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
262.1300 4.0091 0.0027 29.5847 63.8919 17.4523451 69.981 TRIG_00313299
Foreground time interval of the image:
-5.532 11.197 (delta_t = 16.729 [sec])
Background time interval of the image:
-219.803 -5.532 (delta_t = 214.271 [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 -5.532 sec. to 22.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32397 ( -0.0297382 0.0296608 )
Norm@50keV : 4.90480E-02 ( -0.000782837 0.000782077 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.90 using 59 PHA bins.
# Reduced chi-squared = 0.6649 for 57 degrees of freedom
# Null hypothesis probability = 9.758903e-01
Photon flux (15-150 keV) in 28.11 sec: 5.87817 ( -0.107208 0.107525 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35465e-05 ( -2.13218e-07 2.13281e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.532 sec. to 22.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14604 ( -0.121858 0.118705 )
Epeak [keV] : 290.670 ( -92.5853 421.182 )
Norm@50keV : 5.81274E-02 ( -0.00609048 0.00696947 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.32 using 59 PHA bins.
# Reduced chi-squared = 0.5592 for 56 degrees of freedom
# Null hypothesis probability = 9.969155e-01
Photon flux (15-150 keV) in 28.11 sec: 5.79265 ( -0.11943 0.12007 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34394e-05 ( -2.27185e-07 2.2651e-07 ) ergs/cm2
Band function
Time interval is from -5.532 sec. to 22.576 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.321657 ( -0.622011 3.73718 )
beta : -1.37923 ( -0.0493393 0.0466874 )
Epeak [keV] : 61.9779 ( -30.4366 63.1859 )
Norm@50keV : 0.187886 ( -0.112494 35.0233 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 25.95 using 59 PHA bins.
# Reduced chi-squared = 0.4718 for 55 degrees of freedom
# Null hypothesis probability = 9.997039e-01
Photon flux (15-150 keV) in 28.11 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] : 20.2590 ( )
R^2/D10^2 : 0.242103 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 772.10 using 59 PHA bins.
# Reduced chi-squared = 13.546 for 57 degrees of freedom
# Null hypothesis probability = 5.586625e-126
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.357e-07 1.841e-08
25- 50 2.691e-06 6.254e-08
50-150 8.202e-06 1.968e-07
15-150 1.143e-05 1.911e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 25.3549 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 274.75 using 59 PHA bins.
# Reduced chi-squared = 4.8201 for 57 degrees of freedom
# Null hypothesis probability = 2.946750e-30
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.775e-06 3.120e-08
25- 50 3.414e-06 6.325e-08
50-150 7.487e-06 1.377e-07
15-150 1.268e-05 2.193e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.69030 (-0.536087 0.56263)
R1^2/D10^2 : 2.55562 (-0.465552 0.598008)
kT2 [keV] : 33.5727 (-2.0355 2.45302)
R2^2/D10^2 : 3.69765E-02 (-0.00779913 0.00886596)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 24.98 using 59 PHA bins.
# Reduced chi-squared = 0.4541 for 55 degrees of freedom
# Null hypothesis probability = 9.998363e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.207e-06 7.632e-08
25- 50 3.182e-06 9.276e-08
50-150 9.015e-06 2.881e-07
15-150 1.340e-05 3.584e-07
Peak spectrum fit
Power-law model
Time interval is from 7.572 sec. to 8.572 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.937964 ( -0.0492884 0.0490162 )
Norm@50keV : 0.173330 ( -0.00485224 0.0048458 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.37 using 59 PHA bins.
# Reduced chi-squared = 0.7434 for 57 degrees of freedom
# Null hypothesis probability = 9.257152e-01
Photon flux (15-150 keV) in 1 sec: 19.9071 ( -0.562539 0.563046 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.91723e-06 ( -5.74613e-08 5.75418e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.572 sec. to 8.572 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.714137 ( -0.198396 0.179326 )
Epeak [keV] : 344.136 ( -132.467 2199.38 )
Norm@50keV : 0.216077 ( -0.0333369 0.045077 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.29 using 59 PHA bins.
# Reduced chi-squared = 0.6838 for 56 degrees of freedom
# Null hypothesis probability = 9.661218e-01
Photon flux (15-150 keV) in 1 sec: 19.7274 ( -0.5807 0.5812 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90293e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 7.572 sec. to 8.572 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99996 ( -1.30699e-05 -4.99996 )
beta : -0.976219 ( -0.0533926 0.0532348 )
Epeak [keV] : 28.5594 ( -5.96968 3.37697 )
Norm@50keV : 5071.08 ( -138.418 14709.8 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.11 using 59 PHA bins.
# Reduced chi-squared = 0.6929 for 55 degrees of freedom
# Null hypothesis probability = 9.597555e-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] : 23.5054 ( )
R^2/D10^2 : 0.591209 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 234.27 using 59 PHA bins.
# Reduced chi-squared = 4.1100 for 57 degrees of freedom
# Null hypothesis probability = 2.364655e-23
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.857e-08 3.450e-09
25- 50 3.216e-07 1.370e-08
50-150 1.326e-06 5.500e-08
15-150 1.706e-06 5.550e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 80.2168 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 455.76 using 59 PHA bins.
# Reduced chi-squared = 7.9957 for 57 degrees of freedom
# Null hypothesis probability = 1.470179e-63
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.997e-07 5.600e-09
25- 50 3.842e-07 1.110e-08
50-150 8.427e-07 2.445e-08
15-150 1.427e-06 4.200e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.56350 (-1.15866 1.28137)
R1^2/D10^2 : 5.02886 (-1.45631 2.26752)
kT2 [keV] : 39.6221 (-4.48832 6.6466)
R2^2/D10^2 : 0.103160 (-0.0380182 0.0467967)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.15 using 59 PHA bins.
# Reduced chi-squared = 0.6209 for 55 degrees of freedom
# Null hypothesis probability = 9.877631e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.132e-07 1.169e-08
25- 50 3.578e-07 2.705e-08
50-150 1.450e-06 1.485e-07
15-150 1.921e-06 1.425e-07
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: 1.23209 ( -0.0289808 0.0288908 )
Norm@50keV : 7.18336E-02 ( -0.00114662 0.00114516 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.60 using 59 PHA bins.
# Reduced chi-squared = 0.7825 for 57 degrees of freedom
# Null hypothesis probability = 8.837655e-01
Photon flux (15-150 keV) in 16.73 sec: 8.47186 ( -0.150361 0.150727 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20849e-05 ( -1.88525e-07 1.88564e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02120 ( -0.119402 0.11639 )
Epeak [keV] : 286.355 ( -80.2631 258.967 )
Norm@50keV : 8.75656E-02 ( -0.0088697 0.0100952 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.91 using 59 PHA bins.
# Reduced chi-squared = 0.6233 for 56 degrees of freedom
# Null hypothesis probability = 9.878805e-01
Photon flux (15-150 keV) in 16.73 sec: 8.33906 ( -0.16456 0.16533 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19912e-05 ( -1.97297e-07 1.96979e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.124846 ( -0.569282 2.43306 )
beta : -1.29382 ( -0.0496794 0.04649 )
Epeak [keV] : 63.5461 ( -33.6703 65.5126 )
Norm@50keV : 0.312413 ( -0.193566 14.1541 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 30.30 using 59 PHA bins.
# Reduced chi-squared = 0.5510 for 55 degrees of freedom
# Null hypothesis probability = 9.972601e-01
Photon flux (15-150 keV) in 16.73 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) = 3.06e-06
S(50-100 keV) = 4.88e-06
T90 vs. Hardness ratio plot
T90 = 18.055999994278 sec.
Hardness ratio (energy fluence ratio) = 1.59477
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.68404
Count Ratio (50-100 keV) / (15-25 keV) = 1.45993
Mask shadow pattern
IMX = 2.498364785083470E-01, IMY = -5.097982982999856E-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:
-219.803410 -5.532000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0034 -15.6498 0.8 37.1 110.3 7.5159 13.7 1.5 Sco X-1
254.4346 35.3262 1.5 21.3 -14.3 1.6594 7.5 1.5 Her X-1
268.4301 -1.3367 6.8 37.8 64.8 1.0499 1.7 7.9 SW J1753.5-0127
299.6074 35.1990 2.0 56.4 3.9 6.8948 5.8 0.9 Cyg X-1
212.0848 24.8825 2.7 23.3 -131.5 0.8574 4.3 ------ UNKNOWN
293.5407 51.9597 2.4 53.5 -17.0 2.7587 4.9 ------ UNKNOWN
244.0644 67.4243 2.9 47.1 -53.1 4.2156 4.0 ------ UNKNOWN
197.6791 46.5417 4.2 41.1 -98.3 3.0053 2.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-5.532000 11.196600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.1713 -15.6784 9.6 37.2 110.0 -0.5457 -1.2 11.3 Sco X-1
254.3361 35.2046 4.8 21.1 -14.2 0.3220 2.4 10.2 Her X-1
268.3713 -1.4834 29.9 37.9 65.1 -0.1732 -0.4 1.9 SW J1753.5-0127
299.5999 35.1838 11.1 56.4 3.9 1.0194 1.0 1.2 Cyg X-1
262.1300 4.0091 0.2 29.6 63.9 17.4519 70.0 ------ UNKNOWN
274.9777 23.8499 2.5 35.3 20.7 0.9198 4.5 ------ UNKNOWN
199.6916 31.9162 2.9 35.1 -120.2 0.5972 3.9 ------ UNKNOWN
191.0566 26.6415 2.9 42.3 -129.4 0.6583 4.0 ------ UNKNOWN
263.8307 68.5306 3.7 50.7 -44.5 1.5351 3.2 ------ UNKNOWN
189.7737 35.8379 3.8 43.8 -116.0 1.2331 3.1 ------ UNKNOWN
186.7048 30.5654 3.1 46.0 -123.7 1.6214 3.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
78.596600 962.359200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9900 -15.6342 0.3 25.9 115.2 31.3001 36.7 0.7 Sco X-1
254.4738 35.3300 1.6 32.1 -117.0 7.9137 7.0 1.1 Her X-1
262.9070 -24.5948 9.7 28.6 73.3 1.0890 1.2 10.6 GX 1+4
268.3213 -1.4360 3.5 8.2 25.9 2.1550 3.2 3.0 SW J1753.5-0127
270.3055 -25.1157 2.2 30.2 59.9 5.0382 5.2 2.5 GX 5-1
270.3137 -25.7101 3.2 30.7 60.2 3.5951 3.6 2.1 GRS 1758-258
273.9251 -14.1494 4.0 21.6 42.2 1.8685 2.8 8.2 GX 17+2
275.9216 -30.2709 4.3 36.7 54.6 3.6367 2.7 5.8 H1820-303
285.0331 -25.0534 13.1 36.6 38.5 0.9276 0.9 8.0 HT1900.1-2455
288.7949 10.9387 0.6 27.3 -31.5 12.3296 20.2 0.5 GRS 1915+105
262.9474 -33.8358 10.6 37.8 73.7 2.4974 1.1 2.1 GX 354-0
266.8521 -27.3220 1.0 31.6 66.8 12.7145 11.4 ------ UNKNOWN
310.2729 24.9210 5.1 50.7 -44.5 10.1912 2.3 ------ UNKNOWN
Plot creation:
Sun May 31 07:18:00 EDT 2015