Gamma-ray Burst 130327A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Mar 13 01:57:54 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     552063,   Seg_Num: 0
GRB_RA:           91.992d {+06h 07m 58s} (J2000),
                  92.269d {+06h 09m 05s} (current),
                  90.943d {+06h 03m 46s} (1950)
GRB_DEC:         +55.730d {+55d 43' 49"} (J2000),
                 +55.728d {+55d 43' 40"} (current),
                 +55.738d {+55d 44' 15"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       7435 [cnts]    Image_Peak=228 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   253     E_range: 15-50 keV
BKG_INTEN:       77048 [cnts]
BKG_TIME:        6421.63 SOD {01:47:01.63} UT
BKG_DUR:         24 [sec]
GRB_DATE:        16378 TJD;    86 DOY;   13/03/27
GRB_TIME:        6454.01 SOD {01:47:34.01} UT
GRB_PHI:         -150.65 [deg]
GRB_THETA:        36.34 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     8.60 [sigma]
IMAGE_SIGNIF:    7.19 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +1  -3  +0  +0  -7  +0 
SUN_POSTN:         6.03d {+00h 24m 07s}   +2.61d {+02d 36' 26"}
SUN_DIST:         85.73 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      180.90d {+12h 03m 37s}   -4.40d {-04d 24' 13"}
MOON_DIST:        92.87 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      158.13, 16.40 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       91.33, 32.30 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
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 = 264.79,14.76 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Mar 13 01:58:21 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     552063,   Seg_Num: 0
POINT_RA:         92.014d {+06h 08m 03s} (J2000)
POINT_DEC:       +55.732d {+55d 43' 54"} (J2000)
IMG_START_DATE:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  6553.35 SOD {01:49:13.35} UT,   99.3 [sec] since BAT Trigger Time
COUNTS:          17    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:     Wed 27 Mar 13 01:59:02 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     552063,   Seg_Num: 0
GRB_RA:           91.992d {+06h 07m 58s} (J2000),
                  92.269d {+06h 09m 05s} (current),
                  90.943d {+06h 03m 46s} (1950)
GRB_DEC:         +55.730d {+55d 43' 49"} (J2000),
                 +55.728d {+55d 43' 40"} (current),
                 +55.738d {+55d 44' 15"} (1950)
GRB_DATE:        16378 TJD;    86 DOY;   13/03/27
GRB_TIME:        6454.01 SOD {01:47:34.01} UT
TRIGGER_INDEX:   253
GRB_PHI:         -150.65 [deg]
GRB_THETA:        36.34 [deg]
DELTA_TIME:      -37.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     8.60 [sigma]
IMAGE_SIGNIF:    7.19 [sigma]
LC_URL:          sw00552063000msb.lc
SUN_POSTN:         6.03d {+00h 24m 08s}   +2.61d {+02d 36' 27"}
SUN_DIST:         85.73 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      180.91d {+12h 03m 39s}   -4.41d {-04d 24' 27"}
MOON_DIST:        92.88 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      158.13, 16.40 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       91.33, 32.30 [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 = 264.79,14.76 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Mar 13 01:59:34 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     552063,   Seg_Num: 0
POINT_RA:         92.015d {+06h 08m 04s} (J2000)
POINT_DEC:       +55.732d {+55d 43' 54"} (J2000)
POINT_ROLL:      268.151d
IMG_START_DATE:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  6558.02 SOD {01:49:18.02} UT,   104.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.491
N_STARS:         92
X_OFFSET:        556 [pixels]
Y_OFFSET:        480 [pixels]
X_MAX:           1515 [pixels]
Y_MAX:           1439 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00552063000msufc0104.fits
SUN_POSTN:         6.03d {+00h 24m 08s}   +2.61d {+02d 36' 28"}
SUN_DIST:         85.74 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      180.92d {+12h 03m 40s}   -4.41d {-04d 24' 33"}
MOON_DIST:        92.87 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      158.14, 16.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       91.34, 32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Mar 13 02:00:04 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     552063,   Seg_Num: 0
POINT_RA:         92.015d {+06h 08m 04s} (J2000)
POINT_DEC:       +55.732d {+55d 43' 54"} (J2000)
POINT_ROLL:      268.151d
IMG_START_DATE:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  6558.02 SOD {01:49:18.02} UT,   104.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.491
N_STARS:         92
X_OFFSET:        556 [pixels]
Y_OFFSET:        480 [pixels]
X_MAX:           1515 [pixels]
Y_MAX:           1439 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00552063000msufc0104.fits
SUN_POSTN:         6.03d {+00h 24m 08s}   +2.61d {+02d 36' 28"}
SUN_DIST:         85.74 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      180.92d {+12h 03m 41s}   -4.41d {-04d 24' 39"}
MOON_DIST:        92.87 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      158.14, 16.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       91.34, 32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Mar 13 02:01:04 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     552063,   Seg_Num: 0
POINT_RA:         92.015d {+06h 08m 04s} (J2000)
POINT_DEC:       +55.732d {+55d 43' 54"} (J2000)
ROLL:            268.151d
IMG_START_DATE:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  6558.02 SOD {01:49:18.02} UT,   104.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     386041768
X_OFFSET:        875 [pixels]
Y_OFFSET:        799 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1035
Y_GRB_POS:       959
BINNING_INDEX:   1
IM_URL:          sw00552063000msuni0115.fits
SUN_POSTN:         6.03d {+00h 24m 08s}   +2.61d {+02d 36' 29"}
SUN_DIST:         85.74 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      180.93d {+12h 03m 43s}   -4.41d {-04d 24' 50"}
MOON_DIST:        92.88 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      158.14, 16.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       91.34, 32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Mar 13 02:01:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     552063,   Seg_Num: 0
POINT_RA:         92.015d {+06h 08m 04s} (J2000)
POINT_DEC:       +55.732d {+55d 43' 54"} (J2000)
ROLL:            268.151d
IMG_START_DATE:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  6558.02 SOD {01:49:18.02} UT,   104.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     386041768
X_OFFSET:        875 [pixels]
Y_OFFSET:        799 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1035
Y_GRB_POS:       959
BINNING_INDEX:   1
IM_URL:          sw00552063000msuni0115.fits
SUN_POSTN:         6.03d {+00h 24m 08s}   +2.61d {+02d 36' 30"}
SUN_DIST:         85.74 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      180.93d {+12h 03m 44s}   -4.42d {-04d 24' 55"}
MOON_DIST:        92.88 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      158.14, 16.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       91.34, 32.30 [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:     Wed 27 Mar 13 02:02:46 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     552063,   Seg_Num: 0
GRB_RA:           92.0401d {+06h 08m 09.62s} (J2000),
                  92.3176d {+06h 09m 16.23s} (current),
                  90.9913d {+06h 03m 57.91s} (1950)
GRB_DEC:         +55.7148d {+55d 42' 53.2"} (J2000),
                 +55.7120d {+55d 42' 43.1"} (current),
                 +55.7222d {+55d 43' 19.7"} (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:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  6595.00 SOD {01:49:55.00} UT,   141.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:         6.03d {+00h 24m 08s}   +2.61d {+02d 36' 31"}
SUN_DIST:         85.75 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      180.95d {+12h 03m 47s}   -4.42d {-04d 25' 10"}
MOON_DIST:        92.88 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      158.16, 16.42 [deg] galactic lon,lat of the burst
ECL_COORDS:       91.36, 32.29 [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:     Wed 27 Mar 13 02:04:42 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     552063,   Seg_Num: 0
POINT_RA:         92.017d {+06h 08m 04s} (J2000)
POINT_DEC:       +55.735d {+55d 44' 05"} (J2000)
POINT_ROLL:      268.154d
IMG_START_DATE:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  6770.86 SOD {01:52:50.86} UT,   316.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.705
N_STARS:         167
X_OFFSET:        316 [pixels]
Y_OFFSET:        240 [pixels]
X_MAX:           1755 [pixels]
Y_MAX:           1679 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00552063000msufc0316.fits
SUN_POSTN:         6.03d {+00h 24m 08s}   +2.61d {+02d 36' 33"}
SUN_DIST:         85.74 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      180.96d {+12h 03m 51s}   -4.43d {-04d 25' 33"}
MOON_DIST:        92.91 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      158.13, 16.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       91.34, 32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Mar 13 02:04:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     552063,   Seg_Num: 0
POINT_RA:         92.017d {+06h 08m 04s} (J2000)
POINT_DEC:       +55.735d {+55d 44' 05"} (J2000)
POINT_ROLL:      268.154d
IMG_START_DATE:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  6770.86 SOD {01:52:50.86} UT,   316.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.705
N_STARS:         167
X_OFFSET:        316 [pixels]
Y_OFFSET:        240 [pixels]
X_MAX:           1755 [pixels]
Y_MAX:           1679 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00552063000msufc0316.fits
SUN_POSTN:         6.03d {+00h 24m 08s}   +2.61d {+02d 36' 33"}
SUN_DIST:         85.74 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      180.97d {+12h 03m 52s}   -4.43d {-04d 25' 35"}
MOON_DIST:        92.91 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      158.13, 16.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       91.34, 32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Mar 13 02:05:49 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     552063,   Seg_Num: 0
GRB_RA:           92.0387d {+06h 08m 09.28s} (J2000),
                  92.3162d {+06h 09m 15.89s} (current),
                  90.9899d {+06h 03m 57.58s} (1950)
GRB_DEC:         +55.7143d {+55d 42' 51.4"} (J2000),
                 +55.7115d {+55d 42' 41.4"} (current),
                 +55.7217d {+55d 43' 17.9"} (1950)
GRB_ERROR:       2.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  6595.00 SOD {01:49:55.00} UT,   141.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:         6.04d {+00h 24m 09s}   +2.61d {+02d 36' 34"}
SUN_DIST:         85.75 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      180.97d {+12h 03m 54s}   -4.43d {-04d 25' 46"}
MOON_DIST:        92.90 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      158.16, 16.42 [deg] galactic lon,lat of the burst
ECL_COORDS:       91.36, 32.28 [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:     Wed 27 Mar 13 02:07:07 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     552063,   Seg_Num: 0
POINT_RA:          0.000d {+00h 00m 00s} (J2000)
POINT_DEC:        +0.000d {+00d 00' 00"} (J2000)
ROLL:            55.735d
IMG_START_DATE:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  7270.39 SOD {02:01:10.39} UT,   816.4 [sec] since BAT Trigger Time
FILTER:          0, illegal value
EXPOSURE_ID:     65537
X_OFFSET:        911 [pixels]
Y_OFFSET:        1277 [pixels]
WIDTH:           386 [pixels]
HEIGHT:          1063 [pixels]
X_GRB_POS:       0
Y_GRB_POS:       0
BINNING_INDEX:   0
IM_URL:          sw00552063000msuni0327.fits
SUN_POSTN:         6.04d {+00h 24m 09s}   +2.61d {+02d 36' 35"}
SUN_DIST:          6.39 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:      180.99d {+12h 03m 57s}   -4.43d {-04d 26' 02"}
MOON_DIST:       175.56 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       96.34,-60.19 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        0.00,  0.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        WARNING: This Notice was received with 1 (or more) critical values out of range.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 1x1 binning (ie no compression).  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Mar 13 02:07:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     552063,   Seg_Num: 0
POINT_RA:          0.000d {+00h 00m 00s} (J2000)
POINT_DEC:        +0.000d {+00d 00' 00"} (J2000)
ROLL:            55.735d
IMG_START_DATE:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  7270.39 SOD {02:01:10.39} UT,   816.4 [sec] since BAT Trigger Time
FILTER:          0, illegal value
EXPOSURE_ID:     65537
X_OFFSET:        911 [pixels]
Y_OFFSET:        1277 [pixels]
WIDTH:           386 [pixels]
HEIGHT:          1063 [pixels]
X_GRB_POS:       0
Y_GRB_POS:       0
BINNING_INDEX:   0
IM_URL:          sw00552063000msuni0327.fits
SUN_POSTN:         6.04d {+00h 24m 09s}   +2.61d {+02d 36' 35"}
SUN_DIST:          6.39 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:      180.99d {+12h 03m 57s}   -4.44d {-04d 26' 05"}
MOON_DIST:       175.56 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       96.34,-60.19 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        0.00,  0.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        WARNING: This Notice was received with 1 (or more) critical values out of range.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 1x1 binning (ie no compression).  
COMMENTS:        All 4 attachments are included.  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Mar 13 02:08:42 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     552063,   Seg_Num: 0
POINT_RA:         92.017d {+06h 08m 04s} (J2000)
POINT_DEC:       +55.735d {+55d 44' 05"} (J2000)
POINT_ROLL:      268.155d
IMG_START_DATE:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  7326.16 SOD {02:02:06.16} UT,   872.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.464
N_STARS:         190
X_OFFSET:        316 [pixels]
Y_OFFSET:        240 [pixels]
X_MAX:           1755 [pixels]
Y_MAX:           1679 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00552063000msufc0872.fits
SUN_POSTN:         6.04d {+00h 24m 09s}   +2.61d {+02d 36' 37"}
SUN_DIST:         85.74 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      181.00d {+12h 04m 00s}   -4.44d {-04d 26' 20"}
MOON_DIST:        92.94 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      158.13, 16.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       91.34, 32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Mar 13 02:09:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     552063,   Seg_Num: 0
POINT_RA:         92.017d {+06h 08m 04s} (J2000)
POINT_DEC:       +55.735d {+55d 44' 05"} (J2000)
POINT_ROLL:      268.155d
IMG_START_DATE:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  7326.16 SOD {02:02:06.16} UT,   872.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.464
N_STARS:         190
X_OFFSET:        316 [pixels]
Y_OFFSET:        240 [pixels]
X_MAX:           1755 [pixels]
Y_MAX:           1679 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00552063000msufc0872.fits
SUN_POSTN:         6.04d {+00h 24m 09s}   +2.61d {+02d 36' 37"}
SUN_DIST:         85.74 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      181.00d {+12h 04m 01s}   -4.44d {-04d 26' 25"}
MOON_DIST:        92.94 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      158.13, 16.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       91.34, 32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Mar 13 02:10:15 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     552063,   Seg_Num: 0
POINT_RA:         92.017d {+06h 08m 04s} (J2000)
POINT_DEC:       +55.735d {+55d 44' 05"} (J2000)
ROLL:            268.155d
IMG_START_DATE:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  7326.16 SOD {02:02:06.16} UT,   872.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     386042536
X_OFFSET:        875 [pixels]
Y_OFFSET:        799 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1035
Y_GRB_POS:       959
BINNING_INDEX:   1
IM_URL:          sw00552063000msuni0883.fits
SUN_POSTN:         6.04d {+00h 24m 09s}   +2.61d {+02d 36' 38"}
SUN_DIST:         85.74 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      181.01d {+12h 04m 03s}   -4.44d {-04d 26' 38"}
MOON_DIST:        92.95 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      158.13, 16.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       91.34, 32.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Mar 13 02:10:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     552063,   Seg_Num: 0
POINT_RA:         92.017d {+06h 08m 04s} (J2000)
POINT_DEC:       +55.735d {+55d 44' 05"} (J2000)
ROLL:            268.155d
IMG_START_DATE:  16378 TJD;    86 DOY;   13/03/27
IMG_START_TIME:  7326.16 SOD {02:02:06.16} UT,   872.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     386042536
X_OFFSET:        875 [pixels]
Y_OFFSET:        799 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1035
Y_GRB_POS:       959
BINNING_INDEX:   1
IM_URL:          sw00552063000msuni0883.fits
SUN_POSTN:         6.04d {+00h 24m 09s}   +2.61d {+02d 36' 39"}
SUN_DIST:         85.74 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      181.02d {+12h 04m 04s}   -4.45d {-04d 26' 42"}
MOON_DIST:        92.95 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      158.13, 16.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       91.34, 32.30 [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 #14331
T. N. Ukwatta (MSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), V. Mangano (INAF-IASFPA), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), A. Maselli (INAF-IASFPA), D. M. Palmer (LANL), M. H. Siegel (PSU) and C. A. Swenson (PSU) report on behalf of the Swift Team:
At 01:47:34 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130327A (trigger=552063). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 91.992, +55.730 which is
```
   RA(J2000)  =  06h 07m 58s
   Dec(J2000) = +55d 43' 49"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a weak single peak with a duration of about 10 sec. The peak count rate was ~900 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 01:49:55.0 UT, 141.0 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 92.0387, 55.7143 which is equivalent to:
```
   RA(J2000)  = 06h 08m 09.29s
   Dec(J2000) = +55d 42' 51.5"
```
with an uncertainty of 2.7 arcseconds (radius, 90% containment). This location is 110 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. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.31 x 10^21 cm^-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 104 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 none 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 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.13.
Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.com). 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 #14333
A. N. Morgan (UC Berkeley) reports:
We observed the field of GRB 130327A (Ukwatta et al., GCN 14331) with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at 2013-Mar-27 02h21m22s UT, ~33.8 minutes after the Swift trigger. In mosaics (effective exposure time of ~25 m) taken simultaneously in the J, H, and Ks filters, we marginally detect a source in the J band within the XRT error circle (Ukwatta et al., GCN 14331). Given the minor significance of the detection in only a single filter, deeper observations are encouraged to confirm if this possible source is indeed the afterglow of GRB 130327A.
```
post burst
t_mid (hr) exp.(hr) filt  Mag
0.91       0.42     J     17.8 +/- 0.4
0.91       0.42     H     > 17.1
0.91       0.42     Ks    > 15.7
```
All magnitudes are given in the Vega system, calibrated to 2MASS. No correction for Galactic extinction has been made to the above reported values. Observations are ongoing.
GCN Circular #14334
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB) J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UCSC), Eleonora Troja (GSFC), Enrico Ramirez-Ruiz (UCSC), Jos=E9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report:
We observed the field of GRB 130327A (Ukwatta, et al., GCN 14331) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro M=E1rtir from 2013/03 27.12 to 2013/03 27.17 UTC (1.16 to 2.17 hours after the BAT trigger), obtaining a total of 0.82 hours exposures in the r' and i' bands and 0.35 hours of exposure in the Z, Y, J, and H bands.
We detect one uncatalogued source within the XRT error region (GCN 14331), at a position RA , DEC: =3D 92.03875, 55.71504 (+/-0.5 ", J2000). This is 2.7" from the center of the XRT error circle. In comparison with USNO-B1 and 2MASS, we derive the following detections and upper limit (3-sigma) in the AB magnitude system:
```
r'    21.22 +/- 0.10
i'    21.17 +/- 0.09
Z    20.09 +/- 0.14
Y    19.98 +/- 0.17
J    19.98 +/- 0.23
H     > 20.08
```
We also detect a second uncatalogued source just outside the XRT error circle (3.9" from the center) at RA , DEC: 92.03822, 55.71326 (+/-0.5 ", J2000):
```
r'    21.61 +/- 0.14
i'    20.36 +/- 0.05
Z    19.15 +/- 0.06
Y    18.72 +/- 0.06
J    18.70 +/- 0.07
H    18.53 +/- 0.09
```
We note that this second source has a brightness consistent with the earlier PAIRITEL measurement (Morgan; GCN 14333).
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir. Further observations are planned.
GCN Circular #14335
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 1239 s of XRT Photon Counting mode data and 2 UVOT images for GRB 130327A, 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 = 92.03858, +55.71475 which is equivalent to:
```
RA (J2000): 06h 08m 9.26s
Dec (J2000): +55d 42' 53.1"
```
with an uncertainty of 1.9 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 #14337
L. Elenin (KIAM), A. Volnova (SAI MSU), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 130327A (Ukwatta, et al., GCN 14331) with 0.45-m telescope of ISON-NM observatory on Mar. 27, between (UT) 02:44:04 - 03:27:54. We took several unfiltered images of 30 s exposures. Within enhanced XRT afterglow position (Osborne et al., GCN 14335) we do not detect any new object. We marginally (S/N~2.5, R~ 20.3) detected "second uncatalogued source" (Morgan et al., GCN 14333; Butler et al., GCN 14334) at RA , DEC (J2000): 06 08 09.06 +55 42 48.5. A photometry of combined image is based on the USNO-B1.0 (R2) nearby stars

  Start,   T0+,          Exposure,  OT,    UL (3 sigma)
  (UT)     mid, d         (s)

02:44:04  0.0546        60x30      n/d    20.0

 GCN Circular #14339 


C. A. Swenson (PSU) and T. N. Ukwatta (MSU)
report on behalf of the Swift/UVOT team:


The Swift/UVOT began settled observations of the field of GRB 130327A
104 s after the BAT trigger (Ukwatta et al., GCN Circ. 14331).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 14335)
is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           104          254          147         >21.2
u_FC               317          567          246         >20.0
white              104         6491          727         >21.8
v                  646         6877          428         >19.8
b                  572         6286          432         >20.7
u                  317         6081          659         >20.4
w1                 695        12014         1111         >21.6
m2                 671        11107         1141         >21.0
w2                 622         6696          452         >21.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.13 in the direction of the burst
(Schlegel et al. 1998).

 GCN Circular #14340 


D. Xu (DARK/NBI), C. Cao, S. M. Hu (SDU) report:


We observed the field of GRB 130327A (Ukwatta et al., GCN 14331) using
the 1m telescope located in Weihai, Shandong Province, China.
Observations started at 11:27:02 UT on 2013-03-27 (i.e, 9.658 hr after
the burst) in a seeing of ~2.8", and 10x360s I-band images were
obtained with a mean time of 10.158 hr post-burst.


Within the enhanced XRT error circle (Osborne et al., GCN 14335), no
credible source is detected in the stacked I-band image, down to a
limit of R>20.2 mag, calibrated with the USNO B1 catalogue.


A source, with R~19.2 mag and somehow extended along NW-SE, is
detected at the position of the "second uncatalogued source" reported
by Butler et al. (GCN 14334), and confirmed in Elenin et al. (GCN
14337). This source might be the one in Morgan (GCN 14333). Since it
is 5.5" away from the center of the enhanced XRT error circle (radius:
1.9") and it's getting brightening significantly, this source is
unlikely related to the afterglow of the burst.


We thank Dayong Ren for carrying out thee observations.

 GCN Circular #14341 


C. Pagani (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A.
Maselli  (INAF-IASFPA), D.N. Burrows (PSU), J.A. Kennea (PSU), M.C.
Stroh (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester)
and T.N. Ukwatta report on behalf of the Swift-XRT team:


We have analysed 10 ks of XRT data for GRB 130327A (Ukwatta  et al. GCN
Circ. 14331),  from 83 s to 45.1 ks after the  BAT trigger. The data
comprise 902 s in Windowed Timing (WT) mode (the first 9 s were taken
while Swift was slewing) with the remainder in Photon Counting (PC)
mode. The enhanced XRT position for this burst was given by Osborne et
al. (GCN. Circ 14335).


The light curve can be modelled with an initial power-law decay with an
index of alpha=4.3 (+0.5, -0.4), followed by a break at T+348 s to an
alpha of 0.22 (+0.07, -0.08).


A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.28 (+0.29, -0.13). The
best-fitting absorption column is  consistent with the Galactic value
of 1.3 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 3.2 x 10^-11 (4.1 x 10^-11) erg cm^-2 count^-1. 


A summary of the PC-mode spectrum is thus:
Total column:	     0 (+3.7, -0) x 10^20 cm^-2
Galactic foreground: 1.3 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     2.28 (+0.29, -0.13)

If the light curve continues to decay with a power-law decay index of
0.22, the count rate at T+24 hours will be 0.012 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.7 x
10^-13 (4.8 x 10^-13) erg cm^-2 s^-1.


The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00552063.


This circular is an official product of the Swift-XRT team.

 GCN Circular #14342 


A. Cucchiara (UCSC/UCO Lick Observatory) and S. B. Cenko 
(UC Berkeley) report on behalf of a large collaboration:


"On March 27.25 UT we observed the field of GRB 130327A 
(Ukwatta et al., GCN 14331) with the Gemini-North telescope
equipped with the GMOS camera.


We obtained a 4 minutes i' band image of the field:
the two sources identified by Butler et al. (GCN 14334)
are both detected.


The southern source (#1) is located at
RA: 06:08:09.12 (J2000)
Dec: +55:42:47.98 (J2000)

The northern source (#2) is located inside the XRT revised 
error circle (Osborne et al. GCN 14335) at:
RA: 06:08:09.25 (J2000)
Dec: +55:42:54.39  (J2000)

Using several nearby USNO-B1 stars we estimated i' = 19.81 
+- 0.02, (source #1), and i' = 21.75 +- 0.06 (source #2), 
which is 0.43 mag fainter than the RATIR observations. 


We also obtained a 2x900s spectra of these two sources under cloudy
conditions, covering the 6000-10000A wavelength range: source #1
presents several stellar features, while source #2 presents a noisy 
continuum, but no clear absorption features are identified.


If we assume that source #2 is indeed GRB 130327A afterglow, we can
place an upper limit on the GRB redshift of z < 3.9, based on the 
absence of a Lyman-break features. 
Our acquisition image can be found here:
https://www.dropbox.com/s/ygvcdykmpow6gq5/sources.jpeg


We thank the Gemini staff for performing this observations,
in particular Andre'-Nicolas Chene' "
 




 GCN Circular #14343 


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), D. M. Palmer (LANL),
A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS),
M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU)
(i.e. the Swift-BAT team):


Using the data set from T-239 to T+963 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 130327A (trigger #552063)
(Ukwatta, et al., GCN Circ. 14140).  The BAT ground-calculated position is
RA, Dec = 91.984, 55.732 deg, which is 
   RA(J2000)  =  06h 07m 56.2s 
   Dec(J2000) = +55d 43' 56.2" 

with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 61%.


The mask-weighted lightcurve shows a single peak starting at ~T-5 sec,
peaking at ~T+1 sec, and ending at ~T+8 sec.  T90 (15-350 keV) is
9.0 +- 2.8 sec (estimated error including systematics).


The time-averaged spectrum from T-4.38 to T+5.62 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
2.26 +- 0.36.  The fluence in the 15-150 keV band is 2.3 +- 0.5 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.62 sec in the 15-150 keV band
is 0.9 +- 0.2 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/552063/BA/

 GCN Circular #14352 


Antonino Cucchiara (UCSC), Nat Butler (ASU), Alan M. Watson (UNAM),=20
Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM),=20
Chris Klein (UCB), Ori Fox (UCB) J. Xavier Prochaska (UCSC), Josh Bloom=20
(UCB), Eleonora Troja (GSFC), Enrico Ramirez-Ruiz (UCSC), Jos=E9 A. de Di=
ego=20
(UNAM), Leonid Georgiev (UNAM), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n=
-Z=FA=F1iga=20
(UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report:


We reobserved the field of GRB 130327A (Ukwatta et al., GCN 14331,0
and Osborne et al., GCN 14335) with the Reionization and Transients0
Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson
Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro
M=E1rtir from 2013/03 28.13 to 2013/03 28.14 UTC (25.24 to 25.64 hours
after the BAT trigger), obtaining a total of 0.33 hours exposure in the
r' and i' bands and 0.14 hours of exposure in the Z, Y, J, and H bands.


The source identified in our previous RATIR observations within the refined 
XRT
error circle (Butler et al. GCN 14334), and detected by Gemini (source #2
in GCN  14342) has faded below our detection limit. We report the following
3-sigma limits in the AB magnitude system:
 r'	> 22.67
 i'	> 22.46
 Z	> 20.83
 Y	> 20.47
 J	> 20.07
 H	> 19.99

This fading is consistent with the fading reported by Cucchiara et al.
(GCN 14342). Based on these observations we confirm that this was the
optical/NIR afterglow of GRB 130327A.


The second source identified outside the refined XRT error circle in the
first RATIR observation and detected also by Gemini (as source #1 in GCN 14342)
has not faded. Therefore it is unrelated to GRB 130327A.


These magnitudes are not corrected for Galactic extinction in the direction
of the GRB.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro
M=E1rtir.

 GCN Report 428.1 

GCN_Report 428.1 has been posted:
http://gcn.gsfc.nasa.gov/reports/report_428_1.pdf 
by T.N. Ukwatta
at MSU
titled: "Swift Observations of INTEGRAL GRB 130327A"

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Jochen Greiner, last update: 27-Mar-2013 [Disclaimer]