Click here for the BAT GCN circular template
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
264.1212 -27.3172 0.0440 3.5 -47.7 0.3879 4.3 TRIG_00501485
------------------------------------------
Foreground time interval of the image:
0.000 49.210 (delta_t = 49.210 [sec])
50.000 64.000 (delta_t = 14.000 [sec])
Background time interval of the image:
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 64.000000
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 64.000000
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 64.000000
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
Multiple GTIs in the spectrum
tstart tstop
0.000000 49.210000
50.000000 64.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27690 ( -0.518346 0.603506 )
Norm@50keV : 3.00048E-04 ( -0.000127572 0.000130351 )
------------------------------------------------------------
# Chi-Squared = 52.80 using 59 PHA bins.
# Reduced chi-squared = 0.9262 for 57 degrees of freedom
# Null hypothesis probability = 6.334541e-01
Photon flux (15-150 keV) in 63.21 sec: 5.17673E-02 ( -0.0150574 0.0150871 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80398e-07 ( -6.30402e-08 7.0031e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 49.210000
50.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.76139 ( 3.44898 3.94805 )
Epeak [keV] : 28.3296 ( -5.56201 5.95468 )
Norm@50keV : 23.3970 ( )
------------------------------------------------------------
# Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8354 for 56 degrees of freedom
# Null hypothesis probability = 8.050863e-01
Photon flux (15-150 keV) in 63.21 sec: 4.87043E-02 ( -0.0138295 0.0140019 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32889e-07 ( -3.93141e-08 4.38551e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 49.210000
50.000000 64.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94271 ( -45.2772 -35.3242 )
beta : -9.37023 ( 9.99772 19.9906 )
Epeak [keV] : 28.3679 ( -4.56119 5.28946 )
Norm@50keV : 31.2373 ( -14.374 27.0311 )
------------------------------------------------------------
# Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8505 for 55 degrees of freedom
# Null hypothesis probability = 7.771203e-01
Photon flux (15-150 keV) in 63.21 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] : 7.18279 (-1.49201 1.92184)
R^2/D10^2 : 9.66996E-02 (-0.0611319 0.156423)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 47.57 using 59 PHA bins.
# Reduced chi-squared = 0.8345 for 57 degrees of freedom
# Null hypothesis probability = 8.089852e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.199e-08 2.644e-08
25- 50 7.482e-08 4.510e-08
50-150 1.360e-08 1.054e-08
15-150 1.404e-07 8.552e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 33.1446 (-14.8155 41.7653)
Norm : 0.392414 (-0.168284 0.30516)
------------------------------------------------------------
# Chi-Squared = 50.82 using 59 PHA bins.
# Reduced chi-squared = 0.8915 for 57 degrees of freedom
# Null hypothesis probability = 7.048946e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.294e-08 2.551e-08
25- 50 6.377e-08 3.554e-08
50-150 3.965e-08 3.241e-08
15-150 1.564e-07 9.262e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.954 ( )
R1^2/D10^2 : 1.91185E-06 (-1.91082e-06 6.00218e-06)
kT2 [keV] : 7.02629 (-7.02636 1.94074)
R2^2/D10^2 : 0.103926 (-0.0663065 0.172963)
------------------------------------------------------------
# Chi-Squared = 47.57 using 59 PHA bins.
# Chi-Squared = 47.25 using 59 PHA bins.
# Reduced chi-squared = 0.8649 for 55 degrees of freedom
# Reduced chi-squared = 0.8591 for 55 degrees of freedom
# Null hypothesis probability = 7.513747e-01
# Null hypothesis probability = 7.619013e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.216e-08 2.470e-02
25- 50 7.466e-08 1.977e-01
50-150 1.346e-08 5.009e+00
15-150 1.403e-07 5.373e+00
Peak spectrum fit
Power-law model
Time interval is from 50.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27690 ( -0.518346 0.603506 )
Norm@50keV : 3.00048E-04 ( -0.000127572 0.000130351 )
------------------------------------------------------------
# Chi-Squared = 52.80 using 59 PHA bins.
# Reduced chi-squared = 0.9262 for 57 degrees of freedom
# Null hypothesis probability = 6.334541e-01
Photon flux (15-150 keV) in 63.21 sec: 5.17673E-02 ( -0.0150574 0.0150871 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80398e-07 ( -6.30402e-08 7.0031e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 50.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.76139 ( 3.44898 3.94805 )
Epeak [keV] : 28.3296 ( -5.56201 5.95468 )
Norm@50keV : 23.3970 ( )
------------------------------------------------------------
# Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8354 for 56 degrees of freedom
# Null hypothesis probability = 8.050863e-01
Photon flux (15-150 keV) in 63.21 sec: 4.87043E-02 ( -0.0138295 0.0140019 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32889e-07 ( -3.93141e-08 4.38551e-08 ) ergs/cm2
Band function
Time interval is from 50.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94271 ( -45.3224 -35.3242 )
beta : -9.37023 ( 9.99772 19.9906 )
Epeak [keV] : 28.3679 ( -4.56119 5.28946 )
Norm@50keV : 31.2373 ( -14.374 27.0311 )
------------------------------------------------------------
# Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8505 for 55 degrees of freedom
# Null hypothesis probability = 7.771203e-01
Photon flux (15-150 keV) in 63.21 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] : 7.18279 (-1.49201 1.92184)
R^2/D10^2 : 9.66996E-02 (-0.0611319 0.156423)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 47.57 using 59 PHA bins.
# Reduced chi-squared = 0.8345 for 57 degrees of freedom
# Null hypothesis probability = 8.089852e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.199e-08 3.095e-08
25- 50 7.482e-08 4.627e-08
50-150 1.360e-08 1.127e-08
15-150 1.404e-07 8.755e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 33.1446 (-14.8155 41.7653)
Norm : 0.392414 (-0.168284 0.30516)
------------------------------------------------------------
# Chi-Squared = 50.82 using 59 PHA bins.
# Reduced chi-squared = 0.8915 for 57 degrees of freedom
# Null hypothesis probability = 7.048946e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.294e-08 2.563e-08
25- 50 6.377e-08 3.820e-08
50-150 3.965e-08 3.373e-08
15-150 1.564e-07 8.763e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.954 ( )
R1^2/D10^2 : 1.91185E-06 (-1.91082e-06 6.00218e-06)
kT2 [keV] : 7.02629 (-7.02636 1.94074)
R2^2/D10^2 : 0.103926 (-0.0663065 0.172963)
------------------------------------------------------------
# Chi-Squared = 47.57 using 59 PHA bins.
# Chi-Squared = 47.25 using 59 PHA bins.
# Reduced chi-squared = 0.8649 for 55 degrees of freedom
# Reduced chi-squared = 0.8591 for 55 degrees of freedom
# Null hypothesis probability = 7.513747e-01
# Null hypothesis probability = 7.619013e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.216e-08 2.379e-02
25- 50 7.466e-08 1.856e-01
50-150 1.346e-08 4.491e+00
15-150 1.403e-07 5.019e+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: 2.27690 ( -0.518346 0.603506 )
Norm@50keV : 3.00048E-04 ( -0.000127572 0.000130351 )
------------------------------------------------------------
# Chi-Squared = 52.80 using 59 PHA bins.
# Reduced chi-squared = 0.9262 for 57 degrees of freedom
# Null hypothesis probability = 6.334541e-01
Photon flux (15-150 keV) in 63.21 sec: 5.17673E-02 ( -0.0150574 0.0150871 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80398e-07 ( -6.30402e-08 7.0031e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.76139 ( 3.44898 3.94805 )
Epeak [keV] : 28.3296 ( -5.56201 5.95468 )
Norm@50keV : 23.3970 ( )
------------------------------------------------------------
# Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8354 for 56 degrees of freedom
# Null hypothesis probability = 8.050863e-01
Photon flux (15-150 keV) in 63.21 sec: 4.87043E-02 ( -0.0138295 0.0140019 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32889e-07 ( -3.93141e-08 4.38551e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94271 ( -45.3225 -35.3242 )
beta : -9.37023 ( 9.99772 19.9906 )
Epeak [keV] : 28.3679 ( -4.56119 5.28946 )
Norm@50keV : 31.2373 ( -14.374 27.0311 )
------------------------------------------------------------
# Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8505 for 55 degrees of freedom
# Null hypothesis probability = 7.771203e-01
Photon flux (15-150 keV) in 63.21 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) = 5.80257e-08
S(50-100 keV) = 4.78532e-08
T90 vs. Hardness ratio plot
T90 = 64 sec.
Hardness ratio (energy fluence ratio) = 0.82469
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.966352
Count Ratio (50-100 keV) / (15-25 keV) = 0.0878588
Mask shadow pattern
IMX = 4.162656584294525E-02, IMY = 4.574294596696297E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.000000 49.210000
50.000000 64.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9756 -15.6336 0.5 24.8 -52.3 2.4630 24.9 0.5 Sco X-1
256.0715 -37.8312 2.8 12.7 -125.9 0.3515 4.1 4.1 4U 1700-377
256.3297 -36.4600 4.4 11.8 -121.3 0.2263 2.6 5.6 GX 349+2
262.8329 -24.6149 8.7 6.2 -33.3 0.1148 1.3 12.4 GX 1+4
264.7070 -44.3082 3.9 15.2 -163.3 0.2417 2.9 8.6 4U 1735-44
268.4358 -1.3545 6.6 28.0 11.2 0.1807 1.7 7.2 SW J1753.5-0127
270.1346 -25.1697 4.3 4.8 39.8 0.2377 2.9 9.8 GX 5-1
270.1765 -25.6678 5.5 4.4 43.4 0.2248 2.7 8.2 GRS 1758-258
274.1872 -14.1544 0.0 16.4 32.9 0.1675 2.0 12.7 GX 17+2
275.7806 -30.4925 7.1 7.3 110.6 -0.1291 -1.6 10.6 H1820-303
285.1199 -24.9060 7.6 16.3 87.7 0.1521 1.5 4.6 HT1900.1-2455
288.7343 10.8921 3.0 45.1 39.3 1.1213 3.9 5.0 GRS 1915+105
269.7201 4.8130 2.6 34.2 13.2 0.4852 4.4 ------ UNKNOWN
250.1444 15.1024 2.5 47.4 -13.8 0.7339 4.7 ------ UNKNOWN
247.2337 -58.3321 2.2 32.2 -151.0 0.5154 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
97.900590 100.170000
101.000000 138.540000
140.000000 276.010000
277.000000 286.560000
288.000000 420.770000
421.000000 641.810000
643.000000 825.700000
827.000000 963.103600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9820 -15.6434 0.2 21.3 -61.0 30.4172 49.8 0.2 Sco X-1
255.9929 -37.8544 2.4 12.5 -149.3 2.4490 4.8 0.7 4U 1700-377
256.4900 -36.4716 2.1 11.2 -146.9 2.8595 5.6 3.9 GX 349+2
263.1717 -24.8733 7.7 2.6 -20.5 0.8837 1.5 11.7 GX 1+4
264.6125 -44.5998 14.0 17.2 178.5 0.3987 0.8 10.6 4U 1735-44
268.4543 -1.4869 2.7 26.2 9.3 2.4699 4.2 5.6 SW J1753.5-0127
270.1921 -25.0350 3.5 5.9 67.5 1.5627 3.4 5.7 GX 5-1
270.3817 -25.8447 4.4 5.8 75.6 1.2470 2.6 7.4 GRS 1758-258
273.9556 -14.0356 2.5 16.2 35.9 2.5445 4.6 2.9 GX 17+2
275.9032 -30.2625 3.5 10.7 108.0 1.7042 3.3 6.4 H1820-303
285.0716 -24.7721 4.2 18.9 86.4 1.6721 2.8 9.1 HT1900.1-2455
288.8280 10.9370 1.5 45.2 34.8 10.8366 7.5 1.8 GRS 1915+105
315.9607 -49.0816 3.7 45.0 132.8 7.7647 3.2 ------ UNKNOWN
277.3997 -23.7986 2.2 12.4 75.8 2.9521 5.3 ------ UNKNOWN
278.4159 -81.4522 4.5 54.4 176.9 6.1552 2.6 ------ UNKNOWN
243.1509 -52.4674 1.8 29.6 -154.2 3.5521 6.3 ------ UNKNOWN
255.4103 29.5264 2.8 57.5 -9.5 10.3701 4.1 ------ UNKNOWN
208.7714 -78.4200 2.6 56.5 -169.1 10.1468 4.5 ------ UNKNOWN
241.3289 -40.5445 2.0 23.0 -131.4 2.8142 5.8 ------ UNKNOWN
Plot creation:
Sat Aug 27 02:27:56 EDT 2011