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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
242.6631 30.2617 0.0073 26.3703 91.6197 2.3953797 26.329 TRIG_00279935
Foreground time interval of the image:
-14.540 13.069 (delta_t = 27.609 [sec])
Background time interval of the image:
-98.531 -14.540 (delta_t = 83.991 [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 1.024000
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 1.024000
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 1.024000
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 -14.540 sec. to 49.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32799 ( -0.036685 0.0365993 )
Norm@50keV : 1.30047E-02 ( -0.000253416 0.000253279 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.69 using 59 PHA bins.
# Reduced chi-squared = 0.7841 for 57 degrees of freedom
# Null hypothesis probability = 8.818563e-01
Photon flux (15-150 keV) in 64.27 sec: 1.55977 ( -0.0340272 0.0341235 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.20439e-06 ( -1.63557e-07 1.63656e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.540 sec. to 49.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10835 ( -0.152038 0.147153 )
Epeak [keV] : 237.678 ( -72.8928 332.071 )
Norm@50keV : 1.61597E-02 ( -0.00213879 0.00254565 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.13 using 59 PHA bins.
# Reduced chi-squared = 0.6809 for 56 degrees of freedom
# Null hypothesis probability = 9.675692e-01
Photon flux (15-150 keV) in 64.27 sec: 1.53377 ( -0.03765 0.03783 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.11042e-06 ( -1.77257e-07 1.76485e-07 ) ergs/cm2
Band function
Time interval is from -14.540 sec. to 49.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.349340 ( -0.581358 1.96204 )
beta : -1.39398 ( -0.167012 0.0568305 )
Epeak [keV] : 62.8009 ( -35.6704 166.454 )
Norm@50keV : 4.82571E-02 ( -0.0302859 0.687728 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.14 using 59 PHA bins.
# Reduced chi-squared = 0.6389 for 55 degrees of freedom
# Null hypothesis probability = 9.830286e-01
Photon flux (15-150 keV) in 64.27 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] : 19.4179 ( )
R^2/D10^2 : 7.41767E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 501.87 using 59 PHA bins.
# Reduced chi-squared = 8.8047 for 57 degrees of freedom
# Null hypothesis probability = 1.997683e-72
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.505e-07 1.504e-08
25- 50 1.712e-06 5.174e-08
50-150 4.762e-06 1.523e-07
15-150 6.824e-06 1.446e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 6.64994 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 179.85 using 59 PHA bins.
# Reduced chi-squared = 3.1552 for 57 degrees of freedom
# Null hypothesis probability = 1.188613e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.064e-06 2.282e-08
25- 50 2.047e-06 4.499e-08
50-150 4.490e-06 9.833e-08
15-150 7.601e-06 1.607e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.51793 (-0.6825 0.727957)
R1^2/D10^2 : 0.717940 (-0.161998 0.223875)
kT2 [keV] : 32.2545 (-2.50415 3.21433)
R2^2/D10^2 : 1.10993E-02 (-0.00305423 0.00361649)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.12 using 59 PHA bins.
# Reduced chi-squared = 0.7477 for 55 degrees of freedom
# Null hypothesis probability = 9.176021e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.427e-07 6.009e-08
25- 50 1.933e-06 7.712e-08
50-150 5.407e-06 2.584e-07
15-150 8.083e-06 3.278e-07
Peak spectrum fit
Power-law model
Time interval is from 30.484 sec. to 31.484 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.994289 ( -0.0656374 0.0651752 )
Norm@50keV : 5.71265E-02 ( -0.00220235 0.00220021 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.88 using 59 PHA bins.
# Reduced chi-squared = 1.349 for 57 degrees of freedom
# Null hypothesis probability = 4.076938e-02
Photon flux (15-150 keV) in 1 sec: 6.57509 ( -0.25739 0.257365 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.18933e-07 ( -2.5692e-08 2.58652e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 30.484 sec. to 31.484 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.528335 ( -0.279997 0.263866 )
Epeak [keV] : 184.342 ( -47.8204 155.299 )
Norm@50keV : 9.16131E-02 ( -0.020974 0.0288954 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.39 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 56 degrees of freedom
# Null hypothesis probability = 1.416438e-01
Photon flux (15-150 keV) in 1 sec: 6.46678 ( -0.26391 0.26414 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.08587e-07 ( -2.7053e-08 2.6947e-08 ) ergs/cm2
Band function
Time interval is from 30.484 sec. to 31.484 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.98157 ( 0.822496 1.98157 )
beta : -0.994304 ( -0.0651555 0.065667 )
Epeak [keV] : 9999.30 ( -9999.36 -9999.36 )
Norm@50keV : 5.71271E-02 ( 0.822496 -0.0571271 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.88 using 59 PHA bins.
# Reduced chi-squared = 1.398 for 55 degrees of freedom
# Null hypothesis probability = 2.732016e-02
Photon flux (15-150 keV) in 1 sec: 6.40345 ( ) 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] : 22.1632 ( )
R^2/D10^2 : 0.233934 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 156.38 using 59 PHA bins.
# Reduced chi-squared = 2.7435 for 57 degrees of freedom
# Null hypothesis probability = 3.383365e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.119e-08 1.675e-09
25- 50 1.126e-07 6.150e-09
50-150 4.132e-07 2.500e-08
15-150 5.469e-07 2.475e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 26.5389 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 263.78 using 59 PHA bins.
# Reduced chi-squared = 4.6277 for 57 degrees of freedom
# Null hypothesis probability = 2.337952e-28
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.608e-08 2.590e-09
25- 50 1.271e-07 5.600e-09
50-150 2.788e-07 1.125e-08
15-150 4.720e-07 1.930e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.85303 (-1.51162 1.69041)
R1^2/D10^2 : 1.53439 (-0.517488 0.894417)
kT2 [keV] : 36.4844 (-5.11239 8.43017)
R2^2/D10^2 : 4.04404E-02 (-0.0193179 0.0255051)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.63 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 55 degrees of freedom
# Null hypothesis probability = 2.238779e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.759e-08 5.775e-09
25- 50 1.226e-07 1.652e-08
50-150 4.538e-07 9.095e-08
15-150 6.139e-07 1.037e-07
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: 1.64975 ( -0.0997224 0.100736 )
Norm@50keV : 5.43875E-03 ( -0.000316238 0.000314469 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.56 using 59 PHA bins.
# Reduced chi-squared = 0.7291 for 57 degrees of freedom
# Null hypothesis probability = 9.380507e-01
Photon flux (15-150 keV) in 27.61 sec: 0.710108 ( -0.0398592 0.0399115 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39662e-06 ( -8.64099e-08 8.70088e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33155 ( -0.424141 0.358969 )
Epeak [keV] : 100.438 ( -33.1862 -100.438 )
Norm@50keV : 7.96829E-03 ( -0.00268581 0.00514852 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.59 using 59 PHA bins.
# Reduced chi-squared = 0.7069 for 56 degrees of freedom
# Null hypothesis probability = 9.525814e-01
Photon flux (15-150 keV) in 27.61 sec: 0.697993 ( -0.042421 0.042389 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35627e-06 ( -9.99344e-08 9.98184e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.677307 ( -0.883906 0.844753 )
beta : -1.79041 ( 1.78499 0.172896 )
Epeak [keV] : 47.8959 ( -25.361 110.953 )
Norm@50keV : 2.17136E-02 ( -0.0219588 359.346 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.58 using 59 PHA bins.
# Reduced chi-squared = 0.7014 for 55 degrees of freedom
# Null hypothesis probability = 9.545887e-01
Photon flux (15-150 keV) in 27.61 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36194e-06 ( -1.36174e-06 -9.26868e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.85e-06
S(50-100 keV) = 2.96e-06
T90 vs. Hardness ratio plot
T90 = 38.6279999911785 sec.
Hardness ratio (energy fluence ratio) = 1.6
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.63573
Count Ratio (50-100 keV) / (15-25 keV) = 1.41534
Mask shadow pattern
IMX = -1.401252644377248E-02, IMY = -4.955604407870279E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-98.531400 -14.540000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4832 35.3455 1.1 20.0 68.1 1.1322 10.3 1.3 Her X-1
288.7943 10.9310 7.1 52.0 23.7 0.7202 1.6 0.9 GRS 1915+105
299.5820 35.1989 0.8 36.8 -7.4 1.8444 15.1 0.4 Cyg X-1
307.9762 40.8732 8.3 37.6 -21.8 0.1696 1.4 7.7 Cyg X-3
326.2774 38.3494 8.0 49.6 -33.0 0.3693 1.4 5.2 Cyg X-2
308.0509 37.6397 1.3 39.8 -18.0 1.1597 8.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-14.540000 13.068610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6751 35.3971 31.6 19.9 67.6 -0.0259 -0.4 11.1 Her X-1
289.0187 10.9385 0.0 52.1 23.4 0.3593 1.2 13.0 GRS 1915+105
299.5832 35.0719 3.2 36.9 -7.3 0.2885 3.6 7.8 Cyg X-1
308.0470 40.8011 7.4 37.7 -21.7 0.1240 1.6 9.5 Cyg X-3
326.1811 38.1769 8.5 49.7 -32.8 0.2145 1.4 8.7 Cyg X-2
242.6632 30.2617 0.4 26.4 91.6 2.3956 26.3 ------ UNKNOWN
327.5196 42.0487 2.5 47.8 -37.4 0.6532 4.6 ------ UNKNOWN
95.7643 83.2490 2.4 41.0 -115.1 0.7617 4.8 ------ UNKNOWN
341.1297 59.2831 2.8 43.7 -63.8 0.9382 4.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
61.268590 602.298000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4796 35.3266 1.6 11.1 -36.2 5.5854 7.1 1.4 Her X-1
268.3025 -1.4776 26.9 40.0 41.8 0.8168 0.4 4.2 SW J1753.5-0127
288.8271 10.9728 1.9 46.9 8.1 9.9259 5.9 2.4 GRS 1915+105
299.6038 35.2129 1.8 47.5 -27.8 10.2975 6.5 0.9 Cyg X-1
308.1990 41.0714 6.0 53.1 -36.9 -7.1059 -1.9 8.2 Cyg X-3
253.2333 20.5321 3.1 13.6 37.2 3.2221 3.7 ------ UNKNOWN
180.1305 19.8951 3.2 56.9 179.1 20.1568 3.6 ------ UNKNOWN
300.0050 53.7266 2.9 47.0 -53.1 13.7363 4.0 ------ UNKNOWN
Plot creation:
Sun May 31 10:06:41 EDT 2015