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
220.9165 -27.8492 0.0170 10.6095 -28.1507 0.3474018 11.332 TRIG_00342121
Foreground time interval of the image:
-2.920 6.624 (delta_t = 9.544 [sec])
Background time interval of the image:
-239.296 -2.920 (delta_t = 236.376 [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 4.096000
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 4.096000
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 4.096000
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 -2.920 sec. to 6.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00539 ( -0.206298 0.218288 )
Norm@50keV : 2.30738E-03 ( -0.000347606 0.000341427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.41 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 57 degrees of freedom
# Null hypothesis probability = 1.432287e-01
Photon flux (15-150 keV) in 9.544 sec: 0.346968 ( -0.0401275 0.0401291 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03136e-07 ( -2.84415e-08 2.92824e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.920 sec. to 6.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.392538 ( -1.48315 1.11738 )
Epeak [keV] : 38.4188 ( -7.62232 9.93531 )
Norm@50keV : 2.16896E-02 ( -0.0216898 0.154543 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.59 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 56 degrees of freedom
# Null hypothesis probability = 2.830215e-01
Photon flux (15-150 keV) in 9.544 sec: 0.329564 ( -0.040995 0.041283 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73588e-07 ( -2.75707e-08 3.24162e-08 ) ergs/cm2
Band function
Time interval is from -2.920 sec. to 6.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.397089 ( -0.998138 1.82468 )
beta : -9.99999 ( 9.99999 20 )
Epeak [keV] : 38.4233 ( -6.58103 10.2549 )
Norm@50keV : 2.15477E-02 ( -0.0215477 0.154947 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.59 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 55 degrees of freedom
# Null hypothesis probability = 2.521842e-01
Photon flux (15-150 keV) in 9.544 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77486e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.57664 (-1.09526 1.24632)
R^2/D10^2 : 0.196841 (-0.0745255 0.118382)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.03 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 57 degrees of freedom
# Null hypothesis probability = 1.930577e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.452e-08 7.144e-09
25- 50 8.064e-08 1.378e-08
50-150 3.708e-08 1.233e-08
15-150 1.522e-07 2.305e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 59.4585 (-16.763 27.8495)
Norm : 1.84477 (-0.32582 0.390133)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.33 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.631161e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.418e-08 6.996e-09
25- 50 6.706e-08 8.876e-09
50-150 7.573e-08 2.758e-08
15-150 1.870e-07 3.584e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.64554 (-2.64554 -4.64895)
R1^2/D10^2 : 1.30010 (-1.10705 69.2036)
kT2 [keV] : 12.0874 (-2.61875 -12.0933)
R2^2/D10^2 : 6.45993E-02 (-0.0643658 0.131253)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.65 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 55 degrees of freedom
# Null hypothesis probability = 2.503952e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.134e-08 2.190e-08
25- 50 7.259e-08 3.794e-08
50-150 5.375e-08 3.226e-08
15-150 1.677e-07 8.580e-08
Peak spectrum fit
Power-law model
Time interval is from 4.080 sec. to 5.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97980 ( -0.436086 0.478599 )
Norm@50keV : 3.22511E-03 ( -0.00105012 0.00102182 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.55 using 59 PHA bins.
# Reduced chi-squared = 0.9219 for 57 degrees of freedom
# Null hypothesis probability = 6.426421e-01
Photon flux (15-150 keV) in 1 sec: 0.479327 ( -0.121119 0.12112 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.97148e-08 ( -8.89447e-09 9.46552e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.080 sec. to 5.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.00527 ( -5.66656 3.14782 )
Epeak [keV] : 32.3553 ( )
Norm@50keV : 0.325059 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.33 using 59 PHA bins.
# Reduced chi-squared = 0.8988 for 56 degrees of freedom
# Null hypothesis probability = 6.882595e-01
Photon flux (15-150 keV) in 1 sec: 0.442273 ( -0.114448 0.1184 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10853e-08 ( -6.0779e-09 1.25492e-08 ) ergs/cm2
Band function
Time interval is from 4.080 sec. to 5.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5.95219 -5 )
beta : -2.52114 ( -2.02031 0.665093 )
Epeak [keV] : 24.7411 ( -5.90291 6.52825 )
Norm@50keV : 651.642 ( -156.478 3141.14 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.03 using 59 PHA bins.
# Reduced chi-squared = 0.8733 for 55 degrees of freedom
# Null hypothesis probability = 7.357903e-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] : 8.20700 (-1.74294 2.31286)
R^2/D10^2 : 0.505706 (-0.319724 0.801003)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.36 using 59 PHA bins.
# Reduced chi-squared = 0.8836 for 57 degrees of freedom
# Null hypothesis probability = 7.205042e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.273e-09 3.281e-09
25- 50 1.147e-08 6.495e-09
50-150 3.274e-09 2.365e-09
15-150 2.102e-08 1.062e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 55.4047 (-27.5519 102.059)
Norm : 2.64205 (-0.942694 1.55597)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.54 using 59 PHA bins.
# Reduced chi-squared = 0.9042 for 57 degrees of freedom
# Null hypothesis probability = 6.793783e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.547e-09 2.614e-09
25- 50 9.715e-09 4.916e-09
50-150 1.033e-08 7.465e-09
15-150 2.659e-08 1.515e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.43773 (-7.43682 2.29753)
R1^2/D10^2 : 0.688953 (-0.689224 1.5144)
kT2 [keV] : 55.4873 (-55.3737 -55.3737)
R2^2/D10^2 : 3.40793E-04 (-0.000342441 0.00783196)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.15 using 59 PHA bins.
# Reduced chi-squared = 0.8755 for 55 degrees of freedom
# Null hypothesis probability = 7.316460e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.598e-09 3.858e-09
25- 50 1.075e-08 6.490e-09
50-150 1.254e-08 6.165e-09
15-150 2.989e-08 1.422e-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: 2.00539 ( -0.206298 0.218288 )
Norm@50keV : 2.30738E-03 ( -0.000347606 0.000341427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.41 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 57 degrees of freedom
# Null hypothesis probability = 1.432287e-01
Photon flux (15-150 keV) in 9.544 sec: 0.346968 ( -0.0401275 0.0401291 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03136e-07 ( -2.84415e-08 2.92824e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.392538 ( -1.48315 1.11738 )
Epeak [keV] : 38.4188 ( -7.62232 9.93525 )
Norm@50keV : 2.16896E-02 ( -0.0216898 0.154543 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.59 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 56 degrees of freedom
# Null hypothesis probability = 2.830215e-01
Photon flux (15-150 keV) in 9.544 sec: 0.329564 ( -0.040995 0.041283 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73588e-07 ( -2.75707e-08 3.24162e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.397089 ( -0.998138 1.82468 )
beta : -9.99999 ( 9.99999 20 )
Epeak [keV] : 38.4233 ( -6.58103 10.2549 )
Norm@50keV : 2.15477E-02 ( -0.0215477 0.154947 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.59 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 55 degrees of freedom
# Null hypothesis probability = 2.521842e-01
Photon flux (15-150 keV) in 9.544 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77486e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 6.12e-08
S(50-100 keV) = 6.10e-08
T90 vs. Hardness ratio plot
T90 = 8.8120000064373 sec.
Hardness ratio (energy fluence ratio) = 0.996732
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.03926
Count Ratio (50-100 keV) / (15-25 keV) = 0.378532
Mask shadow pattern
IMX = 1.651591959193517E-01, IMY = 8.837470254186201E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.296000 -2.920000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2797 -60.5372 6.6 56.1 0.6 1.7050 1.7 5.3 Cen X-3
186.8535 -62.8233 5.2 51.2 -7.5 1.0728 2.2 6.3 GX 301-2
244.9670 -15.6373 0.3 23.4 -116.9 9.1958 41.4 0.7 Sco X-1
255.9805 -37.7941 1.8 37.2 -75.8 3.0398 6.4 3.0 4U 1700-377
256.4624 -36.3036 14.1 37.0 -78.3 0.3825 0.8 7.3 GX 349+2
263.1632 -24.8185 36.9 40.3 -98.2 0.2970 0.3 9.5 GX 1+4
196.4051 -26.3488 3.0 24.2 37.2 0.7688 3.8 ------ UNKNOWN
167.5647 -59.6132 3.0 56.9 2.3 3.8744 3.8 ------ UNKNOWN
221.7988 -22.4933 2.1 5.4 -38.7 0.9725 5.6 ------ UNKNOWN
250.4023 10.6094 3.0 40.6 -157.8 1.0367 3.9 ------ UNKNOWN
254.7683 -29.6631 2.5 33.6 -88.5 1.6575 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.920000 6.624000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3808 -60.6216 4.1 56.1 0.5 -0.4436 -2.8 1.9 Cen X-3
186.7226 -62.6324 26.4 51.1 -7.3 -0.0343 -0.4 8.5 GX 301-2
244.9716 -15.4864 7.0 23.5 -117.3 -0.0629 -1.6 9.2 Sco X-1
256.0712 -37.8905 3.6 37.3 -75.7 -0.2475 -3.2 4.9 4U 1700-377
256.6043 -36.4096 2.9 37.1 -78.2 -0.2995 -3.9 8.2 GX 349+2
262.8754 -24.8359 4.9 40.0 -98.2 0.2826 2.3 9.1 GX 1+4
199.2786 4.0488 2.2 29.9 106.9 0.2609 5.2 ------ UNKNOWN
220.9165 -27.8492 1.0 10.6 -28.2 0.3475 11.3 ------ UNKNOWN
254.3822 5.9580 2.5 40.7 -148.4 0.2306 4.7 ------ UNKNOWN
227.8518 -65.6710 2.8 48.7 -30.5 0.3070 4.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
71.404590 962.775200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.1857 -60.8082 5.6 47.1 13.3 -2.9303 -2.1 11.8 Cen X-3
186.7585 -62.7192 7.6 41.3 5.2 1.5554 1.5 4.2 GX 301-2
244.9709 -15.6459 0.2 25.4 -131.5 40.3182 62.5 0.6 Sco X-1
255.9982 -37.8216 0.8 30.9 -79.9 12.8250 14.2 1.5 4U 1700-377
256.3423 -36.4486 2.7 31.0 -82.6 4.0202 4.3 4.7 GX 349+2
263.1342 -24.6335 51.6 37.8 -102.7 0.3767 0.2 9.6 GX 1+4
264.6194 -44.4804 6.3 38.4 -70.2 2.6731 1.9 5.6 4U 1735-44
262.9114 -33.9073 5.3 36.3 -87.5 3.5469 2.2 5.8 GX 354-0
194.9534 -33.8193 3.4 23.0 50.8 2.3720 3.4 ------ UNKNOWN
225.7527 26.7976 3.9 54.9 167.6 12.0272 3.0 ------ UNKNOWN
Plot creation:
Sun May 31 04:52:17 EDT 2015