GRB 120119A
GCN Circular 12859
Subject
GRB 120119A: Swift detection of a burst with an optical counterpart
Date
2012-01-19T04:22:23Z (13 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@milkyway.gsfc.nasa.gov>
A. P. Beardmore (U Leicester), S. D. Barthelmy (GSFC),
M. M. Chester (PSU), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU),
H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL),
O. M. Littlejohns (U Leicester), F. E. Marshall (NASA/GSFC),
K. L. Page (U Leicester), M. H. Siegel (PSU), C. A. Swenson (PSU) and
T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 04:04:30.21 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 120119A (trigger=512035). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 120.027, -9.074, which is
RA(J2000) = 08h 00m 07s
Dec(J2000) = -09d 04' 25"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows at least three peaks
with a total duration of at least 50 sec. The peak count rate
was ~16,000 counts/sec (15-350 keV), at ~10 sec after the trigger.
The XRT began observing the field at 04:05:23.4 UT, 53.3 seconds after
the BAT trigger. XRT found a bright, uncatalogued X-ray source located
at RA, Dec 120.0293, -9.0803 which is equivalent to:
RA(J2000) = +08h 00m 7.03s
Dec(J2000) = -09d 04' 49.1"
with an uncertainty of 4.7 arcseconds (radius, 90% containment). This
location is 24 arcseconds from the BAT onboard position, within the BAT
error circle. No event data are yet available to determine the column
density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 1.06e-08 erg cm^-2 s^-1 (0.2-10
keV).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 61 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 08:00:06.94 = 120.02890
DEC(J2000) = -09:04:53.7 = -9.08157
with a 90%-confidence error radius of about 0.66 arc sec. This position is 4.8
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.67 with a 1-sigma error of about 0.16. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.11.
Burst Advocate for this burst is A. P. Beardmore (apb AT star.le.ac.uk).
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 Circular 12860
Subject
GRB 120119A: PAIRITEL NIR Detection
Date
2012-01-19T04:42:48Z (13 years ago)
From
Adam Morgan at U.C. Berkeley <qmorgan@gmail.com>
A. N. Morgan, and J. S. Bloom (UC Berkeley) report:
We observed the field of GRB 120119A (Beardmore et al., GCN 12859) with the
1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at
2012-Jan-19 04h05m23s UT, ~53 seconds after the Swift trigger. In
mosaics (effective exposure time of 560 seconds) taken simultaneously in
the J, H, and Ks filters, we detect a source at the position of the optical
afterglow.
The preliminary photometry yields:
post burst
t_mid (m) exp.(s) filt mag m_err
10.3 560 J 14.35 0.02
10.3 560 H 13.10 0.02
10.3 560 Ks 11.95 0.02
All magnitudes are given in the Vega system, calibrated to 2MASS. No
correction for Galactic extinction has been made to the above reported
values. Observations are continuing.
[GCN OPS NOTE(19jan11): Per author's request, the start time in the 3rd line
was changed from "04h07m15s UT, ~2.7 minutes" to "04h05m23s UT, ~53 seconds".]
GCN Circular 12861
Subject
GRB 120119A: Liverpool Telescope afterglow detection
Date
2012-01-19T04:51:56Z (13 years ago)
From
Andreja Gomboc at LT,ARI,Liverpool JMU <ag@astro.livjm.ac.uk>
A. Gomboc (University of Ljubljana, CE Space.si) reports on behalf of a large collaboration:
The 2-m Liverpool Telescope responded automatically to Swift trigger 512035. Following observations with RINGO-2 polarimeter, observations in r' i' and z' filter started at 14.5 min after the BAT trigger time. We clearly detect the afterglow in all three filters consistent with the UVOT position (Beardmore et al. GCN Circ. 12859).
GCN Circular 12863
Subject
GRB 120119A: GROND Detection of the Optical/NIR Afterglow
Date
2012-01-19T05:27:34Z (13 years ago)
From
Patricia Schady at MPE/Swift <pschady@mpe.mpg.de>
P. Schady, V. Sudilovsky, J. Greiner (all MPE Garching) and T.Kruehler
(DARK/NBI) report on behalf of the GROND team:
We observed the field of GRB 120119A (Swift trigger 512035; Beardmore
et al., GCN #12859) simultaneously in g'r'i'z'JHK with GROND (Greiner
et al. 2008, PASP 120, 405) mounted at the 2.2 m MPI/ESO telescope at
La Silla Observatory (Chile).
Observations started at 04:08 UT, 3.5 min after the GRB trigger, and
are continuing. They were performed at an average seeing of 0.9" and
at an average airmass of 1.0.
We found a single point source consistent with the UVOT afterglow
position.
Based on the first 2.4 min of total exposures in g'r'i'z' and 4 min in
JHK, we estimate preliminary magnitudes (all in AB) of
g' = 18.8 +- 0.1 mag,
r' = 17.7 +- 0.1 mag,
i' = 16.8 +- 0.1 mag,
z' = 16.2 +- 0.1 mag,
J = 15.2 +- 0.1 mag,
H = 14.6 +- 0.1 mag and
K = 14.0 +- 0.1mag
Given magnitudes are calibrated against SDSS zeropoints as well as
2MASS field stars and are not corrected for the expected Galactic
foreground extinction corresponding to a reddening of E_(B-V)=0.11 mag
in the direction of the burst (Schlegel et al. 1998).
GCN Circular 12864
Subject
GRB 120119A: PROMPT optical observation of early afterglow
Date
2012-01-19T05:29:06Z (13 years ago)
From
Aaron LaCluyze at U.North Carolina <lacluyze@email.unc.edu>
A. LaCluyze, J. Haislip, K. Ivarsen, D. Reichart, J. Moore, M. Nysewander,
A. Trotter, R. Egger, A. Foster, A. Oza, T. Cromartie, E. Speckhard, and J.
A. Crain report:
Skynet observed the field of GRB 120119A with the PROMPT telescopes located
at CTIO in Chile. Observations in B, R, and I began at 04:05:08 UT, 38
seconds after the burst. We detect an optical source consistent with the
UVOT position reported by Beardmore et. al. (GCN 12859) in all three
filters. �The optical afterglow faded for the first ~2.3 minutes, then
brightened until approximately minute 14, after which it resumed fading.
The afterglow is red, with (I - R) ~ 1 mag and (R - B) ~ 2 mag. �
A preliminary light curve can be found at:
http://skynet.unc.edu/grb/grb120119a.png
Further observations are ongoing.
GCN Circular 12865
Subject
GRB 120119A: Gemini-S redshift
Date
2012-01-19T06:01:56Z (13 years ago)
From
Antonino Cucchiara at UCSC/UCO Lick <acucchia@ucolick.org>
A. Cucchiara, J. X. Prochaska (UCSC/UCO Lick)
report on behalf of a larger collaboration:
On January 19.20 UT (53 minutes after the BAT trigger)
we observed the optical counterpart of GRB 120119A
(Beardmore et al., GCN 12859) using GMOS-South on the
Gemini-South 8-m telescope.
Spectroscopic observation covering 4000-8000 Angstrom wavelength
range reveals several absorption features, including AlIII1854,
1862, FeII2586,2600, MnII2606, MgII2796,2803 at a common
redshift of 1.728.
Also at least an intervening system is present at z=1.212
based on strong MgII2796 absorption features.
We therefore suggest this to be the redshift of GRB 120119A.
We thank the Gemini staff for performing this observation.
GCN Circular 12866
Subject
GRB 120119A: Lick 3m Spectroscopy
Date
2012-01-19T06:23:08Z (13 years ago)
From
Antonino Cucchiara at UCSC/UCO Lick <acucchia@ucolick.org>
Anna Pancoast (UCSB), Rebecca Rosen (Cal Poly), Vardha Bennert
(Cal Poly), A. Cucchiara (UCO) and J. Xavier Prochaska (UCO)
on behalf of GRAASP report:
"We observed the afterglow of GRB 120119 with the Kast
dual spectrometer for 1800s total starting at UT 05:30
under fine conditions. Analysis of the red side exposure
shows strong absorption from ZnII and FeII transitions
at a common redshift of z=1.73 confirming the reported
redshift of Cucciara & Prochaska (GCN 12865).
Further analysis is in progress.
This GCN may be cited.
GCN Circular 12867
Subject
GRB 120119A: MMT redshift confirmation
Date
2012-01-19T06:24:14Z (13 years ago)
From
Edo Berger at Harvard <eberger@cfa.harvard.edu>
D. Milisavljevic, M. Drout, and E. Berger (Harvard) report:
"We obtained an optical spectrum of GRB 120119A (GCN 12859) with the
Blue Channel spectrograph mounted on the MMT 6.5-m telescope. In a
single 1800 sec exposure covering 3500-8500 Ang we find a wide range
of absorption features (from CII1335 to MgI2853) at a common redshift
of z=1.728, confirming the results of Cucchiara & Prochaska (GCN
12865)."
GCN Circular 12871
Subject
GRB 120119A: optical observations
Date
2012-01-19T12:57:41Z (13 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
L. Elenin (KIAM), A. Volnova (SAI MSU), A. Pozanenko (IKI) report on
behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 120119A (Beardmore et al., GCN
12859) with 0.45-m telescope ISON-NM observatory on Jan. 19. We took
several unfiltered images of 60 s exposure on Jan.19, starting (UT)
05:19:52. We clearly detect the OT source (Beardmore et al., GCN 12859).
Coordinates of the source are (J2000) 08 00 06.96 -09 04 54.4 which is
consistent with UVOT position (GCN 12859). Photometry of the source is
based on SDSS star J080000.59-090624.3 (08:00:00.60 -09:06:24.4) assuming
R=16.42:
t-t0 filter Exp. OT
(mid, days) (s)
0.05234 none 600 18.97 +/- 0.09
0.06039 none 600 18.84 +/- 0.08
0.06837 none 600 19.13 +/- 0.11
0.08321 none 1500 19.51 +/- 0.07
0.10178 none 1500 19.70 +/- 0.08
0.12128 none 1500 19.99 +/- 0.08
0.13989 none 1500 19.86 +/- 0.08
Looking for the photometry result one can suggest either plateau phase or
the start of a re-brightening episode at ~ 0.14d.
GCN Circular 12872
Subject
Konus-Wind observation of GRB 120119A
Date
2012-01-19T13:18:14Z (13 years ago)
From
Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin,
P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf
of the Konus-Wind team, report:
The long GRB 120119A (Swift-BAT trigger #512035:
Beardmore et al., GCN 12859)
triggered Konus-Wind at T0=14674.872s UT (04:01:34.872)
The burst light curve shows a multi-peaked pulse
with a total duration of ~61 s.
The emission is seen up to ~7 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB120119_T14674/
As observed by Konus-Wind the burst
had a fluence of (4.7 � 0.6)x10-5 erg/cm2,
and a 256-ms peak flux, measured from T0+16.384 s,
of (3.9 � 0.5)x10-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst
(measured from T0 to T0+49.152 s)
is best fitted in the 20 keV - 10 MeV range
with the GRB (Band) model, for which:
the low-energy photon index alpha = -0.85 (-0.16, +0.20),
the high energy photon index beta = -2.34 (-0.22, +0.15),
the peak energy Ep = 153(-19, +21) keV,
chi2 = 73.5/84 dof.
The spectrum of the initial pulse
(measured from T0 to T0+16.384 s) is best fitted
is best fitted in the 20 keV - 10 MeV range
with the GRB (Band) model, for which:
the low-energy photon index alpha = -0.92 (-0.13, +0.14),
the high energy photon index beta = -2.41 (-0.35, +0.16),
the peak energy Ep = 192(-21, +29) keV,
chi2 = 72.4/84 dof.
Assuming the redshift z=1.73 (Cucchiara & Prochaska, GCN 12865;
Pancoast et al., GCN 12866; Milisavljevic et al., GCN 12867)
and a standard cosmology model
with H_0 = 71 km/s/Mpc, Omega_M = 0.27, Omega_Lambda = 0.73,
the isotropic energy release E_iso is (3.6 � 0.5)x10^53 erg,
the isotropic peak luminosity L_iso_max is (5.1 � 0.7)x10^52 erg/s,
and Ep_rest is (265 � 35) keV.
All the quoted results are preliminary.
All the quoted errors are at the 90% confidence level.
GCN Circular 12874
Subject
GRB 120119A: Fermi GBM observation
Date
2012-01-19T15:24:03Z (13 years ago)
From
David Gruber at MPE <dgruber@mpe.mpg.de>
David Gruber (MPE) reports on behalf of the Fermi GBM Team:
"At 04:04:25.06 UT on 19 January 2012, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 120119A (trigger 348638667 / 120119170).
which was also detected by the Swift/BAT and Swift/XRT
(Beardmore et al. 2012, GCN 12859)
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 31.4 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve shows several overlapping pulses
with a duration (T90) of about 55 s (50-300 keV).
The time-averaged spectrum from T0-1.5 s to T0+53.8 s is
best fit by a Band function with Epeak = 189.2 +/- 8.3 keV,
alpha = -0.98 +/- 0.03, and beta = -2.36 +/- 0.09.
The event fluence (10-1000 keV) in this time interval is
(3.87 +/- 0.01)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+14.5 s in the 10-1000 keV band
is 16.86 +/- 0.39 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
GCN Circular 12876
Subject
GRB 120119A: Enhanced Swift-XRT position
Date
2012-01-19T17:52:23Z (13 years ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)
report on behalf of the Swift-XRT team.
Using 6070 s of XRT Photon Counting mode data and 12 UVOT
images for GRB 120119A, 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 = 120.02875, -9.08177 which is equivalent
to:
RA (J2000): 08h 00m 6.90s
Dec (J2000): -09d 04' 54.4"
with an uncertainty of 1.4 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 Circular 12877
Subject
GRB 120119A: Swift-XRT refined Analysis
Date
2012-01-19T18:22:07Z (13 years ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
V. D'Elia (ASDC), V. Mangano (INAF-IASFPA), M.C. Stroh (PSU), D.N.
Burrows (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester), C. Pagani
(U. Leicester), A. Melandri (INAF-OAB) and A.P. Beardmore report on
behalf of the Swift-XRT team:
We have analysed 9.1 ks of XRT data for GRB 120119A (Beardmore et al.
GCN Circ. 12859), from 59 s to 30.4 ks after the BAT trigger. The data
comprise 332 s in Windowed Timing (WT) mode with the remainder in
Photon Counting (PC) mode. The enhanced XRT position for this burst was
given by Beardmore et al. (GCN. Circ 12876).
The light curve can be modelled with an initial power-law decay with an
index of alpha=2.58 (+/-0.08), followed by a break at T+167 s to an
alpha of 1.008 (+0.017, -0.018).
A spectrum formed from the WT mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.93 (+/-0.07). The
best-fitting absorption column is 2.18 (+0.22, -0.21) x 10^21 cm^-2,
in excess of the Galactic value of 7.9 x 10^20 cm^-2 (Kalberla et al.
2005). The PC mode spectrum has a photon index of 1.68 (+0.13, -0.12)
and a best-fitting absorption column of 2.1 (+0.5, -0.4) x 10^21 cm^-2.
The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor
deduced from this spectrum is 4.7 x 10^-11 (6.0 x 10^-11) erg cm^-2
count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 2.1 (+0.5, -0.4) x 10^21 cm^-2
Galactic foreground: 7.9 x 10^20 cm^-2
Excess significance: 4.9 sigma
Photon index: 1.68 (+0.13, -0.12)
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00512035.
This circular is an official product of the Swift-XRT team.
GCN Circular 12878
Subject
GRB 120119A: SMARTS optical/IR afterglow observations
Date
2012-01-19T19:46:55Z (13 years ago)
From
Bethany Cobb at GWU <bcobb@gwu.edu>
B. E. Cobb (GWU), reports:
Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained
optical/IR imaging of the error region of GRB 120119A (GCN 12859,
Beardmore et al.) over several epochs, starting ~0.6 hours post-burst.
For the first epoch, several dithered images were obtained in each filter,
with total summed exposure times of 180s in each of BRIJK and 120s in each
of H and V. For later epochs, total summed exposure times amounted to 15
minutes in I and V and 12 minutes in J and K.
At a mid-exposure time of 2012-01-19 04:43 UT (0.64 hrs post-burst), the
GRB afterglow (e.g. GCN 12859, Beardmore et al., GCN 12860, Morgan et
al., GCN 12863, Schady et al.) is detected with the following magnitudes:
B = 20.07 +/- 0.06
V = 18.91 +/- 0.05
R = 18.02 +/- 0.03
I = 16.96 +/- 0.03
J = 15.14 +/- 0.05
H = 14.02 +/- 0.06
K = 12.89 +/- 0.10
Between about 0.6 hrs and 3 hrs post-burst, the GRB afterglow fades with a
decay rate of approximately alpha = 1.6 (where afterglow flux is
proportional to t^-alpha).
time
post-burst I-band magnitude
0.64 hrs 16.96 +/- 0.03
1.71 hrs 18.52 +/- 0.03
2.97 hrs 19.39 +/- 0.05
(Optical photometry is calibrated against Landolt standard stars
and IR photometry is calibrated against 2MASS stars in the field.)
GCN Circular 12880
Subject
GRB 120119A: Swift/UVOT Observations
Date
2012-01-19T20:29:33Z (13 years ago)
From
Margaret Chester at PSU <chester@astro.psu.edu>
M. M. Chester (PSU) and A. P. Beardmore (U Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120119A
62 s after the BAT trigger (Beardmore et al., GCN Circ. 12859).
A source consistent with the XRT position (Beardmore et al., GCN Circ.
12876) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 08:00:06.93 = 120.02889 (deg.)
Dec (J2000) = -09:04:53.7 = -9.08159 (deg.)
with an estimated uncertainty of 0.59 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)
are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 62 211 147 19.5 +/- 0.1
white 62 1997 205 19.5 +/- 0.1
white 6130 30955 1112 21.9 +/- 0.4
v 1682 2048 58 >19.1
v 7810 12009 926 >20.8
b 1608 1973 58 19.4 +/- 0.3
b 5926 30829 1967 >22.0
u_FC 273 302 28 >18.7
u 273 1948 66 >19.3
u 5720 29917 1967 >21.7
w1 1731 1923 39 >19.1
w1 12921 25179 1511 >21.5
m2 1706 2073 58 >19.3
m2 12014 12914 885 >21.2
w2 1658 2022 58 >19.5
w2 6336 7804 242 >20.6
The magnitudes in the table are not corrected for the Galactic
extinction
due to the reddening of E(B-V) = 0.11 in the direction of the burst
(Schlegel et al. 1998).
GCN Circular 12881
Subject
GRB 120119A: optical observations
Date
2012-01-20T09:20:57Z (13 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
L. Elenin (KIAM), A. Volnova (SAI MSU), A. Pozanenko (IKI) report on
behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 120119A (Beardmore et al., GCN
12859) with 0.45-m telescope ISON-NM observatory on Jan. 20 between (UT)
05:59:24 - 06:53:16. We do not detect the OT at the UVOT position reported
in GCN 12880 (Chester et al.).
However we detect the source with coordiantes (J2000) 08 00 06.97 -09 04
56.6 with uncertainties of 0.1" (in both coordinates) which is differ from
OT coordinates calculated in the first epoch of our observations (Elenin et
al, GCN 12871). This source coincide with SDSS source
SDSSJ080006.97-090456.8 (r=21.05) and is also visible at DSS2 image (R).
Photometry of this source at 1.0987 days after burst (mean time) is 21.1 +/-
0.2 and based on SDSS star J080005.86-090434.9 (J2000) 08 00 05.868 -09 04
34.91 assuming R=18.05.We suggest that the source could be a host galaxy of
GRB 120119A. All results are preliminary.
GCN Circular 12882
Subject
GRB120119A: REM NIR observations
Date
2012-01-20T09:36:12Z (13 years ago)
From
Dino Fugazza at INAF-OAB <dino.fugazza@brera.inaf.it>
D. Fugazza, P. D'Avanzo, A. Melandri (INAF-OAB), L. A. Antonelli (INAF-OAR/ASI-ASDC) report on behalf of the CIBO collaboration:
We observed the field of GRB 120119A (Beardmore et al., GCN 12859) with the REMIR infrared camera, mounted on the 60-cm robotic REM telescope at
La Silla, starting 2.5 min after the burst.
The optical/NIR afterglow (Beardmore et al. GCN 12859; Morgan & Bloom GCN 12860; Gomboc GCN 12861; Schady et al. GCN 12863; Elenin et al. GCN 12871; Cobb GCN 12878) is clearly detected in the H-band.
The light curve shows a plateau from about 4.5 min to 10 min after the burst with an observed magnitude of H~13.4, peaks at about T-T0=15 min with H~13.0 and then displays a significant decay.
The last detection is at T-T0=3.8 hr with a magnitude of H~16.0.
The magnitudes are calibrated against the 2MASS catalogue.
GCN Circular 12883
Subject
GRB 120119A: TAROT La Silla observatory optical observations
Date
2012-01-20T09:47:40Z (13 years ago)
From
Alain Klotz at CESR-CNRS <Alain.Klotz@free.fr>
Klotz A. (IRAP-CNRS-OMP), Gendre B. (ASDC/INAF-OAR),
Boer M. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report:
We imaged the field of GRB 120119A detected by SWIFT
(trigger 512035) with the TAROT robotic telescope (D=25cm)
located at the European Southern Observatory,
La Silla observatory, Chile.
The observations started 33.0s after the GRB trigger
(9.2s after the notice) using the trigger time origin
at 04:04:30.21 UT (Beardmore et al. GCNC 12859).
The elevation of the field increased from
67 degrees above horizon and weather conditions
were good. We observed during 4.35h until the
dawn allowing a continuous follow up of the afterglow
discovered by Beardmore et al. (GCNC 12859).
The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
This image was obtained during the fading of the
gamma emission. We extracted three measurements from
the trail.
A first magnitude extraction is reported in the following
table. As noticed by LaCluyze et al. (GCNC 12864), the
optical emission decreased slowly in the range 33s to 200s,
then it increased to reach a maximum R=16.8 at 850 +/- 50s.
A decay phase alpha=1.3 occured between 10^3 and 10^4 seconds.
As noticed by Elenin et al. (GCNC 12871) the begining of a
plateau is suspected after 10^4 seconds. The end of the
night over Chile does not allow to conclude definitively.
Note that the GRB was also observed at TAROT Calern (France)
but data are poor due to the low elevation of the field.
However, the afterglow is also detected in the TAROT Calern
images.
------------------------------------------
t1(min) t2(min) mag dmag
------------------------------------------
0.55 0.85 16.96 0.30
0.85 1.15 17.15 0.30
1.15 1.55 17.05 0.30
1.67 2.17 17.32 0.16
2.34 2.84 17.37 0.12
3.01 3.51 17.58 0.22
3.67 4.17 17.53 0.17
4.34 4.84 17.27 0.17
10.36 11.86 17.02 0.26
12.03 13.53 16.87 0.20
13.70 15.20 17.03 0.15
15.37 16.87 16.94 0.18
17.03 18.53 17.19 0.29
18.70 20.20 17.19 0.11
21.31 22.81 17.27 0.24
22.97 24.47 17.37 0.16
24.64 26.14 17.35 0.09
26.31 27.81 17.32 0.19
27.98 29.48 17.40 0.06
29.64 31.14 17.59 0.05
35.98 38.98 17.65 0.05
39.15 42.15 18.00 0.21
45.48 48.48 18.09 0.06
48.65 51.65 18.31 0.25
55.66 58.66 18.39 0.15
58.83 61.83 18.58 0.26
42.32 84.94 18.51 0.12
65.16 91.28 19.10 0.15
95.40 126.40 19.51 0.09
129.73 195.34 19.78 0.12
199.45 261.71 19.90 0.08
GCN Circular 12884
Subject
GRB 120119A, Swift-BAT refined analysis
Date
2012-01-20T22:42:20Z (13 years ago)
From
Hans Krimm at NASA-GSFC <hans.a.krimm@nasa.gov>
M. Stamatikos (OSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
A. P. Beardmore (U Leicester), J. R. Cummings (GSFC/UMBC),
E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC),
J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+395 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 120119A (trigger #512035)
(Beardmore, et al., GCN Circ. 12859). The BAT ground-calculated position is
RA, Dec = 120.029, -9.076 deg which is
RA(J2000) = 08h 00m 06.9s
Dec(J2000) = -09d 04' 35.3"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
The mask-weighted light curve shows a series of three overlapping peaks running
from T-10 sec to T+220 sec, with the bulk of emission before T+60 sec.
T90 (15-350 keV) is 253.8 +- 24.5 sec (estimated error including systematics).
Swift started to enter the South Atlantic Anomaly at T+ ~200 sec and collection of
event data was terminated at T+395 sec.
The time-averaged spectrum from T-13.2 to T+361.9 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.38 +- 0.04. The fluence in the 15-150 keV band is 1.7 +- 0.0 x 10^-5 erg/cm2.
The 1-sec peak photon flux measured from T+9.21 sec in the 15-150 keV band
is 10.3 +- 0.3 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/512035/BA/
GCN Circular 12892
Subject
GRB 120119A: optical upper limit
Date
2012-01-21T22:00:47Z (13 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev, K. Grankin (CrAO), A. Pozanenko (IKI) on behalf of larger
GRB follow up collaboration report:
We observed the field of the Swift GRB 120119A (Beardmore et al., GCN
12859) with AZT-11 telescope of CrAO observatory on Jan. 19. We took
several images in R-filter under poor seeing (FWHM ~ 4.4") on Jan.19,
between (UT) 18:35 - 19:59. We do not detect the OT (Beardmore et al. GCN
12859). Photometry is based on USNO-B1.0 star 0809-0167535 (08 00
04.98 -09 03 55.5) assuming R=16.22:
t-t0 filter Exp. UpperLimit
(mid, days) (s)
0.6347 R 28x180 21.1
GCN Circular 12894
Subject
GRB 120119A: GRT detection of early afterglow
Date
2012-01-22T02:16:11Z (13 years ago)
From
Takanori Sakamoto at NASA/GSFC <takanori.sakamoto-1@nasa.gov>
T. Sakamoto (UMBC/GSFC), D. Donato (ORAU/GSFC), N. Gehrels (GSFC),
T. Okajima (GSFC), Y. Urata (NCU)
We observed the field of GRB 120119A detected by Swift
(trigger #512035; Beardmore et al., GCN Circ. 12859) with the 14-inch
Goddard Robotic Telescope (GRT) located at the Goddard Geophysical
and Astronomical Observatory (http://cddisa.gsfc.nasa.gov/ggao/).
A total 294 images of 5 sec (200 images), 30 sec (60 images) and
60 sec (34 images) exposures were taken in the R filter starting
from January 19 04:06:42 (UT), about 132 seconds after the trigger
(114 seconds after the BAT position notice), and stopped on
January 19 06:07:50 (UT).
We detect the optical afterglow inside the XRT error circle (Beardmore
et al., GCN Circ. 12876) in the stacked image of good quality 5 sec
exposure images (total exposure of 985 sec). The estimated magnitude is
R = 17.24 +- 0.19 mag (start time: 04:06:42, stop time: 04:44:37). We do
not detected the afterglow in the stacked images of 30 sec exposure images
(total exposure of 1560 sec) and 60 sec exposure images (total exposure of
2040 sec). The estimated five sigma upper limits of those stacked images
are ~17.9 mag (start time: 04:44:55, stop time: 05:30:01) and ~18.0 mag
(start time: 05:30:17, stop time: 06:07:50). All the reported magnitudes
are estimated using the USNO-B1 catalog.
GCN Circular 12895
Subject
GRB 120119A: EVLA observations
Date
2012-01-22T23:17:26Z (13 years ago)
From
Ashley Zauderer at CfA <bevinashley@gmail.com>
A. Zauderer and E. Berger (Harvard) report on behalf of a larger
collaboration:
"We observed the position of GRB 120119A (GCN 12859) with the EVLA
beginning 2012 Jan 21.2 UT (2.0 days after the burst) at a mean
frequency of 5.8 GHz. No significant radio emission is detected at the
enhanced Swift-XRT position (GCN 12876), the UVOT position (GCN 12859)
or optical position (e.g. GCN 12881), to a three-sigma upper limit of
34 uJy."
GCN Circular 12897
Subject
GRB 120119A : SMA submm follow-up observation
Date
2012-01-24T02:54:46Z (13 years ago)
From
Yuji Urata at Nat. Central U. <urata@astro.ncu.edu.tw>
Y. Urata (NCU), S. Takahashi, K.Y. Huang (ASIAA)
and G. Petitpas (SMA)
We observed the field of GRB120119A (Siegel et al., GCN 12720) with
the Sub-Millimeter Array (SMA). The observation in the 225 GHz band
was started at January 19 11.1 UT (7.1 hours after the trigger).
Our preliminary analysis show no counterpart brighter than 8.1 mJy (3-sigma).
GCN Circular 12898
Subject
GRB 120119A : LOAO Optical Observations
Date
2012-01-24T09:13:48Z (13 years ago)
From
Minsung Jang at Seoul National U <rigel103@snu.ac.kr>
M. Jang, M. Im (SNU), and Y. Urata (NCU) on behalf of EAFON
We observed GRB 120119A (GCN 12859, Beardmore et al.) in B,V,R- bands
with a 1 m telescope at Mt. Lemmon, Arizona, US.
The observation began at 06:03:31 UT, ~ 2 hours after burst alert.
We took 3 frames for each filter with the exposure time, 300 secs
The afterglow candidate was detected in stacked images of all three filters
with a preliminary magnitude R ~ 20.3 +/- 0.2 mag.
The photometry calibration is based on two USNO B1.0 stars,
USNO-B1.0 0809-0167573 and 0808-0168858
We thank the LOAO operator, J. Yoon for his help with the observation.