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
355.3053 31.2928 0.0121 33.8017 -117.8780 0.5356779 15.858 TRIG_00579683
Foreground time interval of the image:
-0.904 2.096 (delta_t = 3.000 [sec])
Background time interval of the image:
-239.904 -0.904 (delta_t = 239.000 [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 0.512000
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 0.512000
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 0.512000
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 -0.904 sec. to 2.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81095 ( -0.166826 0.173656 )
Norm@50keV : 1.14938E-02 ( -0.00125974 0.00123933 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.34 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 57 degrees of freedom
# Null hypothesis probability = 2.351738e-01
Photon flux (15-150 keV) in 3 sec: 1.59060 ( -0.154986 0.155111 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17325e-07 ( -3.50472e-08 3.54402e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.904 sec. to 2.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11179 ( -0.768158 0.657441 )
Epeak [keV] : 60.9053 ( -14.3354 135.934 )
Norm@50keV : 2.67340E-02 ( -0.0143889 0.0389246 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.99 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 56 degrees of freedom
# Null hypothesis probability = 3.011038e-01
Photon flux (15-150 keV) in 3 sec: 1.54786 ( -0.16089 0.16021 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.04317e-07 ( -3.65082e-08 3.7353e-08 ) ergs/cm2
Band function
Time interval is from -0.904 sec. to 2.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11324 ( -0.731219 0.696961 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 61.0095 ( -14.4458 107.678 )
Norm@50keV : 2.66612E-02 ( -0.0143185 0.0391211 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.00 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 55 degrees of freedom
# Null hypothesis probability = 2.692255e-01
Photon flux (15-150 keV) in 3 sec: 1.56805 ( 5.43195 -0.17934 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.03777e-07 ( -3.03756e-07 -3.5739e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.2399 (-1.43398 1.58436)
R^2/D10^2 : 0.270328 (-0.0918985 0.140661)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.60 using 59 PHA bins.
# Reduced chi-squared = 1.431 for 57 degrees of freedom
# Null hypothesis probability = 1.798756e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.014e-08 5.394e-09
25- 50 1.058e-07 1.266e-08
50-150 1.185e-07 2.556e-08
15-150 2.545e-07 3.171e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 108.028 (-32.7642 49.636)
Norm : 6.80904 (-0.827803 1.1076)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.45 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.198434e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.336e-08 7.635e-09
25- 50 9.367e-08 1.102e-08
50-150 1.584e-07 6.631e-08
15-150 3.054e-07 6.802e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.83013 (-0.937084 1.20405)
R1^2/D10^2 : 18.7231 (-13.3759 61.3006)
kT2 [keV] : 16.8004 (-2.20567 2.81302)
R2^2/D10^2 : 9.89405E-02 (-0.0448667 0.0712766)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.02 using 59 PHA bins.
# Reduced chi-squared = 0.9822 for 55 degrees of freedom
# Null hypothesis probability = 5.119877e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.835e-08 2.669e-08
25- 50 8.815e-08 2.356e-08
50-150 1.507e-07 4.623e-08
15-150 2.972e-07 7.610e-08
Peak spectrum fit
Power-law model
Time interval is from 0.096 sec. to 1.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80053 ( -0.166993 0.174542 )
Norm@50keV : 1.95373E-02 ( -0.00231169 0.00228194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.45 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 57 degrees of freedom
# Null hypothesis probability = 2.597171e-01
Photon flux (15-150 keV) in 1 sec: 2.69275 ( -0.289136 0.289345 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79858e-07 ( -2.15e-08 2.16928e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.096 sec. to 1.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.146469 ( -1.06384 0.86431 )
Epeak [keV] : 54.3873 ( -7.38308 11.6237 )
Norm@50keV : 0.140946 ( -0.0894009 0.335658 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.08 using 59 PHA bins.
# Reduced chi-squared = 0.9122 for 56 degrees of freedom
# Null hypothesis probability = 6.610477e-01
Photon flux (15-150 keV) in 1 sec: 2.57709 ( -0.29364 0.29759 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69483e-07 ( -2.1117e-08 2.1845e-08 ) ergs/cm2
Band function
Time interval is from 0.096 sec. to 1.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.147376 ( -0.645361 1.38365 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 54.3703 ( -7.37547 11.6223 )
Norm@50keV : 0.140855 ( -0.0893211 0.336176 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.09 using 59 PHA bins.
# Reduced chi-squared = 0.9288 for 55 degrees of freedom
# Null hypothesis probability = 6.249542e-01
Photon flux (15-150 keV) in 1 sec: 2.58035 ( 4.41965 -0.29619 ) 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] : 13.3640 (-1.29454 1.41279)
R^2/D10^2 : 0.478237 (-0.149627 0.216236)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.26 using 59 PHA bins.
# Reduced chi-squared = 0.9870 for 57 degrees of freedom
# Null hypothesis probability = 5.028786e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.810e-08 3.210e-09
25- 50 6.420e-08 8.400e-09
50-150 7.364e-08 1.551e-08
15-150 1.559e-07 1.860e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 98.7685 (-27.127 47.0079)
Norm : 12.2016 (-1.62748 1.86469)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.24 using 59 PHA bins.
# Reduced chi-squared = 0.9868 for 57 degrees of freedom
# Null hypothesis probability = 5.033792e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.189e-08 5.100e-09
25- 50 5.501e-08 6.990e-09
50-150 8.851e-08 3.375e-08
15-150 1.754e-07 3.815e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.19341 (-1.1291 1.55621)
R1^2/D10^2 : 56.2707 (-49.3565 852.721)
kT2 [keV] : 14.9413 (-1.6601 2.02149)
R2^2/D10^2 : 0.291748 (-0.117284 0.161056)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.19 using 59 PHA bins.
# Reduced chi-squared = 0.8034 for 55 degrees of freedom
# Null hypothesis probability = 8.514409e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.899e-08 1.120e-08
25- 50 5.679e-08 1.294e-08
50-150 8.194e-08 2.108e-08
15-150 1.677e-07 3.300e-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: 1.81095 ( -0.166826 0.173656 )
Norm@50keV : 1.14938E-02 ( -0.00125974 0.00123933 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.34 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 57 degrees of freedom
# Null hypothesis probability = 2.351738e-01
Photon flux (15-150 keV) in 3 sec: 1.59060 ( -0.154986 0.155111 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17325e-07 ( -3.50472e-08 3.54402e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11179 ( -0.768158 0.657441 )
Epeak [keV] : 60.9053 ( -14.3354 135.934 )
Norm@50keV : 2.67340E-02 ( -0.0143889 0.0389246 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.99 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 56 degrees of freedom
# Null hypothesis probability = 3.011038e-01
Photon flux (15-150 keV) in 3 sec: 1.54786 ( -0.16089 0.16021 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.04317e-07 ( -3.65082e-08 3.7353e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11324 ( -0.731229 0.696961 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 61.0095 ( -14.4458 107.678 )
Norm@50keV : 2.66612E-02 ( -0.0143185 0.0391211 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.00 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 55 degrees of freedom
# Null hypothesis probability = 2.692255e-01
Photon flux (15-150 keV) in 3 sec: 1.56805 ( 5.43195 -0.17934 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.03777e-07 ( -3.03756e-07 -3.5739e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 8.97e-08
S(50-100 keV) = 1.02e-07
T90 vs. Hardness ratio plot
T90 = 3 sec.
Hardness ratio (energy fluence ratio) = 1.13712
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.0357
Count Ratio (50-100 keV) / (15-25 keV) = 0.77326
Mask shadow pattern
IMX = -3.130452807927193E-01, IMY = 5.917884229788045E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-239.904000 -0.904000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
20.5598 -2.4743 2.8 38.4 168.7 1.1820 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.904000 2.096000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
51.5257 14.8077 2.1 23.5 102.1 0.1342 5.4 ------ UNKNOWN
50.0379 20.4834 2.4 18.2 95.2 0.1017 4.8 ------ UNKNOWN
355.3053 31.2928 0.7 33.8 -117.9 0.5357 15.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
70.596590 962.130200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.1376 40.9552 1.1 38.8 -52.7 10.2615 10.8 1.3 Cyg X-3
326.1448 38.4101 12.1 24.9 -55.9 0.5748 1.0 5.5 Cyg X-2
33.3947 64.8508 3.3 40.9 33.0 3.2974 3.5 ------ UNKNOWN
317.8438 82.2054 2.7 52.7 3.4 5.7863 4.3 ------ UNKNOWN
345.0193 52.8183 3.0 22.8 -6.8 1.8147 3.8 ------ UNKNOWN
336.4192 64.2598 3.5 35.0 -4.8 2.1399 3.3 ------ UNKNOWN
351.0033 -27.6010 3.0 59.0 -166.1 12.8080 3.8 ------ UNKNOWN
315.2156 12.9315 4.0 41.1 -97.9 8.2562 2.9 ------ UNKNOWN
321.2466 1.0530 3.6 44.2 -117.1 6.9745 3.2 ------ UNKNOWN
Plot creation:
Sat May 30 15:01:34 EDT 2015