GRB 060413
GCN Circular 4957
Subject
GRB 060413: Swift detection of a burst
Date
2006-04-13T19:29:00Z (19 years ago)
From
Jamie A. Kennea at PSU/Swift-XRT <kennea@astro.psu.edu>
C. Pagani (PSU), S. D. Barthelmy (GSFC), D. N. Burrows (PSU),
J. R. Cummings (NASA/ORAU), A. D. Falcone (PSU),
S. D. Hunsberger (PSU), J. A. Kennea (PSU), D. M. Palmer (LANL) and
P. Romano (INAF-OAB) report on behalf of the Swift Team:
BAT detected a GRB at 18:40:24. The BAT in-flight position is
RA, Dec 291.300d, +13.808d (J2000). There were no immediate
notices because the TDRSS link was down at the time. No
information is available about the light curve until the
full data arrive in about an hour.
XRT began observing at 18:42:19UT, 115 seconds after the BAT trigger.
XRT centroided on a bright, fading, uncatalogued X-ray point source at the
following coordinates:
RA(J2000): 19 25 07.5
Dec(J2000): +13 45 26.4
with an estimated uncertainty of 5 arcsec radius (90% containment).
This position is 194 arcseconds from the BAT position. The estimated flux
from this burst is 1.0E-8 erg/s/cm^2 (0.2-10 keV). Note that the flux in
the GCN XRT position notice was underestimated by a factor of 10.
The UVOT took a V finding chart. Only raw data (no coordinates) are
available at this time. Further results will be available following
the full data download.
GCN Circular 4958
Subject
GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
Date
2006-04-13T20:55:46Z (19 years ago)
From
Stephen Holland at USRA/NASA/GSFC/SSC <sholland@milkyway.gsfc.nasa.gov>
GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
Padi Boyd (GRFC), R. E. Weigand (GSFC), Stephen T. Holland (GSFC/USRA)
and Alex Blustin (MSSL) report on behalf of the Swift/UVOT team:
UVOT took a finding chart exposure of GRB 060413 (Pagani et
al. 2006, GCN Circular 4957). The exposure length was 400 seconds
with the V filter starting 960 seconds after the BAT trigger. No
afterglow candidate has been found in the initial data products. The
2.7'x2.7' sub-image covers the entire XRT error circle. The 3-sigma
upper limit inside the XRT error circle is 19.2 mag. We note that
this GRB occurred at a Galactic latitude of -1.04 degrees and the
estimated Galactic reddening along this line of sight is E_{B-V} =
1.95 mag (Schlegel et al. 1998).
GCN Circular 4959
Subject
GRB 060413: XRT refined analysis
Date
2006-04-14T00:03:35Z (19 years ago)
From
Claudio Pagani at PSU/Swift-XRT <pagani@astro.psu.edu>
C. Pagani, D. Morris, J. Racusin, J. Kennea and D. N. Burrows (PSU)
report on behalf of the Swift XRT team:
We have analysed the first orbit of Swift XRT data on the BAT GRB 060413
(Pagani, et al., GCN 4957) with a total exposure of 1700 seconds.
The refined XRT position is:
RA(J2000): 19 25 07.7
Dec(J2000): +13 45 27.3
This position is 192 arcseconds from the BAT position
and 4 arcsec from the XRT position given in GCN 4957.
We estimate an uncertainty of 3.6 arcseconds radius (90% containment).
The 0.2-10 keV light curve starts in Windowed Timing (WT) mode
119 seconds after the BAT trigger (T0) and then switches into Photon Counting
(PC) at T0+305.
The XRT data show a steep power law decay with slope of -3.5 +/- 0.2
followed by a flare centered at T0+646 seconds with a peak count rate of
6 counts/s.
The X-ray spectrum covering the time period from T+119s to T+1840s is
well fit by an absorbed power-law with a photon index of 1.9+/-0.1 and a
column density of 2.30e22 cm-2, which is higher than the Galactic value
in the direction of the source (1.20e22 cm-2). However, the NH measurement of
this galactic plane line of sight is likely to be underestimated.
The unabsorbed 0.3-10 keV flux is 4.8e-09 erg/cm**2/s.
Due to the flare in the light curve the predicted XRT count rate is uncertain.
Extrapolating the late part of the lightcurve of the first orbit we estimate
the XRT count rate to be about 0.0006 cps at T+24 hr, corresponding to an
unabsorbed 0.3-10 keV flux of about 1.6E-13 erg/cm2/s
This circular is an official product of the Swift XRT Team.
GCN Circular 4960
Subject
GRB 060413: Watcher UBVR observations
Date
2006-04-14T00:25:16Z (19 years ago)
From
Petr Kubanek at AIO <petr@lascaux.asu.cas.cz>
J.French, G.Melady, L.Hanlon, B.McBreen, S.McBreen (University College
Dublin, Ireland), P.Meintjes, M.Hoffman, H.Calitz (University of the
Free State, South Africa), N.Smith (Cork Institute of Technology,Ireland),
M.Jelinek, A. de Ugarte Postigo, A.J. Castro-Tirado (IAA, Granada),
R.Hudec (ASU AV CR Ondrejov) and P.Kubanek (ASU AV CR Ondrejov & ISDC,
Versoix)
reports
under control of RTS2, and using JIBARO astrometry package, Watcher
telescope, located at Boyden Observatory, South Africa, observed XRT
location of GRB 060413 (GCN 4958). Observation at UBVR filters started
at high airmass at 23:10 UT, e.g. 4 h 13 m after GRB. Preliminary
analysis of single 60 seconds R exposure doesn't shown any new object
down to 16.5 magnitude.
Observation is continuing. Watcher telescope is currently in
commissioning phase.
This message can be quoted.
GCN Circular 4961
Subject
GRB 060413: Refined analysis of the Swift-BAT burst
Date
2006-04-14T00:48:30Z (19 years ago)
From
Louis M Barbier at NASA/GSFC/Swift <lmb@cosmicra.gsfc.nasa.gov>
L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC),
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), C. Pagani (PSU),
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 data set from T-239 to T+510 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 060413 (trigger #205096)
(Pagani, et al., GCN 4957). The BAT ground-calculated position is RA,Dec =
291.288,+13.746 deg {19h 25m 9.2s,+13d 44' 45.5"} (J2000) +- 1.9 arcmin,
(radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted lightcurve shows a slow rise starting at ~T+20
to a cusp-like double peak, then followed by a slow decay
ending at ~T+220 sec. T90 (15-350 keV) is 150 +- 10 sec
(estimated error including systematics).
The time-averaged spectrum from T+29.6 to T+257.1 is best fit by
a simple power-law model. The power law index of the time-averaged
spectrum is 1.67 +- 0.08. The fluence in the 15-150 keV band is
3.6 +- 0.1 x 10-06 erg/cm2. The 1-sec peak photon flux measured
from T+90.16 sec in the 15-150 keV band is 0.9 +- 0.1 ph/cm2/sec.
All the quoted errors are at the 90% confidence level.
GCN Circular 4963
Subject
GRB 060413: REM NIR Observations
Date
2006-04-14T14:36:05Z (19 years ago)
From
Daniele Malesani at SISSA-ISAS,Trieste,Italy <malesani@sissa.it>
S.D. Vergani, P. D'Avanzo, E. Molinari, P. Romano, G. Chincarini, F.M. Zerbi,
S. Covino, V. Testa, G. Tosti, F. Vitali, L.A. Antonelli, P. Conconi, G.
Cutispoto, G. Malaspina, L. Nicastro, E. Palazzi, E. Meurs, P. Goldoni,
report on behalf of the REM/ROSS team:
We imaged the field of GRB 060413 (Pagani et al., GCN4957) with the
robotic 60-cm REM telescope located at La Silla (Chile). Observations
were performed in the near infrared (J, H, K, z bands) starting on 2006
Apr 14th at 07:58:12.5 UT and ending at 08:38:34.3 UT (approximately 13
hours after the burst). Observations in each filter lasted 300 s. Inside
the XRT error circle (Pagani et al., GCN4959), we find a single source,
which is visible also in the 2MASS survey. Its magnitudes are consistent
with the 2MASS values.
The 3-sigma limiting magnitudes are:
K=14.7
H=15.2
This message is citeable.
[GCN OPS NOTE(14apr06): Per author's request, Romano was added to the author list.]
GCN Circular 4964
Subject
GRB060413: Swift/UVOT upper limits
Date
2006-04-14T14:54:26Z (19 years ago)
From
Alexander Blustin at MSSL-UCL <ajb@mssl.ucl.ac.uk>
A. J. Blustin (UCL-MSSL), C. Pagani (PSU), J. Kennea (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began taking data on the field of GRB060413 at
2006-04-13T18:42:28, 124 s after the BAT trigger (Pagani et al.,
GCN 4957). No afterglow candidate was detected at the refined
XRT position (Pagani et al., GCN 4959) in summed images from
any of the filters down to the following three-sigma upper
limits.
Filter T_range(s) Exp(s) 3sig_UL
V 230-11744 1960 19.96
B 707-24977 2014 20.90
U 683-24287 2262 20.80
UVW1 660-23374 2118 20.14
UVM2 635-12648 1378 20.23
UVW2 735-7623 388 19.74
White 124-19078 1220 20.74
These upper limits are uncorrected for the estimated Galactic
reddening of E_{B-V} = 1.95 mag (Schlegel et al. 1998); we
estimate the V-band extinction A_v to be 6.24 magnitudes in this
direction.
GCN Circular 5160
Subject
GRB 060413 : WIDGET simultaneous optical observations
Date
2006-05-24T08:26:32Z (19 years ago)
From
Toru Tamagawa at RIKEN <tamagawa@riken.jp>
M. Kuwahara (TUS/RIKEN), M. Tashiro, Y. Urata, K. Abe, K. Onda,
N. Kodaka, K. Masuno (Saitama-U), F. Usui (ISAS/JAXA), T. Tamagawa
(RIKEN) on behalf of the WIDGET collaboration report:
"We have observed the entire error region of the Swift GRB 060413
(Pagani et al., GCN 4957, 4959) with the very wide-field camera,
WIDGET, located at Akeno, Japan. WIDGET has continuously monitored
the Swift Field-of-View with repeat of unfiltered 5-second exposures
between 26 seconds before and 335 seconds after the burst. The 1-sigma
limiting magnitude of each frame derived by the Tycho-2 catalog was
around V=10 mag. There was no significant emission from the X-ray
afterglow position up to the limiting magnitudes."
This message may be cited.