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
317.3872 -8.7625 0.0036 34.5467 158.8477 2.5092686 52.774 TRIG_00156467
Foreground time interval of the image:
-3.316 3.484 (delta_t = 6.800 [sec])
Background time interval of the image:
-51.843 -3.316 (delta_t = 48.527 [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 -3.316 sec. to 3.484 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35664 ( -0.0558196 0.0557072 )
Norm@50keV : 2.44893E-02 ( -0.000757394 0.000757376 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.98 using 59 PHA bins.
# Reduced chi-squared = 1.245 for 57 degrees of freedom
# Null hypothesis probability = 1.008992e-01
Photon flux (15-150 keV) in 6.8 sec: 2.95431 ( -0.0983505 0.0985329 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62403e-06 ( -5.35595e-08 5.36294e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.316 sec. to 3.484 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12629 ( -0.226412 0.212862 )
Epeak [keV] : 209.569 ( -76.9706 919.895 )
Norm@50keV : 3.12754E-02 ( -0.00607086 0.00824488 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.63 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 56 degrees of freedom
# Null hypothesis probability = 1.371989e-01
Photon flux (15-150 keV) in 6.8 sec: 2.91605 ( -0.10395 0.10422 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60394e-06 ( -5.75348e-08 5.72696e-08 ) ergs/cm2
Band function
Time interval is from -3.316 sec. to 3.484 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.400324 ( -0.290371 0.532511 )
beta : -1.48925 ( -0.130255 0.109317 )
Epeak [keV] : 67.1752 ( -43.9096 69.6244 )
Norm@50keV : 8.45109E-02 ( -0.048904 419.115 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.37 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 55 degrees of freedom
# Null hypothesis probability = 2.308275e-01
Photon flux (15-150 keV) in 6.8 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] : 17.5496 ( )
R^2/D10^2 : 0.198718 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 276.11 using 59 PHA bins.
# Reduced chi-squared = 4.8441 for 57 degrees of freedom
# Null hypothesis probability = 1.702354e-30
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.399e-08 5.474e-09
25- 50 3.810e-07 1.615e-08
50-150 8.459e-07 4.488e-08
15-150 1.311e-06 4.624e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 12.4006 (-0.386168 0.386026)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 108.80 using 59 PHA bins.
# Reduced chi-squared = 1.9087 for 57 degrees of freedom
# Null hypothesis probability = 4.331335e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.100e-07 6.902e-09
25- 50 4.039e-07 1.299e-08
50-150 8.858e-07 2.924e-08
15-150 1.500e-06 4.794e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.40571 (-0.941568 0.974733)
R1^2/D10^2 : 1.11777 (-0.282202 0.419435)
kT2 [keV] : 37.7511 (-5.58273 8.75721)
R2^2/D10^2 : 1.18714E-02 (-0.00555206 0.00825608)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.13 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 55 degrees of freedom
# Null hypothesis probability = 2.652030e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.492e-07 1.465e-08
25- 50 4.077e-07 2.822e-08
50-150 1.053e-06 1.778e-07
15-150 1.610e-06 1.941e-07
Peak spectrum fit
Power-law model
Time interval is from -0.076 sec. to 0.924 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29912 ( -0.0696675 0.0696745 )
Norm@50keV : 6.03769E-02 ( -0.00247541 0.00247517 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.86 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 57 degrees of freedom
# Null hypothesis probability = 1.178458e-01
Photon flux (15-150 keV) in 1 sec: 7.20195 ( -0.305059 0.305339 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.96761e-07 ( -2.68822e-08 2.69478e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.076 sec. to 0.924 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.889568 ( -0.293391 0.274956 )
Epeak [keV] : 146.482 ( -40.0061 174.475 )
Norm@50keV : 9.45515E-02 ( -0.0240426 0.0348189 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.19 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 56 degrees of freedom
# Null hypothesis probability = 2.373631e-01
Photon flux (15-150 keV) in 1 sec: 7.08746 ( -0.31375 0.31397 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.84584e-07 ( -2.8749e-08 2.8581e-08 ) ergs/cm2
Band function
Time interval is from -0.076 sec. to 0.924 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 8.89558E-02 ( -0.671762 3.22257 )
beta : -1.51415 ( -0.178951 0.149097 )
Epeak [keV] : 59.9225 ( -29.5012 39.6751 )
Norm@50keV : 0.373199 ( -0.255676 55.7482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.68 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 55 degrees of freedom
# Null hypothesis probability = 3.765013e-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] : 17.2177 ( )
R^2/D10^2 : 0.536841 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 171.12 using 59 PHA bins.
# Reduced chi-squared = 3.0021 for 57 degrees of freedom
# Null hypothesis probability = 2.431678e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.230e-08 2.595e-09
25- 50 1.443e-07 7.950e-09
50-150 3.067e-07 2.175e-08
15-150 4.834e-07 2.495e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 29.9676 (-1.23998 1.23978)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 101.71 using 59 PHA bins.
# Reduced chi-squared = 1.7845 for 57 degrees of freedom
# Null hypothesis probability = 2.503667e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.464e-08 3.195e-09
25- 50 1.436e-07 6.600e-09
50-150 3.149e-07 1.325e-08
15-150 5.331e-07 2.575e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.63847 (-1.2001 1.26776)
R1^2/D10^2 : 2.48083 (-0.724718 1.15385)
kT2 [keV] : 36.9291 (-6.53216 11.7368)
R2^2/D10^2 : 3.16178E-02 (-0.0179996 0.0295525)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.44 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.580907e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.219e-08 7.560e-09
25- 50 1.484e-07 1.885e-08
50-150 3.892e-07 1.163e-07
15-150 5.897e-07 1.286e-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: 1.35664 ( -0.0558196 0.0557072 )
Norm@50keV : 2.44893E-02 ( -0.000757394 0.000757376 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.98 using 59 PHA bins.
# Reduced chi-squared = 1.245 for 57 degrees of freedom
# Null hypothesis probability = 1.008992e-01
Photon flux (15-150 keV) in 6.8 sec: 2.95431 ( -0.0983505 0.0985329 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62403e-06 ( -5.35595e-08 5.36294e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12629 ( -0.226412 0.212862 )
Epeak [keV] : 209.569 ( -76.9706 1452.8 )
Norm@50keV : 3.12754E-02 ( -0.00607086 0.00824488 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.63 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 56 degrees of freedom
# Null hypothesis probability = 1.371989e-01
Photon flux (15-150 keV) in 6.8 sec: 2.91605 ( -0.10395 0.10422 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60394e-06 ( -5.75348e-08 5.72696e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.400324 ( -0.290371 0.532511 )
beta : -1.48925 ( -0.130255 0.109317 )
Epeak [keV] : 67.1752 ( -43.9096 69.6244 )
Norm@50keV : 8.45109E-02 ( -0.0508051 419.102 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.37 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 55 degrees of freedom
# Null hypothesis probability = 2.308275e-01
Photon flux (15-150 keV) in 6.8 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) = 3.73e-07
S(50-100 keV) = 5.83e-07
T90 vs. Hardness ratio plot
T90 = 4.55200001597404 sec.
Hardness ratio (energy fluence ratio) = 1.563
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.68259
Count Ratio (50-100 keV) / (15-25 keV) = 1.37689
Mask shadow pattern
IMX = -6.420951896159968E-01, IMY = -2.484374243543705E-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:
-51.843410 -3.316000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.8513 11.0461 7.8 47.5 -150.8 0.2107 1.5 6.8 GRS 1915+105
299.6241 35.2224 0.9 36.8 -114.8 1.5580 12.3 2.1 Cyg X-1
307.9639 40.8999 4.7 33.0 -101.1 0.2546 2.4 7.3 Cyg X-3
325.9388 38.3711 8.9 21.3 -83.5 0.0962 1.3 11.4 Cyg X-2
23.8111 4.4776 2.4 47.6 44.4 1.3237 4.8 ------ UNKNOWN
303.3412 -23.4899 2.4 54.4 161.3 1.6638 4.9 ------ UNKNOWN
340.5935 36.8177 2.0 17.5 -49.6 0.3582 5.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-3.316000 3.484000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.8074 11.1652 0.0 47.5 -150.6 -0.0604 -0.8 13.2 GRS 1915+105
299.7005 35.2618 9.7 36.7 -114.7 0.0713 1.2 6.5 Cyg X-1
308.2089 40.8109 6.1 32.8 -101.1 -0.1028 -1.9 9.6 Cyg X-3
325.9115 38.3548 0.0 21.3 -83.5 -0.0969 -2.7 12.4 Cyg X-2
335.9986 -3.3706 2.1 23.0 125.9 0.2083 5.4 ------ UNKNOWN
317.3872 -8.7625 0.2 34.5 158.8 2.5092 52.8 ------ UNKNOWN
291.2812 -15.1650 3.1 57.2 178.1 0.8184 3.8 ------ UNKNOWN
289.1272 -12.3933 2.1 57.3 -177.8 1.0875 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
94.756600 302.973400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
285.0209 -25.0044 7.1 34.8 -112.4 0.4187 1.6 5.1 HT1900.1-2455
288.8113 10.9722 1.1 34.6 -46.3 2.1981 10.5 1.8 GRS 1915+105
299.5849 35.2084 0.5 47.1 -10.5 6.7223 23.6 0.5 Cyg X-1
308.0889 40.9687 3.2 50.5 0.4 1.3054 3.6 1.4 Cyg X-3
326.1954 38.3508 22.7 47.8 18.8 0.2055 0.5 2.1 Cyg X-2
336.2902 34.1671 2.7 46.5 31.2 1.7465 4.3 ------ UNKNOWN
308.4031 25.2698 3.5 35.1 -4.7 0.6036 3.3 ------ UNKNOWN
301.1025 35.2884 2.2 46.6 -8.9 1.3735 5.2 ------ UNKNOWN
302.7724 -31.4891 2.7 26.5 -141.8 0.6633 4.3 ------ UNKNOWN
291.5370 -20.2617 2.6 27.4 -108.2 0.8122 4.5 ------ UNKNOWN
278.0801 -49.1705 2.8 52.0 -138.9 3.2274 4.1 ------ UNKNOWN
Plot creation:
Sun May 31 15:32:27 EDT 2015