Click here for the BAT GCN circular template
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.0420 -59.9590 0.0102 35.6576 -32.5120 1.2728908 18.879 TRIG_00287088
Foreground time interval of the image:
-0.844 28.668 (delta_t = 29.512 [sec])
Background time interval of the image:
-239.584 -0.844 (delta_t = 238.740 [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 -0.844 sec. to 28.668 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73242 ( -0.179588 0.183772 )
Norm@50keV : 2.59876E-03 ( -0.000261476 0.000255731 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.65 using 59 PHA bins.
# Reduced chi-squared = 0.9763 for 57 degrees of freedom
# Null hypothesis probability = 5.259207e-01
Photon flux (15-150 keV) in 29.51 sec: 0.349146 ( -0.0318657 0.0319325 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.0842e-07 ( -7.40403e-08 7.48282e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.844 sec. to 28.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73216 ( -0.391546 0.16746 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 2.60224E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.67 using 59 PHA bins.
# Reduced chi-squared = 0.9941 for 56 degrees of freedom
# Null hypothesis probability = 4.873134e-01
Photon flux (15-150 keV) in 29.51 sec: 0.348987 ( -0.031409 0.031903 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.05903e-07 ( -7.18008e-08 6.72887e-08 ) ergs/cm2
Band function
Time interval is from -0.844 sec. to 28.668 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.38259 ( 1.38349 1.38349 )
beta : -1.73235 ( 1.73238 0.179645 )
Epeak [keV] : 21.6664 ( -21.277 -21.277 )
Norm@50keV : 6.02585E-03 ( -0.00369435 0.382129 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.65 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 55 degrees of freedom
# Null hypothesis probability = 4.502181e-01
Photon flux (15-150 keV) in 29.51 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] : 10.8361 ( )
R^2/D10^2 : 0.113031 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 121.20 using 59 PHA bins.
# Reduced chi-squared = 2.1263 for 57 degrees of freedom
# Null hypothesis probability = 1.563350e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.158e-08 1.387e-08
25- 50 2.262e-07 2.744e-08
50-150 1.483e-07 3.678e-08
15-150 4.561e-07 5.902e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 158.778 (-63.7539 -158.014)
Norm : 1.39685 (-0.14179 0.195408)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.38 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 57 degrees of freedom
# Null hypothesis probability = 2.614804e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.053e-07 1.878e-08
25- 50 1.968e-07 6.274e-08
50-150 3.975e-07 2.145e-07
15-150 6.997e-07 2.677e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.35870 (-0.996544 1.12409)
R1^2/D10^2 : 0.726742 (-0.342538 0.719093)
kT2 [keV] : 45.0674 (-13.9935 39.9607)
R2^2/D10^2 : 8.36427E-04 (-0.000632843 0.0015488)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.56 using 59 PHA bins.
# Reduced chi-squared = 0.8465 for 55 degrees of freedom
# Null hypothesis probability = 7.840332e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.306e-07 3.011e-08
25- 50 1.825e-07 4.367e-08
50-150 4.747e-07 2.452e-07
15-150 7.878e-07 2.729e-07
Peak spectrum fit
Power-law model
Time interval is from 3.232 sec. to 4.232 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33732 ( -0.430437 0.419969 )
Norm@50keV : 5.52698E-03 ( -0.00131661 0.00131505 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.00 using 59 PHA bins.
# Reduced chi-squared = 0.7719 for 57 degrees of freedom
# Null hypothesis probability = 8.964000e-01
Photon flux (15-150 keV) in 1 sec: 0.664132 ( -0.163696 0.164375 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.41366e-08 ( -1.40554e-08 1.42151e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.232 sec. to 4.232 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30016 ( )
Epeak [keV] : 936.755 ( )
Norm@50keV : 5.78553E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.02 using 59 PHA bins.
# Reduced chi-squared = 0.7860 for 56 degrees of freedom
# Null hypothesis probability = 8.770931e-01
Photon flux (15-150 keV) in 1 sec: 0.664270 ( -0.163923 0.162854 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.40328e-08 ( -1.44003e-08 1.42237e-08 ) ergs/cm2
Band function
Time interval is from 3.232 sec. to 4.232 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.51884 ( 9.51884 9.51884 )
beta : -1.33731 ( -0.419337 0.430397 )
Epeak [keV] : 109.335 ( -109.335 -109.335 )
Norm@50keV : 0.751195 ( -0.178954 0.178744 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.00 using 59 PHA bins.
# Reduced chi-squared = 0.8000 for 55 degrees of freedom
# Null hypothesis probability = 8.562769e-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] : 16.6740 (-4.57751 7.3606)
R^2/D10^2 : 5.39525E-02 (-0.0383457 0.109309)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.95 using 59 PHA bins.
# Reduced chi-squared = 0.8588 for 57 degrees of freedom
# Null hypothesis probability = 7.671205e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.071e-09 1.796e-09
25- 50 1.338e-08 6.562e-09
50-150 2.638e-08 1.467e-08
15-150 4.283e-08 2.197e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-99.9484 -199.363)
Norm : 2.76261 (-0.663334 0.663355)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.98 using 59 PHA bins.
# Reduced chi-squared = 0.7891 for 57 degrees of freedom
# Null hypothesis probability = 8.755142e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.879e-09 4.075e-09
25- 50 1.323e-08 7.740e-09
50-150 2.902e-08 1.751e-08
15-150 4.913e-08 2.881e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.4099 ( )
R1^2/D10^2 : 0.163767 (-0.117675 29.4662)
kT2 [keV] : 170.999 (-171.847 -171.847)
R2^2/D10^2 : 1.15811E-04 (-7.17437e-05 0.0472468)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.17 using 59 PHA bins.
#Fit statistic : Chi-Squared = 43.97 using 59 PHA bins.
# Reduced chi-squared = 0.8030 for 55 degrees of freedom
# Reduced chi-squared = 0.7994 for 55 degrees of freedom
# Null hypothesis probability = 8.520118e-01
# Null hypothesis probability = 8.570394e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.030e-09 3.049e-09
25- 50 1.391e-08 8.215e-09
50-150 3.584e-08 1.756e-08
15-150 5.478e-08 2.587e-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: 1.73242 ( -0.179588 0.183772 )
Norm@50keV : 2.59876E-03 ( -0.000261476 0.000255731 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.65 using 59 PHA bins.
# Reduced chi-squared = 0.9763 for 57 degrees of freedom
# Null hypothesis probability = 5.259207e-01
Photon flux (15-150 keV) in 29.51 sec: 0.349146 ( -0.0318657 0.0319325 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.0842e-07 ( -7.40403e-08 7.48282e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73216 ( -0.391546 0.16746 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 2.60224E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.67 using 59 PHA bins.
# Reduced chi-squared = 0.9941 for 56 degrees of freedom
# Null hypothesis probability = 4.873134e-01
Photon flux (15-150 keV) in 29.51 sec: 0.348987 ( -0.031409 0.031903 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.05903e-07 ( -7.18008e-08 6.72887e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.38259 ( 1.38349 1.38349 )
beta : -1.73235 ( 1.73238 0.179645 )
Epeak [keV] : 21.6664 ( -21.277 -21.277 )
Norm@50keV : 6.02585E-03 ( -0.00369435 0.382129 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.65 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 55 degrees of freedom
# Null hypothesis probability = 4.502181e-01
Photon flux (15-150 keV) in 29.51 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) = 1.94e-07
S(50-100 keV) = 2.34e-07
T90 vs. Hardness ratio plot
T90 = 26.4320000112057 sec.
Hardness ratio (energy fluence ratio) = 1.20619
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.00603
Count Ratio (50-100 keV) / (15-25 keV) = 0.730404
Mask shadow pattern
IMX = 6.050113605532932E-01, IMY = 3.856135393564443E-01
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:
-239.584000 -0.844000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.9305 -37.9624 50.6 47.0 -1.6 -0.0822 -0.2 7.6 4U 1700-377
256.4966 -36.3399 3.0 48.0 0.2 1.4893 3.9 5.8 GX 349+2
264.7101 -44.2727 18.0 37.9 0.4 -0.1528 -0.6 10.7 4U 1735-44
270.3716 -25.0268 5.2 51.3 21.3 -1.6715 -2.2 5.7 GX 5-1
270.2500 -25.6922 6.0 50.8 20.8 1.3686 1.9 4.2 GRS 1758-258
275.9595 -30.2517 10.0 44.4 23.8 0.4454 1.2 7.1 H1820-303
285.0628 -25.0251 9.4 45.4 37.3 0.7109 1.2 6.4 HT1900.1-2455
263.1322 -33.8071 9.2 47.0 8.2 0.4440 1.3 7.3 GX 354-0
18.6545 -54.3013 2.0 28.9 -170.7 0.9633 5.9 ------ UNKNOWN
40.8503 -30.7925 2.9 57.1 -175.4 3.4953 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.844000 28.668000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.0201 -37.8940 71.5 47.0 -1.5 0.0172 0.2 3.4 4U 1700-377
256.4675 -36.3922 4.0 48.0 0.1 -0.3126 -2.9 2.4 GX 349+2
264.8678 -44.5474 5.9 37.6 0.2 0.1417 2.0 7.9 4U 1735-44
270.3208 -25.0691 5.5 51.3 21.2 0.5530 2.1 2.1 GX 5-1
270.1807 -25.6483 56.3 50.9 20.7 0.0490 0.2 8.7 GRS 1758-258
275.9810 -30.5261 0.0 44.1 23.6 0.1359 1.1 10.0 H1820-303
284.9860 -25.0086 4.1 45.5 37.2 -0.5042 -2.8 5.9 HT1900.1-2455
262.9035 -33.9097 9.6 47.1 7.9 -0.1372 -1.2 6.2 GX 354-0
287.4469 -22.2015 1.8 47.2 41.6 1.5921 6.4 ------ UNKNOWN
245.0420 -59.9590 0.6 35.7 -32.5 1.2729 18.9 ------ UNKNOWN
126.2418 -76.1182 2.2 41.0 -96.3 1.1835 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
199.516600 962.488700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2899 -60.6135 11.6 58.1 -25.1 2.6048 1.0 0.9 Cen X-3
258.4259 -68.0117 2.0 52.7 17.9 9.0193 5.8 ------ UNKNOWN
Plot creation:
Sun May 31 09:29:56 EDT 2015