Special notes of this burst
Image
Pre-slew 15.0-50.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name
0.234 44.602 0.000 22.856 -40.158 2.335 5.570 TRIG_00441015
Image time interval: 0.000 to 963.064 [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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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 -179.000 sec. to 963.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83102 ( -0.298458 0.318958 )
Norm@50keV : 1.99768E-04 ( -4.27465e-05 4.14519e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.18 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 57 degrees of freedom
# Null hypothesis probability = 2.672909e-01
Photon flux (15-150 keV) in 1142 sec: 2.78657E-02 ( -0.004623 0.00462371 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09833e-06 ( -4.38576e-07 4.60279e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -179.000 sec. to 963.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45006 ( -1.35004 0.756084 )
Epeak [keV] : 57.0115 ( -49.4957 -57.0047 )
Norm@50keV : 3.39593E-04 ( -0.000339806 0.00212735 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.76 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 56 degrees of freedom
# Null hypothesis probability = 2.492574e-01
Photon flux (15-150 keV) in 1142 sec: 2.74621E-02 ( -0.0047102 0.0046858 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98449e-06 ( -5.14962e-07 5.36649e-07 ) ergs/cm2
Band function
Time interval is from -179.000 sec. to 963.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.44260 ( -1.6339 1.33348 )
beta : -10.0000 ( 10 1.77636e-14 )
Epeak [keV] : 56.7401 ( -42.9561 -56.7401 )
Norm@50keV : 3.42881E-04 ( -0.000181873 0.00213728 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.76 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 55 degrees of freedom
# Null hypothesis probability = 2.205685e-01
Photon flux (15-150 keV) in 1142 sec: 2.75334E-02 ( 6.97247 -0.0046052 ) 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] : 8.42841 (-1.57686 2.26888)
R^2/D10^2 : 2.47287E-02 (-0.0147585 0.0305975)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.19 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 57 degrees of freedom
# Null hypothesis probability = 1.125837e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.761e-07 1.153e-07
25- 50 7.192e-07 2.168e-07
50-150 2.235e-07 1.122e-07
15-150 1.319e-06 4.236e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 82.6248 (-37.0232 111.495)
Norm : 0.129985 (-0.0283316 0.0396036)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.76 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 57 degrees of freedom
# Null hypothesis probability = 2.793904e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.859e-07 8.491e-08
25- 50 6.402e-07 2.060e-07
50-150 9.233e-07 6.327e-07
15-150 1.949e-06 6.718e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.10006 (-1.35055 1.6251)
R1^2/D10^2 : 6.82832E-02 (-0.0401538 0.0656178)
kT2 [keV] : 26.8373 (-20.1185 30.4199)
R2^2/D10^2 : 2.50686E-04 (-0.000219751 0.00105791)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.05 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 55 degrees of freedom
# Null hypothesis probability = 3.635293e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.291e-07 2.411e-07
25- 50 6.103e-07 3.264e-07
50-150 1.106e-06 6.441e-07
15-150 2.146e-06 1.119e-06
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 963.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69441 ( -0.297652 0.310971 )
Norm@50keV : 2.19502E-04 ( -4.38735e-05 4.26077e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.89 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 57 degrees of freedom
# Null hypothesis probability = 2.472895e-01
Photon flux (15-150 keV) in 963.1 sec: 2.90955E-02 ( -0.00485824 0.00485824 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95816e-06 ( -4.029e-07 4.19742e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 963.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45551 ( -1.1434 0.531532 )
Epeak [keV] : 95.5340 ( -96.2034 -96.2034 )
Norm@50keV : 3.02455E-04 ( -0.000301012 0.00114625 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.70 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 56 degrees of freedom
# Null hypothesis probability = 2.238161e-01
Photon flux (15-150 keV) in 963.1 sec: 2.88203E-02 ( -0.0049543 0.0049589 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89571e-06 ( -4.68847e-07 4.66603e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 963.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46801 ( -1.52168 0.832913 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 97.0623 ( -59.9339 -97.0772 )
Norm@50keV : 2.98385E-04 ( -0.000116106 0.00114967 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.70 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 55 degrees of freedom
# Null hypothesis probability = 1.969422e-01
Photon flux (15-150 keV) in 963.1 sec: 2.87877E-02 ( ) 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] : 9.07660 (-1.83965 3.00179)
R^2/D10^2 : 1.92455E-02 (-0.0191522 0.0265295)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.65 using 59 PHA bins.
# Reduced chi-squared = 1.292 for 57 degrees of freedom
# Null hypothesis probability = 6.804322e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.986e-07 1.104e-07
25- 50 6.431e-07 1.850e-07
50-150 2.518e-07 1.189e-07
15-150 1.193e-06 3.432e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 120.251 (-60.2382 -119.604)
Norm : 0.124052 (-0.0236127 0.0339645)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.75 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 57 degrees of freedom
# Null hypothesis probability = 2.511583e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.112e-07 1.654e-07
25- 50 5.569e-07 3.117e-07
50-150 9.948e-07 6.756e-07
15-150 1.863e-06 1.140e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.25199 (-1.33484 1.64916)
R1^2/D10^2 : 6.18795E-02 (-0.0367731 0.0935695)
kT2 [keV] : 29.5546 (-10.3696 29.9862)
R2^2/D10^2 : 2.19826E-04 (-0.000190559 0.000394944)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.22 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 55 degrees of freedom
# Null hypothesis probability = 3.577186e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.568e-07 1.975e-07
25- 50 5.358e-07 2.861e-07
50-150 1.149e-06 6.568e-07
15-150 2.042e-06 1.042e-06
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: 1.69441 ( -0.297652 0.310971 )
Norm@50keV : 2.19502E-04 ( -4.38735e-05 4.26077e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.89 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 57 degrees of freedom
# Null hypothesis probability = 2.472895e-01
Photon flux (15-150 keV) in 963.1 sec: 2.90955E-02 ( -0.00485824 0.00485824 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95816e-06 ( -4.029e-07 4.19742e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45551 ( -1.1434 0.531532 )
Epeak [keV] : 95.5340 ( -96.2034 -96.2034 )
Norm@50keV : 3.02455E-04 ( -0.000301012 0.00114625 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.70 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 56 degrees of freedom
# Null hypothesis probability = 2.238161e-01
Photon flux (15-150 keV) in 963.1 sec: 2.88203E-02 ( -0.0049543 0.0049589 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89571e-06 ( -4.68847e-07 4.66603e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46801 ( -1.52168 0.832913 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 97.0623 ( -59.9339 -97.0772 )
Norm@50keV : 2.98385E-04 ( -0.000116106 0.00114967 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.70 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 55 degrees of freedom
# Null hypothesis probability = 1.969422e-01
Photon flux (15-150 keV) in 963.1 sec: 2.87877E-02 ( ) 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) = 5.98e-07
S(50-100 keV) = 6.72e-07
T90 vs. Hardness ratio plot
T90 = 1088 sec.
Hardness ratio (energy fluence ratio) = 1.12375
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.979953
Count Ratio (50-100 keV) / (15-25 keV) = 0.828998
Mask shadow pattern
IMX = 0.322152438849, IMY = 0.271833595844
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.000000 963.063800
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
54.9543 -7.2856 3.0 48.6 142.4 11.2160 3.8 ------ UNKNOWN
52.7551 25.7496 2.8 26.2 99.8 3.5990 4.1 ------ UNKNOWN
26.5456 53.1976 2.6 22.5 10.9 2.4137 4.4 ------ UNKNOWN
0.2580 44.6124 2.4 22.8 -40.1 3.0309 4.8 ------ UNKNOWN
346.6273 46.8687 2.7 32.5 -43.6 3.2000 4.4 ------ UNKNOWN
298.4431 70.1671 2.5 59.6 -17.0 17.8011 4.5 ------ UNKNOWN
317.1990 49.9788 4.0 52.1 -42.1 10.0765 2.9 ------ UNKNOWN
352.0292 -7.0557 3.2 48.3 -130.1 10.0968 3.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
Plot creation:
Thu Nov 12 13:18:50 EST 2015