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
299.1724 -26.4689 0.0205 28.5240 -83.3437 0.7028538 9.392 TRIG_00420398
Foreground time interval of the image:
-2.064 18.285 (delta_t = 20.349 [sec])
Background time interval of the image:
-239.816 -2.064 (delta_t = 237.752 [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)
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 -2.064 sec. to 39.428 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.43681 ( -0.305951 0.346267 )
Norm@50keV : 1.13551E-03 ( -0.000280728 0.000277733 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.30 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 57 degrees of freedom
# Null hypothesis probability = 3.916241e-01
Photon flux (15-150 keV) in 41.49 sec: 0.214712 ( -0.03237 0.0323717 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.63547e-07 ( -8.61884e-08 9.05457e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.064 sec. to 39.428 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.876178 ( -2.44646 1.12782 )
Epeak [keV] : 25.4036 ( -24.4829 9.26397 )
Norm@50keV : 1.11363E-02 ( -0.0111435 0.439498 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.65 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.504668e-01
Photon flux (15-150 keV) in 41.49 sec: 0.206092 ( -0.032933 0.033216 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.08357e-07 ( -7.9448e-08 1.00327e-07 ) ergs/cm2
Band function
Time interval is from -2.064 sec. to 39.428 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.905328 ( -4.56821 1.74632 )
beta : -9.37167 ( 9.37167 19.3716 )
Epeak [keV] : 25.2870 ( -6.29148 9.41308 )
Norm@50keV : 1.06367E-02 ( -0.0106395 850596 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.65 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 55 degrees of freedom
# Null hypothesis probability = 4.130839e-01
Photon flux (15-150 keV) in 41.49 sec: 0.206330 ( ) 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] : 7.69274 (-1.11974 1.29601)
R^2/D10^2 : 0.278669 (-0.132001 0.254797)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.46 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.862298e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.200e-07 3.232e-08
25- 50 1.960e-07 4.898e-08
50-150 4.516e-08 2.287e-08
15-150 3.611e-07 8.800e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 33.8168 (-10.0944 16.4292)
Norm : 1.57257 (-0.421414 0.615885)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.83 using 59 PHA bins.
# Reduced chi-squared = 0.9971 for 57 degrees of freedom
# Null hypothesis probability = 4.813256e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.405e-07 2.672e-08
25- 50 1.710e-07 3.466e-08
50-150 1.089e-07 5.733e-08
15-150 4.204e-07 8.599e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.47519 (-1.65632 2.29094)
R1^2/D10^2 : 1500.32 ( )
kT2 [keV] : 8.44557 (-1.38233 5.02768)
R2^2/D10^2 : 0.178682 (-0.164582 0.0828571)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.12 using 59 PHA bins.
#Fit statistic : Chi-Squared = 54.98 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 55 degrees of freedom
# Reduced chi-squared = 0.9996 for 55 degrees of freedom
# Null hypothesis probability = 4.702178e-01
# Null hypothesis probability = 4.754389e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.305e-07 5.485e-08
25- 50 1.882e-07 8.420e-08
50-150 6.346e-08 3.782e-08
15-150 3.821e-07 1.556e-07
Peak spectrum fit
Power-law model
Time interval is from 0.232 sec. to 1.232 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.35659 ( -0.309397 0.3452 )
Norm@50keV : 7.59650E-03 ( -0.00191019 0.00188311 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.60 using 59 PHA bins.
# Reduced chi-squared = 0.8878 for 57 degrees of freedom
# Null hypothesis probability = 7.123023e-01
Photon flux (15-150 keV) in 1 sec: 1.37065 ( -0.233415 0.233416 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.34035e-08 ( -1.48047e-08 1.54033e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.232 sec. to 1.232 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 8.71519E-02 ( -2.9958 1.88401 )
Epeak [keV] : 29.1626 ( )
Norm@50keV : 0.220109 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.74 using 59 PHA bins.
# Reduced chi-squared = 0.8168 for 56 degrees of freedom
# Null hypothesis probability = 8.344424e-01
Photon flux (15-150 keV) in 1 sec: 1.31635 ( -0.23147 0.23265 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.23477e-08 ( -1.22412e-08 1.46664e-08 ) ergs/cm2
Band function
Time interval is from 0.232 sec. to 1.232 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.388259 ( -1.78273 -0.781157 )
beta : -4.03292 ( 3.93846 1.48111 )
Epeak [keV] : 29.4208 ( -8.18366 6.71654 )
Norm@50keV : 0.458412 ( -0.437557 669.049 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.64 using 59 PHA bins.
# Reduced chi-squared = 0.8298 for 55 degrees of freedom
# Null hypothesis probability = 8.116716e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.4568e-08 ( -6.4561e-08 -1.40346e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.89420 (-1.18223 1.37789)
R^2/D10^2 : 1.67758 (-0.819701 1.59027)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.59 using 59 PHA bins.
# Reduced chi-squared = 0.8174 for 57 degrees of freedom
# Null hypothesis probability = 8.359397e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.871e-08 5.455e-09
25- 50 3.200e-08 8.950e-09
50-150 8.042e-09 3.894e-09
15-150 5.876e-08 1.502e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 35.5825 (-10.9482 18.7948)
Norm : 9.83782 (-2.76895 3.93808)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.11 using 59 PHA bins.
# Reduced chi-squared = 0.8264 for 57 degrees of freedom
# Null hypothesis probability = 8.219804e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.164e-08 4.640e-09
25- 50 2.699e-08 6.690e-09
50-150 1.828e-08 9.435e-09
15-150 6.691e-08 1.723e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.352 ( )
R1^2/D10^2 : 4.06410E-05 (-4.15769e-05 -4.15769e-05)
kT2 [keV] : 7.63343 (-7.63084 1.37835)
R2^2/D10^2 : 1.88322 (-0.861885 55.295)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.66 using 59 PHA bins.
#Fit statistic : Chi-Squared = 45.40 using 59 PHA bins.
# Reduced chi-squared = 0.8302 for 55 degrees of freedom
# Reduced chi-squared = 0.8255 for 55 degrees of freedom
# Null hypothesis probability = 8.110939e-01
# Null hypothesis probability = 8.186357e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.010e-08 1.039e-08
25- 50 3.052e-08 1.735e-08
50-150 1.047e-08 6.675e-09
15-150 6.108e-08 3.194e-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: 2.52504 ( -0.306069 0.346567 )
Norm@50keV : 1.67597E-03 ( -0.000420705 0.000419657 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.31 using 59 PHA bins.
# Reduced chi-squared = 0.8651 for 57 degrees of freedom
# Null hypothesis probability = 7.556100e-01
Photon flux (15-150 keV) in 20.35 sec: 0.334353 ( -0.0487891 0.0487946 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.43398e-07 ( -6.21347e-08 6.53127e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41804 ( -2.09268 0.582244 )
Epeak [keV] : 17.9806 ( )
Norm@50keV : 8.76406E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.62 using 59 PHA bins.
# Reduced chi-squared = 0.8503 for 56 degrees of freedom
# Null hypothesis probability = 7.797898e-01
Photon flux (15-150 keV) in 20.35 sec: 0.325167 ( -0.04923 0.049717 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10242e-07 ( -6.08139e-08 7.55229e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.42552 ( -0.643454 1.56797 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 17.9577 ( -5.51347 12.7389 )
Norm@50keV : 8.62566E-03 ( -0.0012495 0.222098 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.62 using 59 PHA bins.
# Reduced chi-squared = 0.8658 for 55 degrees of freedom
# Null hypothesis probability = 7.497223e-01
Photon flux (15-150 keV) in 20.35 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) = 1.53e-07
S(50-100 keV) = 1.13e-07
T90 vs. Hardness ratio plot
T90 = 38.9679999351501 sec.
Hardness ratio (energy fluence ratio) = 0.738562
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.18613
Count Ratio (50-100 keV) / (15-25 keV) = 0.234185
Mask shadow pattern
IMX = 6.299890713493866E-02, IMY = 5.398339803588269E-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:
-239.816000 -2.064000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9856 -15.6525 0.4 22.8 95.1 7.7928 29.0 0.8 Sco X-1
255.9056 -37.9809 17.2 18.8 23.2 0.1425 0.7 9.1 4U 1700-377
256.4371 -36.3866 6.7 17.3 25.3 0.3593 1.7 2.2 GX 349+2
262.9337 -24.6543 10.8 5.2 55.4 0.2032 1.1 6.8 GX 1+4
264.7513 -44.4520 4.0 22.2 -1.6 0.6687 2.9 0.4 4U 1735-44
268.4914 -1.5785 10.2 20.8 173.2 0.2445 1.1 10.6 SW J1753.5-0127
270.3153 -25.1001 6.4 3.4 -44.3 0.4010 1.9 2.1 GX 5-1
270.3688 -25.6719 3.3 3.9 -39.7 0.8417 4.0 5.6 GRS 1758-258
273.9540 -13.9633 3.9 10.1 -153.5 0.6414 3.0 5.3 GX 17+2
276.0165 -30.3653 8.4 10.7 -47.9 0.2963 1.4 4.7 H1820-303
284.8744 -24.7735 0.0 15.6 -85.8 0.0354 0.2 12.5 HT1900.1-2455
288.7733 10.9523 1.3 39.0 -154.5 3.0662 8.7 1.5 GRS 1915+105
263.0754 -33.7740 6.1 12.2 12.2 0.4242 1.9 5.6 GX 354-0
225.5993 -22.4098 2.8 39.2 73.6 3.1851 4.1 ------ UNKNOWN
320.9796 -54.7577 2.9 50.7 -44.4 5.0600 3.9 ------ UNKNOWN
313.8062 -29.9935 3.1 41.5 -77.4 3.5311 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.064000 18.284600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.7896 -15.7339 0.0 23.0 94.8 0.1933 2.9 12.3 Sco X-1
255.9850 -37.8710 147.2 18.7 23.2 0.0039 0.1 1.6 4U 1700-377
256.4380 -36.4168 40.1 17.3 25.2 -0.0146 -0.3 0.4 GX 349+2
262.9548 -24.6209 6.5 5.2 55.6 0.0878 1.8 8.0 GX 1+4
264.9706 -44.3255 0.0 22.1 -2.0 -0.1452 -2.7 12.3 4U 1735-44
268.2883 -1.5292 9.3 20.9 172.6 0.0655 1.2 6.6 SW J1753.5-0127
270.0993 -25.2095 0.0 3.4 -40.5 0.0821 1.6 12.7 GX 5-1
270.3878 -25.9033 11.0 4.1 -38.2 0.0536 1.1 10.7 GRS 1758-258
273.8465 -14.0917 71.3 9.9 -153.6 -0.0077 -0.2 9.8 GX 17+2
276.0417 -30.3359 4.8 10.7 -48.1 0.1153 2.4 6.3 H1820-303
285.1679 -25.0667 12.7 15.9 -84.8 0.0515 0.9 11.3 HT1900.1-2455
288.6771 10.9874 5.4 39.0 -154.7 -0.1503 -2.1 7.6 GRS 1915+105
262.9937 -33.8225 13.0 12.3 12.4 0.0420 0.9 0.8 GX 354-0
292.6154 -17.9259 2.0 23.4 -104.4 0.3500 5.8 ------ UNKNOWN
299.1721 -26.4660 1.2 28.5 -83.3 0.7049 9.4 ------ UNKNOWN
311.8331 -43.9606 2.4 41.8 -56.2 0.6369 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
68.084600 962.250600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.1020 -37.9354 6.0 37.8 72.0 -2.7721 -1.9 7.7 4U 1700-377
256.4871 -36.5098 11.2 37.4 74.3 1.5515 1.0 5.8 GX 349+2
262.9410 -24.7495 4.4 32.6 95.4 2.8299 2.6 3.7 GX 1+4
264.8377 -44.6052 771.5 32.9 58.2 0.0134 0.0 10.2 4U 1735-44
268.4990 -1.5007 6.0 38.6 135.7 2.4301 1.9 8.4 SW J1753.5-0127
270.4549 -24.9848 9.6 25.9 97.4 -0.9476 -1.2 10.9 GX 5-1
270.2589 -25.6068 11.4 25.9 95.9 0.7938 1.0 8.5 GRS 1758-258
274.0393 -14.0776 1.7 26.6 123.4 4.5570 6.7 3.1 GX 17+2
275.8849 -30.3850 3.5 20.8 84.2 1.9414 3.3 2.3 H1820-303
285.0201 -24.9903 6.3 12.8 104.0 0.8751 1.8 4.3 HT1900.1-2455
288.7848 10.9248 0.7 38.7 174.1 11.7734 15.9 1.5 GRS 1915+105
262.8672 -33.9294 5.7 32.1 78.2 -2.0517 -2.0 8.3 GX 354-0
265.5826 -76.9422 2.6 53.0 19.6 9.6527 4.4 ------ UNKNOWN
283.5526 23.0813 2.4 51.8 172.2 7.6044 4.8 ------ UNKNOWN
325.9297 12.7874 4.7 47.1 -132.6 5.2519 2.5 ------ UNKNOWN
358.9421 -42.8038 3.7 50.7 -44.4 12.7373 3.1 ------ UNKNOWN
Plot creation:
Sun May 31 01:43:00 EDT 2015