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
206.6255 33.2856 0.0136 27.7291 -137.5581 0.3223930 14.231 TRIG_00610501
Foreground time interval of the image:
0.264 3.640 (delta_t = 3.376 [sec])
Background time interval of the image:
-571.111 -556.375 (delta_t = 14.736 [sec])
-239.512 0.264 (delta_t = 239.776 [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)
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 0.264 sec. to 3.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98807 ( -0.20368 0.213875 )
Norm@50keV : 5.87742E-03 ( -0.000827155 0.000806478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.22 using 59 PHA bins.
# Reduced chi-squared = 0.9513 for 57 degrees of freedom
# Null hypothesis probability = 5.799863e-01
Photon flux (15-150 keV) in 3.376 sec: 0.876813 ( -0.0938092 0.093818 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82872e-07 ( -2.39703e-08 2.45659e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.264 sec. to 3.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99011 ( -0.651467 0.646308 )
Epeak [keV] : 9999.23 ( -9971.62 -9999.36 )
Norm@50keV : 5.86979E-03 ( -0.00309409 0.0171017 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.22 using 59 PHA bins.
# Reduced chi-squared = 0.9682 for 56 degrees of freedom
# Null hypothesis probability = 5.424611e-01
Photon flux (15-150 keV) in 3.376 sec: 0.876531 ( -0.093794 0.093768 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82761e-07 ( -3.12496e-08 2.43389e-08 ) ergs/cm2
Band function
Time interval is from 0.264 sec. to 3.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.84607 ( -3.56548 -3.56548 )
beta : -2.12441 ( -0.383589 0.281659 )
Epeak [keV] : 23.0398 ( -22.4492 14.2069 )
Norm@50keV : 34.9527 ( -34.9358 805.571 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.90 using 59 PHA bins.
# Reduced chi-squared = 0.9618 for 55 degrees of freedom
# Null hypothesis probability = 5.553620e-01
Photon flux (15-150 keV) in 3.376 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] : 8.93306 (-1.07767 1.24762)
R^2/D10^2 : 0.622334 (-0.249231 0.407512)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.54 using 59 PHA bins.
# Reduced chi-squared = 1.255 for 57 degrees of freedom
# Null hypothesis probability = 9.311039e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.252e-08 5.991e-09
25- 50 6.831e-08 9.571e-09
50-150 2.547e-08 8.832e-09
15-150 1.263e-07 1.786e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 63.9411 (-19.1626 33.9553)
Norm : 4.45082 (-0.775673 0.948549)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.63 using 59 PHA bins.
# Reduced chi-squared = 0.9760 for 57 degrees of freedom
# Null hypothesis probability = 5.266232e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.813e-08 5.229e-09
25- 50 5.914e-08 7.258e-09
50-150 7.086e-08 2.080e-08
15-150 1.681e-07 2.586e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.34348 (-1.44502 1.30613)
R1^2/D10^2 : 1.20187 (-0.504137 1.38008)
kT2 [keV] : 63.2496 (-42.2606 -64.9434)
R2^2/D10^2 : 6.17781E-04 (-0.000521747 0.010773)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.94 using 59 PHA bins.
# Reduced chi-squared = 0.9263 for 55 degrees of freedom
# Null hypothesis probability = 6.302695e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.760e-08 9.951e-09
25- 50 6.098e-08 1.638e-08
50-150 9.634e-08 5.149e-08
15-150 1.949e-07 6.428e-08
Peak spectrum fit
Power-law model
Time interval is from 0.340 sec. to 1.340 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86872 ( -0.257005 0.27423 )
Norm@50keV : 8.26970E-03 ( -0.00150231 0.00146106 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.55 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.547196e-01
Photon flux (15-150 keV) in 1 sec: 1.17134 ( -0.171575 0.171594 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.60254e-08 ( -1.34366e-08 1.38502e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.340 sec. to 1.340 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.790869 ( -1.77095 1.26576 )
Epeak [keV] : 45.6452 ( -41.5961 -45.6398 )
Norm@50keV : 3.54639E-02 ( -0.0355056 0.368194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.57 using 59 PHA bins.
# Reduced chi-squared = 0.9923 for 56 degrees of freedom
# Null hypothesis probability = 4.910456e-01
Photon flux (15-150 keV) in 1 sec: 1.12877 ( -0.178202 0.17899 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.77882e-08 ( -1.4316e-08 1.67732e-08 ) ergs/cm2
Band function
Time interval is from 0.340 sec. to 1.340 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.08880 ( 0.697531 0.697531 )
beta : -2.48547 ( 2.69084 0.92786 )
Epeak [keV] : 47.8663 ( -43.0618 31.6413 )
Norm@50keV : 2.36086E-02 ( -0.0523611 346.322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.51 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 55 degrees of freedom
# Null hypothesis probability = 4.554682e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.97349e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.3906 (-1.54214 1.83577)
R^2/D10^2 : 0.491103 (-0.226772 0.409822)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.94 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 57 degrees of freedom
# Null hypothesis probability = 3.696088e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.093e-08 2.776e-09
25- 50 2.866e-08 6.410e-09
50-150 1.669e-08 6.117e-09
15-150 5.627e-08 1.235e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.1608 (-29.2587 67.0934)
Norm : 5.58809 (-1.10556 1.41703)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.92 using 59 PHA bins.
# Reduced chi-squared = 0.9811 for 57 degrees of freedom
# Null hypothesis probability = 5.155778e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.448e-08 3.300e-09
25- 50 2.370e-08 4.315e-09
50-150 3.293e-08 1.820e-08
15-150 7.110e-08 1.973e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 40.2898 ( )
R1^2/D10^2 : 1.78071E-03 (-0.00161574 0.479281)
kT2 [keV] : 8.70552 (-4.70028 2.21342)
R2^2/D10^2 : 0.835053 (-0.745226 -0.815881)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.07 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.99 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 55 degrees of freedom
# Reduced chi-squared = 1.018 for 55 degrees of freedom
# Null hypothesis probability = 4.346692e-01
# Null hypothesis probability = 4.373385e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.353e-08 7.495e-09
25- 50 2.528e-08 1.325e-08
50-150 2.699e-08 1.543e-08
15-150 6.580e-08 3.334e-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: 1.98807 ( -0.20368 0.213875 )
Norm@50keV : 5.87742E-03 ( -0.000827155 0.000806478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.22 using 59 PHA bins.
# Reduced chi-squared = 0.9513 for 57 degrees of freedom
# Null hypothesis probability = 5.799863e-01
Photon flux (15-150 keV) in 3.376 sec: 0.876813 ( -0.0938092 0.093818 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82872e-07 ( -2.39703e-08 2.45659e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99011 ( -0.651467 0.646308 )
Epeak [keV] : 9999.23 ( -9971.62 -9999.36 )
Norm@50keV : 5.86979E-03 ( -0.00309409 0.0171017 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.22 using 59 PHA bins.
# Reduced chi-squared = 0.9682 for 56 degrees of freedom
# Null hypothesis probability = 5.424611e-01
Photon flux (15-150 keV) in 3.376 sec: 0.876531 ( -0.093794 0.093768 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82761e-07 ( -3.12493e-08 2.43754e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.84607 ( -3.56548 -3.56548 )
beta : -2.12441 ( -0.383589 0.281659 )
Epeak [keV] : 23.0398 ( -22.4492 14.2069 )
Norm@50keV : 34.9527 ( -34.9358 805.865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.90 using 59 PHA bins.
# Reduced chi-squared = 0.9618 for 55 degrees of freedom
# Null hypothesis probability = 5.553620e-01
Photon flux (15-150 keV) in 3.376 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) = 5.49e-08
S(50-100 keV) = 5.53e-08
T90 vs. Hardness ratio plot
T90 = 3.08399993181229 sec.
Hardness ratio (energy fluence ratio) = 1.00729
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.01035
Count Ratio (50-100 keV) / (15-25 keV) = 0.483185
Mask shadow pattern
IMX = -3.879169240787561E-01, IMY = 3.547370087916024E-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:
-571.111390 -556.374900
-239.512000 0.264000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4164 35.3336 2.1 27.1 129.1 1.4501 5.5 2.1 Her X-1
244.2953 5.3212 2.5 52.4 159.9 4.3873 4.5 ------ UNKNOWN
237.6555 20.5504 3.3 36.3 165.5 0.9953 3.5 ------ UNKNOWN
250.0716 65.8697 3.1 13.8 37.1 0.7472 3.7 ------ UNKNOWN
41.2806 66.8622 3.5 56.7 2.8 3.4656 3.3 ------ UNKNOWN
235.3429 50.3450 2.9 7.1 144.5 0.7608 4.0 ------ UNKNOWN
192.1409 34.6536 3.0 33.1 -116.0 1.2342 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.264000 3.640000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4328 35.2431 6.8 27.2 129.2 -0.0460 -1.7 6.1 Her X-1
264.1628 19.2900 2.6 45.3 129.4 0.3536 4.5 ------ UNKNOWN
242.7857 5.0346 2.7 52.4 161.8 0.3495 4.3 ------ UNKNOWN
206.6255 33.2856 0.8 27.7 -137.6 0.3224 14.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
58.988600 962.549900
1469.488000 1611.692200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5547 35.3496 4.5 39.2 84.8 7.0078 2.6 4.8 Her X-1
204.5508 -25.6312 2.9 59.0 -166.1 14.0825 4.1 ------ UNKNOWN
133.0755 53.3472 3.8 54.4 -33.1 10.1189 3.0 ------ UNKNOWN
Plot creation:
Sat May 30 12:45:11 EDT 2015