| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB160206430 |
|
| T0 |
10:19:06.799 UTC |
Fermi_GBM |
| ra |
184.2600° |
Fermi_GBM |
| decl |
52.4100° |
Fermi_GBM |
| pos_error |
5.13e+00° |
Fermi_GBM |
| T90 |
21.504 s |
Fermi_GBM |
| T90_error |
4.199 s |
Fermi_GBM |
| T90_start |
10:19:06.799 UTC |
Fermi_GBM |
| fluence |
2.80e-06 erg/cm² |
Fermi_GBM |
| fluence_error |
5.21e-08 erg/cm² |
Fermi_GBM |
| T100 |
21.504 s |
|
| GBM_located |
True |
|
| mjd |
57424.42993980324 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB160206430 |
| trigger_name |
bn160206430 |
| ra |
184.2600° |
| decl |
52.4100° |
| pos_error |
5.13e+00° |
| datum |
2016-02-06 |
| t_trigger |
10:19:12.431 UTC |
| T90 |
21.504 s |
| T90_error |
4.199 s |
| T90_start |
10:19:06.799 UTC |
| fluence |
2.80e-06 erg/cm² |
| fluence_error |
5.21e-08 erg/cm² |
| flux_1024 |
3.03e+00 erg/cm²/s |
| flux_1024_error |
2.40e-01 erg/cm²/s |
| flux_1024_time |
3.39e+00 erg/cm²/s |
| flux_64 |
5.84e+00 erg/cm²/s |
| flux_64_error |
1.22e+00 erg/cm²/s |
| GCN 18995 table |
|---|
| GRB_name |
GRB160206B |
| GCN_number |
18995 |
| Detection_method |
iPTF |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18995
SUBJECT: GRB 160206B: iPTF P48 Observations and Optical Transient Candidates
DATE: 16/02/06 18:02:12 GMT
FROM: Leo Singer at GSFC/iPTF
L. P. Singer (NASA/GSFC), S. B. Cenko (NASA/GSFC), M. M. Kasliwal
(Caltech), and V. Bhalerao (IUCAA) report on behalf of a larger
collaboration:
Fermi GBM detected GRB 160206B (trigger 476446756 / bn160206430) at
2016-02-06 10:19:12.43. At 10:29:40, about 10 minutes after the burst, we
began searching for optical counterparts using the Palomar 48-inch Oschin
telescope (P48).
We imaged 114 fields covering an area of 379 deg^2 and covering most of
the 2-sigma statistical+systematic region of the final Fermi GBM
localization. We estimate a 84% prior probability that these fields
contain the true location of the source. Sifting through candidate
variable sources using image subtraction and standard iPTF vetting
procedures, we detected the following optical transient candidates:
name RA Dec mag t Notes
----------------------------------------------------------------------------
Hosts with spectroscopic redshifts
----------------------------------------------------------------------------
iPTF16ca 181.162415 +45.059301 19.97 +2.39 z=0.190, host is an X-ray source
iPTF16ce 188.768138 +47.301857 20.27 +2.81 z=0.131
iPTF16ch 189.333005 +51.432720 20.70 +1.82 z=0.120
iPTF16cc 187.973175 +45.076476 19.12 +2.73 z=0.062, poor subtraction in interacting host galaxy
iPTF16cl 170.605169 +59.384422 20.12 +1.79 z=0.051
iPTF16cd 187.947490 +47.927964 19.48 +1.39 z=0.030
----------------------------------------------------------------------------
Hosts with photometric redshifts
----------------------------------------------------------------------------
iPTF16cg 175.872772 +50.316844 19.65 +2.30 z=0.31
iPTF16ci 180.780807 +53.977868 19.49 +1.73 z=0.27
iPTF16ck 193.756732 +57.354180 20.42 +2.93 z=0.19
iPTF16cf 197.002541 +48.632699 20.05 +2.08 z=0.13
iPTF16bx 116.788070 +22.170396 19.20 -1.32 z=0.09
Times are in hours since the GBM trigger. Magnitudes are in the Mould R
filter and in the AB system, calibrated with respect to point sources in
SDSS as described in Ofek et al. (2012, http://dx.doi.org/10.1086/664065).
Further observations of the above candidates are encouraged to determine
their nature and if one of them is the optical afterglow of the GRB. We
have scheduled additional imaging of the P48 fields tonight.
The diagram http://asd.gsfc.nasa.gov/Brad.Cenko/Fermi476446756.pdf
shows the locations of our candidates and the P48 fields in relation to
the Fermi GBM 1-, 2-, and 3-sigma statistical+systematic contours.
|
| GCN 19006 table |
|---|
| GRB_name |
GRB160206B |
| GCN_number |
19006 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
10:19:12.430 UTC |
| ra |
184.3000° |
| decl |
52.4000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 19006
SUBJECT: GRB 160206B: Fermi GBM detection
DATE: 16/02/09 17:07:58 GMT
FROM: Oliver Roberts at UCD/Fermi
O.J. Roberts (UCD) and C. Meegan (UAH) report on
behalf of the Fermi GBM Team:
"At 10:19:12.43 UT on 06 February 2016, the Fermi
Gamma-Ray Burst Monitor triggered and located GRB
160206B (trigger 476446756 / 160206430). A list of
optical candidates were observed by iPTF within the
2-sigma statistical+systematic region of the final
on-ground calculated location (Singer et al., GCN 18995).
The on-ground calculated location, using the GBM trigger
data, is RA = 184.3, DEC = 52.4 (J2000 degrees,
equivalent to 12h 17m, 52d 24'), with an uncertainty of
4.2 degrees (radius, 1-sigma containment, statistical only;
there is additionally a systematic error which we have
characterized as a core-plus-tail model, with 90% of GRBs
having a 3.7 deg error and a small tail suffering a larger
than 10 deg systematic error.
[Connaughton et al. 2015, ApJS, 216, 32]).
The angle from the Fermi LAT boresight is about 83 degrees.
The GBM light curve consists of a FRED-like pulse with a
duration (T90) of about 21.5 s (50-300 keV). The
time-averaged spectrum from T0-4.9 s to T0+16.6 s is best
fit by a power law function with an exponential high-energy
cutoff. The power law index is -0.93 +/- 0.10 and the cutoff
energy, parameterized as Epeak, is 356.0 +/- 69.5 keV.
The event fluence (10-1000 keV) in this time interval is
(4.6 +/- 0.4)E-06 erg/cm^2. The 1.024-sec peak photon flux
measured starting from T0+3.4 s in the 10-1000 keV band is
3.0 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|