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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
263.5351 49.2338 0.0128 28.3004 42.3244 2.5324549 15.000 TRIG_00424716
Foreground time interval of the image:
-9.000 72.301 (delta_t = 81.301 [sec])
Background time interval of the image:
-239.000 -9.000 (delta_t = 230.000 [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 64.000000
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 64.000000
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 64.000000
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)
The mask-weighted light curves based on cleaned DPHs
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 -9.000 sec. to 282.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86435 ( -0.144799 0.149114 )
Norm@50keV : 9.89712E-04 ( -9.01459e-05 8.86015e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.96 using 59 PHA bins.
# Reduced chi-squared = 1.262 for 57 degrees of freedom
# Null hypothesis probability = 8.759340e-02
Photon flux (15-150 keV) in 291 sec: 0.139933 ( -0.0103011 0.0103062 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64777e-06 ( -2.38229e-07 2.42821e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.000 sec. to 282.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74588 ( -0.572418 0.515988 )
Epeak [keV] : 92.1669 ( -82.1265 -92.2075 )
Norm@50keV : 1.15434E-03 ( -0.000601816 0.00124441 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.81 using 59 PHA bins.
# Reduced chi-squared = 1.282 for 56 degrees of freedom
# Null hypothesis probability = 7.573731e-02
Photon flux (15-150 keV) in 291 sec: 0.138995 ( -0.01102 0.010908 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60861e-06 ( -2.91678e-07 2.73831e-07 ) ergs/cm2
Band function
Time interval is from -9.000 sec. to 282.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.74519 ( 1.74529 0.534805 )
beta : -9.37094 ( 9.37164 19.3716 )
Epeak [keV] : 92.3202 ( -52.4722 -92.2236 )
Norm@50keV : 1.15455E-03 ( -0.000251055 0.00056885 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.81 using 59 PHA bins.
# Reduced chi-squared = 1.306 for 55 degrees of freedom
# Null hypothesis probability = 6.355058e-02
Photon flux (15-150 keV) in 291 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] : 10.4712 ( )
R^2/D10^2 : 5.28453E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 117.74 using 59 PHA bins.
# Reduced chi-squared = 2.0655 for 57 degrees of freedom
# Null hypothesis probability = 4.070160e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.483e-07 4.826e-08
25- 50 9.228e-07 8.279e-08
50-150 5.495e-07 1.167e-07
15-150 1.821e-06 1.727e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 86.5256 (-21.5686 35.0924)
Norm : 0.634666 (-0.0695578 0.0833549)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.51 using 59 PHA bins.
# Reduced chi-squared = 1.290 for 57 degrees of freedom
# Null hypothesis probability = 6.954651e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.812e-07 5.936e-08
25- 50 8.068e-07 6.417e-08
50-150 1.199e-06 4.404e-07
15-150 2.487e-06 4.522e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.76285 (-1.1983 1.29636)
R1^2/D10^2 : 0.365221 (-0.187577 0.524806)
kT2 [keV] : 21.8262 (-4.97318 8.78307)
R2^2/D10^2 : 2.63576E-03 (-0.00183428 0.00277481)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.18 using 59 PHA bins.
# Reduced chi-squared = 1.312 for 55 degrees of freedom
# Null hypothesis probability = 5.993883e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.094e-07 1.273e-07
25- 50 7.600e-07 1.745e-07
50-150 1.302e-06 6.083e-07
15-150 2.572e-06 8.410e-07
Peak spectrum fit
Power-law model
Time interval is from 31.000 sec. to 32.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11829 ( -0.567681 0.560254 )
Norm@50keV : 5.84340E-03 ( -0.00168111 0.00167805 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.13 using 59 PHA bins.
# Reduced chi-squared = 1.283 for 57 degrees of freedom
# Null hypothesis probability = 7.366768e-02
Photon flux (15-150 keV) in 1 sec: 0.679057 ( -0.200267 0.20154 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.07444e-08 ( -1.95264e-08 1.98549e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 31.000 sec. to 32.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.90309 ( )
Epeak [keV] : 261.341 ( )
Norm@50keV : 6.83468E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.63 using 59 PHA bins.
# Reduced chi-squared = 1.297 for 56 degrees of freedom
# Null hypothesis probability = 6.683841e-02
Photon flux (15-150 keV) in 1 sec: 0.671206 ( -0.247651 0.207689 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.06048e-08 ( -1.95421e-08 1.98608e-08 ) ergs/cm2
Band function
Time interval is from 31.000 sec. to 32.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.94364 ( 3.28998 2.94364 )
beta : -1.11832 ( -0.559984 0.56764 )
Epeak [keV] : 208.523 ( -208.523 -208.523 )
Norm@50keV : 0.794201 ( -0.228533 0.228081 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.13 using 59 PHA bins.
# Reduced chi-squared = 1.330 for 55 degrees of freedom
# Null hypothesis probability = 5.149921e-02
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] : 25.0196 (-7.21989 12.4731)
R^2/D10^2 : 1.61441E-02 (-0.0161437 0.0305)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.11 using 59 PHA bins.
# Reduced chi-squared = 1.300 for 57 degrees of freedom
# Null hypothesis probability = 6.340346e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.755e-09 1.090e-09
25- 50 9.960e-09 5.900e-09
50-150 4.622e-08 2.936e-08
15-150 5.794e-08 3.553e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-100.715 -199.363)
Norm : 2.77655 (-0.823303 0.823333)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.22 using 59 PHA bins.
# Reduced chi-squared = 1.320 for 57 degrees of freedom
# Null hypothesis probability = 5.336339e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.914e-09 4.255e-09
25- 50 1.330e-08 8.120e-09
50-150 2.917e-08 1.757e-08
15-150 4.938e-08 3.053e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.00247 (-1.89388 2.806)
R1^2/D10^2 : 29.7977 (-28.7963 118404)
kT2 [keV] : 28.4010 (-8.49496 17.4336)
R2^2/D10^2 : 1.04005E-02 (-0.00769343 0.0190593)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.25 using 59 PHA bins.
# Reduced chi-squared = 1.241 for 55 degrees of freedom
# Null hypothesis probability = 1.081832e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.956e-09 3.867e-09
25- 50 8.994e-09 5.005e-09
50-150 4.749e-08 3.016e-08
15-150 6.344e-08 3.739e-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: 1.93171 ( -0.160923 0.16772 )
Norm@50keV : 1.97982E-03 ( -0.000210191 0.000206115 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.28 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.368908e-01
Photon flux (15-150 keV) in 81.3 sec: 0.288027 ( -0.0236805 0.0236845 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48054e-06 ( -1.50448e-07 1.53858e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59100 ( -0.660729 0.562757 )
Epeak [keV] : 50.7945 ( )
Norm@50keV : 3.09524E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.27 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 56 degrees of freedom
# Null hypothesis probability = 2.351619e-01
Photon flux (15-150 keV) in 81.3 sec: 0.283095 ( -0.024976 0.025 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42212e-06 ( -1.74982e-07 1.4021e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59094 ( 1.69248 0.775252 )
beta : -10.0000 ( 10 5.32907e-15 )
Epeak [keV] : 50.7811 ( -26.1655 -50.7811 )
Norm@50keV : 3.09492E-03 ( -0.00127809 0.00421606 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.27 using 59 PHA bins.
# Reduced chi-squared = 1.150 for 55 degrees of freedom
# Null hypothesis probability = 2.074647e-01
Photon flux (15-150 keV) in 81.3 sec: 0.283023 ( 6.71698 -0.024329 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41777e-06 ( -1.41721e-06 -1.71478e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 7.63e-07
S(50-100 keV) = 8.38e-07
T90 vs. Hardness ratio plot
T90 = 225 sec.
Hardness ratio (energy fluence ratio) = 1.0983
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.04085
Count Ratio (50-100 keV) / (15-25 keV) = 0.622414
Mask shadow pattern
IMX = 3.981021646531636E-01, IMY = -3.625552295218453E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
-239.000000 -9.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4968 35.3806 4.7 32.9 71.4 1.0539 2.5 3.0 Her X-1
246.3630 30.8667 2.5 32.9 86.4 2.1211 4.6 ------ UNKNOWN
274.0708 39.9083 2.0 40.0 46.8 3.3149 5.8 ------ UNKNOWN
315.6059 52.0503 2.2 52.3 7.0 3.9531 5.3 ------ UNKNOWN
268.5111 70.9616 2.3 25.5 -6.9 1.1525 5.0 ------ UNKNOWN
313.0562 71.6150 2.3 39.0 -13.3 1.4925 5.1 ------ UNKNOWN
164.7364 66.3311 3.2 25.7 -90.3 1.0211 3.6 ------ UNKNOWN
130.4567 62.4227 2.7 40.8 -88.2 5.3469 4.3 ------ UNKNOWN
147.8037 41.9396 3.1 45.3 -121.4 3.5559 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-9.000000 72.300580
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3922 35.4038 6.4 32.9 71.5 -0.4392 -1.8 4.9 Her X-1
263.5351 49.2338 0.8 28.3 42.3 2.5324 15.0 ------ UNKNOWN
173.8153 25.8205 2.0 43.7 -159.9 1.1663 5.7 ------ UNKNOWN
173.4008 45.9701 2.0 28.8 -136.5 0.8076 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
121.900600 963.060000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4554 35.3244 2.2 15.4 118.8 3.5792 5.3 1.1 Her X-1
288.7836 10.9684 2.8 43.6 52.4 10.8291 4.0 1.6 GRS 1915+105
299.5857 35.2016 0.3 29.8 14.3 31.1705 40.9 0.2 Cyg X-1
308.1586 40.9584 1.8 32.1 -2.5 4.9740 6.5 2.2 Cyg X-3
326.1073 38.2519 12.3 45.2 -10.8 -1.0164 -0.9 5.2 Cyg X-2
309.0111 14.1497 2.0 51.0 27.0 16.8965 5.9 ------ UNKNOWN
200.6114 24.6861 3.7 54.1 176.9 8.2131 3.1 ------ UNKNOWN
327.2632 25.9912 2.7 53.7 0.9 9.1386 4.3 ------ UNKNOWN
273.2819 57.4656 3.3 10.1 -58.8 2.1221 3.5 ------ UNKNOWN
190.1009 29.9756 2.7 57.3 -170.7 14.6695 4.3 ------ UNKNOWN
249.4954 74.6081 3.8 26.1 -98.6 2.6640 3.0 ------ UNKNOWN
Plot creation:
Sun May 31 01:20:23 EDT 2015