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
24.5974 41.4913 0.0241 41.1765 -147.9737 1.4603147 8.020 TRIG_00557771
Foreground time interval of the image:
-75.299 21.728 (delta_t = 97.027 [sec])
Background time interval of the image:
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
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)
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 -135.196 sec. to 21.728 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.62427 ( -0.359798 0.424854 )
Norm@50keV : 5.46619E-04 ( -0.0001682 0.000169508 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.70 using 59 PHA bins.
# Reduced chi-squared = 0.9596 for 57 degrees of freedom
# Null hypothesis probability = 5.619548e-01
Photon flux (15-150 keV) in 156.9 sec: 0.116105 ( -0.0183423 0.0183621 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.89556e-07 ( -1.83549e-07 1.96268e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -135.196 sec. to 21.728 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97253 ( )
Epeak [keV] : 1.55958 ( )
Norm@50keV : 1.42126E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.96 using 59 PHA bins.
# Reduced chi-squared = 0.9814 for 56 degrees of freedom
# Null hypothesis probability = 5.144023e-01
Photon flux (15-150 keV) in 156.9 sec: 0.115436 ( -0.0183261 0.018609 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.68799e-07 ( -1.9775e-07 2.11868e-07 ) ergs/cm2
Band function
Time interval is from -135.196 sec. to 21.728 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.20076 ( 3.20076 3.20076 )
beta : -2.62427 ( -0.424756 0.359654 )
Epeak [keV] : 3.19920 ( -3.1992 -3.1992 )
Norm@50keV : 7.42931E-02 ( -0.0228607 0.0230387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.70 using 59 PHA bins.
# Reduced chi-squared = 0.9945 for 55 degrees of freedom
# Null hypothesis probability = 4.861414e-01
Photon flux (15-150 keV) in 156.9 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] : 5.63795 (-1.07826 1.47028)
R^2/D10^2 : 0.531294 (-0.333737 0.860564)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.28 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.368365e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.202e-07 8.904e-08
25- 50 2.780e-07 1.054e-07
50-150 1.958e-08 1.343e-08
15-150 6.177e-07 2.147e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.5756 (-9.8656 16.4019)
Norm : 0.996936 (-0.323677 0.598619)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.19 using 59 PHA bins.
# Reduced chi-squared = 0.9857 for 57 degrees of freedom
# Null hypothesis probability = 5.055687e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.041e-07 6.715e-08
25- 50 3.312e-07 9.037e-08
50-150 1.619e-07 9.025e-08
15-150 7.972e-07 2.024e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.98321 (-0.977074 1.13019)
R1^2/D10^2 : 2.06786 (-1.39917 2.99565)
kT2 [keV] : 15.2834 (-4.8452 8.13363)
R2^2/D10^2 : 5.68442E-03 (-0.00469907 0.0219431)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.83 using 59 PHA bins.
# Reduced chi-squared = 0.9423 for 55 degrees of freedom
# Null hypothesis probability = 5.965586e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.326e-07 1.807e-07
25- 50 2.789e-07 1.470e-07
50-150 2.828e-07 1.818e-07
15-150 8.943e-07 4.685e-07
Peak spectrum fit
Power-law model
Time interval is from 19.056 sec. to 20.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.31900 ( -0.794689 1.10838 )
Norm@50keV : 3.39942E-03 ( -0.00221256 0.00217299 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.76 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 57 degrees of freedom
# Null hypothesis probability = 1.194955e-01
Photon flux (15-150 keV) in 1 sec: 0.600422 ( -0.255339 0.255506 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.26027e-08 ( -1.65202e-08 1.86444e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 19.056 sec. to 20.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92577 ( )
Epeak [keV] : 6.96407 ( )
Norm@50keV : 6.02423E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.70 using 59 PHA bins.
# Reduced chi-squared = 1.245 for 56 degrees of freedom
# Null hypothesis probability = 1.032184e-01
Photon flux (15-150 keV) in 1 sec: 0.596198 ( -0.254827 0.256544 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.13445e-08 ( -1.96338e-08 1.96101e-08 ) ergs/cm2
Band function
Time interval is from 19.056 sec. to 20.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93886 ( -6.92883 -4.93886 )
beta : -2.80335 ( 2.80335 1.12971 )
Epeak [keV] : 22.3551 ( -22.3551 9.62031 )
Norm@50keV : 1534.69 ( -635.916 1.75537e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.02 using 59 PHA bins.
# Reduced chi-squared = 1.255 for 55 degrees of freedom
# Null hypothesis probability = 9.686172e-02
Photon flux (15-150 keV) in 1 sec: 0.599269 0.594559 ( ) 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] : 6.33064 (-2.35356 4.61436)
R^2/D10^2 : 1.73311 (-1.73297 11.5138)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.40 using 59 PHA bins.
# Reduced chi-squared = 1.235 for 57 degrees of freedom
# Null hypothesis probability = 1.094378e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.929e-09 6.300e-09
25- 50 1.110e-08 7.660e-09
50-150 1.261e-09 1.181e-09
15-150 2.229e-08 1.409e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 37.8253 (-37.8452 -37.8452)
Norm : 4.05489 (-2.37944 9.11459)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.80 using 59 PHA bins.
# Reduced chi-squared = 1.225 for 57 degrees of freedom
# Null hypothesis probability = 1.188064e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.130e-09 5.855e-09
25- 50 1.172e-08 7.670e-09
50-150 8.518e-09 7.350e-09
15-150 2.937e-08 1.981e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.26521 (-5.21285 3.65759)
R1^2/D10^2 : 3.26224 (-2.07426 -3.33023)
kT2 [keV] : 24.2187 (-23.3002 -23.3002)
R2^2/D10^2 : 5.35342E-03 (-0.0058433 5.79732)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.74 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 55 degrees of freedom
# Null hypothesis probability = 1.008694e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.027e-08 6.395e-09
25- 50 1.029e-08 5.830e-09
50-150 1.389e-08 1.026e-08
15-150 3.444e-08 1.859e-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: 3.05279 ( -0.479483 0.60053 )
Norm@50keV : 4.80416E-04 ( -0.000209089 0.000232423 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.59 using 59 PHA bins.
# Reduced chi-squared = 0.9576 for 57 degrees of freedom
# Null hypothesis probability = 5.661790e-01
Photon flux (15-150 keV) in 97.03 sec: 0.137323 ( -0.0263465 0.0264226 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.7413e-07 ( -1.40786e-07 1.54951e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93993 ( )
Epeak [keV] : 1.56366 ( )
Norm@50keV : 2.95034E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.22 using 59 PHA bins.
# Reduced chi-squared = 0.9683 for 56 degrees of freedom
# Null hypothesis probability = 5.423380e-01
Photon flux (15-150 keV) in 97.03 sec: 0.135849 ( -0.026123 0.025663 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.40594e-07 ( -1.40078e-07 1.74777e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.96023 ( -4.68664 1.96241 )
beta : -9.37167 ( 9.37167 19.3716 )
Epeak [keV] : 1.06550 ( -0.902336 21.6603 )
Norm@50keV : 2.82779E-03 ( -0.00121505 0.0022592 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.22 using 59 PHA bins.
# Reduced chi-squared = 0.9858 for 55 degrees of freedom
# Null hypothesis probability = 5.045175e-01
Photon flux (15-150 keV) in 97.03 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) = 2.98e-07
S(50-100 keV) = 1.93e-07
T90 vs. Hardness ratio plot
T90 = 151.851999938488 sec.
Hardness ratio (energy fluence ratio) = 0.647651
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.561746
Count Ratio (50-100 keV) / (15-25 keV) = 0.392896
Mask shadow pattern
IMX = -7.415839185258359E-01, IMY = 4.638660711682224E-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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-75.299410 21.728000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
0.1490 -12.2984 2.3 33.6 105.7 1.2799 5.0 ------ UNKNOWN
24.5974 41.4913 1.4 41.2 -148.0 1.4605 8.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
147.300600 963.134100
1225.000000 1425.172400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
348.8138 6.8736 2.6 46.9 46.7 10.5199 4.4 ------ UNKNOWN
13.5966 31.0044 2.8 13.7 37.6 2.5578 4.1 ------ UNKNOWN
54.2219 58.2103 2.8 25.1 -147.8 2.3880 4.1 ------ UNKNOWN
60.3834 40.6244 2.9 26.9 -106.1 2.9614 4.0 ------ UNKNOWN
36.7594 -12.8338 3.5 55.5 -20.4 7.3078 3.3 ------ UNKNOWN
131.6018 66.3973 4.3 58.7 -159.3 14.0384 2.7 ------ UNKNOWN
42.2260 -14.9408 3.0 58.7 -26.0 14.6813 3.9 ------ UNKNOWN
53.4370 -1.8794 7.2 50.7 -44.5 5.8768 1.6 ------ UNKNOWN
101.1388 52.0976 3.8 51.0 -135.6 10.8557 3.1 ------ UNKNOWN
74.8109 31.0607 5.1 41.3 -97.9 9.1616 2.3 ------ UNKNOWN
Plot creation:
Sat May 30 16:30:14 EDT 2015