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
189.0834 32.9802 0.0136 38.8964 28.2235 0.3440087 14.096 TRIG_00350479
Foreground time interval of the image:
-0.032 1.340 (delta_t = 1.372 [sec])
Background time interval of the image:
-239.904 -0.032 (delta_t = 239.872 [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 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 -0.032 sec. to 1.340 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83746 ( -0.206817 0.21819 )
Norm@50keV : 1.46422E-02 ( -0.00211033 0.00206677 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.93 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.408899e-01
Photon flux (15-150 keV) in 1.372 sec: 2.04772 ( -0.255475 0.25559 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.84755e-07 ( -2.64703e-08 2.68664e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 1.340 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10545 ( -0.994946 0.800795 )
Epeak [keV] : 55.0858 ( -16.1878 -55.0858 )
Norm@50keV : 3.71705E-02 ( -0.0231994 0.094306 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.50 using 59 PHA bins.
# Reduced chi-squared = 0.9912 for 56 degrees of freedom
# Null hypothesis probability = 4.935501e-01
Photon flux (15-150 keV) in 1.372 sec: 2.00810 ( -0.25931 0.2593 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75643e-07 ( -2.81562e-08 2.87736e-08 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 1.340 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.74962 ( -4.40254 -4.74962 )
beta : -2.03940 ( -0.321774 0.264823 )
Epeak [keV] : 25.3425 ( -5.78759 4.43099 )
Norm@50keV : 1287.73 ( -158.168 23613.7 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.69 using 59 PHA bins.
# Reduced chi-squared = 0.9944 for 55 degrees of freedom
# Null hypothesis probability = 4.863403e-01
Photon flux (15-150 keV) in 1.372 sec: 2.02498 ( 4.97502 -0.28107 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75661e-07 ( -1.75652e-07 -2.83277e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.5190 (-1.7064 1.94753)
R^2/D10^2 : 0.582864 (-0.256129 0.469869)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.67 using 59 PHA bins.
# Reduced chi-squared = 1.205 for 57 degrees of freedom
# Null hypothesis probability = 1.382947e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.234e-08 5.323e-09
25- 50 6.694e-08 1.230e-08
50-150 5.192e-08 1.595e-08
15-150 1.412e-07 2.317e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 91.1180 (-30.1929 60.0926)
Norm : 9.36136 (-1.52733 1.88009)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.63 using 59 PHA bins.
# Reduced chi-squared = 0.9759 for 57 degrees of freedom
# Null hypothesis probability = 5.267537e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.352e-08 5.989e-09
25- 50 5.685e-08 7.793e-09
50-150 8.723e-08 4.145e-08
15-150 1.776e-07 4.628e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.84073 (-1.82579 2.47983)
R1^2/D10^2 : 4.63585 (-3.21903 14.3077)
kT2 [keV] : 19.4121 (-5.15513 11.8693)
R2^2/D10^2 : 6.09542E-02 (-0.0518705 0.158029)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.46 using 59 PHA bins.
# Reduced chi-squared = 0.9901 for 55 degrees of freedom
# Null hypothesis probability = 4.953933e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.385e-08 1.824e-08
25- 50 5.605e-08 2.644e-08
50-150 8.556e-08 4.982e-08
15-150 1.755e-07 9.090e-08
Peak spectrum fit
Power-law model
Time interval is from -0.034 sec. to 0.966 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73956 ( -0.217348 0.226995 )
Norm@50keV : 1.69291E-02 ( -0.00249655 0.00245338 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.72 using 59 PHA bins.
# Reduced chi-squared = 0.9775 for 57 degrees of freedom
# Null hypothesis probability = 5.233018e-01
Photon flux (15-150 keV) in 1 sec: 2.28036 ( -0.306239 0.306441 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.56308e-07 ( -2.36143e-08 2.39034e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.034 sec. to 0.966 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16136 ( -1.0196 0.727131 )
Epeak [keV] : 67.2230 ( -22.2942 -67.223 )
Norm@50keV : 3.49521E-02 ( -0.0197253 0.0899563 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.30 using 59 PHA bins.
# Reduced chi-squared = 0.9697 for 56 degrees of freedom
# Null hypothesis probability = 5.394361e-01
Photon flux (15-150 keV) in 1 sec: 2.24918 ( -0.30995 0.30984 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50532e-07 ( -2.5408e-08 2.5503e-08 ) ergs/cm2
Band function
Time interval is from -0.034 sec. to 0.966 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.16112 ( -0.529003 1.01932 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 67.2037 ( -22.2469 -67.2037 )
Norm@50keV : 3.49582E-02 ( -0.0197351 0.0900021 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.30 using 59 PHA bins.
# Reduced chi-squared = 0.9873 for 55 degrees of freedom
# Null hypothesis probability = 5.013104e-01
Photon flux (15-150 keV) in 1 sec: 2.25797 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.52073e-07 ( -1.52066e-07 -2.3882e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.1000 (-1.93772 2.28043)
R^2/D10^2 : 0.549059 (-0.257584 0.488952)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.98 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.718761e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.701e-08 4.010e-09
25- 50 5.407e-08 1.018e-08
50-150 4.786e-08 1.500e-08
15-150 1.189e-07 2.146e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 117.341 (-45.3154 -116.261)
Norm : 9.80230 (-1.48108 2.01834)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.33 using 59 PHA bins.
# Reduced chi-squared = 0.9532 for 57 degrees of freedom
# Null hypothesis probability = 5.757645e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.555e-08 4.690e-09
25- 50 4.554e-08 7.790e-09
50-150 8.036e-08 4.752e-08
15-150 1.514e-07 5.597e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.63600 (-2.10977 2.70247)
R1^2/D10^2 : 3.37387 (-2.27107 9.67256)
kT2 [keV] : 23.3739 (-7.44896 22.5526)
R2^2/D10^2 : 3.46687E-02 (-0.0313891 0.12682)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.13 using 59 PHA bins.
# Reduced chi-squared = 0.9660 for 55 degrees of freedom
# Null hypothesis probability = 5.464331e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.591e-08 1.398e-08
25- 50 4.637e-08 2.115e-08
50-150 7.980e-08 4.513e-08
15-150 1.521e-07 7.957e-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: 1.83746 ( -0.206817 0.21819 )
Norm@50keV : 1.46422E-02 ( -0.00211033 0.00206677 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.93 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.408899e-01
Photon flux (15-150 keV) in 1.372 sec: 2.04772 ( -0.255475 0.25559 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.84755e-07 ( -2.64703e-08 2.68664e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10545 ( -0.994946 0.800795 )
Epeak [keV] : 55.0858 ( -16.1878 -55.0858 )
Norm@50keV : 3.71705E-02 ( -0.0231994 0.094306 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.50 using 59 PHA bins.
# Reduced chi-squared = 0.9912 for 56 degrees of freedom
# Null hypothesis probability = 4.935501e-01
Photon flux (15-150 keV) in 1.372 sec: 2.00810 ( -0.25931 0.2593 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75643e-07 ( -2.81562e-08 2.87736e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.74962 ( -12.6323 -4.74962 )
beta : -2.03940 ( -0.321774 0.264823 )
Epeak [keV] : 25.3425 ( -5.78759 4.43099 )
Norm@50keV : 1287.73 ( -158.168 23613.7 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.69 using 59 PHA bins.
# Reduced chi-squared = 0.9944 for 55 degrees of freedom
# Null hypothesis probability = 4.863403e-01
Photon flux (15-150 keV) in 1.372 sec: 2.02498 ( 4.97502 -0.28107 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75661e-07 ( -1.75652e-07 -2.83277e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 5.27e-08
S(50-100 keV) = 5.90e-08
T90 vs. Hardness ratio plot
T90 = 1.23600003123283 sec.
Hardness ratio (energy fluence ratio) = 1.11954
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.30684
Count Ratio (50-100 keV) / (15-25 keV) = 0.732528
Mask shadow pattern
IMX = 7.108730119739337E-01, IMY = -3.815428311607643E-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:
-239.904000 -0.032000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
133.1367 -10.3649 2.3 32.5 178.3 1.0413 5.1 ------ UNKNOWN
104.8969 -13.4965 2.9 53.7 -154.6 2.3249 4.0 ------ UNKNOWN
158.0651 74.2301 2.8 56.3 -28.4 3.7963 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.032000 1.340000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
189.0834 32.9802 0.8 38.9 28.2 0.3440 14.1 ------ UNKNOWN
182.9527 32.3341 2.7 33.7 27.1 0.0776 4.3 ------ UNKNOWN
203.8707 54.1126 1.8 55.1 4.4 0.4716 6.4 ------ UNKNOWN
142.9067 63.5257 2.1 45.5 -35.1 0.1269 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
68.796600 962.157500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4208 35.4359 7.0 53.1 9.3 3.0659 1.7 5.9 Her X-1
188.3766 -9.7607 2.4 42.7 122.4 7.6559 4.7 ------ UNKNOWN
165.3073 -8.0726 2.4 46.9 154.6 6.0724 4.7 ------ UNKNOWN
151.3480 -4.5691 2.3 51.8 172.3 6.9303 4.9 ------ UNKNOWN
162.5275 7.2964 2.8 35.6 171.1 2.2626 4.0 ------ UNKNOWN
166.9797 22.5225 3.1 22.1 -171.2 1.4529 3.7 ------ UNKNOWN
135.3695 5.7812 2.9 56.7 -165.0 7.0031 3.9 ------ UNKNOWN
210.9958 79.0908 5.0 47.0 -53.1 5.1969 2.3 ------ UNKNOWN
Plot creation:
Sun May 31 04:15:22 EDT 2015