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
314.2204 53.2953 0.0050 28.0762 141.1999 1.8206186 38.898 TRIG_00529606
Foreground time interval of the image:
-2.672 10.853 (delta_t = 13.525 [sec])
Background time interval of the image:
-594.147 -498.933 (delta_t = 95.214 [sec])
-239.448 -2.672 (delta_t = 236.776 [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 -2.672 sec. to 52.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35608 ( -0.0833385 0.0831225 )
Norm@50keV : 3.57321E-03 ( -0.000168773 0.000168739 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.02 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 57 degrees of freedom
# Null hypothesis probability = 4.373934e-01
Photon flux (15-150 keV) in 54.73 sec: 0.431010 ( -0.021181 0.0212156 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90742e-06 ( -9.87176e-08 9.90925e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.672 sec. to 52.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.846603 ( -0.377314 0.346309 )
Epeak [keV] : 118.289 ( -29.8652 131.461 )
Norm@50keV : 6.30297E-03 ( -0.00197681 0.00319996 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.49 using 59 PHA bins.
# Reduced chi-squared = 0.9195 for 56 degrees of freedom
# Null hypothesis probability = 6.459442e-01
Photon flux (15-150 keV) in 54.73 sec: 0.419854 ( -0.022432 0.02244 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83851e-06 ( -1.11102e-07 1.10379e-07 ) ergs/cm2
Band function
Time interval is from -2.672 sec. to 52.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.108551 ( -0.700842 1.71497 )
beta : -1.62095 ( -0.32411 0.182995 )
Epeak [keV] : 63.6723 ( -25.6888 56.774 )
Norm@50keV : 1.73946E-02 ( -0.0113331 0.19398 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.44 using 59 PHA bins.
# Reduced chi-squared = 0.8808 for 55 degrees of freedom
# Null hypothesis probability = 7.216608e-01
Photon flux (15-150 keV) in 54.73 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] : 16.4776 ( )
R^2/D10^2 : 3.63110E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 117.14 using 59 PHA bins.
# Reduced chi-squared = 2.0551 for 57 degrees of freedom
# Null hypothesis probability = 4.785335e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.108e-07 1.084e-08
25- 50 4.779e-07 3.166e-08
50-150 9.168e-07 8.100e-08
15-150 1.506e-06 8.647e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.79423 (-0.0849379 0.0849252)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.72 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 57 degrees of freedom
# Null hypothesis probability = 1.374713e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.446e-07 1.382e-08
25- 50 4.705e-07 2.435e-08
50-150 1.032e-06 5.528e-08
15-150 1.747e-06 9.140e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.79927 (-1.63466 1.64125)
R1^2/D10^2 : 0.143503 (-0.0492921 0.0935658)
kT2 [keV] : 35.8201 (-8.64593 20.7387)
R2^2/D10^2 : 1.90055E-03 (-0.00139911 0.00309793)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.47 using 59 PHA bins.
# Reduced chi-squared = 0.8994 for 55 degrees of freedom
# Null hypothesis probability = 6.851561e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.711e-07 2.799e-08
25- 50 4.909e-07 6.729e-08
50-150 1.196e-06 4.801e-07
15-150 1.858e-06 5.358e-07
Peak spectrum fit
Power-law model
Time interval is from 4.492 sec. to 5.492 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27810 ( -0.190844 0.188847 )
Norm@50keV : 1.28997E-02 ( -0.00149229 0.00148949 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.38 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 57 degrees of freedom
# Null hypothesis probability = 3.219324e-01
Photon flux (15-150 keV) in 1 sec: 1.53293 ( -0.179443 0.179645 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28169e-07 ( -1.64448e-08 1.6596e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.492 sec. to 5.492 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.676560 ( -0.962937 0.684604 )
Epeak [keV] : 110.139 ( -41.3201 -110.136 )
Norm@50keV : 2.61439E-02 ( -0.0141262 0.0527075 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.71 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 56 degrees of freedom
# Null hypothesis probability = 3.422949e-01
Photon flux (15-150 keV) in 1 sec: 1.50432 ( -0.18474 0.18406 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22525e-07 ( -1.8633e-08 1.8401e-08 ) ergs/cm2
Band function
Time interval is from 4.492 sec. to 5.492 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.80207 -5 )
beta : -1.44844 ( -0.302218 0.232724 )
Epeak [keV] : 28.6373 ( -7.26345 6.40789 )
Norm@50keV : 528.037 ( -60.0871 2475.23 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.009418e-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] : 16.2614 (-2.16917 2.61459)
R^2/D10^2 : 0.140701 (-0.0562532 0.0889823)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.00 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 57 degrees of freedom
# Null hypothesis probability = 1.156070e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.664e-09 1.794e-09
25- 50 3.270e-08 5.225e-09
50-150 6.080e-08 1.406e-08
15-150 1.012e-07 1.603e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.33325 (-0.73584 0.73579)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.37 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 57 degrees of freedom
# Null hypothesis probability = 2.088677e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.577e-08 8.905e-09
25- 50 3.034e-08 1.658e-08
50-150 6.654e-08 3.675e-08
15-150 1.126e-07 5.660e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.3138 (-5.69184 2.55563)
R1^2/D10^2 : 0.306478 (-0.161382 1.43944)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 1.83636E-04 (-8.15521e-05 0.00095453)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.17 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.08 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 55 degrees of freedom
# Reduced chi-squared = 1.056 for 55 degrees of freedom
# Null hypothesis probability = 3.592741e-01
# Null hypothesis probability = 3.624887e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.032e-08 3.628e-09
25- 50 3.381e-08 1.099e-08
50-150 7.968e-08 5.155e-08
15-150 1.238e-07 6.035e-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: 1.15361 ( -0.0783269 0.0776043 )
Norm@50keV : 9.15026E-03 ( -0.000411 0.000410806 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.04 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 57 degrees of freedom
# Null hypothesis probability = 3.011303e-01
Photon flux (15-150 keV) in 13.52 sec: 1.06757 ( -0.0499445 0.050017 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27216e-06 ( -6.14936e-08 6.16457e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.656726 ( -0.339642 0.31469 )
Epeak [keV] : 150.373 ( -39.5335 152.472 )
Norm@50keV : 1.54591E-02 ( -0.00426925 0.00640707 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.46 using 59 PHA bins.
# Reduced chi-squared = 0.9725 for 56 degrees of freedom
# Null hypothesis probability = 5.333138e-01
Photon flux (15-150 keV) in 13.52 sec: 1.04361 ( -0.052056 0.0521 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23794e-06 ( -6.6463e-08 6.61601e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.704833 ( -1.16172 -0.0791356 )
beta : -1.33100 ( 1.35403 0.158149 )
Epeak [keV] : 54.0330 ( -35.2553 118.05 )
Norm@50keV : 0.114606 ( -0.113498 65.2487 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.15 using 59 PHA bins.
# Reduced chi-squared = 0.9481 for 55 degrees of freedom
# Null hypothesis probability = 5.843115e-01
Photon flux (15-150 keV) in 13.52 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) = 4.38e-07
S(50-100 keV) = 6.84e-07
T90 vs. Hardness ratio plot
T90 = 39.0119999051094 sec.
Hardness ratio (energy fluence ratio) = 1.56164
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.66594
Count Ratio (50-100 keV) / (15-25 keV) = 1.29175
Mask shadow pattern
IMX = -4.157109539910061E-01, IMY = -3.342416998680984E-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:
-594.147380 -498.933500
-239.448000 -2.672000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.1476 40.9679 2.4 40.1 132.5 2.8999 4.8 1.9 Cyg X-3
326.0154 38.3832 11.5 34.9 111.1 -0.5102 -1.0 8.2 Cyg X-2
79.4888 36.3134 3.8 50.7 -44.5 4.0345 3.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.672000 10.852600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.0158 40.8175 18.5 40.3 132.4 -0.0639 -0.6 9.2 Cyg X-3
326.3443 38.4330 74.7 34.8 110.7 0.0138 0.2 10.5 Cyg X-2
314.2204 53.2953 0.3 28.1 141.2 1.8202 38.9 ------ UNKNOWN
117.4192 65.6928 2.1 40.9 -95.0 0.7750 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
59.452600 228.452600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5619 35.4492 4.7 44.7 -178.7 -0.5776 -2.5 8.2 Her X-1
299.6233 35.2301 1.2 20.8 125.4 1.3738 9.4 2.4 Cyg X-1
308.1465 40.9675 1.1 13.0 110.8 1.4306 10.5 1.9 Cyg X-3
325.9662 38.2426 4.7 17.1 57.0 0.3570 2.5 10.8 Cyg X-2
265.7856 17.2918 3.0 51.9 155.1 2.5901 3.8 ------ UNKNOWN
240.8943 29.3230 2.5 57.2 -173.8 3.0801 4.6 ------ UNKNOWN
228.9446 36.7436 4.3 58.7 -159.2 2.8841 2.7 ------ UNKNOWN
Plot creation:
Sat May 30 18:55:13 EDT 2015