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
257.7530 -36.7294 0.0110 39.3393 -139.8618 3.1261913 17.523 TRIG_00375659
Foreground time interval of the image:
-10.500 14.744 (delta_t = 25.244 [sec])
Background time interval of the image:
-41.035 -10.500 (delta_t = 30.535 [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 -10.500 sec. to 14.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01969 ( -0.137661 0.134648 )
Norm@50keV : 7.70640E-03 ( -0.000569144 0.000566529 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.15 using 59 PHA bins.
# Reduced chi-squared = 0.9499 for 57 degrees of freedom
# Null hypothesis probability = 5.828107e-01
Photon flux (15-150 keV) in 25.24 sec: 0.888234 ( -0.067433 0.0677602 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08877e-06 ( -1.6162e-07 1.62648e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.500 sec. to 14.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01384 ( -0.138768 0.135675 )
Epeak [keV] : 9998.28 ( -9998.25 -9998.25 )
Norm@50keV : 7.75133E-03 ( -0.000563388 0.0055489 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.15 using 59 PHA bins.
# Reduced chi-squared = 0.9669 for 56 degrees of freedom
# Null hypothesis probability = 5.453782e-01
Photon flux (15-150 keV) in 25.24 sec: 0.887271 ( -0.071443 0.067901 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09382e-06 ( -1.74615e-07 1.57679e-07 ) ergs/cm2
Band function
Time interval is from -10.500 sec. to 14.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.834520 ( 0.83452 0.83452 )
beta : -1.01969 ( -0.134623 0.137726 )
Epeak [keV] : 54.1517 ( -54.1517 939.378 )
Norm@50keV : 1.28468E-02 ( -0.00569641 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.15 using 59 PHA bins.
# Reduced chi-squared = 0.9845 for 55 degrees of freedom
# Null hypothesis probability = 5.072189e-01
Photon flux (15-150 keV) in 25.24 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] : 22.6599 (-2.26271 2.66105)
R^2/D10^2 : 2.82120E-02 (-0.00828294 0.0112013)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.01 using 59 PHA bins.
# Reduced chi-squared = 1.509 for 57 degrees of freedom
# Null hypothesis probability = 7.798527e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.674e-08 1.002e-08
25- 50 3.590e-07 4.152e-08
50-150 1.378e-06 1.625e-07
15-150 1.803e-06 1.827e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.71614 (-0.278264 0.278204)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 98.95 using 59 PHA bins.
# Reduced chi-squared = 1.736 for 57 degrees of freedom
# Null hypothesis probability = 4.812111e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.335e-07 2.036e-08
25- 50 4.491e-07 5.591e-08
50-150 9.850e-07 3.118e-07
15-150 1.668e-06 4.131e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.17966 (-3.35744 4.34242)
R1^2/D10^2 : 0.377114 (-0.25735 1.48363)
kT2 [keV] : 35.1998 (-8.57391 31.8122)
R2^2/D10^2 : 6.37914E-03 (-0.00525307 0.00541083)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.009710e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.452e-07 6.939e-08
25- 50 3.971e-07 1.336e-07
50-150 1.550e-06 6.849e-07
15-150 2.092e-06 6.554e-07
Peak spectrum fit
Power-law model
Time interval is from 0.556 sec. to 1.556 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.911181 ( -0.340002 0.318817 )
Norm@50keV : 1.62362E-02 ( -0.00297149 0.00291967 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.48 using 59 PHA bins.
# Reduced chi-squared = 0.7453 for 57 degrees of freedom
# Null hypothesis probability = 9.239103e-01
Photon flux (15-150 keV) in 1 sec: 1.86379 ( -0.338459 0.341517 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81432e-07 ( -3.37813e-08 3.40578e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.556 sec. to 1.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06106 ( )
Epeak [keV] : 20.7301 ( )
Norm@50keV : 9.89270E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.44 using 59 PHA bins.
# Reduced chi-squared = 0.7401 for 56 degrees of freedom
# Null hypothesis probability = 9.267896e-01
Photon flux (15-150 keV) in 1 sec: 1.85413 ( -0.35331 0.34711 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80782e-07 ( -3.5299e-08 3.4566e-08 ) ergs/cm2
Band function
Time interval is from 0.556 sec. to 1.556 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.796746 ( 0.796746 0.796746 )
beta : -0.911194 ( -0.318789 0.340016 )
Epeak [keV] : 33.0835 ( -33.0835 -33.0835 )
Norm@50keV : 2.49836E-02 ( -0.0115752 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.48 using 59 PHA bins.
# Reduced chi-squared = 0.7724 for 55 degrees of freedom
# Null hypothesis probability = 8.912509e-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] : 25.6370 (-5.92652 8.81818)
R^2/D10^2 : 4.20652E-02 (-0.0242487 0.0520029)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.72 using 59 PHA bins.
# Reduced chi-squared = 0.8372 for 57 degrees of freedom
# Null hypothesis probability = 8.045777e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.738e-09 2.085e-09
25- 50 2.723e-08 9.380e-09
50-150 1.322e-07 4.060e-08
15-150 1.641e-07 5.548e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 7.63762 (-1.41047 1.4103)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.51 using 59 PHA bins.
# Reduced chi-squared = 0.9387 for 57 degrees of freedom
# Null hypothesis probability = 6.069780e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.903e-08 1.114e-08
25- 50 3.661e-08 2.082e-08
50-150 8.029e-08 4.615e-08
15-150 1.359e-07 7.815e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.11230 (-4.78459 7.4706)
R1^2/D10^2 : 0.783840 (-0.669183 22.3165)
kT2 [keV] : 37.9314 (-13.0852 113.387)
R2^2/D10^2 : 1.17726E-02 (-0.0104057 0.0242381)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.76 using 59 PHA bins.
# Reduced chi-squared = 0.7593 for 55 degrees of freedom
# Null hypothesis probability = 9.058758e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.169e-08 6.810e-09
25- 50 3.213e-08 1.758e-08
50-150 1.408e-07 7.840e-08
15-150 1.846e-07 9.645e-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: 1.01969 ( -0.137661 0.134648 )
Norm@50keV : 7.70640E-03 ( -0.000569144 0.000566529 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.15 using 59 PHA bins.
# Reduced chi-squared = 0.9499 for 57 degrees of freedom
# Null hypothesis probability = 5.828107e-01
Photon flux (15-150 keV) in 25.24 sec: 0.888234 ( -0.067433 0.0677602 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08877e-06 ( -1.6162e-07 1.62648e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01384 ( -0.138768 0.135675 )
Epeak [keV] : 9998.28 ( -9998.25 -9998.25 )
Norm@50keV : 7.75133E-03 ( -0.000563388 0.0055489 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.15 using 59 PHA bins.
# Reduced chi-squared = 0.9669 for 56 degrees of freedom
# Null hypothesis probability = 5.453782e-01
Photon flux (15-150 keV) in 25.24 sec: 0.887271 ( -0.071443 0.067901 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09382e-06 ( -1.74615e-07 1.57679e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.834520 ( 0.83452 0.83452 )
beta : -1.01969 ( -0.134623 0.137726 )
Epeak [keV] : 54.1517 ( -54.1517 937.16 )
Norm@50keV : 1.28468E-02 ( -0.00569641 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.15 using 59 PHA bins.
# Reduced chi-squared = 0.9845 for 55 degrees of freedom
# Null hypothesis probability = 5.072189e-01
Photon flux (15-150 keV) in 25.24 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) = 3.92e-07
S(50-100 keV) = 7.73e-07
T90 vs. Hardness ratio plot
T90 = 17.5199999213219 sec.
Hardness ratio (energy fluence ratio) = 1.97194
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.69298
Count Ratio (50-100 keV) / (15-25 keV) = 1.98054
Mask shadow pattern
IMX = -6.266061842258196E-01, IMY = 5.283662211896585E-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:
-41.035410 -10.500000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9630 -15.5859 2.4 37.4 -100.8 1.8349 4.8 3.4 Sco X-1
254.5525 35.5355 0.0 46.5 -19.9 0.2354 0.9 12.5 Her X-1
255.8280 -37.8862 9.3 41.2 -139.2 0.3199 1.2 7.9 4U 1700-377
256.6136 -36.4882 8.6 39.7 -138.5 -0.3038 -1.3 9.4 GX 349+2
263.0589 -24.8463 6.3 27.3 -132.2 0.3151 1.8 6.6 GX 1+4
264.9089 -44.4360 7.8 43.1 -153.0 -0.3673 -1.5 7.2 4U 1735-44
268.4922 -1.2817 0.0 12.8 -69.2 0.2590 1.6 12.7 SW J1753.5-0127
270.1108 -24.9465 15.0 23.7 -144.5 -0.1180 -0.8 12.3 GX 5-1
270.1349 -25.6982 31.5 24.3 -145.4 0.0542 0.4 9.4 GRS 1758-258
274.1241 -13.8695 7.5 12.2 -136.3 0.2196 1.5 12.2 GX 17+2
276.0758 -30.3256 8.4 27.0 -160.4 0.2276 1.4 8.2 H1820-303
284.9790 -24.8028 6.9 21.4 -179.7 -0.2671 -1.7 7.7 HT1900.1-2455
288.8211 11.0981 11.3 16.7 37.6 0.1674 1.0 9.3 GRS 1915+105
299.4558 35.1319 3.7 42.5 32.6 0.9892 3.1 7.8 Cyg X-1
263.1634 -33.9712 238.6 34.5 -143.2 -0.0096 -0.0 11.9 GX 354-0
285.3274 -62.2923 2.2 58.7 -172.2 4.6990 5.2 ------ UNKNOWN
281.5412 -61.1153 2.7 57.4 -170.1 2.8686 4.2 ------ UNKNOWN
267.9934 -22.3322 2.9 22.5 -136.8 0.6147 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-10.500000 14.744000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.1230 -15.5303 50.3 37.3 -100.8 -0.0574 -0.2 10.6 Sco X-1
254.4026 35.2561 5.6 46.3 -20.3 0.4054 2.0 5.8 Her X-1
255.9903 -37.9811 22.9 41.2 -139.4 0.0972 0.5 8.2 4U 1700-377
256.6207 -36.5253 4.1 39.8 -138.6 0.5172 2.8 10.8 GX 349+2
263.1653 -24.7286 5.0 27.2 -132.2 -0.2833 -2.3 8.6 GX 1+4
264.6207 -44.4172 4.8 43.2 -152.7 0.4493 2.4 5.6 4U 1735-44
268.3395 -1.3707 8.7 12.9 -69.7 0.1379 1.3 5.2 SW J1753.5-0127
270.3449 -25.0747 3.9 23.7 -145.1 0.3108 3.0 3.3 GX 5-1
270.1846 -25.8749 7.7 24.5 -145.7 -0.1602 -1.5 10.2 GRS 1758-258
274.0267 -14.1833 7.0 12.5 -136.8 -0.1615 -1.7 8.9 GX 17+2
275.7391 -30.2497 143.3 27.0 -159.7 -0.0086 -0.1 11.9 H1820-303
284.9124 -25.0731 7.9 21.7 -179.4 -0.1508 -1.5 11.4 HT1900.1-2455
288.7736 10.7926 10.8 16.4 38.0 0.1116 1.1 9.3 GRS 1915+105
299.5316 35.0912 4.4 42.5 32.7 0.6154 2.6 7.2 Cyg X-1
262.8412 -33.9119 26.3 34.6 -142.7 -0.0625 -0.4 8.7 GX 354-0
312.0536 -39.7420 2.2 45.6 156.5 1.2435 5.3 ------ UNKNOWN
268.9398 44.4911 2.1 49.4 -1.2 1.2224 5.4 ------ UNKNOWN
276.5337 -4.4967 2.5 4.6 -89.7 0.4278 4.6 ------ UNKNOWN
263.8886 -22.2823 2.1 24.9 -129.5 0.6361 5.5 ------ UNKNOWN
257.7530 -36.7294 0.7 39.3 -139.9 3.1262 17.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
-60.336000 482.711700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9580 -15.6219 1.7 37.4 -100.8 34.2855 6.9 1.7 Sco X-1
254.5710 35.4496 13.1 46.4 -19.9 3.3478 0.9 8.5 Her X-1
255.8434 -37.9649 9.2 41.2 -139.2 4.4916 1.3 9.9 4U 1700-377
256.2989 -36.5284 104.1 39.9 -138.2 0.3569 0.1 9.1 GX 349+2
263.0229 -24.8863 7.8 27.3 -132.1 3.2951 1.5 8.5 GX 1+4
264.6822 -44.3045 11.5 43.0 -152.6 3.4076 1.0 9.1 4U 1735-44
268.4644 -1.2864 4.1 12.8 -69.0 6.0063 2.8 11.5 SW J1753.5-0127
270.3577 -25.1873 6.3 23.8 -145.2 3.7175 1.8 7.6 GX 5-1
270.1461 -25.7571 14.2 24.4 -145.4 1.6368 0.8 8.5 GRS 1758-258
274.1309 -13.8683 0.0 12.2 -136.2 4.2230 2.3 12.4 GX 17+2
276.0927 -30.4015 6.1 27.0 -160.4 4.1100 1.9 8.9 H1820-303
285.0748 -25.0665 24.3 21.7 -179.8 -1.0822 -0.5 9.0 HT1900.1-2455
288.7188 10.9438 5.0 16.6 37.6 5.1186 2.3 4.7 GRS 1915+105
299.5077 35.1464 2.9 42.6 32.7 17.0117 3.9 5.2 Cyg X-1
263.1819 -33.9785 0.0 34.5 -143.1 1.0770 0.4 12.9 GX 354-0
277.1293 -30.7361 3.1 27.2 -162.4 7.8219 3.7 ------ UNKNOWN
279.0789 -60.0810 3.0 56.3 -168.6 34.9028 3.9 ------ UNKNOWN
237.6939 18.5867 2.9 48.2 -50.6 36.0743 4.0 ------ UNKNOWN
Plot creation:
Sun May 31 02:34:54 EDT 2015