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
77.1049 69.7250 0.0135 37.8139 -158.2628 0.8451603 14.125 TRIG_00178750
Foreground time interval of the image:
-1.200 13.548 (delta_t = 14.748 [sec])
Background time interval of the image:
-27.899 -1.200 (delta_t = 26.699 [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 -1.200 sec. to 13.548 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81370 ( -0.176925 0.18285 )
Norm@50keV : 3.42799E-03 ( -0.000388214 0.000380674 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.15 using 59 PHA bins.
# Reduced chi-squared = 0.7220 for 57 degrees of freedom
# Null hypothesis probability = 9.435459e-01
Photon flux (15-150 keV) in 14.75 sec: 0.474902 ( -0.0459631 0.0459863 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.65277e-07 ( -5.29647e-08 5.3843e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.200 sec. to 13.548 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73706 ( -0.778234 0.635754 )
Epeak [keV] : 148.016 ( -153.248 -153.261 )
Norm@50keV : 3.78863E-03 ( -0.00200995 0.00660497 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.12 using 59 PHA bins.
# Reduced chi-squared = 0.7343 for 56 degrees of freedom
# Null hypothesis probability = 9.318324e-01
Photon flux (15-150 keV) in 14.75 sec: 0.473361 ( -0.047518 0.047093 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.61535e-07 ( -6.48808e-08 5.69483e-08 ) ergs/cm2
Band function
Time interval is from -1.200 sec. to 13.548 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.49208 ( -4.49208 -4.49208 )
beta : -1.99419 ( -0.256661 0.227282 )
Epeak [keV] : 25.3459 ( -4.55526 3.72663 )
Norm@50keV : 187.635 ( -17.9288 11767.3 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.45 using 59 PHA bins.
# Reduced chi-squared = 0.6991 for 55 degrees of freedom
# Null hypothesis probability = 9.560157e-01
Photon flux (15-150 keV) in 14.75 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] : 10.3429 (-1.21472 1.41771)
R^2/D10^2 : 0.193905 (-0.0745096 0.117465)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.79 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 57 degrees of freedom
# Null hypothesis probability = 1.988288e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.298e-08 1.136e-08
25- 50 1.641e-07 2.066e-08
50-150 9.435e-08 2.444e-08
15-150 3.214e-07 4.432e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 95.3121 (-29.4807 56.9227)
Norm : 2.11471 (-0.283382 0.351305)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.00 using 59 PHA bins.
# Reduced chi-squared = 0.7369 for 57 degrees of freedom
# Null hypothesis probability = 9.314813e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.149e-08 1.165e-08
25- 50 1.395e-07 1.499e-08
50-150 2.199e-07 8.621e-08
15-150 4.410e-07 1.016e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.47686 (-1.40276 1.45752)
R1^2/D10^2 : 0.548871 (-0.254274 0.307425)
kT2 [keV] : 39.1117 (-16.5868 140.737)
R2^2/D10^2 : 1.22378E-03 (-0.00112654 0.00617384)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.20 using 59 PHA bins.
# Reduced chi-squared = 0.6763 for 55 degrees of freedom
# Null hypothesis probability = 9.685555e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.108e-08 2.139e-08
25- 50 1.447e-07 3.930e-08
50-150 2.531e-07 1.358e-07
15-150 4.789e-07 1.682e-07
Peak spectrum fit
Power-law model
Time interval is from 0.184 sec. to 1.184 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57664 ( -0.344453 0.357902 )
Norm@50keV : 6.75070E-03 ( -0.00147938 0.00144931 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.24 using 59 PHA bins.
# Reduced chi-squared = 0.7761 for 57 degrees of freedom
# Null hypothesis probability = 8.915194e-01
Photon flux (15-150 keV) in 1 sec: 0.861337 ( -0.175621 0.175813 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.33198e-08 ( -1.47219e-08 1.51269e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.184 sec. to 1.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.978188 ( -1.02668 0.907951 )
Epeak [keV] : 79.3279 ( )
Norm@50keV : 1.41795E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.62 using 59 PHA bins.
# Reduced chi-squared = 0.7790 for 56 degrees of freedom
# Null hypothesis probability = 8.857956e-01
Photon flux (15-150 keV) in 1 sec: 0.842936 ( -0.180318 0.180174 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.00302e-08 ( -1.63357e-08 1.66981e-08 ) ergs/cm2
Band function
Time interval is from 0.184 sec. to 1.184 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01590 ( -0.784077 1.31635 )
beta : -9.37155 ( 9.37167 19.3717 )
Epeak [keV] : 83.2862 ( -38.583 -83.0671 )
Norm@50keV : 1.34087E-02 ( -0.00701307 0.0104121 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.63 using 59 PHA bins.
# Reduced chi-squared = 0.7933 for 55 degrees of freedom
# Null hypothesis probability = 8.653447e-01
Photon flux (15-150 keV) in 1 sec: 0.843745 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.12214e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.9031 (-3.07791 4.21946)
R^2/D10^2 : 0.165242 (-0.104559 0.273124)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.27 using 59 PHA bins.
# Reduced chi-squared = 0.8468 for 57 degrees of freedom
# Null hypothesis probability = 7.882599e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.835e-09 2.266e-09
25- 50 1.993e-08 8.410e-09
50-150 2.089e-08 1.010e-08
15-150 4.666e-08 1.721e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 170.008 (-98.5401 -169.949)
Norm : 3.55274 (-0.740629 0.970673)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.73 using 59 PHA bins.
# Reduced chi-squared = 0.7672 for 57 degrees of freedom
# Null hypothesis probability = 9.016982e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.016e-09 5.190e-09
25- 50 1.700e-08 9.760e-09
50-150 3.526e-08 2.016e-08
15-150 6.128e-08 3.505e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.42565 (-3.65461 4.70345)
R1^2/D10^2 : 0.812268 ( )
kT2 [keV] : 26.7357 (-22.8323 -26.7849)
R2^2/D10^2 : 8.88801E-03 (-0.0087825 0.0839781)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.00 using 59 PHA bins.
#Fit statistic : Chi-Squared = 42.81 using 59 PHA bins.
# Reduced chi-squared = 0.7818 for 55 degrees of freedom
# Reduced chi-squared = 0.7784 for 55 degrees of freedom
# Null hypothesis probability = 8.800565e-01
# Null hypothesis probability = 8.841606e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.565e-09 5.170e-09
25- 50 1.715e-08 9.165e-09
50-150 3.177e-08 1.883e-08
15-150 5.748e-08 3.225e-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: 1.81370 ( -0.176925 0.18285 )
Norm@50keV : 3.42799E-03 ( -0.000388214 0.000380674 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.15 using 59 PHA bins.
# Reduced chi-squared = 0.7220 for 57 degrees of freedom
# Null hypothesis probability = 9.435459e-01
Photon flux (15-150 keV) in 14.75 sec: 0.474902 ( -0.0459631 0.0459863 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.65277e-07 ( -5.29647e-08 5.3843e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73706 ( -0.778234 0.635754 )
Epeak [keV] : 148.016 ( -153.248 -153.261 )
Norm@50keV : 3.78863E-03 ( -0.00200995 0.00660497 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.12 using 59 PHA bins.
# Reduced chi-squared = 0.7343 for 56 degrees of freedom
# Null hypothesis probability = 9.318324e-01
Photon flux (15-150 keV) in 14.75 sec: 0.473361 ( -0.047518 0.047089 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.61535e-07 ( -6.48808e-08 5.69483e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.49208 ( -4.49208 -4.49208 )
beta : -1.99419 ( -0.256661 0.227282 )
Epeak [keV] : 25.3459 ( -4.55526 3.72663 )
Norm@50keV : 187.635 ( -17.9288 11767.3 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.45 using 59 PHA bins.
# Reduced chi-squared = 0.6991 for 55 degrees of freedom
# Null hypothesis probability = 9.560157e-01
Photon flux (15-150 keV) in 14.75 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) = 1.32e-07
S(50-100 keV) = 1.50e-07
T90 vs. Hardness ratio plot
T90 = 13.4239999949932 sec.
Hardness ratio (energy fluence ratio) = 1.13636
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.27624
Count Ratio (50-100 keV) / (15-25 keV) = 0.654796
Mask shadow pattern
IMX = -7.208831570264456E-01, IMY = 2.874164623184512E-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:
-27.899400 -1.200000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
153.2197 -2.4514 2.2 50.0 30.6 1.1404 5.3 ------ UNKNOWN
125.5825 17.7411 2.0 29.6 74.7 0.4329 5.7 ------ UNKNOWN
97.5377 39.4994 2.1 29.8 143.8 0.3538 5.5 ------ UNKNOWN
126.4748 29.0488 2.5 18.7 82.7 0.2397 4.6 ------ UNKNOWN
151.8331 17.2636 2.2 30.8 23.8 0.3154 5.3 ------ UNKNOWN
205.8990 65.8294 3.0 40.7 -93.1 0.7221 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.200000 13.548000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
138.8304 0.0306 2.1 45.6 49.4 1.0380 5.5 ------ UNKNOWN
71.0440 39.3607 3.3 48.0 158.7 0.4352 3.5 ------ UNKNOWN
150.5175 18.5246 2.6 29.2 25.3 0.2588 4.5 ------ UNKNOWN
77.1049 69.7250 0.8 37.8 -158.3 0.8451 14.1 ------ UNKNOWN
181.3243 64.6652 2.4 30.4 -93.1 0.3429 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
89.300590 302.276800
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6282 22.0211 0.9 47.9 139.3 9.4691 12.6 0.5 Crab
117.8743 37.1133 2.1 39.2 92.0 3.4304 5.4 ------ UNKNOWN
158.2590 49.1733 2.8 41.9 43.0 1.7101 4.1 ------ UNKNOWN
171.6323 67.4856 3.0 31.2 15.2 0.7157 3.9 ------ UNKNOWN
72.4904 54.6961 2.7 15.2 157.6 0.6567 4.3 ------ UNKNOWN
307.2821 61.8627 3.3 43.7 -64.0 2.6007 3.5 ------ UNKNOWN
Plot creation:
Sun May 31 14:24:46 EDT 2015