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
136.4723 21.4826 0.0032 32.2633 179.5052 12.7593574 60.496 TRIG_00420247
Foreground time interval of the image:
-1.800 94.816 (delta_t = 96.616 [sec])
Background time interval of the image:
-179.896 -1.800 (delta_t = 178.096 [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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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 -1.800 sec. to 94.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06259 ( -0.0451534 0.0449007 )
Norm@50keV : 8.63100E-03 ( -0.000200423 0.000199663 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.17 using 59 PHA bins.
# Reduced chi-squared = 0.8450 for 57 degrees of freedom
# Null hypothesis probability = 7.913286e-01
Photon flux (15-150 keV) in 96.62 sec: 0.997824 ( -0.0242867 0.0243957 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.82584e-06 ( -2.11235e-07 2.11775e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.800 sec. to 94.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05699 ( )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 8.67839E-03 ( -0.000200643 0.000193694 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.42 using 59 PHA bins.
# Reduced chi-squared = 0.8646 for 56 degrees of freedom
# Null hypothesis probability = 7.542616e-01
Photon flux (15-150 keV) in 96.62 sec: 0.997047 ( -0.023573 0.024633 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.81992e-06 ( -2.04786e-07 2.20429e-07 ) ergs/cm2
Band function
Time interval is from -1.800 sec. to 94.816 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.921453 ( 0.836492 0.836492 )
beta : -1.06325 ( -0.0449035 0.045164 )
Epeak [keV] : 181.692 ( -61.743 -61.743 )
Norm@50keV : 1.10471E-02 ( -0.00261268 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.13 using 59 PHA bins.
# Reduced chi-squared = 0.8750 for 55 degrees of freedom
# Null hypothesis probability = 7.325151e-01
Photon flux (15-150 keV) in 96.62 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] : 22.8609 ( )
R^2/D10^2 : 2.99815E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 443.67 using 59 PHA bins.
# Reduced chi-squared = 7.7836 for 57 degrees of freedom
# Null hypothesis probability = 2.974325e-61
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.752e-07 1.304e-08
25- 50 1.488e-06 5.556e-08
50-150 5.809e-06 2.048e-07
15-150 7.572e-06 2.203e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 4.26910 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 422.07 using 59 PHA bins.
# Reduced chi-squared = 7.4048 for 57 degrees of freedom
# Null hypothesis probability = 3.712692e-57
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.027e-06 2.609e-08
25- 50 1.976e-06 4.638e-08
50-150 4.333e-06 1.082e-07
15-150 7.336e-06 1.773e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.71491 (-0.805353 0.878932)
R1^2/D10^2 : 0.403321 (-0.105089 0.151114)
kT2 [keV] : 41.7413 (-4.39307 6.12033)
R2^2/D10^2 : 4.22820E-03 (-0.00133776 0.00162557)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.28 using 59 PHA bins.
# Reduced chi-squared = 0.9142 for 55 degrees of freedom
# Null hypothesis probability = 6.552146e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.552e-07 5.280e-08
25- 50 1.758e-06 8.937e-08
50-150 6.583e-06 4.826e-07
15-150 8.996e-06 4.068e-07
Peak spectrum fit
Power-law model
Time interval is from 0.156 sec. to 1.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.725094 ( -0.0716729 0.0707733 )
Norm@50keV : 6.69428E-02 ( -0.00269793 0.00268656 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.10 using 59 PHA bins.
# Reduced chi-squared = 0.8790 for 57 degrees of freedom
# Null hypothesis probability = 7.294144e-01
Photon flux (15-150 keV) in 1 sec: 7.72372 ( -0.300732 0.300965 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.08014e-07 ( -3.43193e-08 3.44134e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.156 sec. to 1.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.717132 ( -0.2387 0.111865 )
Epeak [keV] : 9997.97 ( )
Norm@50keV : 6.74530E-02 ( -0.0025774 0.022632 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.08 using 59 PHA bins.
# Reduced chi-squared = 0.8943 for 56 degrees of freedom
# Null hypothesis probability = 6.973739e-01
Photon flux (15-150 keV) in 1 sec: 7.70007 ( -0.29369 0.33882 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.08918e-07 ( -3.6619e-08 3.3581e-08 ) ergs/cm2
Band function
Time interval is from 0.156 sec. to 1.156 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.990578 ( 0.990578 0.990578 )
beta : -0.725094 ( -0.0707702 0.0716729 )
Epeak [keV] : 12.1382 ( -12.1382 -12.1382 )
Norm@50keV : 0.100718 ( -0.025374 1.32998e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.10 using 59 PHA bins.
# Reduced chi-squared = 0.9109 for 55 degrees of freedom
# Null hypothesis probability = 6.618772e-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] : 27.4729 ( )
R^2/D10^2 : 0.151332 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 141.05 using 59 PHA bins.
# Reduced chi-squared = 2.4745 for 57 degrees of freedom
# Null hypothesis probability = 4.477632e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.883e-08 1.545e-09
25- 50 1.118e-07 7.100e-09
50-150 6.137e-07 3.640e-08
15-150 7.444e-07 3.650e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 29.0061 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 398.04 using 59 PHA bins.
# Reduced chi-squared = 6.9831 for 57 degrees of freedom
# Null hypothesis probability = 1.236413e-52
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.223e-08 3.065e-09
25- 50 1.389e-07 7.000e-09
50-150 3.047e-07 1.405e-08
15-150 5.159e-07 2.540e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.56719 (-1.70153 2.11933)
R1^2/D10^2 : 2.21740 (-1.02783 2.23857)
kT2 [keV] : 41.4661 (-5.6791 9.80143)
R2^2/D10^2 : 4.26583E-02 (-0.0188329 0.0226164)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.80 using 59 PHA bins.
# Reduced chi-squared = 0.9236 for 55 degrees of freedom
# Null hypothesis probability = 6.358701e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.004e-08 8.260e-09
25- 50 1.241e-07 1.692e-08
50-150 6.543e-07 7.685e-08
15-150 8.185e-07 1.056e-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: 1.06259 ( -0.0451534 0.0449007 )
Norm@50keV : 8.63100E-03 ( -0.000200423 0.000199663 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.17 using 59 PHA bins.
# Reduced chi-squared = 0.8450 for 57 degrees of freedom
# Null hypothesis probability = 7.913286e-01
Photon flux (15-150 keV) in 96.62 sec: 0.997824 ( -0.0242867 0.0243957 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.82584e-06 ( -2.11235e-07 2.11775e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05699 ( )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 8.67839E-03 ( -0.000200643 0.000193694 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.42 using 59 PHA bins.
# Reduced chi-squared = 0.8646 for 56 degrees of freedom
# Null hypothesis probability = 7.542616e-01
Photon flux (15-150 keV) in 96.62 sec: 0.997047 ( -0.023573 0.024633 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.81992e-06 ( -2.04786e-07 2.20429e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.836492 ( 0.836492 0.836492 )
beta : -1.06260 ( -0.0449035 0.045164 )
Epeak [keV] : 61.7430 ( -61.743 -61.743 )
Norm@50keV : 1.49420E-02 ( -0.00650514 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.17 using 59 PHA bins.
# Reduced chi-squared = 0.8758 for 55 degrees of freedom
# Null hypothesis probability = 7.311658e-01
Photon flux (15-150 keV) in 96.62 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) = 1.70e-06
S(50-100 keV) = 3.26e-06
T90 vs. Hardness ratio plot
T90 = 78.8679999709129 sec.
Hardness ratio (energy fluence ratio) = 1.91765
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.62913
Count Ratio (50-100 keV) / (15-25 keV) = 1.77416
Mask shadow pattern
IMX = -6.312546461430615E-01, IMY = -5.451091616165411E-03
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-179.896000 -1.800000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
144.4444 12.0801 2.3 39.0 162.2 1.7342 5.0 ------ UNKNOWN
129.7968 0.6346 4.6 54.1 177.2 2.2006 2.5 ------ UNKNOWN
271.4235 62.2951 2.9 56.8 -5.2 3.7787 4.0 ------ UNKNOWN
101.8831 16.8880 3.8 54.1 -143.0 3.7528 3.1 ------ UNKNOWN
93.3142 41.1347 2.5 43.1 -112.2 4.1873 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.800000 94.816000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3003 -2.7463 1.8 55.6 169.6 6.5945 6.3 ------ UNKNOWN
185.3510 51.9254 2.3 18.7 37.5 0.8663 5.0 ------ UNKNOWN
136.4724 21.4826 0.2 32.3 179.5 12.7599 60.5 ------ UNKNOWN
262.4146 76.1546 2.0 45.6 -16.5 1.7878 5.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
247.404580 962.199000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9781 -15.6416 0.4 29.3 60.5 27.0111 32.8 0.1 Sco X-1
254.2454 35.3921 4.6 24.0 -146.6 1.4165 2.5 10.8 Her X-1
256.4835 -36.5135 3.1 47.9 37.5 -9.1992 -3.7 5.9 GX 349+2
263.1202 -24.6950 29.0 36.7 27.3 0.3326 0.4 6.8 GX 1+4
268.3567 -1.3336 7.8 17.5 -6.2 0.8713 1.5 7.2 SW J1753.5-0127
270.3468 -25.0247 3.7 38.9 17.2 2.4072 3.1 4.7 GX 5-1
270.4002 -25.7011 5.8 39.6 17.6 1.5866 2.0 5.9 GRS 1758-258
273.9063 -13.9922 3.1 30.8 2.8 2.3009 3.8 6.4 GX 17+2
276.0203 -30.3036 72.1 45.8 13.7 0.1835 0.2 6.2 H1820-303
284.8408 -24.8773 878.0 45.7 0.4 0.0131 0.0 10.9 HT1900.1-2455
288.7843 10.9294 1.2 31.8 -54.7 8.5203 9.8 1.3 GRS 1915+105
262.8758 -33.9086 10.3 45.8 30.1 1.8023 1.1 7.2 GX 354-0
273.8078 -7.0146 2.8 25.3 -6.5 2.3979 4.2 ------ UNKNOWN
294.0051 -29.4614 2.4 54.7 -3.1 8.9023 4.9 ------ UNKNOWN
269.6943 57.3559 4.2 47.1 -132.6 5.7675 2.8 ------ UNKNOWN
286.0595 46.4473 3.6 43.1 -112.4 8.7316 3.2 ------ UNKNOWN
Plot creation:
Sun May 31 01:47:43 EDT 2015