Gamma-ray Burst 130603A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Jun 13 06:00:28 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     557274,   Seg_Num: 0
GRB_RA:           86.954d {+05h 47m 49s} (J2000),
                  87.728d {+05h 50m 55s} (current),
                  84.078d {+05h 36m 19s} (1950)
GRB_DEC:         +82.934d {+82d 56' 02"} (J2000),
                 +82.937d {+82d 56' 15"} (current),
                 +82.912d {+82d 54' 44"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       23850 [cnts]    Image_Peak=706 [image_cnts]
TRIGGER_DUR:     8.192 [sec] 
TRIGGER_INDEX:   477     E_range: 25-100 keV
BKG_INTEN:       162102 [cnts]
BKG_TIME:        21485.37 SOD {05:58:05.37} UT
BKG_DUR:         64 [sec]
GRB_DATE:        16446 TJD;   154 DOY;   13/06/03
GRB_TIME:        21572.66 SOD {05:59:32.66} UT
GRB_PHI:         -22.03 [deg]
GRB_THETA:        18.66 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     9.00 [sigma]
IMAGE_SIGNIF:    11.20 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +2  +1  +0  +0 -48  +0 
SUN_POSTN:        71.39d {+04h 45m 35s}  +22.34d {+22d 20' 07"}
SUN_DIST:         60.90 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:       10.22d {+00h 40m 53s}   +7.68d {+07d 40' 58"}
MOON_DIST:        80.85 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      130.43, 24.99 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       89.26, 59.50 [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 = 171.59,-4.86 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Jun 13 06:03:08 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     557274,   Seg_Num: 0
GRB_RA:           86.954d {+05h 47m 49s} (J2000),
                  87.728d {+05h 50m 55s} (current),
                  84.078d {+05h 36m 19s} (1950)
GRB_DEC:         +82.934d {+82d 56' 02"} (J2000),
                 +82.937d {+82d 56' 15"} (current),
                 +82.912d {+82d 54' 44"} (1950)
GRB_DATE:        16446 TJD;   154 DOY;   13/06/03
GRB_TIME:        21572.66 SOD {05:59:32.66} UT
TRIGGER_INDEX:   477
GRB_PHI:         -22.03 [deg]
GRB_THETA:        18.66 [deg]
DELTA_TIME:      71.00 [sec]
TRIGGER_DUR:     8.192 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     9.00 [sigma]
IMAGE_SIGNIF:    11.20 [sigma]
LC_URL:          sw00557274000msb.lc
SUN_POSTN:        71.40d {+04h 45m 35s}  +22.34d {+22d 20' 07"}
SUN_DIST:         60.90 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:       10.24d {+00h 40m 59s}   +7.69d {+07d 41' 25"}
MOON_DIST:        80.84 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      130.43, 24.99 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       89.26, 59.50 [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 = 171.59,-4.86 [deg].

GCN Circular #14731
A. Melandri (INAF-OAB), C. Gronwall (PSU), C. B. Markwardt (NASA/GSFC), D. M. Palmer (LANL) and T. Sakamoto (AGU) report on behalf of the Swift Team:
At 05:59:32 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130603A (trigger=557274). Swift could not immediately slew to the burst due to an Earth limb constraint. The BAT on-board calculated location is RA, Dec 86.954, +82.934 which is
```
   RA(J2000) = 05h 47m 49s
   Dec(J2000) = +82d 56' 02"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single FRED structure with a duration of about 100 sec. The peak count rate was ~1275 counts/sec (15-350 keV), at ~1 sec after the trigger.
Due to an observing constraint, Swift will not slew until T0+49.7 minutes. There will be no XRT or UVOT data until this time.
Burst Advocate for this burst is A. Melandri (andrea.melandri 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:     Mon 03 Jun 13 06:51:24 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     557274,   Seg_Num: 0
POINT_RA:         87.020d {+05h 48m 05s} (J2000)
POINT_DEC:       +82.956d {+82d 57' 21"} (J2000)
IMG_START_DATE:  16446 TJD;   154 DOY;   13/06/03
IMG_START_TIME:  24676.25 SOD {06:51:16.25} UT,   3103.6 [sec] since BAT Trigger Time
COUNTS:          29    Min_needed= 20
STD_DEV:         11.16   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    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:     Mon 03 Jun 13 06:54:57 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     557274,   Seg_Num: 0
POINT_RA:         87.020d {+05h 48m 05s} (J2000)
POINT_DEC:       +82.956d {+82d 57' 22"} (J2000)
POINT_ROLL:      196.526d
IMG_START_DATE:  16446 TJD;   154 DOY;   13/06/03
IMG_START_TIME:  24679.97 SOD {06:51:19.97} UT,   3107.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.775
N_STARS:         46
X_OFFSET:        640 [pixels]
Y_OFFSET:        459 [pixels]
X_MAX:           1599 [pixels]
Y_MAX:           1418 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    11
SL_URL:          sw00557274000msufc3107.fits
SUN_POSTN:        71.43d {+04h 45m 44s}  +22.34d {+22d 20' 23"}
SUN_DIST:         60.92 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:       10.68d {+00h 42m 43s}   +7.83d {+07d 50' 04"}
MOON_DIST:        80.66 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      130.41, 25.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       89.28, 59.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Jun 13 06:55:18 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     557274,   Seg_Num: 0
POINT_RA:         87.020d {+05h 48m 05s} (J2000)
POINT_DEC:       +82.956d {+82d 57' 22"} (J2000)
POINT_ROLL:      196.526d
IMG_START_DATE:  16446 TJD;   154 DOY;   13/06/03
IMG_START_TIME:  24679.97 SOD {06:51:19.97} UT,   3107.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.775
N_STARS:         46
X_OFFSET:        640 [pixels]
Y_OFFSET:        459 [pixels]
X_MAX:           1599 [pixels]
Y_MAX:           1418 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    11
SL_URL:          sw00557274000msufc3107.fits
SUN_POSTN:        71.43d {+04h 45m 44s}  +22.34d {+22d 20' 23"}
SUN_DIST:         60.92 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:       10.68d {+00h 42m 43s}   +7.84d {+07d 50' 08"}
MOON_DIST:        80.66 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      130.41, 25.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       89.28, 59.52 [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:     Mon 03 Jun 13 06:55:37 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     557274,   Seg_Num: 0
GRB_RA:           86.8907d {+05h 47m 33.76s} (J2000),
                  87.6628d {+05h 50m 39.07s} (current),
                  84.0225d {+05h 36m 05.40s} (1950)
GRB_DEC:         +82.9096d {+82d 54' 34.5"} (J2000),
                 +82.9132d {+82d 54' 47.3"} (current),
                 +82.8875d {+82d 53' 15.1"} (1950)
GRB_ERROR:       4.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16446 TJD;   154 DOY;   13/06/03
IMG_START_TIME:  24688.00 SOD {06:51:28.00} UT,   3115.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        71.43d {+04h 45m 44s}  +22.34d {+22d 20' 23"}
SUN_DIST:         60.87 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:       10.68d {+00h 42m 44s}   +7.84d {+07d 50' 11"}
MOON_DIST:        80.63 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      130.45, 24.98 [deg] galactic lon,lat of the burst
ECL_COORDS:       89.24, 59.48 [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:     Mon 03 Jun 13 06:56:28 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     557274,   Seg_Num: 0
POINT_RA:         87.020d {+05h 48m 05s} (J2000)
POINT_DEC:       +82.956d {+82d 57' 22"} (J2000)
ROLL:            196.526d
IMG_START_DATE:  16446 TJD;   154 DOY;   13/06/03
IMG_START_TIME:  24679.97 SOD {06:51:19.97} UT,   3107.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     391935090
X_OFFSET:        959 [pixels]
Y_OFFSET:        778 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1119
Y_GRB_POS:       938
BINNING_INDEX:   1
IM_URL:          sw00557274000msuni3118.fits
SUN_POSTN:        71.43d {+04h 45m 44s}  +22.34d {+22d 20' 24"}
SUN_DIST:         60.92 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:       10.69d {+00h 42m 46s}   +7.84d {+07d 50' 20"}
MOON_DIST:        80.65 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      130.41, 25.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       89.28, 59.52 [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:     Mon 03 Jun 13 06:56:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     557274,   Seg_Num: 0
POINT_RA:         87.020d {+05h 48m 05s} (J2000)
POINT_DEC:       +82.956d {+82d 57' 22"} (J2000)
ROLL:            196.526d
IMG_START_DATE:  16446 TJD;   154 DOY;   13/06/03
IMG_START_TIME:  24679.97 SOD {06:51:19.97} UT,   3107.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     391935090
X_OFFSET:        959 [pixels]
Y_OFFSET:        778 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1119
Y_GRB_POS:       938
BINNING_INDEX:   1
IM_URL:          sw00557274000msuni3118.fits
SUN_POSTN:        71.43d {+04h 45m 44s}  +22.34d {+22d 20' 24"}
SUN_DIST:         60.92 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:       10.69d {+00h 42m 46s}   +7.84d {+07d 50' 24"}
MOON_DIST:        80.65 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      130.41, 25.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       89.28, 59.52 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Jun 13 06:59:22 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     557274,   Seg_Num: 0
GRB_RA:           86.8914d {+05h 47m 33.93s} (J2000),
                  87.6634d {+05h 50m 39.22s} (current),
                  84.0235d {+05h 36m 05.63s} (1950)
GRB_DEC:         +82.9087d {+82d 54' 31.3"} (J2000),
                 +82.9122d {+82d 54' 44.0"} (current),
                 +82.8866d {+82d 53' 11.8"} (1950)
GRB_ERROR:       0.8 [arcsec radius, statistical only]
GRB_MAG:         19.39 +/- 0.17 [mag]
FILTER:          10, White
IMG_START_DATE:  16446 TJD;   154 DOY;   13/06/03
IMG_START_TIME:  24678.00 SOD {06:51:18.00} UT,   3105.3 [sec] since BAT Trigger Time
SUN_POSTN:        71.44d {+04h 45m 45s}  +22.34d {+22d 20' 25"}
SUN_DIST:         60.87 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:       10.71d {+00h 42m 51s}   +7.85d {+07d 50' 49"}
MOON_DIST:        80.61 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      130.46, 24.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       89.24, 59.48 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN Circular #14732
A. Melandri (INAF/OAB) reports on behalf of the Swift team:
Swift-XRT observed the field of GRB 130603A (Melandri et al., GCN Circ. 14731) starting at T0+49.7 minutes due to an observing constraint. Using promptly downlinked data we find an uncatalogued X- ray source located at RA, Dec = 86.8938, 82.9099 which is equivalent to:
```
RA  (J2000.0) =  05 47 34.51
DEC (J2000.0) =  +82 54 35.7
```
with an uncertainty of 3.7 arcsec (radius, 90% containment).
A source is also detected by Swift-UVOT located at RA, Dec = 86.8914, 82.9087 which is equivalent to
```
RA  (J2000.0) =  05 47 33.9
DEC (J2000.0) =  +82 54 31.3
```
with an uncertainty of 0.8 arcsec (radius, 90% containment).
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).
GCN Circular #14733
D.N. Burrows (PSU), J.A. Kennea (PSU), M. Perri (ASDC), G. Tagliaferri (INAF-OAB), P.A. Evans (U. Leicester) and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team:
The XRT began observing the field of GRB 130603A at 06:51:16.2 UT, 3103.6 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 86.89380, 82.90992 which is equivalent to:
```
   RA(J2000)  = 05h 47m 34.51s
   Dec(J2000) = +82d 54' 35.7"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 90 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 (5.28 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 4.9 (+2.95/-2.45) x 10^21 cm^-2 (90% confidence).
GCN Circular #14734
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 130603A (Melandri et al., GCNC 14731) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2013-06-03 11:14:06 UT (~5.2 h after the burst). We detected the previously reported afterglow (Melandri, GCNC 14732) in all the three bands.
Photometric results of the OT are listed below. We used SDSS catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'  g'_err   Rc  Rc_err   Ic  Ic_err
-----------------------------------------------------------------------
0.22890    11:29:09    1560.0    18.3  0.3    18.4  0.2    18.1  0.3
0.24993    11:59:26    1500.0    18.9  0.3    18.8  0.2    18.2  0.3
------------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #14736
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), A. Melandri (INAF-OAB), D. M. Palmer (LANL), T. Sakamoto (AGU), G. Sato (ISAS), 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 recent telemetry downlinks, we report further analysis of BAT GRB 130603A (trigger #557274) (Melandri, et al., GCN Circ. 14731). The BAT ground-calculated position is RA, Dec = 86.859, 82.910 deg, which is
```
   RA(J2000)  =  05h 47m 26.1s 
   Dec(J2000) = +82d 54' 36.7" 
```
with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 98%.
The mask-weighted light curve shows mostly smooth peak starting at ~T-10 sec, peaking at ~T+11 sec, and ending at ~T+115 sec. T90 (15-350 keV) is 76 +- 19 sec (estimated error including systematics).
The time-averaged spectrum from T-19.5 to T+104.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.83 +- 0.12. The fluence in the 15-150 keV band is 1.9 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+11.27 sec in the 15-150 keV band is 0.8 +- 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/557274/BA/
GCN Circular #14737
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 4017 s of XRT Photon Counting mode data and 6 UVOT images for GRB 130603A, 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 = 86.89660, +82.90853 which is equivalent to:
```
RA (J2000): 05h 47m 35.18s
Dec (J2000): +82d 54' 30.7"
```
with an uncertainty of 1.5 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 #14738
M. De Pasquale (MSSL/UCL) and A. Melandri (INAF/OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130603A 3325 s after the BAT trigger (Melandri et al., GCN Circ. 14731). The uncatalogued source reported in Melandri et al., GCN Circ. 14732, is detected in the summed exposures.
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the summed exposures are:
```
Filter      T_start(s) T_stop(s)  Exp(s)           Mag

white         3686       5322       393       19.61 =B1 0.15
v             4097       5562       197      >19.02
b             3481      16641      1278       19.71 =B1 0.15
u             3275      15729      1278       19.19 =B1 0.13
uvw1          4507       4707       197       19.62 =B1 0.39 (2.8 sigma)
uvm2          4302       4502       197      >19.63
uvw2          3892       5528       393       20.25 =B1 0.37 (2.8 sigma)
```
The possible detection of the optical source in uw2 filter indicates a redshift z < ~1.5 for this event.
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) =3D 0.06 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #14740
A. Melandri (INAF-OAB) reports on behalf of the Swift-XRT team:
We have analysed 13 ks of XRT data for GRB 130603A (Melandri et al. GCN Circ. 14731), from 3.1 ks to 34.3 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 14737).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.52 (+/-0.07).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.32 (+0.18, -0.17). The best-fitting absorption column is 4.7 (+0.8, -0.7) x 10^21 cm^-2, in excess of the Galactic value of 5.3 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 3.8 x 10^-11 (8.5 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     4.7 (+0.8, -0.7) x 10^21 cm^-2
Galactic foreground: 5.3 x 10^20 cm^-2
Excess significance: 9.9 sigma
Photon index:	     2.32 (+0.18, -0.17)
```
If the light curve continues to decay with a power-law decay index of 0.52, the count rate at T+24 hours will be 0.028 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.1 x 10^-12 (2.4 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00557274.
This circular is an official product of the Swift-XRT team.
GCN Circular #14750
P. Kehusmaa, A. Oksanen and C. Harlingten report on behalf of the Searchlight Observatory Network:
On 2013 June 03, starting at 06:42 UT (T0+42.5 minutes), we observed the field of GRB130603A (Melandri et al., GCN Circ. 14731) with the 0.40 m NM1 telescope located in New Mexico, USA with Apogee Alta U42 CCD for 3x120 seconds using the V filter and 7x120 seconds unfiltered. The afterglow reported by Melandri et. al. (GCNC 14732) is detected in all unfiltered images and in the coadded V band image.
We report following differental photometry:
```
UTC (mid)            T0+(h)    Mag     Err   Filter
----------------------------------------------------------
2013-06-03T06:44:21  0.75      18.78   0.13  V 
2013-06-03T06:59:55  1.00      18.79   0.07  clear
----------------------------------------------------------
```
The reference magnitude from the nearby USNO B1.0 star (1729-0016610) with R=16.49.
A snapshot showing our coadded unfiltered image can be found at the URL http://pilvi.dyndns.org/arto/GRB130603A_C_840s.jpg
GCN Circular #14755
K. Ito, Y. Saito, Y. Yano, R. Usui, Y. Tachibana, T. Yoshii, S. Kurita, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 130603A (Melandri et al., GCNC 14731) with the optical three color (g, Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 2013-06-03 10:10:04 UT ( ~4.2 h after the burst). And we could not find any new point source within the XRT error circle (Beardmore et al., GCNC 14737) in all the three bands.
The results of photometry (3 sigma upper limits) are listed below. We used GSC2.3 catalog for flux calibration.
```
T0+[hour]     MID-UT   T-EXP[sec]             g'             Rc                Ic
--------------------------------------------------------------------------------------------
       4.175   12:30:14              9054      >19.4        >19.4        >18.7
--------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst [hour]
T-EXP: Total Exposure time [sec]
```
GCN Circular #14813
A. Volnova (IKI), R.Inasaridze (AAO), O. Kvaratskhelia (AAO), V. Ayvazian(AAO), Yu. Krugly (IA KhNU), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift Swift GRB 130603A (Melandri et al., GCN 14731) with AS-32 (0.7m) telescope of Abastumani Observatory on Jun. 03 and Jun. 04. We obtained several unfiltered images of 300 s and 180 s exposures. The afterglow (Melandri et al., GCN 14732) is well detected in combined images in both epochs. Preliminary photometry
```
Date        T_start    t-t0,      exp,    OT
             (UT)       mid, d     s
2013-06-03  22:19:06   0.69976    9x300   20.30 +/- 0.09
2013-06-04  20:28:49   1.62003   13x180   21.60 +/- 0.19
```
is based on SDSS stars R mag, where R mag obtained via transformations ugriz in BVRI (Lupton, 2005):
```
n SDSS                  R     errR
1 J054806.91+825053.0  17.648 0.015
2 J054805.54+825456.1  16.750 0.013
3 J054706.99+825234.5  15.573 0.012
```
GCN Report 441.1
GCN_Report 441.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_441_1.pdf by A. Melandri at INAF-OAB titled: "Swift Observations of GRB 130603A"

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Jochen Greiner, last update: 07-Jun-2013 [Disclaimer]