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
230.491 13.250 0.000 47.016 155.203 1.652 9.258 TRIG_00528195
Image time interval: 0.000 to 64.000 [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 -7.800 sec. to 35.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00898 ( -0.239745 0.258909 )
Norm@50keV : 3.35418E-03 ( -0.000515407 0.000494111 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.25 using 59 PHA bins.
# Reduced chi-squared = 0.7061 for 57 degrees of freedom
# Null hypothesis probability = 9.546918e-01
Photon flux (15-150 keV) in 42.94 sec: 0.505216 ( -0.0618689 0.0620494 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32886e-06 ( -1.87236e-07 1.9021e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.800 sec. to 35.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09201 ( )
Epeak [keV] : 45.0239 ( )
Norm@50keV : 2.93056E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.89 using 59 PHA bins.
# Reduced chi-squared = 0.7123 for 56 degrees of freedom
# Null hypothesis probability = 9.489138e-01
Photon flux (15-150 keV) in 42.94 sec: 0.506417 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32698e-06 ( -1.85376e-07 1.92036e-07 ) ergs/cm2
Band function
Time interval is from -7.800 sec. to 35.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.70660 ( 1.72082 1.72082 )
beta : -2.00186 ( 2.00833 0.238931 )
Epeak [keV] : 15.7695 ( -11.9522 -11.9522 )
Norm@50keV : 6.33728E-03 ( -0.00298965 0.516406 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.25 using 59 PHA bins.
# Reduced chi-squared = 0.7319 for 55 degrees of freedom
# Null hypothesis probability = 9.319912e-01
Photon flux (15-150 keV) in 42.94 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] : 11.0058 (-1.73202 2.02941)
R^2/D10^2 : 0.154442 (-0.0722456 0.140877)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.92 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 57 degrees of freedom
# Null hypothesis probability = 1.731851e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.679e-07 4.047e-08
25- 50 4.750e-07 9.855e-08
50-150 3.251e-07 8.876e-08
15-150 9.680e-07 1.718e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 77.2433 (-26.5416 52.3656)
Norm : 2.34157 (-0.43533 0.558463)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.94 using 59 PHA bins.
# Reduced chi-squared = 0.7708 for 57 degrees of freedom
# Null hypothesis probability = 8.976374e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.603e-07 4.335e-08
25- 50 4.248e-07 5.599e-08
50-150 5.855e-07 2.740e-07
15-150 1.271e-06 2.785e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.45360 (-1.09582 1.59094)
R1^2/D10^2 : 14.1997 (-11.8446 124.13)
kT2 [keV] : 16.6743 (-3.59734 6.31454)
R2^2/D10^2 : 2.73237E-02 (-0.019341 0.0431838)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.85 using 59 PHA bins.
# Reduced chi-squared = 0.7427 for 55 degrees of freedom
# Null hypothesis probability = 9.224003e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.265e-07 1.630e-07
25- 50 3.513e-07 1.234e-07
50-150 5.741e-07 2.345e-07
15-150 1.252e-06 4.099e-07
Peak spectrum fit
Power-law model
Time interval is from 4.236 sec. to 5.236 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50522 ( -0.75956 0.713808 )
Norm@50keV : 7.98326E-03 ( -0.0028958 0.00284587 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.32 using 59 PHA bins.
# Reduced chi-squared = 0.9530 for 57 degrees of freedom
# Null hypothesis probability = 5.761936e-01
Photon flux (15-150 keV) in 1 sec: 0.998038 ( -0.380507 0.381962 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.56683e-08 ( -2.88762e-08 2.92582e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.236 sec. to 5.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.29830 ( )
Epeak [keV] : 109.261 ( )
Norm@50keV : 2.93349E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.30 using 59 PHA bins.
# Reduced chi-squared = 0.9696 for 56 degrees of freedom
# Null hypothesis probability = 5.396116e-01
Photon flux (15-150 keV) in 1 sec: 1.01236 ( -0.39644 0.36955 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.51371e-08 ( -2.83814e-08 2.89579e-08 ) ergs/cm2
Band function
Time interval is from 4.236 sec. to 5.236 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92192 ( -4.92192 -4.92192 )
beta : -1.69357 ( -1.39293 0.849605 )
Epeak [keV] : 27.4739 ( -27.4739 60.6139 )
Norm@50keV : 440.740 ( -154.605 9.20772e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.83 using 59 PHA bins.
# Reduced chi-squared = 0.9787 for 55 degrees of freedom
# Null hypothesis probability = 5.194425e-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] : 8.22985 (-2.80823 54.085)
R^2/D10^2 : 0.952414 (-0.950686 4.20176)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.62 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 57 degrees of freedom
# Null hypothesis probability = 3.806433e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.190e-08 7.390e-09
25- 50 2.187e-08 1.384e-08
50-150 6.298e-09 5.560e-09
15-150 4.007e-08 2.686e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 4.06488 (-1.46001 2.11319)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.83 using 59 PHA bins.
# Reduced chi-squared = 0.9620 for 57 degrees of freedom
# Null hypothesis probability = 5.567684e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.012e-08 6.270e-09
25- 50 1.947e-08 1.231e-08
50-150 4.270e-08 2.759e-08
15-150 7.230e-08 4.547e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.57759 (-2.17516 3.30467)
R1^2/D10^2 : 1.94447 (-1.68392 5.24883)
kT2 [keV] : 56.6915 (-44.4216 -55.6269)
R2^2/D10^2 : 1.55213E-03 (-0.00153779 0.0146793)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.02 using 59 PHA bins.
# Reduced chi-squared = 0.9276 for 55 degrees of freedom
# Null hypothesis probability = 6.274918e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.310e-08 8.885e-09
25- 50 1.892e-08 1.110e-08
50-150 5.216e-08 3.002e-08
15-150 8.419e-08 4.178e-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: 2.00898 ( -0.239745 0.258909 )
Norm@50keV : 3.35418E-03 ( -0.000515407 0.000494111 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.25 using 59 PHA bins.
# Reduced chi-squared = 0.7061 for 57 degrees of freedom
# Null hypothesis probability = 9.546918e-01
Photon flux (15-150 keV) in 42.94 sec: 0.505216 ( -0.0618689 0.0620494 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32886e-06 ( -1.87236e-07 1.9021e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.65988 ( -0.948643 0.283054 )
Epeak [keV] : 227.758 ( )
Norm@50keV : 1.61609E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.76 using 59 PHA bins.
# Reduced chi-squared = 0.6921 for 56 degrees of freedom
# Null hypothesis probability = 9.616377e-01
Photon flux (15-150 keV) in 42.94 sec: 0.506417 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32698e-06 ( -1.85376e-07 1.92036e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.70660 ( 1.72082 1.72082 )
beta : -2.00186 ( 2.00833 0.238931 )
Epeak [keV] : 15.7695 ( -11.9522 -11.9522 )
Norm@50keV : 6.33728E-03 ( -0.00298965 0.516406 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.25 using 59 PHA bins.
# Reduced chi-squared = 0.7319 for 55 degrees of freedom
# Null hypothesis probability = 9.319912e-01
Photon flux (15-150 keV) in 42.94 sec: ( ) 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) = 4.01e-07
S(50-100 keV) = 3.99e-07
T90 vs. Hardness ratio plot
T90 = 36.3200000524521 sec.
Hardness ratio (energy fluence ratio) = 0.995012
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.781621
Count Ratio (50-100 keV) / (15-25 keV) = 0.572592
Mask shadow pattern
IMX = -0.974054834462, IMY = -0.450006032769
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:
-12.099400 -7.800000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4543 35.3811 9.8 22.3 120.1 0.0254 1.2 2.3 Her X-1
299.5059 35.2947 16.6 38.9 50.8 0.0283 0.7 7.0 Cyg X-1
308.2205 40.9608 4.3 39.3 36.7 0.0913 2.7 5.0 Cyg X-3
326.1331 38.2187 14.8 50.8 25.3 -0.0598 -0.8 6.4 Cyg X-2
20.3265 56.6760 2.2 58.7 -22.9 0.5727 5.3 ------ UNKNOWN
177.8232 40.8192 2.3 48.1 -129.8 0.4058 5.1 ------ UNKNOWN
158.5152 65.7558 2.3 40.6 -91.9 0.3656 5.1 ------ UNKNOWN
73.1842 75.4728 2.6 47.0 -53.5 0.3455 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-7.800000 35.144000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3855 35.3453 8.3 22.3 120.3 -0.3121 -1.4 3.5 Her X-1
299.5474 35.1352 19.6 39.0 51.0 0.2560 0.6 4.5 Cyg X-1
308.3102 41.0797 6.9 39.3 36.5 -0.6124 -1.7 11.8 Cyg X-3
326.1927 38.3090 19.5 50.8 25.2 0.4715 0.6 1.2 Cyg X-2
230.4840 13.2394 2.0 47.0 155.2 3.3652 5.9 ------ UNKNOWN
253.7372 58.5891 2.1 1.7 -0.8 0.9972 5.6 ------ UNKNOWN
53.5594 75.5836 1.9 46.4 -46.9 3.4453 6.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
137.100600 963.039500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9792 -15.6443 0.2 32.3 129.1 78.1490 63.9 0.2 Sco X-1
254.4623 35.3413 821.4 30.9 16.2 -0.0114 -0.0 0.2 Her X-1
222.1860 -31.5662 2.9 45.5 165.9 7.1824 4.0 ------ UNKNOWN
256.5198 61.4266 3.5 51.7 -8.6 5.2461 3.4 ------ UNKNOWN
220.6400 25.0616 3.0 15.0 -60.8 2.4585 3.8 ------ UNKNOWN
229.5313 72.1948 3.7 58.9 -24.4 12.8713 3.1 ------ UNKNOWN
184.6086 -1.9002 3.4 48.0 -129.0 9.7815 3.4 ------ UNKNOWN
Plot creation:
Thu Oct 8 20:18:07 EDT 2015