GRB 060203
GCN Circular 4643
Subject
Possible GRB 060203: optical observations at Asiago
Date
2006-02-04T03:24:10Z (19 years ago)
From
Daniele Malesani at SISSA-ISAS,Trieste,Italy <malesani@sissa.it>
S. Piranomonte (INAF/OAR), D. Malesani (SISSA), A. Pizzella, J.
Mendez-Abreu, L. Lessio (INAF/OAPd), I. Yegorova (SISSA), and N. Masetti
(INAF/IASF Bo) report on behalf of a larger collaboration:
We observed the field of the possible GRB 060203 (Swift trigger 180151;
Retter et al., GCN 4641) using the 182 cm Copernico telescope located in
Asiago (Italy), equipped with the AFOSC camera. Our images were taken in
the R filter, under moderate conditions (seeing 1.8 arcsec, thin cirrus).
Coaddition of three exposures lasting 10 minutes each one (mean time Feb
4.067 UT, 1.6 h after the trigger) reveals no new sources with respect
to the DSS 2, which reaches a comparable depth.
This message can be cited.
GCN Circular 4645
Subject
Possible GRB 060203: candidate optical counterpart
Date
2006-02-04T03:45:00Z (19 years ago)
From
Daniele Malesani at SISSA-ISAS,Trieste,Italy <malesani@sissa.it>
D. Malesani (SISSA) and S. Piranomonte (INAF/OAR) report on behalf of a
larger collaboration:
After the report of the position of the possible X-ray counterpart
(Burrows, GCN 4644) of the Swift trigger 180151 (Retter et al., GCN
4641), we inspected again our images taken at Asiago (Piranomonte et
al., GCN 4643).
Inside the XRT error circle we find a single object at the coordinates
(J2000):
alpha = 06:54:03.85;
delta = +71:48:38.4.
The error is estimated to be less than 0.5".
The magnitude of this object is R ~ 20.4 after assuming R=18.1 for the
closeby USNO star U1575_02633321 located 15 arcsec N-W.
We have no possibility yet to assess variability. Further observations
are in progress.
This message can be cited.
GCN Circular 4646
Subject
GRB 060203: P60 Confirmation of Optical Afterglow
Date
2006-02-04T04:07:04Z (19 years ago)
From
S. Bradley Cenko at Caltech <cenko@srl.caltech.edu>
S. B. Cenko, E. Ofek, A. M. Soderberg (Caltech), N. Cucchiara, D. B. Fox
(Penn State) report on behalf of a larger collaboration:
We have imaged the error circle of the possible Swift GRB060203
(Retter et al., GCN 4641) with the automated Palomar 60-inch
telescope. Observations consisted of 5 x 150 images in the Kron R filter,
taken at a mean epoch of approximately 03:38 UT February 4th.
Inside the XRT error circle, we find the afterglow candidate proposed by
Malesani et al. (GCN 4645). Furthermore, we find that since the
observations described in Piranomonte et al. (GCN 4643), the object has
faded. The approximate magnitude in our images, calibrated with respect
to the USNOB-2 catalog, is 21.3 +/- 0.3. We therefore conclude this
source is the optical afterglow of GRB060203.
GCN Circular 4647
Subject
GRB060203: Observations with SARA
Date
2006-02-04T04:08:20Z (19 years ago)
From
Autumn Homewood at Clemson U <ahomewo@clemson.edu>
T.P. McIntyre, S.P. Fuller, K.V. Garimella, A.L. Homewood, D.H. Hartmann
(Clemson University), M.A.Leake (Valdosta State University), on behalf of
the Clemson GRB Follow-Up Team, report:
We observed the Swift location box (Retter et al, GCN 4641) of GRB060203
with the SARA 0.9-m at Kitt Peak. We co-added 5 R-Band exposures of 300
seconds each, for a total integrated exposure time of 25 minutes,
beginning about two hours after the burst at UT02:02:07. At the position
given in GCN
4644 (Burrows) of the faint, possibly fading, and uncataloged X-ray source:
RA(J2000) = 6h 54m 3.9s
Dec(J2000) = +71d 48' 39"
we detect no new sources to a limiting magnitude of R ~ 19.2 mag compared
to the USNOA2.0 catalogue. Additionally, to the same limiting magnitude,
we find no new source across the complete original Swift error box of a
three arc-minute radius about:
RA(J2000) = 06h 54m 03s
Dec(J2000) = +71d 49' 25"
Observations/analysis ongoing.
The Clemson Unversity GRB Response SIte may be found at:
http://people.clemson.edu/~kgarime/burst/index.php
The SARA Homepage may be found at:
http://www.saraobservatory.org
This message may be cited.
GCN Circular 4648
Subject
GRB 060203: IR Counterpart
Date
2006-02-04T04:31:02Z (19 years ago)
From
Josh Bloom at UC Berkeley <jbloom@astron.berkeley.edu>
J. S. Bloom, K. Alatalo (UCB) and C. Blake (Harvard) report:
"Starting at 2006-Feb-04 01h41m09 UT we began observing the field of =20
GRB 060203 (GCN 4641) with PAIRITEL. We analyzed the mosaics =20
constructed from the first 918 seconds. Consistent with the XRT =20
position (GCN 4644, 4641) and the suggested OT (GCN 4643, 4645, =20
4646), we find a bright IR counterpart in JHKs with preliminary =20
magnitude:
J =3D 17.90 =B1 0.05
H =3D 17.20 =B1 0.06
Ks =3D 16.18 =B1 0.07
Observations continue."
This message may be cited.
GCN Circular 4649
Subject
Swift-BAT trigger is GRB 060203
Date
2006-02-04T04:32:04Z (19 years ago)
From
Scott Barthelmy at NASA/GSFC <Scott@lheamail.gsfc.nasa.gov>
J. Cummings (GSFC/NRC), L. Barbier (GSFC), S. Barthelmy (GSFC),
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (GSFC/UMD),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL),
A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS),
J. Tueller (GSFC)
on behalf of the Swift-BAT team:
Using the partial data set from T-60.0 to T+123.1 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 060203 (trigger #180151)
(Retter, et al., GCN 4641). The BAT ground-calculated position
is RA,Dec = 103.468,+71.841 deg {06h 53m 52s,+71d 50' 28"} (J2000)
+- 2.8 arcmin, (radius, sys+stat, 90% containment). This is 2 arcmin
from the ground-calculated XRT position in Circ 4644. The partial coding
was 50%.
The burst has a single broad shallow peak starting at T-20 to T+65 sec.
We are waiting for more data to be downlinked and may find that this burst
lasts longer than our current estimate. T90 (15-350 keV) is (83 +- 5) sec
(estimated error including systematics).
We note that our initial doubts about the reality of this burst have significantly
diminished after analyzing the Malindi data set, but these doubts have not
been completely eliminated. There is still a small possibility that this trigger
is a hard x-ray transient, and not a GRB. It is, however, not at all related
to a phantom trigger due to the star tracker problem.
GCN Circular 4650
Subject
GRB060203 - Swift UVOT observation
Date
2006-02-04T05:54:18Z (19 years ago)
From
Sally Hunsberger at PSU/Swift <sdh@astro.psu.edu>
S. D. Hunsberger (PSU), F. Marshall (GSFC), P. Boyd (GSFC),
P. Brown (PSU), and A. Cucchiara (PSU) on behalf of the
Swift UVOT team:
UVOT took its first exposure of GRB060203 (Retter et al. GCN 4641)
starting at 00:45:26 UT February 4th, approximately 2991 seconds after
the trigger. No source is seen in the 197 second exposure with the V filter
at the position of the reported optical afterglow (Malesani et al. GCN
4645;
Cenko et al. GCN 4646) with a 3-sigma upper limit of 19.3 mag.
GCN Circular 4651
Subject
GRB060203: Swift XRT Team Refined Analysis
Date
2006-02-04T07:33:49Z (19 years ago)
From
David Morris at PSU/Swift-XRT <morris@astro.psu.edu>
D. Morris (PSU), D. Burrows (PSU), N. Gehrels (GSFC), P. Boyd
(GSFC-UMBC), W. Voges (MPE) report on behalf of the Swift XRT team:
We have analyzed the Swift XRT data from the first two orbits of GRB
060203 (Retter et al., GCN4641), with a total exposure of 5000 seconds.
The refined XRT position is:
RA(J2000) = 06h 54m 04.35s
Dec(J2000) = +71d 48' 38.4"
This position is 44.6 arcseconds from the BAT position, 2.5 arcseconds
from the XRT position given in GCN4644 and 2.4 arcseconds from the
optical counterpart position given in GCN4645 (Malesani et al). We
estimate an uncertainty of 4 arcseconds radius (90% containment).
The 0.2-10 keV light curve in Photon Counting (PC) mode starts 3100
seconds from the BAT trigger (T0). The lightcurve shows evidence of a
shallow decay index of 0.6.
A preliminary spectral fit to the PC data gives a spectral power law
photon index of 2.24 � 0.3 in the 0.2-10 keV band with NH of 1.9e21 �
7e20, above the galactic NH value for this direction of 6e20. The
unabsorbed 0.2-10 keV flux at the start of the XRT observation is
estimated to be about 1E-11 erg/cm2/s. If the current decay slope
continues, we predict an unabsorbed 0.2-10 keV flux of about 1e-12
erg/cm2/s at T+24hrs.
GCN Circular 4652
Subject
GRB 060203: RTT150 optical observations
Date
2006-02-04T07:39:42Z (19 years ago)
From
Irek Khamitov at TUG <irekk@tug.tug.tubitak.gov.tr>
I. Bikmaev, A.Galeev, N. Sakhibullin (KSU/AST)
I. Khamitov, Z. Aslan (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.),
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI)
report:
The field of XRT position of GRB 060203 (Swift BAT Trigger 180151,
Retter et al., GCN 4641, GCN 4644) was observed with Russian-Turkish
1.5-m telescope (RTT150, Bakyrlytepe, TUBITAK National Observatory,
Turkey) by using Andor CCD.
We made series of 30 sec exposures in Rc and V filters, and series
of 60 sec exposures in B-filter on February 04, 00:20 - 03:50 UT.
We confirm the presence of the fading optical transient found by
Malesani et al. (GCN 4645) and Genko et al. (GCN 4646) and
estimate its magnitudes (relative to R = 18.1, V = 18.7, and B = 19.6
of nearby USNO star U1575_02633321) on our co-added frames as follows:
Rc = 19.9 +-0.1 UT(mean) = 00:49 ( 54 min after the burst)
V = 22.3 +-0.3 UT(mean) = 01:33 ( 98 min )
B > 23 UT(mean) = 02:07 ( 2h 12 min)
Rc = 21.0 +-0.1 UT(mean) = 02:49 ( 2h 54 min)
V > 22.5 UT(mean) = 03:05 ( 3h 10 min)
By using our and published R magnitudes the estimated
power law decay slope is -0.90+/-0.04
(http://www.tug.tubitak.gov.tr/~irekk/grb/grb060203/grb060203.jpg)
The red spectrum of OT is supporting also by IR data of Bloom et al. (GCN 4648).
This message may be cited.
GCN Circular 4656
Subject
GRB 060203: Swift-BAT refined analysis
Date
2006-02-04T16:15:57Z (19 years ago)
From
Hans Krimm at NASA-GSFC <krimm@milkyway.gsfc.nasa.gov>
H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC),
J. Cannizzo (GSFC-UMBC), J. Cummings (GSFC/NRC), E. Fenimore (LANL),
N. Gehrels (GSFC), D. Hullinger (GSFC/UMD), C. Markwardt (GSFC/UMD),
D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC),
G. Sato (ISAS), M. Tashiro (Saitama U.), J. Tueller (GSFC)
on behalf of the Swift-BAT team:
Using the data set from T-299.0 to T+183.0 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 060203 (trigger #180151)
(Retter et al., 4641, Burrows et al., GCN 4644, Cummings et al., GCN 4649).
The BAT ground-calculated position is (RA,Dec) = 103.502, 71.838 deg
{06h 54m 0.5s,+71d 50' 15.9"} (J2000) +- 1.9 arcmin, (radius, sys+stat,
90% containment). The partial coding was 50%.
Based on the event data that we have, the mask-weighted light curve shows a
single broad peak lasting from T-20 to T+65 seconds. T90 (15-350 keV) is
60 +- 10 sec (estimated error including systematics). There is no evidence in
the rate data for emission after this peak. We note that according to the
flight log files, event data was cut off at T+183 seconds due to a
pre-planned slew.
The time-averaged spectrum from T-22.1 to T+45.7 is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.62 +- 0.23. The fluence in the 15-150 keV band is (8.5 +- 1.2) x
10^-07 erg/cm2. The 1-sec peak photon flux measured from T+25.92 sec
in the 15-150 keV band is (0.6 +- 0.2) ph/cm2/sec. All the quoted errors
are at the 90% confidence level.
GCN Circular 4680
Subject
GRB060203: WHT Z-band observations
Date
2006-02-05T23:28:39Z (19 years ago)
From
Evert Rol at U.Leicester <er45@star.le.ac.uk>
E. Rol (U. of Leicester), A. Levan (U. of Hertsfordshire), K. Wiersema
(U. of Amsterdam), P. Dobbie, D. Boyce (U. of Leicester), N. Tanvir
(U. of Hertsfordshire) report on behalf of a larger collabration:
We have observed the optical counterpart of GRB060203 (Malesani, GCN
4645) with the Auxiliary Port Imaging Camera on the William Herschel
Telescope. We obtained two epochs of observations in Z-band. Our
results of seeing-matched aperture photometry are tabulated below:
time since burst exposure time seeing magnitude
(hours) (seconds) (arcsec)
4.0 5 x 240 0.8 19.75
22.8 5 x 240 0.7 21.60
The statistical error on the magnitude is typically 0.01, while we
estimate the zeropoint calibration error to be 0.3 magnitudes.
We thus measure a decay for the optical counterpart of 1.85 +/- 0.01
magnitude over 18.8 hours, with an average decay index of 0.98 +/- 0.01.
GCN Circular 4714
Subject
GRB 060203: Swift/UVOT upper limits
Date
2006-02-08T14:52:08Z (19 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
P. Schady (PSU/UCL-MSSL), A. Retter (PSU), P. Brown (PSU), D. Vanden. Berk
(PSU), F. Marshall (GSFC), N. Gehrels (GSFC) on behalf of the Swift/UVOT
team report:
The Swift/UVOT began taking data on the field of GRB 060203 at
00:45:26 UT on 2006-02-04, approximately 50mins after the BAT trigger (Retter
et al., GCN 4641). No afterglow candidate is detected in the summed images of
any filter, either within the refined XRT error circle (Morris et al., GCN
4651) or at the position reported by Malesani et al. (GCN 4645) down to the
following 3-sigma magnitude upper limits:
Filter T_range(s) Exp(s) 3sigUL(mag)
V 2976-27952 2618 20.7
B 5392-46016 4005 21.9
U 9808-51808 2952 21.4
UVW1 9600-51072 2516 20.7
UVM2 9392-50160 2829 21.0
UVW2 8976-34464 3816 21.4
White 8784-40240 3121 21.9
These magnitudes are uncorrected for Galactic extinction;
E(B-V) = 0.158.