Gamma-ray Burst 070330

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 30 Mar 07 22:51:45 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     273180,   Seg_Num: 0
GRB_RA:          269.519d {+17h 58m 05s} (J2000),
                 269.694d {+17h 58m 47s} (current),
                 268.314d {+17h 53m 15s} (1950)
GRB_DEC:         -63.779d {-63d 46' 44"} (J2000),
                 -63.779d {-63d 46' 45"} (current),
                 -63.774d {-63d 46' 25"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       6956 [cnts]    Image_Peak=308 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   137     E_range: 15-50 keV
BKG_INTEN:       46502 [cnts]
BKG_TIME:        82278.14 SOD {22:51:18.14} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14189 TJD;    89 DOY;   07/03/30
GRB_TIME:        82291.19 SOD {22:51:31.19} UT
GRB_PHI:         -68.89 [deg]
GRB_THETA:        18.57 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.20 [sigma]
IMAGE_SIGNIF:    10.25 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +1  +2  +0  +0 +13  +1 
SUN_POSTN:         9.06d {+00h 36m 14s}   +3.90d {+03d 54' 12"}
SUN_DIST:         97.63 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      161.38d {+10h 45m 31s}   +8.51d {+08d 30' 19"}
MOON_DIST:       105.66 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      329.90,-18.56 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      269.72,-40.34 [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 = 132.25,-17.15 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 30 Mar 07 22:52:49 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     273180,   Seg_Num: 0
POINT_RA:        269.493d {+17h 57m 58s} (J2000)
POINT_DEC:       -63.775d {-63d 46' 28"} (J2000)
IMG_START_DATE:  14189 TJD;    89 DOY;   07/03/30
IMG_START_TIME:  82359.01 SOD {22:52:39.01} UT,   67.8 [sec] since BAT Trigger Time
COUNTS:          6    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    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 30 Mar 07 22:54:55 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     273180,   Seg_Num: 0
GRB_RA:          269.519d {+17h 58m 05s} (J2000),
                 269.694d {+17h 58m 47s} (current),
                 268.314d {+17h 53m 15s} (1950)
GRB_DEC:         -63.779d {-63d 46' 44"} (J2000),
                 -63.779d {-63d 46' 45"} (current),
                 -63.774d {-63d 46' 25"} (1950)
GRB_DATE:        14189 TJD;    89 DOY;   07/03/30
GRB_TIME:        82291.19 SOD {22:51:31.19} UT
TRIGGER_INDEX:   137
GRB_PHI:         -68.89 [deg]
GRB_THETA:        18.57 [deg]
DELTA_TIME:      -25.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.20 [sigma]
IMAGE_SIGNIF:    10.25 [sigma]
LC_URL:          sw00273180000msb.lc
SUN_POSTN:         9.06d {+00h 36m 14s}   +3.90d {+03d 54' 15"}
SUN_DIST:         97.63 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      161.40d {+10h 45m 37s}   +8.49d {+08d 29' 35"}
MOON_DIST:       105.64 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      329.90,-18.56 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      269.72,-40.34 [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 = 132.25,-17.15 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 30 Mar 07 23:02:39 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     273180,   Seg_Num: 0
POINT_RA:        269.491d {+17h 57m 58s} (J2000)
POINT_DEC:       -63.775d {-63d 46' 27"} (J2000)
POINT_ROLL:      96.879d
IMG_START_DATE:  14189 TJD;    89 DOY;   07/03/30
IMG_START_TIME:  82356.63 SOD {22:52:36.63} UT,   65.4 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.432
N_STARS:         190
X_OFFSET:        585 [pixels]
Y_OFFSET:        525 [pixels]
X_MAX:           1544 [pixels]
Y_MAX:           1484 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00273180000msufc0065.fits
SUN_POSTN:         9.06d {+00h 36m 15s}   +3.91d {+03d 54' 23"}
SUN_DIST:         97.65 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      161.46d {+10h 45m 51s}   +8.46d {+08d 27' 48"}
MOON_DIST:       105.58 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      329.90,-18.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      269.70,-40.34 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 30 Mar 07 23:03:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     273180,   Seg_Num: 0
POINT_RA:        269.491d {+17h 57m 58s} (J2000)
POINT_DEC:       -63.775d {-63d 46' 27"} (J2000)
POINT_ROLL:      96.879d
IMG_START_DATE:  14189 TJD;    89 DOY;   07/03/30
IMG_START_TIME:  82356.63 SOD {22:52:36.63} UT,   65.4 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.432
N_STARS:         190
X_OFFSET:        585 [pixels]
Y_OFFSET:        525 [pixels]
X_MAX:           1544 [pixels]
Y_MAX:           1484 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00273180000msufc0065.fits
SUN_POSTN:         9.06d {+00h 36m 15s}   +3.91d {+03d 54' 23"}
SUN_DIST:         97.65 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      161.47d {+10h 45m 52s}   +8.46d {+08d 27' 41"}
MOON_DIST:       105.58 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      329.90,-18.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      269.70,-40.34 [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:     Fri 30 Mar 07 23:03:35 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     273180,   Seg_Num: 0
GRB_RA:          269.5407d {+17h 58m 09.7s} (J2000),
                 269.7154d {+17h 58m 51.7s} (current),
                 268.3347d {+17h 53m 20.3s} (1950)
GRB_DEC:         -63.7933d {-63d 47' 35.8"} (J2000),
                 -63.7936d {-63d 47' 36.8"} (current),
                 -63.7881d {-63d 47' 17.2"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.00 [sigma]
IMG_START_DATE:  14189 TJD;    89 DOY;   07/03/30
IMG_START_TIME:  82359.00 SOD {22:52:39.00} UT,   67.8 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:         9.06d {+00h 36m 15s}   +3.91d {+03d 54' 24"}
SUN_DIST:         97.63 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      161.47d {+10h 45m 52s}   +8.46d {+08d 27' 35"}
MOON_DIST:       105.59 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      329.89,-18.58 [deg] galactic lon,lat of the burst
ECL_COORDS:      269.73,-40.35 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 30 Mar 07 23:04:12 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     273180,   Seg_Num: 0
POINT_RA:        269.491d {+17h 57m 58s} (J2000)
POINT_DEC:       -63.775d {-63d 46' 27"} (J2000)
ROLL:            96.879d
IMG_START_DATE:  14189 TJD;    89 DOY;   07/03/30
IMG_START_TIME:  82356.63 SOD {22:52:36.63} UT,   65.4 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     196987958
X_OFFSET:        904 [pixels]
Y_OFFSET:        844 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1064
Y_GRB_POS:       1004
BINNING_INDEX:   1
IM_URL:          sw00273180000msuni0065.fits
SUN_POSTN:         9.06d {+00h 36m 15s}   +3.91d {+03d 54' 24"}
SUN_DIST:         97.65 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      161.47d {+10h 45m 53s}   +8.46d {+08d 27' 27"}
MOON_DIST:       105.57 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      329.90,-18.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      269.70,-40.34 [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 30 Mar 07 23:04:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     273180,   Seg_Num: 0
POINT_RA:        269.491d {+17h 57m 58s} (J2000)
POINT_DEC:       -63.775d {-63d 46' 27"} (J2000)
ROLL:            96.879d
IMG_START_DATE:  14189 TJD;    89 DOY;   07/03/30
IMG_START_TIME:  82356.63 SOD {22:52:36.63} UT,   65.4 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     196987958
X_OFFSET:        904 [pixels]
Y_OFFSET:        844 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1064
Y_GRB_POS:       1004
BINNING_INDEX:   1
IM_URL:          sw00273180000msuni0065.fits
SUN_POSTN:         9.06d {+00h 36m 16s}   +3.91d {+03d 54' 25"}
SUN_DIST:         97.65 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      161.48d {+10h 45m 54s}   +8.46d {+08d 27' 22"}
MOON_DIST:       105.57 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      329.90,-18.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      269.70,-40.34 [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:        All 4 attachments are included.

GCN Circular #6232
D. Grupe (PSU), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), M. M. Chester (PSU), C. Guidorzi (Univ Bicocca&INAF-OAB), S. T. Holland (CRESST/GSFC/USRA), J. A. Kennea (PSU), C. B. Markwardt (GSFC/UMD), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), B. Sbarufatti (INAF-IASFPA), M. Stamatikos (NASA/ORAU) and M. C. Stroh (PSU) report on behalf of the Swift Team:
At 22:51:31 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 070330 (trigger=273180). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 269.519, -63.779 which is
```
   RA(J2000)  =  17h 58m 05s
   Dec(J2000) = -63d 46' 44"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 10 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began taking data at 22:52:39 UT, 68 seconds after the BAT trigger. The XRT on-board centroid algorithm did not find a source, however analysis of TDRSS data reveals a bright, fading uncatalogued point source at RA, Dec 269.5407, -63.7933 which is:
```
   RA(J2000)  =  17h 58m 09.8s
   Dec(J2000) = -63d 47' 35.7"
```
with an estimated uncertainty of 3.8 arcseconds radius (90% confidence). This position lies 62 arcsec from the BAT position.
UVOT took a finding chart exposure of 400 seconds with the V filter starting 65 seconds after the BAT trigger. Automated source detection did not find an afterglow candidate, but visual inspection suggests a marginal detection at RA, DEC = 269.5418, -63.7930 with an estimated magnitude of 18.6. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18.0 mag. No correction has been made for the expected extinction of about 0.2 magnitudes.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 30 Mar 07 23:34:45 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     273180,   Seg_Num: 0
GRB_RA:          269.5418d {+17h 58m 10.03s} (J2000),
                 269.7165d {+17h 58m 51.96s} (current),
                 268.3358d {+17h 53m 20.59s} (1950)
GRB_DEC:         -63.7929d {-63d 47' 34.4"} (J2000),
                 -63.7932d {-63d 47' 35.3"} (current),
                 -63.7877d {-63d 47' 15.8"} (1950)
GRB_ERROR:       0.7 [arcsec radius, statistical only]
GRB_MAG:         18.60 +/- 3.00 [mag]
FILTER:          3, V
IMG_START_DATE:  14189 TJD;    89 DOY;   07/03/30
IMG_START_TIME:  82357.00 SOD {22:52:37.00} UT,   65.8 [sec] since BAT Trigger Time
SUN_POSTN:         9.08d {+00h 36m 20s}   +3.91d {+03d 54' 54"}
SUN_DIST:         97.64 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      161.70d {+10h 46m 48s}   +8.34d {+08d 20' 23"}
MOON_DIST:       105.38 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      329.89,-18.58 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      269.73,-40.35 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This optical candidate was identified by visual   
COMMENTS:        inspection and its reality is uncertain.

GCN Circular #6233
J.French (UCD), P.Kubanek (U. Valencia) and M.Jelinek (IAA), report on behalf of the Watcher collaboration:
The Watcher 40cm automated telescope at the Boyden Observatory, South Africa, began imaging the field of GRB 070330 (Grupe et al, GCN 6232) at 22:57:40 UTC, 6.15min after the BAT trigger. An initial series of 10s unfiltered exposures shows no new source down to a limiting magnitude of approx. 16 mag. Stacking multiple frames to create a combined 848s exposure with a mean time of 23:06:40 UTC (15.15min post-trigger) fails to reveal any new source down a 3-sigma limiting magnitude of 18.2 mag. Further observations are continuing.
GCN Circular #6234
GRB 070330: Swift-XRT refined analysis
D. Grupe (PSU) reports on behalf of the Swift/XRT team
We have analyzed the first two orbits of GRB 070330 (Grupe et al., GCN 6232) with total observing times of 2.7 ks in photon counting mode in the Swift XRT. The Photon Counting mode image provides a refined XRT position at Ra, Dec= 269.5407, -63.7934, which is
```
RA(J2000) = 17h 58m 09.8s
Dec(J2000) = -63d 47' 36.1"
```
with an error of 3.6" (90% confidence). This position is 0.4" away from the preliminary XRT position reported in GCN 6232.
The X-ray light curve displays a flare at the beginning of the XRT observation with a peak at about 230s after the burst. The decay slope after the flare is 1.10+/-0.12. The prediction 24h after the burst is a 0.3-10.0 keV flux of 6e-14 ergs/s/cm2 or about 1.3e-3 XRT counts/s.
The photon counting mode data can be fitted by a single absorbed power law model with a photon index Gamma=1.72+/-0.11 and an absorption column density consistent with the Galactic value (7.14e20 cm^-2; Dickey & Lockman, 1990).
More analysis of the data will be presented in the GCN report.
This circular is an official product of the Swift XRT team.
GCN Circular #6235
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 070330 detected by SWIFT (trigger 273180) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile.
The observations started 2.5 hours after the GRB trigger (the field was not risen when the burst occured).
The date of trigger : t0 = 2007-03-30T22:51:30.816
We co-added a series of 180s exposures: We do not detect any OT at the XRT position (Grupe et al. GCNC 6234) with a limiting magnitude of:
t0+2.5h to t0+3.5h : R > 17.4
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=329.9005 lat=-18.5620 and the galactic extinction in R band is 2.0 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.
GCN Circular #6236
B. E. Cobb, part of the larger SMARTS consortium, reports:
Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained optical/IR imaging of the error region of GRB 070330 (Grupe et al. GCN 6232) with a mid-exposure time of ~7.6 hours post-burst (2007-03-31 06:25 UT). Total summed exposure times amounted to 36 minutes in I and 30 minutes in J.
No source is detected at the position of the X-ray afterglow (Grupe et al. GCN 6234) to approximate limiting magnitudes of I > 20.5 and J > 18.6. Magnitudes are calibrated using USNO-B1.0 values for I, and 2MASS values for J.
GCN Circular #6237
E. Fenimore (LANL), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), N. Gehrels (GSFC), D. Grupe (PSU), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team:
Using the data set from T-240 to T+963 sec from the full telemetry downlink, we report further analysis of BAT GRB 070330 (trigger #273180) (Grupe et al., GCN Circ. 6232). The BAT ground-calculated position is RA, Dec = 269.533, -63.799 deg which is
```
   RA(J2000)  =  17h 58m  7.9s 
   Dec(J2000) = -63d 47' 54.7" 
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 80%.
The mask weighted light curve consists of a single FRED-like peak. T90 (15-350 keV) is 9.0 +- 1 sec (estimated error including systematics).
The time-averaged spectrum from T-1.1 to T+8.9 is best fit by a power law with an exponential cutoff. This fit gives a photon index -0.33 +- 1.76, and Epeak of 36.3 +- 6.1 keV (chi squared 56.05 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.8 +- 0.3 x 10^-07 erg/cm2 and the 1-sec peak flux measured from T-0.06 sec in the 15-150 keV band is 0.9 +- 0.1 ph/cm2/sec. A fit to a simple power law gives a photon index of 2.06 +- 0.22 (chi squared 66.7 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
GCN Circular #6238
N.P.M. Kuin (MSSL-UCL), D. Grupe (PSU), P. Brown (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began taking data in the field of GRB070330 54s after the BAT trigger (Grupe et al., GCN 6232). The afterglow is only detected in the first UVOT V exposure, with a magnitude of V=18.69+/-0.24, after which the afterglow had decayed below the UVOT detection threshold, suggesting a decay rate of alpha_V > 0.8. The refined UVOT afterglow position is
```
RA (J2000)  = 17:58:09.98 (269.5426)
Dec (J2000) = -63:47:34.80 (-63.7930)
```
We note that the refined position is 0.5" away from the preliminary UVOT position reported in GCN 6232. The photometry results are given below for the 5 UVOT filters in which observations were made. Due to the presence of a bright star no observations could be obtained in the UVW2 and white filters.
```
Filter  Mid_T(s)   Exp(s)  Mag
V       462        393     18.69+/-0.24
V       33978      1632    > 21.45 (3-sigma upper limit)
M2      25521      2814    > 18.35 (3-sigma upper limit)    `
W1      20282      1998    > 18.36 (3-sigma upper limit)
U       25521      2814    > 21.60 (3-sigma upper limit)
B       30318      3305    > 18.15 (3-sigma upper limit)
```
Mid_T is the weighted mid time of the exposure since the BAT trigger. These magnitudes are not corrected for the expected reddening of E(B-V)=0.063.
For the time being it is not possible to provide a redshift given the low signal-to-noise ratio of the data. Further analysis is ongoing. A high (~4) redshift is possible and we encourage further ground follow-up.
GCN Report 43.1
GCN_Report 43.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_43_1.pdf by D. Grupe at PSU titled: "Swift Observations of GRB 070330"
GCN Report 43.2
GCN_Report 43.2 has been posted: http://gcn.gsfc.nasa.gov/reports/report_43_2.pdf by D. Grupe at PSU titled: "Final Swift Observations of GRB 070330"
GCN Circular #6307
P. Schady (MSSL-UCL), D. Grupe (PSU) report on behalf of the Swift/UVOT team
An error has been noted in the UVOT position for the optical afterglow of GRB 070330 (GCN 6238). There is a typo in the RA expressed as degrees. The correct refined UVOT afterglow position is
```
RA (J2000)  = 17:58:09.98 (269.5416)
Dec (J2000) = -63:47:34.80,6 (-63.7930)
```
to a certainty of 0.5".

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Jochen Greiner, last update: 19-Apr-2007 [Disclaimer]