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Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
258.1334 -37.6632 0.0189 19.0 153.8 0.5624 10.1 TRIG_00426405
------------------------------------------
Foreground time interval of the image:
-10.400 6.324 (delta_t = 16.724 [sec])
Background time interval of the image:
-119.688 -89.648 (delta_t = 30.040 [sec])
-88.688 -10.400 (delta_t = 78.288 [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
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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 4.096000
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 4.096000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
The mask-weighted light curves based on cleaned DPHs
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 -10.400 sec. to 6.324 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.43601 ( -0.574255 0.67102 )
Norm@50keV : 3.26005E-04 ( -0.00016124 0.000229568 )
------------------------------------------------------------
# Chi-Squared = 46.60 using 59 PHA bins.
# Reduced chi-squared = 0.8175 for 57 degrees of freedom
# Null hypothesis probability = 8.357785e-01
Photon flux (15-150 keV) in 16.72 sec: 0.296872 ( -0.0438845 0.0439117 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67646e-07 ( -2.80119e-08 2.92515e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.400 sec. to 6.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.58960E-03 ( )
------------------------------------------------------------
# Chi-Squared = 121.36 using 59 PHA bins.
# Reduced chi-squared = 2.1671 for 56 degrees of freedom
# Null hypothesis probability = 9.980399e-07
Photon flux (15-150 keV) in 16.72 sec: 0.296652 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67608e-07 ( -2.8015e-08 2.92533e-08 ) ergs/cm2
Band function
Time interval is from -10.400 sec. to 6.324 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.18999 ( 2.18999 2.18999 )
beta : -4.43814 ( -0.66899 0.576319 )
Epeak [keV] : 5.63551 ( -5.63551 -5.63551 )
Norm@50keV : 3.29074 ( -3.29073 16.8355 )
------------------------------------------------------------
# Chi-Squared = 46.60 using 59 PHA bins.
# Reduced chi-squared = 0.8472 for 55 degrees of freedom
# Null hypothesis probability = 7.827496e-01
Photon flux (15-150 keV) in 16.72 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] : 3.18798 (-0.439977 0.528486)
R^2/D10^2 : 28.1891 (-17.0218 45.0321)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 47.54 using 59 PHA bins.
# Reduced chi-squared = 0.8341 for 57 degrees of freedom
# Null hypothesis probability = 8.096262e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.273e-07 4.836e-08
25- 50 2.282e-08 1.026e-08
50-150 5.932e-11 5.497e-11
15-150 1.502e-07 6.378e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.02042 (-1.60337 2.31445)
Norm : 23.3481 (-11.8946 27.0164)
------------------------------------------------------------
# Chi-Squared = 46.73 using 59 PHA bins.
# Reduced chi-squared = 0.8199 for 57 degrees of freedom
# Null hypothesis probability = 8.321603e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.242e-07 3.841e-08
25- 50 3.098e-08 1.457e-08
50-150 6.937e-10 6.284e-10
15-150 1.558e-07 5.241e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.82233 (-1.42262 0.62227)
R1^2/D10^2 : 53.6315 (-37.2155 295.897)
kT2 [keV] : 8.85614 (-9.087 -9.087)
R2^2/D10^2 : 4.21702E-02 (-0.0402388 32.9403)
------------------------------------------------------------
# Chi-Squared = 44.93 using 59 PHA bins.
# Reduced chi-squared = 0.8168 for 55 degrees of freedom
# Null hypothesis probability = 8.318884e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.243e-07 6.629e-08
25- 50 3.543e-08 1.929e-08
50-150 8.043e-09 6.084e-09
15-150 1.677e-07 8.485e-08
Peak spectrum fit
Power-law model
Time interval is from 1.308 sec. to 2.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.39738 ( -0.826747 1.08492 )
Norm@50keV : 1.25521E-03 ( -0.00125469 0.00125792 )
------------------------------------------------------------
# Chi-Squared = 52.06 using 59 PHA bins.
# Reduced chi-squared = 0.9133 for 57 degrees of freedom
# Null hypothesis probability = 6.605310e-01
Photon flux (15-150 keV) in 1 sec: 0.467705 ( -0.152135 0.153651 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85786e-08 ( -7.19537e-09 8.58122e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.308 sec. to 2.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 7.79153E-03 ( )
------------------------------------------------------------
# Chi-Squared = 63.91 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 56 degrees of freedom
# Null hypothesis probability = 2.185964e-01
Photon flux (15-150 keV) in 1 sec: 0.484839 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61228e-08 ( -4.7648e-09 4.8573e-09 ) ergs/cm2
Band function
Time interval is from 1.308 sec. to 2.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.15636 ( 0.0251181 0.0251181 )
beta : -7.40703 ( 181.293 191.293 )
Epeak [keV] : 16.5208 ( -7.89837 8.97975 )
Norm@50keV : 346.471 ( -346.448 13235.5 )
------------------------------------------------------------
# Chi-Squared = 48.38 using 59 PHA bins.
# Reduced chi-squared = 0.8796 for 55 degrees of freedom
# Null hypothesis probability = 7.237791e-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] : 4.11919 (-0.907334 1.13696)
R^2/D10^2 : 11.0699 (-7.86751 29.7958)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 48.81 using 59 PHA bins.
# Reduced chi-squared = 0.8563 for 57 degrees of freedom
# Null hypothesis probability = 7.715899e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.159e-08 7.140e-09
25- 50 4.545e-09 2.970e-09
50-150 6.579e-11 7.055e-11
15-150 1.620e-08 9.780e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.7007 (-4.17229 9.03817)
Norm : 14.2598 (-8.71691 26.1138)
------------------------------------------------------------
# Chi-Squared = 50.72 using 59 PHA bins.
# Reduced chi-squared = 0.8897 for 57 degrees of freedom
# Null hypothesis probability = 7.083911e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.076e-08 6.700e-09
25- 50 5.060e-09 3.555e-09
50-150 4.153e-10 4.494e-10
15-150 1.623e-08 9.985e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.99962 (-0.901452 1.13294)
R1^2/D10^2 : 12.4868 (-8.96314 35.5221)
kT2 [keV] : 36.8570 (-37.6454 -37.6454)
R2^2/D10^2 : 6.70810E-04 (-0.000626498 30.7068)
------------------------------------------------------------
# Chi-Squared = 47.83 using 59 PHA bins.
# Reduced chi-squared = 0.8696 for 55 degrees of freedom
# Null hypothesis probability = 7.427871e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.148e-08 6.700e-09
25- 50 4.926e-09 2.910e-09
50-150 7.180e-09 5.940e-09
15-150 2.358e-08 1.444e-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: 4.43601 ( -0.574255 0.67102 )
Norm@50keV : 3.26005E-04 ( -0.00016124 0.000229568 )
------------------------------------------------------------
# Chi-Squared = 46.60 using 59 PHA bins.
# Reduced chi-squared = 0.8175 for 57 degrees of freedom
# Null hypothesis probability = 8.357785e-01
Photon flux (15-150 keV) in 16.72 sec: 0.296872 ( -0.0438845 0.0439117 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67646e-07 ( -2.80119e-08 2.92515e-08 ) 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 : 3.58960E-03 ( )
------------------------------------------------------------
# Chi-Squared = 121.36 using 59 PHA bins.
# Reduced chi-squared = 2.1671 for 56 degrees of freedom
# Null hypothesis probability = 9.980399e-07
Photon flux (15-150 keV) in 16.72 sec: 0.296652 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67608e-07 ( -2.8015e-08 2.92533e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.18999 ( 2.18999 2.18999 )
beta : -4.43814 ( -0.66899 0.576319 )
Epeak [keV] : 5.63551 ( -5.63551 -5.63551 )
Norm@50keV : 3.29074 ( -3.29073 16.8355 )
------------------------------------------------------------
# Chi-Squared = 46.60 using 59 PHA bins.
# Reduced chi-squared = 0.8472 for 55 degrees of freedom
# Null hypothesis probability = 7.827496e-01
Photon flux (15-150 keV) in 16.72 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) = 3.9491e-08
S(50-100 keV) = 7.28704e-09
T90 vs. Hardness ratio plot
T90 = 15.1279999017715 sec.
Hardness ratio (energy fluence ratio) = 0.184524
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.19179
Count Ratio (50-100 keV) / (15-25 keV) = 0.00346692
Mask shadow pattern
IMX = -3.081075677882813E-01, IMY = -1.518419168542080E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-119.688000 -89.648000
-88.688000 -10.400000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9852 -15.6422 0.2 7.4 15.7 7.6661 52.7 0.4 Sco X-1
256.0750 -37.8212 1.7 18.0 158.0 0.9856 6.9 4.4 4U 1700-377
256.2539 -36.4365 3.9 17.0 154.7 0.4234 3.0 8.8 GX 349+2
262.8838 -24.7496 7.2 17.2 109.5 0.2547 1.6 6.8 GX 1+4
264.7671 -44.3765 7.3 27.3 156.5 0.3076 1.6 4.5 4U 1735-44
268.5183 -1.4737 3.2 31.9 60.9 0.9792 3.7 9.1 SW J1753.5-0127
270.3688 -25.1976 6.2 24.0 110.4 0.3734 1.9 8.5 GX 5-1
270.2526 -25.6847 4.3 23.9 111.6 0.5958 3.0 4.4 GRS 1758-258
274.0826 -14.1486 3.2 29.6 87.7 0.9974 3.6 8.1 GX 17+2
276.1212 -30.4031 6.7 29.4 121.3 0.4106 1.7 10.4 H1820-303
285.2286 -24.9579 0.0 37.4 111.3 0.3571 0.8 10.7 HT1900.1-2455
230.6081 19.9211 2.5 44.9 -8.5 1.2937 4.6 ------ UNKNOWN
198.4997 -40.4950 2.3 42.1 -115.9 2.6430 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-10.400000 6.324000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8208 -15.6312 8.7 7.4 14.5 0.0657 1.3 9.2 Sco X-1
255.8049 -37.7316 4.3 17.8 158.4 0.1397 2.7 10.9 4U 1700-377
256.2161 -36.3209 0.0 16.9 154.5 -0.0320 -0.6 12.2 GX 349+2
262.8980 -24.9304 0.0 17.2 110.1 -0.0636 -1.0 12.6 GX 1+4
264.5187 -44.4021 16.9 27.2 156.8 0.0424 0.7 10.0 4U 1735-44
268.5464 -1.5264 3.4 31.9 61.0 -0.3242 -3.4 11.6 SW J1753.5-0127
270.1460 -25.1722 9.0 23.8 110.3 -0.0917 -1.3 9.4 GX 5-1
270.2597 -25.7647 5.4 23.9 111.8 -0.1631 -2.3 2.7 GRS 1758-258
274.1639 -14.0198 19.2 29.7 87.5 -0.0572 -0.6 9.3 GX 17+2
276.0792 -30.3088 5.0 29.3 121.1 -0.1946 -2.3 8.7 H1820-303
285.1476 -25.0034 50.2 37.3 111.4 -0.0336 -0.2 7.9 HT1900.1-2455
258.7837 11.8247 2.3 37.6 33.6 0.4836 5.0 ------ UNKNOWN
258.1334 -37.6632 1.1 19.0 153.8 0.5624 10.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
79.412600 195.352500
300.312000 732.712600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9738 -15.6439 0.2 24.9 -0.4 38.1971 73.0 0.4 Sco X-1
256.0106 -37.8804 1.9 1.7 -68.3 3.4930 6.1 2.5 4U 1700-377
256.4116 -36.2963 5.9 1.9 -15.0 1.0587 1.9 7.7 GX 349+2
263.0881 -24.8748 4.4 13.4 50.8 1.2802 2.6 8.9 GX 1+4
264.8077 -44.2588 9.3 8.3 175.8 -0.6240 -1.2 11.8 4U 1735-44
268.2600 -1.3585 13.9 37.5 47.8 0.8949 0.8 8.6 SW J1753.5-0127
270.2936 -25.2117 3.7 16.2 74.3 1.7565 3.1 8.0 GX 5-1
270.3024 -25.8669 2.5 15.7 75.8 2.5318 4.6 7.4 GRS 1758-258
273.9509 -14.1994 4.9 27.3 66.2 1.7354 2.4 10.3 GX 17+2
275.9391 -30.3332 3.1 16.5 100.0 1.9433 3.7 2.2 H1820-303
285.0195 -24.7408 4.3 26.2 99.4 2.0304 2.7 10.8 HT1900.1-2455
Plot creation:
Fri Jul 2 11:36:00 EDT 2010