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
326.7640 26.2147 0.0177 13.7748 -167.8239 0.1590546 10.880 TRIG_00585149
Foreground time interval of the image:
0.076 1.588 (delta_t = 1.512 [sec])
Background time interval of the image:
-239.024 0.076 (delta_t = 239.100 [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)
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 0.076 sec. to 1.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.23046 ( -0.313109 0.349509 )
Norm@50keV : 4.95524E-03 ( -0.00118635 0.0011448 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.33 using 59 PHA bins.
# Reduced chi-squared = 0.8655 for 57 degrees of freedom
# Null hypothesis probability = 7.548599e-01
Photon flux (15-150 keV) in 1.512 sec: 0.833720 ( -0.126283 0.126293 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.07605e-08 ( -1.37796e-08 1.4421e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.076 sec. to 1.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.39523 ( )
Epeak [keV] : 158.455 ( )
Norm@50keV : 3.99158E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.14 using 59 PHA bins.
# Reduced chi-squared = 0.8774 for 56 degrees of freedom
# Null hypothesis probability = 7.301907e-01
Photon flux (15-150 keV) in 1.512 sec: 0.833402 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.04401e-08 ( -1.42789e-08 1.47387e-08 ) ergs/cm2
Band function
Time interval is from 0.076 sec. to 1.588 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.99226 -4.99226 )
beta : -2.29613 ( -0.53379 0.338826 )
Epeak [keV] : 17.8603 ( -17.2702 5.9731 )
Norm@50keV : 9737.51 ( -1469.42 1.23899e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.95 using 59 PHA bins.
# Reduced chi-squared = 0.8900 for 55 degrees of freedom
# Null hypothesis probability = 7.036640e-01
Photon flux (15-150 keV) in 1.512 sec: 0.833400 ( 6.1666 -0.12623 ) 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] : 7.21404 (-1.44317 1.83449)
R^2/D10^2 : 1.33414 (-0.79257 2.01539)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.09 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 57 degrees of freedom
# Null hypothesis probability = 2.419181e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.738e-08 5.346e-09
25- 50 2.522e-08 6.902e-09
50-150 4.654e-09 2.464e-09
15-150 4.725e-08 1.074e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 44.6126 (-16.7779 34.1085)
Norm : 4.98848 (-1.34183 2.13306)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.99 using 59 PHA bins.
# Reduced chi-squared = 0.9122 for 57 degrees of freedom
# Null hypothesis probability = 6.629160e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.791e-08 3.723e-09
25- 50 2.465e-08 5.519e-09
50-150 2.140e-08 9.898e-09
15-150 6.397e-08 1.412e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.67189 (-1.21178 1.50012)
R1^2/D10^2 : 6.70886 (-4.57289 7.94811)
kT2 [keV] : 21.3208 (-8.20256 22.3277)
R2^2/D10^2 : 1.42660E-02 (-0.012808 0.0755061)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.99 using 59 PHA bins.
# Reduced chi-squared = 0.8726 for 55 degrees of freedom
# Null hypothesis probability = 7.371689e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.049e-08 1.154e-08
25- 50 1.981e-08 1.052e-08
50-150 3.268e-08 1.969e-08
15-150 7.299e-08 3.970e-08
Peak spectrum fit
Power-law model
Time interval is from 0.172 sec. to 1.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.23226 ( -0.336411 0.380537 )
Norm@50keV : 5.38541E-03 ( -0.00143247 0.00138874 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.21 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 57 degrees of freedom
# Null hypothesis probability = 1.889799e-01
Photon flux (15-150 keV) in 1 sec: 0.906968 ( -0.154364 0.154395 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08761e-08 ( -1.10704e-08 1.16483e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.172 sec. to 1.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97739 ( )
Epeak [keV] : 3.55090 ( )
Norm@50keV : 7.65208E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.32 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 56 degrees of freedom
# Null hypothesis probability = 1.628637e-01
Photon flux (15-150 keV) in 1 sec: 0.907109 ( -0.157568 0.154051 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.04198e-08 ( -1.26212e-08 1.2011e-08 ) ergs/cm2
Band function
Time interval is from 0.172 sec. to 1.172 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.64699 ( 2.64699 2.64699 )
beta : -2.23226 ( -0.380537 0.336934 )
Epeak [keV] : 3.98444 ( -3.98444 -3.98444 )
Norm@50keV : 0.731953 ( -0.194693 0.188749 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.21 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 55 degrees of freedom
# Null hypothesis probability = 1.431469e-01
Photon flux (15-150 keV) in 1 sec: 0.901859 ( ) 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] : 7.04573 (-1.3819 1.76734)
R^2/D10^2 : 1.63725 (-0.9763 2.3845)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.12 using 59 PHA bins.
# Reduced chi-squared = 1.318 for 57 degrees of freedom
# Null hypothesis probability = 5.418624e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.314e-08 4.082e-09
25- 50 1.823e-08 6.111e-09
50-150 3.093e-09 1.892e-09
15-150 3.447e-08 9.820e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 43.1070 (-16.9919 35.9869)
Norm : 5.58730 (-1.62237 2.64414)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.46 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 57 degrees of freedom
# Null hypothesis probability = 1.619125e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.314e-08 3.001e-09
25- 50 1.784e-08 4.400e-09
50-150 1.495e-08 8.603e-09
15-150 4.592e-08 1.211e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.09898 (-1.34738 1.55557)
R1^2/D10^2 : 5.15855 (-3.39486 6.05331)
kT2 [keV] : 22.9171 (-9.71919 26.8199)
R2^2/D10^2 : 1.12677E-02 (-0.0102623 0.0790599)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.15 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 55 degrees of freedom
# Null hypothesis probability = 1.864178e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.464e-08 8.185e-09
25- 50 1.511e-08 7.688e-09
50-150 2.324e-08 1.413e-08
15-150 5.298e-08 2.802e-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: 2.23046 ( -0.313109 0.349509 )
Norm@50keV : 4.95524E-03 ( -0.00118635 0.0011448 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.33 using 59 PHA bins.
# Reduced chi-squared = 0.8655 for 57 degrees of freedom
# Null hypothesis probability = 7.548599e-01
Photon flux (15-150 keV) in 1.512 sec: 0.833720 ( -0.126283 0.126293 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.07605e-08 ( -1.37796e-08 1.4421e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.39523 ( )
Epeak [keV] : 158.455 ( )
Norm@50keV : 3.99158E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.14 using 59 PHA bins.
# Reduced chi-squared = 0.8774 for 56 degrees of freedom
# Null hypothesis probability = 7.301907e-01
Photon flux (15-150 keV) in 1.512 sec: 0.833402 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.04401e-08 ( -1.42789e-08 1.47387e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.99226 -4.99226 )
beta : -2.29613 ( -0.53379 0.338826 )
Epeak [keV] : 17.8603 ( -17.2702 5.9731 )
Norm@50keV : 9737.51 ( -1469.42 1.23899e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.95 using 59 PHA bins.
# Reduced chi-squared = 0.8900 for 55 degrees of freedom
# Null hypothesis probability = 7.036640e-01
Photon flux (15-150 keV) in 1.512 sec: 0.833400 ( 6.1666 -0.12623 ) 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) = 2.26e-08
S(50-100 keV) = 1.92e-08
T90 vs. Hardness ratio plot
T90 = 1.35999995470047 sec.
Hardness ratio (energy fluence ratio) = 0.849558
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.753522
Count Ratio (50-100 keV) / (15-25 keV) = 0.453963
Mask shadow pattern
IMX = -2.396429390421482E-01, IMY = 5.170811366039454E-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:
-239.024000 0.076000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2823 35.3533 685.5 48.0 22.0 0.0114 0.0 8.6 Her X-1
268.3922 -1.4970 20.9 52.0 -29.6 0.3624 0.6 3.0 SW J1753.5-0127
288.8218 10.9649 0.9 28.6 -37.2 3.5000 13.2 1.8 GRS 1915+105
299.5899 35.2132 1.5 11.5 29.8 1.6244 7.6 0.7 Cyg X-1
308.0879 40.9509 1.1 11.3 75.6 2.2732 10.1 1.0 Cyg X-3
326.0071 38.3209 8.2 14.4 140.8 0.3163 1.4 7.7 Cyg X-2
323.9530 52.4656 2.3 24.2 108.1 1.5176 5.0 ------ UNKNOWN
258.9432 31.7826 2.8 44.9 16.1 1.8256 4.1 ------ UNKNOWN
255.0908 25.6421 2.6 49.8 9.3 2.7224 4.4 ------ UNKNOWN
261.4971 26.3331 2.5 44.1 7.8 1.8100 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.076000 1.588000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5009 35.4477 3.7 47.8 22.1 0.1348 3.1 6.7 Her X-1
268.5054 -1.4368 4.4 51.8 -29.7 -0.1138 -2.6 8.3 SW J1753.5-0127
288.8396 10.9682 6.6 28.6 -37.2 0.0316 1.7 2.8 GRS 1915+105
299.4027 35.2333 17.3 11.6 29.6 0.0096 0.7 9.4 Cyg X-1
308.0079 41.0996 6.3 11.5 75.5 -0.0287 -1.8 10.0 Cyg X-3
326.3828 38.4434 0.0 14.7 141.0 -0.0179 -1.1 12.3 Cyg X-2
267.3888 53.0590 1.8 39.5 48.4 0.2229 6.4 ------ UNKNOWN
313.2394 60.3281 2.1 30.3 91.2 0.1380 5.4 ------ UNKNOWN
326.7640 26.2147 1.1 13.8 -167.8 0.1590 10.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
50.876600 963.026200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.7975 10.9371 0.9 38.9 -35.3 12.6364 13.3 0.5 GRS 1915+105
299.5972 35.1897 1.2 24.9 8.3 6.5042 9.7 0.8 Cyg X-1
308.1038 40.9674 0.8 21.3 29.0 9.3281 13.7 0.9 Cyg X-3
326.1380 38.2304 4.7 12.0 68.3 -1.4258 -2.4 5.7 Cyg X-2
279.5364 60.6471 4.9 46.9 41.1 6.7762 2.4 ------ UNKNOWN
272.0986 18.2604 3.1 50.9 -16.6 5.0836 3.7 ------ UNKNOWN
266.6173 15.3665 3.8 56.8 -17.7 7.6670 3.0 ------ UNKNOWN
319.0853 -14.2760 5.6 41.2 -98.1 8.4250 2.1 ------ UNKNOWN
Plot creation:
Sat May 30 14:34:31 EDT 2015