- Warning: the sequence of GCN messages was screwed up by our mail system.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 07 Feb 08 21:31:40 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 302728, Seg_Num: 0
GRB_RA: 207.513d {+13h 50m 03s} (J2000),
207.614d {+13h 50m 27s} (current),
206.890d {+13h 47m 33s} (1950)
GRB_DEC: +7.514d {+07d 30' 50"} (J2000),
+7.474d {+07d 28' 26"} (current),
+7.762d {+07d 45' 41"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 0 [cnts] Image_Peak=3860 [image_cnts]
TRIGGER_DUR: 64.000 [sec]
TRIGGER_INDEX: 20000 E_range: 15-50 keV
BKG_INTEN: 0 [cnts]
BKG_TIME: 0.00 SOD {00:00:00.00} UT
BKG_DUR: 0 [sec]
GRB_DATE: 14503 TJD; 38 DOY; 08/02/07
GRB_TIME: 77421.44 SOD {21:30:21.44} UT
GRB_PHI: -1.59 [deg]
GRB_THETA: 10.07 [deg]
SOLN_STATUS: 0x13
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 15.83 [sigma]
MERIT_PARAMS: +1 +0 +0 +6 +1 +4 +0 +0 +41 +1
SUN_POSTN: 320.91d {+21h 23m 40s} -15.29d {-15d 17' 14"}
SUN_DIST: 114.37 [deg] Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN: 329.85d {+21h 59m 25s} -12.39d {-12d 23' 27"}
MOON_DIST: 122.99 [deg]
MOON_ILLUM: 1 [%]
GAL_COORDS: 340.93, 65.96 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 202.72, 17.59 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Coordinates.
COMMENTS: This is an image trigger. (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)
COMMENTS: A point_source was found.
COMMENTS: This does not match any source in the on-board catalog.
COMMENTS: This does not match any source in the ground catalog.
COMMENTS: This is a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 98.39,-5.87 [deg].
- red DSS finding chart
ps-file
- GCN Circular #7264
J. L. Racusin (PSU), S. D. Barthelmy (GSFC),
W. H. Baumgartner (GSFC/UMBC), P. J. Brown (PSU),
D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC),
P. A. Evans (U Leicester), S. D. Hunsberger (PSU),
J. A. Kennea (PSU), C. B. Markwardt (CRESST/GSFC/UMD),
F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester),
D. M. Palmer (LANL), T. Sakamoto (NASA/UMBC),
R. L. C. Starling (U Leicester), M. C. Stroh (PSU) and
T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 21:30:21 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 080207 (trigger=302728). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 207.513, +7.514 which is
RA(J2000) = 13h 50m 03s
Dec(J2000) = +07d 30' 50"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). This was an image-trigger, so the TDRSS
lightcurve show little activity.
The XRT began observing the field at 21:32:25 UT, 124 seconds after the
BAT trigger. XRT found a bright, uncatalogued X-ray source
located at RA, Dec 207.5117, +7.5018 which is
RA(J2000) = 13h 50m 02.8s
Dec(J2000) = 07d 30' 06.4"
with an uncertainty of 4.7 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 8.2e-09 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 55 seconds with the White
(160-650 nm) filter starting 140 seconds after the BAT trigger. No
afterglow candidate has been found in the initial data products. The
3 sigma upper limit at the XRT position is white > 20. No correction
has been made for the expected extinction corresponding to E(B-V) of
0.02.
Burst Advocate for this burst is J. L. Racusin (racusin AT astro.psu.edu).
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 NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 07 Feb 08 21:35:40 UT
NOTICE_TYPE: Swift-UVOT Processed Image
TRIGGER_NUM: 302728, Seg_Num: 0
POINT_RA: 207.506d {+13h 50m 01s} (J2000)
POINT_DEC: +7.511d {+07d 30' 40"} (J2000)
ROLL: 103.415d
IMG_START_DATE: 14503 TJD; 38 DOY; 08/02/07
IMG_START_TIME: 77561.31 SOD {21:32:41.31} UT, 139.9 [sec] since BAT Trigger Time
FILTER: 10, White
EXPOSURE_ID: 224112763
X_OFFSET: 879 [pixels]
Y_OFFSET: 903 [pixels]
WIDTH: 160 [pixels]
HEIGHT: 160 [pixels]
X_GRB_POS: 1039
Y_GRB_POS: 1063
BINNING_INDEX: 1
IM_URL: sw00302728000msuni0139.fits
SUN_POSTN: 320.92d {+21h 23m 40s} -15.29d {-15d 17' 11"}
SUN_DIST: 114.38 [deg] Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN: 329.89d {+21h 59m 33s} -12.37d {-12d 22' 29"}
MOON_DIST: 123.03 [deg]
MOON_ILLUM: 1 [%]
GAL_COORDS: 340.92, 65.96 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 202.71, 17.58 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Processed Image.
COMMENTS: The GRB Position came from the XRT Position Command.
COMMENTS: The image has 2x2 binning (compression).
COMMENTS: If you have elected to receive attachments:
COMMENTS: The uvot_sources_image.fits.gz file does not exist; skipping the attachment.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 07 Feb 08 21:34:16 UT
NOTICE_TYPE: Swift-UVOT Source List
TRIGGER_NUM: 302728, Seg_Num: 0
POINT_RA: 207.506d {+13h 50m 01s} (J2000)
POINT_DEC: +7.511d {+07d 30' 40"} (J2000)
POINT_ROLL: 103.415d
IMG_START_DATE: 14503 TJD; 38 DOY; 08/02/07
IMG_START_TIME: 77561.31 SOD {21:32:41.31} UT, 139.9 [sec] since BAT Trigger Time
FILTER: 10, White
BKG_MEAN: 0.899
N_STARS: 27
X_OFFSET: 559 [pixels]
Y_OFFSET: 583 [pixels]
X_MAX: 1518 [pixels]
Y_MAX: 1542 [pixels]
DET_THRESH: 8
PHOTO_THRESH: 4
SL_URL: sw00302728000msufc0139.fits
SUN_POSTN: 320.92d {+21h 23m 40s} -15.29d {-15d 17' 12"}
SUN_DIST: 114.38 [deg] Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN: 329.88d {+21h 59m 30s} -12.38d {-12d 22' 49"}
MOON_DIST: 123.02 [deg]
MOON_ILLUM: 1 [%]
GAL_COORDS: 340.92, 65.96 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 202.71, 17.58 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Source List.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 07 Feb 08 21:33:04 UT
NOTICE_TYPE: Swift-XRT Image
TRIGGER_NUM: 302728, Seg_Num: 0
GRB_RA: 207.5117d {+13h 50m 02.8s} (J2000),
207.6128d {+13h 50m 27.0s} (current),
206.8882d {+13h 47m 33.1s} (1950)
GRB_DEC: +7.5018d {+07d 30' 06.4"} (J2000),
+7.4618d {+07d 27' 42.5"} (current),
+7.7494d {+07d 44' 57.9"} (1950)
GRB_ERROR: 4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN: 217 [cnts]
IMG_START_DATE: 14503 TJD; 38 DOY; 08/02/07
IMG_START_TIME: 77545.49 SOD {21:32:25.49} UT, 124.1 [sec] since BAT Trigger Time
CENTROID_X: 290.39, raw= 290 [pixels]
CENTROID_Y: 286.02, raw= 286 [pixels]
ROLL: 103.42 [deg]
GAIN: 2
MODE: 3, Long Image mode
WAVEFORM: 134
EXPO_TIME: 2.50 [sec]
GRB_POS_XRT_Y: -28.22
GRB_POS_XRT_Z: -28.07
IMAGE_URL: sw00302728000msxps_rw.img
SUN_POSTN: 320.92d {+21h 23m 40s} -15.29d {-15d 17' 13"}
SUN_DIST: 114.37 [deg] Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN: 329.87d {+21h 59m 28s} -12.39d {-12d 23' 06"}
MOON_DIST: 123.00 [deg]
MOON_ILLUM: 1 [%]
GAL_COORDS: 340.92, 65.95 [deg] galactic lon,lat of the burst
ECL_COORDS: 202.72, 17.58 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Image.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 07 Feb 08 21:33:10 UT
NOTICE_TYPE: Swift-XRT Processed Image
TRIGGER_NUM: 302728, Seg_Num: 0
GRB_RA: 207.5117d {+13h 50m 02.8s} (J2000),
207.6128d {+13h 50m 27.0s} (current),
206.8882d {+13h 47m 33.1s} (1950)
GRB_DEC: +7.5018d {+07d 30' 06.4"} (J2000),
+7.4618d {+07d 27' 42.5"} (current),
+7.7494d {+07d 44' 57.9"} (1950)
GRB_ERROR: 4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN: 217 [cnts]
IMG_START_DATE: 14503 TJD; 38 DOY; 08/02/07
IMG_START_TIME: 77545.49 SOD {21:32:25.49} UT, 124.1 [sec] since BAT Trigger Time
CENTROID_X: 290.39, raw= 290 [pixels]
CENTROID_Y: 286.02, raw= 286 [pixels]
ROLL: 103.42 [deg]
GAIN: 2
MODE: 3, Long Image mode
WAVEFORM: 134
EXPO_TIME: 2.50 [sec]
GRB_POS_XRT_Y: -28.22
GRB_POS_XRT_Z: -28.07
IMAGE_URL: sw00302728000msxps_rw.img
SUN_POSTN: 320.92d {+21h 23m 40s} -15.29d {-15d 17' 13"}
SUN_DIST: 114.37 [deg] Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN: 329.87d {+21h 59m 28s} -12.38d {-12d 23' 05"}
MOON_DIST: 123.00 [deg]
MOON_ILLUM: 1 [%]
GAL_COORDS: 340.92, 65.95 [deg] galactic lon,lat of the burst
ECL_COORDS: 202.72, 17.58 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Processed Image.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 07 Feb 08 21:32:54 UT
NOTICE_TYPE: Swift-XRT Position
TRIGGER_NUM: 302728, Seg_Num: 0
GRB_RA: 207.5117d {+13h 50m 02.8s} (J2000),
207.6128d {+13h 50m 27.0s} (current),
206.8882d {+13h 47m 33.1s} (1950)
GRB_DEC: +7.5018d {+07d 30' 06.4"} (J2000),
+7.4618d {+07d 27' 42.5"} (current),
+7.7494d {+07d 44' 57.9"} (1950)
GRB_ERROR: 4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN: 8.17e-09 [erg/cm2/sec]
GRB_SIGNIF: 14.73 [sigma]
IMG_START_DATE: 14503 TJD; 38 DOY; 08/02/07
IMG_START_TIME: 77545.49 SOD {21:32:25.49} UT, 124.1 [sec] since BAT Trigger Time
TAM[0-3]: 327.64 237.24 261.32 243.58
AMPLIFIER: 2
WAVEFORM: 134
SUN_POSTN: 320.92d {+21h 23m 40s} -15.29d {-15d 17' 13"}
SUN_DIST: 114.37 [deg] Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN: 329.87d {+21h 59m 28s} -12.39d {-12d 23' 09"}
MOON_DIST: 123.00 [deg]
MOON_ILLUM: 1 [%]
GAL_COORDS: 340.92, 65.95 [deg] galactic lon,lat of the burst
ECL_COORDS: 202.72, 17.58 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Coordinates.
COMMENTS: The object found at this position is either a very bright burst or a cosmic ray hit.
COMMENTS: Examine the XRT Image to differentiate (CRs are much more compact); see examples at:
COMMENTS: http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 07 Feb 08 21:35:32 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 302728, Seg_Num: 0
GRB_RA: 207.513d {+13h 50m 03s} (J2000),
207.614d {+13h 50m 27s} (current),
206.890d {+13h 47m 33s} (1950)
GRB_DEC: +7.514d {+07d 30' 50"} (J2000),
+7.474d {+07d 28' 26"} (current),
+7.762d {+07d 45' 41"} (1950)
GRB_DATE: 14503 TJD; 38 DOY; 08/02/07
GRB_TIME: 77421.44 SOD {21:30:21.44} UT
TRIGGER_INDEX: 20000
GRB_PHI: -1.59 [deg]
GRB_THETA: 10.07 [deg]
DELTA_TIME: 0.00 [sec]
TRIGGER_DUR: 64.000 [sec]
SOLN_STATUS: 0x13
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 15.83 [sigma]
LC_URL: sw00302728000msb.lc
SUN_POSTN: 320.92d {+21h 23m 40s} -15.29d {-15d 17' 11"}
SUN_DIST: 114.37 [deg] Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN: 329.89d {+21h 59m 33s} -12.38d {-12d 22' 31"}
MOON_DIST: 123.02 [deg]
MOON_ILLUM: 1 [%]
GAL_COORDS: 340.93, 65.96 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 202.72, 17.59 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Lightcurve.
COMMENTS:
COMMENTS: The next comments were copied from the BAT_POS Notice:
COMMENTS: This is an image trigger.
COMMENTS: A point_source was found.
COMMENTS: This does not match any source in the on-board catalog.
COMMENTS: This does not match any source in the ground catalog.
COMMENTS: This is a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 98.39,-5.87 [deg].
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 07 Feb 08 21:34:47 UT
NOTICE_TYPE: Swift-UVOT Processed Source List
TRIGGER_NUM: 302728, Seg_Num: 0
POINT_RA: 207.506d {+13h 50m 01s} (J2000)
POINT_DEC: +7.511d {+07d 30' 40"} (J2000)
POINT_ROLL: 103.415d
IMG_START_DATE: 14503 TJD; 38 DOY; 08/02/07
IMG_START_TIME: 77561.31 SOD {21:32:41.31} UT, 139.9 [sec] since BAT Trigger Time
FILTER: 10, White
BKG_MEAN: 0.899
N_STARS: 27
X_OFFSET: 559 [pixels]
Y_OFFSET: 583 [pixels]
X_MAX: 1518 [pixels]
Y_MAX: 1542 [pixels]
DET_THRESH: 8
PHOTO_THRESH: 4
SL_URL: sw00302728000msufc0139.fits
SUN_POSTN: 320.92d {+21h 23m 40s} -15.29d {-15d 17' 11"}
SUN_DIST: 114.38 [deg] Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN: 329.88d {+21h 59m 32s} -12.38d {-12d 22' 42"}
MOON_DIST: 123.03 [deg]
MOON_ILLUM: 1 [%]
GAL_COORDS: 340.92, 65.96 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 202.71, 17.58 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Processed Source List.
COMMENTS: All 4 attachments are included.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 07 Feb 08 21:35:19 UT
NOTICE_TYPE: Swift-UVOT Image
TRIGGER_NUM: 302728, Seg_Num: 0
POINT_RA: 207.506d {+13h 50m 01s} (J2000)
POINT_DEC: +7.511d {+07d 30' 40"} (J2000)
ROLL: 103.415d
IMG_START_DATE: 14503 TJD; 38 DOY; 08/02/07
IMG_START_TIME: 77561.31 SOD {21:32:41.31} UT, 139.9 [sec] since BAT Trigger Time
FILTER: 10, White
EXPOSURE_ID: 224112763
X_OFFSET: 879 [pixels]
Y_OFFSET: 903 [pixels]
WIDTH: 160 [pixels]
HEIGHT: 160 [pixels]
X_GRB_POS: 1039
Y_GRB_POS: 1063
BINNING_INDEX: 1
IM_URL: sw00302728000msuni0139.fits
SUN_POSTN: 320.92d {+21h 23m 40s} -15.29d {-15d 17' 11"}
SUN_DIST: 114.38 [deg] Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN: 329.89d {+21h 59m 33s} -12.38d {-12d 22' 34"}
MOON_DIST: 123.03 [deg]
MOON_ILLUM: 1 [%]
GAL_COORDS: 340.92, 65.96 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 202.71, 17.58 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Image.
COMMENTS: The GRB Position came from the XRT Position Command.
COMMENTS: The image has 2x2 binning (compression).
- GCN Circular #7265
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)
report on behalf of the Swift-XRT team.
Using 199 s of overlapping XRT Photon Counting mode and UVOT
V-band data for GRB 080207, 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 = 207.51253, +7.50245 which is equivalent
RA (J2000): 13h 50m 3.01s
Dec (J2000): +07d 30' 08.8"
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, astro-ph/0708.0986
http://www.swift.ac.uk/xrt_positions/Goad.pdf).
This circular was automatically generated, and is an official product of the
Swift-XRT team.
- GCN Circular #7266
J. L. Racusin (PSU) reports on behalf of the Swift-XRT Team:
We have analysed the first 4 orbits of Swift-XRT data obtained for GRB
080207 (Racusin et al. GCN Circ. 7264), totaling 64 s of Windowed Timing
(WT) data and 5.7 ks of Photon Counting (PC) data. The enhanced XRT
position is given in Beardmore et al. (GCN 7265).
The X-ray light-curve can be fit by a broken power-law with an initial
bright short flat phase with a a break at 205 +/- 73 sec followed by a
power-law with a decay slope of 1.5 +/- 0.1.
The WT data (133-197 seconds) can be modeled as an absorbed power-law with
photon index of 1.1 +/- 0.1 and a total absorbing column of NH = (85 +/-
10)e20 cm^-2. The PC data (4.7-17.1 ks) can be modeled as an absorbed
power-law with photon index of 2.4 +/- 0.2 and a total absorbing column of
NH = (75 +/- 17)e20 cm^-2. Both fits are in excess of the Galactic value
of 1.95e20 cm^-2. The 0.3-10 keV observed (unabsorbed) flux during this
time is 5.80e-9 (5.81e-9) erg cm^-2 s^-1 and 1.15e-11 (1.16e-11) erg cm^-2
s^-1 for WT and PC, respectively.
Assuming the source continues to decay with the same decay index of 1.5,
we predict an XRT count rate of 7.6e-3 counts/s at T+24 hours, which
corresponds to an 0.3-10.0 keV observed flux of 6.6e-13 ergs cm^-2 s^-1.
This circular is an official product of the Swift-XRT team.
- GCN Circular #7267
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 080207 detected by SWIFT
(trigger 302728) with the TAROT robotic telescope (D=3D25cm)
located at the Calern observatory, France.
Although the notice was received 100s after the trigger,
the observations started 1075s later
because the field was not risen at Calern during the burst.
First images are two low in elevation.
Stars become detectable on images ~1500s after the trigger.
Weather conditions were excellents.
The date of trigger : t0 =3D 2008-02-07T21:30:21
No afterglow was found at position delivered by
Beardmore et al. (GCNC 7265):
t0+1563s to t0+1653s : R > 14.3 (elevation 2.5=B0)
t0+1670s to t0+1760s : R > 14.9 (elevation 2.8=B0)
t0+3388s to t0+3568s : R > 16.2 (elevation 8=B0)
t0+3388s to t0+7526s : R > 19.0 (elevation 20=B0)
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.
This message may be cited.
- GCN Circular #7268
A. Cucchiara (PSU), J. Racusin (PSU)
report on behalf of the Swift-UVOT team:
The Swift/UVOT observed the field of GRB080207 (trigger #302728)
starting 55 sec days after the BAT detection (Racusin et
al. 2008, GCN Circ. 7264). We do not find any new source in any
of the UVOT coadded observations inside the XRT enhanced error
circle (Beardmore et al. 2008, GCN Circ. 7265).
The 3-sigma upper limits (in the UVOT photometric system,
Breeveld et al., GCN Circ. 6614) are listed.
Filter Tstart Tstop Exp Upper limit
(s) (s) (s)
white 55 11428 1167 22.40
v 4733 13063 1097 20.50
b 5553 16909 983 21.53
u 5347 6982 393 20.57
uvw1 5143 6777 393 20.75
uvm2 4937 6572 393 20.58
uvw2 5963 12334 1082 21.62
The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E_{B-V} = 0.02 mag in the
direction of the burst (Schlegel et al. 1998).
- GCN Circular #7269
P. D'Avanzo, L.A. Antonelli, S. Covino, D. Fugazza, L. Calzoletti, S.
Campana, G. Chincarini, M.L. Conciatore, S. Cutini, V. D'Elia, F.
Dalessio, F. Fiore, P. Goldoni, D. Guetta, C. Guidorzi, G.L. Israel,
N. Masetti, A. Melandri, E. Meurs, L. Nicastro, E. Palazzi, E. Pian, S.
Piranomonte, L. Stella, G. Stratta, G. Tagliaferri, G. Tosti, V.Testa,
S.D. Vergani, F. Vitali report on behalf of the REM team:
The robotic 60-cm REM telescope located at La Silla (Chile) observed
automatically the field of the GRB 080207 (Racusin et al., GCN 7264). A
preliminary analysis of the first set of JHK exposures does not reveal
any optical afterglow candidate inside the XRT error box (Beardmore et
al., GCN 7265) We derive the following 3sigma upper limits (calibrated
against the 2MASS catalog):
J > 16.7 (7.8 hours after the burst)
H > 15.9 (7.7 hours after the burst)
K > 13.9 (10.1 hours after the burst)
- GCN Circular #7270
I. Khamitov (TUG), O. Kose, K.Yakut (Ege Uni.),
Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.)
I. Bikmaev, N. Sakhibullin (KSU/AST)
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
report:
We have observed field of the GRB080207 (trigger=302728, GCN Circ. 7264)
with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK
National Observatory, Turkey) 07 Feb between 22:04UT and 22:27UT, i.e.
starting about 34 min after the burst, using ANDOR CCD.
Series of 20*30sec direct images in Rc band were taken. We found no
afterglow candidate inside of XRT error circle. Using USNO-B1 stars we
estimated limiting magnitude of the co-added frame as R~21.8 mag.
The finding chart can be found at:
http://hea.iki.rssi.ru/grb/080207/indexeng.html
- GCN Circular #7272
M. Stamatikos (GSFC/ORAU), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC),
E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA),
C. Markwardt (GSFC/UMD), D. Palmer (LANL), J. L. Racusin (PSU),
T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), J. Tueller (GSFC),
T. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 080207 (trigger #302728)
(Racusin, et al., GCN Circ. 7264). The BAT ground-calculated position is
RA, Dec = 207.514, 7.492 deg which is
RA(J2000) = 13h 50m 3.3s
Dec(J2000) = 7d 29' 32"
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
The mask-weighted light curve shows a long smooth rise starting at ~T-20 sec,
peaking around T+100 sec, then dropping to a minimum around T+200 sec,
then rising again out to T+320 sec at which point the location went out
of the BAT FOV when the spacecraft slewed to a new target.
T90 (15-350 keV) is >300 sec (estimated error including systematics).
The time-averaged spectrum from T+4.7 to T+332.9 sec is best fit by a power law
with an exponential cutoff. This fit gives a photon index 1.17 +- 0.27,
and Epeak of 107.8 +- 72.5 keV (chi squared 51.31 for 56 d.o.f.). For this
model the total fluence in the 15-150 keV band is 6.1 +- 0.2 x 10^-06 erg/cm2
and the 1-sec peak flux measured from T+330.34 sec in the 15-150 keV band is
1.0 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index
of 1.58 +- 0.06 (chi squared 57.73 for 57 d.o.f.). All the quoted errors
are at the 90% confidence level.
The BAT characteristics of this burst, particularly the long smooth
lightcurve, suggest that it might be at high redshift, but the high
absorption of the XRT spectrum (Racusin et al. GCN 7266) make it unlikely.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/302728/BA/
- GCN Circular #7273
A. C. Updike (Clemson University), P. A. Milne (U Arizona), G. G.
Williams (MMTO), and D. H. Hartmann (CU) report on behalf of the
Super-LOTIS team:
The 0.6m Super-LOTIS telescope began observations of the field of GRB
080207 (Racusin et al., GCN 7264) approximately 13 hours and 16 min
after the trigger. Observations consisted of 58x60 second exposures in
the R band, under decent weather conditions.
No afterglow was detected within the XRT refined error circle (Beardmore
et al., GCN 7265) down to a limiting magnitude of 20.8 (as derived from
USNO B1.0 R2 magnitudes upon comparison to field stars).
This message may be cited.
- GCN Circular #7276
A. Cucchiara and D. B. Fox (PSU) reports on behalf of a larger
collaboration:
"We have imaged the field of GRB 080207 (Racusin et al., GCN 7264)
with the Gemini South + GMOS in griz bandds starting at 0.41 days
after the trigger.
We took a sequence of 5x 180s images in each band (total exposure
900s). Our co-added images do not reveal any source inside the XRT
refined error circle (Beardmore et al., GCN 7265). Using three
objects from the SDSS catalog to establish photometric zero-points, we
calculate the following 2-sigma upper limits on the emission of any
optical afterglow + host galaxy: g > 24.1 mag, r > 24.5 mag, i > 24.2
mag, z > 25.0 mag."
- GCN Circular #7277
M. Stamatikos (GSFC/ORAU), S. D. Barthelmy (GSFC),
J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL),
J. L. Racusin (PSU), T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS),
J. Tueller (GSFC), T. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 080207 (trigger #302728)
(Racusin, et al., GCN Circ. 7264). The BAT ground-calculated position
is RA, Dec = 207.514, 7.492 deg which is
RA(J2000) = 13h 50m 3.3s
Dec(J2000) = 7d 29' 32"
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
The mask-weighted light curve shows a long smooth rise starting at
~T-20 sec, peaking around T+100 sec, then dropping to a minimum around
T+200 sec, then rising again out to ~T+340 sec at which point the
location went out of the BAT FOV when the spacecraft slewed to a new
target. Based on the raw counting rates, which are somewhat sensitive
to photons through the side of the instrument, there was not significant
emission above about 50 keV after this time. T90 (15-350 keV) is
340 +- 20 sec (estimated error including systematics).
The time-averaged spectrum from T+4.7 to T+332.9 sec is best fit by a
power law with an exponential cutoff. This fit gives a photon index
1.17 +- 0.27, and Epeak of 107.8 +- 72.5 keV (chi squared 51.31 for
56 d.o.f.). For this model the total fluence in the 15-150 keV band is
6.1 +- 0.2 x 10^-06 erg/cm2 and the 1-sec peak flux measured from
T+330.34 sec in the 15-150 keV band is 1.0 +- 0.3 ph/cm2/sec. A fit to
a simple power law gives a photon index of 1.58 +- 0.06 (chi squared
57.73 for 57 d.o.f.). All the quoted errors are at the 90% confidence
level.
The BAT characteristics of this burst, particularly the long smooth
lightcurve, suggest that it might be at high redshift, but the high
absorption of the XRT spectrum (Racusin et al. GCN 7266) make it
unlikely.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/302728/BA/
- GCN Circular #7279
A. Kuepcue Yoldas, A. Yoldas, J. Greiner, T. Kruehler (all MPE Garching),
S. Klose (Tautenburg Obs), G. Szokoly (Budapest Univ.) report for the
GROND team:
We observed the field of GRB 080207 detected by Swift/BAT (Racusin et al.
2008, GCN 7264) simultaneously in grizJHK with GROND (Greiner et al. 2008,
astro-ph/0801.4801), mounted at the 2.2m MPI/ESO telescope at La Silla (Chile).
Observations started on Feb. 08, at 06:35 UT, about 9 hrs after the GRB,
under poor conditions (particularly high humidity and airmass of 1.7-1.34).
No source is detected within the 3-sigma XRT error circle (Beardmore et al.
2008, GCN 7265). Comparison of the co-added images (with 3440 sec effective
exposure time in griz and 2400 seconds in JHK) to the Digital Sky Survey
and 2MASS yields the following 3-sigma upper limits:
g' > 23.9, r' > 23.8, i' > 23.5, z' > 22.8, J > 21.0, H > 19.7, K > 19.0.
- GCN Circular #7291
V. Mu=F1oz Mar=EDn, J. Sabater, A.J. Castro-Tirado, J. Gorosabel, M.
Jel=EDnek (IAA-CSIC), A. de Ugarte Postigo (ESO, Santiago), report:
"We carried out BVRI-band observations of the GRB 080207 XRT enhanced
position of (Beardmore et al., GCN 7265) with the 2.5m NOT(+MOSCA) at
Roque de los Muchachos observatory. A preliminary analysis reveals no
optical source in the XRT error circle brighter than R~23.5 at Feb
8.26389-8.27778 UT (8.83 - 9.16 hours after the GRB)."
- GCN Circular #7293
D. Fugazza (INAF-OAB), V. D'Elia (INAF-OAR), P. D'Avanzo, S. Covino and
G. Tagliaferri (INAF-OAB) report, on behalf of the MISTICI collaboration:
We observed the field of GRB 080207 (Racusin et al., GCN 7264) with the
Very Large Telescope equipped with the SINFONI near infrared camera in
imaging mode. Observations have been carried out on Feb 08.3673, i.e.
about 11.3 hours after the burst and about 2 hours after the REM
(D'Avanzo et al., GCN 7269) and GROND (Kuepcue Yoldas et al. GCN 7279)
NIR observations. We do not detect any afterglow candidate inside the
XRT error box (Beardmore et al., GCN 7265). We derive the following
3sigma upper limits (calibrated against standard stars taken the same
night):
J > 23.5
H > 22.8
K > 21.5
We acknowledge support from the ESO staff.
- GCN Report 113.1
GCN_Report 113.1 has been posted:
http://gcn.gsfc.nasa.gov/reports/report_113_1.pdf
by J.L. Racusin
at PSU
titled: "Final Swift observations of GRB 080207"
- GCN Circular #7333
M. Andreev (Terskol Branch of Institute of Astronomy) V. Petkov, A. Kurenya
(BNO INR RAS), A. Pozanenko (IKI) on behalf of larger GRB follow up
collaboration report:
We observed the GRB080207 (Racusin et al. GCN 7264) with Zeiss-600 of
Mt.Terskol observatory on Feb.07-08. Two series in R-filter were completed.
We do not detect new sources within XRT error circle (Beardmore et al. GCN
7265). The limiting magnitudes against USNO-B1.0 are following:
UT, Exposure, R_mag
(mid time)
Feb.7.958 20 x 60s >20.3
Feb.8.102 40 x 90s >21.0
The message may be cited.
- 1106.3988 from 21 Jun 11
Leslie Hunt et al.: The extremely red host galaxy of GRB 080207
We present optical, near-infrared, and Spitzer IRAC and MIPS observations of the host galaxy of the dark gamma-ray burst GRB 080207. The host
is faint, with extremely red optical-infrared colors (R-K = 6.3, 24\micron/$R-$band flux $\sim1000$) making it an extremely red object
(ERO) and a dust-obscured galaxy (DOG). The spectral energy distribution (SED) shows the clear signature of the 1.6 micron photometric "bump",
typical of evolved stellar populations. We use this bump to establish the photometric redshift $z_{\rm phot}$ as 2.2$^{+0.2}_{-0.3}$, using a
vast library of SED templates, including M 82. The star-formation rate (SFR) inferred from the SED fitting is $\sim$119\msun\,yr$^{-1}$, the
stellar mass $3\times10^{11}$\,\msun, and \av\ extinction from 1-2\,mag. The ERO and DOG nature of the host galaxy of the dark GRB 080207 may
be emblematic of a distinct class of dark GRB hosts, with high SFRs, evolved and metal-rich stellar populations, and significant dust
extinction within the host galaxy.
- 1109.3167 from 14 Sep 11
Svensson et al.: The dark GRB080207 in an extremely red host and the implications for GRBs in highly obscured environments
We present comprehensive X-ray, optical, near- and mid-infrared, and sub-mm observations of GRB 080207 and its host galaxy. The afterglow was undetected in the optical and near-IR, implying an optical to X-ray index <0.3, identifying GRB 080207 as a dark burst. Swift X-ray observations show extreme absorption in the host, which is confirmed by the unusually large optical extinction found by modelling the X-ray to nIR afterglow spectral energy distribution. Our Chandra observations obtained 8 days post-burst allow us to place the afterglow on the sky to sub-arcsec accuracy, enabling us to pinpoint an extremely red galaxy (ERO). Follow-up host observations with HST, Spitzer, Gemini, Keck and the James Clerk Maxwell Telescope (JCMT) provide a photometric redshift solution of z ~1.74 (+0.05,-0.06) (1 sigma), 1.56 < z < 2.08 at 2 sigma) for the ERO host, and suggest that it is a massive and morphologically disturbed ultra-luminous infrared galaxy (ULIRG) system, with L_FIR ~ 2.4 x 10^12 L_solar. These results add to the growing evidence that GRBs originating in very red hosts always show some evidence of dust extinction in their afterglows (though the converse is not true -- some extinguished afterglows are found in blue hosts). This indicates that a poorly constrained fraction of GRBs occur in very dusty environments. By comparing the inferred stellar masses, and estimates of the gas phase metallicity in both GRB hosts and sub-mm galaxies we suggest that many GRB hosts, even at z>2 are at lower metallicity than the sub-mm galaxy population, offering a likely explanation for the dearth of sub-mm detected GRB hosts. However, we also show that the dark GRB hosts are systematically more massive than those hosting optically bright events, perhaps implying that previous host samples are severely biased by the exclusion of dark events.
- 1202.1434 from 8 Feb 12
A. Rossi et al.: A deep search for the host galaxies of GRBs with no detected optical afterglow
Gamma-Ray Bursts can provide information about star formation at high redshifts. Even in the absence of a optical/near-infrared/radio
afterglow, the high detection rate of X-ray afterglows by swift/XRT and its localization precision of 2-3 arcsec facilitates the identification
and study of GRB host galaxies. We focus on the search for the host galaxies of a sample of 17 bursts with XRT error circles but no detected
long-wavelength afterglow. Three of these events can also be classified as truly dark bursts: the observed upper limit on the optical flux of
the afterglow was less than expected based on the X-ray flux. Our study is based on deep R and K-band observations performed with ESO/VLT
instruments, supported by GROND and NEWFIRM. To be conservative, we searched for host galaxies in an area with a radius twice the 90% swift/XRT
error circle. For 15 of the 17 bursts we find at least one galaxy inside the doubled XRT error circle. In seven cases we discover extremely red
objects in the error circles. The most remarkable case is the host of GRB 080207 which as a colour of R-K~4.7 mag (AB), one of the reddest
galaxies ever associated with a GRB. As a by-product of our study we identify the optical afterglow of GRB 070517A. Optically dim afterglows
result from cosmological Lyman drop out and dust extinction, but the former process is only equired for a minority of cases (<1/3). Extinction
by dust in the host galaxies might explain all other events. Thereby, a seemingly non-negligible fraction of these hosts are globally
dust-enshrouded, extremely red galaxies. This suggests that bursts with optically dim afterglows trace a subpopulation of massive starburst
galaxies, which are markedly different from the main body of the GRB host galaxy population, namely the blue, subluminous, compact galaxies.
- New/revised redshift from the TOUGH project, in particular:
1205.3162
1205.3490
1205.3779
1205.4036
Previous IAU Circulars 