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
47.5490 28.4948 0.0057 11.3491 109.5526 0.2940537 33.860 TRIG_00516997
Foreground time interval of the image:
0.000 0.128 (delta_t = 0.128 [sec])
Background time interval of the image:
-657.567 -640.191 (delta_t = 17.377 [sec])
-239.068 0.000 (delta_t = 239.068 [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 0.064000
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 0.064000
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 0.064000
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)
The mask-weighted light curves based on cleaned DPHs
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 0.000 sec. to 0.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.992083 ( -0.089597 0.0891914 )
Norm@50keV : 0.143079 ( -0.00748925 0.00748869 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.32 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.358180e-01
Photon flux (15-150 keV) in 0.128 sec: 16.4660 ( -0.86223 0.861478 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98456e-07 ( -1.21697e-08 1.2523e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.675105 ( -0.372192 0.339679 )
Epeak [keV] : 222.885 ( -92.5833 -222.887 )
Norm@50keV : 0.203660 ( -0.0554945 0.10073 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.83 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 56 degrees of freedom
# Null hypothesis probability = 2.758933e-01
Photon flux (15-150 keV) in 0.128 sec: 16.2966 ( -0.8846 0.8821 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.94264e-07 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.86977 ( -4.831 -4.86977 )
beta : -1.09284 ( -0.107321 0.104857 )
Epeak [keV] : 28.9767 ( -4.34796 3.92911 )
Norm@50keV : 3452.23 ( -179.9 10121.6 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.79 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 4.083016e-01
Photon flux (15-150 keV) in 0.128 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] : 19.9704 ( )
R^2/D10^2 : 0.805583 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 117.60 using 59 PHA bins.
# Reduced chi-squared = 2.0631 for 57 degrees of freedom
# Null hypothesis probability = 4.226049e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.932e-09 7.795e-10
25- 50 3.947e-08 2.746e-09
50-150 1.167e-07 1.147e-08
15-150 1.641e-07 1.139e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 62.7244 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 154.92 using 59 PHA bins.
# Reduced chi-squared = 2.7180 for 57 degrees of freedom
# Null hypothesis probability = 5.444918e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.999e-08 1.158e-09
25- 50 3.846e-08 3.002e-09
50-150 8.435e-08 1.969e-08
15-150 1.428e-07 2.775e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.48863 (-2.15228 2.54836)
R1^2/D10^2 : 4.78057 (-2.12988 4.83058)
kT2 [keV] : 38.8362 (-9.40564 28.6112)
R2^2/D10^2 : 8.36656E-02 (-0.0644068 0.068091)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.90 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 55 degrees of freedom
# Null hypothesis probability = 3.024564e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.313e-08 2.838e-09
25- 50 3.973e-08 7.885e-09
50-150 1.439e-07 6.129e-08
15-150 1.968e-07 6.630e-08
Peak spectrum fit
Power-law model
Time interval is from -0.434 sec. to 0.566 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03872 ( -0.12135 0.119932 )
Norm@50keV : 1.91597E-02 ( -0.00130952 0.00130942 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.63 using 59 PHA bins.
# Reduced chi-squared = 0.9234 for 57 degrees of freedom
# Null hypothesis probability = 6.395168e-01
Photon flux (15-150 keV) in 1 sec: 2.21106 ( -0.152661 0.152729 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04411e-07 ( -1.60604e-08 1.6176e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.434 sec. to 0.566 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.838242 ( -0.489828 0.259231 )
Epeak [keV] : 313.177 ( -313.178 -313.178 )
Norm@50keV : 2.38622E-02 ( -0.00574322 0.0161506 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.05 using 59 PHA bins.
# Reduced chi-squared = 0.9295 for 56 degrees of freedom
# Null hypothesis probability = 6.250831e-01
Photon flux (15-150 keV) in 1 sec: 2.19361 ( -0.15764 0.15735 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01666e-07 ( -1.7547e-08 1.7358e-08 ) ergs/cm2
Band function
Time interval is from -0.434 sec. to 0.566 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96198 ( -14.7043 -4.96198 )
beta : -1.11464 ( -0.168966 0.136823 )
Epeak [keV] : 27.5069 ( -8.80222 5.56648 )
Norm@50keV : 737.677 ( -50.2764 9237.1 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.75 using 59 PHA bins.
# Reduced chi-squared = 0.9045 for 55 degrees of freedom
# Null hypothesis probability = 6.748792e-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] : 20.2094 (-1.90912 2.17676)
R^2/D10^2 : 0.101830 (-0.0279335 0.0375566)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.15 using 59 PHA bins.
# Reduced chi-squared = 1.564 for 57 degrees of freedom
# Null hypothesis probability = 4.143095e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.984e-09 1.140e-09
25- 50 4.004e-08 3.805e-09
50-150 1.214e-07 1.490e-08
15-150 1.694e-07 1.510e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 8.76809 (-0.623768 0.623768)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.61 using 59 PHA bins.
# Reduced chi-squared = 1.712 for 57 degrees of freedom
# Null hypothesis probability = 6.555106e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.182e-08 1.870e-09
25- 50 4.199e-08 6.280e-09
50-150 9.208e-08 3.153e-08
15-150 1.559e-07 4.588e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.94286 (-2.43014 3.06207)
R1^2/D10^2 : 0.792909 (-0.429258 1.18526)
kT2 [keV] : 37.8073 (-10.0534 37.239)
R2^2/D10^2 : 1.20762E-02 (-0.0100085 0.0203814)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.30 using 59 PHA bins.
# Reduced chi-squared = 0.9327 for 55 degrees of freedom
# Null hypothesis probability = 6.169295e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.462e-08 4.815e-09
25- 50 4.144e-08 1.251e-08
50-150 1.480e-07 6.767e-08
15-150 2.041e-07 7.637e-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: 0.992083 ( -0.089597 0.0891914 )
Norm@50keV : 0.143079 ( -0.00748925 0.00748869 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.32 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.358180e-01
Photon flux (15-150 keV) in 0.128 sec: 16.4660 ( -0.86223 0.861478 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98456e-07 ( -1.21697e-08 1.2523e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.675105 ( -0.372192 0.339679 )
Epeak [keV] : 222.885 ( -92.5833 -222.887 )
Norm@50keV : 0.203660 ( -0.0554945 0.10073 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.83 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 56 degrees of freedom
# Null hypothesis probability = 2.758933e-01
Photon flux (15-150 keV) in 0.128 sec: 16.2966 ( -0.8846 0.8821 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.94264e-07 ( 0 0 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.86977 ( -4.83102 -4.86977 )
beta : -1.09284 ( -0.107321 0.104857 )
Epeak [keV] : 28.9767 ( -4.34796 3.92911 )
Norm@50keV : 3452.23 ( -179.9 10121.6 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.79 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 4.083016e-01
Photon flux (15-150 keV) in 0.128 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) = 3.66e-08
S(50-100 keV) = 7.36e-08
T90 vs. Hardness ratio plot
T90 = 0.0999999046325684 sec.
Hardness ratio (energy fluence ratio) = 2.01093
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.85479
Count Ratio (50-100 keV) / (15-25 keV) = 1.90415
Mask shadow pattern
IMX = -6.717245590820499E-02, IMY = -1.891371247912358E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
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:
-657.567400 -640.190500
-239.068000 0.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.1660 38.2232 4.6 58.8 -20.7 3.0771 2.5 5.9 Cyg X-2
10.3249 66.6781 2.7 44.2 24.5 1.5516 4.3 ------ UNKNOWN
75.1851 -4.5296 2.9 48.9 160.4 2.9520 4.0 ------ UNKNOWN
10.5027 47.4878 2.4 29.6 3.4 0.9683 4.9 ------ UNKNOWN
338.3605 46.8582 2.5 49.5 -10.5 1.7101 4.6 ------ UNKNOWN
49.6163 -24.2463 2.9 51.5 -158.3 2.0616 4.0 ------ UNKNOWN
31.7743 -12.1515 3.1 37.6 -135.9 1.2198 3.7 ------ UNKNOWN
35.8994 -27.8760 3.3 53.2 -142.2 3.4967 3.5 ------ UNKNOWN
354.4565 7.8306 2.8 42.7 -68.5 3.9896 4.1 575.1 UNKNOWN
25.1472 -21.5895 3.0 48.0 -128.8 3.1938 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.000000 0.128000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.1591 38.3321 5.4 58.8 -20.5 0.1130 2.1 0.9 Cyg X-2
47.5490 28.4948 0.3 11.3 109.6 0.2941 33.9 ------ UNKNOWN
13.0763 -10.2408 2.1 41.7 -107.5 0.1732 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
51.832600 662.964900
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6409 22.0128 0.5 33.2 113.3 24.7545 24.3 0.4 Crab
36.2541 72.7945 2.9 44.7 15.7 3.9846 4.0 ------ UNKNOWN
51.3681 -25.4206 3.0 54.0 -163.9 6.3668 3.8 ------ UNKNOWN
337.9465 54.9533 2.9 55.5 -20.4 7.2141 3.9 ------ UNKNOWN
24.5315 -14.0155 2.5 48.0 -128.9 10.8692 4.6 ------ UNKNOWN
349.5269 33.7644 3.4 49.3 -48.1 10.1321 3.4 ------ UNKNOWN
Plot creation:
Sat May 30 20:10:15 EDT 2015