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Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
293.3251 -34.3196 0.0384 10.1 33.3 0.0665 5.0 TRIG_00419015
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-54.139 -54.105 (delta_t = 0.035 [sec])
-17.240 -10.240 (delta_t = 7.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 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)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of 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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.411068 ( -1.81168 0.899519 )
Norm@50keV : 1.60680E-03 ( -0.00160725 0.00127694 )
------------------------------------------------------------
# Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8103 for 57 degrees of freedom
# Null hypothesis probability = 8.464231e-01
Photon flux (15-150 keV) in 1.024 sec: 0.257963 ( -0.202031 0.118508 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85001e-08 ( -1.57861e-08 1.58038e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98200 ( )
Epeak [keV] : 124.451 ( -30.9442 71.7006 )
Norm@50keV : 2.49210E-02 ( -0.024921 0.0245996 )
------------------------------------------------------------
# Chi-Squared = 43.53 using 59 PHA bins.
# Reduced chi-squared = 0.7772 for 56 degrees of freedom
# Null hypothesis probability = 8.879024e-01
Photon flux (15-150 keV) in 1.024 sec: 0.258123 ( -0.199098 0.118353 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94332e-08 ( -1.59299e-08 1.64712e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.398661 ( 0.398273 0.398273 )
beta : 0.410487 ( -0.897841 1.81607 )
Epeak [keV] : 13.6464 ( -13.641 -13.641 )
Norm@50keV : 2.86184E-03 ( 1684.47 -0.00286034 )
------------------------------------------------------------
# Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8398 for 55 degrees of freedom
# Null hypothesis probability = 7.953676e-01
Photon flux (15-150 keV) in 1.024 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] : 66.7389 (-66.736 -66.736)
R^2/D10^2 : 7.77248E-04 (-0.000777282 0.00359949)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 45.53 using 59 PHA bins.
# Reduced chi-squared = 0.7987 for 57 degrees of freedom
# Null hypothesis probability = 8.628067e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.064e-10 2.340e-10
25- 50 2.343e-09 1.762e-09
50-150 3.646e-08 2.490e-08
15-150 3.911e-08 2.439e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.999 -199.999)
Norm : 0.747149 (-0.563056 0.563055)
------------------------------------------------------------
# Chi-Squared = 57.53 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.553923e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.905e-09 1.348e-09
25- 50 3.665e-09 2.760e-09
50-150 8.037e-09 6.216e-09
15-150 1.361e-08 1.047e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.102252 (-0.102252 -0.102252)
R1^2/D10^2 : 6.85532E-03 (-0.00685268 -0.00685268)
kT2 [keV] : 63.0019 (-63.444 -63.444)
R2^2/D10^2 : 8.69280E-04 (-0.000853872 0.00352415)
------------------------------------------------------------
# Chi-Squared = 45.53 using 59 PHA bins.
# Reduced chi-squared = 0.8279 for 55 degrees of freedom
# Null hypothesis probability = 8.148149e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.409180 ( -1.80995 0.896546 )
Norm@50keV : 1.61217E-03 ( -0.00161259 0.00127598 )
------------------------------------------------------------
# Chi-Squared = 46.37 using 59 PHA bins.
# Reduced chi-squared = 0.8136 for 57 degrees of freedom
# Null hypothesis probability = 8.416919e-01
Photon flux (15-150 keV) in 1.024 sec: 0.258589 ( -0.201874 0.118412 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85783e-08 ( -1.57684e-08 1.57864e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98166 ( )
Epeak [keV] : 124.379 ( -30.8385 71.3663 )
Norm@50keV : 2.50448E-02 ( -0.0250448 0.024555 )
------------------------------------------------------------
# Chi-Squared = 43.69 using 59 PHA bins.
# Reduced chi-squared = 0.7802 for 56 degrees of freedom
# Null hypothesis probability = 8.843592e-01
Photon flux (15-150 keV) in 1.024 sec: 0.258746 ( -0.198907 0.118282 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.95035e-08 ( -1.59084e-08 1.64469e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.383453 ( 0.382711 0.382711 )
beta : 0.408793 ( -0.895981 1.81234 )
Epeak [keV] : 13.7740 ( -13.7761 -13.7761 )
Norm@50keV : 2.87119E-03 ( -0.00287137 44282.3 )
------------------------------------------------------------
# Chi-Squared = 46.37 using 59 PHA bins.
# Reduced chi-squared = 0.8431 for 55 degrees of freedom
# Null hypothesis probability = 7.897450e-01
Photon flux (15-150 keV) in 1.024 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] : 62.2931 (-62.384 -62.384)
R^2/D10^2 : 8.90737E-04 (-0.000885687 0.003499)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 45.71 using 59 PHA bins.
# Reduced chi-squared = 0.8020 for 57 degrees of freedom
# Null hypothesis probability = 8.582930e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.239e-10 2.541e-10
25- 50 2.447e-09 1.740e-09
50-150 3.620e-08 2.410e-08
15-150 3.897e-08 2.518e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.954 -199.954)
Norm : 0.749293 (-0.562521 0.56225)
------------------------------------------------------------
# Chi-Squared = 57.78 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 57 degrees of freedom
# Null hypothesis probability = 4.463246e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.911e-09 1.461e-09
25- 50 3.675e-09 2.715e-09
50-150 8.061e-09 5.806e-09
15-150 1.365e-08 9.815e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.122913 (-0.122913 -0.122913)
R1^2/D10^2 : 1.67501E-02 (-0.0167435 -0.0167435)
kT2 [keV] : 62.8591 (-63.3011 -63.3011)
R2^2/D10^2 : 8.75025E-04 (-0.000859475 0.00352215)
------------------------------------------------------------
# Chi-Squared = 45.71 using 59 PHA bins.
# Reduced chi-squared = 0.8311 for 55 degrees of freedom
# Null hypothesis probability = 8.096477e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
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: -0.411068 ( -1.81168 0.899519 )
Norm@50keV : 1.60680E-03 ( -0.00160725 0.00127694 )
------------------------------------------------------------
# Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8103 for 57 degrees of freedom
# Null hypothesis probability = 8.464231e-01
Photon flux (15-150 keV) in 1.024 sec: 0.257963 ( -0.202031 0.118508 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85001e-08 ( -1.57861e-08 1.58038e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98200 ( )
Epeak [keV] : 124.451 ( -30.9442 71.7006 )
Norm@50keV : 2.49210E-02 ( -0.024921 0.0245996 )
------------------------------------------------------------
# Chi-Squared = 43.53 using 59 PHA bins.
# Reduced chi-squared = 0.7772 for 56 degrees of freedom
# Null hypothesis probability = 8.879024e-01
Photon flux (15-150 keV) in 1.024 sec: 0.258123 ( -0.199059 0.118376 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94332e-08 ( -1.59299e-08 1.64712e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.398661 ( 0.398273 0.398273 )
beta : 0.410487 ( -0.897841 1.81607 )
Epeak [keV] : 13.6464 ( -13.641 -13.641 )
Norm@50keV : 2.86184E-03 ( 1684.47 -0.00286034 )
------------------------------------------------------------
# Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8398 for 55 degrees of freedom
# Null hypothesis probability = 7.953676e-01
Photon flux (15-150 keV) in 1.024 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) = 2.21935e-09
S(50-100 keV) = 1.18065e-08
T90 vs. Hardness ratio plot
T90 = 1.02399998903275 sec.
Hardness ratio (energy fluence ratio) = 5.3198
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = -0.193162
Count Ratio (50-100 keV) / (15-25 keV) = 7.02951
Mask shadow pattern
IMX = 1.492324766306893E-01, IMY = -9.792494225213652E-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:
-54.139410 -54.104800
-17.240000 -10.240000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.9477 -37.8176 221.3 37.7 71.1 -0.0054 -0.1 2.4 4U 1700-377
256.4279 -36.4220 282.1 37.1 73.3 -0.0041 -0.0 0.4 GX 349+2
262.9756 -24.7751 22.5 31.6 94.1 0.0329 0.5 2.5 GX 1+4
264.9298 -44.6059 17.7 33.1 56.5 0.0394 0.6 12.3 4U 1735-44
268.2355 -1.3892 7.6 37.1 136.2 0.1032 1.5 8.8 SW J1753.5-0127
270.4174 -25.2001 3.2 24.8 94.9 0.1916 3.6 10.2 GX 5-1
270.4663 -25.8801 0.0 24.7 93.3 -0.0415 -0.8 12.1 GRS 1758-258
274.0134 -14.1766 8.8 24.9 122.5 0.0561 1.3 8.4 GX 17+2
276.0670 -30.2250 16.5 20.0 81.2 -0.0291 -0.7 11.3 H1820-303
285.1049 -24.9573 3.1 11.6 98.8 0.1315 3.7 4.3 HT1900.1-2455
288.8013 10.9315 3.1 37.0 176.3 0.1772 3.7 0.9 GRS 1915+105
300.0648 29.8896 2.8 54.9 -166.4 0.4746 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.000000 1.024000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.1700 -37.7579 6.2 37.5 71.1 -0.0775 -1.8 10.1 4U 1700-377
256.4262 -36.4493 8.9 37.1 73.2 0.0535 1.3 1.6 GX 349+2
262.8551 -24.6101 0.0 31.7 94.4 0.0326 1.2 11.7 GX 1+4
264.8129 -44.4866 6.0 33.1 56.8 0.0511 1.9 3.7 4U 1735-44
268.4194 -1.3041 97.5 37.0 136.5 -0.0031 -0.1 9.4 SW J1753.5-0127
270.1982 -24.9431 21.3 25.1 95.5 0.0108 0.5 9.4 GX 5-1
270.3753 -25.7778 26.2 24.8 93.5 0.0089 0.4 4.5 GRS 1758-258
274.0052 -14.0391 587.5 25.0 122.8 -0.0004 -0.0 0.2 GX 17+2
275.8686 -30.2263 4.7 20.2 81.3 0.0398 2.4 8.9 H1820-303
285.1265 -25.0021 12.8 11.6 98.6 -0.0129 -0.9 6.9 HT1900.1-2455
288.7536 10.8913 7.2 37.0 176.2 -0.0302 -1.6 4.2 GRS 1915+105
285.0854 19.8253 2.4 46.5 174.6 0.1464 4.9 ------ UNKNOWN
310.0289 2.1573 2.5 29.6 -143.6 0.0695 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
45.560600 101.460000
102.760000 122.760000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.9338 -37.7801 8.6 30.2 81.7 1.9300 1.3 4.6 4U 1700-377
256.5119 -36.3039 10.2 29.9 84.8 -1.6094 -1.1 8.0 GX 349+2
263.1509 -24.8886 0.0 27.7 111.0 1.3906 1.0 11.5 GX 1+4
264.6766 -44.3710 10.7 24.2 66.1 -1.2261 -1.1 5.5 4U 1735-44
268.3112 -1.4511 5.7 40.3 148.5 3.4124 2.0 3.4 SW J1753.5-0127
270.2725 -24.9375 32.8 22.0 118.3 0.3367 0.4 8.5 GX 5-1
270.3325 -25.6692 4.9 21.6 116.7 -2.2425 -2.3 4.7 GRS 1758-258
274.1003 -14.1747 7.8 26.6 143.8 -1.5330 -1.5 10.0 GX 17+2
275.9847 -30.2902 3.4 15.2 109.9 -3.3464 -3.4 5.5 H1820-303
285.0232 -24.9170 30.1 11.8 149.7 -0.3398 -0.4 0.7 HT1900.1-2455
288.6965 10.9068 365.1 45.4 -177.1 0.0524 0.0 6.4 GRS 1915+105
282.3631 6.5085 2.3 42.1 172.9 7.6967 5.0 ------ UNKNOWN
283.0107 18.8773 3.6 54.1 177.2 14.1198 3.2 ------ UNKNOWN
Plot creation:
Sun Apr 11 14:27:34 EDT 2010