GRB 071112C
GCN Circular 7059
Subject
GRB 071112C: Swift detection of a burst with an optical counterpart
Date
2007-11-12T18:50:05Z (18 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
M. Perri (ASDC), G. Stratta (ASDC), S. D. Barthelmy (GSFC),
P. J. Brown (PSU), J. R. Cummings (NASA/UMBC),
G. Cusumano (INAF-IASFPA), N. Gehrels (NASA/GSFC), C. Gronwall (PSU),
S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU),
C. B. Markwardt (CRESST/GSFC/UMD), P. T. O'Brien (U Leicester),
J. P. Osborne (U Leicester), C. Pagani (PSU), D. M. Palmer (LANL),
A. M. Parsons (GSFC), J. L. Racusin (PSU),
P. Romano (Univ. Bicocca & INAF-OAB),
R. L. C. Starling (U Leicester), T. N. Ukwatta (GSFC/GWU) and
D. E. Vanden Berk (PSU) report on behalf of the Swift Team:
At 18:32:57 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 071112C (trigger=296504). Swift slewed immediately to this burst.
The BAT on-board calculated location is
RA, Dec 39.220, +28.381 which is
RA(J2000) = 02h 36m 53s
Dec(J2000) = +28d 22' 50"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). We do not know anything about the lightcurve
from this "C" burst, because it came so closely after the
previous ("B") burst that the on-board script was still running.
The XRT began observing the field at 18:34:21 UT, 84 seconds after the
BAT trigger. XRT found a fading uncatalogued X-ray source
located at RA, Dec 39.2122, +28.3708 which is
RA(J2000) = 02h 36m 50.9s
Dec(J2000) = +28d 22' 14.9"
with an uncertainty of 4.1 arcseconds (radius, 90% containment).
This location is 44 arcseconds from the BAT on-board position,
within the BAT error circle. The initial flux in the 2.5s image
was 1.3e-09 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm)
filter starting 92 seconds after the BAT trigger. There is a fading candidate
afterglow in the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 02:36:50.93 = 39.2122
DEC(J2000) = +28:22:16.7 = 28.3713
with a 1-sigma error radius of about 0.5 arc sec. This position is 1.8 arc sec.
from the center of the XRT error circle. The estimated magnitude is 17.3 with a
1-sigma error of about 0.5 mag. No correction has been made for extinction.
Burst Advocate for this burst is G. Stratta (giulia.stratta AT asdc.asi.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 Circular 7061
Subject
GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
Date
2007-11-12T19:43:56Z (18 years ago)
From
Fang Yuan at ROTSE <yuanfang@umich.edu>
F. Yuan (U Mich), E.S. Rykoff (UCSB), W. Rujopakarn (Steward), H. Swan
(U Mich), report on behalf of the ROTSE collaboration:
ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia,
responded to GRB 071112C (Swift trigger 296504; Perri, M. et. al., GCN
7059). The first image was at 18:34:01.8 UT, 64.3 s after the burst
(10.8 s after the GCN notice time). We detect the OT reported in GCN
7059. The magnitude of the OT was roughly constant for the first few
hundred seconds and then faded rapidly afterward. Further analysis is
ongoing. The unfiltered images are calibrated relative to USNO B1.0.
Midtime UT mag magerror mlim(of image)
--------------------------------------------------------------------
18:34:56.4 17.3 0.2 17.1
18:38:52.2 17.1 0.1 18.0
18:47:46.5 18.9 0.3 18.4
A jpeg image of the OT (object 82) is available at
http://www.rotse.net/images/gsb296504_3c011-020_key.jpg
Continuing observations are in progress.
GCN Circular 7062
Subject
GRB 071112C: Optical and NIR afterglows observed with KANATA
Date
2007-11-12T20:07:47Z (18 years ago)
From
Makoto Uemura at Hiroshima U <uemuram@hiroshima-u.ac.jp>
M. Uemura, M. Sasada, A. Arai, and T. Uehara (Hiroshima Univ.),
report on behalf of the KANATA GRB team:
We performed optical-NIR observations of the field of
GRB 071112C (GCN Circ. 7059) with TRISPEC attached to
the "KANATA" 1.5-m telescope.
We found a fading object at the position of the optical
afterglow detected with UVOT.
Our preliminary results are below:
time(UT) mag. exposure_time
Nov. 2007 (sec)
12.77880 17.76 +/- 0.14 V 30sec * 10
12.77911 16.39 +/- 0.22 J 25sec * 9
12.78674 18.66 +/- 0.20 V 123sec * 5
12.78672 17.16 +/- 0.17 J 120sec * 5
Comparison star:
V-band: GSC2.3 02:36:55.72 +28:21:03.7 V=14.15
J-band: 2MASS 02:36:55.72 +28:21:03.7 J=12.674
The large errors of magnitudes are due to the rapidly
fading trend of the afterglow.
Further observation and analysis are ongoing.
GCN Circular 7063
Subject
GRB071112C Xinglong_TNT_and_EST_afterglow observations
Date
2007-11-12T20:12:17Z (18 years ago)
From
L.P. Xin at NAOC <xlp@bao.ac.cn>
X.F.Wang, L.P. Xin, M. Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng,
J. Wang, Y. Urata and W.K. Zheng on behalf of EAFON report:
We have imaged the field of GRB071112C (M. Perri et al
GCN7059 ) using the TNT 0.8 telescope and EST 1.0 telescope at Xinglong
observatory.A series of white-band ,R-band and V-band images were obtained
from 18:34:51, 113s after the burst. In our 20*20s white-band combined image, �
we detected afterglow �as reported (M. Perri et al GCN 7059, F. Yuan
GDN7061).
The estimated brightness derived from USNO-B1.0 R2mag was R2=17.62+/-0.06 at
38.8s after the burst(mean time of the stacked image).
Further observations are going.
This message may be cited.
GCN Circular 7065
Subject
GRB 071112C: TAROT Calern observatory optical observations
Date
2007-11-12T21:35:14Z (18 years ago)
From
Alain Klotz at CESR-CNRS <Alain.Klotz@free.fr>
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 071112 detected by SWIFT
(trigger 296504) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.
The observations started 65.0s after the GRB trigger
(10.7s after the notice). The elevation of the field increased from
from 38 degrees above horizon and weather conditions
were fully cloudy until 90 minutes after the GRB.
We co-added a series of exposures taken between 98
and 155 min. We detect the OT reported by Perri et
al. (GCNC 7059) near the limiting magnitude:
t_grb+98 min. to t_grb+155 min. : R = 20.1 +/- 0.3
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.
This message may be cited.
GCN Circular 7066
Subject
GRB 071112C: RTT150 optical observations
Date
2007-11-12T22:09:44Z (18 years ago)
From
Rodion Burenin at IKI, Moscow <rodion@hea.iki.rssi.ru>
R. Burenin, (IKI), I. Khamitov (TUG), M. Pavlinsky, R. Sunyaev (IKI),
Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.),
I. Bikmaev, N. Sakhibullin (KSU/AST)
report:
The optical counterpart of GRB 071112C (GCN 7059) was observed with
Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National
Observatory, Turkey), under poor observational conditions. First image was
taken 16.7 min after the burst. Assuming R=16.0 and B=16.76 magnitudes for
nearby star USNO-B1.0 1183-0043866 we estimated the following magnitudes for
the OT:
18:49:39 UT, B=18.8
18:54:08 UT, R=18.7
During the first hour after the burst the power law slope of the fading OT
flux is -0.83 +- 0.09 in R band and is approximatly similar in BVI.
This message may be cited.
GCN Circular 7067
Subject
GRB 071112C : Lulin R-band observation
Date
2007-11-12T23:29:39Z (18 years ago)
From
Yuji Urata at Saitama U <urata@crystal.heal.phy.saitama-u.ac.jp>
I.C. Chen (NCU), K.Y. Huang (ASIAA), Y. Urata (Saitama-U/ASIAA)
on behalf of the EAFON team
"We have observed the GRB 071112C field (Perri et al., GCN 7059) using
Lulin 1-m telescope. The R-band image with 150 sec exposure marginally
detected the optical afterglow (Perri et al., GCN7059, Yuan et al
GCN7061 Wang et al GCN7063) with 20.3 +/- 0.3 at 1.77 hrs after the
burst. This result is consistent with extrapolation from the RTT150
observations with power-law index -0.83 reported by Burenin et
al. (GCN7066)."
This message can be cited.
GCN Circular 7069
Subject
GRB 071112C: Palomar Pre-Imaging
Date
2007-11-12T23:40:19Z (18 years ago)
From
Josh Bloom at UC Berkeley <jbloom@astron.berkeley.edu>
P. Nugent (LBL) and J. S. Bloom (UC Berkeley) report:
"We have created a stacked image through the co-addition of 17
unfiltered images taken by the NEAT collaboration and 42 images in
the RG610 filter taken by the Palomar-Quest Consortium at the Palomar
Oschin Schmidt telescope (obtained from 2001-2007), of GRB 071112C
(Perri et al.; GCN 7059). The stacked image is significantly deeper
than the DSS (3 sigma limit of R~24 mag).
There is no source at the position of the UVOT counterpart (Perri et
al.; GCN 7059), however we do find a faint source 2.24" to the
southwest inside the XRT error circle at position:
02:36:50.79 +28:22:15.3 J2000
A preliminary reduction yield a magnitude of R=24.1 +/- 0.4 for that
source."
The image is available at http://www.lbl.gov/~nugent/deepsky.html
This message may be cited.
GCN Circular 7070
Subject
GRB071112C: NOT observations
Date
2007-11-12T23:55:27Z (18 years ago)
From
Johan U. Fynbo at U.Copenhagen <jfynbo@astro.ku.dk>
J. Sollerman (DARK and Stockholm), G. Leloudas (DARK), Pall Jakobsson
(Hertfordshire), J. P. U. Fynbo, D. Malesani, P. Vreeswijk (DARK) report
on behalf of a larger collaboration :
We obtained R-band imaging and a spectrum of the optical afterglow of GRB
071112C (Perri et al. GCN #7059) with the Nordic Optical Telescope on
November UT 12.9. Unfortunately our observations were hampered by clouds
so the signal-to-noise ratio of the spectrum is low. The optical afterglow
is clearly detected in our images. The continuum of the optical afterglow
is detected to 3800 AA so the redshift of GRB071112C is most likely less
than about 2.3. No significant lines are detected.
GCN Circular 7076
Subject
GRB 071112C: VLT redshift
Date
2007-11-13T05:40:58Z (18 years ago)
From
Pall Jakobsson at U Hertfordshire <P.Jakobsson@herts.ac.uk>
Pall Jakobsson (U. Hertfordshire), Johan P. U. Fynbo,
Paul M. Vreeswijk, Daniele Malesani (DARK, NBI) and
Jesper Sollerman (DARK, NBI; U. Stockholm) report
on behalf of a larger collaboration:
Using FORS2 on the Very Large Telescope, we have obtained
2*30 min spectra (grism 300V) of the optical afterglow
of GRB 071112C (Perri et al., GCN 7059).
The spectrum displays numerous Fe II lines and the Mg II
doublet (2796,2803) in absorption corresponding to a redshift
of z = 0.823 (based on a preliminary wavelength calibration).
At this redshift we also find emission lines corresponding
to [O II] 3728 and [O III] 5008.
We thank the Paranal staff for excellent support, especially
Stephane Brillant and Linda Schmidtobreick.
GCN Circular 7078
Subject
GRB 071112C: Optical observations at Crni Vrh
Date
2007-11-13T12:39:32Z (18 years ago)
From
Herman Mikuz at OCV <herman.mikuz@fmf.uni-lj.si>
B. Dintinjana, S. Maticic, H. Mikuz and J. Skvarc on behalf of PIKA
observing program at Crni Vrh Observatory:
We observed the afterglow of GRB 071112C (Perri et al., GCN 7059) with 60-cm
Cichocki robotic telescope at Crni Vrh Observatory, Slovenia in rather poor
seeing conditions. The series of nineteen 90 second connsecutive exposures
with Rc filter started at 18:35:51UT, 118 seconds after the GCN notice time.
We confirm optical afterglow found by UVOT. The object measured coordinates
are RA=02:36:50.95, DEC=+28:22:16.8 (J2000). The object was clearly detected
on first nine frames after which it dropped below the detection limit.
Photometry results are given in table below. The magnitudes are derived
using comparison stars from the USNO-B1 catalogue. The 3-sigma limiting
magnitude in R filter is around magnitude 18.2.
Time refers to exposure start.
Time (UT) Exposure(s) Mag. Err. Filter
2007 Nov 12.77490 90 17.25 0.13 R
2007 Nov 12.77659 90 17.49 0.15 R
2007 Nov 12.77826 90 17.84 0.18 R
2007 Nov 12.77994 90 17.82 0.21 R
2007 Nov 12.78162 90 18.53 0.29 R
2007 Nov 12.78330 90 18.81 0.63 R
2007 Nov 12.78498 90 18.51 0.31 R
2007 Nov 12.78665 90 18.68 0.49 R
2007 Nov 12.78834 90 18.88 0.62 R
GCN Circular 7079
Subject
GRB 071112C: Swift XRT refined analysis
Date
2007-11-13T14:46:22Z (18 years ago)
From
Giulia Stratta at ASDC <giulia.stratta@gmail.com>
G. Stratta (ASDC) , M. Perri (ASDC) and D. N. Burrows (PSU) report
on behalf of the Swift Team:
We have analysed the first 7 orbits of Swift-XRT data obtained
for GRB 071112C (Perri et al. GCN Circ.7059), totaling 281 s
of Windowed Timing (WT) data and 29.1 ks of Photon Counting (PC)
data.
Using 625 s of overlapping XRT Photon Counting mode and UVOT
V-band data, 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 =39.21220, 28.37102 which is equivalent to:
RA (J2000): 02 36 50.93
Dec (J2000): +28 22 15.7
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This is 1.0 arcsec from the previous XRT position, 0.7 arcmin
from the BAT position and 1.0 arcsec from the UVOT position
(Perri et al, GCN Circ. 7059).
The bright X-ray light-curve can be fit by a simple power-law,
with a decay index of 1.35 +/- 0.1.
Between about 400s and 1100s from the trigger, the data deviate
from the model, possibly pointing out a smooth re-brightening.
The WT data (91-372 seconds from trigger) can be modeled as an
absorbed power-law, with photon index of 1.7 +/- 0.1 and a total
absorbing column density consistent with the Galactic value of
NH=7.4e20 cm^-2 (Dickey & Lockmann 1990).
The 0.3-10 keV observed (unabsorbed) flux during this time is
4.4e-10(4.9e-10) erg cm^-2 s^-1.
Assuming the source continues to decay with the same decay
index of 1.35,we predict an XRT count rate of 3.0e-3 counts/s
at T+24 hours, which corresponds to an 0.3-10.0 keV observed
flux of 1.2e-13 ergs cm^-2 s^-1.
This circular is an official product of the Swift-XRT team.
GCN Circular 7080
Subject
GRB 071112C: Swift/UVOT observations
Date
2007-11-13T15:29:24Z (18 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S.R. Oates (MSSL/UCL) and G. Stratta (ASDC) report on behalf of the
Swift-UVOT team:
The Swift/UVOT observed the burst GRB 071112C (Perri et al., GCN Circ.
7059) starting with the finding chart exposure in white, 92 seconds
after the BAT trigger. The afterglow is detected at the UVOT position
given in Perri et al. (GCN Circ. 7059) in white, v, b,
u and uvw1. The afterglow decreases with an estimated temporal slope in
the v filter of alpha =1.28.
The UVOT magnitudes and upper limits from single exposures or
co-added exposures are given below:
Filter Tstart(s) Tstop(s) Exp(s) Mag
----------------------------------------------
white 92 192 98 17.39 +/- 0.03
859 958 98 19.0 +/- 0.1
v 198 597 393 17.8 +/- 0.08
965 1364 393 19.3 +/- 0.3
b 679 689 10 18.3 +/- 0.4
1444 1626 39 19.7 +/- 0.5 (2.0-sigma)
u 654 674 19 17.8 +/- 0.3
1419 1601 39 19.3 +/- 0.5 (2.0-sigma)
uvw1 630 649 19 17.7 +/- 0.3
1394 1576 39 19.0 +/- 0.5 (2.3-sigma)
uvm2 605 1552 78 >20.5
uvw2 708 1663 55 >20.6
----------------------------------------------
The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E_{B-V} = 0.119 mag in the
direction of the burst (Schlegel et al. 1998).
[GCN OPS NOTE(13nov07): Per author's request, in the first line "071121C"
was changed to "071112C"; and the first 'v' magnitude was changed from
"17.9 +/- 0.4" to "17.8 +/- 0.08".]
GCN Circular 7081
Subject
GRB 071112C: Swift-BAT refined analysis
Date
2007-11-13T19:49:40Z (18 years ago)
From
Jay R. Cummings at NASA/GSFC/Swift <jayc@milkyway.gsfc.nasa.gov>
H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC),
J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (BYU-Idaho), M. Koss (GSFC/UMD), C. Markwardt (GSFC/UMD),
D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU),
G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), G. Stratta (ASDC),
J. Tueller (GSFC), on behalf of the Swift-BAT team:
Using a partial data set from T-122 to T+10 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 071112C (trigger #296504)
(Stratta, et al., GCN Circ. 7059). Because of the unusually short time
between detection of GRB 071112B (Perri, et al., GCN Circ. 7058) and
this burst, we have only a partial data set. This analysis is based on
BAT survey data rather than "event" data. No event data were created for
this burst. In particular, the fluence quoted below does not include the
tail of the peak, though it appears to include about 80% of the total
fluence. The T90 period and our estimate of the 1-second peak photon
flux are a little more uncertain than usual as well, and the quoted
errors have been increased to reflect this.
The BAT ground-calculated position is (RA,Dec) = 39.218 +28.368
{02h 36m 52.3s,+28d 22' 04"} [deg; J2000] +- 1.0 arcmin, (radius,
sys+stat, 90% containment). The burst was in the fully-coded field of
view.
The burst consisted of a single FRED peak. T90 (15-350 keV) is
(15 +- 2) sec (estimated error including systematics).
The power law index of the time-averaged spectrum is 1.09 +- 0.07.
The fluence for the period T-122 to T+10 seconds (including about
80% of the total fluence) in the 15-150 keV band is
(3.0 +- 0.4) x 10^-6 erg/cm2. The 1-sec peak photon flux measured
from T+0 sec in the 15-150 keV band is 8 +- 1 ph/cm2/sec. All the
quoted errors are at the 90% confidence level.
GCN Circular 7082
Subject
GRB071112C MITSuME Okayama Optical Observation
Date
2007-11-13T23:06:45Z (18 years ago)
From
Michitoshi Yoshida at Okayama Astrophysical Obs <yoshida@oao.nao.ac.jp>
M. Yoshida, K. Yanagisawa, Y. Shimizu, S. Nagayama, H. Toda (OAO, NAOJ)
and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We performed optical imaging observations (G, Rc and Ic) of the field of
GRB 071112C (Perri et al., GCN 7059) with 50cm MITSuME telescope at
Okayama Astrophysical Observatory from UT 18:35 to UT 19:52 on November
12 2007.
We found a fading source at the position of the optical afterglow
reported by several authors (Yuan et al., GCN 7061; Wang et al., GCN
7063; Burenin et al., GCN 7066; Chen et al., GCN 7067; Sollerman et al.,
GCN 7070) in all bands. We made flux calibration using USNO B1.0
catalog. The photometric results are following.
start-T end-T mid-T exp-T G Rc Ic
---------------------------------------------------------------------
18:35:34 18:36:34 18:36:04 1min 17.1+-0.1 17.0+-0.1 17.9+-0.1
18:35:34 18:39:00 18:37:17 3min 17.2+-0.1 17.2+-0.1 18.0+-0.1
18:39:12 18:45:09 18:42:10 5min 17.9+-0.1 18.0+-0.1 18.6+-0.1
18:45:19 18:56:20 18:50:49 7min 18.8+-0.2 18.5+-0.2 19.6+-0.2
18:56:30 19:08:46 18:32:38 10min 19.3+-0.4 19.0+-0.2 >19.8
19:08:56 19:57:01 19:32:58 40min >19.5 19.6+-0.2 >20.0
---------------------------------------------------------------------
GCN Circular 7083
Subject
GRB 071112C : Second Epoch Lulin R-band observations
Date
2007-11-14T00:51:37Z (18 years ago)
From
Yuji Urata at Saitama U <urata@crystal.heal.phy.saitama-u.ac.jp>
I.C. Chen (NCU), K.Y. Huang (ASIAA), Y. Urata (Saitama-U/ASIAA)
on behalf of the EAFON team :
"A series of R-band images for GRB 071112C field (Perri et al., GCN
7059) were taken with 300 sec exposure using Lulin 1-m telescope. The
afterglow was detected clearly in our R-band combined
image. Comparison with nearby USNOB stars, the brightness of afterglow
is 22.7 +/- 0.2 at 0.806 days after the burst. This measurement is
consistent with the extrapolation from the RTT150 observations
(Burenin et al., GCN 7066) and implies no temporal break during our
two epochs of R-band observations (Chen et al.; GCN7067)."
This message can be cited.
GCN Circular 7084
Subject
GRB 071112C: SARA upper limit
Date
2007-11-14T03:26:40Z (18 years ago)
From
Adria C. Updike at Clemson U <aupdike@clemson.edu>
Adria C. Updike, Dieter H. Hartmann (Clemson University) and Kenneth S.
Rumstay (Valdosta University) report on behalf of the Clemson GRB
Follow-Up Team:
We imaged the field of GRB 071112C (GCN 7059, Perri et al.) with the
0.9m SARA telescope on Kitt Peak under decent weather conditions. We
obtained 75 min of stacked exposures beginning 8 hours and 47 min after the
trigger. We do not detect the afterglow (GCN 7059, Perri et al.) down
to a limiting magnitude of R ~ 21 in the stacked images (based on
calibration of 10 field stars to the USNO B1.0 catalog).
The SARA observatory website may be found at
http://astro.fit.edu/sara/sara.html .
This message may be cited.
GCN Circular 7086
Subject
GRB 071112C: Gemini Absorption Redshift
Date
2007-11-14T04:51:49Z (18 years ago)
From
Antonino Cucchiara at PSU <cucchiara@astro.psu.edu>
A. Cucchiara and D. B. Fox (Penn State), with E. Berger (Princeton and
Carnegie
Observatories), report on behalf of a larger collaboration:
"Starting on 2007 November 13.33 UT we observed GRB 071112C (Perri et
al., GCN
7059) with the GMOS spectrograph on the Gemini North telescope.
We obtained 4x900 sec spectra in the wavelength range 3900-6800A.
We clearly observe several metal absorption features corresponding to MgII,
MgI, FeII, and MnII at a redshift z = 0.823, confirming the preliminary
redshift reported from VLT observations by Jacobsson et al.(GCN 7076)."
GCN Circular 7087
Subject
GRB 071112C MITSuME Akeno early optical observation
Date
2007-11-14T06:44:18Z (18 years ago)
From
Nobuyuki Kawai at Tokyo Tech <nkawai@hp.phys.titech.ac.jp>
T. Ishimura, T. Shimokawabe, Y. Mori, Y. Kudou, N. Vasquez, Y. Yatsu,
and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 071112C (Perri et al., GCN 7059) with
the 3-color 50cm MITSuME Telescope at Akeno, Japan starting at
18:34:39 UT, 102s after the trigger.
In the images of g' and Rc bands, we detected the optical
counterpart reported by several authors (GCNs 7059, 7061, 7062 etc.).
Photometric calibration was done using the USNO-B1.0 (Ic-band) and
NOMAD (g'-bands) catalogs. The results are following:
start time end time Exposure g' [mag] Rc[mag]
---------------------------------------------------------------
18:34:39 18:35:39 1 x 60s 17.6 +/- 0.5 17.3 +/- 0.3
---------------------------------------------------------------
GCN Circular 7088
Subject
GRB 071112C: emission lines and refined VLT redshift
Date
2007-11-14T14:18:30Z (18 years ago)
From
Pall Jakobsson at U Hertfordshire <P.Jakobsson@herts.ac.uk>
Pall Jakobsson (U. Hertfordshire), Johan P. U. Fynbo,
Daniele Malesani, Paul M. Vreeswijk, Jens Hjorth, Dong Xu
(DARK, NBI) and Jesper Sollerman (DARK, NBI; U. Stockholm)
report on behalf of a larger collaboration:
We have flux calibrated the VLT spectrum of the GRB 071112C
optical afterglow (Jakobsson et al., GCN 7076). We clearly
detect four emission lines: [O II] 3727, [Ne III] 3869 and
[O III] 4960,5008. Using the relations by Kennicutt (1998,
ARA&A, 36, 189), the flux of the [O II] line corresponds to
a star formation rate (SFR) of approximately 0.5 M_Sun/year.
This value has not been corrected for host extinction or slit
loss, and is therefore a strict lower limit to the actual SFR.
The flux ratio of [Ne III] and [O II] is typical of GRB
host galaxies, with log([Ne III]/[O II]) ~ -0.5 (see Fig 4
in Wiersema et al., arXiv:0706.1345v1). The presence of
such strong emission lines in the OA spectrum indicates
a fairly bright host, approximately 24 < R < 25 (see also
Nugent & Bloom, GCN 7069).
Finally, using new wavelength calibration files we report
a more accurate absorption redshift (based on 8 lines):
z = 0.8230 +/- 0.0003.
GCN Circular 7089
Subject
GRB 071112C: optical observation
Date
2007-11-14T15:59:03Z (18 years ago)
From
Giuseppe Greco at U Bologna <giuseppe.greco2@studio.unibo.it>
G. Greco (Bologna University), F. Terra (Second University of
Roma "Tor Vergata"), C. Bartolini, A. Guarnieri, A. Piccioni
(Bologna University), G. Pizzichini (INAF/IASF Bologna),
D. Nanni (INAF/OAR and Second University of Rome "Tor Vergata"),
R. Gualandi (Bologna Observatory) report:
We observed the afterglow of GRB 071112C (Perri et al., GCN 7059)
with the 152 cm Cassini Telescope located in Loiano under clear
sky conditions (seeing approximately 1.8 arcsec).
We obtained three 20 min Rc-band images
starting on 2007 November 12.929 UT (mean time).
In our co-added images we estimated the following magnitude
by comparison with the NOMAD1 catalog: Rc= 21 +/- 0.2
This result is consistent with a power-law index = -0.8 as
reported by Burenin et al. (GCN7066) and Chen et al. (GCN 7083).
The co-added Rc image, in which the comparison stars are marked, has been
posted in our public directory from where it can be retrieved
by sftp using
hostname: ermione.bo.astro.it
username: publicGRB
password: GRB_bo.
directory: GRB071112C
GCN Circular 7090
Subject
GRB 071112C: optical observation
Date
2007-11-14T19:45:18Z (18 years ago)
From
AAVSO GRB Network at AAVSO <matthewt@aavso.org>
Stefano Sposetti (Gnosca, Switzerland) reports to the AAVSO
International High Energy Network the following optical observations of
GRB071112C (GCN #7059, Perri et al.):
Stefano Sposetti reports the detection of the optical afterglow of
GRB071112C (Perri et al., GCN 7059, and several subsequent reports).
The afterglow was observed unfiltered for 2700 seconds, using a
0.4-meter Newtonian with an SBIG ST8XE CCD and no filter. Observations
commenced approximately 4 hours and 10 minutes post BAT detection; the
midpoint of the observational sequence was 2007 November 12.9625 UT. The
afterglow was detected at an unfiltered magnitude of 21.0 +/- 0.5,
calibrated relative to USNO-A2.0. This magnitude is consistent with the
reported detection by Greco et al. (GCN #7089) on November 12.929 UT at
Rc = 21 +/- 0.2.
A detailed report on these observations is available on the AAVSO website
at ftp://ftp.aavso.org/grb/StefanoSposetti_GRB071112C_2454419.20588_.txt
A fits image is available at
ftp://ftp.aavso.org/grb/StefanoSposetti_GRB071112C_2454419.20588_.fits
The AAVSO thanks the Curry Foundation for their continued support of the
AAVSO International High Energy Network.
GCN Circular 7091
Subject
GRB071112C: Errata of MITSuME Ic band photometry
Date
2007-11-15T01:05:31Z (18 years ago)
From
Michitoshi Yoshida at Okayama Astrophysical Obs <yoshida@oao.nao.ac.jp>
M. Yoshida, K. Yanagisawa, Y. Shimizu, S. Nagayama, H. Toda (OAO, NAOJ)
and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
The Ic band photometry results reported in GCN 7082 are not correct.
The correct values are 1.5 magnitude brighter than those in GCN 7082.
We made a mistake in calculating the zero point magnitudes of our Ic
band frames. We also checked the results of other two bands (g' and Rc)
photometry carefully and found they are correct.
Please discard the results of GCN 7082. The reviced data are following.
Observation date: 2007-11-12 UT
start-UT end-UT mid-UT exp-T g' Rc Ic
---------------------------------------------------------------------
18:35:34 18:36:34 18:36:04 1min 17.1+-0.1 17.0+-0.1 16.4+-0.1
18:35:34 18:39:00 18:37:17 3min 17.2+-0.1 17.2+-0.1 16.5+-0.1
18:39:12 18:45:09 18:42:10 5min 17.9+-0.1 18.0+-0.1 17.1+-0.1
18:45:19 18:56:20 18:50:49 7min 18.8+-0.2 18.5+-0.2 18.1+-0.2
18:56:30 19:08:46 18:32:38 10min 19.3+-0.4 19.0+-0.2 >18.3
19:08:56 19:57:01 19:32:58 40min >19.5 19.6+-0.2 >18.5
---------------------------------------------------------------------
GCN Circular 7092
Subject
GRB 071112C: WSRT Radio Observations
Date
2007-11-15T06:53:30Z (18 years ago)
From
Alexander van der Horst at NASA/MSFC <avdhorst@science.uva.nl>
A.J. van der Horst (NASA/MSFC) and R.A.M.J. Wijers (University of Amsterdam)
report on behalf of a larger collaboration:
"We observed the position of the GRB 071112C afterglow at 4.9 GHz with the
Westerbork Synthesis Radio Telescope at November 14 16.61 UT to November 15
4.60 UT, i.e. 1.92 - 2.42 days after the burst (GCN 7059).
We do not detect a radio source at the position of the optical counterpart
(GCN 7059). The three-sigma rms noise in the map around that position is
93 microJy per beam. The formal flux measurement for a point source at
the position of the optical counterpart is 44 +/- 31 microJy.
We would like to thank the WSRT staff for scheduling and obtaining these
observations."
[GCN OPS NOTE(18nov07): Per author's request, the afiliation in the From-line
was changed from U of Amsterdam to NASA/MSFC.]
GCN Circular 7094
Subject
GRB 071112C: Optical and NIR data observed with KANATA
Date
2007-11-15T15:13:07Z (18 years ago)
From
Makoto Uemura at Hiroshima U <uemuram@hiroshima-u.ac.jp>
M. Uemura, M. Sasada, A. Arai, and T. Uehara (Hiroshima Univ.),
report on behalf of the KANATA GRB team:
We finished a full reduction of our optical-NIR images
of the field of GRB061112C taken with TRISPEC/KANATA.
A part of preliminary results was reported in GCN Circ. 7062.
Obtained magnitudes are below:
# Time after burst V-mag err.
# (sec)
# mid start end
324 309 339 17.69 0.14
377 362 392 17.89 0.19
430 415 445 17.93 0.20
483 468 498 18.02 0.22
538 523 553 18.15 0.27
590 575 605 18.64 0.53
643 628 658 18.41 0.39
699 684 714 18.30 0.33
752 737 767 18.37 0.36
970 835 1105 18.72 0.36
1271 1136 1406 19.53 0.11
1571 1436 1706 19.59 0.39
1873 1738 2008 19.62 0.53
2173 2038 2308 19.61 0.13
3079 2340 3818 20.66 0.53
4583 3844 5322 19.80 0.34
#
# Time after burst J-mag err.
# (sec)
# mid start end
367 309 425 15.93 0.27
527 469 585 16.37 0.52
688 630 746 16.67 0.28
969 835 1103 17.07 0.42
1269 1136 1402 17.34 0.46
1570 1436 1704 17.19 0.18
1871 1738 2004 17.47 0.41
2172 2038 2306 17.50 0.45
3078 2340 3816 17.97 0.35
4581 3844 5318 >17.67
#
# Time after burst Ks-mag err.
# (sec)
# mid start end
541 309 773 15.00 0.37
1201 835 1567 15.91 0.50
1959 1593 2325 16.58 0.45
2728 2353 3103 16.70 1.01
4222 3130 5314 >16.77
Comparison star:
V-band: GSC2.3 02:36:41.48 +28:20:53.5 V=14.43
J-band: 2MASS 02:36:41.46 +28:20:53.4 J=13.238
K-band: 2MASS 02:36:41.46 +28:20:53.4 K=12.792
Using our data, we calculated decay indices, alpha :
alpha_V = 0.96 +/- 0.09
alpha_J = 0.82 +/- 0.06
alpha_Ks = 1.01 +/- 0.09
No prominent color change was seen during our observations.
After correcting the interstellar extinction in our galaxy
(Schlegel, et al. 1998), we calculated the spectral energy index,
beta = 0.65 +/- 0.03 between V and Ks-band region.
This beta is in agreement with the beta in X-rays
(GAMMA_X=1.7, beta_X=0.7, in Stratta et al. GCN Report 104.1),
while the optical emission is possibly affected by the
reddening effect in the host galaxy of the GRB.
As reported in Stratta et al. GCN Report 104.1,
there is an X-ray flare around 600-700 sec after the burst,
whose amplitude is about factor 4 on the decay trend.
We found that no correlated flux variation was found in our
V-, J-, and Ks-band data. The upper limit of the amplitude
is 0.4 mag in V-band.
GCN Circular 7096
Subject
VLA radio upper limit on GRB 071112C
Date
2007-11-16T11:54:58Z (18 years ago)
From
Poonam Chandra at U Virginia/NRAO <pc8s@virginia.edu>
P. Chandra (UVA/NRAO) and D. A. Frail (NRAO) report on behalf of the
Caltech-NRAO-Carnegie GRB Collaboration:
"We observed optically bright burst GRB 071112C (GCN 7059) using the VLA
at a frequency of 8.46 GHz. The observations were taken at 08.01 UT on
2007,
November 16th. We do not detect any radio emission at the Swift-UVOT
afterglow position (GCN 7059). The flux density limit at the afterglow
position is -19 +/- 38 uJy.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation operated under cooperative agreement by Associated
Universities, Inc."
GCN Circular 7135
Subject
GRB 071112C: Optical/NIR observations
Date
2007-11-26T22:26:00Z (18 years ago)
From
Paul Price at IfA,UH <price@ifa.hawaii.edu>
T. Minezaki (IoA, Tokyo), P.A. Price (IfA, Hawaii), Y. Yoshii (IoA,
Tokyo) and L.L. Cowie (IfA, Hawaii) report:
We observed the optical afterglow of GRB 071112C (GCN #7059) with the
MAGNUM telescope + MIPS dual-beam imager in RIJHK bands, commencing at
2007-11-13T05:26Z. We detect the afterglow in coadded images for each
of these bands, though only marginally in H and K. The following
afterglow magnitudes were calibrated using the USNO-B1.0 and 2MASS
catalogues:
Filter midtime(UTC) integ.time(min) magnitude
R 2007-11-13 6.5h 39 22.18 +- 0.11
I 2007-11-13 6.8h 39 22.06 +- 0.18
J 2007-11-13 6.2h 19 21.1 +- 0.3
H 2007-11-13 7.1h 18 21.2 +- 0.8 * marginally
K 2007-11-13 6.8h 18 19.1 +- 0.3 * marginally
This message may be cited.
GCN Circular 7334
Subject
Early optical shallow decay in GRB 071112C
Date
2008-02-27T10:46:31Z (17 years ago)
From
Kuiyun Huang at ASIAA <ljhuang@asiaa.sinica.edu.tw>
K. Y. Huang, M. E. Schwamb, J. H. Wang, C. Y. Wen, and TAOS team
The TAOS (Taiwan American Occultation Survey) telescopes responded to
GRB 071112C (Perri et al.,7059) and started to take images at 93s
after the burst (38s after the GCN notice time). The magnitude of
afterglow, compared with a nearby USNOB star, showed R~ 16.7 at 95.5s
after the burst. It is interesting to note that brightness of this
afterglow displayed a shallow decrease in our first few hundred
seconds. This behavior was also mentioned by Yuan et al. (GCN 7061)
in the ROTSE-IIIc observations. The further data analysis is ongoing.
This message may be cited.