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
329.7078 -22.4963 0.0049 17.9464 -9.3044 2.3592734 39.353 TRIG_00213823
Foreground time interval of the image:
-23.628 15.109 (delta_t = 38.737 [sec])
Background time interval of the image:
-239.592 -23.628 (delta_t = 215.964 [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 -23.628 sec. to 102.252 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44382 ( -0.0732599 0.0733218 )
Norm@50keV : 2.12799E-03 ( -8.49749e-05 8.49152e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.58 using 59 PHA bins.
# Reduced chi-squared = 0.7646 for 57 degrees of freedom
# Null hypothesis probability = 9.045238e-01
Photon flux (15-150 keV) in 125.9 sec: 0.261852 ( -0.0108762 0.0108845 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56669e-06 ( -1.12367e-07 1.12805e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -23.628 sec. to 102.252 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14734 ( -0.302719 0.282897 )
Epeak [keV] : 149.843 ( -50.709 1144.74 )
Norm@50keV : 2.95870E-03 ( -0.000776605 0.00114574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.37 using 59 PHA bins.
# Reduced chi-squared = 0.7209 for 56 degrees of freedom
# Null hypothesis probability = 9.426960e-01
Photon flux (15-150 keV) in 125.9 sec: 0.257085 ( -0.011726 0.011733 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50787e-06 ( -1.26895e-07 1.26341e-07 ) ergs/cm2
Band function
Time interval is from -23.628 sec. to 102.252 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14856 ( -0.535409 0.831591 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 150.051 ( -31.5414 1141.18 )
Norm@50keV : 2.95555E-03 ( -0.000773302 0.00114905 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.37 using 59 PHA bins.
# Reduced chi-squared = 0.7340 for 55 degrees of freedom
# Null hypothesis probability = 9.302098e-01
Photon flux (15-150 keV) in 125.9 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] : 16.1797 ( )
R^2/D10^2 : 2.25270E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 160.89 using 59 PHA bins.
# Reduced chi-squared = 2.8226 for 57 degrees of freedom
# Null hypothesis probability = 7.651107e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.531e-07 1.265e-08
25- 50 6.505e-07 3.280e-08
50-150 1.195e-06 8.970e-08
15-150 1.999e-06 9.443e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.07259 (-0.0431155 0.0431192)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.78 using 59 PHA bins.
# Reduced chi-squared = 0.8382 for 57 degrees of freedom
# Null hypothesis probability = 8.028839e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.381e-07 1.517e-08
25- 50 6.505e-07 2.845e-08
50-150 1.427e-06 6.106e-08
15-150 2.415e-06 1.058e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.26273 (-1.0794 1.20138)
R1^2/D10^2 : 0.218480 (-0.084503 0.160025)
kT2 [keV] : 26.8215 (-3.43781 5.15573)
R2^2/D10^2 : 3.19896E-03 (-0.00148108 0.00209683)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.52 using 59 PHA bins.
# Reduced chi-squared = 0.7549 for 55 degrees of freedom
# Null hypothesis probability = 9.104377e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.902e-07 4.488e-08
25- 50 6.396e-07 6.723e-08
50-150 1.564e-06 2.461e-07
15-150 2.494e-06 3.040e-07
Peak spectrum fit
Power-law model
Time interval is from -0.968 sec. to 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07759 ( -0.158922 0.155819 )
Norm@50keV : 1.21353E-02 ( -0.00107184 0.00107005 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.87 using 59 PHA bins.
# Reduced chi-squared = 0.5591 for 57 degrees of freedom
# Null hypothesis probability = 9.971518e-01
Photon flux (15-150 keV) in 1 sec: 1.40472 ( -0.127009 0.12726 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27798e-07 ( -1.24686e-08 1.2543e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.968 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07235 ( -0.568914 0.386777 )
Epeak [keV] : 9995.02 ( )
Norm@50keV : 1.22030E-02 ( -0.00107225 0.0121089 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.87 using 59 PHA bins.
# Reduced chi-squared = 0.5690 for 56 degrees of freedom
# Null hypothesis probability = 9.961140e-01
Photon flux (15-150 keV) in 1 sec: 1.40496 ( -0.13454 0.12649 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27481e-07 ( -1.3146e-08 1.2826e-08 ) ergs/cm2
Band function
Time interval is from -0.968 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.796442 ( 0.781473 0.781473 )
beta : -1.07952 ( 1.08367 0.164513 )
Epeak [keV] : 90.0754 ( -97.9086 -97.9086 )
Norm@50keV : 2.05578E-02 ( -0.00977985 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.86 using 59 PHA bins.
# Reduced chi-squared = 0.5793 for 55 degrees of freedom
# Null hypothesis probability = 9.947368e-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] : 21.2046 (-2.53358 3.01113)
R^2/D10^2 : 5.48456E-02 (-0.0187957 0.0276165)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.78 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 57 degrees of freedom
# Null hypothesis probability = 4.462427e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.639e-09 8.395e-10
25- 50 2.399e-08 3.530e-09
50-150 8.046e-08 1.235e-08
15-150 1.091e-07 1.336e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.73426 (-0.522791 0.52276)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.87 using 59 PHA bins.
# Reduced chi-squared = 0.9978 for 57 degrees of freedom
# Null hypothesis probability = 4.797723e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.428e-08 2.530e-09
25- 50 2.747e-08 1.095e-08
50-150 6.025e-08 3.191e-08
15-150 1.020e-07 4.353e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.33981 (-2.53194 3.58986)
R1^2/D10^2 : 0.907909 (-0.63328 3.2231)
kT2 [keV] : 32.4035 (-7.30043 22.0388)
R2^2/D10^2 : 1.26351E-02 (-0.00995563 0.0167266)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.57 using 59 PHA bins.
# Reduced chi-squared = 0.5922 for 55 degrees of freedom
# Null hypothesis probability = 9.930735e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.021e-08 4.776e-09
25- 50 2.491e-08 9.629e-09
50-150 9.253e-08 4.128e-08
15-150 1.277e-07 4.790e-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: 1.34699 ( -0.0741416 0.0739748 )
Norm@50keV : 3.91565E-03 ( -0.000158798 0.000158756 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.93 using 59 PHA bins.
# Reduced chi-squared = 0.7005 for 57 degrees of freedom
# Null hypothesis probability = 9.581643e-01
Photon flux (15-150 keV) in 38.74 sec: 0.471432 ( -0.0199757 0.0200082 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48254e-06 ( -6.62535e-08 6.6491e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10382 ( -0.304385 0.265528 )
Epeak [keV] : 194.944 ( -79.9468 -194.944 )
Norm@50keV : 5.11833E-03 ( -0.00126447 0.00197311 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.81 using 59 PHA bins.
# Reduced chi-squared = 0.6752 for 56 degrees of freedom
# Null hypothesis probability = 9.703236e-01
Photon flux (15-150 keV) in 38.74 sec: 0.464931 ( -0.021307 0.021315 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45621e-06 ( -7.40864e-08 7.36176e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.389945 ( -0.600842 0.649219 )
beta : -1.45663 ( -1.46918 0.134745 )
Epeak [keV] : 61.9805 ( -34.602 286.16 )
Norm@50keV : 1.45559E-02 ( -0.00919008 110.429 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.85 using 59 PHA bins.
# Reduced chi-squared = 0.6519 for 55 degrees of freedom
# Null hypothesis probability = 9.787666e-01
Photon flux (15-150 keV) in 38.74 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) = 6.17e-07
S(50-100 keV) = 9.07e-07
T90 vs. Hardness ratio plot
T90 = 103.032000005245 sec.
Hardness ratio (energy fluence ratio) = 1.47002
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.43937
Count Ratio (50-100 keV) / (15-25 keV) = 1.11769
Mask shadow pattern
IMX = 3.196239141052718E-01, IMY = 5.236545093759146E-02
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:
-239.592000 -23.628000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.7982 10.9099 3.3 37.3 130.7 1.2280 3.5 2.1 GRS 1915+105
299.5626 35.2038 1.0 46.5 168.0 4.0633 11.5 1.4 Cyg X-1
308.0766 40.9971 4.9 48.8 179.6 0.7166 2.3 3.1 Cyg X-3
325.9712 38.4338 10.1 44.6 -162.1 -0.3118 -1.1 11.6 Cyg X-2
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-23.628000 15.108600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.8520 10.9959 11.2 37.3 130.9 0.1362 1.0 4.4 GRS 1915+105
299.6126 35.2006 14.8 46.4 168.1 -0.1073 -0.8 1.1 Cyg X-1
308.0713 40.9830 4.2 48.8 179.6 -0.4010 -2.7 2.5 Cyg X-3
326.0079 38.3509 8.7 44.6 -162.0 0.1465 1.3 7.9 Cyg X-2
296.5371 9.8991 2.3 30.1 135.6 0.4307 4.9 ------ UNKNOWN
309.1658 -36.6919 2.2 32.9 33.2 0.5000 5.3 ------ UNKNOWN
329.7078 -22.4963 0.3 17.9 -9.3 2.3592 39.4 ------ UNKNOWN
341.7371 13.5561 2.8 27.6 -121.7 0.3081 4.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
54.508600 962.478700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
359.4347 11.5653 3.6 44.8 -119.9 6.1565 3.2 ------ UNKNOWN
Plot creation:
Sun May 31 12:50:08 EDT 2015