Click here for the BAT GCN circular template
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
24.3082 -64.1305 0.0118 9.4972 -126.9359 1.1279834 16.260 TRIG_00556930
Foreground time interval of the image:
36.128 72.501 (delta_t = 36.373 [sec])
Background time interval of the image:
-465.699 -449.564 (delta_t = 16.135 [sec])
-239.000 36.128 (delta_t = 275.128 [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 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)
Quad-rate summed light curves (from T0-300s to T0+1000s)
The mask-weighted light curves based on cleaned DPHs
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 36.128 sec. to 146.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60872 ( -0.144099 0.146453 )
Norm@50keV : 1.22007E-03 ( -0.000109576 0.00010837 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.06 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 57 degrees of freedom
# Null hypothesis probability = 4.360963e-01
Photon flux (15-150 keV) in 110.3 sec: 0.157212 ( -0.0128307 0.0128342 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25722e-06 ( -1.21754e-07 1.23564e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 36.128 sec. to 146.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20465 ( -0.615032 0.483609 )
Epeak [keV] : 88.9311 ( -30.8336 -88.9311 )
Norm@50keV : 2.03219E-03 ( -0.000879437 0.00231839 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.45 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 56 degrees of freedom
# Null hypothesis probability = 4.580259e-01
Photon flux (15-150 keV) in 110.3 sec: 0.154444 ( -0.013349 0.006698 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20272e-06 ( -1.40655e-07 1.42993e-07 ) ergs/cm2
Band function
Time interval is from 36.128 sec. to 146.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98781 ( -5.22718 -4.98781 )
beta : -1.77384 ( -0.219428 0.179907 )
Epeak [keV] : 25.1965 ( -4.4643 3.29836 )
Norm@50keV : 137.789 ( -11.1094 337.989 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.14 using 59 PHA bins.
# Reduced chi-squared = 0.9480 for 55 degrees of freedom
# Null hypothesis probability = 5.845266e-01
Photon flux (15-150 keV) in 110.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21974e-06 ( -1.21897e-06 -1.2447e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.7409 (-1.37283 1.55398)
R^2/D10^2 : 3.07839E-02 (-0.01037 0.0156252)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.73 using 59 PHA bins.
# Reduced chi-squared = 1.574 for 57 degrees of freedom
# Null hypothesis probability = 3.676324e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.169e-07 1.738e-08
25- 50 3.939e-07 3.960e-08
50-150 3.994e-07 7.550e-08
15-150 9.102e-07 9.817e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 161.608 (-56.5768 -160.554)
Norm : 0.646718 (-0.0557134 0.0689689)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.45 using 59 PHA bins.
# Reduced chi-squared = 0.9903 for 57 degrees of freedom
# Null hypothesis probability = 4.957812e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.820e-07 3.243e-08
25- 50 3.409e-07 1.046e-07
50-150 6.932e-07 3.821e-07
15-150 1.216e-06 4.848e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.12977 (-1.20424 1.49046)
R1^2/D10^2 : 0.277521 (-0.144444 0.334251)
kT2 [keV] : 22.5623 (-4.45488 7.99391)
R2^2/D10^2 : 3.12817E-03 (-0.00206727 0.0040104)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.94 using 59 PHA bins.
# Reduced chi-squared = 0.9625 for 55 degrees of freedom
# Null hypothesis probability = 5.537330e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.896e-07 8.453e-08
25- 50 3.369e-07 1.067e-07
50-150 6.722e-07 3.145e-07
15-150 1.199e-06 4.285e-07
Peak spectrum fit
Power-law model
Time interval is from 59.132 sec. to 60.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59196 ( -0.463889 0.503924 )
Norm@50keV : 3.75045E-03 ( -0.00116906 0.00112704 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.61 using 59 PHA bins.
# Reduced chi-squared = 0.9932 for 57 degrees of freedom
# Null hypothesis probability = 4.896599e-01
Photon flux (15-150 keV) in 1 sec: 0.480759 ( -0.132487 0.132522 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.51089e-08 ( -1.13761e-08 1.19277e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 59.132 sec. to 60.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.187670 ( -5.09576 2.39503 )
Epeak [keV] : 55.6365 ( )
Norm@50keV : 3.42784E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.31 using 59 PHA bins.
# Reduced chi-squared = 0.9877 for 56 degrees of freedom
# Null hypothesis probability = 5.008473e-01
Photon flux (15-150 keV) in 1 sec: 0.450151 ( -0.142829 0.141034 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.03448e-08 ( -1.04098e-08 1.36877e-08 ) ergs/cm2
Band function
Time interval is from 59.132 sec. to 60.132 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.173578 ( -0.758028 -0.758028 )
beta : -3.29764 ( 3.36086 5.27413 )
Epeak [keV] : 55.9705 ( -54.4763 44.8811 )
Norm@50keV : 3.34185E-02 ( -0.0196729 102.605 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.23 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.659559e-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] : 13.2234 (-3.16062 4.39054)
R^2/D10^2 : 8.92554E-02 (-0.0577685 0.145491)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.55 using 59 PHA bins.
# Reduced chi-squared = 0.9745 for 57 degrees of freedom
# Null hypothesis probability = 5.297799e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.309e-09 2.011e-09
25- 50 1.161e-08 5.713e-09
50-150 1.296e-08 9.225e-09
15-150 2.787e-08 1.481e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 172.134 (-116.115 -169.175)
Norm : 1.98387 (-0.55127 0.832439)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.12 using 59 PHA bins.
# Reduced chi-squared = 0.9846 for 57 degrees of freedom
# Null hypothesis probability = 5.079352e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.028e-09 2.995e-09
25- 50 9.498e-09 5.660e-09
50-150 1.979e-08 1.195e-08
15-150 3.431e-08 2.107e-08
Double BB
R1^2/D10^2 : 2.97376E+04 ( )
kT2 [keV] : 13.9824 (-3.55977 5.05868)
R2^2/D10^2 : 7.06117E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.96 using 59 PHA bins.
#Fit statistic : Chi-Squared = 53.78 using 59 PHA bins.
#Fit statistic : Chi-Squared = 53.74 using 59 PHA bins.
# Reduced chi-squared = 0.9810 for 55 degrees of freedom
# Reduced chi-squared = 0.9778 for 55 degrees of freedom
# Reduced chi-squared = 0.9771 for 55 degrees of freedom
# Null hypothesis probability = 5.145519e-01
# Null hypothesis probability = 5.212583e-01
# Null hypothesis probability = 5.228612e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.170e-09 1.837e-09
25- 50 1.063e-08 6.370e-09
50-150 1.419e-08 9.280e-09
15-150 2.899e-08 1.669e-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: 1.49593 ( -0.168062 0.170197 )
Norm@50keV : 1.81212E-03 ( -0.000187257 0.000185588 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.22 using 59 PHA bins.
# Reduced chi-squared = 0.7582 for 57 degrees of freedom
# Null hypothesis probability = 9.112703e-01
Photon flux (15-150 keV) in 36.37 sec: 0.225977 ( -0.0220257 0.0220345 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.2564e-07 ( -7.14303e-08 7.25454e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.848020 ( -0.852079 0.698653 )
Epeak [keV] : 82.1311 ( -24.7903 -82.1311 )
Norm@50keV : 4.04454E-03 ( -0.00228895 0.00744534 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.79 using 59 PHA bins.
# Reduced chi-squared = 0.7284 for 56 degrees of freedom
# Null hypothesis probability = 9.367795e-01
Photon flux (15-150 keV) in 36.37 sec: 0.219764 ( -0.023153 0.023036 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.84768e-07 ( -8.30109e-08 8.5084e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.70068 ( -12.4518 -4.70068 )
beta : -1.66241 ( -0.229068 0.210462 )
Epeak [keV] : 27.0812 ( -5.4131 4.97136 )
Norm@50keV : 74.3856 ( -7.16556 838.749 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.74 using 59 PHA bins.
# Reduced chi-squared = 0.7226 for 55 degrees of freedom
# Null hypothesis probability = 9.395451e-01
Photon flux (15-150 keV) in 36.37 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.91634e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.27e-07
S(50-100 keV) = 4.29e-07
T90 vs. Hardness ratio plot
T90 = 87.5919999480247 sec.
Hardness ratio (energy fluence ratio) = 1.31193
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.21489
Count Ratio (50-100 keV) / (15-25 keV) = 0.853815
Mask shadow pattern
IMX = -1.005298123265684E-01, IMY = 1.337184207226820E-01
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:
-465.699400 -449.564300
-239.000000 36.128000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5134 -40.6786 11.8 57.4 -8.9 1.3195 1.0 7.5 Vela X-1
169.9734 -60.5052 36.3 44.2 24.8 0.1617 0.3 12.3 Cen X-3
186.7563 -62.7379 216.9 43.3 36.6 0.0311 0.1 3.4 GX 301-2
296.2606 -49.5125 2.2 42.0 122.2 4.9608 5.2 ------ UNKNOWN
152.4087 -54.4010 3.1 47.7 9.9 1.8592 3.7 ------ UNKNOWN
151.9749 -48.5695 2.3 53.2 7.5 4.5405 5.1 ------ UNKNOWN
358.9529 -16.2769 4.8 58.8 -159.3 4.0432 2.4 ------ UNKNOWN
97.7328 -37.0831 5.5 50.7 -44.6 2.8720 2.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
36.128000 72.500600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3516 -40.6039 5.0 57.4 -9.1 0.8460 2.3 8.6 Vela X-1
170.2517 -60.7239 18.0 44.0 25.0 0.1056 0.6 6.3 Cen X-3
186.8659 -62.6897 14.5 43.4 36.7 0.1625 0.8 7.5 GX 301-2
134.8614 -52.0192 2.6 46.5 -4.7 0.5689 4.5 ------ UNKNOWN
24.3082 -64.1305 0.7 9.5 -126.9 1.1281 16.3 ------ UNKNOWN
104.2562 -38.9233 1.9 50.8 -37.5 1.4366 5.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
101.500600 963.057000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
38.8885 -77.0609 3.5 13.7 37.7 1.8414 3.3 ------ UNKNOWN
2.8810 -45.5846 3.5 22.0 -171.3 1.7992 3.3 ------ UNKNOWN
113.0122 -38.4226 3.6 55.5 -20.4 6.9540 3.2 ------ UNKNOWN
89.7573 -32.4201 5.2 50.6 -44.5 8.7301 2.3 ------ UNKNOWN
89.9619 -32.2667 4.9 50.8 -44.5 10.9870 2.8 ------ UNKNOWN
Plot creation:
Sat May 30 16:44:27 EDT 2015