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
195.4752 74.5693 0.0123 13.8607 -42.9273 0.5708646 15.628 TRIG_00414592
Foreground time interval of the image:
47.644 67.292 (delta_t = 19.648 [sec])
Background time interval of the image:
-239.000 47.644 (delta_t = 286.644 [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 64.000000
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 64.000000
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 64.000000
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 47.644 sec. to 67.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71889 ( -0.189532 0.196177 )
Norm@50keV : 1.73852E-03 ( -0.000211846 0.000207553 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.02 using 59 PHA bins.
# Reduced chi-squared = 0.8775 for 57 degrees of freedom
# Null hypothesis probability = 7.321943e-01
Photon flux (15-150 keV) in 19.65 sec: 0.232440 ( -0.0242694 0.0242739 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15854e-07 ( -3.99477e-08 4.07512e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 47.644 sec. to 67.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43324 ( -0.755928 0.644967 )
Epeak [keV] : 90.1928 ( -61.8858 -90.1931 )
Norm@50keV : 2.49115E-03 ( -0.000954304 0.00383065 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.48 using 59 PHA bins.
# Reduced chi-squared = 0.8835 for 56 degrees of freedom
# Null hypothesis probability = 7.185180e-01
Photon flux (15-150 keV) in 19.65 sec: 0.229668 ( -0.025061 0.025039 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07198e-07 ( -4.41987e-08 2.25916e-08 ) ergs/cm2
Band function
Time interval is from 47.644 sec. to 67.292 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43304 ( -0.501228 0.652628 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 90.1373 ( -40.1122 -90.1373 )
Norm@50keV : 2.49148E-03 ( -0.000940076 0.00383146 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.48 using 59 PHA bins.
# Reduced chi-squared = 0.8996 for 55 degrees of freedom
# Null hypothesis probability = 6.848197e-01
Photon flux (15-150 keV) in 19.65 sec: 0.229162 ( ) 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] : 12.4077 (-1.7244 2.01279)
R^2/D10^2 : 4.92276E-02 (-0.020474 0.0354355)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.25 using 59 PHA bins.
# Reduced chi-squared = 1.303 for 57 degrees of freedom
# Null hypothesis probability = 6.209182e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.156e-08 5.502e-09
25- 50 1.032e-07 1.432e-08
50-150 9.767e-08 2.433e-08
15-150 2.325e-07 3.368e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 127.214 (-46.3882 -124.197)
Norm : 0.970644 (-0.119344 0.157133)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.69 using 59 PHA bins.
# Reduced chi-squared = 0.8718 for 57 degrees of freedom
# Null hypothesis probability = 7.430708e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.955e-08 7.791e-09
25- 50 8.952e-08 1.949e-08
50-150 1.643e-07 8.840e-08
15-150 3.034e-07 1.025e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.94843 (-1.28382 1.66166)
R1^2/D10^2 : 0.958567 (-0.640721 1.79187)
kT2 [keV] : 20.0487 (-4.06414 6.58118)
R2^2/D10^2 : 7.20367E-03 (-0.00466883 0.0096741)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.17 using 59 PHA bins.
# Reduced chi-squared = 0.8577 for 55 degrees of freedom
# Null hypothesis probability = 7.643743e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.490e-08 2.642e-08
25- 50 8.264e-08 3.004e-08
50-150 1.640e-07 9.327e-08
15-150 3.016e-07 1.109e-07
Peak spectrum fit
Power-law model
Time interval is from 63.872 sec. to 64.872 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34285 ( -0.395778 0.392188 )
Norm@50keV : 3.87139E-03 ( -0.000864445 0.00085708 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.60 using 59 PHA bins.
# Reduced chi-squared = 0.7474 for 57 degrees of freedom
# Null hypothesis probability = 9.220024e-01
Photon flux (15-150 keV) in 1 sec: 0.465710 ( -0.103005 0.103195 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.78721e-08 ( -9.44982e-09 9.67235e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 63.872 sec. to 64.872 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34714 ( -0.60373 0.389991 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.87729E-03 ( -0.000855841 0.0245665 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.60 using 59 PHA bins.
# Reduced chi-squared = 0.7608 for 56 degrees of freedom
# Null hypothesis probability = 9.064879e-01
Photon flux (15-150 keV) in 1 sec: 0.465920 ( -0.103311 0.102817 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.78579e-08 ( -1.04848e-08 9.6108e-09 ) ergs/cm2
Band function
Time interval is from 63.872 sec. to 64.872 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.612096 ( 0.832385 0.832385 )
beta : -1.46411 ( 1.428 0.471225 )
Epeak [keV] : 69.1809 ( -68.7154 355.054 )
Norm@50keV : 1.07991E-02 ( -0.0109184 355425 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.47 using 59 PHA bins.
# Reduced chi-squared = 0.7722 for 55 degrees of freedom
# Null hypothesis probability = 8.915247e-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] : 14.7275 (-3.84382 6.19516)
R^2/D10^2 : 5.69934E-02 (-0.0396491 0.106129)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.04 using 59 PHA bins.
# Reduced chi-squared = 0.8428 for 57 degrees of freedom
# Null hypothesis probability = 7.951992e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.595e-09 1.248e-09
25- 50 1.014e-08 4.246e-09
50-150 1.484e-08 7.642e-09
15-150 2.758e-08 1.102e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-100.106 -199.363)
Norm : 1.91194 (-0.420157 0.420986)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.47 using 59 PHA bins.
# Reduced chi-squared = 0.7626 for 57 degrees of freedom
# Null hypothesis probability = 9.066778e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.761e-09 2.825e-09
25- 50 9.158e-09 5.370e-09
50-150 2.009e-08 1.163e-08
15-150 3.400e-08 1.995e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.91075 (-4.64522 4.30764)
R1^2/D10^2 : 0.180644 (-0.126131 1.01983)
kT2 [keV] : 83.4959 (-70.3064 -90.8852)
R2^2/D10^2 : 2.90545E-04 (-0.000218347 0.0146627)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.72 using 59 PHA bins.
# Reduced chi-squared = 0.7585 for 55 degrees of freedom
# Null hypothesis probability = 9.066706e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.747e-09 2.278e-09
25- 50 9.986e-09 5.905e-09
50-150 2.496e-08 1.454e-08
15-150 3.869e-08 1.960e-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: 1.71889 ( -0.189532 0.196177 )
Norm@50keV : 1.73852E-03 ( -0.000211846 0.000207553 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.02 using 59 PHA bins.
# Reduced chi-squared = 0.8775 for 57 degrees of freedom
# Null hypothesis probability = 7.321943e-01
Photon flux (15-150 keV) in 19.65 sec: 0.232440 ( -0.0242694 0.0242739 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15854e-07 ( -3.99477e-08 4.07512e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43324 ( -0.755928 0.644967 )
Epeak [keV] : 90.1928 ( -61.8858 -90.1931 )
Norm@50keV : 2.49115E-03 ( -0.000954304 0.00383065 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.48 using 59 PHA bins.
# Reduced chi-squared = 0.8835 for 56 degrees of freedom
# Null hypothesis probability = 7.185180e-01
Photon flux (15-150 keV) in 19.65 sec: 0.229668 ( -0.025061 0.025039 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07198e-07 ( -4.41987e-08 2.25916e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43304 ( -0.501228 0.652628 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 90.1373 ( -40.1122 -90.1373 )
Norm@50keV : 2.49148E-03 ( -0.000940076 0.00383146 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.48 using 59 PHA bins.
# Reduced chi-squared = 0.8996 for 55 degrees of freedom
# Null hypothesis probability = 6.848197e-01
Photon flux (15-150 keV) in 19.65 sec: 0.229162 ( ) 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) = 8.62e-08
S(50-100 keV) = 1.05e-07
T90 vs. Hardness ratio plot
T90 = 17.947999894619 sec.
Hardness ratio (energy fluence ratio) = 1.2181
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.07548
Count Ratio (50-100 keV) / (15-25 keV) = 0.750654
Mask shadow pattern
IMX = 1.806734798416724E-01, IMY = 1.680524423873691E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
-239.000000 47.644000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
296.8180 62.8617 4.2 47.1 -53.2 2.6049 2.8 ------ UNKNOWN
10.6756 72.1211 3.2 40.8 -92.5 3.7693 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
47.644000 67.292000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
153.0105 34.8637 2.4 31.4 115.6 0.3443 4.9 ------ UNKNOWN
175.5694 46.8444 2.7 20.1 74.0 0.2082 4.3 ------ UNKNOWN
195.4753 74.5693 0.7 13.9 -42.9 0.5708 15.6 ------ UNKNOWN
96.0009 52.5609 2.2 34.7 -159.0 0.2472 5.2 ------ UNKNOWN
16.5735 71.4250 2.4 40.9 -95.5 0.8070 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
113.900600 963.090000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3255 35.2542 5.0 48.1 -13.9 1.6396 2.3 8.4 Her X-1
90.1784 41.2650 3.2 54.3 173.1 6.0410 3.7 ------ UNKNOWN
99.3308 63.0376 2.9 32.2 178.5 1.7567 3.9 ------ UNKNOWN
75.1602 41.7605 4.8 57.2 -173.8 5.0668 2.4 ------ UNKNOWN
324.7373 76.3651 3.7 26.2 -99.3 1.5143 3.2 ------ UNKNOWN
62.6971 41.8989 3.5 59.4 -163.2 12.5554 3.3 ------ UNKNOWN
338.8454 62.2142 4.2 41.2 -98.7 7.2904 2.8 ------ UNKNOWN
Plot creation:
Sun May 31 02:06:20 EDT 2015