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
251.9550 71.8182 0.0130 43.9846 144.0835 1.2491296 14.695 TRIG_00416076
Foreground time interval of the image:
-1.208 6.760 (delta_t = 7.968 [sec])
Background time interval of the image:
-239.048 -1.208 (delta_t = 237.840 [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 2.048000
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 2.048000
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 2.048000
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 -1.208 sec. to 6.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46189 ( -0.182066 0.182666 )
Norm@50keV : 1.08085E-02 ( -0.00114072 0.00113872 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.51 using 59 PHA bins.
# Reduced chi-squared = 0.9211 for 57 degrees of freedom
# Null hypothesis probability = 6.441854e-01
Photon flux (15-150 keV) in 7.968 sec: 1.33597 ( -0.148267 0.148805 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.22353e-07 ( -9.2679e-08 9.30806e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.208 sec. to 6.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11157 ( -0.822135 0.498815 )
Epeak [keV] : 139.397 ( -62.7101 -139.393 )
Norm@50keV : 1.57605E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.82 using 59 PHA bins.
# Reduced chi-squared = 0.9253 for 56 degrees of freedom
# Null hypothesis probability = 6.338429e-01
Photon flux (15-150 keV) in 7.968 sec: 1.31367 ( -0.15594 0.15524 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.1064e-07 ( -9.69482e-08 9.65881e-08 ) ergs/cm2
Band function
Time interval is from -1.208 sec. to 6.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13234 ( -0.458197 0.69193 )
beta : -8.56635 ( 7.51765 17.5176 )
Epeak [keV] : 144.797 ( -52.5886 -144.79 )
Norm@50keV : 1.54111E-02 ( -0.00161595 0.00959603 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.82 using 59 PHA bins.
# Reduced chi-squared = 0.9422 for 55 degrees of freedom
# Null hypothesis probability = 5.969004e-01
Photon flux (15-150 keV) in 7.968 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] : 17.6607 (-2.1221 2.4711)
R^2/D10^2 : 8.74321E-02 (-0.0321986 0.0495042)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.21 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 57 degrees of freedom
# Null hypothesis probability = 1.288333e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.377e-08 9.179e-09
25- 50 1.995e-07 2.944e-08
50-150 4.494e-07 7.924e-08
15-150 6.927e-07 9.848e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.53612 (-0.582032 0.58197)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.07 using 59 PHA bins.
# Reduced chi-squared = 0.9311 for 57 degrees of freedom
# Null hypothesis probability = 6.231454e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.099e-07 4.060e-08
25- 50 2.113e-07 7.499e-08
50-150 4.635e-07 2.091e-07
15-150 7.846e-07 3.703e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.39048 (-1.58758 2.35497)
R1^2/D10^2 : 7.47644 (-6.22438 68.7409)
kT2 [keV] : 21.8304 (-3.36245 5.08941)
R2^2/D10^2 : 3.80419E-02 (-0.0204138 0.0319154)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.09 using 59 PHA bins.
# Reduced chi-squared = 0.8926 for 55 degrees of freedom
# Null hypothesis probability = 6.986732e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.104e-07 5.230e-08
25- 50 1.803e-07 5.104e-08
50-150 5.035e-07 1.369e-07
15-150 7.942e-07 2.063e-07
Peak spectrum fit
Power-law model
Time interval is from 1.948 sec. to 2.948 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45868 ( -0.298999 0.298903 )
Norm@50keV : 1.82913E-02 ( -0.00321475 0.00321011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.64 using 59 PHA bins.
# Reduced chi-squared = 0.9411 for 57 degrees of freedom
# Null hypothesis probability = 6.017522e-01
Photon flux (15-150 keV) in 1 sec: 2.25904 ( -0.415762 0.417869 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74757e-07 ( -3.26842e-08 3.29083e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.948 sec. to 2.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09954 ( -1.41444 1.38869 )
Epeak [keV] : 134.089 ( -134.089 -134.089 )
Norm@50keV : 2.72484E-02 ( -0.0119156 0.0954937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.36 using 59 PHA bins.
# Reduced chi-squared = 0.9529 for 56 degrees of freedom
# Null hypothesis probability = 5.754241e-01
Photon flux (15-150 keV) in 1 sec: 2.22759 ( -0.42868 0.42849 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72059e-07 ( -3.4521e-08 3.4127e-08 ) ergs/cm2
Band function
Time interval is from 1.948 sec. to 2.948 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09845 ( 0.872732 5.83645 )
beta : -1.85753 ( 2.01566 12.0074 )
Epeak [keV] : 132.482 ( -129.796 -129.796 )
Norm@50keV : 2.73370E-02 ( -0.0110269 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.34 using 59 PHA bins.
# Reduced chi-squared = 0.9699 for 55 degrees of freedom
# Null hypothesis probability = 5.381412e-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] : 16.7714 (-3.39788 4.36058)
R^2/D10^2 : 0.177323 (-0.0984922 0.214476)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.26 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 57 degrees of freedom
# Null hypothesis probability = 3.587481e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.019e-08 3.448e-09
25- 50 4.462e-08 1.357e-08
50-150 8.922e-08 3.108e-08
15-150 1.440e-07 4.234e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.360 (-87.7981 -199.362)
Norm : 9.38251 (-1.6412 1.64464)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.78 using 59 PHA bins.
# Reduced chi-squared = 0.9435 for 57 degrees of freedom
# Null hypothesis probability = 5.966519e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.336e-08 1.368e-08
25- 50 4.494e-08 2.552e-08
50-150 9.857e-08 5.690e-08
15-150 1.669e-07 9.445e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.40445 (-4.74981 6.68857)
R1^2/D10^2 : 1.77142 (-1.48292 132.487)
kT2 [keV] : 26.6057 (-9.84898 -26.6244)
R2^2/D10^2 : 2.82201E-02 (-0.0274757 0.137261)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.74 using 59 PHA bins.
# Reduced chi-squared = 0.9771 for 55 degrees of freedom
# Null hypothesis probability = 5.228632e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.983e-08 1.115e-08
25- 50 4.472e-08 2.446e-08
50-150 1.069e-07 6.105e-08
15-150 1.714e-07 8.770e-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: 1.46189 ( -0.182066 0.182666 )
Norm@50keV : 1.08085E-02 ( -0.00114072 0.00113872 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.51 using 59 PHA bins.
# Reduced chi-squared = 0.9211 for 57 degrees of freedom
# Null hypothesis probability = 6.441854e-01
Photon flux (15-150 keV) in 7.968 sec: 1.33597 ( -0.148267 0.148805 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.22353e-07 ( -9.2679e-08 9.30806e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11157 ( -0.822135 0.498815 )
Epeak [keV] : 139.397 ( -62.7101 -139.393 )
Norm@50keV : 1.57605E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.82 using 59 PHA bins.
# Reduced chi-squared = 0.9253 for 56 degrees of freedom
# Null hypothesis probability = 6.338429e-01
Photon flux (15-150 keV) in 7.968 sec: 1.31367 ( -0.15594 0.15524 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.1064e-07 ( -9.69482e-08 9.65881e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13234 ( -0.458302 0.691715 )
beta : -8.56635 ( 7.51765 17.5176 )
Epeak [keV] : 144.797 ( -52.5886 -144.79 )
Norm@50keV : 1.54111E-02 ( -0.00161595 0.00959603 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.82 using 59 PHA bins.
# Reduced chi-squared = 0.9422 for 55 degrees of freedom
# Null hypothesis probability = 5.969004e-01
Photon flux (15-150 keV) in 7.968 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) = 2.00e-07
S(50-100 keV) = 2.90e-07
T90 vs. Hardness ratio plot
T90 = 6.75200003385544 sec.
Hardness ratio (energy fluence ratio) = 1.45
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.35471
Count Ratio (50-100 keV) / (15-25 keV) = 1.37379
Mask shadow pattern
IMX = -7.816647915960692E-01, IMY = -5.661738871788703E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-239.048000 -1.208000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4224 35.2152 12.7 36.6 87.0 0.4803 0.9 7.8 Her X-1
268.4815 -1.4159 11.1 46.8 28.6 -0.5508 -1.0 7.2 SW J1753.5-0127
274.0953 -14.1817 12.7 55.0 14.1 -0.9538 -0.9 10.2 GX 17+2
288.7958 10.9715 0.7 26.1 8.1 3.3169 17.4 1.6 GRS 1915+105
299.5863 35.1997 0.2 0.0 28.7 9.3805 50.0 0.2 Cyg X-1
308.0904 40.9425 1.1 8.8 -149.7 1.8814 10.5 1.1 Cyg X-3
325.9235 38.2820 0.0 21.2 -122.6 0.2614 1.3 11.9 Cyg X-2
254.5614 54.0626 2.4 36.3 119.0 1.8671 4.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.208000 6.760000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3721 35.2082 8.6 36.6 87.0 -0.1169 -1.3 9.1 Her X-1
268.2570 -1.5295 3.5 47.0 28.8 0.2947 3.3 8.1 SW J1753.5-0127
273.9134 -13.9748 1247.4 54.9 14.4 -0.0013 -0.0 6.5 GX 17+2
288.7446 10.9899 5.0 26.1 8.3 -0.0718 -2.3 4.1 GRS 1915+105
299.5161 35.0841 7.4 0.1 11.2 -0.0422 -1.5 7.9 Cyg X-1
308.2579 40.9898 6.8 8.9 -149.4 -0.0447 -1.7 7.0 Cyg X-3
326.3258 38.4117 6.6 21.6 -123.0 -0.0554 -1.7 9.0 Cyg X-2
251.9544 71.8183 0.8 44.0 144.1 1.2476 14.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
286.652590 534.152610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
45.7745 -39.6117 2.4 35.6 -35.5 1.1747 4.7 ------ UNKNOWN
303.3331 -27.4499 3.7 58.7 -159.2 4.3998 3.2 ------ UNKNOWN
Plot creation:
Sun May 31 02:01:51 EDT 2015