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
221.6239 -35.4635 0.0062 46.9040 -161.2942 5.3206865 30.952 TRIG_00648601
Foreground time interval of the image:
-34.060 12.373 (delta_t = 46.433 [sec])
Background time interval of the image:
-239.528 -34.060 (delta_t = 205.468 [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 -34.060 sec. to 70.236 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77451 ( -0.0845965 0.0852805 )
Norm@50keV : 4.44390E-03 ( -0.000212592 0.000212049 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.10 using 59 PHA bins.
# Reduced chi-squared = 1.247 for 57 degrees of freedom
# Null hypothesis probability = 9.913289e-02
Photon flux (15-150 keV) in 104.3 sec: 0.606415 ( -0.0307473 0.0308639 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.27145e-06 ( -2.08482e-07 2.08937e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -34.060 sec. to 70.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48251 ( -0.354599 0.321561 )
Epeak [keV] : 89.7930 ( -25.0478 -89.7935 )
Norm@50keV : 6.20473E-03 ( -0.00184077 0.00301905 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.82 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 56 degrees of freedom
# Null hypothesis probability = 1.166938e-01
Photon flux (15-150 keV) in 104.3 sec: 0.595383 ( -0.032943 0.03307 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.18869e-06 ( -2.3115e-07 2.29627e-07 ) ergs/cm2
Band function
Time interval is from -34.060 sec. to 70.236 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.238405 ( -1.48849 0.670659 )
beta : -1.88318 ( 1.88539 0.133162 )
Epeak [keV] : 34.3747 ( -18.1453 69.4753 )
Norm@50keV : 9.44674E-02 ( -0.0937761 176.618 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.39 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 55 degrees of freedom
# Null hypothesis probability = 1.397194e-01
Photon flux (15-150 keV) in 104.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.17372e-06 ( -4.17299e-06 -2.20668e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.5886 ( )
R^2/D10^2 : 8.93250E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 178.86 using 59 PHA bins.
# Reduced chi-squared = 3.1379 for 57 degrees of freedom
# Null hypothesis probability = 1.677228e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.642e-07 3.192e-08
25- 50 1.314e-06 7.666e-08
50-150 1.573e-06 1.418e-07
15-150 3.252e-06 1.768e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 125.640 (-24.7707 26.492)
Norm : 2.49204 (-0.152272 0.204029)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.83 using 59 PHA bins.
# Reduced chi-squared = 1.225 for 57 degrees of freedom
# Null hypothesis probability = 1.183745e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.756e-07 5.898e-08
25- 50 1.218e-06 8.031e-08
50-150 2.223e-06 6.289e-07
15-150 4.117e-06 6.618e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.07476 (-0.927365 1.01221)
R1^2/D10^2 : 0.694411 (-0.255934 0.455431)
kT2 [keV] : 25.3524 (-3.68557 5.61962)
R2^2/D10^2 : 6.65295E-03 (-0.00347822 0.00563164)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.30 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 55 degrees of freedom
# Null hypothesis probability = 1.235101e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.657e-07 1.087e-07
25- 50 1.262e-06 1.444e-07
50-150 2.231e-06 3.885e-07
15-150 4.159e-06 6.967e-07
Peak spectrum fit
Power-law model
Time interval is from 1.980 sec. to 2.980 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53799 ( -0.170255 0.171868 )
Norm@50keV : 2.98442E-02 ( -0.0028582 0.0028521 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.63 using 59 PHA bins.
# Reduced chi-squared = 0.8006 for 57 degrees of freedom
# Null hypothesis probability = 8.602464e-01
Photon flux (15-150 keV) in 1 sec: 3.76507 ( -0.380222 0.381532 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.81447e-07 ( -2.86952e-08 2.87927e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.980 sec. to 2.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54139 ( -0.176522 0.167672 )
Epeak [keV] : 9999.32 ( -9999.36 -9999.36 )
Norm@50keV : 2.99103E-02 ( -0.0299138 0.0154125 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.65 using 59 PHA bins.
# Reduced chi-squared = 0.8151 for 56 degrees of freedom
# Null hypothesis probability = 8.369332e-01
Photon flux (15-150 keV) in 1 sec: 3.77604 ( -0.20618 0.37041 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80879e-07 ( -2.8163e-08 2.9026e-08 ) ergs/cm2
Band function
Time interval is from 1.980 sec. to 2.980 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.74399 ( -4.74399 -4.74399 )
beta : -1.57005 ( -0.189131 0.180396 )
Epeak [keV] : 21.9581 ( -21.9581 7.32082 )
Norm@50keV : 4537.20 ( -429.739 1.68834e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.33 using 59 PHA bins.
# Reduced chi-squared = 0.8241 for 55 degrees of freedom
# Null hypothesis probability = 8.206961e-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] : 15.9763 (-2.25669 2.6488)
R^2/D10^2 : 0.328627 (-0.136142 0.233271)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.52 using 59 PHA bins.
# Reduced chi-squared = 1.570 for 57 degrees of freedom
# Null hypothesis probability = 3.844963e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.735e-08 3.685e-09
25- 50 7.291e-08 1.108e-08
50-150 1.300e-07 2.381e-08
15-150 2.203e-07 2.810e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-57.5291 -200)
Norm : 15.3502 (-1.46024 1.46024)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.90 using 59 PHA bins.
# Reduced chi-squared = 0.8404 for 57 degrees of freedom
# Null hypothesis probability = 7.992138e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.823e-08 5.000e-09
25- 50 7.354e-08 2.002e-08
50-150 1.613e-07 7.348e-08
15-150 2.731e-07 8.900e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.13285 (-1.54531 1.94125)
R1^2/D10^2 : 4.32981 (-2.48039 6.56112)
kT2 [keV] : 35.0514 (-9.27432 24.0912)
R2^2/D10^2 : 1.83222E-02 (-0.0141009 0.0330115)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.12 using 59 PHA bins.
# Reduced chi-squared = 0.8022 for 55 degrees of freedom
# Null hypothesis probability = 8.531795e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.926e-08 1.442e-08
25- 50 7.205e-08 2.514e-08
50-150 1.764e-07 8.528e-08
15-150 2.878e-07 1.016e-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: 1.68527 ( -0.0854499 0.0858813 )
Norm@50keV : 7.79499E-03 ( -0.000370186 0.000369547 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.89 using 59 PHA bins.
# Reduced chi-squared = 0.9805 for 57 degrees of freedom
# Null hypothesis probability = 5.169321e-01
Photon flux (15-150 keV) in 46.43 sec: 1.02999 ( -0.0534741 0.0537026 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.35501e-06 ( -1.64339e-07 1.64618e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50378 ( -0.348284 0.248218 )
Epeak [keV] : 144.353 ( )
Norm@50keV : 9.52809E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.00 using 59 PHA bins.
# Reduced chi-squared = 0.9821 for 56 degrees of freedom
# Null hypothesis probability = 5.128023e-01
Photon flux (15-150 keV) in 46.43 sec: 1.01793 ( -0.057288 0.05756 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.32e-06 ( -1.78138e-07 1.76991e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.685464 ( 0.800234 5.44041 )
beta : -1.76712 ( 1.76728 0.128416 )
Epeak [keV] : 45.3382 ( -45.3003 284.894 )
Norm@50keV : 3.23739E-02 ( -0.0327043 2863.58 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.80 using 59 PHA bins.
# Reduced chi-squared = 0.9782 for 55 degrees of freedom
# Null hypothesis probability = 5.204822e-01
Photon flux (15-150 keV) in 46.43 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.30268e-06 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.19e-06
S(50-100 keV) = 1.39e-06
T90 vs. Hardness ratio plot
T90 = 70.9559999108315 sec.
Hardness ratio (energy fluence ratio) = 1.16807
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.42225
Count Ratio (50-100 keV) / (15-25 keV) = 0.937082
Mask shadow pattern
IMX = -1.012317140710808E+00, IMY = 3.427650886563163E-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:
-239.528000 -34.060000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9902 -15.6599 0.4 25.9 -126.4 6.2080 28.6 1.3 Sco X-1
255.9866 -37.8441 56.1 23.1 173.2 -0.0410 -0.2 0.0 4U 1700-377
256.4354 -36.4231 2.5 21.8 175.0 0.8555 4.6 0.0 GX 349+2
262.9160 -24.7917 5.2 9.9 -164.9 0.4090 2.2 5.8 GX 1+4
264.7709 -44.4361 5.8 25.7 151.4 0.4383 2.0 1.5 4U 1735-44
268.4319 -1.3169 4.2 18.4 -51.6 0.4922 2.7 9.0 SW J1753.5-0127
270.1014 -25.1338 6.8 6.0 155.8 0.3241 1.7 10.5 GX 5-1
270.2710 -25.6802 4.3 6.5 153.1 0.5477 3.0 4.1 GRS 1758-258
274.0571 -14.0352 3.4 5.7 -19.5 0.6067 3.4 3.0 GX 17+2
275.9195 -30.3454 2.6 11.5 122.1 0.7830 4.4 1.3 H1820-303
284.8993 -25.0113 6.6 13.2 77.0 -0.3585 -1.7 9.2 HT1900.1-2455
288.7965 10.9452 120.9 34.6 -10.4 -0.0214 -0.1 0.1 GRS 1915+105
262.9380 -33.8203 12.6 16.5 166.8 0.1572 0.9 2.7 GX 354-0
238.1211 -62.9364 2.5 49.3 159.1 2.7350 4.7 ------ UNKNOWN
309.6726 21.8633 2.4 55.3 3.2 3.8905 4.7 ------ UNKNOWN
238.1680 4.5671 3.9 41.0 -98.1 2.9234 3.0 ------ UNKNOWN
222.4224 -12.0337 3.6 48.1 -129.3 2.5910 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-34.060000 12.372620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9906 -15.4277 0.0 26.0 -125.9 0.0391 0.4 12.8 Sco X-1
255.9037 -37.7179 7.0 23.0 173.5 -0.1477 -1.6 8.5 4U 1700-377
256.5478 -36.2999 9.0 21.6 175.0 -0.1135 -1.3 9.2 GX 349+2
263.1646 -24.8117 23.5 9.8 -165.6 -0.0382 -0.5 9.4 GX 1+4
264.9677 -44.4898 12.2 25.8 151.1 -0.0899 -0.9 9.9 4U 1735-44
268.3503 -1.3357 8.3 18.4 -51.9 0.1171 1.4 7.1 SW J1753.5-0127
270.2689 -25.0085 11.0 5.8 154.7 0.0847 1.1 4.3 GX 5-1
270.2296 -25.5916 12.4 6.4 153.6 0.0815 1.0 9.9 GRS 1758-258
273.9218 -14.1636 17.2 5.6 -20.3 -0.0501 -0.7 9.1 GX 17+2
275.7576 -30.4414 20.5 11.6 123.0 0.0457 0.6 9.7 H1820-303
285.0479 -24.9083 6.0 13.3 76.3 0.1671 1.9 1.0 HT1900.1-2455
288.7018 10.9405 19.9 34.5 -10.5 -0.0561 -0.6 5.7 GRS 1915+105
263.2416 -33.8289 0.0 16.4 166.0 -0.1074 -1.4 12.6 GX 354-0
303.8030 -50.9623 2.6 40.3 108.6 1.4015 4.4 ------ UNKNOWN
224.2891 -47.7894 2.5 47.7 -178.3 0.7976 4.7 ------ UNKNOWN
221.6239 -35.4635 0.4 46.9 -161.3 5.3209 31.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
94.972590 907.972590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2007 -60.6516 7.5 41.0 -151.6 1.6969 1.5 3.8 Cen X-3
186.8587 -62.8617 3.7 34.8 -160.2 2.4273 3.1 7.8 GX 301-2
244.9706 -15.6329 0.4 28.8 45.1 26.2077 32.7 0.7 Sco X-1
256.0625 -37.6908 5.8 27.6 97.6 -1.8930 -2.0 9.9 4U 1700-377
256.4810 -36.5162 7.5 28.1 95.2 1.5594 1.5 6.0 GX 349+2
263.1442 -24.7948 4.6 37.2 77.7 4.6697 2.5 7.9 GX 1+4
264.6214 -44.3489 9.7 33.8 111.3 -1.4902 -1.2 8.0 4U 1735-44
262.9928 -33.8294 58.1 33.8 92.2 0.2747 0.2 0.4 GX 354-0
233.1349 -41.8381 2.8 11.0 121.6 2.2733 4.1 ------ UNKNOWN
233.0246 -13.8436 2.6 23.9 20.9 2.6616 4.4 ------ UNKNOWN
209.5819 -64.7240 1.0 30.2 -177.1 7.5358 11.6 ------ UNKNOWN
224.1541 6.8484 3.1 42.4 -3.6 3.7220 3.7 ------ UNKNOWN
222.8213 -2.8596 2.6 32.6 -5.1 3.2215 4.5 ------ UNKNOWN
158.3137 -44.9704 4.2 48.0 -129.1 9.0970 2.8 ------ UNKNOWN
Plot creation:
Sat Aug 8 00:35:59 EDT 2015