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
278.4863 -12.9755 0.0063 13.0783 56.2112 1.4986007 30.282 TRIG_00649157
Foreground time interval of the image:
-4.192 13.381 (delta_t = 17.573 [sec])
Background time interval of the image:
-239.920 -4.192 (delta_t = 235.728 [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 -4.192 sec. to 47.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53412 ( -0.0946912 0.0950769 )
Norm@50keV : 3.04669E-03 ( -0.000161248 0.000160896 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.78 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 57 degrees of freedom
# Null hypothesis probability = 2.236970e-01
Photon flux (15-150 keV) in 51.34 sec: 0.383944 ( -0.0206928 0.0207365 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47595e-06 ( -8.46935e-08 8.51813e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.192 sec. to 47.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00573 ( -0.42915 0.389639 )
Epeak [keV] : 94.4785 ( -22.2256 114.333 )
Norm@50keV : 5.57723E-03 ( -0.00196649 0.00342964 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.26 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 56 degrees of freedom
# Null hypothesis probability = 3.576634e-01
Photon flux (15-150 keV) in 51.34 sec: 0.371870 ( -0.022416 0.022429 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41125e-06 ( -9.72739e-08 9.74639e-08 ) ergs/cm2
Band function
Time interval is from -4.192 sec. to 47.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.960227 ( -0.432334 2.27034 )
beta : -2.06007 ( 2.05539 0.485414 )
Epeak [keV] : 89.0595 ( -53.4487 113.476 )
Norm@50keV : 5.92544E-03 ( -0.00227115 0.113619 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.21 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 55 degrees of freedom
# Null hypothesis probability = 3.244682e-01
Photon flux (15-150 keV) in 51.34 sec: 0.371456 ( 6.62854 -0.022423 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41045e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.9124 ( )
R^2/D10^2 : 4.33258E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 117.46 using 59 PHA bins.
# Reduced chi-squared = 2.0607 for 57 degrees of freedom
# Null hypothesis probability = 4.390270e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.037e-07 1.076e-08
25- 50 4.096e-07 2.767e-08
50-150 6.183e-07 6.443e-08
15-150 1.132e-06 7.521e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-44.0459 -199.363)
Norm : 1.56348 (-0.0805502 0.0806814)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.43 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 57 degrees of freedom
# Null hypothesis probability = 3.530478e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.999e-07 1.201e-08
25- 50 3.845e-07 2.321e-08
50-150 8.433e-07 5.057e-08
15-150 1.428e-06 1.681e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.04787 (-1.50215 1.73589)
R1^2/D10^2 : 0.350469 (-0.171478 0.442956)
kT2 [keV] : 23.5788 (-3.74461 6.74647)
R2^2/D10^2 : 6.77613E-03 (-0.00417059 0.00661272)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.58 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 55 degrees of freedom
# Null hypothesis probability = 2.815861e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.792e-07 4.749e-08
25- 50 3.911e-07 7.057e-08
50-150 8.241e-07 2.286e-07
15-150 1.394e-06 3.658e-07
Peak spectrum fit
Power-law model
Time interval is from 9.692 sec. to 10.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79646 ( -0.307401 0.328315 )
Norm@50keV : 5.98850E-03 ( -0.00122654 0.00118734 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.78 using 59 PHA bins.
# Reduced chi-squared = 0.8382 for 57 degrees of freedom
# Null hypothesis probability = 8.028877e-01
Photon flux (15-150 keV) in 1 sec: 0.824079 ( -0.143096 0.143169 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.51375e-08 ( -1.12319e-08 1.15683e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.692 sec. to 10.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33334 ( -1.62038 0.880124 )
Epeak [keV] : 63.5046 ( )
Norm@50keV : 1.08578E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.35 using 59 PHA bins.
# Reduced chi-squared = 0.8456 for 56 degrees of freedom
# Null hypothesis probability = 7.880564e-01
Photon flux (15-150 keV) in 1 sec: 0.809275 ( -0.148874 0.148018 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.26878e-08 ( -1.27617e-08 1.30125e-08 ) ergs/cm2
Band function
Time interval is from 9.692 sec. to 10.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33431 ( 1.50641 0.458727 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 63.5474 ( -33.8457 -63.5474 )
Norm@50keV : 1.08423E-02 ( -0.00595646 0.0169935 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.35 using 59 PHA bins.
# Reduced chi-squared = 0.8609 for 55 degrees of freedom
# Null hypothesis probability = 7.585910e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.28924e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.0911 (-2.1641 2.80791)
R^2/D10^2 : 0.264064 (-0.149573 0.328698)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.58 using 59 PHA bins.
# Reduced chi-squared = 0.9401 for 57 degrees of freedom
# Null hypothesis probability = 6.039838e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.798e-09 2.222e-09
25- 50 1.943e-08 5.405e-09
50-150 1.358e-08 6.407e-09
15-150 3.981e-08 1.206e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 98.1234 (-45.0535 -98.1234)
Norm : 3.66399 (-0.738534 1.12152)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.34 using 59 PHA bins.
# Reduced chi-squared = 0.8306 for 57 degrees of freedom
# Null hypothesis probability = 8.153593e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.576e-09 2.517e-09
25- 50 1.649e-08 6.247e-09
50-150 2.644e-08 1.739e-08
15-150 5.251e-08 2.194e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.13207 (-4.56496 3.76163)
R1^2/D10^2 : 0.981594 (-0.707716 55.2315)
kT2 [keV] : 24.9310 (-20.9554 -25.2683)
R2^2/D10^2 : 8.79528E-03 (-0.00830362 0.177776)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.67 using 59 PHA bins.
# Reduced chi-squared = 0.8667 for 55 degrees of freedom
# Null hypothesis probability = 7.480599e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.126e-09 5.285e-09
25- 50 1.699e-08 9.215e-09
50-150 2.690e-08 1.670e-08
15-150 5.302e-08 2.743e-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: 1.33860 ( -0.0980018 0.0976588 )
Norm@50keV : 5.20002E-03 ( -0.000282359 0.000282328 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.07 using 59 PHA bins.
# Reduced chi-squared = 0.9662 for 57 degrees of freedom
# Null hypothesis probability = 5.477907e-01
Photon flux (15-150 keV) in 17.57 sec: 0.625003 ( -0.0355516 0.0356351 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.9465e-07 ( -5.31832e-08 5.3407e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.798568 ( -0.454418 0.409533 )
Epeak [keV] : 118.795 ( -31.7021 185.711 )
Norm@50keV : 9.35028E-03 ( -0.0032908 0.00573459 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.87 using 59 PHA bins.
# Reduced chi-squared = 0.8905 for 56 degrees of freedom
# Null hypothesis probability = 7.048134e-01
Photon flux (15-150 keV) in 17.57 sec: 0.605899 ( -0.038308 0.038297 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.61237e-07 ( -5.96484e-08 5.94534e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.709818 ( -0.479327 0.972436 )
beta : -1.77954 ( 1.78085 0.378342 )
Epeak [keV] : 105.486 ( -55.5284 167.105 )
Norm@50keV : 1.04686E-02 ( -0.00421442 0.03748 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.64 using 59 PHA bins.
# Reduced chi-squared = 0.9025 for 55 degrees of freedom
# Null hypothesis probability = 6.789306e-01
Photon flux (15-150 keV) in 17.57 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) = 3.71e-07
S(50-100 keV) = 5.13e-07
T90 vs. Hardness ratio plot
T90 = 42.567999958992 sec.
Hardness ratio (energy fluence ratio) = 1.38275
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.41353
Count Ratio (50-100 keV) / (15-25 keV) = 0.982822
Mask shadow pattern
IMX = 1.291940800163469E-01, IMY = -1.930691838926180E-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:
-239.920000 -4.192000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9841 -15.6354 0.3 21.6 -82.5 8.6520 34.6 0.4 Sco X-1
254.3821 35.3859 6.7 57.0 -13.8 1.6128 1.7 4.5 Her X-1
255.9810 -37.8422 0.4 20.0 -154.8 6.8037 28.6 0.3 4U 1700-377
256.3578 -36.4268 3.6 18.7 -153.2 0.7486 3.2 3.8 GX 349+2
263.1814 -24.6041 0.0 5.7 -141.3 0.5060 2.3 12.7 GX 1+4
264.5624 -44.2929 31.2 24.1 -176.8 0.0843 0.4 12.2 4U 1735-44
268.4664 -1.4921 14.5 18.9 2.6 0.1715 0.8 6.4 SW J1753.5-0127
270.2910 -25.0643 3.6 5.5 148.0 0.7215 3.2 1.0 GX 5-1
270.2023 -25.7026 3.4 6.1 151.9 0.7749 3.5 5.9 GRS 1758-258
273.9442 -13.9630 5.7 9.1 45.1 0.4090 2.0 5.7 GX 17+2
275.9209 -30.3698 2.7 12.8 142.2 0.9756 4.3 0.3 H1820-303
284.9958 -25.0694 17.5 17.1 108.1 0.1648 0.7 9.2 HT1900.1-2455
288.9506 10.7921 33.9 37.8 35.1 0.1437 0.3 12.9 GRS 1915+105
262.9617 -33.8144 3.2 14.0 -166.7 0.7804 3.6 1.8 GX 354-0
283.8324 -22.8876 2.5 15.7 101.1 1.0830 4.6 ------ UNKNOWN
263.4842 30.8994 2.9 51.3 -5.4 2.0947 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-4.192000 13.380590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.1310 -15.5190 7.0 21.5 -82.1 0.0943 1.6 11.4 Sco X-1
254.5674 35.3492 5.3 56.9 -13.6 -0.4344 -2.2 5.4 Her X-1
256.1477 -38.0125 0.0 20.1 -155.4 0.1501 3.1 12.7 4U 1700-377
256.4875 -36.2789 5.2 18.5 -153.2 0.1025 2.2 9.0 GX 349+2
262.8470 -24.6944 3.6 5.9 -139.7 0.1539 3.2 9.3 GX 1+4
264.7683 -44.3007 4.8 24.1 -177.1 0.1220 2.4 9.0 4U 1735-44
268.5094 -1.4866 10.0 18.9 2.7 -0.0567 -1.2 8.7 SW J1753.5-0127
270.2835 -25.0926 13.5 5.6 148.3 0.0429 0.9 0.8 GX 5-1
270.2719 -25.6618 38.2 6.1 151.2 -0.0168 -0.3 5.2 GRS 1758-258
273.9481 -13.8876 8.1 9.1 44.8 -0.0696 -1.4 9.5 GX 17+2
276.1012 -30.5075 0.0 13.0 142.1 -0.0809 -1.7 12.4 H1820-303
284.8645 -24.8532 7.5 16.9 107.4 -0.0831 -1.5 10.2 HT1900.1-2455
288.9430 10.8531 10.6 37.8 35.1 0.0973 1.1 10.2 GRS 1915+105
262.8187 -33.7495 6.0 14.0 -166.2 -0.0893 -1.9 9.9 GX 354-0
311.9585 -37.5077 2.0 42.3 122.5 1.2204 5.9 ------ UNKNOWN
283.7079 -5.0724 2.3 22.1 47.3 0.2867 5.0 ------ UNKNOWN
278.4864 -12.9754 0.4 13.1 56.2 1.4987 30.3 ------ UNKNOWN
275.5814 6.0622 2.3 27.6 16.9 0.2945 5.1 ------ UNKNOWN
245.1807 4.2751 2.1 32.7 -45.1 0.3301 5.4 ------ UNKNOWN
220.2578 -30.0702 2.7 43.3 -114.1 0.8243 4.3 ------ UNKNOWN
214.2304 -44.4375 2.5 49.7 -133.0 0.9591 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
65.580590 422.380000
840.080000 962.117900
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0015 -15.6480 2.3 32.5 -128.4 17.9414 5.0 1.4 Sco X-1
255.9676 -37.8578 2.6 31.9 -174.8 12.5289 4.4 1.2 4U 1700-377
256.5050 -36.5613 12.2 30.7 -173.6 2.6693 0.9 8.9 GX 349+2
263.0820 -24.6096 6.9 18.6 -160.4 4.3114 1.7 9.1 GX 1+4
264.9384 -44.3651 6.4 33.4 168.1 -5.8385 -1.8 9.8 4U 1735-44
268.2595 -1.4975 18.6 15.3 -71.8 1.5401 0.6 7.0 SW J1753.5-0127
270.3286 -25.1432 6.0 14.4 -178.5 4.8696 1.9 4.5 GX 5-1
270.3495 -25.8987 4.2 15.0 179.9 -6.9360 -2.8 9.7 GRS 1758-258
274.2020 -13.9754 10.6 4.3 -133.2 2.7082 1.1 12.0 GX 17+2
276.1606 -30.3112 0.0 17.4 157.1 -2.8326 -1.2 12.7 H1820-303
284.9924 -25.0654 9.6 13.5 124.3 3.1874 1.2 9.0 HT1900.1-2455
288.6944 11.0384 7.5 26.1 -6.3 -3.7183 -1.5 8.3 GRS 1915+105
299.6253 35.1772 7.6 52.2 -7.7 8.2867 1.5 2.3 Cyg X-1
262.8272 -33.7891 4.7 25.2 -177.8 5.8906 2.4 8.5 GX 354-0
291.0356 -39.8806 2.9 29.1 130.3 13.5278 4.0 ------ UNKNOWN
316.6962 28.8202 3.0 55.8 11.3 45.6120 3.8 ------ UNKNOWN
272.4901 -46.2264 2.7 33.6 157.9 14.7517 4.2 ------ UNKNOWN
294.8157 -3.7740 2.9 18.6 32.0 8.5404 3.9 ------ UNKNOWN
244.3114 -46.5046 3.1 44.1 -175.9 16.6439 3.8 ------ UNKNOWN
Plot creation:
Sat Aug 8 00:34:01 EDT 2015