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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
27.8894 61.3537 0.0130 19.4050 -7.6971 0.1934305 14.838 TRIG_00332516
Foreground time interval of the image:
-1.656 0.268 (delta_t = 1.924 [sec])
Background time interval of the image:
-239.064 -1.656 (delta_t = 237.408 [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 0.128000
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 0.128000
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 0.128000
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 -1.656 sec. to 0.268 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10608 ( -0.211978 0.205145 )
Norm@50keV : 6.31680E-03 ( -0.000721074 0.000719764 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.60 using 59 PHA bins.
# Reduced chi-squared = 1.432 for 57 degrees of freedom
# Null hypothesis probability = 1.798267e-02
Photon flux (15-150 keV) in 1.924 sec: 0.733143 ( -0.0859335 0.0861389 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26824e-07 ( -1.60625e-08 1.61977e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.656 sec. to 0.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10137 ( -0.213682 0.206388 )
Epeak [keV] : 9999.33 ( -9999.36 -9999.36 )
Norm@50keV : 6.35024E-03 ( -0.00243716 0.00441701 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.62 using 59 PHA bins.
# Reduced chi-squared = 1.457 for 56 degrees of freedom
# Null hypothesis probability = 1.435461e-02
Photon flux (15-150 keV) in 1.924 sec: 0.734174 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26074e-07 ( -1.53579e-08 1.66774e-08 ) ergs/cm2
Band function
Time interval is from -1.656 sec. to 0.268 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.80876 ( -4.80876 -4.80876 )
beta : -1.20255 ( -0.271315 0.242148 )
Epeak [keV] : 27.9408 ( -27.9408 6.96663 )
Norm@50keV : 185.552 ( -21.0259 1.46644e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.31 using 59 PHA bins.
# Reduced chi-squared = 1.460 for 55 degrees of freedom
# Null hypothesis probability = 1.462526e-02
Photon flux (15-150 keV) in 1.924 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] : 19.2170 (-3.18405 4.21498)
R^2/D10^2 : 3.79985E-02 (-0.0176683 0.0307358)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 104.06 using 59 PHA bins.
# Reduced chi-squared = 1.8256 for 57 degrees of freedom
# Null hypothesis probability = 1.419207e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.285e-09 1.382e-09
25- 50 2.562e-08 5.035e-09
50-150 6.969e-08 1.501e-08
15-150 1.006e-07 1.678e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.00658 (-0.353107 0.35309)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 94.76 using 59 PHA bins.
# Reduced chi-squared = 1.662 for 57 degrees of freedom
# Null hypothesis probability = 1.248333e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.440e-08 8.126e-09
25- 50 2.770e-08 1.534e-08
50-150 6.076e-08 3.363e-08
15-150 1.029e-07 5.636e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.84186 (-3.26668 2.66854)
R1^2/D10^2 : 0.253403 (-0.0989638 0.35281)
kT2 [keV] : 75.4050 (-154.022 -196.847)
R2^2/D10^2 : 6.85231E-04 (-3.46301e-05 0.00259839)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.60 using 59 PHA bins.
# Reduced chi-squared = 1.429 for 55 degrees of freedom
# Null hypothesis probability = 2.007483e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.015e-08 5.186e-09
25- 50 2.780e-08 1.340e-08
50-150 8.842e-08 4.927e-08
15-150 1.264e-07 6.009e-08
Peak spectrum fit
Power-law model
Time interval is from -0.732 sec. to 0.268 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07705 ( -0.211809 0.205095 )
Norm@50keV : 9.39096E-03 ( -0.00105845 0.00105556 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.32 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 57 degrees of freedom
# Null hypothesis probability = 1.865151e-01
Photon flux (15-150 keV) in 1 sec: 1.08699 ( -0.125263 0.125603 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.8915e-08 ( -1.24182e-08 1.25146e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.732 sec. to 0.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06761 ( -0.280376 0.210739 )
Epeak [keV] : 9999.08 ( -9999.32 -9999.32 )
Norm@50keV : 9.43989E-03 ( -0.00944049 0.00447682 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.35 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 56 degrees of freedom
# Null hypothesis probability = 1.621497e-01
Photon flux (15-150 keV) in 1 sec: 1.08939 ( -0.126531 0.12326 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.88188e-08 ( -1.22411e-08 1.29292e-08 ) ergs/cm2
Band function
Time interval is from -0.732 sec. to 0.268 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.51287 ( 0.746522 0.746522 )
beta : -1.10799 ( 1.08698 0.219827 )
Epeak [keV] : 31.3130 ( -58.9588 727.611 )
Norm@50keV : 0.958060 ( -0.957045 343.001 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.18 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 55 degrees of freedom
# Null hypothesis probability = 1.437850e-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] : 20.1511 (-3.49738 4.68271)
R^2/D10^2 : 4.84997E-02 (-0.0230871 0.0410917)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 92.89 using 59 PHA bins.
# Reduced chi-squared = 1.630 for 57 degrees of freedom
# Null hypothesis probability = 1.879021e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.785e-09 8.845e-10
25- 50 1.895e-08 3.375e-09
50-150 5.710e-08 1.146e-08
15-150 7.983e-08 1.452e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.42722 (-0.514866 0.514846)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.79 using 59 PHA bins.
# Reduced chi-squared = 1.435 for 57 degrees of freedom
# Null hypothesis probability = 1.734833e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.103e-08 6.110e-09
25- 50 2.121e-08 1.170e-08
50-150 4.652e-08 2.582e-08
15-150 7.875e-08 4.342e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.5119 (-2.29275 2.38291)
R1^2/D10^2 : 0.315303 (-0.193037 0.327533)
kT2 [keV] : 199.318 ( )
R2^2/D10^2 : 2.30247E-04 (-4.77945e-05 0.00298956)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.48 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.71 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 55 degrees of freedom
# Reduced chi-squared = 1.122 for 55 degrees of freedom
# Null hypothesis probability = 2.278568e-01
# Null hypothesis probability = 2.486821e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.803e-09 3.202e-09
25- 50 2.108e-08 9.104e-09
50-150 7.054e-08 4.084e-08
15-150 9.942e-08 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: 1.10608 ( -0.211978 0.205145 )
Norm@50keV : 6.31680E-03 ( -0.000721074 0.000719764 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.60 using 59 PHA bins.
# Reduced chi-squared = 1.432 for 57 degrees of freedom
# Null hypothesis probability = 1.798267e-02
Photon flux (15-150 keV) in 1.924 sec: 0.733143 ( -0.0859335 0.0861389 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26824e-07 ( -1.60625e-08 1.61977e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10137 ( -0.213682 0.206388 )
Epeak [keV] : 9999.33 ( -9999.36 -9999.36 )
Norm@50keV : 6.35024E-03 ( -0.00243716 0.00441701 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.62 using 59 PHA bins.
# Reduced chi-squared = 1.457 for 56 degrees of freedom
# Null hypothesis probability = 1.435461e-02
Photon flux (15-150 keV) in 1.924 sec: 0.734174 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26074e-07 ( -1.53579e-08 1.66774e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.80876 ( -4.80876 -4.80876 )
beta : -1.20255 ( -0.271315 0.242148 )
Epeak [keV] : 27.9408 ( -27.9408 6.96663 )
Norm@50keV : 185.552 ( -21.0259 1.46644e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.31 using 59 PHA bins.
# Reduced chi-squared = 1.460 for 55 degrees of freedom
# Null hypothesis probability = 1.462526e-02
Photon flux (15-150 keV) in 1.924 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) = 2.51e-08
S(50-100 keV) = 4.67e-08
T90 vs. Hardness ratio plot
T90 = 1.82400000095367 sec.
Hardness ratio (energy fluence ratio) = 1.86056
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.67848
Count Ratio (50-100 keV) / (15-25 keV) = 1.42862
Mask shadow pattern
IMX = 3.490792835708678E-01, IMY = 4.717955129490216E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
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:
-239.064000 -1.656000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5924 35.1990 0.4 43.4 -145.1 9.6949 30.4 0.2 Cyg X-1
308.1368 40.9505 4.3 34.6 -144.4 0.5788 2.7 1.2 Cyg X-3
326.1262 38.3321 3.0 25.2 -165.9 0.6565 3.9 2.2 Cyg X-2
327.6488 3.5298 3.0 54.0 161.1 4.0275 3.9 ------ UNKNOWN
72.0904 41.4136 3.5 50.4 14.4 1.7854 3.4 ------ UNKNOWN
53.7233 53.1844 1.7 33.8 8.6 1.4054 6.8 ------ UNKNOWN
95.7514 52.3387 3.0 55.8 -9.0 2.3276 3.8 ------ UNKNOWN
315.7480 48.3460 2.8 26.2 -136.9 0.7980 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.656000 0.268000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.7502 35.2635 84.3 43.2 -145.1 -0.0035 -0.1 8.7 Cyg X-1
307.9284 40.9520 21.9 34.7 -144.3 0.0092 0.5 8.2 Cyg X-3
326.1786 38.2239 4.3 25.2 -166.1 0.0362 2.7 5.9 Cyg X-2
333.1788 18.4963 2.1 38.1 162.1 0.1143 5.6 ------ UNKNOWN
27.8894 61.3538 0.8 19.4 -7.7 0.1934 14.8 ------ UNKNOWN
355.3607 64.7256 2.2 13.0 -58.6 0.0675 5.2 ------ UNKNOWN
309.1709 50.1869 2.6 29.5 -129.7 0.0746 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
56.436600 963.021000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5936 35.1914 1.9 58.9 -161.0 23.8417 6.1 0.6 Cyg X-1
308.1764 40.8773 3.4 50.3 -163.6 3.7345 3.4 5.4 Cyg X-3
326.2125 38.4592 10.3 43.6 179.4 0.8184 1.1 8.5 Cyg X-2
9.0760 42.8395 2.8 21.6 131.6 1.9246 4.1 ------ UNKNOWN
53.7801 53.1745 0.9 16.0 20.5 5.6836 13.6 ------ UNKNOWN
345.1585 56.4311 2.9 22.2 -171.8 1.6396 3.9 ------ UNKNOWN
262.2471 70.1089 3.5 43.1 -112.2 7.9066 3.3 ------ UNKNOWN
Plot creation:
Sun May 31 05:45:41 EDT 2015