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
32.3186 -67.9914 0.0159 6.8226 -4.3614 0.3437399 12.087 TRIG_00416115
Foreground time interval of the image:
-3.028 6.904 (delta_t = 9.932 [sec])
Background time interval of the image:
-239.120 -3.028 (delta_t = 236.092 [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)
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 -3.028 sec. to 6.904 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56987 ( -0.254157 0.263145 )
Norm@50keV : 1.95225E-03 ( -0.000301761 0.000294819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.05 using 59 PHA bins.
# Reduced chi-squared = 0.8606 for 57 degrees of freedom
# Null hypothesis probability = 7.638575e-01
Photon flux (15-150 keV) in 9.932 sec: 0.248589 ( -0.0346267 0.0346418 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82036e-07 ( -3.04892e-08 3.1195e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.028 sec. to 6.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56781 ( -0.911164 0.350472 )
Epeak [keV] : 9995.67 ( )
Norm@50keV : 1.95729E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.05 using 59 PHA bins.
# Reduced chi-squared = 0.8760 for 56 degrees of freedom
# Null hypothesis probability = 7.330188e-01
Photon flux (15-150 keV) in 9.932 sec: 0.248520 ( -0.035184 0.034606 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82074e-07 ( -3.36278e-08 3.09243e-08 ) ergs/cm2
Band function
Time interval is from -3.028 sec. to 6.904 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34234 ( 1.34234 1.34234 )
beta : -1.56987 ( 1.56987 0.254227 )
Epeak [keV] : 30.7682 ( -30.7682 -30.7682 )
Norm@50keV : 3.48506E-03 ( -0.00180577 0.0773838 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.05 using 59 PHA bins.
# Reduced chi-squared = 0.8919 for 55 degrees of freedom
# Null hypothesis probability = 7.000853e-01
Photon flux (15-150 keV) in 9.932 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] : 13.7366 (-2.52961 3.19085)
R^2/D10^2 : 3.71266E-02 (-0.0191569 0.039001)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.61 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 57 degrees of freedom
# Null hypothesis probability = 2.279855e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.472e-08 4.427e-09
25- 50 5.372e-08 1.073e-08
50-150 6.608e-08 2.200e-08
15-150 1.345e-07 2.996e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 198.394 (-103.361 -198.355)
Norm : 1.00941 (-0.140497 0.164382)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.41 using 59 PHA bins.
# Reduced chi-squared = 0.8669 for 57 degrees of freedom
# Null hypothesis probability = 7.522022e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.498e-08 1.383e-08
25- 50 4.803e-08 2.651e-08
50-150 1.052e-07 5.761e-08
15-150 1.782e-07 9.957e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.12294 (-2.08448 3.1771)
R1^2/D10^2 : 0.834020 (-0.675746 8.04831)
kT2 [keV] : 22.3926 (-6.23152 17.0074)
R2^2/D10^2 : 5.71420E-03 (-0.00486592 0.0129414)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.32 using 59 PHA bins.
# Reduced chi-squared = 0.8967 for 55 degrees of freedom
# Null hypothesis probability = 6.906292e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.740e-08 1.497e-08
25- 50 4.328e-08 2.094e-08
50-150 1.053e-07 6.127e-08
15-150 1.760e-07 9.296e-08
Peak spectrum fit
Power-law model
Time interval is from 2.116 sec. to 3.116 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.979470 ( -0.563136 0.506402 )
Norm@50keV : 3.31094E-03 ( -0.000933966 0.000904442 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.82 using 59 PHA bins.
# Reduced chi-squared = 0.9969 for 57 degrees of freedom
# Null hypothesis probability = 4.817309e-01
Photon flux (15-150 keV) in 1 sec: 0.380909 ( -0.106812 0.107574 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6061e-08 ( -1.03453e-08 1.04801e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.116 sec. to 3.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.75459 ( )
Epeak [keV] : 221.838 ( )
Norm@50keV : 3.55605E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.19 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 56 degrees of freedom
# Null hypothesis probability = 4.678955e-01
Photon flux (15-150 keV) in 1 sec: 0.380700 ( -0.107005 0.107582 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.59575e-08 ( -1.03944e-08 1.05291e-08 ) ergs/cm2
Band function
Time interval is from 2.116 sec. to 3.116 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.875357 ( 0.875339 0.875339 )
beta : -0.979496 ( -0.507299 0.563217 )
Epeak [keV] : 20.4007 ( -20.3455 -20.3455 )
Norm@50keV : 5.16821E-03 ( -0.00274381 0.567752 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.82 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 55 degrees of freedom
# Null hypothesis probability = 4.069973e-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] : 22.8116 (-6.77068 13.8006)
R^2/D10^2 : 1.20380E-02 (-0.012038 0.0254979)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.97 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 57 degrees of freedom
# Null hypothesis probability = 4.033946e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.140e-09 7.380e-10
25- 50 6.155e-09 3.703e-09
50-150 2.393e-08 1.520e-08
15-150 3.122e-08 1.725e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.57534 (-0.441807 0.441774)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.68 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 57 degrees of freedom
# Null hypothesis probability = 3.448548e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.925e-09 2.411e-09
25- 50 7.551e-09 4.639e-09
50-150 1.656e-08 1.006e-08
15-150 2.803e-08 1.695e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.84048 (-1.38997 2.20905)
R1^2/D10^2 : 478.337 (-425.202 8147.81)
kT2 [keV] : 25.6924 (-8.06399 19.4224)
R2^2/D10^2 : 8.04386E-03 (-0.00635556 0.0169479)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.48 using 59 PHA bins.
# Reduced chi-squared = 0.9723 for 55 degrees of freedom
# Null hypothesis probability = 5.329828e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.969e-09 1.302e-09
25- 50 5.264e-09 3.103e-09
50-150 2.548e-08 1.562e-08
15-150 3.371e-08 1.915e-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: 1.56987 ( -0.254157 0.263145 )
Norm@50keV : 1.95225E-03 ( -0.000301761 0.000294819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.05 using 59 PHA bins.
# Reduced chi-squared = 0.8606 for 57 degrees of freedom
# Null hypothesis probability = 7.638575e-01
Photon flux (15-150 keV) in 9.932 sec: 0.248589 ( -0.0346267 0.0346418 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82036e-07 ( -3.04892e-08 3.1195e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56781 ( -0.911164 0.350472 )
Epeak [keV] : 9995.67 ( )
Norm@50keV : 1.95729E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.05 using 59 PHA bins.
# Reduced chi-squared = 0.8760 for 56 degrees of freedom
# Null hypothesis probability = 7.330188e-01
Photon flux (15-150 keV) in 9.932 sec: 0.248520 ( -0.035184 0.034606 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82074e-07 ( -3.36278e-08 3.09243e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34234 ( 1.34234 1.34234 )
beta : -1.56987 ( 1.56987 0.254227 )
Epeak [keV] : 30.7682 ( -30.7682 -30.7682 )
Norm@50keV : 3.48506E-03 ( -0.00180577 0.0773766 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.05 using 59 PHA bins.
# Reduced chi-squared = 0.8919 for 55 degrees of freedom
# Null hypothesis probability = 7.000853e-01
Photon flux (15-150 keV) in 9.932 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) = 4.65e-08
S(50-100 keV) = 6.27e-08
T90 vs. Hardness ratio plot
T90 = 9.26799994707108 sec.
Hardness ratio (energy fluence ratio) = 1.34839
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.08995
Count Ratio (50-100 keV) / (15-25 keV) = 0.932094
Mask shadow pattern
IMX = 1.192961137551998E-01, IMY = 9.098437706870487E-03
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:
-239.120000 -3.028000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
264.8028 -44.4388 7.1 54.1 168.9 -1.2444 -1.6 2.7 4U 1735-44
255.6870 -48.8281 1.9 52.2 159.7 4.4574 5.9 ------ UNKNOWN
310.3118 -30.1882 2.4 54.0 -143.3 5.6476 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-3.028000 6.904000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
264.6211 -44.5714 4.3 54.1 168.7 -0.3890 -2.7 9.0 4U 1735-44
111.9779 -49.4695 2.3 45.4 48.5 0.6589 5.1 ------ UNKNOWN
164.4811 -70.7454 2.1 35.8 96.5 0.4040 5.5 ------ UNKNOWN
32.3186 -67.9914 1.0 6.8 -4.4 0.3437 12.1 ------ UNKNOWN
59.2283 -36.4748 2.5 41.7 -10.5 0.1977 4.6 ------ UNKNOWN
47.5823 -42.3193 2.6 33.4 -21.7 0.1500 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
62.380610 902.901200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
165.0684 -68.2340 2.6 39.9 103.9 6.9342 4.4 ------ UNKNOWN
115.7255 -59.7060 3.2 34.7 67.3 3.4829 3.7 ------ UNKNOWN
63.3972 -38.7037 2.5 33.9 -4.7 2.7878 4.7 ------ UNKNOWN
28.5788 -53.8672 2.8 14.2 -60.0 1.8325 4.1 ------ UNKNOWN
337.7058 -45.7524 3.3 35.4 -130.4 2.6511 3.5 ------ UNKNOWN
357.3838 -42.6524 2.9 31.3 -105.1 2.8968 4.0 ------ UNKNOWN
Plot creation:
Sun May 31 01:57:47 EDT 2015