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Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
250.4449 -45.6053 0.0350 28.8 163.2 0.0178 5.5 TRIG_00552677
------------------------------------------
Foreground time interval of the image:
165.148 165.204 (delta_t = 0.056 [sec])
Background time interval of the image:
-14.599 165.148 (delta_t = 179.747 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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 165.148 sec. to 165.204 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.74065 ( )
Norm@50keV : 1.83343E-03 ( -0.00186796 0.0019402 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.64 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 57 degrees of freedom
# Null hypothesis probability = 4.513144e-01
Photon flux (15-150 keV) in 0.056 sec: 0.902234 ( -0.593717 0.593712 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88669e-09 ( -1.25948e-09 1.24257e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 165.148 sec. to 165.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.36932E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.73 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 56 degrees of freedom
# Null hypothesis probability = 2.232631e-01
Photon flux (15-150 keV) in 0.056 sec: 1.50932 ( -0.623441 0.64391 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.57493e-09 ( -1.51704e-09 1.60481e-09 ) ergs/cm2
Band function
Time interval is from 165.148 sec. to 165.204 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.16931 -4.98289 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 27.9997 ( -6.06928 6.12326 )
Norm@50keV : 1196.69 ( -474.732 5232.76 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.91 using 59 PHA bins.
# Reduced chi-squared = 0.8529 for 55 degrees of freedom
# Null hypothesis probability = 7.729481e-01
Photon flux (15-150 keV) in 0.056 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] : 6.35234 (-1.59507 1.37534)
R^2/D10^2 : 4.84384 (-4.7708 10.6426)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.45 using 59 PHA bins.
# Reduced chi-squared = 0.8501 for 57 degrees of freedom
# Null hypothesis probability = 7.825974e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.572e-09 9.926e-10
25- 50 1.770e-09 1.152e-09
50-150 2.037e-10 2.119e-10
15-150 3.545e-09 2.372e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.3488 (-6.14804 7.47555)
Norm : 22.6915 (-13.7936 27.5978)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.07 using 59 PHA bins.
# Reduced chi-squared = 0.9310 for 57 degrees of freedom
# Null hypothesis probability = 6.233280e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.516e-09 1.009e-09
25- 50 1.057e-09 7.868e-10
50-150 1.950e-10 2.139e-10
15-150 2.768e-09 1.992e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.43371 (-6.42986 -6.42986)
R1^2/D10^2 : 4.11989 (-4.14524 -4.14524)
kT2 [keV] : 6.38870 (-6.43139 -6.43139)
R2^2/D10^2 : 0.508071 (-0.537404 -0.537404)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.45 using 59 PHA bins.
# Reduced chi-squared = 0.8809 for 55 degrees of freedom
# Null hypothesis probability = 7.213436e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.561e-09 2.778e-02
25- 50 1.803e-09 2.113e-01
50-150 2.173e-10 5.362e+00
15-150 3.582e-09 5.687e+00
Peak spectrum fit
Power-law model
Time interval is from 164.678 sec. to 165.678 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91628 ( -1.98598 -1.98598 )
Norm@50keV : 3.60439E-04 ( -0.000356908 0.00135651 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.52 using 59 PHA bins.
# Reduced chi-squared = 0.8863 for 57 degrees of freedom
# Null hypothesis probability = 7.151300e-01
Photon flux (15-150 keV) in 1 sec: 2.36951E-02 ( -0.0236951 0.194049 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.18366e-09 ( -4.18366e-09 1.50957e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 164.678 sec. to 165.678 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.99981 ( )
Epeak [keV] : 373.066 ( )
Norm@50keV : 1.80726E-06 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.91 using 59 PHA bins.
# Reduced chi-squared = 0.8912 for 56 degrees of freedom
# Null hypothesis probability = 7.034116e-01
Photon flux (15-150 keV) in 1 sec: 7.09671E-02 ( -0.0709671 0.142838 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.84654e-18 ( 0 0 ) ergs/cm2
Band function
Time interval is from 164.678 sec. to 165.678 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.97605 -4.97605 )
beta : -0.461116 ( 9.34066 9.34066 )
Epeak [keV] : 386.833 ( -393.762 -393.762 )
Norm@50keV : 4.99950E-05 ( -4.86099e-05 0.218962 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.12 using 59 PHA bins.
# Reduced chi-squared = 0.9113 for 55 degrees of freedom
# Null hypothesis probability = 6.610651e-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] : 7.96888 (-7.80555 -7.80555)
R^2/D10^2 : 8.56536E-02 (-0.0874594 -0.0874594)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.25 using 59 PHA bins.
# Reduced chi-squared = 0.8817 for 57 degrees of freedom
# Null hypothesis probability = 7.242318e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.807e-10 7.850e-10
25- 50 1.705e-09 1.653e-09
50-150 4.420e-10 8.620e-10
15-150 3.128e-09 4.393e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.0300 (-33.407 -33.407)
Norm : 0.428011 (-0.425213 -0.425213)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.47 using 59 PHA bins.
# Reduced chi-squared = 0.8854 for 57 degrees of freedom
# Null hypothesis probability = 7.169282e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.994e-10 9.985e-10
25- 50 1.064e-09 1.067e-09
50-150 6.342e-10 2.590e-09
15-150 2.598e-09 3.547e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.12600 (-7.38962 -7.38962)
R1^2/D10^2 : 2.16193E-02 (-0.0201143 -0.0201143)
kT2 [keV] : 8.07363 (-7.99569 -7.99569)
R2^2/D10^2 : 6.87696E-02 (-0.068098 -0.068098)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.26 using 59 PHA bins.
# Reduced chi-squared = 0.9137 for 55 degrees of freedom
# Null hypothesis probability = 6.561444e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.956e-10 7.040e-05
25- 50 1.706e-09 5.725e-04
50-150 4.376e-10 1.489e-02
15-150 3.139e-09 1.505e-02
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: 3.74065 ( )
Norm@50keV : 1.83343E-03 ( -0.00186796 0.0019402 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.64 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 57 degrees of freedom
# Null hypothesis probability = 4.513144e-01
Photon flux (15-150 keV) in 0.056 sec: 0.902234 ( -0.593717 0.593712 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88669e-09 ( -1.25948e-09 1.24257e-09 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.36932E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.73 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 56 degrees of freedom
# Null hypothesis probability = 2.232631e-01
Photon flux (15-150 keV) in 0.056 sec: 1.50932 ( -0.623441 0.64391 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.57493e-09 ( -1.51704e-09 1.60481e-09 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.16931 -4.98289 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 27.9997 ( -6.06928 6.12326 )
Norm@50keV : 1196.69 ( -474.732 5232.76 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.91 using 59 PHA bins.
# Reduced chi-squared = 0.8529 for 55 degrees of freedom
# Null hypothesis probability = 7.729481e-01
Photon flux (15-150 keV) in 0.056 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) = 5.53926e-10
S(50-100 keV) = 1.68857e-10
T90 vs. Hardness ratio plot
T90 = 0.0479999184608459 sec.
Hardness ratio (energy fluence ratio) = 0.304837
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.2944
Count Ratio (50-100 keV) / (15-25 keV) = 0.1234
Mask shadow pattern
IMX = -5.269505169541323E-01, IMY = -1.593702417784803E-01
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-14.599400 165.148000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5648 -40.5475 3.5 49.8 11.6 1.5689 3.3 1.7 Vela X-1
170.4186 -60.6097 2.1 21.2 22.3 1.0411 5.6 3.1 Cen X-3
186.9766 -62.7967 6.0 13.9 34.7 0.3421 1.9 8.9 GX 301-2
255.9712 -37.8143 1.3 37.6 164.8 2.5420 9.1 1.9 4U 1700-377
256.5924 -36.4578 15.2 39.0 164.8 0.2213 0.8 7.9 GX 349+2
262.9887 -24.7173 6.4 51.9 166.6 1.2772 1.8 2.0 GX 1+4
264.5717 -44.4498 12.9 34.2 179.5 0.1963 0.9 7.3 4U 1735-44
270.3335 -25.1820 7.2 53.7 174.7 1.1079 1.6 6.7 GX 5-1
270.3102 -25.7433 8.4 53.2 174.9 0.9186 1.4 0.4 GRS 1758-258
276.0175 -30.3219 4.2 50.8 -177.0 1.2134 2.7 5.5 H1820-303
262.9317 -33.9342 4.2 43.3 170.8 0.8947 2.8 6.6 GX 354-0
123.6004 -37.3325 3.6 56.8 3.0 2.9162 3.2 ------ UNKNOWN
289.0358 -26.1628 3.5 59.1 -166.1 3.3983 3.3 ------ UNKNOWN
90.9278 -48.0147 2.4 56.3 -28.4 4.5657 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
165.148000 165.204000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5914 -40.4618 8.6 49.9 11.7 -0.0108 -1.3 6.3 Vela X-1
170.4739 -60.6990 26.8 21.1 22.2 0.0012 0.4 6.5 Cen X-3
187.0215 -62.6401 0.0 14.0 35.3 0.0068 2.5 12.7 GX 301-2
255.9624 -37.8543 9.3 37.6 164.8 -0.0054 -1.2 1.3 4U 1700-377
256.3727 -36.3709 8.4 39.1 164.5 -0.0064 -1.4 4.4 GX 349+2
263.0854 -24.8131 7.5 51.9 166.7 -0.0166 -1.5 5.8 GX 1+4
264.5657 -44.4910 4.7 34.1 179.6 -0.0081 -2.4 8.0 4U 1735-44
270.3127 -25.1127 11.6 53.8 174.6 0.0109 1.0 2.5 GX 5-1
270.1332 -25.8303 7.0 53.0 174.7 0.0183 1.8 10.5 GRS 1758-258
276.0170 -30.4061 21.9 50.7 -177.0 0.0038 0.5 5.3 H1820-303
262.9543 -33.6804 5.0 43.5 170.7 -0.0115 -2.3 9.4 GX 354-0
250.4449 -45.6053 2.1 28.8 163.2 0.0178 5.5 ------ UNKNOWN
113.7712 -43.9888 2.7 53.9 -8.7 0.0375 4.3 ------ UNKNOWN
305.2833 -43.9456 3.3 48.7 -141.8 0.0252 3.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
Plot creation:
Tue Apr 23 16:01:41 EDT 2013