GRB 141212A
GCN Circular 17158
Subject
GRB 141212A: Swift detection of a short burst
Date
2014-12-12T12:27:37Z (11 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@milkyway.gsfc.nasa.gov>
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC),
A. P. Beardmore (U Leicester), N. Gehrels (NASA/GSFC),
B.P. Gompertz (U Leicester), J. A. Kennea (PSU),
H. A. Krimm (CRESST/GSFC/USRA), F. E. Marshall (NASA/GSFC),
K. L. Page (U Leicester) and E. Troja (NASA/GSFC/UMCP) report on
behalf of the Swift Team:
At 12:14:01 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 141212A (trigger=621229). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 39.161, +18.151 which is
RA(J2000) = 02h 36m 39s
Dec(J2000) = +18d 09' 04"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows a single spike
with a duration of about 0.1 sec. The peak count rate
was ~3200 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 12:15:10.0 UT, 69.1 seconds after
the BAT trigger. Using promptly downlinked data we find an uncatalogued
X-ray source with an enhanced position: RA, Dec 39.1246, 18.1460 which
is equivalent to:
RA(J2000) = 02h 36m 29.90s
Dec(J2000) = +18d 08' 45.7"
with an uncertainty of 3.5 arcseconds (radius, 90% containment). This
location is 125 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. We cannot determine whether the source is
fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event
data gives a column density consistent with the Galactic value of 1.03
x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 72 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 0.10.
Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.com).
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 17160
Subject
GRB 141212A: MITSuME Akeno upper limits
Date
2014-12-12T13:38:41Z (11 years ago)
From
Taketoshi Yoshii at Tokyo Tech <yoshii.t.ac@m.titech.ac.jp>
T.Fujiwara, T. Yoshii, Y. Saito, Y. Tachibana, H. Ohuchi, Y. Yano,
S. Kurita, Y.Ono, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:
We observed the field of GRB 141212A (T. N. Ukwatta et al. GCN Circular #17158) 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 2014-12-12 12:14:32 UT (31 sec after the burst).
We did not find any new point source within XRT circle in all three bands.
The measured magnitudes are listed below.
T0+[sec] MID-UT T-EXP[sec] g' Rc Ic
--------------------------------------------------------------------------------------
61 12:17:29 240 >19.6 >19.0 >18.3
422 12:28:07 780 >20.0 >19.6 > 18.9
422 12:41:18 2340 >20.5 >20.1 >19.6
--------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.
GCN Circular 17161
Subject
GRB 141212A: Skynet R-COP Observations
Date
2014-12-12T15:14:45Z (11 years ago)
From
Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet <atrotter@physics.unc.edu>
A. Trotter, J. Haislip, D. Reichart, A. Verveer, T. Spuck, A. Aji, R.
Beauchemin, T. Berger, A. Dow, A. Foster, N. Frank, M. Hinckle, K.
Ivarsen, A. LaCluyze, M. Maples, J. Moore, M. Nysewander, C. Salemi, L.
Zbinden, and J. A. Crain report:
Skynet observed the Swift BAT/XRT localization of GRB 141212A (Ukwatta
et al., GCN 17158, Swift trigger=621229) with the 14" R-COP telescope at
Perth Observatory, Australia. Starting at 2014-12-12 12:24 UT and
continuing until 14:13 UT (t=10.2m-119m post-trigger), Skynet took a
total of 24x160s exposures in the B, V, R, and I bands. We stacked
subsets of these images to maximize the S/N ratio, and detected no
optical source in any band at the XRT position. Our 3-sigma limiting
magnitudes are:
==================================
tmid expos fil limit
==================================
87m 7x160s B >19.9
106m 8x160s V >20.5
41m 3x160s R >20.0
30m 2x80s I >18.5
==================================
Limiting magnitudes are in the Vega System, calibrated to 6 APASS stars
in the field. Magnitudes have not been corrected for line-of-sight
Milky Way dust extinction, with expected E(B-V)=0.09 (Schlafly &
Finkbeiner 2011).
No further Skynet observations are scheduled.
GCN Circular 17162
Subject
GRB 141212A: MASTER early optical observations
Date
2014-12-12T15:16:48Z (11 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, V.A.Poleshchuk
Irkutsk State University
E. Gorbovskoy,V. Lipunov, D.Denisenko, M.Pruzhinskaya, V.Kornilov, D.Kuvshinov,
N.Tyurina, P.Balanutsa, D.Zimnukhov, A.Kuznetsov
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory
V.Krushinsky, I.Zalozhnih, A. Popov
Ural Federal University, Yekaterinburg, Kourovka
Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest
Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in
Tunka was pointed to the GRB141212A 32 sec after notice time and 46 sec after
trigger time at 2014-12-12 12:14:47 UT. On our first (10s exposure) set we
haven`t found optical transient within SWIFT error-box (Ukwatta et alo., GCN
17158) .
The 5-sigma upper limit has been about 16.8 mag
Our upper limit on first single and coadd images available on table 1:
Table 1:
T_start T0-T_start T0-T_mid Exptime Limit Coadd
UT s s s 12:14:47.1 46 51
10 16.8 -
12:14:47.1 46 497 630 19.2 9
12:30:24.4 983 2251 2160 20.6 12
The message may be cited.
GCN Circular 17163
Subject
GRB 141212A: Correction to GCN 17162
Date
2014-12-12T15:25:32Z (11 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Vladimir lipunov (Lomonosow Moscow University)
I am sorry.
The correct representatio of the
Table 1 is:
T_start T0-T_start T0-T_mid Exptime Limit Coadd
UT s s s
12:14:47.1 46 51 10 16.8 -
12:14:47.1 46 497 630 19.2 9
12:30:24.4 983 2251 2160 20.6 12
The message may be cited.
GCN Circular 17164
Subject
GRB 141212A: Enhanced Swift-XRT position
Date
2014-12-12T16:53:25Z (11 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester)
report on behalf of the Swift-XRT team.
Using 885 s of XRT Photon Counting mode data and 1 UVOT
images for GRB 141212A, 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 = 39.12444, +18.14684 which is equivalent
to:
RA (J2000): 02h 36m 29.86s
Dec (J2000): +18d 08' 48.6"
with an uncertainty of 2.9 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 17167
Subject
GRB 141212A: 1.23m CAHA I-band observations
Date
2014-12-12T18:51:16Z (11 years ago)
From
Javier Gorosabel at IAA-CSIC <jgu@iaa.es>
J. Gorosabel (IAA-CSIC/UPV-EHU), R. Sanchez-Ramirez (UPV/EHU), S. Hellmich (DLR), S. Mottola (DLR), report on behalf of a larger collaboration:
We observed the field of GRB 141212A (Ukwatta et al. GCN Circ. 17158) with the 1.23m CAHA telescope starting on Dec 12.73309 UT (5.4 hours post bust). The observations were carried out in the I-band. No object brighter than I~21 (Vega) is detected within the XRT error circle (Osborne GCN Circ., 17164).
GCN Circular 17168
Subject
GRB 141212A: Khureltogot optical upper limit
Date
2014-12-12T20:09:31Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), S. Schmalz (AIP), N. Tungalag (Research Center of
Astronomy and Geophysics MAS), A. Volnova (IKI), I.Molotov (KIAM), A.
Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 141212A (Ukwatta et al., GCN 17158) with
ORI-40 telescope of Khureltogot observatory. We obtained 2 hours of
unfiltered images on Dec. 12 starting on (UT) 12:46:14. In a combined
image of the first 5 frames we do not detect any optical source within
enhanced Swift-XRT position (Osborne et al., GCN 17164). Preliminary
photometry is following
Date UT start t-T0 Filter Exp. ULimit (3sigma)
(mid, days) (s)
2014-12-12 12:46:14 0.02422 R 5*60 18.5
The photometry is based on USNO-B1.0 stars
USNO-B1_id RA DEC R2
1081-0038366 039.120895 +18.127567 16.32
1081-0038391 039.149945 +18.154739 17.15
1081-0038340 039.085725 +18.167617 14.41
GCN Circular 17169
Subject
GRB141212A: xinglong TNT upper limit
Date
2014-12-12T21:58:48Z (11 years ago)
From
L.P. Xin at NAOC <xlp@bao.ac.cn>
L. P. Xin, T. M. Zhang, J. Y. Wei, Y. L. Qiu, J. S. Deng,
J. Wang, X. H. Han and C. Wu on behalf of EAFON report:
We began to observe GRB 141212A (Ukwatta eta l., GCN 17158)
with Xinglong 0.8-m TNT telescope at 2014-12-12, 12:14:40(UT),
about 39 sec the burst.
In any single W-band frame or coadded image, no any new
optical transient was detected within XRT circle
(Ukwatta eta l., GCN 17158; Osborne et al, GCN 17164 )
down to 3 sigma limit of R~20 mag at the mid-time of 4 min
after the burst, calibrated by the nearby USNO B1.0 R2 mag.
The message may be cited.
GCN Circular 17170
Subject
GRB 141212A: extended object within the XRT error circle
Date
2014-12-12T22:18:17Z (11 years ago)
From
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <malesani@dark-cosmology.dk>
D. Malesani (DARK/NBI), P. D'Avanzo (INAF/OABr), V. D'Elia (INAF/OAR and
ASI/ASDC), S. D. Vergani (CNRS/GEPI), G. Andreuzzi (INAF/TNG), A. Garcia
de Gurtubai Escudero (INAF/TNG), A. Bonomo (INAF/OATo), report on behalf
of the CIBO collaboration:
We observed the field of GRB 141212A (Ukwatta et al., GCN 17158) using
the TNG optical telescope located in La Palma. Observations started on
2014 Dec 12.832 UT (7.73 hr after the GRB) and consisted of 10x240 s in
the R band. The PSF in our image was around 1.5".
Within the XRT error circle (Osborne et al., GCN 17164; see also
http://www.swift.ac.uk/xrt_positions/), we detect a single, extended
object (A), with coordinates (J2000):
RA = 02:36:29.95
Dec = +18:08:47.2
Its Vega magnitude is R = 22.66 +- 0.23, assuming R = 16.83 for the USNO
star at RA = 02:36:35.95, Dec = +18:09:16.8.
We cannot yet make any claim about variability, so the connection of
this object with GRB 141212A is unclear. This may be the GRB host,
though some contribution from an afterglow cannot be excluded.
We also note the presence of two extended objects just outside the XRT
error circle.
(B): RA = 02:36:30.25, Dec = +18:08:50.1, R = 22.29 +- 0.16;
(C): RA = 02:36:29.64, Dec = +18:08:50.2, R ~ 24.0
Object (C) is barely detected. No other sources are visibile in the
proximity of the XRT error circle down to a limiting magnitude of R = 24.
A finding chart can be seen at the following URL:
http://www.astro.ku.dk/~malesani/GRB/141212A/GRB141212A_TNG.jpg
GCN Circular 17171
Subject
GRB 141212A: Swift-XRT refined Analysis
Date
2014-12-13T00:27:05Z (11 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), V. D'Elia
(ASDC), M. de Pasquale (INAF-IASFPA), A. Maselli (INAF-IASFPA), V.
Mangano (PSU), M.C. Stroh (PSU), D.N. Burrows (PSU), J.P. Osborne (U.
Leicester) and T.N. Ukwatta report on behalf of the Swift-XRT team:
We have analysed 7.9 ks of XRT data for GRB 141212A (Ukwatta et al.
GCN Circ. 17158), from 77 s to 28.9 ks after the BAT trigger. The
data are entirely in Photon Counting (PC) mode. The enhanced XRT
position for this burst was given by Osborne et al. (GCN Circ. 17164).
The light curve can be modelled with a power-law decay with a decay
index of alpha=0.62 (+0.20, -0.16).
If the light curve continues to decay with a power-law decay index of
0.62, the count rate at T+24 hours will be 7.6 x 10^-4 count s^-1
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00621229.
This circular is an official product of the Swift-XRT team.
GCN Circular 17172
Subject
GRB 141212A: MITSuME Okayama upper limits
Date
2014-12-13T00:54:34Z (11 years ago)
From
Daisuke Kuroda at OAO/NAOJ <dikuroda@oao.nao.ac.jp>
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 141212A (Ukwatta et al., GCNC 17158)
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 2014-12-12 12:15:02 UT (~62 sec after the burst).
We did not find any new point source within the enhanced XRT circle
(Osborne et al., GCNC 17164) 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
-----------------------------------------------------
0.04216 13:14:42 6000.0 >20.5 >20.1 >19.4
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
GCN Circular 17175
Subject
GRB 141212A: Swift-BAT refined analysis
Date
2014-12-13T05:02:51Z (11 years ago)
From
Tilan Ukwatta at MSU <tilan.ukwatta@gmail.com>
D. M. Palmer (LANL), S. D. Barthelmy (GSFC),
W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),
T. Sakamoto (AGU), M. Stamatikos (OSU),
J. Tueller (GSFC), T. N. Ukwatta (LANL)
(i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent
telemetry downlink, we report further analysis of BAT GRB
141212A (trigger #621229) (Ukwatta, et al., GCN Circ. 17158).
The BAT ground-calculated position is RA, Dec =
39.167, 18.163 deg which is
RA(J2000) = 02h 36m 40.1s
Dec(J2000) = +18d 09' 47.1"
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90%
containment). The partial coding was 58%.
BAT light curve shows a strong FRED like peak starting
around T-0.05 sec and ending around T+0.2 sec. Another
softer peak can be seen starting at T+0.2 sec, peaking
at T+0.3 sec and ending around T+0.35 sec. T90 (15-350 keV)
is 0.30 +- 0.08 sec (estimated error including systematics).
The time-averaged spectrum from T+0.00 to T+0.34 sec is
best fit by a simple power-law model. The power law index
of the time-averaged spectrum is 1.61 +- 0.23. The fluence
in the 15-150 keV band is 7.2 +- 1.2 x 10^-08 erg/cm2.
The 1-sec peak photon flux measured from T-0.33 sec in
the 15-150 keV band is 1.2 +- 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/621229/BA/
GCN Circular 17177
Subject
GRB 141212A: Gemini-N spectroscopy and photometry
Date
2014-12-13T07:52:21Z (11 years ago)
From
Ryan Chornock at Ohio U <chornock@ohio.edu>
R. Chornock (Ohio University), W. Fong (University of Arizona), and D. B. Fox
(Penn State) report:
We obtained imaging and spectroscopy of the field of the short GRB 141212A
(Ukwatta et al., GCN 17158) using GMOS on the 8 m Gemini-North telescope
starting at 04:35 UT on 13 December, 16.4 hours after the BAT trigger.
In 5x180s of i-band imaging with 0.5" seeing, all three objects found by
Malesani et al. (GCN 17170) are well detected. Using an archival calibration,
we measure i=22.2 +/- 0.1 mag for object A, the extended object present inside
the enhanced XRT error circle (Osborne et al., GCN 17164).
In addition, we oriented a spectroscopic slit through both extended objects A
and B (using the terminology of Malesani et al.). We obtained 2x900s of
spectroscopy with the R400 grating covering the wavelength range 5890-10100
Angs. Both galaxies exhibit prominent nebular line emission from [O II],
H-beta, and [O III]. Galaxy A, the likely host, has a redshift of z=0.596,
while Galaxy B has a redshift of z=0.672.
GCN Circular 17178
Subject
GRB 141212A: VLA upper limit
Date
2014-12-13T09:52:03Z (11 years ago)
From
Wen-fai Fong at U of Arizona <wfong@email.arizona.edu>
W. Fong (U. Arizona) and B. A. Zauderer (Harvard) report:
"We observed the field of the short-duration GRB 141212A (Ukwatta et al.,
GCN 17158) with the Karl G. Jansky Very Large Array (VLA) beginning on 2014
Dec 12.96 UT (10.9 hr post-burst) at a mean frequency of 6 GHz. In 1 hour
of observations, we do not detect any radio source within or around the
enhanced XRT position (Osborne et al., GCN 17164). We therefore place a
3-sigma limit of ~25 microJy on the radio afterglow of GRB 141212A at 10.9
hr after the burst.
We thank the VLA staff for quickly executing these observations."
GCN Circular 17180
Subject
GRB 141212A: Swift/UVOT Upper Limits
Date
2014-12-13T10:59:10Z (11 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (IAA-CSIC/UCL-MSSL) and T. N. Ukwatta (LANL)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 141212A
72 s after the BAT trigger (Ukwatta et al., GCN Circ. 17158).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 17164)
is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 72 222 147 >20.6
u_FC 286 535 246 >19.9
white 72 1531 392 >21.2
v 615 1581 117 >18.8
b 541 1681 117 >19.8
u 286 1655 343 >20.1
w1 664 1631 117 >19.3
w2 591 1210 39 >18.6
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.10 in the direction of the burst
(Schlegel et al. 1998).
GCN Circular 17184
Subject
GRB 141212A: Zadko observatory - Gingin optical observations
Date
2014-12-13T18:06:06Z (11 years ago)
From
Alain Klotz at IRAP-CNRS-OMP <Alain.Klotz@free.fr>
A. Klotz, D. Turpin (IRAP-CNRS-OMP), D. Macpherson (UWA/ICRAR), D.
Coward (UWA),
M. Boer, B. Gendre, K. Siellez, H. Dereli, O. Bardho (UNS-CNRS-OCA),
A. Williams (PO-UWA), R. Martin (PO-UWA)
report:
We imaged the field of GRB 141212A detected by SWIFT
(trigger 621229) with the Zadko robotic telescope (D=100cm)
located at the observatory - Gingin, Australia.
The observations started 123s after the GRB trigger.
The elevation of the field increased from
37 degrees above horizon and weather conditions
were good.
We do not detect any optical counterpart of the XRT afterglow
(Ukwatta et al. GCNC 17158, Malesani et al. GCNC 17170).
We give the details of the limiting magnitudes during the
twelve first minutes after the trigger:
t0+123s to t0+153s : Rlim = 18.6
t0+162s to t0+192s : Rlim = 18.6
t0+200s to t0+230s : Rlim = 18.6
t0+239s to t0+269s : Rlim = 18.6
t0+279s to t0+309s : Rlim = 18.6
t0+320s to t0+410s : Rlim = 19.8
t0+421s to t0+511s : Rlim = 19.8
t0+522s to t0+612s : Rlim = 19.8
t0+622s to t0+712s : Rlim = 19.8
We co-added a series of exposures:
t0+123s to t0+712s : Rlim = 20.3
Magnitudes were estimated with the nearby NOMAD1 stars
and are not corrected for galactic dust extinction.
GCN Circular 17185
Subject
GRB 141212A iTelescope observation
Date
2014-12-16T09:09:27Z (11 years ago)
From
Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>
D. Kawamura, T. Sakamoto, A. Yoshida (AGU)
We observed the field of GRB 141212A detected by Swift (trigger #621229;
Ukwatta et al., GCN Circ. 17158) with the iTelescope.Net (http://www.itelescope.net)
T11 (0.50 m Plane Wave) telescope located at the New Mexico Skies Observatory (NM, USA).
4 images of 60 sec exposures were taken in the R filter starting from December 12
12:38:28 (UT) about 24.5 minutes after the trigger and stopped on December 12 12:43:22 (UT).
We do not detect the optical afterglow both in the individual images and the stacked
image at the enhanced X-ray afterglow position (Osborne et al., GCN Circ. 17164).
The estimated five sigma upper limit of the combined image (total exposure of 240 sec)
is ~19.1 using the USNO-B1 catalog.
GCN Circular 17654
Subject
GRB 141212A: GMG observation limit
Date
2015-03-29T12:01:02Z (10 years ago)
From
Jirong Mao at Yunnan Obs <jirongmao_obs@ynao.ac.cn>
J. Mao, B. Lun and J.-M. Bai (YNAO) report:
We observed the field of GRB 141212A (Ukwatta et al., GCN 17158) with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG)
station of Yunnan Observatory. Observations began from UT 12:58:57.9 12th, Dec., 2014 (about 45 mins after the trigger).
We did not detect any optical source at XRT position down to a limit of R~22.0. In our single image, it is nearly impossible to
distinguish the sources clearly identified by Malesani et al. GCN 17170.
We thank Dr. D., Malesani for his kind suggestion and discussion. J. Mao apologizes for this very later GCN circular submission.