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
186.0237 15.7237 0.0109 19.9952 135.4237 1.9565756 17.543 TRIG_00450884
Foreground time interval of the image:
-2.900 73.301 (delta_t = 76.201 [sec])
Background time interval of the image:
-239.000 -2.900 (delta_t = 236.100 [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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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 -2.900 sec. to 178.516 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73080 ( -0.123702 0.126449 )
Norm@50keV : 1.13137E-03 ( -8.67424e-05 8.58899e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.71 using 59 PHA bins.
# Reduced chi-squared = 0.9598 for 57 degrees of freedom
# Null hypothesis probability = 5.614484e-01
Photon flux (15-150 keV) in 181.4 sec: 0.151912 ( -0.0105104 0.0105189 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89597e-06 ( -1.51162e-07 1.53002e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.900 sec. to 178.516 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.737274 ( -0.689957 0.593731 )
Epeak [keV] : 57.7805 ( -8.74693 21.7011 )
Norm@50keV : 3.86385E-03 ( -0.00198444 0.00514088 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.84 using 59 PHA bins.
# Reduced chi-squared = 0.8185 for 56 degrees of freedom
# Null hypothesis probability = 8.318219e-01
Photon flux (15-150 keV) in 181.4 sec: 0.144332 ( -0.011355 0.01136 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72475e-06 ( -1.7136e-07 1.78463e-07 ) ergs/cm2
Band function
Time interval is from -2.900 sec. to 178.516 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.717928 ( -0.598383 1.02343 )
beta : -2.84313 ( 2.75274 0.784854 )
Epeak [keV] : 56.9904 ( -12.6841 21.9117 )
Norm@50keV : 3.98703E-03 ( -0.00229814 0.0118634 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.69 using 59 PHA bins.
# Reduced chi-squared = 0.8308 for 55 degrees of freedom
# Null hypothesis probability = 8.101259e-01
Photon flux (15-150 keV) in 181.4 sec: 0.144354 ( 6.85565 -0.011309 ) 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] : 12.3696 (-0.925957 1.01351)
R^2/D10^2 : 3.30968E-02 (-0.00833834 0.0109947)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.66 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 57 degrees of freedom
# Null hypothesis probability = 1.788778e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.947e-07 2.415e-08
25- 50 6.345e-07 4.762e-08
50-150 5.954e-07 9.886e-08
15-150 1.425e-06 1.110e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 116.879 (-29.9415 41.8829)
Norm : 0.643537 (-0.0549339 0.070463)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.29 using 59 PHA bins.
# Reduced chi-squared = 0.8471 for 57 degrees of freedom
# Null hypothesis probability = 7.877137e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.044e-07 3.156e-08
25- 50 5.420e-07 5.342e-08
50-150 9.547e-07 3.449e-07
15-150 1.801e-06 3.413e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.65666 (-1.60583 3.6355)
R1^2/D10^2 : 1.53710 (-1.38823 47.4909)
kT2 [keV] : 14.6345 (-1.78519 4.97319)
R2^2/D10^2 : 1.62580E-02 (-0.0118887 0.00952262)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.76 using 59 PHA bins.
# Reduced chi-squared = 0.8502 for 55 degrees of freedom
# Null hypothesis probability = 7.775463e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.941e-07 1.113e-07
25- 50 5.601e-07 1.058e-07
50-150 7.431e-07 1.536e-07
15-150 1.597e-06 2.417e-07
Peak spectrum fit
Power-law model
Time interval is from 27.640 sec. to 28.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05720 ( -0.531931 0.47904 )
Norm@50keV : 4.55356E-03 ( -0.00118537 0.00117192 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.68 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 57 degrees of freedom
# Null hypothesis probability = 4.135429e-01
Photon flux (15-150 keV) in 1 sec: 0.526211 ( -0.139684 0.140215 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.82804e-08 ( -1.35865e-08 1.37965e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 27.640 sec. to 28.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06560 ( -0.548739 0.470017 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.56277E-03 ( -0.00117048 0.0128182 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.69 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 56 degrees of freedom
# Null hypothesis probability = 3.770172e-01
Photon flux (15-150 keV) in 1 sec: 0.528113 ( -0.141923 0.138244 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.82572e-08 ( -1.35322e-08 1.35882e-08 ) ergs/cm2
Band function
Time interval is from 27.640 sec. to 28.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.860318 ( 0.860318 0.860318 )
beta : -1.05717 ( 1.05717 0.531802 )
Epeak [keV] : 59.5528 ( -59.5528 -59.5528 )
Norm@50keV : 7.56876E-03 ( -0.00417755 231748 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.68 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 55 degrees of freedom
# Null hypothesis probability = 3.420455e-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] : 22.8013 (-8.09765 17.1268)
R^2/D10^2 : 1.58819E-02 (-0.0157247 0.0485766)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.97 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 57 degrees of freedom
# Null hypothesis probability = 2.452541e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.503e-09 9.505e-10
25- 50 8.113e-09 4.739e-09
50-150 3.151e-08 1.958e-08
15-150 4.113e-08 2.432e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.15899 (-0.57427 0.574241)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.93 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.046118e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.379e-09 3.307e-09
25- 50 1.035e-08 6.210e-09
50-150 2.269e-08 1.381e-08
15-150 3.842e-08 2.288e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.27692 (-4.20107 9.74308)
R1^2/D10^2 : 0.449881 (-0.42024 13.6922)
kT2 [keV] : 47.4602 (-26.6395 -47.3876)
R2^2/D10^2 : 1.72570E-03 (-0.00160706 0.0156274)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.28 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 55 degrees of freedom
# Null hypothesis probability = 3.557281e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.419e-09 2.585e-09
25- 50 9.020e-09 5.215e-09
50-150 3.769e-08 2.058e-08
15-150 5.113e-08 2.681e-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: 1.53590 ( -0.136476 0.138237 )
Norm@50keV : 1.68675E-03 ( -0.000139287 0.000138476 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.47 using 59 PHA bins.
# Reduced chi-squared = 0.9030 for 57 degrees of freedom
# Null hypothesis probability = 6.816869e-01
Photon flux (15-150 keV) in 76.2 sec: 0.212671 ( -0.0169331 0.016951 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21248e-06 ( -1.09177e-07 1.10396e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.393295 ( -0.825928 0.689794 )
Epeak [keV] : 66.6569 ( -11.3539 31.922 )
Norm@50keV : 6.63293E-03 ( -0.00368643 0.0110527 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.69 using 59 PHA bins.
# Reduced chi-squared = 0.7624 for 56 degrees of freedom
# Null hypothesis probability = 9.047317e-01
Photon flux (15-150 keV) in 76.2 sec: 0.201031 ( -0.018292 0.018253 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09378e-06 ( -1.24503e-07 1.29045e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.15441E-02 ( -1.02741 1.48667 )
beta : -2.28185 ( 2.3064 0.545786 )
Epeak [keV] : 57.2963 ( -16.0003 31.293 )
Norm@50keV : 1.20997E-02 ( -0.00608695 0.0869959 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.98 using 59 PHA bins.
# Reduced chi-squared = 0.7633 for 55 degrees of freedom
# Null hypothesis probability = 9.015385e-01
Photon flux (15-150 keV) in 76.2 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11126e-06 ( -1.11072e-06 -1.27262e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 5.20e-07
S(50-100 keV) = 6.26e-07
T90 vs. Hardness ratio plot
T90 = 155.567999958992 sec.
Hardness ratio (energy fluence ratio) = 1.20385
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.34325
Count Ratio (50-100 keV) / (15-25 keV) = 0.763425
Mask shadow pattern
IMX = -2.591940828177663E-01, IMY = -2.553889295409928E-01
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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 -2.900000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9809 -15.6351 0.9 50.1 -3.6 5.5792 13.3 0.3 Sco X-1
208.0547 48.8844 2.9 31.5 -131.2 0.9656 3.9 ------ UNKNOWN
246.1343 17.3208 2.1 37.5 -48.7 1.4570 5.6 ------ UNKNOWN
261.6547 -5.9384 2.5 59.0 -24.3 5.8424 4.6 ------ UNKNOWN
176.5633 69.4347 5.8 55.3 -145.2 2.4447 2.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.900000 73.300610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0357 -15.7160 4.7 50.2 -3.6 0.5959 2.4 5.6 Sco X-1
186.0237 15.7242 0.7 20.0 135.4 1.9645 17.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
146.100600 963.035900
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
187.8588 -1.4241 2.6 17.3 108.5 1.9680 4.4 ------ UNKNOWN
200.0085 11.6216 2.6 14.2 39.9 1.8163 4.3 ------ UNKNOWN
239.6768 42.4881 2.6 52.8 -17.1 5.0424 4.4 ------ UNKNOWN
128.2432 17.0097 5.7 55.2 -145.2 6.8266 2.1 ------ UNKNOWN
Plot creation:
Sat May 30 22:35:41 EDT 2015