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
336.6572 -31.4147 0.0200 31.5292 -155.2796 0.7557589 9.629 TRIG_00509018
Foreground time interval of the image:
33.000 72.501 (delta_t = 39.501 [sec])
Background time interval of the image:
-722.499 -701.003 (delta_t = 21.496 [sec])
-239.000 33.000 (delta_t = 272.000 [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 33.000 sec. to 81.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82751 ( -0.285393 0.305839 )
Norm@50keV : 1.06355E-03 ( -0.000204942 0.000197227 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.96 using 59 PHA bins.
# Reduced chi-squared = 0.9467 for 57 degrees of freedom
# Null hypothesis probability = 5.898182e-01
Photon flux (15-150 keV) in 48 sec: 0.148147 ( -0.0229207 0.0229238 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.69595e-07 ( -8.89138e-08 9.1633e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 33.000 sec. to 81.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01155 ( )
Epeak [keV] : 5.14539 ( )
Norm@50keV : 8.37631E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.94 using 59 PHA bins.
# Reduced chi-squared = 0.9633 for 56 degrees of freedom
# Null hypothesis probability = 5.530832e-01
Photon flux (15-150 keV) in 48 sec: 0.148106 ( -0.022917 0.022909 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.69264e-07 ( -1.00145e-07 9.13714e-08 ) ergs/cm2
Band function
Time interval is from 33.000 sec. to 81.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.665315 ( 0.916873 0.916873 )
beta : -1.88670 ( 1.88485 0.335408 )
Epeak [keV] : 24.2942 ( -30.6971 -30.6971 )
Norm@50keV : 9.63895E-02 ( -0.0960519 196.567 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.79 using 59 PHA bins.
# Reduced chi-squared = 0.9781 for 55 degrees of freedom
# Null hypothesis probability = 5.207641e-01
Photon flux (15-150 keV) in 48 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] : 9.94195 (-1.91236 2.54901)
R^2/D10^2 : 6.94162E-02 (-0.0397385 0.0862235)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.88 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 57 degrees of freedom
# Null hypothesis probability = 1.739432e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.694e-08 2.056e-08
25- 50 1.651e-07 3.869e-08
50-150 8.471e-08 3.680e-08
15-150 3.167e-07 8.450e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 95.5577 (-42.4449 -95.5578)
Norm : 0.659741 (-0.13202 0.186706)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.71 using 59 PHA bins.
# Reduced chi-squared = 0.9598 for 57 degrees of freedom
# Null hypothesis probability = 5.615368e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.274e-08 1.704e-08
25- 50 1.417e-07 3.223e-08
50-150 2.238e-07 1.452e-07
15-150 4.482e-07 1.579e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.34314 (-1.91039 2.1439)
R1^2/D10^2 : 0.296577 (-0.194287 0.863564)
kT2 [keV] : 28.8263 (-11.5369 38.414)
R2^2/D10^2 : 1.09087E-03 (-0.000989722 0.00573582)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.92 using 59 PHA bins.
# Reduced chi-squared = 0.9622 for 55 degrees of freedom
# Null hypothesis probability = 5.545680e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.906e-08 4.934e-08
25- 50 1.345e-07 6.624e-08
50-150 2.625e-07 1.544e-07
15-150 4.860e-07 2.550e-07
Peak spectrum fit
Power-law model
Time interval is from 56.500 sec. to 57.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14121 ( -1.08992 1.58497 )
Norm@50keV : 1.66450E-03 ( -0.00133483 0.0013615 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.19 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 57 degrees of freedom
# Null hypothesis probability = 2.967596e-01
Photon flux (15-150 keV) in 1 sec: 0.267325 ( -0.156376 0.157107 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55338e-08 ( -1.04112e-08 1.26641e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 56.500 sec. to 57.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.80446 ( )
Epeak [keV] : 29.6542 ( )
Norm@50keV : 0.848896 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.43 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 56 degrees of freedom
# Null hypothesis probability = 2.876899e-01
Photon flux (15-150 keV) in 1 sec: 0.247445 ( -0.142701 0.151171 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08376e-08 ( -6.54762e-09 1.5019e-08 ) ergs/cm2
Band function
Time interval is from 56.500 sec. to 57.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93928 ( -4.93928 -4.93928 )
beta : -3.43176 ( 3.43176 2.04232 )
Epeak [keV] : 27.4040 ( -27.404 14.5365 )
Norm@50keV : 189.735 ( -103.915 7.30006e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.10 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 55 degrees of freedom
# Null hypothesis probability = 2.661920e-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] : 7.56495 (-3.2689 6.15884)
R^2/D10^2 : 0.399431 (-0.399431 3.43219)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.46 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.195342e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.953e-09 2.680e-09
25- 50 6.263e-09 4.399e-09
50-150 1.363e-09 1.492e-09
15-150 1.158e-08 8.005e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.9659 (-40.9655 -40.9655)
Norm : 1.73276 (-1.73277 -1.73277)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.93 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.047796e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.010e-09 2.764e-09
25- 50 5.331e-09 3.799e-09
50-150 4.232e-09 4.204e-09
15-150 1.357e-08 1.043e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 198.044 ( )
R1^2/D10^2 : 2.01152E-05 (-2.01325e-05 0.00405331)
kT2 [keV] : 7.16880 (-7.16876 5.82525)
R2^2/D10^2 : 0.475144 (-0.432941 22.4379)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.46 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.10 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 55 degrees of freedom
# Reduced chi-squared = 1.111 for 55 degrees of freedom
# Null hypothesis probability = 2.559265e-01
# Null hypothesis probability = 2.662469e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.939e-09 1.585e-05
25- 50 6.182e-09 1.485e-04
50-150 1.433e-09 3.936e-03
15-150 1.155e-08 3.893e-03
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: 1.82441 ( -0.293318 0.316057 )
Norm@50keV : 1.12703E-03 ( -0.000225687 0.000217192 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.04 using 59 PHA bins.
# Reduced chi-squared = 0.8428 for 57 degrees of freedom
# Null hypothesis probability = 7.950903e-01
Photon flux (15-150 keV) in 39.5 sec: 0.156796 ( -0.0252964 0.0252997 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.09532e-07 ( -8.05994e-08 8.31222e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64898 ( -1.26752 0.720784 )
Epeak [keV] : 88.1241 ( -88.1044 -88.1219 )
Norm@50keV : 1.41451E-03 ( -0.00141455 0.00593323 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.96 using 59 PHA bins.
# Reduced chi-squared = 0.8564 for 56 degrees of freedom
# Null hypothesis probability = 7.691441e-01
Photon flux (15-150 keV) in 39.5 sec: 0.155793 ( -0.025928 0.025819 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.02552e-07 ( -9.00011e-08 8.86103e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62960 ( -1.44449 1.35435 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 83.9643 ( -108.694 -119.526 )
Norm@50keV : 1.44953E-03 ( -0.00052654 0.00589298 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.96 using 59 PHA bins.
# Reduced chi-squared = 0.8719 for 55 degrees of freedom
# Null hypothesis probability = 7.383319e-01
Photon flux (15-150 keV) in 39.5 sec: 0.155179 ( ) 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) = 1.34e-07
S(50-100 keV) = 1.51e-07
T90 vs. Hardness ratio plot
T90 = 48 sec.
Hardness ratio (energy fluence ratio) = 1.12687
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.13703
Count Ratio (50-100 keV) / (15-25 keV) = 0.682512
Mask shadow pattern
IMX = -5.572793627266761E-01, IMY = 2.565603686262565E-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:
-722.499400 -701.003300
-239.000000 33.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5771 35.1769 4.3 52.4 -25.6 1.7641 2.7 1.6 Cyg X-1
308.1454 40.9551 5.8 50.8 -14.4 1.0562 2.0 1.6 Cyg X-3
326.1021 38.3065 7.4 40.9 -0.5 0.5707 1.6 3.4 Cyg X-2
358.5508 42.0965 3.2 45.1 35.9 2.5837 3.6 ------ UNKNOWN
355.9366 11.2300 2.6 18.7 69.4 1.1020 4.4 ------ UNKNOWN
10.1555 -34.2094 2.5 43.6 161.9 2.3323 4.7 ------ UNKNOWN
354.6332 -18.7957 3.0 22.9 162.7 0.9389 3.9 ------ UNKNOWN
6.9025 -49.4761 2.9 54.1 177.0 3.4582 4.0 ------ UNKNOWN
347.2227 -59.0441 2.6 59.1 -166.2 6.8478 4.5 ------ UNKNOWN
318.0187 -29.1635 3.0 36.4 -127.3 1.5235 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
33.000000 72.500600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5017 35.1307 5.0 52.4 -25.7 -0.4622 -2.3 6.1 Cyg X-1
307.9447 41.0443 6.1 51.0 -14.5 -0.2932 -1.9 9.3 Cyg X-3
326.2726 38.4268 6.4 40.9 -0.2 0.1830 1.8 7.9 Cyg X-2
1.9208 15.5601 2.9 25.9 69.2 0.3787 4.0 ------ UNKNOWN
336.6572 -31.4147 1.2 31.5 -155.3 0.7562 9.6 ------ UNKNOWN
316.8637 -45.7633 2.3 50.3 -140.7 1.2468 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
123.700600 337.300600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
333.8521 2.2274 2.9 33.7 12.6 0.9268 3.9 ------ UNKNOWN
336.1291 -57.6643 2.7 26.3 -161.7 0.7872 4.3 ------ UNKNOWN
46.4145 -87.2515 2.8 57.7 -165.4 3.9588 4.1 ------ UNKNOWN
282.8854 -51.7269 3.4 43.8 -116.2 2.7628 3.4 ------ UNKNOWN
Plot creation:
Sat May 30 20:59:13 EDT 2015