Gamma-ray Burst 060312

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 12 Mar 06 01:36:27 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     201391,   Seg_Num: 0
GRB_RA:           45.768d {+03h 03m 04s} (J2000),
                  45.853d {+03h 03m 25s} (current),
                  45.083d {+03h 00m 20s} (1950)
GRB_DEC:         +12.820d {+12d 49' 12"} (J2000),
                 +12.844d {+12d 50' 39"} (current),
                 +12.625d {+12d 37' 29"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4593 [cnts]    Image_Peak=215 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       28516 [cnts]
BKG_TIME:        5758.93 SOD {01:35:58.93} UT
BKG_DUR:         8 [sec]
GRB_DATE:        13806 TJD;    71 DOY;   06/03/12
GRB_TIME:        5772.75 SOD {01:36:12.75} UT
GRB_PHI:         -126.42 [deg]
GRB_THETA:         6.05 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.66 [sigma]
IMAGE_SIGNIF:    8.02 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +5  +0  +0 -56  +1 
SUN_POSTN:       352.04d {+23h 28m 10s}   -3.43d {-03d 26' 01"}
SUN_DIST:         55.85 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:      143.32d {+09h 33m 17s}  +18.45d {+18d 26' 55"}
MOON_DIST:        92.86 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      165.80,-38.86 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       47.00, -4.26 [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 = 243.52,-12.53 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 12 Mar 06 01:37:45 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     201391,   Seg_Num: 0
GRB_RA:           45.7758d {+03h 03m 06.1s} (J2000),
                  45.8608d {+03h 03m 26.5s} (current),
                  45.0904d {+03h 00m 21.7s} (1950)
GRB_DEC:         +12.8345d {+12d 50' 04.2"} (J2000),
                 +12.8585d {+12d 51' 30.6"} (current),
                 +12.6391d {+12d 38' 20.8"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       73 [cnts]
IMG_START_DATE:  13806 TJD;    71 DOY;   06/03/12
IMG_START_TIME:  5823.34 SOD {01:37:03.34} UT,   50.6 [sec] since BAT Trigger Time
CENTROID_X:      321.67,  raw= 322  [pixels]
CENTROID_Y:      274.25,  raw= 274  [pixels]
ROLL:            256.76 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -57.85
GRB_POS_XRT_Z:   48.03
IMAGE_URL:       sw00201391000msxps_rw.img
SUN_POSTN:       352.04d {+23h 28m 10s}   -3.43d {-03d 26' 00"}
SUN_DIST:         55.86 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:      143.33d {+09h 33m 20s}  +18.44d {+18d 26' 41"}
MOON_DIST:        92.86 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      165.79,-38.84 [deg] galactic lon,lat of the burst
ECL_COORDS:       47.01, -4.25 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 12 Mar 06 01:38:05 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     201391,   Seg_Num: 0
GRB_RA:           45.7758d {+03h 03m 06.1s} (J2000),
                  45.8608d {+03h 03m 26.5s} (current),
                  45.0904d {+03h 00m 21.7s} (1950)
GRB_DEC:         +12.8345d {+12d 50' 04.2"} (J2000),
                 +12.8585d {+12d 51' 30.6"} (current),
                 +12.6391d {+12d 38' 20.8"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       73 [cnts]
IMG_START_DATE:  13806 TJD;    71 DOY;   06/03/12
IMG_START_TIME:  5823.34 SOD {01:37:03.34} UT,   50.6 [sec] since BAT Trigger Time
CENTROID_X:      321.67,  raw= 322  [pixels]
CENTROID_Y:      274.25,  raw= 274  [pixels]
ROLL:            256.76 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -57.85
GRB_POS_XRT_Z:   48.03
IMAGE_URL:       sw00201391000msxps_rw.img
SUN_POSTN:       352.04d {+23h 28m 11s}   -3.43d {-03d 26' 00"}
SUN_DIST:         55.86 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:      143.34d {+09h 33m 21s}  +18.44d {+18d 26' 37"}
MOON_DIST:        92.86 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      165.79,-38.84 [deg] galactic lon,lat of the burst
ECL_COORDS:       47.01, -4.25 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 12 Mar 06 01:37:44 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     201391,   Seg_Num: 0
GRB_RA:           45.7758d {+03h 03m 06.1s} (J2000),
                  45.8608d {+03h 03m 26.5s} (current),
                  45.0904d {+03h 00m 21.7s} (1950)
GRB_DEC:         +12.8345d {+12d 50' 04.2"} (J2000),
                 +12.8585d {+12d 51' 30.6"} (current),
                 +12.6391d {+12d 38' 20.8"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.80e-09 [erg/cm2/sec]
GRB_SIGNIF:      8.54 [sigma]
IMG_START_DATE:  13806 TJD;    71 DOY;   06/03/12
IMG_START_TIME:  5823.34 SOD {01:37:03.34} UT,   50.6 [sec] since BAT Trigger Time
TAM[0-3]:        327.64 237.19 261.35 243.20
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       352.04d {+23h 28m 10s}   -3.43d {-03d 26' 00"}
SUN_DIST:         55.86 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:      143.33d {+09h 33m 20s}  +18.44d {+18d 26' 41"}
MOON_DIST:        92.86 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      165.79,-38.84 [deg] galactic lon,lat of the burst
ECL_COORDS:       47.01, -4.25 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 12 Mar 06 01:40:01 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     201391,   Seg_Num: 0
GRB_RA:           45.768d {+03h 03m 04s} (J2000),
                  45.853d {+03h 03m 25s} (current),
                  45.083d {+03h 00m 20s} (1950)
GRB_DEC:         +12.820d {+12d 49' 12"} (J2000),
                 +12.844d {+12d 50' 39"} (current),
                 +12.625d {+12d 37' 29"} (1950)
GRB_DATE:        13806 TJD;    71 DOY;   06/03/12
GRB_TIME:        5772.75 SOD {01:36:12.75} UT
TRIGGER_INDEX:   146
GRB_PHI:         -126.42 [deg]
GRB_THETA:         6.05 [deg]
DELTA_TIME:      58.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.66 [sigma]
IMAGE_SIGNIF:    8.02 [sigma]
LC_URL:          sw00201391000msb.lc
SUN_POSTN:       352.05d {+23h 28m 11s}   -3.43d {-03d 25' 58"}
SUN_DIST:         55.85 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:      143.35d {+09h 33m 24s}  +18.44d {+18d 26' 15"}
MOON_DIST:        92.89 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      165.80,-38.86 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       47.00, -4.26 [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 = 243.52,-12.53 [deg].

GCN Circular #4859
D. Grupe (PSU), S. Barthelmy (GSFC), D. Burrows (PSU), N. Gehrels (GSFC), S. Hunsberger (PSU), C. Pagani (PSU), D. Palmer (LANL) on behalf of the Swift team:
At 01:36:12 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060312 (trigger=201391). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 45.768, +12.820 {03h 03m 04s, +12d 49' 12"} (J2000) 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 30 sec. The peak count rate was 1300 counts/sec (15-350 keV), at ~6 sec after the trigger.
The XRT began observing the burst position at 01:37:03 UT (51 s after the BAT trigger). The XRT found a bright, uncataloged, fading source located at
```
RA(J2000) = 3h 03m 06.1s
Dec(J2000) = +12d 50' 04"
```
with an uncertainty of 5.0 arcseconds (90% confidence radius). This is 58 arcseconds from the BAT position. The initial flux was 1.8E-9 ergs/cm2/s.
The UVOT is currently in a state where it is unable to take data.
GCN Circular #4860
B. E. Schaefer (Louisiana State), F. Yuan (U Mich), S.A. Yost (U Mich), R. Quimby (U Texas), report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 060312 (Swift trigger 201391; D. Grupe et al. 2005, GCN 4859), producing images beginning 6.0 s after the GCN notice time. An automated response took the first image at 01:36:33.0 UT, 20.3 s after the burst trigger. We took 10 5-sec, 10 20-sec and 74 60-sec eposures; with ongoing imaging. The first 25 images were taken with moderate twilight and thin clouds, but after this there appears to be no problem with the sky conditions. These unfiltered images are calibrated relative to USNO A2.0 (R).
Comparison to the DSS (second epoch) reveals no new sources within the 3-sigma error circle, for both single images and coadding into sets of 10; the field is not crowded. In particular, we see no source at the location of the XRT fading transient (Grupe et al. 2005). Individual images have limiting magnitudes ranging from 14.4-17.5; we set the following specific limits.
```
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
01:36:33.0 01:36:38.0 5 14.6 20.3 N
01:47:39.9 01:52:22.2 282 17.1 687.2 Y
01:57:23.3 02:02:06.5 283 18.3 1270.6 Y
```
GCN Circular #4862
Subject: GRB 060312: Swift XRT team refined analysis
Dirk Grupe (PSU), David N. Burrows (PSU), Claudio Pagani (PSU), on behalf of the Swift XRT team:
We report on the analysis of the first three orbits of X-ray data of the Swift discovered GRB 060312. The XRT began observing the field of GRB 060312 01:36:12 UT, 51 seconds after the BAT trigger. The following refined position was obtained:
```
RA(J2000) =  03h 03m 06.12s
Dec(J2000)= =12d 50' 03.5"
```
with an estimated uncertainty of 3.7 arcsec (90% containment). This is 0.5 arcsec from the XRT position given in GCN 4859 (Grupe et al.), and 87 arcsec from the BAT position reported in the same circular.
The X-ray spectrum of the Windowed Timing (WT) data can be fitted by a single absorbed power low with a photon index Gamma=2.17+/-0.10 and an absorption column density NH=(2.3+/_0.3)e21 cm-2. This column density is above the Galactic value (1.4e21; Dickey & Lockman 1990) and suggests that the burst is intrinsically absorbed. The photon counting (pc) mode data are consistent with this result.
The light curve shows several flares in the first orbit. The underlying afterglow decay slope withing the first 10 ks after the burst is alpha=0.60+/-0.13. Assuming this decay slope the prediction for the flux 24 hours after the trigger is 4e-13 ergs/s/cm2.
This circular is an official product of the Swift-XRT team.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 12 Mar 06 16:17:23 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     201391,   Seg_Num: 0
POINT_RA:         45.761d {+03h 03m 03s} (J2000)
POINT_DEC:       +12.813d {+12d 48' 47"} (J2000)
POINT_ROLL:      256.774d
IMG_START_DATE:  13806 TJD;    71 DOY;   06/03/12
IMG_START_TIME:  57697.41 SOD {16:01:37.41} UT,   51924.7 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.802
N_STARS:         21
X_OFFSET:        414 [pixels]
Y_OFFSET:        734 [pixels]
X_MAX:           1373 [pixels]
Y_MAX:           1693 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00201391000msufc51924.fits
SUN_POSTN:       352.61d {+23h 30m 25s}   -3.19d {-03d 11' 35"}
SUN_DIST:         55.23 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      150.27d {+10h 01m 06s}  +15.57d {+15d 33' 58"}
MOON_DIST:       100.04 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      165.80,-38.87 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       46.99, -4.27 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 12 Mar 06 16:18:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     201391,   Seg_Num: 0
POINT_RA:         45.761d {+03h 03m 03s} (J2000)
POINT_DEC:       +12.813d {+12d 48' 47"} (J2000)
POINT_ROLL:      256.774d
IMG_START_DATE:  13806 TJD;    71 DOY;   06/03/12
IMG_START_TIME:  57697.41 SOD {16:01:37.41} UT,   51924.7 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.802
N_STARS:         21
X_OFFSET:        414 [pixels]
Y_OFFSET:        734 [pixels]
X_MAX:           1373 [pixels]
Y_MAX:           1693 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00201391000msufc51924.fits
SUN_POSTN:       352.61d {+23h 30m 25s}   -3.19d {-03d 11' 34"}
SUN_DIST:         55.23 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      150.28d {+10h 01m 08s}  +15.56d {+15d 33' 46"}
MOON_DIST:       100.05 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      165.80,-38.87 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       46.99, -4.27 [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:     Sun 12 Mar 06 16:18:55 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     201391,   Seg_Num: 0
POINT_RA:         45.761d {+03h 03m 03s} (J2000)
POINT_DEC:       +12.813d {+12d 48' 47"} (J2000)
ROLL:            256.774d
IMG_START_DATE:  13806 TJD;    71 DOY;   06/03/12
IMG_START_TIME:  57697.41 SOD {16:01:37.41} UT,   51924.7 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     163872098
X_OFFSET:        734 [pixels]
Y_OFFSET:        1054 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       894
Y_GRB_POS:       1214
BINNING_INDEX:   1
IM_URL:          sw00201391000msuni51924.fits
SUN_POSTN:       352.61d {+23h 30m 25s}   -3.19d {-03d 11' 33"}
SUN_DIST:         55.23 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      150.29d {+10h 01m 09s}  +15.56d {+15d 33' 39"}
MOON_DIST:       100.06 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      165.80,-38.87 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       46.99, -4.27 [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:     Sun 12 Mar 06 16:20:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     201391,   Seg_Num: 0
POINT_RA:         45.761d {+03h 03m 03s} (J2000)
POINT_DEC:       +12.813d {+12d 48' 47"} (J2000)
ROLL:            256.774d
IMG_START_DATE:  13806 TJD;    71 DOY;   06/03/12
IMG_START_TIME:  57697.41 SOD {16:01:37.41} UT,   51924.7 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     163872098
X_OFFSET:        734 [pixels]
Y_OFFSET:        1054 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       894
Y_GRB_POS:       1214
BINNING_INDEX:   1
IM_URL:          sw00201391000msuni51924.fits
SUN_POSTN:       352.61d {+23h 30m 26s}   -3.19d {-03d 11' 32"}
SUN_DIST:         55.23 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:      150.30d {+10h 01m 11s}  +15.56d {+15d 33' 25"}
MOON_DIST:       100.07 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      165.80,-38.87 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       46.99, -4.27 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #4864
H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Grupe (PSU), D. Hullinger (BYU-Idaho), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC) on behalf of the Swift-BAT team:
Using the data set from T-300 to T+302 sec from the recent telemetry downlink, we report further analysis of BAT GRB 060312 (trigger #201391) (Grupe, et al., GCN 4859). The BAT ground-calculated position is RA,Dec = 45.777,+12.825 deg {3h 3m 6.5s,+12d 49' 29.6"} (J2000) +- 0.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted lightcurve shows two main peaks at T-27 and T+7 sec. The first peak starts at T-35 sec and the second ends at ~T+30 sec. T90 (15-350 keV) is 43 +- 3 sec (estimated error including systematics).
The time-averaged spectrum from T-29.4 to T+22.0 is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.35 +- 0.34, and Epeak of 62.8 +- 21.5 keV (chi squared 46.33 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.8 +- 0.1 x 10^-06 erg/cm2 and the 1-sec peak flux measured from T+5.63 sec in the 15-150 keV band is 1.5 +- 0.1 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.85 +- 0.08 (chi squared 52.99 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
GCN Circular #4865
S. D. Hunsberger (PSU), D. Grupe (PSU), and F. Marshall (GSFC) on behalf of the Swift UVOT team:
The UVOT took a finding chart exposure of 200 seconds with the V filter starting 14.4 hours after the BAT trigger. No afterglow candidate has been found in the 2.7'x2.7' sub-image which covers 100% of the XRT error circle. The 3-sigma UL at the XRT position is 0.9 cps or 18.0 mag. No correction has been made for the expected extinction of about 0.6 magnitudes.

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Jochen Greiner, last update: 12-Mar-2006 [Disclaimer]