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
202.8656 42.0997 0.0040 44.0309 -28.6781 6.9821156 48.430 TRIG_00158855
Foreground time interval of the image:
-24.932 13.332 (delta_t = 38.264 [sec])
Background time interval of the image:
-299.088 -24.932 (delta_t = 274.156 [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 -24.932 sec. to 13.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11750 ( -0.0514033 0.0509945 )
Norm@50keV : 1.29197E-02 ( -0.000378374 0.000377305 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.45 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.196470e-01
Photon flux (15-150 keV) in 38.26 sec: 1.50124 ( -0.0470437 0.0472011 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.13962e-06 ( -1.45976e-07 1.46034e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.932 sec. to 13.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.748953 ( -0.220239 0.209759 )
Epeak [keV] : 212.094 ( -55.7589 184.77 )
Norm@50keV : 1.81892E-02 ( -0.00314466 0.0039716 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.17 using 59 PHA bins.
# Reduced chi-squared = 0.9315 for 56 degrees of freedom
# Null hypothesis probability = 6.207718e-01
Photon flux (15-150 keV) in 38.26 sec: 1.46637 ( -0.05033 0.05059 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08185e-06 ( -1.51471e-07 1.51127e-07 ) ergs/cm2
Band function
Time interval is from -24.932 sec. to 13.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.749058 ( -0.22646 0.194107 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 212.115 ( -55.8291 184.651 )
Norm@50keV : 1.81863E-02 ( -0.00314295 0.00397464 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.17 using 59 PHA bins.
# Reduced chi-squared = 0.9485 for 55 degrees of freedom
# Null hypothesis probability = 5.836019e-01
Photon flux (15-150 keV) in 38.26 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] : 23.0118 ( )
R^2/D10^2 : 4.47376E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 219.15 using 59 PHA bins.
# Reduced chi-squared = 3.8447 for 57 degrees of freedom
# Null hypothesis probability = 7.412840e-21
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.642e-07 9.508e-09
25- 50 8.912e-07 3.749e-08
50-150 3.525e-06 1.429e-07
15-150 4.581e-06 1.435e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 6.58207 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 288.81 using 59 PHA bins.
# Reduced chi-squared = 5.0669 for 57 degrees of freedom
# Null hypothesis probability = 1.014095e-32
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.271e-07 1.970e-08
25- 50 1.206e-06 3.730e-08
50-150 2.646e-06 8.322e-08
15-150 4.479e-06 1.473e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.95842 (-0.970686 1.09661)
R1^2/D10^2 : 0.695723 (-0.239657 0.395922)
kT2 [keV] : 31.8208 (-2.41418 3.10606)
R2^2/D10^2 : 1.38491E-02 (-0.00372449 0.00427941)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.99 using 59 PHA bins.
# Reduced chi-squared = 0.8180 for 55 degrees of freedom
# Null hypothesis probability = 8.301718e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.846e-07 5.299e-08
25- 50 1.037e-06 8.207e-08
50-150 3.698e-06 2.242e-07
15-150 5.120e-06 3.023e-07
Peak spectrum fit
Power-law model
Time interval is from 2.880 sec. to 3.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04472 ( -0.108227 0.10689 )
Norm@50keV : 4.72949E-02 ( -0.00288214 0.00287359 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.49 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 57 degrees of freedom
# Null hypothesis probability = 3.510616e-01
Photon flux (15-150 keV) in 1 sec: 5.46027 ( -0.343314 0.344259 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.0356e-07 ( -3.20887e-08 3.2159e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.880 sec. to 3.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.849989 ( -0.423304 0.244452 )
Epeak [keV] : 358.864 ( -358.862 -358.862 )
Norm@50keV : 5.71162E-02 ( -0.0119632 0.0274724 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.77 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 56 degrees of freedom
# Null hypothesis probability = 3.405402e-01
Photon flux (15-150 keV) in 1 sec: 5.40964 ( -0.3569 0.35798 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.0083e-07 ( -3.299e-08 3.2857e-08 ) ergs/cm2
Band function
Time interval is from 2.880 sec. to 3.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.862948 ( 0.154374 0.154374 )
beta : -8.98260 ( 8.39239 18.3924 )
Epeak [keV] : 381.528 ( -226.015 -381.528 )
Norm@50keV : 5.63719E-02 ( -0.00334662 0.0237605 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.77 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.065958e-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] : 23.6383 (-1.93047 2.16276)
R^2/D10^2 : 0.153946 (-0.0366628 0.0472233)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 107.97 using 59 PHA bins.
# Reduced chi-squared = 1.8942 for 57 degrees of freedom
# Null hypothesis probability = 5.346328e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.538e-08 1.880e-09
25- 50 8.472e-08 8.690e-09
50-150 3.531e-07 3.020e-08
15-150 4.532e-07 3.530e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.359 ( )
Norm : 22.8095 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 124.29 using 59 PHA bins.
# Reduced chi-squared = 2.1805 for 57 degrees of freedom
# Null hypothesis probability = 6.547005e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.680e-08 3.975e-09
25- 50 1.093e-07 9.045e-09
50-150 2.396e-07 5.955e-08
15-150 4.057e-07 5.825e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.37741 (-1.44618 1.75933)
R1^2/D10^2 : 3.38586 (-1.73855 4.04931)
kT2 [keV] : 33.6201 (-4.57487 6.84441)
R2^2/D10^2 : 4.57568E-02 (-0.0199135 0.0272512)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.23 using 59 PHA bins.
# Reduced chi-squared = 0.9860 for 55 degrees of freedom
# Null hypothesis probability = 5.039126e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.868e-08 1.210e-08
25- 50 9.564e-08 2.198e-08
50-150 3.765e-07 8.890e-08
15-150 5.108e-07 8.730e-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: 1.11750 ( -0.0514033 0.0509945 )
Norm@50keV : 1.29197E-02 ( -0.000378374 0.000377305 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.45 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.196470e-01
Photon flux (15-150 keV) in 38.26 sec: 1.50124 ( -0.0470437 0.0472011 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.13962e-06 ( -1.45976e-07 1.46034e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.748953 ( -0.220239 0.209759 )
Epeak [keV] : 212.094 ( -55.7589 184.77 )
Norm@50keV : 1.81892E-02 ( -0.00314466 0.0039716 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.17 using 59 PHA bins.
# Reduced chi-squared = 0.9315 for 56 degrees of freedom
# Null hypothesis probability = 6.207718e-01
Photon flux (15-150 keV) in 38.26 sec: 1.46637 ( -0.05033 0.05059 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08185e-06 ( -1.51471e-07 1.51127e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.749058 ( -0.22646 0.194107 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 212.115 ( -55.8291 184.651 )
Norm@50keV : 1.81863E-02 ( -0.00314295 0.00397464 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.17 using 59 PHA bins.
# Reduced chi-squared = 0.9485 for 55 degrees of freedom
# Null hypothesis probability = 5.836019e-01
Photon flux (15-150 keV) in 38.26 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) = 1.03e-06
S(50-100 keV) = 1.89e-06
T90 vs. Hardness ratio plot
T90 = 12.4079999923706 sec.
Hardness ratio (energy fluence ratio) = 1.83495
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.90878
Count Ratio (50-100 keV) / (15-25 keV) = 2.1858
Mask shadow pattern
IMX = 8.481412304303927E-01, IMY = 4.639230038776114E-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:
-299.088000 -24.932000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9802 -15.6392 0.1 27.5 177.5 25.1842 90.5 0.1 Sco X-1
254.4615 35.3184 3.2 27.9 38.1 1.1619 3.7 1.5 Her X-1
255.9042 -38.0112 12.1 51.7 173.2 0.7525 1.0 10.8 4U 1700-377
256.3464 -36.5752 66.0 50.5 172.1 0.1349 0.2 10.1 GX 349+2
263.1369 -24.7344 7.9 43.0 157.1 0.8986 1.5 7.0 GX 1+4
268.3958 -1.4438 7.2 31.9 121.8 0.7235 1.6 1.7 SW J1753.5-0127
270.4191 -25.1791 0.0 47.6 150.4 -1.3832 -1.5 9.5 GX 5-1
270.2909 -25.8999 5.1 48.1 151.2 -2.0530 -2.2 9.4 GRS 1758-258
273.9245 -14.1036 4.6 43.0 135.5 2.2969 2.5 6.2 GX 17+2
263.1154 -33.8635 6.0 50.6 164.1 -1.7314 -1.9 6.5 GX 354-0
279.6357 18.4385 2.5 39.9 84.9 5.0200 4.7 ------ UNKNOWN
276.7239 47.6749 2.1 48.3 43.8 6.2973 5.4 ------ UNKNOWN
221.8263 63.6156 2.6 53.8 0.9 3.7604 4.4 ------ UNKNOWN
212.4550 -36.6079 3.6 53.9 -143.5 4.9684 3.2 ------ UNKNOWN
211.9246 -36.5224 4.2 54.1 -143.0 4.2603 2.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-24.932000 13.332000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9546 -15.6544 1.1 27.5 177.6 -0.8737 -10.9 1.7 Sco X-1
254.5245 35.4865 8.1 28.1 38.0 0.1344 1.4 9.2 Her X-1
255.9854 -37.8458 28.4 51.6 173.0 -0.0908 -0.4 0.1 4U 1700-377
256.4372 -36.4246 7.7 50.4 171.9 0.3009 1.5 0.1 GX 349+2
263.1358 -24.7962 42.2 43.1 157.2 0.0415 0.3 7.5 GX 1+4
268.4735 -1.5144 21.1 32.0 121.8 0.0673 0.5 7.3 SW J1753.5-0127
270.1491 -24.9791 0.0 47.3 150.5 -0.5339 -2.5 9.5 GX 5-1
270.4245 -25.6858 10.8 48.0 150.9 0.2441 1.1 7.4 GRS 1758-258
274.1416 -14.0478 7.9 43.1 135.3 0.3212 1.5 7.9 GX 17+2
263.0939 -33.7222 4.9 50.5 164.0 -0.5100 -2.3 8.5 GX 354-0
202.8656 42.0997 0.2 44.0 -28.7 6.9816 48.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
Plot creation:
Sun May 31 15:24:51 EDT 2015