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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.3375 44.8384 0.0030 5.3043 -66.3588 4.3165268 64.356 TRIG_00357512
Foreground time interval of the image:
-11.648 11.349 (delta_t = 22.997 [sec])
Background time interval of the image:
-239.552 -11.648 (delta_t = 227.904 [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 -11.648 sec. to 292.312 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58334 ( -0.0653594 0.0656361 )
Norm@50keV : 1.98167E-03 ( -6.63333e-05 6.61417e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.91 using 59 PHA bins.
# Reduced chi-squared = 0.9809 for 57 degrees of freedom
# Null hypothesis probability = 5.160123e-01
Photon flux (15-150 keV) in 304 sec: 0.253358 ( -0.00880401 0.00883842 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.64574e-06 ( -2.04179e-07 2.05056e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.648 sec. to 292.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58391 ( -0.201044 0.0644453 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.98392E-03 ( -6.43752e-05 0.000480303 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.93 using 59 PHA bins.
# Reduced chi-squared = 0.9987 for 56 degrees of freedom
# Null hypothesis probability = 4.775560e-01
Photon flux (15-150 keV) in 304 sec: 0.253384 ( -0.008969 0.008676 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.62017e-06 ( -2.07146e-07 2.40038e-07 ) ergs/cm2
Band function
Time interval is from -11.648 sec. to 292.312 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99675 ( -4.99675 -4.99675 )
beta : -1.59480 ( -0.0696411 0.0670648 )
Epeak [keV] : 19.9816 ( -19.9816 3.58345 )
Norm@50keV : 905.288 ( -29.4593 843928 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.21 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.668544e-01
Photon flux (15-150 keV) in 304 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] : 14.6527 ( )
R^2/D10^2 : 2.88590E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 282.35 using 59 PHA bins.
# Reduced chi-squared = 4.9535 for 57 degrees of freedom
# Null hypothesis probability = 1.385507e-31
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.958e-07 2.538e-08
25- 50 1.538e-06 6.019e-08
50-150 2.224e-06 1.517e-07
15-150 4.158e-06 1.672e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.01433 (-0.0330978 0.0330979)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.78 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 57 degrees of freedom
# Null hypothesis probability = 3.094389e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.691e-07 3.040e-08
25- 50 1.479e-06 6.110e-08
50-150 3.239e-06 5.819e-07
15-150 5.487e-06 5.943e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.19553 (-0.819806 0.873029)
R1^2/D10^2 : 0.255697 (-0.0825012 0.137758)
kT2 [keV] : 29.2370 (-3.91816 5.69256)
R2^2/D10^2 : 2.08924E-03 (-0.000926941 0.00136539)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.32 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 55 degrees of freedom
# Null hypothesis probability = 2.061904e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.510e-07 8.056e-08
25- 50 1.486e-06 1.015e-07
50-150 3.386e-06 4.262e-07
15-150 5.623e-06 5.943e-07
Peak spectrum fit
Power-law model
Time interval is from 6.456 sec. to 7.456 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30238 ( -0.0865943 0.0867113 )
Norm@50keV : 3.14592E-02 ( -0.00152852 0.00152595 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.02 using 59 PHA bins.
# Reduced chi-squared = 0.5968 for 57 degrees of freedom
# Null hypothesis probability = 9.932992e-01
Photon flux (15-150 keV) in 1 sec: 3.75481 ( -0.183655 0.18377 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10695e-07 ( -1.72055e-08 1.72961e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.456 sec. to 7.456 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18235 ( -0.337398 0.164532 )
Epeak [keV] : 355.380 ( -355.426 -355.426 )
Norm@50keV : 3.60124E-02 ( -0.0058292 0.0160748 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.60 using 59 PHA bins.
# Reduced chi-squared = 0.6001 for 56 degrees of freedom
# Null hypothesis probability = 9.923493e-01
Photon flux (15-150 keV) in 1 sec: 3.73323 ( -0.19186 0.18983 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08017e-07 ( -1.8916e-08 1.8778e-08 ) ergs/cm2
Band function
Time interval is from 6.456 sec. to 7.456 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.86468 ( -3.96167 -3.96167 )
beta : -1.36637 ( -0.107752 0.110012 )
Epeak [keV] : 31.0974 ( -27.2006 176.262 )
Norm@50keV : 6.69471 ( -6.65386 826.296 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.24 using 59 PHA bins.
# Reduced chi-squared = 0.5680 for 55 degrees of freedom
# Null hypothesis probability = 9.959117e-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] : 17.0808 ( )
R^2/D10^2 : 0.280378 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 129.81 using 59 PHA bins.
# Reduced chi-squared = 2.2773 for 57 degrees of freedom
# Null hypothesis probability = 1.328215e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.664e-08 1.555e-09
25- 50 7.390e-08 5.040e-09
50-150 1.542e-07 1.360e-08
15-150 2.447e-07 1.580e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 15.2970 (-0.757555 0.757583)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.36 using 59 PHA bins.
# Reduced chi-squared = 0.9888 for 57 degrees of freedom
# Null hypothesis probability = 4.989878e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.839e-08 2.110e-09
25- 50 7.385e-08 4.090e-09
50-150 1.620e-07 1.135e-08
15-150 2.742e-07 2.100e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.42382 (-1.21161 1.43904)
R1^2/D10^2 : 2.86276 (-1.20984 2.32051)
kT2 [keV] : 30.5440 (-4.89309 8.48388)
R2^2/D10^2 : 3.36188E-02 (-0.0182652 0.0274006)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.42 using 59 PHA bins.
# Reduced chi-squared = 0.6076 for 55 degrees of freedom
# Null hypothesis probability = 9.905238e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.169e-08 4.600e-09
25- 50 7.123e-08 1.015e-08
50-150 2.057e-07 4.530e-08
15-150 3.086e-07 5.095e-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: 1.26161 ( -0.0469182 0.046822 )
Norm@50keV : 1.22159E-02 ( -0.000294531 0.000294429 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.21 using 59 PHA bins.
# Reduced chi-squared = 0.7054 for 57 degrees of freedom
# Null hypothesis probability = 9.551242e-01
Photon flux (15-150 keV) in 23 sec: 1.44759 ( -0.0376208 0.0377427 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.8034e-06 ( -7.27794e-08 7.29705e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18766 ( -0.189527 0.0642863 )
Epeak [keV] : 584.946 ( -982.977 -982.977 )
Norm@50keV : 1.31672E-02 ( -0.000782417 0.00244977 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.34 using 59 PHA bins.
# Reduced chi-squared = 0.7203 for 56 degrees of freedom
# Null hypothesis probability = 9.430976e-01
Photon flux (15-150 keV) in 23 sec: 1.44668 ( -0.04801 0.03935 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79457e-06 ( -7.7418e-08 8.0385e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.150972 ( -1.17186 -1.17186 )
beta : -1.28549 ( -0.0647367 0.0548783 )
Epeak [keV] : 42.1035 ( -32.7992 128.249 )
Norm@50keV : 0.118367 ( -0.118214 477.993 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.29 using 59 PHA bins.
# Reduced chi-squared = 0.6961 for 55 degrees of freedom
# Null hypothesis probability = 9.578184e-01
Photon flux (15-150 keV) in 23 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) = 1.45e-06
S(50-100 keV) = 1.94e-06
T90 vs. Hardness ratio plot
T90 = 266.399999916553 sec.
Hardness ratio (energy fluence ratio) = 1.33793
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.21798
Count Ratio (50-100 keV) / (15-25 keV) = 0.858074
Mask shadow pattern
IMX = 3.723090554828558E-02, IMY = 8.505123562137634E-02
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:
-239.552000 -11.648000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4236 35.5138 8.3 4.3 119.7 0.2851 1.4 10.4 Her X-1
299.5914 35.2086 0.5 36.5 32.3 7.6563 24.9 0.4 Cyg X-1
308.0852 40.9844 2.5 40.9 20.1 1.6297 4.7 2.2 Cyg X-3
326.1619 38.4147 2.7 54.8 16.5 4.6408 4.2 5.6 Cyg X-2
245.7439 -2.1866 3.6 42.6 141.6 1.8225 3.2 ------ UNKNOWN
194.1889 26.0966 4.6 50.6 -136.5 2.9885 2.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-11.648000 11.348600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3117 35.2517 4.6 4.6 121.4 0.1664 2.5 9.0 Her X-1
299.7599 35.2461 20.3 36.6 32.2 0.0673 0.6 8.7 Cyg X-1
308.0752 41.0681 4.6 40.9 20.0 -0.3081 -2.5 7.1 Cyg X-3
326.3923 38.4176 13.2 55.0 16.4 0.3831 0.9 11.9 Cyg X-2
245.4130 -4.8718 2.3 45.3 141.5 1.1906 4.9 ------ UNKNOWN
232.6680 -7.7150 2.4 51.2 157.0 1.4431 4.8 ------ UNKNOWN
251.3375 44.8384 0.2 5.3 -66.4 4.3166 64.4 ------ UNKNOWN
339.8019 62.0467 2.2 54.0 -14.5 1.0474 5.2 ------ UNKNOWN
209.6817 35.0303 2.5 34.8 -133.5 0.4551 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
32.948600 489.348620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6063 35.4285 3.7 9.7 115.8 1.0915 3.1 8.9 Her X-1
299.5940 35.1905 0.4 37.6 39.3 16.8283 27.4 0.7 Cyg X-1
308.1345 40.9833 4.4 40.9 26.3 1.6363 2.6 2.1 Cyg X-3
251.3364 44.8292 0.9 0.0 -126.3 4.1303 12.7 ------ UNKNOWN
246.0242 46.1086 2.9 4.0 -117.5 1.3407 3.9 ------ UNKNOWN
226.0398 47.2807 2.5 17.7 -121.3 1.5712 4.6 ------ UNKNOWN
192.2835 19.0447 4.3 54.9 -146.1 8.0657 2.7 ------ UNKNOWN
Plot creation:
Sun May 31 03:29:24 EDT 2015