e-08 ( -1.44955e-08 1.57692e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.472 sec. to 1.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98401 ( -1.10067 0.0155924 )
Epeak [keV] : 0.972607 ( -0.624611 30.9766 )
Norm@50keV : 1.18660E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.04 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 56 degrees of freedom
# Null hypothesis probability = 3.650134e-01
Photon flux (15-150 keV) in 1 sec: 1.04253 ( -0.237007 0.23577 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.96584e-08 ( -1.40901e-08 1.64227e-08 ) ergs/cm2
Band function
Time interval is from 0.472 sec. to 1.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.26981 ( 6.26981 6.26981 )
beta : -2.66137 ( -0.711111 0.547474 )
Epeak [keV] : 22.9947 ( -22.9947 -22.9947 )
Norm@50keV : 0.651003 ( -0.29763 0.293528 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.06 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 55 degrees of freedom
# Null hypothesis probability = 3.633491e-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] : 5.99966 (-1.79181 2.39047)
R^2/D10^2 : 3.53217 (-3.49858 14.4829)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.22 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 57 degrees of freedom
# Null hypothesis probability = 2.126085e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.689e-08 9.276e-09
25- 50 1.684e-08 1.010e-08
50-150 1.542e-09 1.223e-09
15-150 3.528e-08 2.057e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.5013 (-13.5916 32.6699)
Norm : 8.78369 (-4.02309 10.8974)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.26 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 57 degrees of freedom
# Null hypothesis probability = 3.587700e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.705e-08 5.292e-09
25- 50 1.854e-08 8.448e-09
50-150 9.030e-09 6.425e-09
15-150 4.462e-08 1.899e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.59733 (-2.32322 2.23663)
R1^2/D10^2 : 32.0954 (-28.4209 56611.6)
kT2 [keV] : 16.4569 (-9.41652 26.8946)
R2^2/D10^2 : 4.04897E-02 (-0.0387446 1.4758)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.03 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 55 degrees of freedom
# Null hypothesis probability = 3.641338e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.929e-08 1.055e-08
25- 50 1.420e-08 7.350e-09
50-150 1.859e-08 1.158e-08
15-150 5.209e-08 2.774e-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: 2.19543 ( -0.25147 0.271075 )
Norm@50keV : 3.91453E-03 ( -0.000670416 0.000644936 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.28 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 57 degrees of freedom
# Null hypothesis probability = 2.110903e-01
Photon flux (15-150 keV) in 9.416 sec: 0.646509 ( -0.0768031 0.0769063 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.46331e-07 ( -4.93406e-08 5.07182e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91581 ( )
Epeak [keV] : 16.1696 ( )
Norm@50keV : 5.34933E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.55 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 56 degrees of freedom
# Null hypothesis probability = 1.580822e-01
Photon flux (15-150 keV) in 9.416 sec: 0.647327 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.45611e-07 ( -4.86704e-08 4.94274e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.61022 ( 1.61227 1.61227 )
beta : -2.19334 ( 2.19452 0.250699 )
Epeak [keV] : 10.7342 ( -10.1381 -10.1381 )
Norm@50keV : 1.36076E-02 ( -0.0139738 0.205994 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.28 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 55 degrees of freedom
# Null hypothesis probability = 1.615722e-01
Photon flux (15-150 keV) in 9.416 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) = 1.10e-07
S(50-100 keV) = 9.57e-08
T90 vs. Hardness ratio plot
T90 = 7.92799997329712 sec.
Hardness ratio (energy fluence ratio) = 0.87
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.744473
Count Ratio (50-100 keV) / (15-25 keV) = 0.446216
Mask shadow pattern
IMX = -3.958289840619809E-01, IMY = -4.108687631825915E-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:
-17.459400 -1.112000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9849 -15.6577 0.9 33.5 76.5 1.2104 13.1 1.1 Sco X-1
254.3200 35.2362 16.1 49.3 155.9 0.1080 0.7 9.3 Her X-1
255.8166 -37.9569 9.3 35.8 33.3 0.0953 1.2 10.5 4U 1700-377
256.5999 -36.4397 64.8 34.3 34.2 0.0130 0.2 8.0 GX 349+2
262.9295 -24.7011 4.9 21.9 42.7 0.1177 2.3 5.1 GX 1+4
264.5722 -44.4924 19.1 37.9 18.2 0.0413 0.6 7.7 4U 1735-44
268.5154 -1.3001 0.0 12.3 127.6 0.0443 1.1 12.7 SW J1753.5-0127
270.4428 -25.0653 9.0 18.2 25.9 -0.0599 -1.3 8.7 GX 5-1
270.3965 -25.8940 12.9 19.0 24.8 0.0418 0.9 10.4 GRS 1758-258
274.1569 -13.9176 2.2 6.8 39.7 0.2190 5.2 11.3 GX 17+2
275.9880 -30.4728 5.0 22.1 7.7 0.1053 2.3 7.1 H1820-303
285.1457 -25.0621 4.4 17.7 -18.3 0.1083 2.6 10.4 HT1900.1-2455
288.8671 11.0037 2.1 22.1 -149.9 0.2430 5.7 5.3 GRS 1915+105
299.5940 35.2004 1.8 48.1 -154.7 0.5782 6.3 0.2 Cyg X-1
308.1453 40.9164 5.6 56.5 -151.3 0.4495 2.1 2.7 Cyg X-3
263.1047 -33.9931 7.1 29.1 28.8 0.0892 1.6 11.1 GX 354-0
263.7635 20.9928 2.5 32.9 156.1 0.2597 4.6 ------ UNKNOWN
278.3337 16.9159 2.3 25.4 -178.3 0.2371 5.1 ------ UNKNOWN
315.7735 23.1387 2.2 48.3 -129.7 1.0115 5.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.112000 8.304000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0418 -15.5712 13.7 33.4 76.6 -0.0723 -0.8 5.5 Sco X-1
254.4096 35.2770 41.9 49.3 156.0 -0.0403 -0.3 4.6 Her X-1
256.1096 -37.9324 10.0 35.7 33.0 0.0797 1.2 7.9 4U 1700-377
256.4148 -36.4091 265.6 34.3 34.4 0.0030 0.0 1.3 GX 349+2
262.9823 -24.6457 6.7 21.9 42.7 -0.0785 -1.7 6.2 GX 1+4
264.7741 -44.6019 40.2 38.0 17.9 0.0188 0.3 9.2 4U 1735-44
268.3873 -1.4360 307.8 12.3 126.7 -0.0016 -0.0 1.5 SW J1753.5-0127
270.4446 -25.1742 13.6 18.3 25.7 0.0371 0.8 10.4 GX 5-1
270.4637 -25.8655 15.8 18.9 24.7 -0.0317 -0.7 11.4 GRS 1758-258
274.1566 -13.9064 3.0 6.8 39.7 -0.1537 -3.8 11.7 GX 17+2
275.7618 -30.3182 18.3 21.9 8.3 -0.0273 -0.6 8.9 H1820-303
285.1993 -24.9974 5.0 17.7 -18.5 -0.0945 -2.3 10.0 HT1900.1-2455
288.6921 10.8675 14.6 21.9 -150.1 0.0325 0.8 7.8 GRS 1915+105
299.4683 35.0977 4.4 47.9 -154.7 0.2231 2.7 8.6 Cyg X-1
308.0950 40.8934 5.8 56.4 -151.3 0.4158 2.0 3.6 Cyg X-3
263.0219 -33.7538 11.8 29.0 29.2 0.0508 1.0 5.1 GX 354-0
256.3586 11.4570 1.0 29.7 133.9 0.7267 11.6 ------ UNKNOWN
295.9000 -1.4113 2.0 18.8 -109.3 0.2589 5.8 ------ UNKNOWN
305.1138 -39.3903 2.5 39.0 -31.4 0.2858 4.6 ------ UNKNOWN
320.9137 -39.4412 2.5 48.9 -41.8 0.5852 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
67.740590 962.295100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9822 -15.6365 0.2 29.4 45.8 53.1814 54.1 0.3 Sco X-1
254.3975 35.2314 9.1 23.8 -161.2 0.9401 1.3 7.3 Her X-1
256.0028 -37.8244 7.9 49.3 23.4 3.3957 1.5 1.4 4U 1700-377
256.5794 -36.4016 5.4 47.9 22.8 -3.9905 -2.1 7.1 GX 349+2
262.8243 -24.6837 56.2 36.7 13.2 0.1965 0.2 10.7 GX 1+4
268.3195 -1.4074 2.3 17.5 -20.4 3.2424 4.9 4.0 SW J1753.5-0127
270.3145 -25.0801 3.9 39.0 2.7 3.1599 2.9 1.6 GX 5-1
270.3199 -25.6716 10.7 39.5 3.0 1.1327 1.1 4.4 GRS 1758-258
274.0051 -14.0201 1.4 30.9 -11.9 5.9976 8.2 1.0 GX 17+2
275.8336 -30.4062 6.0 45.8 -0.6 2.5059 1.9 5.3 H1820-303
285.1197 -24.9843 4.8 45.9 -14.3 2.9808 2.4 5.9 HT1900.1-2455
288.8358 10.9077 1.7 31.8 -69.3 7.2092 6.6 3.2 GRS 1915+105
262.8090 -33.7479 5.9 45.6 15.5 -2.7855 -1.9 10.4 GX 354-0
257.9064 -23.6681 2.0 35.2 20.6 5.3260 5.7 ------ UNKNOWN
239.7866 28.2441 3.8 22.9 162.5 2.1425 3.0 ------ UNKNOWN
271.1211 -30.4869 2.5 44.3 4.7 4.9844 4.7 ------ UNKNOWN
216.7781 56.1585 6.7 54.2 176.9 5.2393 1.7 ------ UNKNOWN
285.8643 52.1060 3.8 47.1 -132.7 7.1055 3.0 ------ UNKNOWN
302.8758 -9.5251 3.7 50.7 -44.5 13.1273 3.1 ------ UNKNOWN
288.7057 53.8517 2.9 49.5 -132.6 15.6564 4.0 ------ UNKNOWN
Plot creation:
Sun May 31 01:51:46 EDT 2015