Gamma-ray Burst 080319C

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Mar 08 12:26:19 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     306778,   Seg_Num: 0
GRB_RA:          258.973d {+17h 15m 54s} (J2000),
                 259.013d {+17h 16m 03s} (current),
                 258.729d {+17h 14m 55s} (1950)
GRB_DEC:         +55.410d {+55d 24' 35"} (J2000),
                 +55.401d {+55d 24' 04"} (current),
                 +55.464d {+55d 27' 49"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       8789 [cnts]    Image_Peak=459 [image_cnts]
TRIGGER_DUR:     1.024 [sec]
TRIGGER_INDEX:   155     E_range: 50-350 keV
BKG_INTEN:       31829 [cnts]
BKG_TIME:        44741.34 SOD {12:25:41.34} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14544 TJD;    79 DOY;   08/03/19
GRB_TIME:        44756.96 SOD {12:25:56.96} UT
GRB_PHI:         -101.50 [deg]
GRB_THETA:        33.65 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     69.36 [sigma]
IMAGE_SIGNIF:    15.10 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3 +19  +0  +0 +10  +1
SUN_POSTN:       359.33d {+23h 57m 20s}   -0.29d {-00d 17' 18"}
SUN_DIST:         96.08 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      154.40d {+10h 17m 36s}  +10.02d {+10d 01' 06"}
MOON_DIST:        89.88 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:       83.35, 35.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      239.42, 77.67 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.
COMMENTS:        This is a rate 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 = 135.24,17.21 [deg].

red DSS finding chart ps-file

LI> GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Mar 08 12:29:25 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     306778,   Seg_Num: 0
GRB_RA:          258.973d {+17h 15m 54s} (J2000),
                 259.013d {+17h 16m 03s} (current),
                 258.729d {+17h 14m 55s} (1950)
GRB_DEC:         +55.410d {+55d 24' 35"} (J2000),
                 +55.401d {+55d 24' 04"} (current),
                 +55.464d {+55d 27' 49"} (1950)
GRB_DATE:        14544 TJD;    79 DOY;   08/03/19
GRB_TIME:        44756.96 SOD {12:25:56.96} UT
TRIGGER_INDEX:   155
GRB_PHI:         -101.50 [deg]
GRB_THETA:        33.65 [deg]
DELTA_TIME:      39.00 [sec]
TRIGGER_DUR:     1.024 [sec]
SOLN_STATUS:     0x3
RATE_SIGNIF:     69.36 [sigma]
IMAGE_SIGNIF:    15.10 [sigma]
LC_URL:          sw00306778000msb.lc
SUN_POSTN:       359.34d {+23h 57m 21s}   -0.29d {-00d 17' 15"}
SUN_DIST:         96.08 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      154.42d {+10h 17m 42s}  +10.01d {+10d 00' 21"}
MOON_DIST:        89.88 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:       83.35, 35.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      239.42, 77.67 [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 a rate 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 = 135.24,17.21 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Mar 08 12:29:48 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     306778,   Seg_Num: 0
POINT_RA:        258.952d {+17h 15m 49s} (J2000)
POINT_DEC:       +55.415d {+55d 24' 54"} (J2000)
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  44980.65 SOD {12:29:40.65} UT,   223.7 [sec] since BAT Trigger Time
COUNTS:          59    Min_needed= 20
STD_DEV:         37.08   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        3    Max_iter_allowed= 4
ERROR_CODE:      3
COMMENTS:        SWIFT-XRT Nack Position.
COMMENTS:        Standard deviation too large.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Mar 08 12:32:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     306778,   Seg_Num: 0
POINT_RA:        258.953d {+17h 15m 49s} (J2000)
POINT_DEC:       +55.415d {+55d 24' 54"} (J2000)
POINT_ROLL:      81.582d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  44983.87 SOD {12:29:43.87} UT,   226.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.051
N_STARS:         41
X_OFFSET:        585 [pixels]
Y_OFFSET:        542 [pixels]
X_MAX:           1544 [pixels]
Y_MAX:           1501 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00306778000msufc0226.fits
SUN_POSTN:       359.34d {+23h 57m 21s}   -0.29d {-00d 17' 11"}
SUN_DIST:         96.09 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      154.45d {+10h 17m 48s}   +9.99d {+09d 59' 34"}
MOON_DIST:        89.86 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:       83.36, 35.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      239.36, 77.68 [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:     Wed 19 Mar 08 12:32:06 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     306778,   Seg_Num: 0
POINT_RA:        258.953d {+17h 15m 49s} (J2000)
POINT_DEC:       +55.415d {+55d 24' 54"} (J2000)
POINT_ROLL:      81.582d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  44983.87 SOD {12:29:43.87} UT,   226.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.051
N_STARS:         41
X_OFFSET:        585 [pixels]
Y_OFFSET:        542 [pixels]
X_MAX:           1544 [pixels]
Y_MAX:           1501 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00306778000msufc0226.fits
SUN_POSTN:       359.34d {+23h 57m 21s}   -0.29d {-00d 17' 12"}
SUN_DIST:         96.09 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      154.45d {+10h 17m 47s}  +10.00d {+09d 59' 42"}
MOON_DIST:        89.86 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:       83.36, 35.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      239.36, 77.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Mar 08 12:33:18 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     306778,   Seg_Num: 0
POINT_RA:        258.953d {+17h 15m 49s} (J2000)
POINT_DEC:       +55.415d {+55d 24' 54"} (J2000)
ROLL:            81.582d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  44983.87 SOD {12:29:43.87} UT,   226.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     227622586
X_OFFSET:        904 [pixels]
Y_OFFSET:        861 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1064
Y_GRB_POS:       1021
BINNING_INDEX:   1
IM_URL:          sw00306778000msuni0226.fits
SUN_POSTN:       359.34d {+23h 57m 21s}   -0.29d {-00d 17' 11"}
SUN_DIST:         96.09 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      154.46d {+10h 17m 49s}   +9.99d {+09d 59' 25"}
MOON_DIST:        89.86 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:       83.36, 35.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      239.36, 77.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Mar 08 12:44:40 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     306778,   Seg_Num: 0
GRB_RA:          258.9812d {+17h 15m 55.48s} (J2000),
                 259.0214d {+17h 16m 05.13s} (current),
                 258.7369d {+17h 14m 56.86s} (1950)
GRB_DEC:         +55.3918d {+55d 23' 30.4"} (J2000),
                 +55.3831d {+55d 22' 59.0"} (current),
                 +55.4456d {+55d 26' 44.1"} (1950)
GRB_ERROR:       0.4 [arcsec radius, statistical only]
GRB_MAG:         18.79 +/- 0.50 [mag]
FILTER:          10, White
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  44985.00 SOD {12:29:45.00} UT,   228.0 [sec] since BAT Trigger Time
SUN_POSTN:       359.35d {+23h 57m 23s}   -0.28d {-00d 17' 00"}
SUN_DIST:         96.08 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      154.55d {+10h 18m 12s}   +9.94d {+09d 56' 41"}
MOON_DIST:        89.87 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:       83.33, 35.44 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      239.47, 77.66 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN Circular #7441
W. Li, R. Chornock, and A. V. Filippenko, University of California at Berkeley, on behalf of the KAIT GRB team, report:
KAIT responded to GRB 080319C (Swift trigger 306778) and was taking images. There is an afterglow candidate at position
```
RA  = 17:15:55.54
DEC = +55:23:30.8
```
(equinox J2000)
The measured magnitude is R = 17.4 at 12:27:55 UT. Further observations are ongoing.
GCN Circular #7442
C. Pagani (PSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), O. Godet (U Leicester), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), V. Mangano (INAF-IASFPA), J. P. Osborne (U Leicester), K. L. Page (U Leicester), A. M. Parsons (GSFC), J. L. Racusin (PSU), B. Sbarufatti (INAF-IASFPA), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester), G. Stratta (ASDC) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 12:25:56 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080319C (trigger=306778). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 258.973, +55.410 which is
```
   RA(J2000)  =  17h 15m 54s
   Dec(J2000) = +55d 24' 35"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows several overlapping FRED-like peaks starting at T+0 and ending around T+20 sec. The peak count rate was ~8000 counts/sec (15-350 keV), at ~T+0 sec after the trigger.
The XRT began observing the field at 12:29:40 UT, 224 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 258.9828, 55.3920 which is equivalent to:
```
   RA(J2000)  = 17h 15m 55.86s
   Dec(J2000) = +55d 23' 31.2"
```
with an uncertainty of 4.5 arcseconds (radius, 90% containment). This location is 3 arcseconds from the optical afterglow candidate position.
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 227 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	17:15:55.51 = 258.9813   
  DEC(J2000) = +55:23:30.8  = +55.3919    
```
with a 1-sigma error radius of about 0.5 arc sec. This position is 67.4 arc sec. from the center of the BAT error circle. This is consistent with the KAIT position (Li et al., 2008, GCNC 7441). The estimated magnitude is white = 18.8 with a 1-sigma error of about 0.5 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.03.
Burst Advocate for this burst is C. Pagani (pagani 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:     Wed 19 Mar 08 12:33:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     306778,   Seg_Num: 0
POINT_RA:        258.953d {+17h 15m 49s} (J2000)
POINT_DEC:       +55.415d {+55d 24' 54"} (J2000)
ROLL:            81.582d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  44983.87 SOD {12:29:43.87} UT,   226.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     227622586
X_OFFSET:        904 [pixels]
Y_OFFSET:        861 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1064
Y_GRB_POS:       1021
BINNING_INDEX:   1
IM_URL:          sw00306778000msuni0226.fits
SUN_POSTN:       359.34d {+23h 57m 21s}   -0.29d {-00d 17' 10"}
SUN_DIST:         96.09 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      154.46d {+10h 17m 50s}   +9.99d {+09d 59' 19"}
MOON_DIST:        89.86 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:       83.36, 35.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      239.36, 77.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode 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:     Wed 19 Mar 08 12:58:07 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     306778,   Seg_Num: 0
POINT_RA:        258.947d {+17h 15m 47s} (J2000)
POINT_DEC:       +55.413d {+55d 24' 49"} (J2000)
POINT_ROLL:      81.578d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  45628.47 SOD {12:40:28.47} UT,   871.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.073
N_STARS:         38
X_OFFSET:        585 [pixels]
Y_OFFSET:        542 [pixels]
X_MAX:           1544 [pixels]
Y_MAX:           1501 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00306778000msufc0871.fits
SUN_POSTN:       359.35d {+23h 57m 25s}   -0.28d {-00d 16' 46"}
SUN_DIST:         96.10 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      154.66d {+10h 18m 38s}   +9.89d {+09d 53' 27"}
MOON_DIST:        89.83 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:       83.35, 35.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      239.35, 77.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Mar 08 12:58:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     306778,   Seg_Num: 0
POINT_RA:        258.947d {+17h 15m 47s} (J2000)
POINT_DEC:       +55.413d {+55d 24' 49"} (J2000)
POINT_ROLL:      81.578d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  45628.47 SOD {12:40:28.47} UT,   871.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.073
N_STARS:         38
X_OFFSET:        585 [pixels]
Y_OFFSET:        542 [pixels]
X_MAX:           1544 [pixels]
Y_MAX:           1501 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00306778000msufc0871.fits
SUN_POSTN:       359.35d {+23h 57m 25s}   -0.28d {-00d 16' 46"}
SUN_DIST:         96.10 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      154.66d {+10h 18m 39s}   +9.89d {+09d 53' 19"}
MOON_DIST:        89.83 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:       83.35, 35.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      239.35, 77.67 [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:     Wed 19 Mar 08 12:59:28 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     306778,   Seg_Num: 0
POINT_RA:        258.947d {+17h 15m 47s} (J2000)
POINT_DEC:       +55.413d {+55d 24' 49"} (J2000)
ROLL:            81.578d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  45628.47 SOD {12:40:28.47} UT,   871.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     227623231
X_OFFSET:        904 [pixels]
Y_OFFSET:        861 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1064
Y_GRB_POS:       1021
BINNING_INDEX:   1
IM_URL:          sw00306778000msuni0871.fits
SUN_POSTN:       359.36d {+23h 57m 25s}   -0.28d {-00d 16' 45"}
SUN_DIST:         96.10 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      154.67d {+10h 18m 41s}   +9.89d {+09d 53' 08"}
MOON_DIST:        89.83 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:       83.35, 35.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      239.35, 77.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Mar 08 12:59:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     306778,   Seg_Num: 0
POINT_RA:        258.947d {+17h 15m 47s} (J2000)
POINT_DEC:       +55.413d {+55d 24' 49"} (J2000)
ROLL:            81.578d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  45628.47 SOD {12:40:28.47} UT,   871.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     227623231
X_OFFSET:        904 [pixels]
Y_OFFSET:        861 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1064
Y_GRB_POS:       1021
BINNING_INDEX:   1
IM_URL:          sw00306778000msuni0871.fits
SUN_POSTN:       359.36d {+23h 57m 25s}   -0.28d {-00d 16' 45"}
SUN_DIST:         96.10 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      154.67d {+10h 18m 41s}   +9.88d {+09d 53' 04"}
MOON_DIST:        89.83 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:       83.35, 35.46 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      239.35, 77.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode 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:     Wed 19 Mar 08 12:45:26 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     306778,   Seg_Num: 0
GRB_RA:          258.9827d {+17h 15m 55.8s} (J2000),
                 259.0229d {+17h 16m 05.4s} (current),
                 258.7384d {+17h 14m 57.2s} (1950)
GRB_DEC:         +55.3920d {+55d 23' 31.2"} (J2000),
                 +55.3833d {+55d 22' 59.7"} (current),
                 +55.4458d {+55d 26' 44.8"} (1950)
GRB_ERROR:       4.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  44980.65 SOD {12:29:40.65} UT,   223.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       359.35d {+23h 57m 23s}   -0.28d {-00d 16' 59"}
SUN_DIST:         96.08 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      154.56d {+10h 18m 13s}   +9.94d {+09d 56' 30"}
MOON_DIST:        89.87 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:       83.33, 35.44 [deg] galactic lon,lat of the burst
ECL_COORDS:      239.48, 77.66 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values are not valid.

GCN Circular #7443
G. G. Williams (MMTO) and P. A. Milne (Steward Observatory), on behalf of the Super-LOTIS Collaboration, report:
The robotic 0.6-m Super-LOTIS telescope began observing the error box of GRB 080319C (Swift Trigger 306778, Pagani et al. GCN 7442) at 12:26:38.5 UT, 42.5 seconds after the trigger. Our initial observations include 5 x 10s exposures, 5 x 20s exposures, and 30 x 60s exposures, all in the R-band.
We detect the afterglow reported by Li et al. (GCN 7441) in our earliest 10 second exposure. Using the USNO-B1.0 star (453-025776) at RA=17:15:51.7, Dec=55:23:38.4 with R2MAG=14.61, we estimate the following R-band magnitude for the OT:
```
t_start (UT)	exp t (s)	t_start-t_0 (s)	R Mag
----------------------------------------------------------------
12:26:38.5	10 		42.5 		R = 16.83 +/- 0.13
```
Additional observations and analysis are ongoing.
GCN Circular #7450
V. Beckmann (ISDC), S. Mereghetti (INAF/IASF-Milano), A. von Kienlin (MPE), M. Beck, V. Savchenko (ISDC), J. Borkowski (CAMK/Torun), D. Gotz (CEA/Saclay) report on behalf of the INTEGRAL SPI-ACS GRB team:
The three GRB reported on 2008-03-19 by the Swift team (GCN 7426, 7427, 7442) have been independently detected by the SPI Anti-Coincidence System (ACS) on-board INTEGRAL.
```
Burst         T0     duration    max counts in 50 msec
------------------------------------------------------
GRB080319A  05:45:41    10s        370
GRB080319B  06:12:47    57s       5500
GRB080319C  12:25:55    25s       1200
```
The SPI-ACS light curves are available (both as images and data files) at http://isdc.unige.ch/Soft/ibas/ibas_acs_web.cgi
The light curves, binned at 50 ms, are derived from 91 independent detectors with different lower energy thresholds (mainly between 50 keV and 150 keV) and an upper threshold at about 100 MeV. The ACS response varies as a function of the GRB incident angle. For these reasons we caution that the count rates cannot be easily translated into physical flux units.
GCN Circular #7457
M. Marisaldi (INAF/IASF Bologna), F. Fornari (INAF/IASF Milano), C. Labanti, F. Fuschino, M. Galli, A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco (INAF/IASF Bologna), E. Costa, E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta (INAF/IASF Roma), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, M. Fiorini, P. Caraveo (INAF/IASF Milano), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Vallazza (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:
"The Swift localized GRB 080319C (Pagani et al., GCN 7442) triggered the Mini-Calorimeter (MCAL) instrument onboard the AGILE satellite at 12:25:56 UT (=T0). The MCAL instrument covers the energy range 350 keV - 10 MeV, without imaging capabilities.
The MCAL light curve shows two main overlapping broad peaks, the first peaking at T0 and the second peaking at T0+9s in the 350-700 keV energy band. Above 700 keV only the first peak is still detected, with 5 sigma detection also in the 1.4-2.8 MeV energy band. Using the preliminary in-flight calibration, we can estimate the 1-s peak flux in the 350-700 keV energy band at T0 to be 2.0(-0.8,+0.9) photons/cm2/s.
The Swift localization is out of the field of view of the AGILE Gamma-Ray Imaging Detector (GRID), sensitive in the 50 MeV - 50 GeV energy range. Analysis of the GRID count rate does not show any detection. The event was well outside of the SuperAGILE field of view as well, but the event passed through the collimator shield and was weakly detected in the count rate."
We incidentally note that the brighter GRB 080319B (Racusin et al. GCN 7427) was not observed by the AGILE instruments due to Earth occultation.
This message may be cited.
GCN Circular #7460
C. Pagani, J. L. Racusin, J.A. Kennea, D. N. Burrows (PSU) and P. A. Evans (U Leicester) report on behalf of the Swift-XRT team:
The Swift-XRT started observing GRB 080319C (trigger=306778, Pagani et al. GCN 7442) at 12:29:40 UT, 224 seconds after the BAT trigger. The Swift slew to the burst was delayed because of an Earth constraint. The current dataset consist of 2.2ks of Photon Counting mode data from the first orbit of observation.
Using 595 s of overlapping XRT Photon Counting mode and UVOT data, 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 = 258.97980, 55.39197 which is equivalent to:
```
RA (J2000):  17 15 55.15
Dec (J2000): +55 23 31.1
```
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
The 0.3-10 keV X-ray light curve starts at a count rate of ~7 counts/s and peaks at ~18 counts/s at T+360 seconds, after which it shows a decline with a decay slope of 0.9 +/- 0.1 with hints of superimposed flaring activity.
The spectrum of the PC data can be well fit by an absorbed powerlaw with photon index 1.73 +/- 0.06 and column density of (1.5 +/- 0.1)e21 cm^-2, in excess of the Galactic column density of 2.21e20 cm^-2 in this direction. The average observed 0.3-10 keV flux is 1.0e-10 erg cm^-2 s^-1, which corresponds to an unabsorbed flux of 1.3e-10 erg cm^-2 s^-1. The counts to observed flux conversion factor at the time of this spectrum is 4.3e-11 erg cm^-2 count^-1.
If the underlying powerlaw decay continues as is, we predict an XRT count rate of 0.11 counts/s at T+24hr, which corresponds to an observed 0.3-10keV flux of 4.7e-12 erg cm^-2 s^-1.
This circular is an official product of the Swift-XRT team.
GCN Circular #7468
Richard J. Cool (Arizona), Daniel J. Eisenstein (Arizona), David W. Hogg (NYU), Michael R. Blanton (NYU), David J. Schlegel (LBNL), J. Brinkmann (APO), Donald Q. Lamb (Chicago), Donald P. Schneider (PSU), and Daniel E. Vanden Berk (PSU) report:
The Sloan Digital Sky Survey (SDSS) imaged the field of burst GRB080319C prior to the burst. As these data should be useful as a pre-burst comparison and for calibrating photometry, we are supplying the images and photometry measurements for this GRB field to the community.
Data from the SDSS, including 5 FITS images, 3 JPGS, and 3 files of photometry and astrometry, are being placed at http://mizar.as.arizona.edu/~grb/public/GRB080319
We supply FITS images in each of the 5 SDSS bands of a 8'x8' region centered on the GRB position (ra=258.983 (17:15:55.9), dec=55.3920 (55:23:31.2); GCN 7442), as well as 3 gri color-composite JPGs (with different stretches). The units in the FITS images are nanomaggies per pixel. A pixel is 0.396 arcsec on a side. A nanomaggie is a flux-density unit equal to 10^-9 of a magnitude 0 source or, to the extent that SDSS is an AB system, 3.631e-6 Jy. The FITS images have WCS astrometric information.
In the file GRB080319C_sdss.calstar.dat, we report photometry and astrometry of 467 bright stars (r<20.5) within 15' of the burst location. The magnitudes presented in this file are asinh magnitudes as are standard in the SDSS (Lupton 1999, AJ, 118, 1406). Beware that some of these stars are not well-detected in the u-band; use the errors and object flags to monitor data quality.
In the files GRB080319C_sdss.objects_flux.dat and GRB080319C_sdss.objects_magnitudes.dat, we report photometry of 508 objects detected within 6' of the GRB position. We have removed saturated objects and objects with model magnitudes fainter than 23.0 in the r-band. The fluxes listed in GRB080319C_sdss.objects_flux.dat are in nanomaggies while the magnitudes listed in GRB080319C_sdss.objects_magnitudes.dat are asinh magnitudes.
All quantities reported are standard SDSS photometry, meaning that they are very close to AB zeropoints and magnitudes are quoted in asinh magnitudes. Photometric zeropoints are known to about 2% rms. None of the photometry is corrected for dust extinction. The Schlegel, Finkbeiner, and Davis (1998) predictions for this region are A_U=0.134 mag, A_g=0.098 mag, A_r = 0.071 mag, A_i=0.054 mag, and A_z=0.038 mag.
The file GRB080319C_sdss.spectro.dat contains a list of the 4 objects with SDSS spectroscopy within 6 arcminutes of the GRB position. In addition to the redshift and 1-sigma error for each object, this file also lists the object spectroscopic classification.
SDSS astrometry is generally better than 0.1 arcsecond per coordinate. Users requiring high precision astrometry should take note that the SDSS astrometric system can differ from other systems such as those used in other notices; we have not checked the offsets in this region.
More detailed information pertaining to our SDSS GRB releases can be found in our initial data release paper (Cool et al. 2006, PASP 118, 733). See the SDSS DR4 documentation for more details: http://www.sdss.org/dr5.
These data have been reduced using a slightly different pipeline than that used for SDSS public data releases. We cannot guarantee that the values here will exactly match those in the data release in which these data are included. In particular, we expect the photometric calibrations to differ by of order 0.01 mag.
This note may be cited, but please also cite the SDSS data release paper, Adelman-McCarthy et al. (2007, ApJS, 172, 634), when using the data or referring to the technical documentation.
GCN Circular #7475
W. Li and A. V. Filippenko, University of California, Berkeley, report on behalf of the KAIT GRB team:
We have analyzed the KAIT observations of the optical afterglow (OA) of GRB 080319C (GCN 7442, GCN 7460) as reported in GCN 7441. Our first 5 s unfiltered observation started at 12:27:11 UT, 75 s after the BAT trigger. Four subsequent 5 s exposures from t = 81 s to 100 s indicate a smoothly decaying behavior (but perhaps not power law). After reaching a minimum at t = 180 s (or perhaps a bit earlier), the OA brightened steeply to a second prominent peak centered at t ~ 320 s, after which the OA decayed as an approximate power law, with evidence for a gradually steepening decay index. Selected photometry, all unfiltered but calibrated to the R band via USNO B1:
```
  t_start (s) exp (s)    mag  mag_err

          75    5.0      17.353 0.057 
         100    5.0      17.71  0.062 
         180   20.0      17.95  0.051
         271   20.0      17.322 0.022
         362   20.0      17.32  0.023 
         453   20.0      17.487 0.027
         845   20.0      18.06  0.048 
        1429   20.0      18.866 0.096 
```
GCN Circular #7477
J. Wren, W.T. Vestrand, P.R. Wozniak, H. Davis of Los Alamos National Laboratory report:
Our RAPTOR telescopes responded to Swift trigger 306778 (Pagani et al., GCN 7442) at 12:26:30.66 UTC, 33.70 seconds after the trigger. We detect the optical counterpart initially reported by Li (GCN 7441). Our measurements are consistent with those reported by KAIT (GCN 7441 and 7475) and Super-LOTIS (7443). Our images became dominated by the morning twilight at about 12:35 UTC. The unfiltered measurements reported in the following table are calibrated to the USNO-B1 R band.
```
t-mid(s)    exp(s)     mag     mag-err
-----------------------------------------
47.60       5.0       16.97     0.32
85.27       80.3      17.65     0.18
177.36      61.5      18.22     0.36
228.87      61.1      17.32     0.16
293.28      61.7      17.41     0.20
358.12      62.1      17.13     0.16
```
GCN Circular #7483
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), K. McLean (GSFC/UMD), C. Pagani (PSU), D. Palmer (LANL), A. Parsons (GSFC), 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-120 to T+88 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080319C (trigger #306778) (Pagani, et al., GCN Circ. 7442). The BAT ground-calculated position is RA, Dec = 259.006, 55.393 deg which is
```
   RA(J2000)  =  17h 16m 01.4s 
   Dec(J2000) = +55d 23' 33.0" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 30%.
For the limited event-by-event data we have received on this burst, the mask-weighted light curve shows 2 (possibly 3) overlapping FRED-like peaks starting at T-0.5 sec, peaking at T+0.2 sec, and ending at ~T+50 sec. The event-by-event data for this m-w lightcurve ends at T+88 sec. The on-board raw countrate lightcurve shows no activity after the T+88 sec limit of the event data, but the sensitivity is significantly less for this data product. T90 (15-350 keV) is 34 +- 9 sec (estimated error including systematics).
The time-averaged spectrum from T-0.3 to T+51.2 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.37 +- 0.07. The fluence in the 15-150 keV band is 3.6 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.13 sec in the 15-150 keV band is 5.2 +- 0.3 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/306778/BA/
If we receive any more data on this burst and it shows any on-going activity beyond the current data limit of T+88 sec, then we will issue a revised circular.
GCN Circular #7487
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline on behalf of the Konus-Wind team report:
The long GRB 080319C (Swift-BAT trigger #306778: Pagani et al., GCN 7442, Stamatikos et al., GCN 7483) triggered Konus-Wind at T0=44757.938 s UT (12:25:57.938).
The burst light curve shows a multipeaked structure with a total duration of ~15 s.
As observed by Konus-Wind the burst had a fluence of 1.50(-0.21, +0.34)x10^-5 erg/cm2, and a 256-ms peak flux measured from T0+0.256 s of 3.35(-0.70, +0.79)x10^-6 erg/cm2/s (both in the 20 keV - 4 MeV energy range).
The time-integrated spectrum of the burst (from T0 to T0+16.640 s) is well fitted (in the 20 keV-4 MeV range) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.20 +/- 0.10, and Ep = 594(-131, +224) keV (chi2 = 79.3/73 dof). Fitting by GRBM (Band) model yields: the low-energy photon index is alpha = -1.01 +/- 0.13, the high energy photon index beta = -1.87(-0.63, +0.15), the peak energy Ep = 307(-92, +141) keV (chi2 = 76.1/72 dof).
All the quoted errors are at the 90% confidence level.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB080319_T44757/
GCN Circular #7497
S. T. Holland (CRESST/USRA/GSFC) & C. Pagani (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 080319C starting 210 s after the BAT trigger (Pagani et al., GCN Circ. 7442). We detect the optical afterglow in the v, b, u, and white filters at location of the KAIT optical afterglow (Li, et al., 2008, GCNC 7441). The UVOT source position is
```
RA(J2000.0) =  17:15:55.49
Dec(J2000.0) = +55:23:30.6
```
with an estimated uncertainty of +/-0.53 arcsec (radius, 90% confidence).
Magnitudes and upper limits are reported below.
```
Filter    T_start (s) T_stop  Exposure      Mag  Err  Comment
v          334        353       19     18.09 0.30
b          433        443       10     19.02 0.53
u          408        581       39     19.08 0.36
uvw1        383       2410      214    >20.0        3-sigma UL
uvm2        358       2385      175    >19.6        3-sigma UL
uvw2        463       2336      175    >19.9        3-sigma UL
white        227        327       98     18.81 0.08
```
The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 0 .03 mag (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT flight system described in Poole et al. (2008, MNRAS, 383,627). The non-detections in the three ultraviolet filters may indicate that the redshift is z >~ 3.
GCN Circular #7508
K.Onda, M. Tashiro, Y. Terada, Y. Urata, A. Endo, M. Suzuki, N. Kodaka, K. Morigami (Saitama U.), M. Ohno, T. Uehara, T. Takahashi, Y. Fukazawa, C. Kira, Y. Hanabata (Hiroshima U.), T. Tamagawa (RIKEN), K. Yamaoka, Y. E. Nakagawa, S. Sugita (Aoyama Gakuin U.), T. Enoto, R. Miyawaki, K. Nakazawa, K. Makishima (Univ. of Tokyo), E. Sonoda, M. Yamauchi, H. Tanaka, R. Hara (Univ. of Miyazaki), M. Kokubun, M. Suzuki, T. Takahashi (ISAS/JAXA), S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report:
The long GRB 080319C (Swift/BAT trigger #306778 ; Pagani et al., GCN 7442) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 12:25:56 UT (=T0). The observed light curve shows a multi-peaked structure starting at T0s, ending at T0+14s with a duration (T90) of about 13 seconds. The fluence in 100 - 1000 keV was 6.4(+0.4, -0.9)*10^-6 erg/cm^2. The 1-s peak flux measured from T0+2s was 4.2(+0.2, -0.3) photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0s to T0+13s is well fitted by a power-law with exponential cutoff model:
```
   dN/dE ~  E^{-alpha} * exp(-(2-alpha)*E/Epeak) with
   alpha       0.67(+0.30, -0.36), and
   Epeak       761(+255, -136) keV (chi^2/d.o.f. = 32.2/23).
```
All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included. The light curves for this burst are available at:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
GCN Circular #7517
K. Wiersema, N. Tanvir (University of Leicester), P. Vreeswijk, J. Fynbo (DARK Cosmology Centre), R. Starling, E. Rol (Leicester) and P. Jakobsson (Hertfordshire) report on behalf of a large collaboration:
We observed the afterglow of GRB 080319C (GCN 7442) with Gemini North, using the GMOS-N instrument. We took spectra using the B600 grism (exposure time 4 x 900s) in bad weather conditions: exposures were taken through holes in the cloud deck. Observations started at 14:51 UT on March 19th.
The spectrum shows several absorption lines of C IV, Al II, Si II, Al III, Mg I and the CrII / ZnII blend. From these we find the redshift z = 1.95.
We are very grateful to the Gemini staff, in particular Paul Hirst, for executing these observations.
GCN Report 124.1
GCN_Report 124.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_124_1.pdf by C. Pagani at PSU titled: "Final Swift Observations of GRB 080319C"

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Jochen Greiner, last update: 11-Apr-2008 [Disclaimer]