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
339.3530 -29.7236 0.0047 30.4418 36.3931 5.5163093 40.381 TRIG_00525671
Foreground time interval of the image:
-44.496 10.517 (delta_t = 55.013 [sec])
Background time interval of the image:
-239.584 -44.496 (delta_t = 195.088 [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)
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 -44.496 sec. to 32.604 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59255 ( -0.0741211 0.0744869 )
Norm@50keV : 5.24417E-03 ( -0.00020701 0.000206475 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.02 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 57 degrees of freedom
# Null hypothesis probability = 3.017833e-01
Photon flux (15-150 keV) in 77.1 sec: 0.672354 ( -0.0278374 0.0279529 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.78477e-06 ( -1.59459e-07 1.60269e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -44.496 sec. to 32.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49133 ( -0.291992 0.140284 )
Epeak [keV] : 262.221 ( -262.221 -262.221 )
Norm@50keV : 5.86711E-03 ( -0.000801758 0.00217128 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.64 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 56 degrees of freedom
# Null hypothesis probability = 2.815039e-01
Photon flux (15-150 keV) in 77.1 sec: 0.667516 ( -0.030542 0.030438 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.75669e-06 ( -1.79543e-07 1.77538e-07 ) ergs/cm2
Band function
Time interval is from -44.496 sec. to 32.604 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50733 ( 1.35718 6.22638 )
beta : -2.86407 ( 8.77715 18.1811 )
Epeak [keV] : 307.015 ( -147.25 -306.36 )
Norm@50keV : 5.75691E-03 ( -0.000474296 0.000274655 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.65 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 55 degrees of freedom
# Null hypothesis probability = 2.504011e-01
Photon flux (15-150 keV) in 77.1 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] : 15.2481 ( )
R^2/D10^2 : 6.76261E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 215.37 using 59 PHA bins.
# Reduced chi-squared = 3.7785 for 57 degrees of freedom
# Null hypothesis probability = 3.051232e-20
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.531e-07 1.862e-08
25- 50 1.021e-06 5.397e-08
50-150 1.627e-06 1.280e-07
15-150 2.901e-06 1.249e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 197.530 (-40.8154 -197.494)
Norm : 2.70159 (-0.106406 0.12143)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.41 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 57 degrees of freedom
# Null hypothesis probability = 2.607027e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.193e-07 3.080e-08
25- 50 9.978e-07 8.096e-08
50-150 2.182e-06 5.123e-07
15-150 3.699e-06 5.698e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.14623 (-0.939119 1.08687)
R1^2/D10^2 : 1.12025 (-0.498589 1.03107)
kT2 [keV] : 24.1244 (-2.7009 3.81859)
R2^2/D10^2 : 1.11369E-02 (-0.00466452 0.00626244)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.69 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 55 degrees of freedom
# Null hypothesis probability = 1.014791e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.369e-07 7.733e-08
25- 50 9.635e-07 9.946e-08
50-150 2.182e-06 2.552e-07
15-150 3.682e-06 3.354e-07
Peak spectrum fit
Power-law model
Time interval is from 0.056 sec. to 1.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06227 ( -0.0687323 0.0684052 )
Norm@50keV : 9.10964E-02 ( -0.00349049 0.00348844 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.58 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 57 degrees of freedom
# Null hypothesis probability = 2.036900e-01
Photon flux (15-150 keV) in 1 sec: 10.5313 ( -0.412486 0.41291 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.64224e-07 ( -4.11749e-08 4.1259e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.056 sec. to 1.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05686 ( -0.220036 0.0988122 )
Epeak [keV] : 9998.39 ( )
Norm@50keV : 9.16121E-02 ( -0.00349531 0.0285527 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.58 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 56 degrees of freedom
# Null hypothesis probability = 1.786809e-01
Photon flux (15-150 keV) in 1 sec: 10.5267 ( -0.4106 0.4135 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.66043e-07 ( -3.6871e-08 3.9787e-08 ) ergs/cm2
Band function
Time interval is from 0.056 sec. to 1.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.37251 ( -3.59019 -3.59019 )
beta : -1.08989 ( -0.0789298 0.0808638 )
Epeak [keV] : 27.3945 ( -27.1034 159.276 )
Norm@50keV : 267.633 ( -266.599 1730.18 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.07 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 55 degrees of freedom
# Null hypothesis probability = 1.882849e-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] : 21.2571 ( )
R^2/D10^2 : 0.412288 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 205.90 using 59 PHA bins.
# Reduced chi-squared = 3.6122 for 57 degrees of freedom
# Null hypothesis probability = 1.027331e-18
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.501e-08 2.730e-09
25- 50 1.813e-07 9.950e-09
50-150 6.112e-07 4.125e-08
15-150 8.276e-07 4.170e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 42.7733 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 204.87 using 59 PHA bins.
# Reduced chi-squared = 3.5942 for 57 degrees of freedom
# Null hypothesis probability = 1.497006e-18
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.065e-07 4.150e-09
25- 50 2.049e-07 9.000e-09
50-150 4.493e-07 2.075e-08
15-150 7.607e-07 3.095e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.26538 (-1.33837 1.60699)
R1^2/D10^2 : 4.79391 (-1.94117 3.62508)
kT2 [keV] : 36.8027 (-5.38758 9.4187)
R2^2/D10^2 : 6.38296E-02 (-0.0312714 0.0413936)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.04 using 59 PHA bins.
# Reduced chi-squared = 1.255 for 55 degrees of freedom
# Null hypothesis probability = 9.652588e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.244e-08 1.125e-08
25- 50 1.908e-07 2.175e-08
50-150 7.082e-07 1.014e-07
15-150 9.715e-07 1.211e-07
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: 1.53953 ( -0.0726698 0.0729421 )
Norm@50keV : 6.62224E-03 ( -0.000254058 0.000253676 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.37 using 59 PHA bins.
# Reduced chi-squared = 0.9713 for 57 degrees of freedom
# Null hypothesis probability = 5.366351e-01
Photon flux (15-150 keV) in 55.01 sec: 0.835819 ( -0.0340315 0.0341747 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.43467e-06 ( -1.41592e-07 1.42249e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47478 ( -0.28057 0.109581 )
Epeak [keV] : 432.317 ( -432.317 -432.317 )
Norm@50keV : 7.10626E-03 ( -0.000704664 0.00245518 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.20 using 59 PHA bins.
# Reduced chi-squared = 0.9857 for 56 degrees of freedom
# Null hypothesis probability = 5.052482e-01
Photon flux (15-150 keV) in 55.01 sec: 0.831915 ( -0.037286 0.036661 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.42007e-06 ( -1.57065e-07 1.52823e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47535 ( 1.29616 1.29616 )
beta : -4.83001 ( 3.61703 13.617 )
Epeak [keV] : 432.934 ( -432.934 -432.934 )
Norm@50keV : 7.10346E-03 ( -0.000269189 0.00214336 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.20 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.671809e-01
Photon flux (15-150 keV) in 55.01 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) = 9.78e-07
S(50-100 keV) = 1.30e-06
T90 vs. Hardness ratio plot
T90 = 51.7039999961853 sec.
Hardness ratio (energy fluence ratio) = 1.32924
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.18662
Count Ratio (50-100 keV) / (15-25 keV) = 0.950583
Mask shadow pattern
IMX = 4.730598618759329E-01, IMY = -3.486816869462041E-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:
-239.584000 -44.496000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5952 35.1659 4.9 51.4 170.9 1.3651 2.4 2.2 Cyg X-1
308.1895 41.0290 7.2 49.9 -177.7 0.6495 1.6 5.8 Cyg X-3
326.2617 38.4188 9.6 40.0 -163.4 0.2920 1.2 7.2 Cyg X-2
297.4891 1.8309 2.4 43.1 126.2 3.3418 4.9 ------ UNKNOWN
325.5066 17.2307 2.9 22.2 173.1 0.6468 4.0 ------ UNKNOWN
27.5421 -29.6020 2.3 54.0 -17.5 2.3665 5.0 ------ UNKNOWN
323.5791 56.8859 2.8 57.8 -156.7 4.1340 4.1 ------ UNKNOWN
30.6366 -8.3051 2.5 50.6 -44.4 4.1605 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-44.496000 10.516610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5276 35.1214 8.2 51.4 170.8 0.4650 1.4 5.7 Cyg X-1
308.3472 40.9218 0.0 49.7 -177.7 -0.1291 -0.5 10.9 Cyg X-3
325.9973 38.4052 4.5 40.0 -163.7 -0.3661 -2.6 9.6 Cyg X-2
292.9305 15.8612 2.4 49.4 144.7 2.2940 4.7 ------ UNKNOWN
339.3530 -29.7236 0.3 30.4 36.4 5.5164 40.4 ------ UNKNOWN
31.8781 -27.3290 2.5 56.6 -21.9 1.7494 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
70.516600 416.516600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
343.4090 -50.4937 2.3 21.0 -0.8 1.1676 5.0 ------ UNKNOWN
Plot creation:
Sat May 30 19:17:30 EDT 2015