GRB 120202A
GCN Circular 12909
Subject
GRB 120202A: A long GRB detected by INTEGRAL
Date
2012-02-02T22:53:28Z (13 years ago)
From
Sandro Mereghetti at IASF/CNR <sandro@iasf-milano.inaf.it>
S.Mereghetti (IASF-Milano), D.Gotz (CEA-Saclay), J. Borkowski (CAMK,
Torun), E. Bozzo, C.Ferrigno, A.Taylor (ISDC, Versoix), on behalf of the
IBAS Localization Team report:
a long gamma ray burst lasting about 100 s has been detected by IBAS in
the IBIS/ISGRI data at 21:40:17 UT of February 2.
Its refined coordinates (J2000) are:
RA: 203.5065 [degrees],
DEC: 22.7747 [degrees]
with an uncertainty of 2.5 arcmin (90% c.l.).
A preliminary analysis gives a 20-200 keV fluence of about 7e-7 erg/cm2
and a peak flux of about 0.2 ph/cm2 s (1 s integration time).
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
[GCN OPS NOTE(03feb12): Per author's request, the typo on the exponent
of the fluence was changed from "-8" to "-7".]
GCN Circular 12910
Subject
GRB 120202A: TAROT Calern observatory optical observations
Date
2012-02-03T00:13:09Z (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 120202A detected by INTEGRAL
(trigger 6461) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.
The observations started 20s after the GRB trigger
(14s after the notice). The burst was still active.
The elevation of the field increased from 9 degrees
above horizon and weather conditions were good.
The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+20s to t0+80s : R > 15.2
The second image is 30.0s exposure in tracking mode:
t0+96s to t0+126s : R > 15.9
We co-added a series of exposures:
t0+96s to t0+287s : R > 17.2
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=11.1564 lat=+79.4238
and the galactic extinction in R band is 0.05 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.
GCN Circular 12911
Subject
GRB 120202A: Swift/XRT and UVOT observations
Date
2012-02-03T21:55:00Z (13 years ago)
From
Giulia Stratta at ASDC <giulia.stratta@gmail.com>
S. Holland (NASA/GSFC), V. D'Elia (ASDC), G. Stratta (ASDC),
R. Starling (U. Leicester) report on behalf of the Swift team:
We have analysed 4.5 ks of XRT data for the INTEGRAL-detected burst:
GRB 120202A (Mereghetti et al., GCN Circ. 12909), from 33.9 ks to 58.6 ks
after the INTEGRAL trigger.
The data are entirely in Photon Counting (PC) mode.
An X-ray source is detected within the INTEGRAL error circle at:
RA, Dec = 203.503595, 22.773873 deg which is equivalent to:
RA (J2000): 13h 34m 00.86s
Dec(J2000): +22d 46' 25.94"
with an uncertainty of 4.8 arcsec (radius, 90% confidence).
The source count rate is 3.26E-03+/-1.1E-03 cts/s (1 sigma error).
This position is 10.1 arcsec from the INTEGRAL position.
We note that there is a bright SDSS galaxy at about 32 arcseconds
from the burst position, within the INTEGRAL error circle.
At the present time we can not assess whether the source is fading or not.
The Swift/UVOT observed the field of GRB 120202A starting 33,899 s
after the INTEGRAL/IBAS trigger.
We do not detect an optical afterglow inside the XRT error circle.
Preliminary 3-sigma upper limits for detecting a source in the the co-added
images are
Filter TSTART TSTOP EXPOSURE Mag
---------------------------------------------------
v 35,727 64,596 485 >20.0
u 33,899 64,484 2884 >22.0
white 34,522 64,580 1305 >22.4
---------------------------------------------------
The quoted magnitudes and upper limits have not been corrected for
the Galactic extinction along the line of sight to this burst of
E_{B-V} = 0.02 mag (Schlegel et al. 1998, ApJS, 500, 525).
GCN Circular 12912
Subject
GRB 120202A: WHT, Gemini & UKIRT candidate afterglow
Date
2012-02-03T22:14:28Z (13 years ago)
From
Nial Tanvir at U.Leicester <nrt3@star.le.ac.uk>
N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick),
L. Dom��nguez Palmero (ING), S. Leggett (Gemini) & T. Wold (JACH)
report on behalf of a larger collaboration:
We imaged the field of GRB120202A (Mereghetti et al. GCN12909) using the
WHT/ACAM and Gemini-N/GMOS.�� At the location of the X-ray source identified
by Holland et al. (GCN12911) we find a faint source at position:
13:34:00.80�� +22:46:24.3
with the following provisional magnitudes (both photometry and astrometry are
calibrated against SDSS DS8):
WHT
r= 25.00 +/- 0.15�� (approx 7:40 hours post-burst)
Gemini-N
r=24.84 +/- 0.09 (approx 16:10 hours post-burst)
Thus there is no clear evidence for variability.��
There is however another point source close to the reported Swift XRT
source at position:
13:34:01.27 +22:46:29.0
slightly outside the reported 90% error circle, for which
we find magnitudes:
WHT:������
r=24.68 +/- 0.09,���� z=22.93 +/- 0.18
Gemini:����
r=24.26 +/- 0.06,���� z=22.64 +/- 0.08
Thus, there is evidence of brightening for this source by about
0.3-0.4 mag between the two epochs, making it likely associated with
the GRB, albeit with unusual afterglow behaviour.�� For this source we also
have a K-band magnitude from UKIRT/WFCAM:
K=18.35 +/- 0.18�� (calibrated against 2MASS, taken at 15:00 hours post-burst)
indicating a very red colour from the provisional photometry.
GCN Circular 12913
Subject
GRB 120202A: GROND observations
Date
2012-02-03T23:59:46Z (13 years ago)
From
Patricia Schady at MPE/Swift <pschady@mpe.mpg.de>
P. Schady, J. Greiner (both MPE Garching), S. Schmidl and D.A. Kann
(both TLS Tautenburg), J. Greiner (MPE Garching) and report on behalf
of the GROND team:
We observed the field of the INTEGRAL burst GRB 120202A (Mereghetti et
al., GCN #12909) 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 06:25 UT on February 3rd, 8.8 hrs after the
GRB trigger. They were performed at an average seeing of 1arcsec and
at high airmass.
Within a 1.5hrs of stacked data we detect a source within the Swift-
XRT error circle (Holland et al., GCN #12911) consistent with the
first position reported by Tanvir et al. (GCN #12912). We measure an
r'(AB) magnitude of 24.8+/-0.2, in agreement with Tanvir et al.
In addition, we also detect the second source reported by Tanvir et
al. in all the GROND optical and NIR bands, although we find that
during our observations the source faded by 0.2-0.3 magnitudes. At a
mid-time of 06:53 UT the source had an r'(AB) magnitude of 23.7+/-0.1,
and at a mid-time of 08:11UT had faded to 24.0+/-0.1.
The above magnitude has been calibrated against SDSS and is not
corrected for the expected Galactic foreground extinction
corresponding to a reddening of E_(B-V)=0.02 mag in the direction of
the burst (Schlegel et al. 1998).
GCN Circular 12915
Subject
GRB 120202A: D50 optical limits
Date
2012-02-05T18:49:33Z (13 years ago)
From
Jan Strobl at AI AS CR,Ondrejov <jan@strobl.cz>
M. Blazek, P. Skala, R. Hudec, C. Polasek and J. Strobl
Astronomical Institute of the Academy of Sciences of the Czech Republic
We observed the field of GRB 120202A (Mereghetti et al., GCN 12909) with
0.5m robotic telescope D50 in Ondrejov observatory (Czech Republic). The
observation started at 23:45:46 UT on February 02, 2012, approx. 2 hours
after the INTEGRAL trigger. We report no detection of the optical
counterpart on the unfiltered images within the error circle given by
SWIFT/XRT (Holland et al., GCN 12911). The upper limit of 20.5 mag in R
band was estiated using nearby sources from GSC2.2 catalogue.
This message may be cited.
This research was made on behalf of larger cooperation and used RTS2
system.
GCN Circular 12917
Subject
GRB 120202A: MASTER early optical observations
Date
2012-02-06T16:13:53Z (13 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina,
N.Shatskiy, P.Balanutsa, V.V.Chazov, A.Kuznetsov,
D.Zimnukhov, M. Kornilov, A.Kuznetsov, D.Zimnukhov, M. Kornilov,
A.Sankovich, S. Shurpakov
Moscow State University, Sternberg Astronomical Institute
O.Gres, O.Chuvalaev,K.Ivanov, V.A.Poleshchuk, S.Yazev, N.M.Budnev
Irkutsk State University
V.Krushinski, I.Zalozhnich, A. Popov
Ural State University, Kourovka
E. Sinykov, V.Yurkov, Yu.Sergienko, D.Varda,
Blagoveschensk Educational State University, Blagoveschensk
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Kislovodsk was pointed to the INTEGRAL GRB120202A (Mereghetti
et al., GCN Circ No 12909) 73 sec s after
notice time and 81 sec after GRB time at 2012-02-02 21:41:38.354 UT. On
our first (20s exposure) set we haven`t found optical transient within
INTEGRAL error-box. Some delay was due to non format socket alert.
The 5-sigma upper limit has been about 18.0 mag
The message may be cited.
GCN Circular 12919
Subject
GRB 120202A, the review of the sky area in plate archives
Date
2012-02-10T08:50:58Z (13 years ago)
From
Valentyna Golovnya at Main Astro Obs,Kyiv <golov_v@ukr.ne>
V.V.Golovnya (Main Astro Obs, Kyiv)
report:
We have undertaken the review of the sky area in vicinity of
GRB 120202� (S. Holland et al. GCN Circ.12911) on
astronegatives, collected in Ukrainian NAS Main astronomical
observatory plate archive (1976-1996). All the plates with
the possible object appearance are digitized using Microtek
ScanMaker 9800XL TMA and Epson Expression 10000XL flatbed
scanners and have been placed into Golosiiv Plate Archive
database DBGPA with open access to them.
The list of plates is given in the table:
YYYYMMDD/TimeUT --Plates-- Exp. LimMag Star USNOA2
19820324/220009 GUA040C000042A 22.5 15.6 1125-06747907
19820324/220009 GUA040D000043A 22.5 15.6 1125-06747907
19880514/200727 GUA040C001241A 18.0 15.6 1125-06747907
19890205/022521 GUA040C001421A 18.0 15.6 1125-06747907
19900223/005820 GUA040C001583A 19.0 15.6 1125-06747907
Plates: �the plates archive identifier of DWA (D/F=400/2000,
GUA040C, M=103"/mm) of the Ukrainian NAS Main Astro obs.
GUA040D (Marsden's number - 83) the plate number [1].
Exp. - Duration of the maximum exposure (minutes).
LimM - Limited V mag, derived in the 23 minutes area around
the location given in Holland et al. GCN Circ. 12911:
RA(J2000)= 13h 34m 00.86s, Dec(J2000)= +22d 46'25.94"
Star USNOA2 - Comparison star.
The preview images of 5 areas together with
the 23x23 min.of arc area from SkyMap can be found in
http://gua.db.ukr-vo.org/img/grb/120202A/index.html
The images with full resolution are available via e-mail on
demand.
References:
1.L.Pakuliak DATABASE of GOLOSIIV PLATE ARCHIVE (DBGPA V2.0),
http://gua.db.ukr-vo.org