Gamma-ray Burst 060322

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Mar 06 23:00:36 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     202442,   Seg_Num: 0
GRB_RA:          274.245d {+18h 16m 59s} (J2000),
                 274.350d {+18h 17m 24s} (current),
                 273.397d {+18h 13m 35s} (1950)
GRB_DEC:         -36.697d {-36d 41' 50"} (J2000),
                 -36.695d {-36d 41' 40"} (current),
                 -36.716d {-36d 42' 56"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4240 [cnts]    Image_Peak=158 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   155     E_range: 50-350 keV
BKG_INTEN:       26932 [cnts]
BKG_TIME:        82806.91 SOD {23:00:06.91} UT
BKG_DUR:         8 [sec]
GRB_DATE:        13816 TJD;    81 DOY;   06/03/22
GRB_TIME:        82821.12 SOD {23:00:21.12} UT
GRB_PHI:         -15.25 [deg]
GRB_THETA:        30.59 [deg]
SOLN_STATUS:     0x83
RATE_SIGNIF:     12.64 [sigma]
IMAGE_SIGNIF:    6.93 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3  +2  -5  +1  -2  +1 
SUN_POSTN:         2.00d {+00h 08m 00s}   +0.87d {+00d 52' 00"}
SUN_DIST:         88.63 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      274.68d {+18h 18m 42s}  -28.69d {-28d 41' 12"}
MOON_DIST:         8.01 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      356.43, -9.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      273.50,-13.31 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 147.99,-20.50 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Mar 06 23:03:49 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     202442,   Seg_Num: 0
GRB_RA:          274.245d {+18h 16m 59s} (J2000),
                 274.350d {+18h 17m 24s} (current),
                 273.397d {+18h 13m 35s} (1950)
GRB_DEC:         -36.697d {-36d 41' 50"} (J2000),
                 -36.695d {-36d 41' 40"} (current),
                 -36.716d {-36d 42' 56"} (1950)
GRB_DATE:        13816 TJD;    81 DOY;   06/03/22
GRB_TIME:        82821.12 SOD {23:00:21.12} UT
TRIGGER_INDEX:   155
GRB_PHI:         -15.25 [deg]
GRB_THETA:        30.59 [deg]
DELTA_TIME:      19.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     12.64 [sigma]
IMAGE_SIGNIF:    6.93 [sigma]
LC_URL:          sw00202442000msb.lc
SUN_POSTN:         2.00d {+00h 08m 01s}   +0.87d {+00d 52' 04"}
SUN_DIST:         88.64 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      274.71d {+18h 18m 51s}  -28.69d {-28d 41' 08"}
MOON_DIST:         8.01 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      356.43, -9.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      273.50,-13.31 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 147.99,-20.50 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Mar 06 23:03:54 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     202442,   Seg_Num: 0
GRB_RA:          274.245d {+18h 16m 59s} (J2000),
                 274.350d {+18h 17m 24s} (current),
                 273.397d {+18h 13m 35s} (1950)
GRB_DEC:         -36.697d {-36d 41' 50"} (J2000),
                 -36.695d {-36d 41' 40"} (current),
                 -36.716d {-36d 42' 56"} (1950)
GRB_DATE:        13816 TJD;    81 DOY;   06/03/22
GRB_TIME:        82821.12 SOD {23:00:21.12} UT
TRIGGER_INDEX:   155
GRB_PHI:         -15.25 [deg]
GRB_THETA:        30.59 [deg]
DELTA_TIME:      19.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     12.64 [sigma]
IMAGE_SIGNIF:    6.93 [sigma]
LC_URL:          sw00202442000msb.lc
SUN_POSTN:         2.00d {+00h 08m 01s}   +0.87d {+00d 52' 04"}
SUN_DIST:         88.64 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      274.71d {+18h 18m 51s}  -28.69d {-28d 41' 08"}
MOON_DIST:         8.01 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      356.43, -9.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      273.50,-13.31 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 147.99,-20.50 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Mar 06 23:09:39 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     202442,   Seg_Num: 0
GRB_RA:          274.245d {+18h 16m 59s} (J2000),
                 274.350d {+18h 17m 24s} (current),
                 273.397d {+18h 13m 35s} (1950)
GRB_DEC:         -36.697d {-36d 41' 50"} (J2000),
                 -36.695d {-36d 41' 40"} (current),
                 -36.716d {-36d 42' 56"} (1950)
GRB_DATE:        13816 TJD;    81 DOY;   06/03/22
GRB_TIME:        82821.12 SOD {23:00:21.12} UT
TRIGGER_INDEX:   155
GRB_PHI:         -15.25 [deg]
GRB_THETA:        30.59 [deg]
DELTA_TIME:      19.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     12.64 [sigma]
IMAGE_SIGNIF:    6.93 [sigma]
LC_URL:          sw00202442000msb.lc
SUN_POSTN:         2.01d {+00h 08m 01s}   +0.87d {+00d 52' 09"}
SUN_DIST:         88.64 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      274.77d {+18h 19m 06s}  -28.68d {-28d 41' 01"}
MOON_DIST:         8.02 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      356.43, -9.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      273.50,-13.31 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 147.99,-20.50 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Mar 06 23:13:00 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     202442,   Seg_Num: 0
GRB_RA:          274.245d {+18h 16m 59s} (J2000),
                 274.350d {+18h 17m 24s} (current),
                 273.397d {+18h 13m 35s} (1950)
GRB_DEC:         -36.697d {-36d 41' 50"} (J2000),
                 -36.695d {-36d 41' 40"} (current),
                 -36.716d {-36d 42' 56"} (1950)
GRB_DATE:        13816 TJD;    81 DOY;   06/03/22
GRB_TIME:        82821.12 SOD {23:00:21.12} UT
TRIGGER_INDEX:   155
GRB_PHI:         -15.25 [deg]
GRB_THETA:        30.59 [deg]
DELTA_TIME:      19.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     12.64 [sigma]
IMAGE_SIGNIF:    6.93 [sigma]
LC_URL:          sw00202442000msb.lc
SUN_POSTN:         2.01d {+00h 08m 02s}   +0.87d {+00d 52' 13"}
SUN_DIST:         88.64 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      274.81d {+18h 19m 14s}  -28.68d {-28d 40' 57"}
MOON_DIST:         8.02 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      356.43, -9.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      273.50,-13.31 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 147.99,-20.50 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 22 Mar 06 23:16:59 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     202442,   Seg_Num: 0
GRB_RA:          274.245d {+18h 16m 59s} (J2000),
                 274.350d {+18h 17m 24s} (current),
                 273.397d {+18h 13m 35s} (1950)
GRB_DEC:         -36.697d {-36d 41' 50"} (J2000),
                 -36.695d {-36d 41' 40"} (current),
                 -36.716d {-36d 42' 56"} (1950)
GRB_DATE:        13816 TJD;    81 DOY;   06/03/22
GRB_TIME:        82821.12 SOD {23:00:21.12} UT
TRIGGER_INDEX:   155
GRB_PHI:         -15.25 [deg]
GRB_THETA:        30.59 [deg]
DELTA_TIME:      19.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     12.64 [sigma]
IMAGE_SIGNIF:    6.93 [sigma]
LC_URL:          sw00202442000msb.lc
SUN_POSTN:         2.01d {+00h 08m 03s}   +0.87d {+00d 52' 17"}
SUN_DIST:         88.65 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      274.85d {+18h 19m 25s}  -28.68d {-28d 40' 52"}
MOON_DIST:         8.02 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      356.43, -9.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      273.50,-13.31 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 147.99,-20.50 [deg].

GCN Circular #4903
M. Perri (ASDC), S.D. Barthelmy (GSFC), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), C.B. Markwardt (GSFC/UMD), D. M. Palmer (LANL) and L. Vetere (ASDC) report on behalf of the Swift Team:
At 23:00:21 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060322 (trigger=202442). Swift did not slew to this burst because the location is within the Moon observing constraint (8 deg). The BAT on-board calculated location is RA,Dec 274.245, -36.697 {18h 16m 59s, -36d 41' 50"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a double episode of multi-peak structures. The first episode starts at T-10 sec and lasts to T+35 sec. The second episode starts at T+155 sec and lasts to T+200. The total duration is about 210 sec. We note that this location is near the Galactic Bulge, but that the light curve is much more like a GRB than any galactic x-ray bursting source. The peak count rate was ~1600 counts/sec (15-350 keV), at ~1 sec after the trigger in the first episode and the same rate at T+180 sec in the second episode.
This location will come out of Moon constraint at 09:00 24 Mar 06.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 23 Mar 06 14:33:20 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     202442,   Seg_Num: 0
GRB_RA:          274.245d {+18h 16m 59s} (J2000),
                 274.350d {+18h 17m 24s} (current),
                 273.397d {+18h 13m 35s} (1950)
GRB_DEC:         -36.697d {-36d 41' 50"} (J2000),
                 -36.695d {-36d 41' 40"} (current),
                 -36.716d {-36d 42' 56"} (1950)
GRB_DATE:        13816 TJD;    81 DOY;   06/03/22
GRB_TIME:        82821.12 SOD {23:00:21.12} UT
TRIGGER_INDEX:   155
GRB_PHI:         -15.25 [deg]
GRB_THETA:        30.59 [deg]
DELTA_TIME:      19.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     12.64 [sigma]
IMAGE_SIGNIF:    6.93 [sigma]
LC_URL:          sw00202442000msb.lc
SUN_POSTN:         2.59d {+00h 10m 22s}   +1.12d {+01d 07' 20"}
SUN_DIST:         89.26 [deg]   Sun_angle= 5.9 [hr] (West of Sun)
MOON_POSTN:      284.77d {+18h 59m 06s}  -27.99d {-27d 59' 25"}
MOON_DIST:        12.37 [deg]
MOON_ILLUM:      41 [%]
GAL_COORDS:      356.43, -9.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      273.50,-13.31 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 147.99,-20.50 [deg].

GCN Circular #4907
D. Palmer (LANL), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), A. Parsons (GSFC), M. Perri (ASDC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC) on behalf of 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 060322 (trigger #202442) (Perri, et al., GCN 4903). The BAT ground-calculated position is RA,Dec = 274.235,-36.721 deg {18h 16m 56.4s, -36d 43' 14.7"} (J2000) +- 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 80%.
The mask-weighted lightcurve shows two well separated episodes of emission. The first episode starts at T-22 sec and ends at T+40 sec with six main peaks within that interval. Then the emission drops below the BAT sensitivity until the second episode. The second episode starts at T+155 sec and ends at T+204 sec with six main peaks within that second interval. There is no further emission out to T+670 sec. T90 (15-350 keV) is 213 +- 5 sec (estimated error including systematics).
The time-averaged spectrum from T-21.7 to T+232.3 is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.04 +- 0.32, and Epeak of 94.4 +- 44.7 keV (chi squared 57.29 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 5.1 +- 0.2 x 10^-06 erg/cm2 and the 1-sec peak flux measured from T+182.19 sec in the 15-150 keV band is 2.1 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.58 +- 0.07 (chi squared 65.5 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
Additionally, separate spectral analyses of the two episodes in the light curve show that the second episode is spectrally softer than the first. The best fit to the first episode is a simple power law with a photon index of 1.36 +- 0.09 (chi squared 30.3 for 56 d.o.f.). The second episode is best fit by a power law with an exponential cutoff. This fit gives a photon index alpha = 0.89 +-0.31 and Epeak of 72.8 +- 12.6 keV (chi squared 51.6 for 55 d.o.f.). Fitting a simple power law to the second episode yields a power-law index of 1.69 +- 0.07 (chi squared 70.5 for 56 d.o.f.) All the quoted errors are at the 90% confidence level.
GCN Circular #4919
M. Perri, L. Vetere (ASDC), D.N. Burrows (PSU) report on behalf of the Swift XRT team:
The Swift XRT began observing the field of GRB 060322 (trigger #202442, Perri et al., GCN 4903) at 2006-03-24 11:36:11 UT, approximately 37 hours (1.5 days) after the BAT trigger. In a first XRT exposure of ~9 ks we detect a faint uncatalogued X-ray source at the following coordinates:
```
RA(J2000) = 18h 16m 56.4s
Dec(J2000) = -36d 42' 31"
```
with an estimated uncertainty of 5 arcseconds (90% containment). This position lies 45 arcseconds from the BAT refined position reported by Palmer et al. (GCN 4907).
Due to the small number of counts, we are unable to determine whether the source is decaying at this time. Observations are continuing and further analysis regarding the fading nature of this source will be issued as the data becomes available.
This circular is an official product of the Swift XRT Team.
GCN Circular #4920
M. Jel=EDnek, S. Guziy (IAA-CSIC, Granada), J. M. Gonz=E1lez-P=E9rez (IAC, La Laguna) and A. J. Castro-Tirado (IAA-CSIC), on behalf of a larger collaboration,
report:
Following the detection of the long GRB 060322 by SWIFT (Perri et al. GCNC 4903), we have observed the field with the 0.8m IAC80 telescope at Observatorio del Teide in Canary Islands. Images were taken in the R- and I-bands starting on 23.265 UT (i.e. 7.3 hr after the event), under not optimal observing conditions (high airmass and 9 degrees away from the last quarter moon). We do not detect any object within the 5" radius error box of the possible X-ray afterglow (Perri et al. GCNC 4919). The 5-sigma limiting magnitude for the co-added R-band frame (3 x 300s) is 19.3 .
This message can be quoted.
GCN Circular #4928
M. Perri, L. Vetere (ASDC), D.N. Burrows (PSU) report on behalf of the Swift XRT team:
The Swift XRT observed the field of GRB 060322 (GCN 4903, Perri et al.) for a second time on 2005-03-25 from 00:37:09 UT until 21:53:57 UT. We confirm that the X-ray source identified by Perri et al. (GCN 4919, RA(J2000) = 18h 16m 56.4s, Dec(J2000) = -36d 42' 31" ) has faded from view and is therefore the likely X-ray afterglow of this burst.
Using an exposure of ~11 ks in Photon Counting mode we place a three sigma upper limit on the 0.3-10 keV count rate of 2.0e-3 cts/s which is significantly lower than the count rate observed with the first exposure (3.0+/-0.7)e-3 cts/s, implying that the source has faded.
We conclude that the candidate reported in GCN 4919 is the X-ray afterglow of GRB 060322.
This circular is an official product of the Swift XRT Team.
GCN Circular #4937
A. Pereyra, T. Dominici, A. M. Magalh=E3es and Z. Abraham (IAG, Univ. of S=E3o Paulo) report:
We observed the field of GRB 060322 (Perri et al. GCN 4903) with the IAG- USP 60cm telescope at the Laborat=F3rio Nacional de Astrof=EDsica (LNA), Brazil. T he observations were made on March 24.342 (UT middle of observation) and 1.381 days after the burst under non-optimal sky conditions. Comparison to the DSS2 (Red) did not re veal any object inside the error circle from Perri et al. (GCN 4919). Our sequence of co- added R-band images (8x300s + 5x50s) yielded a 3-sigma limit magnitude of 18.7 using U SNO B1.0 field stars.
This message can be quoted.

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Jochen Greiner, last update: 30-Mar-2006 [Disclaimer]