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
10.3287 33.9802 0.0114 29.6482 -143.7181 0.2466740 16.842 TRIG_00627137
Foreground time interval of the image:
-0.404 0.952 (delta_t = 1.356 [sec])
Background time interval of the image:
-239.488 -0.404 (delta_t = 239.084 [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 0.256000
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 0.256000
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 0.256000
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 -0.404 sec. to 0.952 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81034 ( -0.175711 0.181887 )
Norm@50keV : 1.15570E-02 ( -0.0012939 0.00126674 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.09 using 59 PHA bins.
# Reduced chi-squared = 0.8261 for 57 degrees of freedom
# Null hypothesis probability = 8.225449e-01
Photon flux (15-150 keV) in 1.356 sec: 1.59896 ( -0.15212 0.152209 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44221e-07 ( -1.62508e-08 1.65065e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.404 sec. to 0.952 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77390 ( -0.571184 0.671806 )
Epeak [keV] : 278.989 ( )
Norm@50keV : 1.21029E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.12 using 59 PHA bins.
# Reduced chi-squared = 0.8414 for 56 degrees of freedom
# Null hypothesis probability = 7.951848e-01
Photon flux (15-150 keV) in 1.356 sec: 1.59890 ( -0.15256 0.1517 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4368e-07 ( -1.74285e-08 1.70327e-08 ) ergs/cm2
Band function
Time interval is from -0.404 sec. to 0.952 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.56388 ( -4.56388 -4.56388 )
beta : -1.89607 ( -0.22189 0.202685 )
Epeak [keV] : 22.3046 ( -22.3046 4.30587 )
Norm@50keV : 1511.65 ( -142.524 1.06799e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.32 using 59 PHA bins.
# Reduced chi-squared = 0.8421 for 55 degrees of freedom
# Null hypothesis probability = 7.914173e-01
Photon flux (15-150 keV) in 1.356 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] : 10.5950 (-1.39127 1.67879)
R^2/D10^2 : 0.585240 (-0.245487 0.409088)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.99 using 59 PHA bins.
# Reduced chi-squared = 1.474 for 57 degrees of freedom
# Null hypothesis probability = 1.152118e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.846e-08 3.119e-09
25- 50 4.968e-08 5.926e-09
50-150 3.058e-08 8.150e-09
15-150 9.872e-08 1.212e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 101.873 (-32.1688 62.3416)
Norm : 6.98596 (-0.894196 1.11433)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.18 using 59 PHA bins.
# Reduced chi-squared = 0.8629 for 57 degrees of freedom
# Null hypothesis probability = 7.596982e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.476e-08 3.376e-09
25- 50 4.297e-08 5.038e-09
50-150 7.037e-08 2.831e-08
15-150 1.381e-07 3.171e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.15557 (-1.17346 1.33464)
R1^2/D10^2 : 3.49021 (-1.79621 4.36396)
kT2 [keV] : 27.0363 (-7.0171 13.8458)
R2^2/D10^2 : 1.48094E-02 (-0.0108365 0.0285095)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.57 using 59 PHA bins.
# Reduced chi-squared = 0.8103 for 55 degrees of freedom
# Null hypothesis probability = 8.415955e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.714e-08 8.706e-09
25- 50 4.042e-08 1.155e-08
50-150 7.949e-08 4.197e-08
15-150 1.471e-07 5.213e-08
Peak spectrum fit
Power-law model
Time interval is from -0.064 sec. to 0.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79356 ( -0.185342 0.19248 )
Norm@50keV : 1.28511E-02 ( -0.00153735 0.00150326 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.24 using 59 PHA bins.
# Reduced chi-squared = 0.7411 for 57 degrees of freedom
# Null hypothesis probability = 9.278323e-01
Photon flux (15-150 keV) in 1 sec: 1.76645 ( -0.179864 0.179945 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18336e-07 ( -1.43161e-08 1.45435e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.064 sec. to 0.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79265 ( -0.619673 0.67074 )
Epeak [keV] : 9998.73 ( )
Norm@50keV : 1.28672E-02 ( -0.0051422 0.0160403 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.24 using 59 PHA bins.
# Reduced chi-squared = 0.7543 for 56 degrees of freedom
# Null hypothesis probability = 9.131865e-01
Photon flux (15-150 keV) in 1 sec: 1.76631 ( -0.18008 0.1792 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17918e-07 ( -1.5401e-08 1.4959e-08 ) ergs/cm2
Band function
Time interval is from -0.064 sec. to 0.936 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.68260 ( -4.17804 -4.17804 )
beta : -1.89999 ( -0.27931 0.238014 )
Epeak [keV] : 24.4702 ( -23.5089 19.7758 )
Norm@50keV : 36.9068 ( -36.8944 1014.86 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.16 using 59 PHA bins.
# Reduced chi-squared = 0.7483 for 55 degrees of freedom
# Null hypothesis probability = 9.170454e-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] : 10.4897 (-1.44625 1.78607)
R^2/D10^2 : 0.676141 (-0.296534 0.504232)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.80 using 59 PHA bins.
# Reduced chi-squared = 1.295 for 57 degrees of freedom
# Null hypothesis probability = 6.655441e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.537e-08 2.680e-09
25- 50 4.083e-08 5.605e-09
50-150 2.444e-08 6.490e-09
15-150 8.064e-08 1.133e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 100.554 (-32.0122 76.2947)
Norm : 7.78305 (-1.08922 1.23455)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.99 using 59 PHA bins.
# Reduced chi-squared = 0.7718 for 57 degrees of freedom
# Null hypothesis probability = 8.964751e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.034e-08 2.935e-09
25- 50 3.522e-08 4.515e-09
50-150 5.725e-08 2.231e-08
15-150 1.128e-07 2.643e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.32120 (-1.24636 1.44195)
R1^2/D10^2 : 3.50753 (-1.83697 4.50108)
kT2 [keV] : 27.9683 (-7.89326 18.1853)
R2^2/D10^2 : 1.45444E-02 (-0.0114334 0.0327354)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.76 using 59 PHA bins.
# Reduced chi-squared = 0.7230 for 55 degrees of freedom
# Null hypothesis probability = 9.392631e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.185e-08 9.033e-09
25- 50 3.340e-08 1.066e-08
50-150 6.541e-08 3.623e-08
15-150 1.207e-07 4.302e-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: 1.81034 ( -0.175711 0.181887 )
Norm@50keV : 1.15570E-02 ( -0.0012939 0.00126674 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.09 using 59 PHA bins.
# Reduced chi-squared = 0.8261 for 57 degrees of freedom
# Null hypothesis probability = 8.225449e-01
Photon flux (15-150 keV) in 1.356 sec: 1.59896 ( -0.15212 0.152209 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44221e-07 ( -1.62508e-08 1.65065e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77390 ( -0.571184 0.671806 )
Epeak [keV] : 278.989 ( )
Norm@50keV : 1.21029E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.12 using 59 PHA bins.
# Reduced chi-squared = 0.8414 for 56 degrees of freedom
# Null hypothesis probability = 7.951848e-01
Photon flux (15-150 keV) in 1.356 sec: 1.59890 ( -0.15256 0.1517 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4368e-07 ( -1.74285e-08 1.70327e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.56388 ( -4.56388 -4.56388 )
beta : -1.89607 ( -0.22189 0.202685 )
Epeak [keV] : 22.3046 ( -22.3046 4.30587 )
Norm@50keV : 1511.65 ( -142.524 1.06799e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.32 using 59 PHA bins.
# Reduced chi-squared = 0.8421 for 55 degrees of freedom
# Null hypothesis probability = 7.914173e-01
Photon flux (15-150 keV) in 1.356 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) = 4.08e-08
S(50-100 keV) = 4.65e-08
T90 vs. Hardness ratio plot
T90 = 1.19599992036819 sec.
Hardness ratio (energy fluence ratio) = 1.13971
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.09027
Count Ratio (50-100 keV) / (15-25 keV) = 0.741911
Mask shadow pattern
IMX = -4.588351045099284E-01, IMY = 3.368247373716360E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
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:
-239.488000 -0.404000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
108.4751 55.1024 2.9 40.5 69.1 2.6193 4.0 ------ UNKNOWN
75.7641 41.2146 2.8 35.6 110.4 1.6672 4.1 ------ UNKNOWN
163.8134 63.3381 2.9 50.8 31.5 4.2473 3.9 ------ UNKNOWN
286.0614 51.0506 3.4 50.9 -44.5 3.1512 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.404000 0.952000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
63.6726 28.5954 2.2 41.2 134.7 0.1597 5.1 ------ UNKNOWN
10.3287 33.9802 0.7 29.6 -143.7 0.2467 16.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
60.012600 951.612590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.2540 40.7948 4.8 48.7 -33.9 -3.3332 -2.4 11.5 Cyg X-3
326.1607 38.4284 3.8 35.6 -40.8 2.2703 3.0 6.4 Cyg X-2
33.3273 30.9798 3.2 19.6 121.5 1.8118 3.6 ------ UNKNOWN
39.4941 -2.4553 2.6 45.6 166.0 5.1768 4.5 ------ UNKNOWN
40.2452 -15.1838 2.8 56.8 173.9 12.0407 4.2 ------ UNKNOWN
13.3758 47.5355 2.7 13.7 37.7 2.0835 4.3 ------ UNKNOWN
32.1173 -20.4664 2.5 58.3 -175.2 12.4038 4.5 ------ UNKNOWN
294.4851 61.6310 3.2 54.0 -5.8 5.7764 3.6 ------ UNKNOWN
322.1646 22.0135 3.7 43.8 -63.9 8.8235 3.2 ------ UNKNOWN
353.8118 -11.3685 2.2 48.0 -129.0 12.7139 5.1 ------ UNKNOWN
Plot creation:
Thu May 28 13:40:08 EDT 2015