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
214.2366 -11.1198 0.0066 19.6024 -147.5253 0.7839156 29.274 TRIG_00564028
Foreground time interval of the image:
-0.384 5.896 (delta_t = 6.280 [sec])
Background time interval of the image:
-239.432 -0.384 (delta_t = 239.048 [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 -0.384 sec. to 5.896 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27610 ( -0.13023 0.134947 )
Norm@50keV : 6.27231E-03 ( -0.000522278 0.000514689 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.71 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 57 degrees of freedom
# Null hypothesis probability = 1.568031e-01
Photon flux (15-150 keV) in 6.28 sec: 1.08175 ( -0.0651574 0.0653578 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7481e-07 ( -2.5438e-08 2.58193e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.384 sec. to 5.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99488 ( )
Epeak [keV] : 0.762979 ( -0.270533 0.728382 )
Norm@50keV : 9.04191E-03 ( -0.00115845 0.00135191 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.00 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 56 degrees of freedom
# Null hypothesis probability = 1.305682e-01
Photon flux (15-150 keV) in 6.28 sec: 1.07575 ( -0.07316 0.06975 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.70965e-07 ( -3.37795e-08 2.90381e-08 ) ergs/cm2
Band function
Time interval is from -0.384 sec. to 5.896 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.15422 ( )
beta : -9.00270 ( )
Epeak [keV] : 61.9522 ( )
Norm@50keV : 1.53076E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 113.89 using 59 PHA bins.
# Reduced chi-squared = 2.0707 for 55 degrees of freedom
# Null hypothesis probability = 5.379013e-06
Photon flux (15-150 keV) in 6.28 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] : 8.70489 ( )
R^2/D10^2 : 0.783063 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 128.20 using 59 PHA bins.
# Reduced chi-squared = 2.2491 for 57 degrees of freedom
# Null hypothesis probability = 2.123932e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.124e-08 7.501e-09
25- 50 1.436e-07 1.017e-08
50-150 4.942e-08 9.674e-09
15-150 2.643e-07 1.934e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 45.3067 (-7.30483 9.79262)
Norm : 6.26417 (-0.76411 0.902451)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.65 using 59 PHA bins.
# Reduced chi-squared = 1.292 for 57 degrees of freedom
# Null hypothesis probability = 6.807074e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.384e-08 8.070e-09
25- 50 1.299e-07 8.133e-09
50-150 1.146e-07 1.893e-08
15-150 3.383e-07 2.368e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.67306 (-0.973867 1.18064)
R1^2/D10^2 : 7.37220 (-4.29333 13.3021)
kT2 [keV] : 15.6759 (-3.0637 5.79374)
R2^2/D10^2 : 5.45099E-02 (-0.0394579 0.0852158)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.54 using 59 PHA bins.
# Reduced chi-squared = 1.319 for 55 degrees of freedom
# Null hypothesis probability = 5.660313e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.027e-07 2.229e-08
25- 50 1.191e-07 2.926e-08
50-150 1.244e-07 4.297e-08
15-150 3.463e-07 9.313e-08
Peak spectrum fit
Power-law model
Time interval is from 0.276 sec. to 1.276 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06577 ( -0.144621 0.150295 )
Norm@50keV : 1.48119E-02 ( -0.00139548 0.00137035 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.45 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 57 degrees of freedom
# Null hypothesis probability = 1.246878e-01
Photon flux (15-150 keV) in 1 sec: 2.29170 ( -0.166126 0.166254 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37198e-07 ( -1.17152e-08 1.19085e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.276 sec. to 1.276 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85118 ( -0.636181 0.251886 )
Epeak [keV] : 29.0321 ( -24.0065 -29.0322 )
Norm@50keV : 1.96578E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.03 using 59 PHA bins.
# Reduced chi-squared = 1.233 for 56 degrees of freedom
# Null hypothesis probability = 1.133859e-01
Photon flux (15-150 keV) in 1 sec: 2.26572 ( -0.17882 0.17812 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33863e-07 ( -1.4387e-08 1.4281e-08 ) ergs/cm2
Band function
Time interval is from 0.276 sec. to 1.276 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62471 ( 0.83315 0.83315 )
beta : -2.23224 ( 2.23957 0.301299 )
Epeak [keV] : 31.6943 ( -31.1495 -31.1495 )
Norm@50keV : 2.74469E-02 ( -0.00955968 12327.2 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.84 using 59 PHA bins.
# Reduced chi-squared = 1.252 for 55 degrees of freedom
# Null hypothesis probability = 9.933088e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34008e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.61797 (-0.830499 0.912681)
R^2/D10^2 : 1.18311 (-0.352515 0.501925)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 109.53 using 59 PHA bins.
# Reduced chi-squared = 1.9216 for 57 degrees of freedom
# Null hypothesis probability = 3.586078e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.197e-08 2.945e-09
25- 50 5.164e-08 4.580e-09
50-150 2.405e-08 4.895e-09
15-150 9.766e-08 8.130e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 60.9492 (-12.7592 17.9978)
Norm : 11.7368 (-1.47311 1.63759)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.98 using 59 PHA bins.
# Reduced chi-squared = 1.245 for 57 degrees of freedom
# Null hypothesis probability = 1.009016e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.957e-08 3.050e-09
25- 50 4.522e-08 3.250e-09
50-150 5.213e-08 1.010e-08
15-150 1.269e-07 1.165e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.39704 (-1.48017 1.60116)
R1^2/D10^2 : 8.02600 (-4.76324 20.803)
kT2 [keV] : 18.3759 (-4.73994 10.0185)
R2^2/D10^2 : 6.93443E-02 (-0.0571753 0.172771)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.44 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 55 degrees of freedom
# Null hypothesis probability = 5.748749e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.090e-08 9.985e-09
25- 50 4.247e-08 1.164e-08
50-150 5.507e-08 2.998e-08
15-150 1.284e-07 4.257e-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: 2.27610 ( -0.13023 0.134947 )
Norm@50keV : 6.27231E-03 ( -0.000522278 0.000514689 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.71 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 57 degrees of freedom
# Null hypothesis probability = 1.568031e-01
Photon flux (15-150 keV) in 6.28 sec: 1.08175 ( -0.0651574 0.0653578 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7481e-07 ( -2.5438e-08 2.58193e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99488 ( )
Epeak [keV] : 0.762979 ( -0.270533 0.728382 )
Norm@50keV : 9.04191E-03 ( -0.00115845 0.00135191 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.00 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 56 degrees of freedom
# Null hypothesis probability = 1.305682e-01
Photon flux (15-150 keV) in 6.28 sec: 1.07575 ( -0.07316 0.06975 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.70965e-07 ( -3.37795e-08 2.90381e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.15422 ( )
beta : -9.00270 ( )
Epeak [keV] : 61.9522 ( )
Norm@50keV : 1.53076E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 113.89 using 59 PHA bins.
# Reduced chi-squared = 2.0707 for 55 degrees of freedom
# Null hypothesis probability = 5.379013e-06
Photon flux (15-150 keV) in 6.28 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) = 1.21e-07
S(50-100 keV) = 9.95e-08
T90 vs. Hardness ratio plot
T90 = 4.77599990367889 sec.
Hardness ratio (energy fluence ratio) = 0.822314
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.811265
Count Ratio (50-100 keV) / (15-25 keV) = 0.361366
Mask shadow pattern
IMX = -3.004419539939238E-01, IMY = 1.912158196150189E-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:
-239.432000 -0.384000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9831 -15.6390 0.4 22.0 118.2 7.2207 30.9 0.2 Sco X-1
254.3773 35.4716 5.5 41.6 10.3 0.6766 2.1 8.7 Her X-1
255.9545 -37.9673 2.6 45.4 130.9 -4.1943 -4.4 7.5 4U 1700-377
256.6170 -36.4165 5.3 44.5 128.9 -1.7821 -2.2 8.8 GX 349+2
268.3976 -1.3710 6.2 38.4 72.8 1.4078 1.8 5.2 SW J1753.5-0127
203.0348 45.4840 3.4 50.7 -44.4 4.0695 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.384000 5.896000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8700 -15.4979 5.9 21.8 118.2 -0.0629 -2.0 10.6 Sco X-1
254.4854 35.2477 14.2 41.4 10.6 0.0360 0.8 5.8 Her X-1
255.8421 -37.7705 7.7 45.2 130.8 -0.1748 -1.5 8.2 4U 1700-377
256.5542 -36.5519 0.0 44.6 129.1 0.1125 0.9 9.6 GX 349+2
268.3368 -1.5708 5.1 38.4 73.2 -0.2212 -2.3 7.3 SW J1753.5-0127
257.2546 -35.5677 2.3 44.2 127.6 0.6056 5.0 ------ UNKNOWN
245.5618 -48.2567 2.2 50.7 146.5 0.7824 5.4 ------ UNKNOWN
219.3631 -44.7038 2.2 46.3 170.3 0.3116 5.2 ------ UNKNOWN
214.0937 -33.3361 2.6 37.1 -177.9 0.1657 4.4 ------ UNKNOWN
214.2366 -11.1198 0.4 19.6 -147.5 0.7838 29.3 ------ UNKNOWN
195.7320 -14.0264 2.4 37.0 -134.9 0.2038 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
52.068580 962.655900
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.4962 -62.7907 5.8 55.3 175.9 4.9012 2.0 4.6 GX 301-2
244.9912 -15.6343 0.4 30.2 82.9 30.1499 32.4 0.8 Sco X-1
207.6280 47.4892 3.7 58.9 -24.3 12.1356 3.2 ------ UNKNOWN
186.7748 27.6056 4.5 47.0 -53.1 7.8035 2.6 ------ UNKNOWN
Plot creation:
Sat May 30 16:03:49 EDT 2015