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
290.5854 -38.7304 0.0198 25.6970 -75.4924 0.0558499 9.688 TRIG_00104298
Foreground time interval of the image:
0.004 0.132 (delta_t = 0.128 [sec])
Background time interval of the image:
-299.176 0.004 (delta_t = 299.180 [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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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 0.004 sec. to 0.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37638 ( -0.294023 0.290449 )
Norm@50keV : 2.50761E-02 ( -0.00436356 0.00436279 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.96 using 59 PHA bins.
# Reduced chi-squared = 0.7362 for 57 degrees of freedom
# Null hypothesis probability = 9.320917e-01
Photon flux (15-150 keV) in 0.128 sec: 3.03782 ( -0.555579 0.55909 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11685e-08 ( -5.76517e-09 5.80954e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.004 sec. to 0.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.318881 ( -1.91476 1.18019 )
Epeak [keV] : 84.2545 ( -23.3292 -84.2547 )
Norm@50keV : 8.03981E-02 ( -0.0803974 0.541364 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.30 using 59 PHA bins.
# Reduced chi-squared = 0.7196 for 56 degrees of freedom
# Null hypothesis probability = 9.436140e-01
Photon flux (15-150 keV) in 0.128 sec: 2.90784 ( -0.5843 0.58571 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94806e-08 ( -6.28826e-09 6.2999e-09 ) ergs/cm2
Band function
Time interval is from 0.004 sec. to 0.132 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.241531 ( 0.147199 0.147199 )
beta : -1.92122 ( 2.09079 0.863947 )
Epeak [keV] : 65.5005 ( -65.3172 208.512 )
Norm@50keV : 0.168288 ( -0.176799 101.758 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.98 using 59 PHA bins.
# Reduced chi-squared = 0.7268 for 55 degrees of freedom
# Null hypothesis probability = 9.361760e-01
Photon flux (15-150 keV) in 0.128 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9707e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.6370 (-2.90004 3.76801)
R^2/D10^2 : 0.258047 (-0.133073 0.248579)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.80 using 59 PHA bins.
# Reduced chi-squared = 0.7510 for 57 degrees of freedom
# Null hypothesis probability = 9.185644e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.873e-09 6.605e-10
25- 50 8.142e-09 2.433e-09
50-150 1.598e-08 5.479e-09
15-150 2.599e-08 7.066e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-77.3059 -199.363)
Norm : 12.7694 (-2.22551 2.2256)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.31 using 59 PHA bins.
# Reduced chi-squared = 0.7423 for 57 degrees of freedom
# Null hypothesis probability = 9.267028e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.070e-09 2.399e-09
25- 50 7.829e-09 4.440e-09
50-150 1.717e-08 9.914e-09
15-150 2.907e-08 1.628e-08
Double BB
R1^2/D10^2 : 0.456948 ( )
kT2 [keV] : 196.682 (-196.796 -196.796)
R2^2/D10^2 : 2.59275E-04 (-0.000248742 0.200449)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.76 using 59 PHA bins.
#Fit statistic : Chi-Squared = 39.98 using 59 PHA bins.
#Fit statistic : Chi-Squared = 39.94 using 59 PHA bins.
# Reduced chi-squared = 0.7411 for 55 degrees of freedom
# Reduced chi-squared = 0.7269 for 55 degrees of freedom
# Reduced chi-squared = 0.7261 for 55 degrees of freedom
# Null hypothesis probability = 9.238013e-01
# Null hypothesis probability = 9.361393e-01
# Null hypothesis probability = 9.367795e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.927e-09 1.145e-09
25- 50 7.539e-09 2.807e-09
50-150 1.682e-08 5.926e-09
15-150 2.729e-08 7.846e-09
Peak spectrum fit
Power-law model
Time interval is from -0.430 sec. to 0.570 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45937 ( -0.572321 0.543132 )
Norm@50keV : 4.66719E-03 ( -0.00127513 0.00127167 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.29 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 57 degrees of freedom
# Null hypothesis probability = 3.920028e-01
Photon flux (15-150 keV) in 1 sec: 0.576518 ( -0.168867 0.170894 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.45854e-08 ( -1.30408e-08 1.32602e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.430 sec. to 0.570 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47723 ( -0.594816 0.527872 )
Epeak [keV] : 9999.25 ( -9999.36 -9999.36 )
Norm@50keV : 4.64482E-03 ( -0.00127791 0.0228607 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.30 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 56 degrees of freedom
# Null hypothesis probability = 3.561186e-01
Photon flux (15-150 keV) in 1 sec: 0.582572 ( -0.174732 0.165375 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.44674e-08 ( -1.29111e-08 1.29466e-08 ) ergs/cm2
Band function
Time interval is from -0.430 sec. to 0.570 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.59514 ( 9.59514 9.59514 )
beta : -1.45937 ( -0.543152 0.572196 )
Epeak [keV] : 100.946 ( -100.946 -100.946 )
Norm@50keV : 0.634337 ( -0.173366 0.172838 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.29 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 55 degrees of freedom
# Null hypothesis probability = 3.219611e-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] : 13.4517 (-3.87095 7.68926)
R^2/D10^2 : 9.25333E-02 (-0.0922989 0.23104)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.94 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 57 degrees of freedom
# Null hypothesis probability = 2.459552e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.547e-09 2.161e-09
25- 50 1.267e-08 7.438e-09
50-150 1.477e-08 9.555e-09
15-150 3.099e-08 1.916e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 2.36731 (-0.649347 0.804549)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.90 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 57 degrees of freedom
# Null hypothesis probability = 3.707799e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.895e-09 3.578e-09
25- 50 1.134e-08 6.745e-09
50-150 2.487e-08 1.449e-08
15-150 4.210e-08 2.522e-08
Double BB
R1^2/D10^2 : 0.252336 ( )
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 9.12662E-05 (-4.6781e-05 0.00178104)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.57 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.25 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.23 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 55 degrees of freedom
# Reduced chi-squared = 1.023 for 55 degrees of freedom
# Reduced chi-squared = 1.022 for 55 degrees of freedom
# Null hypothesis probability = 2.254560e-01
# Null hypothesis probability = 4.277379e-01
# Null hypothesis probability = 4.287126e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.822e-09 2.781e-09
25- 50 1.094e-08 6.475e-09
50-150 1.807e-08 1.199e-08
15-150 3.483e-08 1.983e-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: 1.37638 ( -0.294023 0.290449 )
Norm@50keV : 2.50761E-02 ( -0.00436356 0.00436279 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.96 using 59 PHA bins.
# Reduced chi-squared = 0.7362 for 57 degrees of freedom
# Null hypothesis probability = 9.320917e-01
Photon flux (15-150 keV) in 0.128 sec: 3.03782 ( -0.555579 0.55909 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11685e-08 ( -5.76517e-09 5.80954e-09 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.318881 ( -1.91476 1.18019 )
Epeak [keV] : 84.2545 ( -23.3292 -84.2547 )
Norm@50keV : 8.03981E-02 ( -0.0803974 0.541364 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.30 using 59 PHA bins.
# Reduced chi-squared = 0.7196 for 56 degrees of freedom
# Null hypothesis probability = 9.436140e-01
Photon flux (15-150 keV) in 0.128 sec: 2.90784 ( -0.5843 0.58571 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94806e-08 ( -6.28826e-09 6.2999e-09 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.241531 ( 0.147199 0.147199 )
beta : -1.92122 ( 2.09079 0.863947 )
Epeak [keV] : 65.5005 ( -65.3172 208.512 )
Norm@50keV : 0.168288 ( -0.176799 114.895 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.98 using 59 PHA bins.
# Reduced chi-squared = 0.7268 for 55 degrees of freedom
# Null hypothesis probability = 9.361760e-01
Photon flux (15-150 keV) in 0.128 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9707e-08 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 7.23e-09
S(50-100 keV) = 1.11e-08
T90 vs. Hardness ratio plot
T90 = 0.112000018358231 sec.
Hardness ratio (energy fluence ratio) = 1.53527
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.80092
Count Ratio (50-100 keV) / (15-25 keV) = 1.82004
Mask shadow pattern
IMX = 1.205452569865317E-01, IMY = 4.658595688132238E-01
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-299.176000 0.004000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.8925 -62.8407 8.1 46.3 43.0 1.4861 1.4 7.7 GX 301-2
244.9804 -15.6467 0.2 26.6 159.6 21.3837 74.8 0.4 Sco X-1
255.9502 -37.8312 2.0 2.4 162.9 1.4530 5.8 1.9 4U 1700-377
256.4260 -36.4179 1.5 3.7 177.1 1.9314 7.4 0.6 GX 349+2
263.0578 -24.7435 4.6 16.1 -153.8 0.6872 2.5 2.7 GX 1+4
264.6839 -44.3529 7.6 7.0 -43.2 0.3580 1.5 6.4 4U 1735-44
268.5192 -1.5606 6.0 39.9 -155.6 -0.7659 -1.9 11.1 SW J1753.5-0127
270.3545 -25.1414 4.4 18.5 -133.0 0.8093 2.6 5.3 GX 5-1
270.3518 -25.7248 3.3 18.1 -132.0 1.1341 3.8 2.9 GRS 1758-258
273.9708 -14.0495 1.8 29.9 -139.2 2.1338 6.4 2.2 GX 17+2
276.1103 -30.3749 7.6 18.2 -109.7 0.3979 1.5 9.6 H1820-303
284.8339 -24.8454 19.7 27.7 -108.3 0.2084 0.6 11.9 HT1900.1-2455
262.8904 -33.9178 4.8 7.6 -135.1 0.6077 2.4 7.0 GX 354-0
238.7673 -43.7312 3.2 14.2 75.5 0.9021 3.7 ------ UNKNOWN
243.0431 -26.5425 3.0 17.9 141.3 0.8541 3.8 ------ UNKNOWN
296.1554 -54.7085 3.1 29.6 -40.7 1.0868 3.8 ------ UNKNOWN
331.2291 -51.2298 3.4 50.7 -44.5 4.9938 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.004000 0.132000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.3713 -62.7255 3.7 46.6 43.2 0.0473 3.2 8.3 GX 301-2
244.8387 -15.6167 12.0 26.7 159.3 0.0044 1.0 8.3 Sco X-1
255.7789 -37.7100 0.0 2.6 161.2 0.0027 0.7 12.7 4U 1700-377
256.2605 -36.5143 25.0 3.6 174.8 0.0018 0.5 10.1 GX 349+2
262.8809 -24.9143 0.0 15.9 -154.2 0.0025 0.6 12.3 GX 1+4
264.9417 -44.3986 4.8 7.2 -43.8 0.0095 2.4 9.1 4U 1735-44
268.3671 -1.5014 5.7 39.9 -155.8 0.0122 2.0 2.9 SW J1753.5-0127
270.2838 -25.0789 26.5 18.6 -133.3 -0.0018 -0.4 0.0 GX 5-1
270.3176 -25.7226 2529.6 18.0 -132.0 0.0000 0.0 1.5 GRS 1758-258
274.0800 -13.8788 4.8 30.1 -139.1 -0.0125 -2.4 10.4 GX 17+2
275.7891 -30.4875 8.2 17.9 -109.9 0.0063 1.4 10.1 H1820-303
285.0954 -24.7913 3.6 27.9 -108.1 -0.0184 -3.2 8.4 HT1900.1-2455
263.1574 -33.7697 6.6 7.9 -134.3 0.0068 1.7 9.3 GX 354-0
212.9994 -23.7572 2.0 40.4 106.7 0.0817 5.7 ------ UNKNOWN
254.5335 -78.7237 2.4 38.7 7.4 0.0275 4.8 ------ UNKNOWN
290.5836 -38.7265 1.2 25.7 -75.5 0.0558 9.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
-299.176000 242.846100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.8566 -62.8151 5.8 46.4 43.1 3.6804 2.0 6.1 GX 301-2
244.9800 -15.6456 0.1 26.6 159.6 45.0411 88.9 0.3 Sco X-1
255.9596 -37.8329 1.4 2.4 163.1 3.8403 8.4 1.4 4U 1700-377
256.4210 -36.4211 1.9 3.7 177.0 2.8524 6.1 0.7 GX 349+2
263.1124 -24.8816 7.0 16.0 -153.5 0.7916 1.6 9.9 GX 1+4
264.9085 -44.2823 10.0 7.1 -44.4 0.4564 1.2 12.3 4U 1735-44
268.5129 -1.5100 5.2 39.9 -155.6 -1.5757 -2.2 9.3 SW J1753.5-0127
270.3197 -25.0771 5.9 18.6 -133.2 1.0846 2.0 1.9 GX 5-1
270.3369 -25.7583 3.5 18.0 -131.9 1.7802 3.3 2.1 GRS 1758-258
273.9808 -14.0444 1.8 29.9 -139.2 3.8192 6.5 1.5 GX 17+2
276.0483 -30.3903 6.6 18.1 -109.8 0.7944 1.8 6.5 H1820-303
284.8243 -24.8465 33.9 27.7 -108.3 0.2096 0.3 12.4 HT1900.1-2455
262.8863 -33.8993 4.1 7.7 -135.2 1.2650 2.8 6.4 GX 354-0
235.8955 5.2523 2.7 49.4 158.1 5.9288 4.2 ------ UNKNOWN
299.8587 -62.4744 3.1 33.8 -27.7 2.0088 3.8 ------ UNKNOWN
Plot creation:
Sun May 31 17:37:09 EDT 2015