Gamma-ray Burst 110318B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 Mar 11 15:27:35 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     449549,   Seg_Num: 0
GRB_RA:          211.695d {+14h 06m 47s} (J2000),
                 211.880d {+14h 07m 31s} (current),
                 210.873d {+14h 03m 30s} (1950)
GRB_DEC:         -51.559d {-51d 33' 31"} (J2000),
                 -51.612d {-51d 36' 42"} (current),
                 -51.321d {-51d 19' 14"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4696 [cnts]    Image_Peak=183 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       30755 [cnts]
BKG_TIME:        55617.23 SOD {15:26:57.23} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15638 TJD;    77 DOY;   11/03/18
GRB_TIME:        55629.71 SOD {15:27:09.71} UT
GRB_PHI:         -61.16 [deg]
GRB_THETA:        17.77 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.40 [sigma]
IMAGE_SIGNIF:    7.14 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -3  +0  +1 +50  +0 
SUN_POSTN:       357.87d {+23h 51m 30s}   -0.92d {-00d 55' 17"}
SUN_DIST:        120.14 [deg]   Sun_angle= 9.7 [hr] (West of Sun)
MOON_POSTN:      161.56d {+10h 46m 14s}   +2.65d {+02d 38' 57"}
MOON_DIST:        68.91 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      314.68,  9.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      229.13,-36.06 [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 = 114.23,12.39 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 Mar 11 15:28:29 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     449549,   Seg_Num: 0
POINT_RA:        211.700d {+14h 06m 48s} (J2000)
POINT_DEC:       -51.549d {-51d 32' 57"} (J2000)
IMG_START_DATE:  15638 TJD;    77 DOY;   11/03/18
IMG_START_TIME:  55702.50 SOD {15:28:22.50} UT,   72.8 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 Mar 11 15:31:03 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     449549,   Seg_Num: 0
GRB_RA:          211.695d {+14h 06m 47s} (J2000),
                 211.880d {+14h 07m 31s} (current),
                 210.873d {+14h 03m 30s} (1950)
GRB_DEC:         -51.559d {-51d 33' 31"} (J2000),
                 -51.612d {-51d 36' 42"} (current),
                 -51.321d {-51d 19' 14"} (1950)
GRB_DATE:        15638 TJD;    77 DOY;   11/03/18
GRB_TIME:        55629.71 SOD {15:27:09.71} UT
TRIGGER_INDEX:   146
GRB_PHI:         -61.16 [deg]
GRB_THETA:        17.77 [deg]
DELTA_TIME:      32.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.40 [sigma]
IMAGE_SIGNIF:    7.14 [sigma]
LC_URL:          sw00449549000msb.lc
SUN_POSTN:       357.88d {+23h 51m 30s}   -0.92d {-00d 55' 13"}
SUN_DIST:        120.14 [deg]   Sun_angle= 9.7 [hr] (West of Sun)
MOON_POSTN:      161.59d {+10h 46m 22s}   +2.63d {+02d 38' 05"}
MOON_DIST:        68.88 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      314.68,  9.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      229.13,-36.06 [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 = 114.23,12.39 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 Mar 11 15:31:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     449549,   Seg_Num: 0
POINT_RA:        211.700d {+14h 06m 48s} (J2000)
POINT_DEC:       -51.549d {-51d 32' 55"} (J2000)
POINT_ROLL:      139.874d
IMG_START_DATE:  15638 TJD;    77 DOY;   11/03/18
IMG_START_TIME:  55705.73 SOD {15:28:25.73} UT,   76.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.706
N_STARS:         190
X_OFFSET:        562 [pixels]
Y_OFFSET:        587 [pixels]
X_MAX:           1521 [pixels]
Y_MAX:           1546 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00449549000msufc0076.fits
SUN_POSTN:       357.88d {+23h 51m 30s}   -0.92d {-00d 55' 13"}
SUN_DIST:        120.15 [deg]   Sun_angle= 9.7 [hr] (West of Sun)
MOON_POSTN:      161.59d {+10h 46m 23s}   +2.63d {+02d 37' 59"}
MOON_DIST:        68.87 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      314.68,  9.60 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      229.12,-36.05 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 Mar 11 15:32:32 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     449549,   Seg_Num: 0
GRB_RA:          211.6780d {+14h 06m 42.71s} (J2000),
                 211.8631d {+14h 07m 27.14s} (current),
                 210.8561d {+14h 03m 25.45s} (1950)
GRB_DEC:         -51.5795d {-51d 34' 46.2"} (J2000),
                 -51.6326d {-51d 37' 57.1"} (current),
                 -51.3415d {-51d 20' 29.5"} (1950)
GRB_ERROR:       3.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15638 TJD;    77 DOY;   11/03/18
IMG_START_TIME:  55717.00 SOD {15:28:37.00} UT,   87.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       357.88d {+23h 51m 30s}   -0.92d {-00d 55' 12"}
SUN_DIST:        120.13 [deg]   Sun_angle= 9.7 [hr] (West of Sun)
MOON_POSTN:      161.60d {+10h 46m 25s}   +2.63d {+02d 37' 42"}
MOON_DIST:        68.87 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      314.66,  9.57 [deg] galactic lon,lat of the burst
ECL_COORDS:      229.13,-36.09 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 Mar 11 15:32:55 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     449549,   Seg_Num: 0
POINT_RA:        211.700d {+14h 06m 48s} (J2000)
POINT_DEC:       -51.549d {-51d 32' 55"} (J2000)
ROLL:            139.874d
IMG_START_DATE:  15638 TJD;    77 DOY;   11/03/18
IMG_START_TIME:  55705.73 SOD {15:28:25.73} UT,   76.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     322154912
X_OFFSET:        881 [pixels]
Y_OFFSET:        906 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1041
Y_GRB_POS:       1066
BINNING_INDEX:   1
IM_URL:          sw00449549000msuni0083.fits
SUN_POSTN:       357.88d {+23h 51m 30s}   -0.92d {-00d 55' 11"}
SUN_DIST:        120.15 [deg]   Sun_angle= 9.7 [hr] (West of Sun)
MOON_POSTN:      161.61d {+10h 46m 26s}   +2.63d {+02d 37' 37"}
MOON_DIST:        68.86 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      314.68,  9.60 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      229.12,-36.05 [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 Circular #11799
R. Margutti (INAF-OAB), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), S. Campana (INAF-OAB), P. D'Avanzo (INAF-OAB), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), C. Gronwall (PSU), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), O. M. Littlejohns (U Leicester), V. Mangano (INAF-IASFPA), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), P. T. O'Brien (U Leicester), J. P. Osborne (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), P. Romano (INAF-IASFPA), B. Sbarufatti (INAF-OAB/IASFPA), M. H. Siegel (PSU), E. Sonbas (GSFC/USRA/Adiyaman Univ.) and C. A. Swenson (PSU) report on behalf of the Swift Team:
At 15:27:09 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110318B (trigger=449549). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 211.695, -51.559, which is
```
   RA(J2000)  =  14h 06m 47s
   Dec(J2000) = -51d 33' 31"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a couple peaks with a total duration of about 10 sec. The peak count rate was ~1100 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 15:28:22.5 UT, 72.8 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 211.67805, -51.57933 which is equivalent to:
```
   RA(J2000)  = 14h 06m 42.73s
   Dec(J2000) = -51d 34' 45.6"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 82 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.42 x 10^21 cm^-2 (Kalberla et al. 2005).
The UVOT processed images are delayed and will be analyzed as soon as possible.
Burst Advocate for this burst is R. Margutti (raffaella.margutti AT brera.inaf.it). 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 Circular #11800
R. Margutti (INAF-OAB), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), S. Campana (INAF-OAB), P. D'Avanzo (INAF-OAB), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), C. Gronwall (PSU), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), O. M. Littlejohns (U Leicester), V. Mangano (INAF-IASFPA), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), P. T. O'Brien (U Leicester), J. P. Osborne (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), P. Romano (INAF-IASFPA), B. Sbarufatti (INAF-OAB/IASFPA), M. H. Siegel (PSU), E. Sonbas (GSFC/USRA/Adiyaman Univ.) and C. A. Swenson (PSU) report on behalf of the Swift Team:
At 15:27:09 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110318B (trigger=449549). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 211.695, -51.559, which is
```
   RA(J2000)  =  14h 06m 47s
   Dec(J2000) = -51d 33' 31"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a couple peaks with a total duration of about 10 sec. The peak count rate was ~1100 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 15:28:22.5 UT, 72.8 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 211.67805, -51.57933 which is equivalent to:
```
   RA(J2000)  = 14h 06m 42.73s
   Dec(J2000) = -51d 34' 45.6"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 82 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.42 x 10^21 cm^-2 (Kalberla et al. 2005).
The UVOT processed images are delayed and will be analyzed as soon as possible.
Burst Advocate for this burst is R. Margutti (raffaella.margutti AT brera.inaf.it). 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:     Fri 18 Mar 11 15:40:36 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     449549,   Seg_Num: 0
POINT_RA:        211.698d {+14h 06m 48s} (J2000)
POINT_DEC:       -51.546d {-51d 32' 46"} (J2000)
POINT_ROLL:      139.876d
IMG_START_DATE:  15638 TJD;    77 DOY;   11/03/18
IMG_START_TIME:  55919.11 SOD {15:31:59.11} UT,   289.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.827
N_STARS:         190
X_OFFSET:        322 [pixels]
Y_OFFSET:        347 [pixels]
X_MAX:           1761 [pixels]
Y_MAX:           1786 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00449549000msufc0289.fits
SUN_POSTN:       357.88d {+23h 51m 32s}   -0.92d {-00d 55' 04"}
SUN_DIST:        120.15 [deg]   Sun_angle= 9.7 [hr] (West of Sun)
MOON_POSTN:      161.68d {+10h 46m 44s}   +2.59d {+02d 35' 40"}
MOON_DIST:        68.79 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      314.68,  9.60 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      229.12,-36.05 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 Mar 11 15:41:24 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     449549,   Seg_Num: 0
GRB_RA:          211.6785d {+14h 06m 42.84s} (J2000),
                 211.8636d {+14h 07m 27.26s} (current),
                 210.8566d {+14h 03m 25.58s} (1950)
GRB_DEC:         -51.5790d {-51d 34' 44.4"} (J2000),
                 -51.6321d {-51d 37' 55.3"} (current),
                 -51.3410d {-51d 20' 27.7"} (1950)
GRB_ERROR:       2.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15638 TJD;    77 DOY;   11/03/18
IMG_START_TIME:  55717.00 SOD {15:28:37.00} UT,   87.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       357.88d {+23h 51m 32s}   -0.92d {-00d 55' 03"}
SUN_DIST:        120.14 [deg]   Sun_angle= 9.7 [hr] (West of Sun)
MOON_POSTN:      161.69d {+10h 46m 46s}   +2.59d {+02d 35' 28"}
MOON_DIST:        68.80 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      314.66,  9.57 [deg] galactic lon,lat of the burst
ECL_COORDS:      229.13,-36.09 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 Mar 11 15:42:01 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     449549,   Seg_Num: 0
POINT_RA:        211.698d {+14h 06m 48s} (J2000)
POINT_DEC:       -51.546d {-51d 32' 46"} (J2000)
ROLL:            139.876d
IMG_START_DATE:  15638 TJD;    77 DOY;   11/03/18
IMG_START_TIME:  55919.11 SOD {15:31:59.11} UT,   289.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     322155125
X_OFFSET:        881 [pixels]
Y_OFFSET:        906 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1041
Y_GRB_POS:       1066
BINNING_INDEX:   1
IM_URL:          sw00449549000msuni0296.fits
SUN_POSTN:       357.88d {+23h 51m 32s}   -0.92d {-00d 55' 02"}
SUN_DIST:        120.15 [deg]   Sun_angle= 9.7 [hr] (West of Sun)
MOON_POSTN:      161.70d {+10h 46m 47s}   +2.59d {+02d 35' 19"}
MOON_DIST:        68.78 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      314.68,  9.60 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      229.12,-36.05 [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:     Fri 18 Mar 11 15:48:34 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     449549,   Seg_Num: 0
POINT_RA:        211.698d {+14h 06m 48s} (J2000)
POINT_DEC:       -51.546d {-51d 32' 46"} (J2000)
POINT_ROLL:      139.876d
IMG_START_DATE:  15638 TJD;    77 DOY;   11/03/18
IMG_START_TIME:  56497.54 SOD {15:41:37.54} UT,   867.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.869
N_STARS:         190
X_OFFSET:        322 [pixels]
Y_OFFSET:        347 [pixels]
X_MAX:           1761 [pixels]
Y_MAX:           1786 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00449549000msufc0867.fits
SUN_POSTN:       357.89d {+23h 51m 33s}   -0.92d {-00d 54' 56"}
SUN_DIST:        120.16 [deg]   Sun_angle= 9.7 [hr] (West of Sun)
MOON_POSTN:      161.76d {+10h 47m 02s}   +2.56d {+02d 33' 40"}
MOON_DIST:        68.73 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      314.68,  9.60 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      229.12,-36.05 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 Mar 11 15:50:17 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     449549,   Seg_Num: 0
POINT_RA:        211.698d {+14h 06m 48s} (J2000)
POINT_DEC:       -51.546d {-51d 32' 46"} (J2000)
ROLL:            139.876d
IMG_START_DATE:  15638 TJD;    77 DOY;   11/03/18
IMG_START_TIME:  56497.54 SOD {15:41:37.54} UT,   867.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     322155704
X_OFFSET:        881 [pixels]
Y_OFFSET:        906 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1041
Y_GRB_POS:       1066
BINNING_INDEX:   1
IM_URL:          sw00449549000msuni0874.fits
SUN_POSTN:       357.89d {+23h 51m 33s}   -0.92d {-00d 54' 54"}
SUN_DIST:        120.16 [deg]   Sun_angle= 9.7 [hr] (West of Sun)
MOON_POSTN:      161.78d {+10h 47m 06s}   +2.55d {+02d 33' 14"}
MOON_DIST:        68.71 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      314.68,  9.60 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      229.12,-36.05 [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 Circular #11801
S. T. Holland (CRESST/USRA/GSFC) & R. Margutti (INAF-OAB) report on behalf of the Swift/UVOT team:
UVOT took a finding chart exposure of the field of GRB 110318B (Margutti et al. 2011, GCNC 11800) of 150 seconds with the White filter starting 77 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.46.
GCN Circular #11803
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 1818 s of XRT Photon Counting mode data and 2 UVOT images for GRB 110318B, 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 = 211.67808, -51.57883 which is equivalent to:
```
RA (J2000): 14h 06m 42.74s
Dec (J2000): -51d 34' 43.8"
```
with an uncertainty of 1.8 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, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #11804
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), R. Margutti (INAF-OAB), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 110318B (trigger #449549) (Margutti, et al., GCN Circ. 11799). The BAT ground-calculated position is RA, Dec = 211.691, -51.577 deg, which is
```
   RA(J2000)  =  14h 06m 45.9s 
   Dec(J2000) = -51d 34' 35.7" 
```
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 85%.
The mask-weighted light curve shows a single peak starting at ~T-2 sec, peaking at ~T+1 sec, and ending at ~T+5 sec. T90 (15-350 keV) is 4.8 +- 0.6 sec (estimated error including systematics).
The time-averaged spectrum from T-1.7 to T+3.7 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.09 +- 0.17. The fluence in the 15-150 keV band is 2.9 +- 0.3 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.76 sec in the 15-150 keV band is 0.7 +- 0.1 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/449549/BA/
GCN Circular #11806
R. Margutti, B. Sbarufatti, A. Melandri (INAF-OAB) report on behalf of the Swift-XRT team:
We have analysed 4.9 ks of XRT data for GRB 110318B (Margutti et al. GCN Circ. 11799), from 83 s to 13.4 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN. Circ 11803).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.10 (+0.10, -0.09).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.3 (+/-0.3). The best-fitting absorption column is 5.2 (+1.5, -1.3) x 10^21 cm^-2, in excess of the Galactic value of 2.4 x 10^21 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.3 x 10^-11 (9.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     5.2 (+1.5, -1.3) x 10^21 cm^-2
Galactic foreground: 2.4 x 10^21 cm^-2
Excess significance: 6.5 sigma
Photon index:	     2.3 (+/-0.3)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00449549.
This circular is an official product of the Swift-XRT team.
GCN Circular #11809
T. Kruehler, J. Greiner, F. Schrey (all MPE Garching), and S. Klose (TLS Tautenburg) report on behalf of the GROND team.
We observed the field of GRB 110318B (Swift trigger 449549; Margutti et al., GCN #11800 simultaneously in g'r'i'z' with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPI/ESO telescope at La Silla Observatory (Chile).
Observation started at 07:40 UT, which is 16.2 h after the trigger, and were obtained under clear skies with an airmass of around 1.1 and seeing of 1"
In stacked images with a total integration time of 25 min, we do not detect a source in the refined XRT error circle (Evans et al., GCN #11803) to the following upper limits (AB system):
```
g' > 23.7
r' > 23.6
i' > 23.6
z' > 23.4
```
Given magnitudes are calibrated against GROND zeropoints and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.46 mag in the direction of the burst (Schlegel et al. 1998).
GROND is currently undergoing hardware maintenance, and hence no NIR data are available for this burst.
GCN Circular #11816
S. T. Holland (CRESST/USRA/GSFC) and R. Margutti (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 110318B starting 58 s after the BAT trigger (Margutti, et al., 2011, GCN Circ. 11799). Settled observations started at 76 s. We do not detect an optical afterglow at the UVOT-enhanced XRT position (Evans, et al., 2011, GCN Circ. 11803) in any of the UVOT filters. Preliminary 3-sigma upper limits for detecting a source in the finding charts and in the co-added images, are
```
Filter      T_start   T_stop    Exp(s)      Mag
-----------------------------------------------
white (fc)       76      226       147    >21.5
                868     1018       147    >21.5


    v           619     7035       529    >20.6
    b           545     7693       370    >21.2
    u           289     7649       756    >21.2
 uvw1           668     7445       529    >20.8
 uvm2          5602     7239       393    >20.5
 uvw2          1024     6829       236    >20.3
white            76     6623       626    >22.2
-----------------------------------------------
```
The quoted magnitudes and upper limits have not been corrected for the expected Galactic extinction along the line of sight corresponding to a reddening of E_{B-V} = 0.46 mag (Schlegel, et al., 1998, ApJS, 500, 525).
GCN Circular #11822
D. Suzuki (STE Lab. Nagoya Univ.), P.J. Tristram (Mt. John University Observatory), S. Kobara, K. Omori, H. Naito and T. Sako (STE Lab. Nagoya Univ.) on behalf of the MOA Collaboration report :
We searched for an optical afterglow of GRB110318B (GCN 11799, R. Margutti et al.) starting from 15:40 UT on 2011 March 18 (13 minutes after the burst) with the MOA-II 1.8m telescope at Mt.John observatory in New Zealand. In a single image of a 60 sec exposure with a wideband Red filter (center wavelength ~ 750nm and FWHM ~ 250nm), we did not find any object within the error circle of the Swift XRT source position (GCN 11803, P.A. Evans et al.). A 3 sigma upper limit is set in the I magnitude at 20.7 mag.
This photometry was done by using the DoPhot and calibrated against the USNO-B1.0 catalog stars, and not corrected for the Galactic extinction.
GCN Report 326.1
GCN_Report 326.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_326_1.pdf by R. Margutti at INAF-OAB titled: "Final Swift Observations of GRB 110318B"

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Jochen Greiner, last update: 25-Mar-2011 [Disclaimer]