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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.2600 13.8247 0.0068 32.6131 -5.2418 3.2025242 28.411 TRIG_00302888
Foreground time interval of the image:
-14.264 46.024 (delta_t = 60.288 [sec])
Background time interval of the image:
-365.799 -267.890 (delta_t = 97.909 [sec])
-239.000 -14.264 (delta_t = 224.736 [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 80.000000
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 80.000000
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 80.000000
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 -14.264 sec. to 46.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71641 ( -0.107387 0.108812 )
Norm@50keV : 3.23203E-03 ( -0.000194764 0.000193033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.02 using 59 PHA bins.
# Reduced chi-squared = 0.9301 for 57 degrees of freedom
# Null hypothesis probability = 6.252694e-01
Photon flux (15-150 keV) in 60.29 sec: 0.431740 ( -0.0243852 0.0244399 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80194e-06 ( -1.13944e-07 1.14938e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.264 sec. to 46.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.10635 ( )
Epeak [keV] : 42.9771 ( )
Norm@50keV : 2.03008E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.48 using 59 PHA bins.
# Reduced chi-squared = 0.9371 for 56 degrees of freedom
# Null hypothesis probability = 6.089126e-01
Photon flux (15-150 keV) in 60.29 sec: 0.431671 ( -0.024412 0.024264 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79932e-06 ( -1.1235e-07 1.14557e-07 ) ergs/cm2
Band function
Time interval is from -14.264 sec. to 46.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26996 ( 1.2804 6.0667 )
beta : -1.75616 ( -0.188896 0.140984 )
Epeak [keV] : 51.4709 ( -52.1789 -52.1789 )
Norm@50keV : 6.34721E-03 ( -0.00303257 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.78 using 59 PHA bins.
# Reduced chi-squared = 0.9597 for 55 degrees of freedom
# Null hypothesis probability = 5.598773e-01
Photon flux (15-150 keV) in 60.29 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] : 12.1187 ( )
R^2/D10^2 : 9.57427E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 149.66 using 59 PHA bins.
# Reduced chi-squared = 2.6256 for 57 degrees of freedom
# Null hypothesis probability = 2.980553e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.794e-07 1.987e-08
25- 50 5.713e-07 3.708e-08
50-150 5.078e-07 7.102e-08
15-150 1.258e-06 8.320e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 136.777 ( )
Norm : 1.77081 (-0.117361 0.154365)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.67 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.138571e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.737e-07 2.351e-08
25- 50 5.017e-07 4.850e-08
50-150 9.600e-07 3.055e-07
15-150 1.735e-06 3.515e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.21692 (-0.948565 1.00568)
R1^2/D10^2 : 0.503479 (-0.183265 0.326912)
kT2 [keV] : 33.4716 (-7.7936 15.4424)
R2^2/D10^2 : 2.06858E-03 (-0.00135843 0.00286806)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.72 using 59 PHA bins.
# Reduced chi-squared = 0.9404 for 55 degrees of freedom
# Null hypothesis probability = 6.007320e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.823e-07 4.272e-08
25- 50 5.114e-07 7.126e-08
50-150 1.057e-06 5.040e-07
15-150 1.851e-06 4.320e-07
Peak spectrum fit
Power-law model
Time interval is from 4.504 sec. to 5.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27455 ( -0.208018 0.207388 )
Norm@50keV : 1.33552E-02 ( -0.00153988 0.00153544 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.41 using 59 PHA bins.
# Reduced chi-squared = 0.8844 for 57 degrees of freedom
# Null hypothesis probability = 7.188926e-01
Photon flux (15-150 keV) in 1 sec: 1.58609 ( -0.185517 0.185874 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32813e-07 ( -1.72992e-08 1.7475e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.504 sec. to 5.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27074 ( -0.811472 2.12279 )
Epeak [keV] : 9996.73 ( )
Norm@50keV : 1.34136E-02 ( -0.0134136 0.01771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.41 using 59 PHA bins.
# Reduced chi-squared = 0.9002 for 56 degrees of freedom
# Null hypothesis probability = 6.855168e-01
Photon flux (15-150 keV) in 1 sec: 1.58575 ( -0.18564 0.18554 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3282e-07 ( -1.8244e-08 1.7401e-08 ) ergs/cm2
Band function
Time interval is from 4.504 sec. to 5.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01387 ( 1.01521 1.01521 )
beta : -1.27452 ( 1.27453 0.208241 )
Epeak [keV] : 47.8153 ( -46.7168 -46.7168 )
Norm@50keV : 2.48045E-02 ( -0.0130143 1.99922 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.41 using 59 PHA bins.
# Reduced chi-squared = 0.9166 for 55 degrees of freedom
# Null hypothesis probability = 6.503617e-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] : 18.7053 (-2.85797 3.48382)
R^2/D10^2 : 8.81074E-02 (-0.0376954 0.0644898)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.54 using 59 PHA bins.
# Reduced chi-squared = 1.220 for 57 degrees of freedom
# Null hypothesis probability = 1.231985e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.093e-09 1.360e-09
25- 50 2.898e-08 5.895e-09
50-150 7.429e-08 1.703e-08
15-150 1.094e-07 2.018e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.52220 (-0.757024 0.756958)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.89 using 59 PHA bins.
# Reduced chi-squared = 0.9805 for 57 degrees of freedom
# Null hypothesis probability = 5.167943e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.624e-08 9.005e-09
25- 50 3.124e-08 1.721e-08
50-150 6.852e-08 3.789e-08
15-150 1.160e-07 6.360e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.70527 (-2.23137 3.10825)
R1^2/D10^2 : 2.90142 (-2.26151 21.4438)
kT2 [keV] : 27.0435 (-6.12561 13.4217)
R2^2/D10^2 : 2.33417E-02 (-0.0169425 0.01834)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.15 using 59 PHA bins.
# Reduced chi-squared = 0.9119 for 55 degrees of freedom
# Null hypothesis probability = 6.599707e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.447e-08 7.793e-09
25- 50 2.711e-08 1.061e-08
50-150 9.017e-08 4.025e-08
15-150 1.318e-07 5.422e-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: 1.71641 ( -0.107387 0.108812 )
Norm@50keV : 3.23203E-03 ( -0.000194764 0.000193033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.02 using 59 PHA bins.
# Reduced chi-squared = 0.9301 for 57 degrees of freedom
# Null hypothesis probability = 6.252694e-01
Photon flux (15-150 keV) in 60.29 sec: 0.431740 ( -0.0243852 0.0244399 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80194e-06 ( -1.13944e-07 1.14938e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.10635 ( )
Epeak [keV] : 42.9771 ( )
Norm@50keV : 2.03008E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.48 using 59 PHA bins.
# Reduced chi-squared = 0.9371 for 56 degrees of freedom
# Null hypothesis probability = 6.089126e-01
Photon flux (15-150 keV) in 60.29 sec: 0.431671 ( -0.024412 0.024264 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79932e-06 ( -1.1235e-07 1.14557e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26996 ( 1.2804 6.02619 )
beta : -1.75616 ( -0.188896 0.140984 )
Epeak [keV] : 51.4709 ( -52.1789 -52.1789 )
Norm@50keV : 6.34721E-03 ( -0.00303257 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.78 using 59 PHA bins.
# Reduced chi-squared = 0.9597 for 55 degrees of freedom
# Null hypothesis probability = 5.598773e-01
Photon flux (15-150 keV) in 60.29 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) = 4.91e-07
S(50-100 keV) = 5.98e-07
T90 vs. Hardness ratio plot
T90 = 42.2639999985695 sec.
Hardness ratio (energy fluence ratio) = 1.21792
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.25084
Count Ratio (50-100 keV) / (15-25 keV) = 0.772949
Mask shadow pattern
IMX = 6.371740446585199E-01, IMY = 5.845579753707202E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000
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:
-365.799400 -267.890000
-239.000000 -14.264000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2862 35.3895 8.4 10.9 -0.3 0.3328 1.4 8.8 Her X-1
268.4204 -1.3706 5.7 48.1 -31.7 1.1746 2.0 5.8 SW J1753.5-0127
288.8578 10.9470 8.4 43.5 -64.5 1.7392 1.4 3.5 GRS 1915+105
299.5873 35.1938 0.7 32.7 -103.9 7.6596 17.6 0.5 Cyg X-1
308.0461 40.9443 2.2 35.8 -118.5 2.3876 5.4 2.9 Cyg X-3
274.6472 -4.5640 2.7 52.5 -38.8 4.9999 4.3 ------ UNKNOWN
333.8677 44.5533 4.1 51.1 -135.7 3.3928 2.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-14.264000 46.024000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3164 35.4782 6.7 10.8 -0.3 0.1528 1.7 10.7 Her X-1
268.2839 -1.4414 6.5 48.1 -31.5 -0.4166 -1.8 5.1 SW J1753.5-0127
288.9531 11.0025 10.5 43.5 -64.6 -0.4255 -1.1 9.7 GRS 1915+105
299.6166 35.1802 8.4 32.7 -103.9 -0.2403 -1.4 1.8 Cyg X-1
308.0040 40.8370 6.0 35.8 -118.3 -0.3192 -1.9 8.4 Cyg X-3
212.3093 61.7270 2.5 30.6 119.7 0.7222 4.6 ------ UNKNOWN
59.0384 78.4053 2.3 55.2 166.5 2.5357 5.1 ------ UNKNOWN
251.2601 13.8247 0.4 32.6 -5.2 3.2028 28.4 ------ UNKNOWN
279.3414 29.7284 2.2 23.0 -70.8 0.5804 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
141.300600 457.800630
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9726 -15.6331 0.2 30.1 -6.5 17.1614 55.7 0.6 Sco X-1
254.3279 35.4575 20.1 21.8 168.1 0.1652 0.6 9.4 Her X-1
256.0233 -37.8146 4.4 51.8 -23.5 1.9204 2.6 2.5 4U 1700-377
256.6072 -36.3920 23.2 50.5 -24.3 -0.3265 -0.5 8.5 GX 349+2
262.9454 -24.8763 16.0 40.3 -35.2 -0.3305 -0.7 8.6 GX 1+4
268.3083 -1.5801 7.3 22.9 -67.6 0.5238 1.6 8.4 SW J1753.5-0127
270.2677 -25.1333 13.5 43.1 -44.2 0.5014 0.9 3.4 GX 5-1
270.2758 -25.8727 5.4 43.8 -43.7 -1.3523 -2.1 7.9 GRS 1758-258
273.9091 -13.9391 3.8 35.7 -58.5 -1.4584 -3.1 8.1 GX 17+2
288.6307 10.9366 6.5 36.6 -108.5 1.1461 1.8 9.9 GRS 1915+105
299.5960 35.1828 1.2 48.3 -143.8 7.3144 10.0 1.2 Cyg X-1
308.0129 40.8094 13.0 56.0 -148.9 1.4878 0.9 9.7 Cyg X-3
263.0379 -33.7207 5.3 48.8 -31.7 1.4294 2.2 7.3 GX 354-0
219.5242 -12.5133 3.0 41.0 32.8 2.2837 3.9 ------ UNKNOWN
227.3301 -8.2745 2.7 32.4 29.8 1.5153 4.3 ------ UNKNOWN
249.7029 -36.4435 2.6 50.3 -17.0 2.8227 4.5 ------ UNKNOWN
244.5319 -44.2417 3.2 58.4 -13.0 6.1972 3.5 ------ UNKNOWN
267.3143 -26.6511 2.0 43.4 -39.8 2.8520 5.7 ------ UNKNOWN
Plot creation:
Sun May 31 08:22:36 EDT 2015