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
219.1227 79.6777 0.0093 19.8523 -28.6161 1.8948941 20.579 TRIG_00517234
Foreground time interval of the image:
-24.752 35.877 (delta_t = 60.629 [sec])
Background time interval of the image:
-239.624 -24.752 (delta_t = 214.872 [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 4.096000
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 4.096000
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 4.096000
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)
The mask-weighted light curves based on cleaned DPHs
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 -24.752 sec. to 58.204 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71877 ( -0.127256 0.13013 )
Norm@50keV : 1.52465E-03 ( -0.000121361 0.000119971 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.07 using 59 PHA bins.
# Reduced chi-squared = 0.9310 for 57 degrees of freedom
# Null hypothesis probability = 6.233013e-01
Photon flux (15-150 keV) in 82.96 sec: 0.203837 ( -0.0142432 0.0142487 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16946e-06 ( -9.73071e-08 9.87249e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.752 sec. to 58.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09529 ( -0.581074 0.507259 )
Epeak [keV] : 65.0351 ( -14.1434 80.5722 )
Norm@50keV : 3.33996E-03 ( -0.00154589 0.00354593 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.52 using 59 PHA bins.
# Reduced chi-squared = 0.8664 for 56 degrees of freedom
# Null hypothesis probability = 7.510014e-01
Photon flux (15-150 keV) in 82.96 sec: 0.197599 ( -0.01505 0.015052 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09457e-06 ( -1.11357e-07 1.14427e-07 ) ergs/cm2
Band function
Time interval is from -24.752 sec. to 58.204 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09523 ( -0.464374 0.634162 )
beta : -10.0000 ( 10 3.55271e-14 )
Epeak [keV] : 65.0213 ( -13.6417 80.5793 )
Norm@50keV : 3.33993E-03 ( -0.00154639 0.00354742 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.52 using 59 PHA bins.
# Reduced chi-squared = 0.8821 for 55 degrees of freedom
# Null hypothesis probability = 7.190834e-01
Photon flux (15-150 keV) in 82.96 sec: 0.198235 ( 6.80176 -0.015286 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0972e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9548 (-1.02471 1.13519)
R^2/D10^2 : 4.95792E-02 (-0.0140073 0.019292)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.89 using 59 PHA bins.
# Reduced chi-squared = 1.454 for 57 degrees of freedom
# Null hypothesis probability = 1.417061e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.243e-07 1.551e-08
25- 50 3.894e-07 3.186e-08
50-150 3.338e-07 5.828e-08
15-150 8.475e-07 7.935e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 120.524 (-32.5286 47.7561)
Norm : 0.858611 (-0.0732317 0.0936415)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.97 using 59 PHA bins.
# Reduced chi-squared = 0.8591 for 57 degrees of freedom
# Null hypothesis probability = 7.665174e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.855e-07 1.896e-08
25- 50 3.321e-07 3.480e-08
50-150 5.940e-07 2.053e-07
15-150 1.112e-06 2.489e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.40582 (-1.52996 1.62001)
R1^2/D10^2 : 0.302923 (-0.155922 0.458649)
kT2 [keV] : 20.9995 (-4.32199 7.45915)
R2^2/D10^2 : 4.71633E-03 (-0.00325737 0.00535439)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.89 using 59 PHA bins.
# Reduced chi-squared = 0.8707 for 55 degrees of freedom
# Null hypothesis probability = 7.406462e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.822e-07 6.262e-08
25- 50 3.391e-07 9.374e-08
50-150 5.711e-07 2.500e-07
15-150 1.092e-06 3.535e-07
Peak spectrum fit
Power-law model
Time interval is from 0.624 sec. to 1.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70676 ( -0.373793 0.40814 )
Norm@50keV : 4.47972E-03 ( -0.00116422 0.00111349 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.96 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 57 degrees of freedom
# Null hypothesis probability = 1.331063e-01
Photon flux (15-150 keV) in 1 sec: 0.596369 ( -0.125691 0.125697 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.14543e-08 ( -1.08931e-08 1.14383e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.624 sec. to 1.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33325 ( -1.9968 1.07333 )
Epeak [keV] : 76.1953 ( -76.3095 -76.3603 )
Norm@50keV : 7.34448E-03 ( -0.00732896 0.10251 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.79 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 56 degrees of freedom
# Null hypothesis probability = 1.172486e-01
Photon flux (15-150 keV) in 1 sec: 0.588398 ( -0.129528 0.129269 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.96455e-08 ( -1.23932e-08 1.28715e-08 ) ergs/cm2
Band function
Time interval is from 0.624 sec. to 1.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.343944 ( -1.80565 -1.80565 )
beta : -1.92370 ( 1.97715 0.612944 )
Epeak [keV] : 33.9180 ( -30.6972 122.971 )
Norm@50keV : 0.114981 ( -0.116014 663.704 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.44 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 55 degrees of freedom
# Null hypothesis probability = 1.052136e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.98196e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.1064 (-2.80628 3.77993)
R^2/D10^2 : 0.192932 (-0.125165 0.360055)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.53 using 59 PHA bins.
# Reduced chi-squared = 1.290 for 57 degrees of freedom
# Null hypothesis probability = 6.928645e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.982e-09 2.133e-09
25- 50 1.426e-08 6.058e-09
50-150 1.001e-08 5.539e-09
15-150 2.925e-08 1.048e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 98.5980 (-48.8101 -99.2774)
Norm : 2.65482 (-0.686269 0.835451)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.85 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 57 degrees of freedom
# Null hypothesis probability = 1.350242e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.939e-09 2.349e-09
25- 50 1.196e-08 6.550e-09
50-150 1.923e-08 1.462e-08
15-150 3.813e-08 2.238e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.03482 (-3.45378 4.99505)
R1^2/D10^2 : 1.16194 (-0.995952 36.8392)
kT2 [keV] : 21.0049 (-9.31065 -21.2093)
R2^2/D10^2 : 1.34769E-02 (-0.0134614 0.119899)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.58 using 59 PHA bins.
# Reduced chi-squared = 1.247 for 55 degrees of freedom
# Null hypothesis probability = 1.030873e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.793e-09 4.117e-09
25- 50 1.150e-08 6.255e-09
50-150 1.953e-08 1.217e-08
15-150 3.782e-08 2.054e-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: 1.59781 ( -0.123422 0.125238 )
Norm@50keV : 1.95645E-03 ( -0.000141397 0.000140132 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.41 using 59 PHA bins.
# Reduced chi-squared = 0.9370 for 57 degrees of freedom
# Null hypothesis probability = 6.105219e-01
Photon flux (15-150 keV) in 60.63 sec: 0.251243 ( -0.0168361 0.016847 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10964e-06 ( -8.72126e-08 8.82609e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35773 ( -0.492457 0.304521 )
Epeak [keV] : 126.802 ( -57.0264 -126.802 )
Norm@50keV : 2.61581E-03 ( -0.000745042 0.00206477 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.57 using 59 PHA bins.
# Reduced chi-squared = 0.9388 for 56 degrees of freedom
# Null hypothesis probability = 6.053853e-01
Photon flux (15-150 keV) in 60.63 sec: 0.247978 ( -0.017856 0.017831 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08304e-06 ( -1.00537e-07 9.86208e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.35837 ( -0.196322 0.531 )
beta : -10.0000 ( 10 1.06581e-14 )
Epeak [keV] : 126.429 ( -56.6899 -126.437 )
Norm@50keV : 2.61616E-03 ( -0.000773834 0.00206462 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.57 using 59 PHA bins.
# Reduced chi-squared = 0.9559 for 55 degrees of freedom
# Null hypothesis probability = 5.679077e-01
Photon flux (15-150 keV) in 60.63 sec: 0.246442 ( ) 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) = 3.19e-07
S(50-100 keV) = 3.88e-07
T90 vs. Hardness ratio plot
T90 = 61.2559999227524 sec.
Hardness ratio (energy fluence ratio) = 1.2163
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.203
Count Ratio (50-100 keV) / (15-25 keV) = 0.752346
Mask shadow pattern
IMX = 3.169507521572804E-01, IMY = 1.729227277776173E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.624000 -24.752000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
119.5113 29.0995 2.9 43.4 160.5 3.1401 4.1 ------ UNKNOWN
181.6244 64.0018 3.3 13.7 37.3 1.0944 3.5 ------ UNKNOWN
273.5135 47.6238 3.4 56.4 -16.5 4.0004 3.4 ------ UNKNOWN
42.9076 71.6806 2.4 31.2 -94.0 2.1690 4.7 ------ UNKNOWN
348.6917 67.7828 3.4 42.5 -69.2 4.8346 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-24.752000 35.876600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
108.8372 29.2816 1.8 46.0 173.2 1.2152 6.4 ------ UNKNOWN
229.5714 61.6525 2.2 31.8 4.3 0.5931 5.2 ------ UNKNOWN
219.1226 79.6777 0.6 19.9 -28.6 1.8951 20.6 ------ UNKNOWN
264.3770 43.0810 2.7 58.3 -7.4 2.3159 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
81.076600 962.389400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5862 35.3309 20.2 46.5 -1.7 -0.5422 -0.6 6.3 Her X-1
244.1700 26.7860 3.2 54.0 11.1 6.3867 3.6 ------ UNKNOWN
128.2402 74.0845 2.7 19.0 161.8 1.8933 4.3 ------ UNKNOWN
40.5183 47.1049 2.9 53.2 -142.2 10.8523 3.9 ------ UNKNOWN
24.5181 52.1135 2.5 47.9 -129.0 9.6344 4.6 ------ UNKNOWN
Plot creation:
Sat May 30 20:08:18 EDT 2015