Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
75.1324 -75.7002 0.0080 7.3201 -24.8807 1.0601535 24.032 TRIG_00572742
Foreground time interval of the image:
-5.616 12.685 (delta_t = 18.301 [sec])
Background time interval of the image:
-739.115 -720.993 (delta_t = 18.123 [sec])
-239.616 -5.616 (delta_t = 234.000 [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
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 -5.616 sec. to 57.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.22542 ( -0.148616 0.155868 )
Norm@50keV : 1.32282E-03 ( -0.000143124 0.000141529 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.68 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.136654e-01
Photon flux (15-150 keV) in 63 sec: 0.221967 ( -0.0168779 0.0168817 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.86473e-07 ( -7.21268e-08 7.36539e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.616 sec. to 57.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.894257 ( -0.912878 0.769336 )
Epeak [keV] : 30.9686 ( -10.2273 5.488 )
Norm@50keV : 8.67915E-03 ( -0.00867915 0.0234209 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.94 using 59 PHA bins.
# Reduced chi-squared = 0.8739 for 56 degrees of freedom
# Null hypothesis probability = 7.368643e-01
Photon flux (15-150 keV) in 63 sec: 0.211473 ( -0.017473 0.017582 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.89063e-07 ( -7.33736e-08 8.23347e-08 ) ergs/cm2
Band function
Time interval is from -5.616 sec. to 57.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.894083 ( -0.247366 3.72535 )
beta : -6.81803 ( 3.60495 13.6049 )
Epeak [keV] : 30.9622 ( -9.58844 5.23429 )
Norm@50keV : 8.68133E-03 ( -0.00473677 1.47667 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.94 using 59 PHA bins.
# Reduced chi-squared = 0.8898 for 55 degrees of freedom
# Null hypothesis probability = 7.041480e-01
Photon flux (15-150 keV) in 63 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.96251e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.58405 (-0.695509 0.755701)
R^2/D10^2 : 0.184075 (-0.0528969 0.0746417)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.72 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.253115e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.620e-07 2.133e-08
25- 50 3.193e-07 2.712e-08
50-150 1.052e-07 2.618e-08
15-150 5.865e-07 5.547e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 43.8544 (-7.88828 12.7922)
Norm : 1.35577 (-0.18581 0.220375)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.72 using 59 PHA bins.
# Reduced chi-squared = 0.8723 for 57 degrees of freedom
# Null hypothesis probability = 7.421307e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.019e-07 1.906e-08
25- 50 2.759e-07 2.133e-08
50-150 2.354e-07 5.629e-08
15-150 7.132e-07 7.396e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.94590 (-1.60815 1.70418)
R1^2/D10^2 : 0.950134 (-0.579256 3.44388)
kT2 [keV] : 12.7198 (-2.60788 5.71122)
R2^2/D10^2 : 2.66052E-02 (-0.0222357 0.0545747)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.59 using 59 PHA bins.
# Reduced chi-squared = 0.8835 for 55 degrees of freedom
# Null hypothesis probability = 7.163835e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.969e-07 1.037e-07
25- 50 2.820e-07 1.440e-07
50-150 1.987e-07 1.101e-07
15-150 6.776e-07 3.067e-07
Peak spectrum fit
Power-law model
Time interval is from 5.384 sec. to 6.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.23165 ( -0.379119 0.438876 )
Norm@50keV : 3.53985E-03 ( -0.00112742 0.00111068 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.82 using 59 PHA bins.
# Reduced chi-squared = 0.8390 for 57 degrees of freedom
# Null hypothesis probability = 8.015271e-01
Photon flux (15-150 keV) in 1 sec: 0.595959 ( -0.122407 0.122565 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.34382e-08 ( -8.79214e-09 9.42666e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.384 sec. to 6.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39749E-02 ( -6.74674 2.11588 )
Epeak [keV] : 27.8137 ( )
Norm@50keV : 0.117898 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.93 using 59 PHA bins.
# Reduced chi-squared = 0.8202 for 56 degrees of freedom
# Null hypothesis probability = 8.293144e-01
Photon flux (15-150 keV) in 1 sec: 0.563630 ( -0.117765 0.122459 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.52421e-08 ( -6.4684e-09 1.29647e-08 ) ergs/cm2
Band function
Time interval is from 5.384 sec. to 6.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -6.75227 -5 )
beta : -2.83188 ( -3.94877 0.657601 )
Epeak [keV] : 23.9300 ( -6.27209 4.96045 )
Norm@50keV : 1070.88 ( -212.021 6746.82 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.25 using 59 PHA bins.
# Reduced chi-squared = 0.8045 for 55 degrees of freedom
# Null hypothesis probability = 8.498895e-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] : 7.18088 (-1.29402 1.59219)
R^2/D10^2 : 1.06741 (-0.594861 1.31395)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.92 using 59 PHA bins.
# Reduced chi-squared = 0.8056 for 57 degrees of freedom
# Null hypothesis probability = 8.531870e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.073e-09 3.887e-09
25- 50 1.305e-08 5.157e-09
50-150 2.369e-09 1.614e-09
15-150 2.449e-08 8.410e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 37.7106 (-15.1124 33.6017)
Norm : 4.06593 (-1.31787 2.14859)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.59 using 59 PHA bins.
# Reduced chi-squared = 0.8173 for 57 degrees of freedom
# Null hypothesis probability = 8.360163e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.145e-09 2.665e-09
25- 50 1.172e-08 4.369e-09
50-150 8.491e-09 5.614e-09
15-150 2.936e-08 1.001e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.75900 (-3.17899 1.5564)
R1^2/D10^2 : 1.30604 (-0.735396 2.24188)
kT2 [keV] : 99.4936 (-99.9277 -99.9277)
R2^2/D10^2 : 1.17675E-04 (-0.000118028 0.00281483)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.32 using 59 PHA bins.
# Reduced chi-squared = 0.7876 for 55 degrees of freedom
# Null hypothesis probability = 8.727696e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.301e-09 4.528e-09
25- 50 1.237e-08 5.994e-09
50-150 1.296e-08 5.753e-09
15-150 3.463e-08 1.364e-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: 1.93994 ( -0.113262 0.116301 )
Norm@50keV : 3.24935E-03 ( -0.000257715 0.000255448 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.93 using 59 PHA bins.
# Reduced chi-squared = 1.507 for 57 degrees of freedom
# Null hypothesis probability = 7.930715e-03
Photon flux (15-150 keV) in 18.3 sec: 0.474427 ( -0.0310152 0.0310206 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.47051e-07 ( -4.19904e-08 4.25632e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.127768 ( -0.822714 0.70776 )
Epeak [keV] : 40.5782 ( -3.34196 4.08788 )
Norm@50keV : 5.43666E-02 ( -0.0336573 0.114445 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.89 using 59 PHA bins.
# Reduced chi-squared = 0.9444 for 56 degrees of freedom
# Null hypothesis probability = 5.934626e-01
Photon flux (15-150 keV) in 18.3 sec: 0.442926 ( -0.031744 0.0319 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.55463e-07 ( -3.9991e-08 4.34918e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.397996 ( -0.882493 1.42179 )
beta : -3.32833 ( 3.32833 0.743355 )
Epeak [keV] : 39.2389 ( -5.16124 4.66384 )
Norm@50keV : 8.17168E-02 ( -0.0525283 0.697423 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.11 using 59 PHA bins.
# Reduced chi-squared = 0.9474 for 55 degrees of freedom
# Null hypothesis probability = 5.858765e-01
Photon flux (15-150 keV) in 18.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.73168e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.50e-07
S(50-100 keV) = 2.14e-07
T90 vs. Hardness ratio plot
T90 = 52 sec.
Hardness ratio (energy fluence ratio) = 0.856
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.989809
Count Ratio (50-100 keV) / (15-25 keV) = 0.315493
Mask shadow pattern
IMX = 1.165369622330883E-01, IMY = 5.404684515048148E-02
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:
-739.115400 -720.992500
-239.616000 -5.616000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5329 -40.6743 4.7 41.3 -129.5 1.0005 2.4 7.2 Vela X-1
170.6144 -60.5382 12.3 37.1 -82.9 0.4750 1.0 10.2 Cen X-3
186.9012 -62.8323 5.8 39.7 -70.6 -1.2084 -2.0 7.7 GX 301-2
354.6172 -48.8126 2.8 42.9 44.9 2.4852 4.2 ------ UNKNOWN
7.5188 -52.6826 2.1 35.1 52.1 1.9122 5.4 ------ UNKNOWN
144.3656 -64.2278 1.9 26.0 -94.7 1.5101 6.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-5.616000 12.684590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5532 -40.6028 5.0 41.4 -129.6 0.2200 2.3 3.1 Vela X-1
170.4622 -60.7423 6.2 36.9 -82.8 0.2034 1.8 8.4 Cen X-3
186.8909 -62.8646 13.7 39.6 -70.6 -0.1124 -0.8 8.6 GX 301-2
319.7993 -49.0019 2.1 53.7 18.0 1.2726 5.4 ------ UNKNOWN
75.1324 -75.7002 0.5 7.3 -24.9 1.0603 24.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
41.484590 422.694000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4787 -40.5290 13.0 43.8 -130.7 0.3260 0.9 2.7 Vela X-1
170.6351 -60.5639 6.0 33.7 -85.5 -0.5398 -1.9 10.1 Cen X-3
186.6359 -62.8065 3.8 34.9 -71.6 0.9328 3.0 2.2 GX 301-2
69.7907 -24.3410 2.3 51.5 150.3 4.2230 5.0 ------ UNKNOWN
351.3993 -58.0669 2.0 33.2 50.2 1.4882 5.7 ------ UNKNOWN
95.4046 -19.6282 2.6 57.1 179.4 4.3567 4.4 ------ UNKNOWN
75.2974 -75.6897 2.3 0.1 -150.5 0.7141 5.0 ------ UNKNOWN
180.8817 -54.7571 2.4 41.2 -81.1 2.7606 4.7 ------ UNKNOWN
Plot creation:
Wed Jun 10 14:54:06 EDT 2015