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
184.6412 -38.2813 0.0158 20.1521 -92.3035 0.0561092 12.198 TRIG_00292004
Foreground time interval of the image:
-0.004 0.040 (delta_t = 0.044 [sec])
Background time interval of the image:
-239.932 -0.004 (delta_t = 239.928 [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 0.032000
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 0.032000
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 0.032000
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 -0.004 sec. to 0.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.750084 ( -0.28065 0.26986 )
Norm@50keV : 7.33989E-02 ( -0.0111179 0.0110269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.55 using 59 PHA bins.
# Reduced chi-squared = 0.9395 for 57 degrees of freedom
# Null hypothesis probability = 6.052387e-01
Photon flux (15-150 keV) in 0.044 sec: 8.45539 ( -1.2537 1.25432 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85552e-08 ( -6.59098e-09 6.64796e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.742575 ( -0.835962 0.346429 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 7.39459E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.57 using 59 PHA bins.
# Reduced chi-squared = 0.9565 for 56 degrees of freedom
# Null hypothesis probability = 5.675645e-01
Photon flux (15-150 keV) in 0.044 sec: 8.45450 ( -1.25244 1.25279 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83841e-08 ( -6.41898e-09 1.00203e-08 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.912139 ( 0.912139 0.912139 )
beta : -0.750088 ( -0.269856 0.280647 )
Epeak [keV] : 15.5788 ( -15.5788 -15.5788 )
Norm@50keV : 0.103432 ( -0.0409428 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.55 using 59 PHA bins.
# Reduced chi-squared = 0.9737 for 55 degrees of freedom
# Null hypothesis probability = 5.301264e-01
Photon flux (15-150 keV) in 0.044 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] : 26.7624 (-5.24303 7.53015)
R^2/D10^2 : 0.178954 (-0.0891929 0.15602)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.63 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 57 degrees of freedom
# Null hypothesis probability = 3.141652e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.438e-10 3.069e-10
25- 50 5.537e-09 1.432e-09
50-150 2.903e-08 8.292e-09
15-150 3.551e-08 9.255e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 30.4999 (-4.92943 4.92943)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.30 using 59 PHA bins.
# Reduced chi-squared = 1.321 for 57 degrees of freedom
# Null hypothesis probability = 5.262808e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.322e-09 1.888e-09
25- 50 6.390e-09 3.650e-09
50-150 1.401e-08 8.089e-09
15-150 2.373e-08 1.349e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.09406 (-2.18843 4.71705)
R1^2/D10^2 : 39.0447 (-36.9062 3274.26)
kT2 [keV] : 32.5088 (-7.72654 17.4883)
R2^2/D10^2 : 9.79164E-02 (-0.0674698 0.081746)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.70 using 59 PHA bins.
# Reduced chi-squared = 0.9582 for 55 degrees of freedom
# Null hypothesis probability = 5.628885e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.424e-09 1.206e-09
25- 50 4.984e-09 1.822e-09
50-150 3.106e-08 1.254e-08
15-150 3.847e-08 1.410e-08
Peak spectrum fit
Power-law model
Time interval is from -0.480 sec. to 0.520 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.961571 ( -0.592194 0.540749 )
Norm@50keV : 4.69875E-03 ( -0.00132249 0.00128231 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.75 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 57 degrees of freedom
# Null hypothesis probability = 1.996795e-01
Photon flux (15-150 keV) in 1 sec: 0.540026 ( -0.150358 0.151303 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.1529e-08 ( -1.53769e-08 1.5605e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.480 sec. to 0.520 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.966704 ( -0.608093 0.534241 )
Epeak [keV] : 9999.33 ( -9999.36 -9999.36 )
Norm@50keV : 4.73252E-03 ( -0.00128727 0.0165685 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.76 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 56 degrees of freedom
# Null hypothesis probability = 1.747238e-01
Photon flux (15-150 keV) in 1 sec: 0.542066 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.15345e-08 ( -1.53615e-08 1.54012e-08 ) ergs/cm2
Band function
Time interval is from -0.480 sec. to 0.520 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.861971 ( 0.861866 0.861866 )
beta : -0.961526 ( 0.9615 0.592231 )
Epeak [keV] : 23.5354 ( -23.6769 -23.6769 )
Norm@50keV : 7.13071E-03 ( -0.00368878 0.094068 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.75 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 55 degrees of freedom
# Null hypothesis probability = 1.520662e-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] : 26.4611 (-8.65556 18.3268)
R^2/D10^2 : 1.08470E-02 (-0.0108458 0.0254178)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.02 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 57 degrees of freedom
# Null hypothesis probability = 1.320745e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.279e-09 8.125e-10
25- 50 7.463e-09 4.476e-09
50-150 3.835e-08 2.381e-08
15-150 4.710e-08 2.845e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.19548 (-0.619814 0.619788)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.52 using 59 PHA bins.
# Reduced chi-squared = 1.220 for 57 degrees of freedom
# Null hypothesis probability = 1.234298e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.469e-09 3.324e-09
25- 50 1.052e-08 6.445e-09
50-150 2.307e-08 1.422e-08
15-150 3.907e-08 2.327e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.13060 (-2.76543 4.81825)
R1^2/D10^2 : 4.07109 (-3.93466 6967.59)
kT2 [keV] : 33.4045 (-12.2744 49.5616)
R2^2/D10^2 : 5.21124E-03 (-0.00459152 0.00805416)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.96 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 55 degrees of freedom
# Null hypothesis probability = 1.908111e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.166e-09 3.054e-09
25- 50 7.169e-09 3.788e-09
50-150 4.099e-08 2.503e-08
15-150 5.333e-08 2.897e-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: 0.750084 ( -0.28065 0.26986 )
Norm@50keV : 7.33989E-02 ( -0.0111179 0.0110269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.55 using 59 PHA bins.
# Reduced chi-squared = 0.9395 for 57 degrees of freedom
# Null hypothesis probability = 6.052387e-01
Photon flux (15-150 keV) in 0.044 sec: 8.45539 ( -1.2537 1.25432 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85552e-08 ( -6.59098e-09 6.64796e-09 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.742575 ( -0.835962 0.346429 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 7.39459E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.57 using 59 PHA bins.
# Reduced chi-squared = 0.9565 for 56 degrees of freedom
# Null hypothesis probability = 5.675645e-01
Photon flux (15-150 keV) in 0.044 sec: 8.45450 ( -1.25244 1.25279 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83841e-08 ( -6.41898e-09 1.00203e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.912139 ( 0.912139 0.912139 )
beta : -0.750088 ( -0.269856 0.280647 )
Epeak [keV] : 15.5788 ( -15.5788 -15.5788 )
Norm@50keV : 0.103432 ( -0.0409428 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.55 using 59 PHA bins.
# Reduced chi-squared = 0.9737 for 55 degrees of freedom
# Null hypothesis probability = 5.301264e-01
Photon flux (15-150 keV) in 0.044 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) = 6.00e-09
S(50-100 keV) = 1.43e-08
T90 vs. Hardness ratio plot
T90 = 0.0399999916553497 sec.
Hardness ratio (energy fluence ratio) = 2.38333
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.58996
Count Ratio (50-100 keV) / (15-25 keV) = 2.5171
Mask shadow pattern
IMX = -1.474964381518899E-02, IMY = 3.666820475980682E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
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:
-239.932000 -0.004000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5232 -40.5447 1.0 42.6 -156.4 2.2928 11.4 0.6 Vela X-1
169.9843 -60.4931 0.0 15.1 -178.0 0.1359 1.1 12.5 Cen X-3
186.3947 -62.7432 3.9 8.6 157.0 0.3225 3.0 7.4 GX 301-2
244.9706 -15.6419 1.1 54.0 -0.1 4.8682 10.1 0.5 Sco X-1
255.9559 -37.7911 11.6 42.1 28.5 0.2586 1.0 3.5 4U 1700-377
256.3895 -36.4185 12.3 43.3 27.4 -0.2852 -0.9 2.2 GX 349+2
264.5875 -44.3241 9.5 42.4 42.2 0.4246 1.2 10.1 4U 1735-44
262.9772 -33.8859 7.5 48.8 30.6 0.9205 1.5 3.1 GX 354-0
324.3382 -85.7918 2.5 36.2 113.5 1.2767 4.6 ------ UNKNOWN
258.3404 -35.7700 3.4 44.9 28.4 1.0500 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.004000 0.040000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5366 -40.4354 7.8 42.7 -156.2 0.0096 1.5 7.2 Vela X-1
170.4052 -60.7639 1013.0 14.9 -179.1 0.0000 0.0 8.9 Cen X-3
186.4171 -62.6512 18.5 8.5 157.5 -0.0024 -0.6 9.7 GX 301-2
245.0241 -15.6529 13.5 54.0 -0.1 0.0138 0.9 2.7 Sco X-1
255.9493 -37.8368 2.9 42.1 28.5 0.0324 4.0 1.8 4U 1700-377
256.5099 -36.4057 4.9 43.4 27.5 0.0210 2.3 3.7 GX 349+2
264.7434 -44.4847 12.6 42.3 42.5 0.0091 0.9 2.1 4U 1735-44
263.0294 -33.8957 4.7 48.9 30.6 0.0364 2.4 4.2 GX 354-0
113.2122 -61.3184 2.1 41.0 166.1 0.0360 5.4 ------ UNKNOWN
244.0632 -11.8923 2.5 56.8 -3.3 0.1028 4.6 ------ UNKNOWN
184.6412 -38.2812 0.9 20.2 -92.3 0.0561 12.2 ------ UNKNOWN
214.9528 -5.3493 2.7 52.8 -39.3 0.0855 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
Plot creation:
Sun May 31 09:13:07 EDT 2015