Gamma-ray Burst 110201A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Feb 11 09:35:32 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     444230,   Seg_Num: 0
GRB_RA:          137.065d {+09h 08m 16s} (J2000),
                 138.879d {+09h 15m 31s} (current),
                 127.415d {+08h 29m 40s} (1950)
GRB_DEC:         +88.608d {+88d 36' 27"} (J2000),
                 +88.562d {+88d 33' 42"} (current),
                 +88.797d {+88d 47' 49"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5308 [cnts]    Image_Peak=278 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   155     E_range: 50-350 keV
BKG_INTEN:       24611 [cnts]
BKG_TIME:        34497.37 SOD {09:34:57.37} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15593 TJD;    32 DOY;   11/02/01
GRB_TIME:        34508.89 SOD {09:35:08.89} UT
GRB_PHI:         -95.98 [deg]
GRB_THETA:        10.42 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     36.24 [sigma]
IMAGE_SIGNIF:    9.80 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3  +0  +0  +0 +31  +0 
SUN_POSTN:       314.63d {+20h 58m 31s}  -17.15d {-17d 08' 44"}
SUN_DIST:        108.58 [deg]   Sun_angle= 11.7 [hr] (West of Sun)
MOON_POSTN:      294.24d {+19h 36m 59s}  -19.66d {-19d 39' 23"}
MOON_DIST:       110.96 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      124.23, 27.91 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       92.47, 65.59 [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 = 174.63,4.61 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 01 Feb 11 09:35:28 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     318245712
GRB_RA:          177.250d {+11h 49m 00s} (J2000),
                 177.397d {+11h 49m 35s} (current),
                 176.584d {+11h 46m 20s} (1950)
GRB_DEC:         +59.833d {+59d 49' 60"} (J2000),
                 +59.772d {+59d 46' 18"} (current),
                 +60.111d {+60d 06' 41"} (1950)
GRB_ERROR:       11.30 [deg radius, statistical plus systematic]
GRB_INTEN:       147 [cnts/sec]
DATA_SIGNIF:     5.10 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        15593 TJD;    32 DOY;   11/02/01
GRB_TIME:        34510.25 SOD {09:35:10.25} UT
GRB_PHI:         336.00 [deg]
GRB_THETA:       155.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      -0.19
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   2%  Generic SGR
DETECTORS:       0,0,0, 0,1,0, 1,0,0, 0,0,0, 0,0,
SUN_POSTN:       314.63d {+20h 58m 31s}  -17.15d {-17d 08' 44"}
SUN_DIST:        127.44 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      294.24d {+19h 36m 59s}  -19.66d {-19d 39' 23"}
MOON_DIST:       120.32 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      136.77, 55.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      143.90, 51.59 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 37.28,6.08 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 01 Feb 11 09:35:43 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     318245712
GRB_RA:          139.960d {+09h 19m 50s} (J2000),
                 140.695d {+09h 22m 47s} (current),
                 136.436d {+09h 05m 45s} (1950)
GRB_DEC:         +86.220d {+86d 13' 12"} (J2000),
                 +86.172d {+86d 10' 21"} (current),
                 +86.428d {+86d 25' 40"} (1950)
GRB_ERROR:       4.75 [deg radius, statistical only]
DATA_SIGNIF:     13.70 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15593 TJD;    32 DOY;   11/02/01
GRB_TIME:        34510.25 SOD {09:35:10.25} UT
GRB_PHI:         310.00 [deg]
GRB_THETA:       132.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       314.63d {+20h 58m 31s}  -17.15d {-17d 08' 44"}
SUN_DIST:        110.95 [deg]   Sun_angle= 11.6 [hr] (West of Sun)
MOON_POSTN:      294.25d {+19h 36m 59s}  -19.66d {-19d 39' 21"}
MOON_DIST:       113.07 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      126.39, 29.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       96.61, 63.98 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Feb 11 09:36:23 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     444230,   Seg_Num: 0
POINT_RA:        136.731d {+09h 06m 55s} (J2000)
POINT_DEC:       +88.597d {+88d 35' 50"} (J2000)
IMG_START_DATE:  15593 TJD;    32 DOY;   11/02/01
IMG_START_TIME:  34575.48 SOD {09:36:15.48} UT,   66.6 [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:     Tue 01 Feb 11 09:39:03 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     444230,   Seg_Num: 0
GRB_RA:          137.065d {+09h 08m 16s} (J2000),
                 138.879d {+09h 15m 31s} (current),
                 127.415d {+08h 29m 40s} (1950)
GRB_DEC:         +88.608d {+88d 36' 27"} (J2000),
                 +88.562d {+88d 33' 42"} (current),
                 +88.797d {+88d 47' 49"} (1950)
GRB_DATE:        15593 TJD;    32 DOY;   11/02/01
GRB_TIME:        34508.89 SOD {09:35:08.89} UT
TRIGGER_INDEX:   155
GRB_PHI:         -95.98 [deg]
GRB_THETA:        10.42 [deg]
DELTA_TIME:      -31.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     36.24 [sigma]
IMAGE_SIGNIF:    9.80 [sigma]
LC_URL:          sw00444230000msb.lc
SUN_POSTN:       314.63d {+20h 58m 32s}  -17.15d {-17d 08' 42"}
SUN_DIST:        108.58 [deg]   Sun_angle= 11.7 [hr] (West of Sun)
MOON_POSTN:      294.28d {+19h 37m 06s}  -19.65d {-19d 38' 55"}
MOON_DIST:       110.96 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      124.23, 27.91 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       92.47, 65.59 [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 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 = 174.63,4.61 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Feb 11 09:40:07 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     444230,   Seg_Num: 0
GRB_RA:          137.5839d {+09h 10m 20.13s} (J2000),
                 139.3786d {+09h 17m 30.85s} (current),
                 128.0197d {+08h 32m 04.73s} (1950)
GRB_DEC:         +88.6059d {+88d 36' 21.2"} (J2000),
                 +88.5597d {+88d 33' 34.8"} (current),
                 +88.7972d {+88d 47' 49.9"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15593 TJD;    32 DOY;   11/02/01
IMG_START_TIME:  34589.00 SOD {09:36:29.00} UT,   80.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       314.63d {+20h 58m 32s}  -17.14d {-17d 08' 41"}
SUN_DIST:        108.58 [deg]   Sun_angle= 11.7 [hr] (West of Sun)
MOON_POSTN:      294.29d {+19h 37m 09s}  -19.65d {-19d 38' 47"}
MOON_DIST:       110.95 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      124.23, 27.92 [deg] galactic lon,lat of the burst
ECL_COORDS:       92.49, 65.60 [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:     Tue 01 Feb 11 09:41:50 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     444230,   Seg_Num: 0
POINT_RA:        136.745d {+09h 06m 59s} (J2000)
POINT_DEC:       +88.594d {+88d 35' 40"} (J2000)
POINT_ROLL:      2.131d
IMG_START_DATE:  15593 TJD;    32 DOY;   11/02/01
IMG_START_TIME:  34635.78 SOD {09:37:15.78} UT,   126.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.583
N_STARS:         190
X_OFFSET:        345 [pixels]
Y_OFFSET:        315 [pixels]
X_MAX:           1784 [pixels]
Y_MAX:           1754 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00444230000msufc0126.fits
SUN_POSTN:       314.64d {+20h 58m 32s}  -17.14d {-17d 08' 40"}
SUN_DIST:        108.59 [deg]   Sun_angle= 11.7 [hr] (West of Sun)
MOON_POSTN:      294.30d {+19h 37m 12s}  -19.64d {-19d 38' 34"}
MOON_DIST:       110.97 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      124.25, 27.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.48, 65.58 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Feb 11 09:42:14 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     444230,   Seg_Num: 0
GRB_RA:          137.5801d {+09h 10m 19.22s} (J2000),
                 139.3743d {+09h 17m 29.83s} (current),
                 128.0190d {+08h 32m 04.56s} (1950)
GRB_DEC:         +88.6054d {+88d 36' 19.4"} (J2000),
                 +88.5592d {+88d 33' 33.0"} (current),
                 +88.7967d {+88d 47' 48.1"} (1950)
GRB_ERROR:       2.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15593 TJD;    32 DOY;   11/02/01
IMG_START_TIME:  34589.00 SOD {09:36:29.00} UT,   80.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       314.64d {+20h 58m 33s}  -17.14d {-17d 08' 39"}
SUN_DIST:        108.58 [deg]   Sun_angle= 11.7 [hr] (West of Sun)
MOON_POSTN:      294.30d {+19h 37m 13s}  -19.64d {-19d 38' 31"}
MOON_DIST:       110.95 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      124.23, 27.92 [deg] galactic lon,lat of the burst
ECL_COORDS:       92.49, 65.60 [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:     Tue 01 Feb 11 09:42:24 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     444230,   Seg_Num: 0
POINT_RA:        136.745d {+09h 06m 59s} (J2000)
POINT_DEC:       +88.594d {+88d 35' 40"} (J2000)
POINT_ROLL:      2.131d
IMG_START_DATE:  15593 TJD;    32 DOY;   11/02/01
IMG_START_TIME:  34635.78 SOD {09:37:15.78} UT,   126.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.583
N_STARS:         190
X_OFFSET:        345 [pixels]
Y_OFFSET:        315 [pixels]
X_MAX:           1784 [pixels]
Y_MAX:           1754 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00444230000msufc0126.fits
SUN_POSTN:       314.64d {+20h 58m 33s}  -17.14d {-17d 08' 39"}
SUN_DIST:        108.59 [deg]   Sun_angle= 11.7 [hr] (West of Sun)
MOON_POSTN:      294.31d {+19h 37m 13s}  -19.64d {-19d 38' 30"}
MOON_DIST:       110.96 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      124.25, 27.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.48, 65.58 [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:     Tue 01 Feb 11 09:43:16 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     444230,   Seg_Num: 0
POINT_RA:        136.745d {+09h 06m 59s} (J2000)
POINT_DEC:       +88.594d {+88d 35' 40"} (J2000)
ROLL:            2.131d
IMG_START_DATE:  15593 TJD;    32 DOY;   11/02/01
IMG_START_TIME:  34635.78 SOD {09:37:15.78} UT,   126.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     318245842
X_OFFSET:        904 [pixels]
Y_OFFSET:        874 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1064
Y_GRB_POS:       1034
BINNING_INDEX:   1
IM_URL:          sw00444230000msuni0133.fits
SUN_POSTN:       314.64d {+20h 58m 33s}  -17.14d {-17d 08' 39"}
SUN_DIST:        108.59 [deg]   Sun_angle= 11.7 [hr] (West of Sun)
MOON_POSTN:      294.31d {+19h 37m 15s}  -19.64d {-19d 38' 23"}
MOON_DIST:       110.96 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      124.25, 27.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.48, 65.58 [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:     Tue 01 Feb 11 09:43:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     444230,   Seg_Num: 0
POINT_RA:        136.745d {+09h 06m 59s} (J2000)
POINT_DEC:       +88.594d {+88d 35' 40"} (J2000)
ROLL:            2.131d
IMG_START_DATE:  15593 TJD;    32 DOY;   11/02/01
IMG_START_TIME:  34635.78 SOD {09:37:15.78} UT,   126.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     318245842
X_OFFSET:        904 [pixels]
Y_OFFSET:        874 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1064
Y_GRB_POS:       1034
BINNING_INDEX:   1
IM_URL:          sw00444230000msuni0133.fits
SUN_POSTN:       314.64d {+20h 58m 33s}  -17.14d {-17d 08' 39"}
SUN_DIST:        108.59 [deg]   Sun_angle= 11.7 [hr] (West of Sun)
MOON_POSTN:      294.32d {+19h 37m 16s}  -19.64d {-19d 38' 21"}
MOON_DIST:       110.96 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      124.25, 27.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.48, 65.58 [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 #11622
M. H. Siegel (PSU), A. P. Beardmore (U Leicester), S. Campana (INAF-OAB), V. D'Elia (ASDC), P. A. Evans (U Leicester), J. M. Gelbord (PSU), D. Grupe (PSU), S. T. Holland (CRESST/USRA/GSFC), E. A. Hoversten (PSU), V. Mangano (INAF-IASFPA), C. B. Markwardt (NASA/GSFC), C. Pagani (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), P. Romano (INAF-IASFPA), B. Sbarufatti (INAF-OAB/IASFPA) and G. Stratta (ASDC) report on behalf of the Swift Team:
At 09:35:08 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110201A (trigger=444230). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 137.065, +88.608 which is
```
   RA(J2000) = 09h 08m 16s
   Dec(J2000) = +88d 36' 27"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 17 sec. The peak count rate was ~4500 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 09:36:15.5 UT, 66.6 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 137.5802, 88.6054 which is equivalent to:
```
   RA(J2000)  = 09h 10m 19.25s
   Dec(J2000) = +88d 36' 19.3"
```
with an uncertainty of 2.3 arcseconds (radius, 90% containment). This location is 45 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 in excess of the Galactic value (7.08 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 3.1 (+3.40/-2.79) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 126 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 19.2 mag. The coverage of the XRT error circle by the 8'x8' region for the list of sources generated on-board is uncertain because the large number of sources filled the available telemetry. No correction has been made for the expected extinction corresponding to E(B-V) of 0.35.
Burst Advocate for this burst is M. H. Siegel (siegel 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:     Tue 01 Feb 11 09:54:38 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     444230,   Seg_Num: 0
POINT_RA:        136.744d {+09h 06m 58s} (J2000)
POINT_DEC:       +88.595d {+88d 35' 41"} (J2000)
POINT_ROLL:      2.130d
IMG_START_DATE:  15593 TJD;    32 DOY;   11/02/01
IMG_START_TIME:  35367.59 SOD {09:49:27.59} UT,   858.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.424
N_STARS:         190
X_OFFSET:        345 [pixels]
Y_OFFSET:        315 [pixels]
X_MAX:           1784 [pixels]
Y_MAX:           1754 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00444230000msufc0858.fits
SUN_POSTN:       314.64d {+20h 58m 35s}  -17.14d {-17d 08' 31"}
SUN_DIST:        108.59 [deg]   Sun_angle= 11.7 [hr] (West of Sun)
MOON_POSTN:      294.42d {+19h 37m 40s}  -19.62d {-19d 36' 55"}
MOON_DIST:       110.94 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      124.25, 27.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.48, 65.58 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Feb 11 09:54:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     444230,   Seg_Num: 0
POINT_RA:        136.744d {+09h 06m 58s} (J2000)
POINT_DEC:       +88.595d {+88d 35' 41"} (J2000)
POINT_ROLL:      2.130d
IMG_START_DATE:  15593 TJD;    32 DOY;   11/02/01
IMG_START_TIME:  35367.59 SOD {09:49:27.59} UT,   858.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.424
N_STARS:         190
X_OFFSET:        345 [pixels]
Y_OFFSET:        315 [pixels]
X_MAX:           1784 [pixels]
Y_MAX:           1754 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00444230000msufc0858.fits
SUN_POSTN:       314.64d {+20h 58m 35s}  -17.14d {-17d 08' 30"}
SUN_DIST:        108.59 [deg]   Sun_angle= 11.7 [hr] (West of Sun)
MOON_POSTN:      294.42d {+19h 37m 40s}  -19.61d {-19d 36' 53"}
MOON_DIST:       110.94 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      124.25, 27.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.48, 65.58 [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:     Tue 01 Feb 11 09:55:48 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     444230,   Seg_Num: 0
POINT_RA:        136.744d {+09h 06m 58s} (J2000)
POINT_DEC:       +88.595d {+88d 35' 41"} (J2000)
ROLL:            2.130d
IMG_START_DATE:  15593 TJD;    32 DOY;   11/02/01
IMG_START_TIME:  35367.59 SOD {09:49:27.59} UT,   858.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     318246574
X_OFFSET:        904 [pixels]
Y_OFFSET:        874 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1064
Y_GRB_POS:       1034
BINNING_INDEX:   1
IM_URL:          sw00444230000msuni0865.fits
SUN_POSTN:       314.65d {+20h 58m 35s}  -17.14d {-17d 08' 30"}
SUN_DIST:        108.59 [deg]   Sun_angle= 11.7 [hr] (West of Sun)
MOON_POSTN:      294.43d {+19h 37m 42s}  -19.61d {-19d 36' 46"}
MOON_DIST:       110.94 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      124.25, 27.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.48, 65.58 [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:     Tue 01 Feb 11 09:56:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     444230,   Seg_Num: 0
POINT_RA:        136.744d {+09h 06m 58s} (J2000)
POINT_DEC:       +88.595d {+88d 35' 41"} (J2000)
ROLL:            2.130d
IMG_START_DATE:  15593 TJD;    32 DOY;   11/02/01
IMG_START_TIME:  35367.59 SOD {09:49:27.59} UT,   858.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     318246574
X_OFFSET:        904 [pixels]
Y_OFFSET:        874 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1064
Y_GRB_POS:       1034
BINNING_INDEX:   1
IM_URL:          sw00444230000msuni0865.fits
SUN_POSTN:       314.65d {+20h 58m 35s}  -17.14d {-17d 08' 30"}
SUN_DIST:        108.59 [deg]   Sun_angle= 11.7 [hr] (West of Sun)
MOON_POSTN:      294.43d {+19h 37m 43s}  -19.61d {-19d 36' 44"}
MOON_DIST:       110.94 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      124.25, 27.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.48, 65.58 [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 #11623
V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, V.Shumkov, S.Shurpakov Sternberg Astronomical Institute, Moscow State University
V.Krushinski, I.Zalozhnich, A. Popov Ural State University, Kourovka
K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in MASTER-Amur was pointed to the GRB110201A 21 sec s after notice time and 46 sec after GRB time at 2011-02-01 09:35:54.771 UT. On our first (10s exposure) set we haven`t found optical transient within SWIFT-XRT error-box. The 3-sigma upper limit has been about V = 14.5mag The message may be cited.
mailto: lipunov@sai.msu.ru
GCN Circular #11624
H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. H. Siegel (PSU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+878 sec from the recent telemetry downlink, we report further analysis of BAT GRB 110201A (trigger #444230) (Siegel, et al., GCN Circ. 11622). The BAT ground-calculated position is RA, Dec = 137.489, 88.610 deg, which is
```
   RA(J2000)  =  09h 09m 57.3s 
   Dec(J2000) = +88d 36' 36.9" 
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 97%.
The mask-weighted light curve shows 3 or 4 overlapping peaks starting at ~T-2 sec, peaking at ~T_zero, and ending at ~T+30 sec. T90 (15-350 keV) is 13.0 +- 2.2 sec (estimated error including systematics).
The time-averaged spectrum from T-2.8 to T+13.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.09 +- 0.11. The fluence in the 15-150 keV band is 7.0 +- 0.5 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.28 sec in the 15-150 keV band is 1.1 +- 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/444230/BA/
GCN Circular #11625
M. De Pasquale (MSSL-UCL) and M.H Siegel (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 110201A 127 s after the BAT trigger (Siegel et al., GCN Circ. 11622). No optical afterglow consistent with the XRT position is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)  Exp(s)   Mag

u_FC               127         377     246    >20.0
u                  127        2348     627    >20.4
v                  433        2424     253    >19.5
b                  382        2373     272    >20.4
w1                 482        2324     233    >19.7
m2                 457        2449     233    >19.6
w2                 408        2400     253    >19.1
```
We note that a bright star (V=7) is a few arcminutes from the GRB position.
The values quoted above are not corrected for the strong Galactic extinction due to the reddening of E(B-V) = 0.35 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #11626
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 110201A (Siegel et al., GCN 11622) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on2011-02-01 09:59:39 UT (~25 min. after the burst). We did not find any new point source within the XRT error circle (Siegel et al., GCNC 11622) in all the three bands.
Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration.
```
T0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic
------------------------------------------------------
0.16707    13:35:43  5880.0     >21.3  >21.3  >18.7
------------------------------------------------------
```
T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]
GCN Circular #11627
D. Grupe and M. H. Siegel (PSU) report on behalf of the Swift-XRT team:
We have analyzed 21 ks of XRT data for GRB 110201A (Siegel et al. GCN Circ. 11622), from 54 s to 83.0 ks after the BAT trigger. The data comprise 6 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode.
The light curve can be modeled with a broken power-law model with an initial decay slope of alpha-1 = 3.25 (+0.40, -0.66) and a break at Tbreak-1 = 380 (+120, -55) s. After this break the afterglow decays with a slope of alpha-2 = 1.03 (+0.12, -0.11).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.04 (+0.26, -0.29). The best-fitting absorption column is 3.1 (+0.5, -1.0) x 10^21 cm^-2, in excess of the Galactic value of 2.8 x 10^20 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 (7.1 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     3.1 (+0.5, -1.0) x 10^21 cm^-2
Galactic foreground: 2.8 x 10^20 cm^-2
Excess significance: 5.3 sigma
Photon index:	     2.04 (+0.26, -0.29)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00444230.
This circular is an official product of the Swift-XRT team.
GCN Circular #11688
V. Rumyantsev (CrAO), A. Pozanenko (IKI), =A0A. Volnova (SAI MSU), E. Klunko (ISTP) report on behalf of larger GRB =A0follow-up collaboration:
We observed =A0the field of the Swift GRB 110201A (Siegel et al., GCN 11622) with Shajn telescope of CrAO in filter R between =A0Feb. 01 (UT) 17:01 - 18:04, and with AZT-33IK telescope =A0between Feb. 01 (UT) 16:31 - 17:07. Using stacked image of CrAO observations we detect =A0a diffuse source (A) at ~4" offset of a center of the XRT error circle (Siegel et al., GCN 11622), see also http://www.swift.ac.uk/sper/444230/. =A0The coordinates of the center of the source (A) are (J2000) RA =3D 09:10:29.84, Dec =3D =A0+88:36:17.5 with uncertainty of 0.5" in both coordinates.
The photometry of the source is based on the USNO-B1.0 star 1786-0003311 (09:12:09.70 +88:36:01.0) assuming R=3D17.64 is following:
```
T0+   Filter,  Exposure, source A, mag, UpperLimit
(mid, d)         (s)

0.3305  R       45x60     21.9 +/- 0.1  23.4
```
Would be the source (A) a host galaxy of GRB 110201A, the galaxy could be a relatively close =A0(z <1) taking into account its brightness. The finding chart can be found at http://grb.rssi.ru/GRB110201A/GRB110201a_110201_R_ZTSh.gif
GCN Circular #11698
M. Onodera (ETH Zurich), E. Daddi (CEA/Saclay), I. Tanaka (Subaru Telescope), and Y. Yamada (NAOJ) report:
We observed the field of GRB 110201A (Siegel et al., GCN Circ. 11622) in Ks-band with MOIRCS on the Subaru telescope.
The observations was carried out on 2011-02-02 16:27:33 UT (~31 hours after the burst) for 200 seconds integration and on 2011-02-03 16:16:20 UT (~54.5 hours after the burst) for 520 seconds integration. Within the XRT error circle, we did not find any evidence for fading sources. On the other hand, a faint galaxy is detected at (RA, Dec)=(9:10:23.01, +88:36:21.82). Our preliminary photometry shows the galaxy is Ks=19.7 (Vega) or Ks=21.5 (AB) with an error of ~0.2 mag. There is another source slightly outside of the XRT error circle at (RA, Dec)=(9:10:31.5, +88:36:18.4) with an magnitude of Ks=19.3 (Vega) or Ks=21.1 (AB) with an error of ~0.15 mag. Flux calibration was carried out by using 2MASS sources.
Images are provided for consultation at the following web site: http://www.astro.phys.ethz.ch/people/monodera/grb110201a/
GCN Report 325.1
GCN_Report 325.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_325_1.pdf by M.H. Siegel at PSU titled: "Final Swift Observations of GRB 110201A"

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Jochen Greiner, last update: 11-Feb-2011 [Disclaimer]