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
26.5118 69.4687 0.0072 29.6888 -98.7296 0.7115681 26.760 TRIG_00310219
Foreground time interval of the image:
-0.148 2.088 (delta_t = 2.236 [sec])
Background time interval of the image:
-511.295 -489.616 (delta_t = 21.679 [sec])
-239.696 -0.148 (delta_t = 239.548 [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)
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 -0.148 sec. to 2.088 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91452 ( -0.117233 0.120216 )
Norm@50keV : 1.82122E-02 ( -0.00132707 0.00131045 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.87 using 59 PHA bins.
# Reduced chi-squared = 0.8749 for 57 degrees of freedom
# Null hypothesis probability = 7.372562e-01
Photon flux (15-150 keV) in 2.236 sec: 2.62989 ( -0.171017 0.17124 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.74452e-07 ( -2.66858e-08 2.68736e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.148 sec. to 2.088 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74737 ( -0.455013 0.396459 )
Epeak [keV] : 69.7961 ( -58.3436 -69.7961 )
Norm@50keV : 2.24113E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.41 using 59 PHA bins.
# Reduced chi-squared = 0.8823 for 56 degrees of freedom
# Null hypothesis probability = 7.208191e-01
Photon flux (15-150 keV) in 2.236 sec: 2.60897 ( -0.1783 0.17832 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.69477e-07 ( -2.96315e-08 2.96359e-08 ) ergs/cm2
Band function
Time interval is from -0.148 sec. to 2.088 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.74744 ( 1.764 0.447353 )
beta : -10.0000 ( 10 4.08562e-14 )
Epeak [keV] : 69.7885 ( -30.0886 -69.7885 )
Norm@50keV : 2.24046E-02 ( -0.00540192 0.0165209 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.41 using 59 PHA bins.
# Reduced chi-squared = 0.8984 for 55 degrees of freedom
# Null hypothesis probability = 6.872485e-01
Photon flux (15-150 keV) in 2.236 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] : 11.2589 ( )
R^2/D10^2 : 0.760131 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 123.79 using 59 PHA bins.
# Reduced chi-squared = 2.1717 for 57 degrees of freedom
# Null hypothesis probability = 7.545259e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.521e-08 5.981e-09
25- 50 1.317e-07 9.961e-09
50-150 9.595e-08 1.479e-08
15-150 2.728e-07 2.113e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 85.4163 (-16.9514 24.293)
Norm : 11.9631 (-1.15838 1.33225)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.00 using 59 PHA bins.
# Reduced chi-squared = 0.9123 for 57 degrees of freedom
# Null hypothesis probability = 6.626583e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.966e-08 7.625e-09
25- 50 1.164e-07 7.267e-09
50-150 1.716e-07 5.294e-08
15-150 3.577e-07 5.456e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.74387 (-0.865759 0.966658)
R1^2/D10^2 : 7.17313 (-3.1878 6.57327)
kT2 [keV] : 21.8785 (-3.49143 5.09496)
R2^2/D10^2 : 4.74254E-02 (-0.0259374 0.0464005)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8506 for 55 degrees of freedom
# Null hypothesis probability = 7.768771e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.528e-08 1.680e-08
25- 50 1.093e-07 2.294e-08
50-150 1.820e-07 5.153e-08
15-150 3.666e-07 7.647e-08
Peak spectrum fit
Power-law model
Time interval is from -0.112 sec. to 0.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91051 ( -0.106964 0.109734 )
Norm@50keV : 3.17351E-02 ( -0.00225328 0.00223101 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.60 using 59 PHA bins.
# Reduced chi-squared = 1.467 for 57 degrees of freedom
# Null hypothesis probability = 1.240227e-02
Photon flux (15-150 keV) in 1 sec: 4.57477 ( -0.290702 0.290945 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91797e-07 ( -2.03517e-08 2.04741e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.112 sec. to 0.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13769 ( -0.508296 0.455234 )
Epeak [keV] : 50.5474 ( -7.73588 13.613 )
Norm@50keV : 8.39868E-02 ( -0.0360594 0.0744064 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.60 using 59 PHA bins.
# Reduced chi-squared = 1.332 for 56 degrees of freedom
# Null hypothesis probability = 4.890885e-02
Photon flux (15-150 keV) in 1 sec: 4.45273 ( -0.29871 0.29893 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.7664e-07 ( -2.1946e-08 2.2197e-08 ) ergs/cm2
Band function
Time interval is from -0.112 sec. to 0.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13752 ( -0.430421 0.491136 )
beta : -10.0000 ( 10 2.45137e-13 )
Epeak [keV] : 50.5374 ( -7.63744 13.6045 )
Norm@50keV : 8.39963E-02 ( -0.036077 0.0744397 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.60 using 59 PHA bins.
# Reduced chi-squared = 1.356 for 55 degrees of freedom
# Null hypothesis probability = 4.038878e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.78353e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2975 ( )
R^2/D10^2 : 1.37332 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 121.86 using 59 PHA bins.
# Reduced chi-squared = 2.1379 for 57 degrees of freedom
# Null hypothesis probability = 1.299873e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.680e-08 4.070e-09
25- 50 1.076e-07 7.645e-09
50-150 7.918e-08 1.217e-08
15-150 2.236e-07 1.600e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 81.1598 (-14.3804 19.6132)
Norm : 21.4990 (-1.99033 2.2182)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.89 using 59 PHA bins.
# Reduced chi-squared = 1.314 for 57 degrees of freedom
# Null hypothesis probability = 5.617664e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.584e-08 4.850e-09
25- 50 9.223e-08 5.875e-09
50-150 1.315e-07 2.080e-08
15-150 2.795e-07 2.345e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.28542 (-1.14939 1.26736)
R1^2/D10^2 : 8.10452 (-3.69221 8.38232)
kT2 [keV] : 19.6148 (-3.34555 5.37622)
R2^2/D10^2 : 0.117597 (-0.0750102 0.152733)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.73 using 59 PHA bins.
# Reduced chi-squared = 1.322 for 55 degrees of freedom
# Null hypothesis probability = 5.488963e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.413e-08 1.544e-08
25- 50 9.316e-08 2.129e-08
50-150 1.284e-07 5.415e-08
15-150 2.757e-07 7.695e-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: 1.91452 ( -0.117233 0.120216 )
Norm@50keV : 1.82122E-02 ( -0.00132707 0.00131045 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.87 using 59 PHA bins.
# Reduced chi-squared = 0.8749 for 57 degrees of freedom
# Null hypothesis probability = 7.372562e-01
Photon flux (15-150 keV) in 2.236 sec: 2.62989 ( -0.171017 0.17124 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.74452e-07 ( -2.66858e-08 2.68736e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74737 ( -0.455013 0.396459 )
Epeak [keV] : 69.7961 ( -58.3436 -69.7961 )
Norm@50keV : 2.24113E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.41 using 59 PHA bins.
# Reduced chi-squared = 0.8823 for 56 degrees of freedom
# Null hypothesis probability = 7.208191e-01
Photon flux (15-150 keV) in 2.236 sec: 2.60897 ( -0.1783 0.17832 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.69477e-07 ( -2.96315e-08 2.96359e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.74744 ( 1.764 0.447353 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 69.7885 ( -30.0886 -69.7885 )
Norm@50keV : 2.24046E-02 ( -0.00540192 0.0165209 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.41 using 59 PHA bins.
# Reduced chi-squared = 0.8984 for 55 degrees of freedom
# Null hypothesis probability = 6.872485e-01
Photon flux (15-150 keV) in 2.236 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) = 1.10e-07
S(50-100 keV) = 1.16e-07
T90 vs. Hardness ratio plot
T90 = 1.7320000231266 sec.
Hardness ratio (energy fluence ratio) = 1.05455
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.08336
Count Ratio (50-100 keV) / (15-25 keV) = 0.630927
Mask shadow pattern
IMX = -8.652968683331717E-02, IMY = 5.635253212181688E-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:
-511.295400 -489.616200
-239.696000 -0.148000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4197 35.3355 3.4 40.5 66.3 2.4066 3.4 1.9 Her X-1
299.5989 35.2059 0.5 41.1 9.0 7.3578 24.1 0.5 Cyg X-1
308.2994 40.8282 0.0 37.0 -3.5 -0.2711 -1.2 11.4 Cyg X-3
326.2742 38.4665 13.8 43.1 -23.2 0.2429 0.8 9.9 Cyg X-2
269.0112 31.0455 2.3 43.7 47.5 3.0846 5.1 ------ UNKNOWN
149.4602 44.2955 2.7 55.8 175.3 3.6296 4.3 ------ UNKNOWN
302.3640 35.6573 3.1 41.1 5.5 1.0034 3.8 ------ UNKNOWN
45.4018 69.6176 2.6 32.5 -110.3 1.2106 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.148000 2.088000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4935 35.1853 9.0 40.6 66.2 -0.0668 -1.3 9.6 Her X-1
299.6018 35.0488 5.8 41.3 9.0 -0.0532 -2.0 9.2 Cyg X-1
307.9693 40.8647 6.5 36.9 -3.1 0.0394 1.8 8.3 Cyg X-3
326.1705 38.3231 149.3 43.2 -23.1 -0.0022 -0.1 0.1 Cyg X-2
244.3497 79.8299 1.9 8.4 -178.0 0.0870 6.1 ------ UNKNOWN
26.5117 69.4687 0.4 29.7 -98.7 0.7116 26.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
206.404590 962.365600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.0334 40.9714 4.3 48.2 16.2 2.6308 2.7 3.7 Cyg X-3
326.2266 38.2899 16.0 44.2 -2.8 0.5206 0.7 3.2 Cyg X-2
156.9851 59.3347 2.5 46.4 131.8 7.5778 4.6 ------ UNKNOWN
73.4607 72.4915 2.7 15.1 156.6 1.4041 4.2 ------ UNKNOWN
113.1271 34.3081 4.7 57.0 179.0 7.3721 2.9 ------ UNKNOWN
112.8517 34.2641 5.7 56.9 179.2 7.0564 2.8 ------ UNKNOWN
7.3002 51.6128 2.6 20.0 -44.0 1.7434 4.5 ------ UNKNOWN
341.9810 20.0293 3.8 56.3 -28.2 6.5089 3.0 ------ UNKNOWN
71.5428 25.6683 4.2 51.0 -135.7 7.8885 2.8 ------ UNKNOWN
Plot creation:
Sun May 31 07:45:56 EDT 2015