| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB160104475 |
|
| T0 |
11:24:09.636 UTC |
Fermi_GBM |
| ra |
76.7960° |
Swift |
| decl |
11.3238° |
Swift |
| pos_error |
8.28e-05° |
Swift |
| T90 |
8.704 s |
Fermi_GBM |
| T90_error |
2.896 s |
Fermi_GBM |
| T90_start |
11:24:09.636 UTC |
Fermi_GBM |
| fluence |
4.82e-07 erg/cm² |
Fermi_GBM |
| fluence_error |
2.15e-08 erg/cm² |
Fermi_GBM |
| redshift |
2.8000 |
GCN_circulars,Other |
| T100 |
16.564 s |
|
| GBM_located |
False |
|
| mjd |
57391.475111527776 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB160104475 |
| trigger_name |
bn160104475 |
| ra |
76.7967° |
| decl |
11.3239° |
| pos_error |
1.29e+01° |
| datum |
2016-01-04 |
| t_trigger |
11:24:13.220 UTC |
| T90 |
8.704 s |
| T90_error |
2.896 s |
| T90_start |
11:24:09.636 UTC |
| fluence |
4.82e-07 erg/cm² |
| fluence_error |
2.15e-08 erg/cm² |
| flux_1024 |
1.93e+00 erg/cm²/s |
| flux_1024_error |
1.98e-01 erg/cm²/s |
| flux_1024_time |
-3.97e+00 erg/cm²/s |
| flux_64 |
4.01e+00 erg/cm²/s |
| flux_64_error |
1.04e+00 erg/cm²/s |
| IPN table |
|---|
| GRB_name |
GRB160104A |
| ra |
76.8042° |
| decl |
11.3500° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB160104A |
| t_trigger |
11:24:10 UTC |
| ra |
76.7960° |
| decl |
11.3238° |
| pos_error |
8.28e-05° |
| T90 |
16.2 s |
| fluence |
4.00e-07 erg/cm² |
| GCN 18815 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18815 |
| Detection_method |
Swift Det |
| t_trigger |
11:24:10 UTC |
| ra |
76.8040° |
| decl |
11.3540° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18815
SUBJECT: GRB 160104A: Swift detection of a burst
DATE: 16/01/04 11:39:40 GMT
FROM: David Burrows at PSU/Swift
A. Melandri (INAF-OAB), A. P. Beardmore (U Leicester),
D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC),
P. D'Avanzo (INAF-OAB), P.A. Evans (U Leicester), C. Gronwall (PSU)
and K. L. Page (U Leicester) report on behalf of the Swift Team:
At 11:24:10 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 160104A (trigger=669319). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 76.804, +11.354 which is
RA(J2000) = 05h 07m 13s
Dec(J2000) = +11d 21' 14"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed multiple weak peaks
with a duration of about 20 sec. The peak count rate was ~1929 counts/sec
(15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 11:25:30.0 UT, 79.3 seconds after
the BAT trigger. Using promptly downlinked data we find a fading,
uncatalogued X-ray source with an enhanced position: RA, Dec 76.7965,
11.3239 which is equivalent to:
RA(J2000) = 05h 07m 11.17s
Dec(J2000) = +11d 19' 25.9"
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This
location is 111 arcseconds from the BAT onboard position, within the
BAT error circle. This position may be improved as more data are
received; the latest position is available at
http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event
data gives a column density consistent with the Galactic value of 2.71
x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White
filter starting 85 seconds after the BAT trigger. No credible
afterglow candidate has been found in the initial data products. The
2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8'
region for the list of sources generated on-board covers 100% of the
XRT error circle. The list of sources is typically complete to about
18 mag. No correction has been made for the expected extinction
corresponding to E(B-V) of 0.26.
Burst Advocate for this burst is A. Melandri (andrea.melandri AT brera.inaf.it).
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
|
| GCN 18816 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18816 |
| Detection_method |
Swift Other |
| ra |
76.7961° |
| decl |
11.3237° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18816
SUBJECT: GRB 160104A: LCOGT-FTN afterglow candidate
DATE: 16/01/04 12:28:23 GMT
FROM: Cristiano Guidorzi at Ferrara U,Italy
C. Guidorzi (U. Ferrara), S. Dichiara (U. Ferrara, ICRANet), S.
Kobayashi (LJMU), A. Gomboc (U. Ljubljana) on behalf of a larger
collaboration report:
The 2-m LCOGT Faulkes Telescope North began observing Swift GRB 160104A
(Melandri et al. GCN 18815) on January 04, 11:50:08 UT (26 minutes after
the burst trigger) with SDSS R and I filters. Within the XRT error
circle we detect an uncatalogued source at the following position:
RA(J2000)= 05:07:11.058
DEC(J2000)= +11:19:25.4
with R~19 mag as calibrated against nearby USNOB-1 stars.
|
| GCN 18817 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18817 |
| Detection_method |
MITSuME |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18817
SUBJECT: GRB 160104A: MITSuME Akeno Optical Observation
DATE: 16/01/04 12:28:39 GMT
FROM: Taketoshi Yoshii at Tokyo Tech
Y.Saito, T.Fujiwara, T. Yoshii, Y. Tano, Y. Tachibana,
Y.Ono, S.Harita, Y.Muraki, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 160104A (A. Melandri et al., GCN
Circular #18815) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm
telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 2016-01-04 11:24:56 UT (46 sec after the burst) and
we detected the optical counterpart in Rc and Ic band.
The measured magnitudes were listed as follows.
We obtained following limits for the magnitudes.
T0+[sec] MID-UT T-EXP[sec] g' Rc Ic
-------------------------------------------------------------------------------------------------------
61 11:25:11 30 > 18.5 17.9 +/- 0.3 16.5 +/- 0.2
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.
|
| GCN 18819 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18819 |
| Detection_method |
MITSuME |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18819
SUBJECT: GRB 160104A: MITSuME Okayama Ks-band upper-limit
DATE: 16/01/04 14:10:03 GMT
FROM: Kenshi Yanagisawa at OAO/NAOJ
K. Yanagisawa, D. Kuroda, Y. Shimizu, H. Izumiura(OAO/NAOJ),
M. Yoshida (Hiroshima), K. Ohta(Kyoto) and N. Kawai(Tokyo Tech.)
report on behalf of the MITSuME collaboration:
We observed the field of GRB 160104A (Melandri et al., GCN 18815)
in Ks-band with a wide-field near infrared imager at Okayama
Astrophysical Observatory (Japan). The imager has effective
aperture of 0.91 m.
Observations started from 11:46 UT on 4th January, 0.38h after
the BAT trigger, to 12:49 UT. The total exposure of 24.0 min
was successfully obtained.
In our co-add image, we did not find any new point source within
the XRT error circle down to the limiting magnitude of
Ks=16.8 (Vega, S/N=3). The photometric calibration was made
against 2MASS field stars.
T0+[sec] MID-UT T-EXP[sec] Ks
---------------------------------------------------
+3,235 12:18 1440.0 >16.8
---------------------------------------------------
T0+ : Elapsed time after the burt [sec]
T-EXP: Total Exposure time [sec]
|
| GCN 18820 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18820 |
| Detection_method |
MITSuME |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18820
SUBJECT: GRB 160104A: MASTER early OT detection
DATE: 16/01/04 14:18:39 GMT
FROM: Vladimir Lipunov at Moscow State U/Krylov Obs
V.Yurkov, Yu.Sergienko, A.Gabovich, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk
O. Gress, K. Ivanov, N.M. Budnev, V.A. Poleshchuk, S.A. Yazev
Irkutsk State University
V. Lipunov, E. Gorbovskoy, N.Tyurina, D. Vlasenko, V.Kornilov,
P.Balanutsa, A.Kuznetsov, D. Vlasenko
Lomonosov Moscow State University, Sternberg Astronomical Institute
R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias
report on behalf of the MASTER Team:
MASTER-Amur robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Blagoveschensk was pointed to the GRB160104A (Melandri et
al., GCN 18815) 10 sec after notice time and 32 sec after trigger time
at 2016-01-04 11:24:46 UT. On our first (10s exposure) set we have
found optical transient with 17.0+/-0.3 unfiltered magnitude at LCOGT-FTN
and
MITSuME Akeno position (Guidorzi et al., GCN 18816; Saito et al., GCN 18817)
The 5-sigma upper limit has been about 17.3 mag
MASTER-Tunka robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located near Bykal lake was pointed to the GRB160104A 66 sec after
trigger time at 2016-01-04 11:25:20 UT. On our first (10s exposure) set
we have found marginally optical transient ~17 unfiltered magnitude.
The 5-sigma upper limit has been about 17.2mag
The reduction is continuated.
The message may be cited.
|
| GCN 18821 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18821 |
| Detection_method |
Swift-XRT Det |
| ra |
76.7960° |
| decl |
11.3239° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18821
SUBJECT: GRB 160104A: Enhanced Swift-XRT position
DATE: 16/01/04 16:01:09 GMT
FROM: Phil Evans at U of Leicester
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)
report on behalf of the Swift-XRT team.
Using 1777 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 160104A, we find an astrometrically corrected X-ray
position (using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue): RA, Dec = 76.79604, +11.32393 which is equivalent
to:
RA (J2000): 05h 07m 11.05s
Dec (J2000): +11d 19' 26.2"
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest
position can be viewed at http://www.swift.ac.uk/xrt_positions. Position
enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans
et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the
Swift-XRT team.
|
| GCN 18823 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18823 |
| Detection_method |
Optical |
| ra |
76.7833° |
| decl |
11.0339° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18823
SUBJECT: GRB 160104A: Xinglong TNT optical observation
DATE: 16/01/04 16:27:58 GMT
FROM: L.P. Xin at NAOC
L. P. Xin, X. F. Wang, J. Y. Wei, Y. L. Qiu, J. S. Deng,
J. Wang, X. H. Han, C. Wu, D. Xu on behalf of EAFON report:
We observed GRB 160104A (Melandri et al. GCN 18815) with
Xinglong 0.8-m TNT telescope at 11: 26:01UT, 111 sec after the burst.
The optical afterglow (Guidorzi et al., GCN 18816; Saito GCN 18817;
Yurkov et al., GCN 18820 ) was detected in our white images.
The brightness of the optical afterglow is about 18.45 mag
at the mid time of 121 sec afer the burst,
calibrated by the USNO B1.0 star (RA=05:07:08 DEC=11:02:02 R2=16.25mag).
The message may be cited.
|
| GCN 18825 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18825 |
| Detection_method |
MITSuME |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18825
SUBJECT: GRB 160104A: MITSuME Okayama upper limits
DATE: 16/01/05 00:07:57 GMT
FROM: Daisuke Kuroda at OAO/NAOJ
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ),
S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto)
and N. Kawai(Tokyo Tech)
report on behalf of MITSuME and OISTER collaboration:
We observed the field of GRB 160104A (Melandri et al., GCNC 18815)
with the optical three color (g', Rc and Ic) CCD camera attached
to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2016-01-04 12:42:48 UT (~1.3 h after
the burst). We could not detect the previously reported afterglow
(Guidorzi et al., GCNC 18816; Saito et al., GCNC 18817)
in all the three bands.
Three sigma upper limits of the OT are listed below.
We used GSC2.3 catalog for flux calibration.
#T0+[day] MID-UT T-EXP[sec] g' Rc Ic
-----------------------------------------------------
0.08648 13:28:43 4620.0 >20.4 >20.0 >19.4
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
|
| GCN 18826 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18826 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18826
SUBJECT: GRB 160104A: GWAC upper limit during prompt emission phase
DATE: 16/01/05 03:05:45 GMT
FROM: L.P. Xin at NAOC
L. P. Xin, J. Y. Wei， Y. L. Qiu, E. W. Liang, X. H. Han,
Y. Xu, L. Huang, Y. G. Yang, X. M. Meng, H. B. Cai,
J. Wang, C. Wu, J. S. Deng and H. L. Li report:
The field of SWIFT GRB 160104A (Melandri et al. GCN 18815)
was monitored by Mini-GWAC system continuously
during about 1.5 hrs before and 1 hrs after the burst trigger time.
The exposure time for each frame is 10 sec.
No any new optical counterpart (Guidorzi et al., GCN 18816;
Saito GCN 18817; Xin et al., GCN 18823) in single frame
was detected down to the 5 sigma upper limit of 12.3 mag
during our observations, calibrated by nearby USNO B1.0 R2 mag,
at the epoch of prompt emission phase.
Combining 5 frames during and after the burst trigger initially with a total
exposure time of 50 sec gives a 5 sigma upper limit of 12.8 mag.
Mini-GWAC system is located at Xinglong observatory,
National Astronomical Observatories, China,
including 6 mounts and 12 Canon 85/f1.2 cameras.
Each mount is equipped with 2 cameras.
For each camera, the Apogee U9000X CCD was used, which gives
about 400 square degree of FOV. The total field of view of this system
is about 5000 sq.deg.
This message may be cited.
|
| GCN 18827 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18827 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18827
SUBJECT: GRB 160104A: Mini-GWAC upper limit during prompt emission phase
DATE: 16/01/05 03:09:08 GMT
FROM: L.P. Xin at NAOC
L. P. Xin, J. Y. Wei, Y. L. Qiu, E. W. Liang, X. H. Han,
Y. Xu, L. Huang, Y. G. Yang, X. M. Meng, H. B. Cai,
J. Wang, C. Wu, J. S. Deng and H. L. Li report:
The field of SWIFT GRB 160104A (Melandri et al. GCN 18815)
was monitored by Mini-GWAC system continuously
during about 1.5 hrs before and 1 hrs after the burst trigger time.
The exposure time for each frame is 10 sec.
No any new optical counterpart (Guidorzi et al., GCN 18816;
Saito GCN 18817; Xin et al., GCN 18823) in single frame
was detected down to the 5 sigma upper limit of 12.3 mag
during our observations, calibrated by nearby USNO B1.0 R2 mag,
at the epoch of prompt emission phase.
Combining 5 frames during and after the burst trigger initially with a total
exposure time of 50 sec gives a 5 sigma upper limit of 12.8 mag.
Mini-GWAC system is located at Xinglong observatory,
National Astronomical Observatories, China,
including 6 mounts and 12 Canon 85/f1.2 cameras.
Each mount is equipped with 2 cameras.
For each camera, the Apogee U9000X CCD was used, which gives
about 400 square degree of FOV. The total field of view of this system
is about 5000 sq.deg.
This message may be cited.
|
| GCN 18828 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18828 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
11:24:13.220 UTC |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18828
SUBJECT: GRB 160104A: Fermi GBM observation
DATE: 16/01/05 03:25:03 GMT
FROM: Eric Burns at U of Alabama
R. Hamburg (UAH) and Hoi-Fung Yu (MPE)
report on behalf of the Fermi GBM Team:
"At 11:24:13.22 UT on 04 January 2016, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 160104A (trigger 473599457 / 160104475), which
was also detected by the Swift/BAT (A. Melandri et al. 2016, GCN 18815).
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 104
degrees.
The GBM light curve consists of one main peak
with a duration (T90) of about 10 s (50-300 keV).
The time-averaged spectrum from T0-3.200 s to T0+0.128 s is
adequately fit by a simple power law function with index -1.7 +/- 0.1.
The event fluence (10-1000 keV) in this time interval is
(6.1 +/- 0.7)E-07 erg/cm^2. The 1-sec peak photon flux measured
starting from T0-1.92 s in the 10-1000 keV band
is 1.7 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|
| GCN 18829 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18829 |
| Detection_method |
Swift-BAT Det |
| ra |
76.8080° |
| decl |
11.3340° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18829
SUBJECT: GRB 160104A: Swift-BAT refined analysis
DATE: 16/01/05 03:51:09 GMT
FROM: Tilan Ukwatta at LANL
D. M. Palmer (LANL), S. D. Barthelmy (GSFC),
J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC),
C. B. Markwardt (GSFC), A. Melandri (INAF-OAB),
T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent
telemetry downlink, we report further analysis of BAT
GRB 160104A (trigger #669319) (Melandri , et al., GCN
Circ. 18815). The BAT ground-calculated position is
RA, Dec = 76.808, 11.334 deg which is
RA(J2000) = 05h 07m 13.9s
Dec(J2000) = +11d 20' 01.2"
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90%
containment). The partial coding was 100%.
The mask-weighted light curve shows a two-peak episode
with main peak starting ~T-3 sec, peaking at ~T+1 sec,
and ending around T+10 sec, where second weak
peak starts. The second pulse ends around ~T+20 sec.
T90 (15-350 keV) is 16.2 +- 2.5 sec (estimated
error including systematics).
The time-averaged spectrum from T-1.31 to T+17.65 sec is best
fit by a simple power-law model. The power law index of the
time-averaged spectrum is 1.76 +- 0.19. The fluence in the
15-150 keV band is 4.0 +- 0.5 x 10^-07 erg/cm2. The 1-sec peak
photon flux measured from T-0.16 sec in the 15-150 keV band
is 1.0 +- 0.2 ph/cm2/sec. All the quoted errors are at the
90% confidence level.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/669319/BA/
|
| GCN 18830 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18830 |
| Detection_method |
Swift-XRT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18830
SUBJECT: GRB 160104A: Swift-XRT refined Analysis
DATE: 16/01/05 11:45:04 GMT
FROM: Andrea Melandri at INAF-OAB
A. Melandri, P. D'Avanzo (INAF-OAB) and P.A. Evans (U. Leicester)
report on behalf of the Swift-XRT team:
We have analysed 7.5 ks of XRT data for GRB 160104A (Melandri et al.
GCN Circ. 18815), from 63 s to 36.3 ks after the BAT trigger. The data
comprise 914 s in Windowed Timing (WT) mode (the first 9 s were taken
while Swift was slewing) with the remainder in Photon Counting (PC)
mode. The enhanced XRT position for this burst was given by Beardmore
et al. (GCN Circ. 18821).
The light curve can be modelled with an initial power-law decay with an
index of alpha=3.1 +/- 0.4, followed by a break at T+269 s to an alpha
of 0.53 (+0.14, -0.17). Flaring activity is observed between T0+200 s
and T0+2.0 ks.
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.95 (+0.18, -0.08). The
best-fitting absorption column is consistent with the Galactic value
of 2.7 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed
(unabsorbed) 0.3-10 keV flux conversion factor deduced from this
spectrum is 3.7 x 10^-11 (5.2 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 2.7 (+/-0.6) x 10^21 cm^-2
Galactic foreground: 2.7 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index: 1.95 (+0.18, -0.08)
If the light curve continues to decay with a power-law decay index of
0.53, the count rate at T+24 hours will be 0.01 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.7 x
10^-13 (5.2 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00669319.
This circular is an official product of the Swift-XRT team.
|
| GCN 18831 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18831 |
| Detection_method |
Other |
| redshift |
2.8000 |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18831
SUBJECT: GRB 160104A: Spectroscopic observations from 10.4m GTC
DATE: 16/01/05 12:09:05 GMT
FROM: Antonio de Ugarte Postigo at IAA-CSIC
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), C.C. Thoene (IAA-CSIC),
J.P.U. Fynbo (DARK/NBI), N.R. Tanvir (U. Leicester), R. Sanchez-Ramirez
(IAA-CSIC) and S. Geier (GRANTECAN), report on behalf of a larger collaboration:
We observed the afterglow of GRB 160104A (Melandri et al. GCN18815,
Guidorzi et al. GCN18816) with OSIRIS on the 10.4 m GTC telescope, located
at the Roque de los Muchachos Observatory (La Palma, Spain). Observations
started at 20:25 UT (9.0 hr after the GRB onset) and consisted of a 40 s
acquisition image in i-band as well as 3x900s spectra using the R1000R grism which
covers the range between 5100 and 10000 AA with a resolution of R~800.
The acquisition image was obtained under good conditions with a seeing of 0.8".
The afterglow is clearly detected although it shows a strong decay in brightness
with respect to previous detections (Guidorzi et al. GCN18816, Saito et al. GCN
18817, Yurkov et al. GCN 18820, Xin et al. 18823). As compared to USNO-B1.0
stars we measure a magnitude of i(Vega)=22.6, roughly equivalent to i(AB)=23.0.
The combined spectrum shows a clear continuum over the complete range
with only one prominent absorption feature centred at 5889 AA, with an
equivalent width of ~30 AA. There are also tentative absorptions features
at ~5300 and ~5340 AA. There is no drop bluewards of the 5889 AA feature
which could otherwise be suggestive of a weak Ly-alpha at z=3.84. At a
redshift of 2.80, the features could be consistent with CIV and the two SiIV,
respectively. We are not able to establish a convincing solution for the redshift
based on this evidence.
|
| GCN 18833 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18833 |
| Detection_method |
Swift-XRT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18833
SUBJECT: GRB 160104A: Nishi-Harima MINT Observations
DATE: 16/01/06 04:49:49 GMT
FROM: Tomohito Ohshima at Nishi-Harima Obs
GRB 160104A: Nishi-Harima MINT Observations
K. Morihana. J. Takahashi, Y. Takagi, S. Honda, T. Ohshima, and Y. Itoh
(Univ. of Hyogo), report on behalf of Nayuta team and OISTER collaboration:
We observed the field of GRB 160104A (Melandri et al. GCN 18815)
with Multiband Imager for Nayuta Telescope (MINT) attached to the Nayuta 2-m
telescope at the Nishi-Harima Astronomical Observatory.
The observations were started at 12:01 UT on 2016-01-4 (~35 minuets
after the burst).
We detected the optical afterglow in Rc band within the error circle of
Swift/XRT.
Photometric results of our observations are shown below.
We used nearby NOMAD catalogue stars for the photometric calibration.
# MID-UT Tmid-T0 T-EXP Rc_mag
----------------------------------------------------------------------
12:37:32 0.0509 4200s 21.6+/-0.5
----------------------------------------------------------------------
Tmid-T0: Elapsed time after the burst (day)
T-EXP: Total Exposure time (seconds)
|
| GCN 18841 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18841 |
| Detection_method |
MITSuME |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18841
SUBJECT: GRB 160104A: Continued MITSuME Akeno Optical Observation
DATE: 16/01/08 06:41:52 GMT
FROM: Taketoshi Yoshii at Tokyo Tech
T.Fujiwara, Y.Saito, T. Yoshii, Y. Yano, Y. Tachibana,
Y.Ono, S.Harita, Y.Muraki, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 160104A (A. Melandri et al., GCN
Circular #18815) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm
telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 2016-01-04 11:24:56 UT (46 sec after the burst) and
we detected the optical counterpart in Rc and Ic band.
The measured magnitudes were listed as follows.
We obtained following results for the magnitudes.
T0+[sec] MID-UT T-EXP[sec] g' Rc Ic
-------------------------------------------------------------------------------------------------------
382 11:38:50 900 > 20.6 18.9 +/- 0.1 18.3 +/- 0.2
13473 16:03:30 5880 > 21.3 20.2 +/- 0.2 19.5 +/- 0.3
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.
|
| GCN 18856 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18856 |
| Detection_method |
Swift-UVOT Det |
| ra |
76.7960° |
| decl |
11.3238° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18856
SUBJECT: GRB 160104A: Swift/UVOT Detection
DATE: 16/01/12 22:20:40 GMT
FROM: Frank Marshall at GSFC
F.E. Marshall (NASA/GSFC) and A. Melandri (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160104A
85 s after the BAT trigger (Melandri et al., GCN Circ. 18815).
A fading source consistent with the XRT position (Beardmore et al. GCN Circ. 18821)
and the optical afterglow position (Guidorzi et al. GCN Circ. 18816)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 05:07:11.05 = 76.79603 (deg.)
Dec (J2000) = 11:19:25.5 = 11.32375 (deg.)
with an estimated uncertainty of 0.64 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 85 235 141 20.48 +/- 0.22
white 1180 1893 94 >20.5
v 627 1252 78 18.92 +/- 0.32
b 553 1869 136 >19.8
u 297 1843 363 >20.5
w1 677 1819 136 >20.1
m2 825 5587 203 >20.1
w2 602 5249 333 >20.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.26 in the direction of the burst
(Schlegel et al. 1998).
|
| GCN 18890 table |
|---|
| GRB_name |
GRB160104A |
| GCN_number |
18890 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18890
SUBJECT: GRB 160104A: ISON-Ussuriysk optical observations
DATE: 16/01/18 21:20:20 GMT
FROM: Alexei Pozanenko at IKI, Moscow
E. Mazaeva (IKI), E. Chornaya (UAFO), A. Matkin (UAFO, ISON), A.
Volnova (IKI), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We observed the field of the GRB 160104A (Melandri et al., GCN 18815)
with SANTEL-650 (0.65m) telescope of UAFO/ISON-Ussuriysk observatory
starting on 2016-01-04 (UT) 12:21:43. We obtained 60 unfiltered images
of 60 s exposure. We clearly detect optical afterglow (Guidorzi et al.,
GCN 18816) and preliminary photometry of a combined image is following
Date UT start t-T0 Filter Exp. OT OT_err U_limit (3sigma)
(mid, days) (s)
2016-01-04 12:21:43 0.0635 none 59*60 20.45 0.12 22.3
The photometry is based on nearby USNO-B1.0 stars:
USNO-B1.0_id R2
1013-0049708 15.14
1013-0049721 14.90
1013-0049703 16.30
1013-0049714 17.12
We also note the presence of a source 11" South-East of m = 20.60 +/-
0.15.
|