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
150.5326 45.7345 0.0024 29.0366 -10.8583 8.5071341 81.264 TRIG_00293795
Foreground time interval of the image:
-35.740 23.828 (delta_t = 59.568 [sec])
Background time interval of the image:
-239.272 -35.740 (delta_t = 203.532 [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 0.512000
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 0.512000
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 0.512000
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 -35.740 sec. to 23.828 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96623 ( -0.04345 0.0436488 )
Norm@50keV : 8.41959E-03 ( -0.000188963 0.00018875 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.90 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 57 degrees of freedom
# Null hypothesis probability = 4.057364e-01
Photon flux (15-150 keV) in 59.57 sec: 1.24373 ( -0.0323732 0.0325453 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.61821e-06 ( -1.02077e-07 1.02114e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -35.740 sec. to 23.828 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52011 ( -0.195191 0.186976 )
Epeak [keV] : 54.7823 ( -5.51245 7.23816 )
Norm@50keV : 1.38248E-02 ( -0.00254094 0.00328225 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.44 using 59 PHA bins.
# Reduced chi-squared = 0.7400 for 56 degrees of freedom
# Null hypothesis probability = 9.268449e-01
Photon flux (15-150 keV) in 59.57 sec: 1.19262 ( -0.0376 0.03792 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.45062e-06 ( -1.22833e-07 1.22524e-07 ) ergs/cm2
Band function
Time interval is from -35.740 sec. to 23.828 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14476 ( -0.43215 1.11691 )
beta : -2.17804 ( -0.496365 0.123757 )
Epeak [keV] : 45.2480 ( -10.9203 10.9732 )
Norm@50keV : 2.30665E-02 ( -0.00995066 0.105755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.55 using 59 PHA bins.
# Reduced chi-squared = 0.7008 for 55 degrees of freedom
# Null hypothesis probability = 9.549298e-01
Photon flux (15-150 keV) in 59.57 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.44038e-06 ( -4.43997e-06 -1.19408e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.8728 ( )
R^2/D10^2 : 0.205498 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 415.83 using 59 PHA bins.
# Reduced chi-squared = 7.2952 for 57 degrees of freedom
# Null hypothesis probability = 5.602356e-56
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.303e-07 1.844e-08
25- 50 1.466e-06 3.842e-08
50-150 1.527e-06 7.059e-08
15-150 3.424e-06 8.102e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 85.3547 (-6.19663 7.00643)
Norm : 5.49062 (-0.216255 0.227027)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.32 using 59 PHA bins.
# Reduced chi-squared = 0.7776 for 57 degrees of freedom
# Null hypothesis probability = 8.897934e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.517e-07 3.098e-08
25- 50 1.424e-06 3.544e-08
50-150 2.097e-06 8.906e-08
15-150 4.372e-06 1.066e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.11963 (-0.57542 0.593073)
R1^2/D10^2 : 1.36737 (-0.330361 0.483555)
kT2 [keV] : 22.8830 (-2.00195 2.54451)
R2^2/D10^2 : 1.62205E-02 (-0.00564941 0.00757369)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.03 using 59 PHA bins.
# Reduced chi-squared = 0.9278 for 55 degrees of freedom
# Null hypothesis probability = 6.271297e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.667e-07 6.046e-08
25- 50 1.452e-06 6.731e-08
50-150 2.113e-06 1.516e-07
15-150 4.332e-06 2.022e-07
Peak spectrum fit
Power-law model
Time interval is from 1.396 sec. to 2.396 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73527 ( -0.0576373 0.0580533 )
Norm@50keV : 5.71272E-02 ( -0.00193658 0.00193321 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.28 using 59 PHA bins.
# Reduced chi-squared = 1.514 for 57 degrees of freedom
# Null hypothesis probability = 7.402267e-03
Photon flux (15-150 keV) in 1 sec: 7.68303 ( -0.270055 0.270606 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.27603e-07 ( -1.84246e-08 1.84578e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.396 sec. to 2.396 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00081 ( -0.274932 0.258952 )
Epeak [keV] : 68.5324 ( -6.98412 11.7319 )
Norm@50keV : 0.132532 ( -0.0333663 0.048133 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.40 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 56 degrees of freedom
# Null hypothesis probability = 3.200344e-01
Photon flux (15-150 keV) in 1 sec: 7.37147 ( -0.28699 0.28789 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.03536e-07 ( -2.0364e-08 2.0337e-08 ) ergs/cm2
Band function
Time interval is from 1.396 sec. to 2.396 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.489912 ( -0.583656 1.19025 )
beta : -2.11168 ( -0.876065 0.187178 )
Epeak [keV] : 52.6974 ( -13.3973 17.6262 )
Norm@50keV : 0.269481 ( -0.141884 1.39242 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.60 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 55 degrees of freedom
# Null hypothesis probability = 3.793566e-01
Photon flux (15-150 keV) in 1 sec: 7.30065 ( -0.30065 -0.29443 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.04807e-07 ( -5.048e-07 -1.9834e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.6249 ( )
R^2/D10^2 : 1.16985 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 202.06 using 59 PHA bins.
# Reduced chi-squared = 3.5449 for 57 degrees of freedom
# Null hypothesis probability = 4.196448e-18
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.597e-08 2.985e-09
25- 50 1.664e-07 6.850e-09
50-150 2.005e-07 1.395e-08
15-150 4.128e-07 1.565e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 128.353 (-18.3927 18.1953)
Norm : 31.9792 (-1.33341 1.69831)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.74 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 57 degrees of freedom
# Null hypothesis probability = 2.514801e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.303e-08 5.495e-09
25- 50 1.502e-07 8.000e-09
50-150 2.769e-07 6.415e-08
15-150 5.102e-07 6.855e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.92069 (-0.970464 0.988824)
R1^2/D10^2 : 5.46449 (-1.62029 2.73859)
kT2 [keV] : 24.4400 (-3.18968 4.7291)
R2^2/D10^2 : 9.26961E-02 (-0.0469949 0.0739081)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.49 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 55 degrees of freedom
# Null hypothesis probability = 2.842175e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.126e-08 7.540e-09
25- 50 1.604e-07 1.320e-08
50-150 2.693e-07 4.530e-08
15-150 5.010e-07 5.865e-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: 1.96623 ( -0.04345 0.0436488 )
Norm@50keV : 8.41959E-03 ( -0.000188963 0.00018875 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.90 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 57 degrees of freedom
# Null hypothesis probability = 4.057364e-01
Photon flux (15-150 keV) in 59.57 sec: 1.24373 ( -0.0323732 0.0325453 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.61821e-06 ( -1.02077e-07 1.02114e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52011 ( -0.195191 0.186976 )
Epeak [keV] : 54.7823 ( -5.51245 7.23816 )
Norm@50keV : 1.38248E-02 ( -0.00254094 0.00328225 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.44 using 59 PHA bins.
# Reduced chi-squared = 0.7400 for 56 degrees of freedom
# Null hypothesis probability = 9.268449e-01
Photon flux (15-150 keV) in 59.57 sec: 1.19262 ( -0.0376 0.03792 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.45062e-06 ( -1.22833e-07 1.22524e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14476 ( -0.43215 1.11691 )
beta : -2.17804 ( -0.496365 0.123757 )
Epeak [keV] : 45.2480 ( -10.9203 10.9732 )
Norm@50keV : 2.30665E-02 ( -0.00995066 0.105755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.55 using 59 PHA bins.
# Reduced chi-squared = 0.7008 for 55 degrees of freedom
# Null hypothesis probability = 9.549298e-01
Photon flux (15-150 keV) in 59.57 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.44038e-06 ( -4.43997e-06 -1.19408e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.38e-06
S(50-100 keV) = 1.41e-06
T90 vs. Hardness ratio plot
T90 = 36.1240000128746 sec.
Hardness ratio (energy fluence ratio) = 1.02174
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.16859
Count Ratio (50-100 keV) / (15-25 keV) = 0.638325
Mask shadow pattern
IMX = 5.452047759902531E-01, IMY = 1.045785973572260E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-239.272000 -35.740000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4131 35.4883 347.2 48.1 -158.1 -0.0095 -0.0 9.0 Her X-1
143.0678 24.3775 2.7 50.9 -16.8 1.2866 4.3 ------ UNKNOWN
253.9330 35.9569 2.4 47.5 -158.0 1.2999 4.7 ------ UNKNOWN
186.1344 24.2859 2.2 42.3 -70.4 3.0985 5.4 ------ UNKNOWN
195.5676 25.7410 3.6 41.0 -83.3 1.9959 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-35.740000 23.828000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3629 35.4682 9.3 48.1 -158.1 -0.2547 -1.2 8.9 Her X-1
50.7364 70.5900 2.2 39.9 85.5 2.0522 5.3 ------ UNKNOWN
150.5326 45.7345 0.1 29.0 -10.9 8.5072 81.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
144.028620 610.428620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9917 -15.6360 0.8 51.0 -140.9 15.8387 13.8 0.8 Sco X-1
254.3734 35.1856 5.9 11.9 131.1 0.4327 1.9 10.3 Her X-1
268.2933 -1.5287 5.1 45.3 -176.6 1.0487 2.2 6.4 SW J1753.5-0127
288.7950 10.9330 2.4 50.5 151.8 5.7313 4.7 0.8 GRS 1915+105
242.6181 81.5093 3.0 46.4 46.2 4.1810 3.8 ------ UNKNOWN
221.5690 15.0704 3.3 25.9 -90.6 1.1675 3.5 ------ UNKNOWN
Plot creation:
Sun May 31 09:03:16 EDT 2015