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
228.7358 -24.2789 0.0142 41.8157 -8.4833 0.3389504 13.477 TRIG_00290843
Foreground time interval of the image:
-1.584 1.292 (delta_t = 2.876 [sec])
Background time interval of the image:
-239.208 -1.584 (delta_t = 237.624 [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)
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 -1.584 sec. to 1.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41195 ( -0.240885 0.239301 )
Norm@50keV : 6.11105E-03 ( -0.0009461 0.000945247 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.49 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 57 degrees of freedom
# Null hypothesis probability = 1.612000e-01
Photon flux (15-150 keV) in 2.876 sec: 0.746337 ( -0.118926 0.119288 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69411e-07 ( -2.79359e-08 2.81956e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.584 sec. to 1.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.724729 ( -2.14218 1.40332 )
Epeak [keV] : 62.3014 ( -11.6058 30.6109 )
Norm@50keV : 7.44782E-02 ( -0.0744879 0.819108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.50 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 56 degrees of freedom
# Null hypothesis probability = 3.494977e-01
Photon flux (15-150 keV) in 2.876 sec: 0.695263 ( -0.123743 0.124237 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48223e-07 ( -2.9865e-08 3.15431e-08 ) ergs/cm2
Band function
Time interval is from -1.584 sec. to 1.292 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.721856 ( -0.612229 1.302 )
beta : -10.00000 ( 10 8.78166e-07 )
Epeak [keV] : 62.3265 ( -10.0969 30.6548 )
Norm@50keV : 7.42135E-02 ( -0.0110581 0.816422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.50 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 55 degrees of freedom
# Null hypothesis probability = 3.152863e-01
Photon flux (15-150 keV) in 2.876 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54999e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.9876 (-2.13013 2.61697)
R^2/D10^2 : 9.34689E-02 (-0.0412616 0.0682733)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.19 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 57 degrees of freedom
# Null hypothesis probability = 3.611879e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.264e-08 3.858e-09
25- 50 5.020e-08 1.247e-08
50-150 7.672e-08 2.061e-08
15-150 1.396e-07 2.968e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-79.0366 -199.363)
Norm : 3.13407 (-0.479942 0.479922)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.94 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 57 degrees of freedom
# Null hypothesis probability = 1.952080e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.244e-08 1.287e-08
25- 50 4.317e-08 2.412e-08
50-150 9.469e-08 5.272e-08
15-150 1.603e-07 8.998e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 13.0551 (-13.0486 3.29799)
R1^2/D10^2 : 0.134683 (-0.134824 -0.134824)
kT2 [keV] : 71.4935 (-70.8866 -70.8866)
R2^2/D10^2 : 2.54917E-04 (-0.000260149 0.122943)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.15 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 55 degrees of freedom
# Null hypothesis probability = 3.600768e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.431e-08 7.261e-09
25- 50 5.080e-08 2.846e-08
50-150 9.087e-08 4.758e-08
15-150 1.560e-07 8.349e-08
Peak spectrum fit
Power-law model
Time interval is from -0.260 sec. to 0.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26371 ( -0.350505 0.336012 )
Norm@50keV : 7.53603E-03 ( -0.00161782 0.00161598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.56 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 57 degrees of freedom
# Null hypothesis probability = 1.809910e-01
Photon flux (15-150 keV) in 1 sec: 0.893363 ( -0.200938 0.202652 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.51504e-08 ( -1.68375e-08 1.69678e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.260 sec. to 0.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.174524 ( -2.81028 1.54451 )
Epeak [keV] : 78.6496 ( -24.9305 -78.5642 )
Norm@50keV : 3.78623E-02 ( -0.0380244 0.900602 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.18 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 56 degrees of freedom
# Null hypothesis probability = 2.118106e-01
Photon flux (15-150 keV) in 1 sec: 0.854846 ( -0.205206 0.207244 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.95092e-08 ( -1.90522e-08 1.8657e-08 ) ergs/cm2
Band function
Time interval is from -0.260 sec. to 0.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.176277 ( 0.282707 1.4178 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 78.5749 ( -21.0059 -78.5749 )
Norm@50keV : 3.79639E-02 ( -0.00796066 0.898794 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.18 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 55 degrees of freedom
# Null hypothesis probability = 1.858698e-01
Photon flux (15-150 keV) in 1 sec: 0.826387 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.02394e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.6755 (-3.46576 4.97752)
R^2/D10^2 : 7.87271E-02 (-0.0472861 0.0989848)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.26 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 57 degrees of freedom
# Null hypothesis probability = 2.116446e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.482e-09 1.972e-09
25- 50 1.952e-08 8.260e-09
50-150 3.851e-08 1.594e-08
15-150 6.252e-08 2.158e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.80287 (-0.82151 0.821402)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.66 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 57 degrees of freedom
# Null hypothesis probability = 1.576796e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.475e-09 5.750e-09
25- 50 1.823e-08 1.070e-08
50-150 3.997e-08 2.279e-08
15-150 6.767e-08 3.965e-08
Double BB
R1^2/D10^2 : 0.167530 ( )
kT2 [keV] : 45.0805 (-40.5285 -40.5285)
R2^2/D10^2 : 1.54141E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.86 using 59 PHA bins.
#Fit statistic : Chi-Squared = 62.83 using 59 PHA bins.
#Fit statistic : Chi-Squared = 62.82 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 55 degrees of freedom
# Reduced chi-squared = 1.142 for 55 degrees of freedom
# Reduced chi-squared = 1.142 for 55 degrees of freedom
# Null hypothesis probability = 2.178214e-01
# Null hypothesis probability = 2.185537e-01
# Null hypothesis probability = 2.190432e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.839e-09 3.837e-09
25- 50 2.008e-08 1.251e-08
50-150 4.640e-08 2.541e-08
15-150 7.232e-08 3.728e-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: 1.41195 ( -0.240885 0.239301 )
Norm@50keV : 6.11105E-03 ( -0.0009461 0.000945247 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.49 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 57 degrees of freedom
# Null hypothesis probability = 1.612000e-01
Photon flux (15-150 keV) in 2.876 sec: 0.746337 ( -0.118926 0.119288 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69411e-07 ( -2.79359e-08 2.81956e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.724729 ( -2.14218 1.40332 )
Epeak [keV] : 62.3014 ( -11.6058 30.6109 )
Norm@50keV : 7.44782E-02 ( -0.0744879 0.819108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.50 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 56 degrees of freedom
# Null hypothesis probability = 3.494977e-01
Photon flux (15-150 keV) in 2.876 sec: 0.695263 ( -0.123743 0.124237 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48223e-07 ( -2.9865e-08 3.15431e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.721856 ( -0.612229 1.302 )
beta : -10.00000 ( 10 8.78166e-07 )
Epeak [keV] : 62.3265 ( -10.0969 30.6548 )
Norm@50keV : 7.42135E-02 ( -0.0110581 0.816422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.50 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 55 degrees of freedom
# Null hypothesis probability = 3.152863e-01
Photon flux (15-150 keV) in 2.876 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54999e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 4.01e-08
S(50-100 keV) = 6.02e-08
T90 vs. Hardness ratio plot
T90 = 2.68399998545647 sec.
Hardness ratio (energy fluence ratio) = 1.50125
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.77835
Count Ratio (50-100 keV) / (15-25 keV) = 1.22706
Mask shadow pattern
IMX = 8.848086431628168E-01, IMY = 1.319718418351068E-01
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:
-239.208000 -1.584000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5425 -40.5520 1.7 38.2 -158.4 1.7570 6.9 0.7 Vela X-1
170.4916 -60.6249 1.9 11.8 166.1 0.9002 6.1 5.2 Cen X-3
186.7073 -62.8005 1.4 8.0 123.7 1.3142 8.1 2.3 GX 301-2
256.0428 -37.8634 4.4 46.6 29.9 1.1979 2.6 2.9 4U 1700-377
256.3456 -36.5173 6.0 47.7 28.8 1.0049 1.9 7.1 GX 349+2
264.6514 -44.4767 5.6 47.0 42.6 1.4590 2.1 4.2 4U 1735-44
99.9193 -56.8748 2.3 46.8 161.4 1.9470 4.9 ------ UNKNOWN
201.4098 -43.0386 1.9 14.0 -30.7 0.9440 6.0 ------ UNKNOWN
211.8868 -33.3116 2.0 26.5 -23.0 0.8877 5.7 ------ UNKNOWN
121.7310 -30.7616 3.0 53.1 -159.6 1.8556 3.9 ------ UNKNOWN
165.2422 -32.5457 2.2 28.4 -115.3 1.0707 5.2 ------ UNKNOWN
130.9138 -28.3742 2.9 49.6 -149.9 1.5359 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.584000 1.292000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5175 -40.5586 299.6 38.2 -158.4 0.0009 0.0 0.6 Vela X-1
170.1903 -60.5755 4.0 11.9 166.6 0.0437 2.9 4.7 Cen X-3
186.8259 -62.8478 6.4 8.1 123.3 0.0282 1.8 6.6 GX 301-2
256.1076 -38.0418 0.0 46.5 30.1 -0.0382 -0.8 13.2 4U 1700-377
256.5248 -36.3911 8.0 47.9 28.8 -0.0787 -1.5 4.7 GX 349+2
264.5559 -44.3207 10.8 47.0 42.4 -0.0777 -1.1 11.2 4U 1735-44
235.4082 -41.0435 2.2 32.7 16.8 0.1075 5.3 ------ UNKNOWN
228.7356 -24.2788 0.9 41.8 -8.5 0.3389 13.5 ------ UNKNOWN
228.6402 -12.2886 2.1 52.2 -16.7 0.2208 5.5 ------ UNKNOWN
171.4490 -19.7385 2.0 37.9 -96.4 0.2515 5.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
243.292590 962.837900
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.0962 -60.6520 4.6 32.9 -149.3 1.4427 2.5 6.7 Cen X-3
186.7145 -62.7759 1.4 24.8 -149.9 4.0521 8.0 1.6 GX 301-2
244.9817 -15.6414 0.3 40.9 -8.2 25.1070 40.2 0.1 Sco X-1
255.9802 -37.8514 0.5 22.9 24.2 9.7718 23.2 0.5 4U 1700-377
256.4609 -36.4264 1.7 24.4 23.2 3.1084 6.9 1.2 GX 349+2
263.0292 -24.7404 2.3 37.3 22.0 3.2979 5.1 1.1 GX 1+4
264.5371 -44.3962 6.8 22.1 48.2 0.8861 1.7 9.4 4U 1735-44
270.1209 -24.9223 0.0 40.2 31.1 1.3469 1.7 12.9 GX 5-1
270.2215 -25.6089 7.3 39.7 31.8 1.2378 1.6 9.2 GRS 1758-258
274.0057 -14.0364 90.1 51.5 28.3 0.2656 0.1 0.0 GX 17+2
276.0717 -30.3714 11.5 38.6 42.8 0.8167 1.0 7.6 H1820-303
263.0619 -33.8794 16.4 29.4 30.3 -0.3482 -0.7 4.5 GX 354-0
276.5792 -37.1902 2.7 33.7 50.8 2.9437 4.3 ------ UNKNOWN
218.4388 -6.6699 3.8 50.7 -44.5 7.3366 3.1 ------ UNKNOWN
196.0402 -25.5216 2.9 41.0 -82.5 9.3092 3.9 ------ UNKNOWN
Plot creation:
Sun May 31 09:19:44 EDT 2015