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
13.0789 49.9376 0.0039 19.1274 -81.3989 2.7219382 48.633 TRIG_00529095
Foreground time interval of the image:
-3.100 15.349 (delta_t = 18.449 [sec])
Background time interval of the image:
-239.552 -3.100 (delta_t = 236.452 [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 1.024000
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 1.024000
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 1.024000
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 -3.100 sec. to 141.792 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61265 ( -0.0842248 0.0847006 )
Norm@50keV : 1.85319E-03 ( -8.56258e-05 8.53154e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.34 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 57 degrees of freedom
# Null hypothesis probability = 2.095182e-01
Photon flux (15-150 keV) in 144.9 sec: 0.239086 ( -0.0110452 0.0110735 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50752e-06 ( -1.2451e-07 1.25166e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.100 sec. to 141.792 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61305 ( -0.152869 0.0837005 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.85580E-03 ( -8.42877e-05 0.00070135 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.35 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 56 degrees of freedom
# Null hypothesis probability = 1.837967e-01
Photon flux (15-150 keV) in 144.9 sec: 0.239077 ( -0.011289 0.010974 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4968e-06 ( -1.29033e-07 1.38307e-07 ) ergs/cm2
Band function
Time interval is from -3.100 sec. to 141.792 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.63580E-02 ( 0.859535 0.859535 )
beta : -1.67284 ( -0.148737 0.108672 )
Epeak [keV] : 34.2363 ( -34.1198 93.3417 )
Norm@50keV : 2.63053E-02 ( -0.027105 150.584 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.16 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 55 degrees of freedom
# Null hypothesis probability = 2.102188e-01
Photon flux (15-150 keV) in 144.9 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] : 13.6180 ( )
R^2/D10^2 : 3.56961E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 199.31 using 59 PHA bins.
# Reduced chi-squared = 3.4966 for 57 degrees of freedom
# Null hypothesis probability = 1.146022e-17
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.031e-07 1.876e-08
25- 50 7.344e-07 4.028e-08
50-150 8.839e-07 8.636e-08
15-150 1.821e-06 9.781e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 178.642 (-40.2623 -178.261)
Norm : 0.965740 (-0.0475618 0.0527087)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.99 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 57 degrees of freedom
# Null hypothesis probability = 1.326787e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.532e-07 2.304e-08
25- 50 6.704e-07 7.774e-08
50-150 1.416e-06 4.859e-07
15-150 2.439e-06 5.202e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.53478 (-0.953712 1.03739)
R1^2/D10^2 : 0.222287 (-0.0767179 0.130138)
kT2 [keV] : 32.2606 (-6.3022 11.7702)
R2^2/D10^2 : 1.35521E-03 (-0.000823467 0.00147756)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.20 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 55 degrees of freedom
# Null hypothesis probability = 1.633901e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.456e-07 4.637e-08
25- 50 6.896e-07 7.404e-08
50-150 1.487e-06 3.720e-07
15-150 2.522e-06 4.340e-07
Peak spectrum fit
Power-law model
Time interval is from 0.044 sec. to 1.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66311 ( -0.108068 0.110134 )
Norm@50keV : 2.22214E-02 ( -0.00152265 0.00151174 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.17 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 57 degrees of freedom
# Null hypothesis probability = 4.319495e-01
Photon flux (15-150 keV) in 1 sec: 2.91423 ( -0.186247 0.186358 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06404e-07 ( -1.49688e-08 1.50863e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.044 sec. to 1.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.777151 ( -0.551621 0.489117 )
Epeak [keV] : 64.9848 ( -10.1407 24.7061 )
Norm@50keV : 6.53423E-02 ( -0.028882 0.0615652 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.78 using 59 PHA bins.
# Reduced chi-squared = 0.8533 for 56 degrees of freedom
# Null hypothesis probability = 7.745905e-01
Photon flux (15-150 keV) in 1 sec: 2.81119 ( -0.19399 0.1941 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92678e-07 ( -1.6473e-08 1.6736e-08 ) ergs/cm2
Band function
Time interval is from 0.044 sec. to 1.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.800143 ( -0.457588 0.394467 )
beta : -8.26028 ( 9.21203 19.212 )
Epeak [keV] : 65.4845 ( -9.18962 24.1067 )
Norm@50keV : 6.35503E-02 ( -0.0265732 0.35833 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.79 using 59 PHA bins.
# Reduced chi-squared = 0.8689 for 55 degrees of freedom
# Null hypothesis probability = 7.439919e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92349e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.0335 (-0.921111 0.997631)
R^2/D10^2 : 0.542005 (-0.127499 0.164731)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.04 using 59 PHA bins.
# Reduced chi-squared = 1.404 for 57 degrees of freedom
# Null hypothesis probability = 2.374976e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.953e-08 2.200e-09
25- 50 6.744e-08 4.810e-09
50-150 7.253e-08 1.018e-08
15-150 1.595e-07 1.210e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 138.985 (-34.3465 49.705)
Norm : 12.1583 (-0.887677 1.05547)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.67 using 59 PHA bins.
# Reduced chi-squared = 0.8889 for 57 degrees of freedom
# Null hypothesis probability = 7.100114e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.141e-08 2.695e-09
25- 50 5.756e-08 5.735e-09
50-150 1.100e-07 3.986e-08
15-150 1.990e-07 4.690e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.75729 (-1.96005 2.22036)
R1^2/D10^2 : 3.12069 (-1.72348 6.69601)
kT2 [keV] : 20.0642 (-3.79115 8.07996)
R2^2/D10^2 : 8.38786E-02 (-0.0635071 0.121429)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.85 using 59 PHA bins.
# Reduced chi-squared = 0.8881 for 55 degrees of freedom
# Null hypothesis probability = 7.074693e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.854e-08 8.770e-09
25- 50 6.061e-08 1.285e-08
50-150 1.010e-07 4.882e-08
15-150 1.901e-07 5.887e-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: 1.68672 ( -0.0638084 0.0641839 )
Norm@50keV : 9.31383E-03 ( -0.000318863 0.000317732 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.38 using 59 PHA bins.
# Reduced chi-squared = 0.7786 for 57 degrees of freedom
# Null hypothesis probability = 8.885544e-01
Photon flux (15-150 keV) in 18.45 sec: 1.23129 ( -0.0437048 0.0438213 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59276e-06 ( -5.71289e-08 5.73072e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55312 ( -0.255505 0.183382 )
Epeak [keV] : 168.491 ( )
Norm@50keV : 1.08463E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.51 using 59 PHA bins.
# Reduced chi-squared = 0.7769 for 56 degrees of freedom
# Null hypothesis probability = 8.882682e-01
Photon flux (15-150 keV) in 18.45 sec: 1.21949 ( -0.04823 0.0474 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57502e-06 ( -6.63333e-08 6.13186e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.240396 ( -2.9913 -0.468736 )
beta : -1.74925 ( 1.74418 0.0852907 )
Epeak [keV] : 36.3314 ( -9.20081 69.4945 )
Norm@50keV : 8.70959E-02 ( -0.0866047 594.835 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.89 using 59 PHA bins.
# Reduced chi-squared = 0.7435 for 55 degrees of freedom
# Null hypothesis probability = 9.216027e-01
Photon flux (15-150 keV) in 18.45 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) = 6.54e-07
S(50-100 keV) = 8.55e-07
T90 vs. Hardness ratio plot
T90 = 93.9279999136925 sec.
Hardness ratio (energy fluence ratio) = 1.30734
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.24165
Count Ratio (50-100 keV) / (15-25 keV) = 0.824869
Mask shadow pattern
IMX = 5.186808599736119E-02, IMY = 3.429166619534886E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-239.552000 -3.100000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5581 35.3184 4.7 41.9 157.7 0.8739 2.5 7.2 Cyg X-1
308.1101 41.0055 1.2 33.9 163.9 2.1290 9.3 3.2 Cyg X-3
326.1736 38.2744 4.8 20.5 153.7 0.4053 2.4 2.8 Cyg X-2
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-3.100000 15.348600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.6067 35.0894 7.3 41.9 157.4 0.1413 1.6 6.8 Cyg X-1
308.1925 40.8132 10.5 33.9 163.5 -0.0741 -1.1 9.2 Cyg X-3
326.0681 38.2003 5.9 20.6 153.5 0.0916 1.9 8.8 Cyg X-2
343.6848 7.0131 2.3 31.8 70.8 0.4275 5.1 ------ UNKNOWN
327.8820 17.5950 2.6 29.4 107.7 0.3475 4.6 ------ UNKNOWN
13.0789 49.9376 0.2 19.1 -81.4 2.7220 48.6 ------ UNKNOWN
52.6789 15.6680 2.3 57.2 -30.2 1.3469 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
57.548600 645.048600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.2834 41.0147 7.7 44.8 136.3 1.8347 1.5 8.7 Cyg X-3
326.3226 38.2995 4.2 34.8 120.5 1.8910 2.7 7.2 Cyg X-2
7.4552 10.0040 2.4 40.2 40.3 3.0789 4.8 ------ UNKNOWN
332.6017 64.9938 2.8 25.8 172.7 1.2305 4.1 ------ UNKNOWN
245.0548 66.1649 3.2 57.3 -170.4 5.1957 3.6 ------ UNKNOWN
251.8679 73.1055 3.2 50.6 -167.0 2.8319 3.6 ------ UNKNOWN
58.6156 5.0415 3.1 58.9 -24.4 7.3934 3.7 ------ UNKNOWN
66.9628 21.4285 3.3 50.8 -44.4 5.6023 3.5 ------ UNKNOWN
126.4198 74.5419 2.4 48.0 -129.0 6.9489 4.8 ------ UNKNOWN
Plot creation:
Sat May 30 19:01:10 EDT 2015