Gamma-ray Burst 020801

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE


TITLE:          GCN/HETE BURST POSITION NOTICE 
NOTICE_DATE:    Thu 01 Aug 02 12:58:57 UT
NOTICE_TYPE:    HETE S/C_Alert
TRIGGER_NUM:    2177,   Seq_Num: 1
GRB_DATE:       12487 TJD;   213 DOY;   02/08/01
GRB_TIME:       46721.89 SOD {12:58:41.89} UT
TRIGGER_SOURCE: Trigger on the 25-400 keV band.
GAMMA_RATE:     153  [cnts/s]  on a 1.300 [sec] timescale
SC_-Z_RA:       304 [deg]
SC_-Z_DEC:      -19 [deg]
SC_LONG:        208 [deg East] 
SUN_POSTN:      131.55d {+08h 46m 11s}  +17.98d {+17d 58' 36"}
MOON_POSTN:      38.79d {+02h 35m 09s}  +12.02d {+12d 01' 01"}
MOON_ILLUM:     49 [%]
COMMENTS:       Probable GRB.

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Thu 01 Aug 02 12:59:32 UT
NOTICE_TYPE:    HETE S/C_Update
TRIGGER_NUM:    2177,   Seq_Num: 2
GRB_DATE:       12487 TJD;   213 DOY;   02/08/01
GRB_TIME:       46721.89 SOD {12:58:41.89} UT
TRIGGER_SOURCE: Trigger on the 25-400 keV band.
GAMMA_RATE:     153  [cnts/s]  on a 1.300 [sec] timescale
SC_-Z_RA:       304 [deg]
SC_-Z_DEC:      -19 [deg]
SC_LONG:        208 [deg East] 
WXM_CNTR_RA:    310.782d {+20h 43m 08s} (J2000),
                310.826d {+20h 43m 18s} (current),
                309.914d {+20h 39m 39s} (1950)
WXM_CNTR_DEC:   -46.849d {-46d 50' 54"} (J2000),
                -46.839d {-46d 50' 21"} (current),
                -47.029d {-47d 01' 43"} (1950)
WXM_MAX_SIZE:   60.00 [arcmin] diameter
WXM_LOC_SN:     3 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 0.5 Y= 0.5 [sig/noise]
WXM_LC_SN:      X= 3.0 Y= 2.2 [sig/noise]
SUN_POSTN:      131.55d {+08h 46m 11s}  +17.98d {+17d 58' 36"}
SUN_DIST:       151.13 [deg]
MOON_POSTN:      38.79d {+02h 35m 09s}  +12.02d {+12d 01' 01"}
MOON_DIST:       97.36 [deg] 
MOON_ILLUM:     49 [%]
GAL_COORDS:     353.15,-38.15 [deg] galactic lon,lat of the burst
ECL_COORDS:     300.27,-27.60 [deg] ecliptic lon,lat of the burst
COMMENTS:       Probable GRB.
COMMENTS:       WXM error box is circular; not rectangular.
COMMENTS:       WXM S/N is less than a reasonable value.

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Thu 01 Aug 02 13:00:25 UT
NOTICE_TYPE:    HETE S/C_Update
TRIGGER_NUM:    2177,   Seq_Num: 3
GRB_DATE:       12487 TJD;   213 DOY;   02/08/01
GRB_TIME:       46721.89 SOD {12:58:41.89} UT
TRIGGER_SOURCE: Trigger on the 25-400 keV band.
GAMMA_RATE:     153  [cnts/s]  on a 1.300 [sec] timescale
SC_-Z_RA:       304 [deg]
SC_-Z_DEC:      -19 [deg]
SC_LONG:        208 [deg East] 
WXM_CNTR_RA:    310.782d {+20h 43m 08s} (J2000),
                310.826d {+20h 43m 18s} (current),
                309.914d {+20h 39m 39s} (1950)
WXM_CNTR_DEC:   -46.849d {-46d 50' 54"} (J2000),
                -46.839d {-46d 50' 21"} (current),
                -47.029d {-47d 01' 43"} (1950)
WXM_MAX_SIZE:   60.00 [arcmin] diameter
WXM_LOC_SN:     3 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 0.5 Y= 0.5 [sig/noise]
WXM_LC_SN:      X= 3.0 Y= 2.2 [sig/noise]
SUN_POSTN:      131.55d {+08h 46m 11s}  +17.98d {+17d 58' 36"}
SUN_DIST:       151.13 [deg]
MOON_POSTN:      38.79d {+02h 35m 09s}  +12.02d {+12d 01' 01"}
MOON_DIST:       97.36 [deg] 
MOON_ILLUM:     49 [%]
GAL_COORDS:     353.15,-38.15 [deg] galactic lon,lat of the burst
ECL_COORDS:     300.27,-27.60 [deg] ecliptic lon,lat of the burst
COMMENTS:       Probable GRB.
COMMENTS:       WXM error box is circular; not rectangular.
COMMENTS:       WXM S/N is less than a reasonable value.

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/HETE BURST POSITION NOTICE 
NOTICE_DATE:    Thu 01 Aug 02 13:03:26 UT
NOTICE_TYPE:    HETE S/C_Last 
TRIGGER_NUM:    2177,   Seq_Num: 4
GRB_DATE:       12487 TJD;   213 DOY;   02/08/01
GRB_TIME:       46721.89 SOD {12:58:41.89} UT
TRIGGER_SOURCE: Trigger on the 25-400 keV band.
GAMMA_RATE:     153  [cnts/s]  on a 1.300 [sec] timescale
SC_-Z_RA:       304 [deg]
SC_-Z_DEC:      -19 [deg]
SC_LONG:        208 [deg East] 
WXM_CNTR_RA:    310.782d {+20h 43m 08s} (J2000),
                310.826d {+20h 43m 18s} (current),
                309.914d {+20h 39m 39s} (1950)
WXM_CNTR_DEC:   -46.849d {-46d 50' 54"} (J2000),
                -46.839d {-46d 50' 21"} (current),
                -47.029d {-47d 01' 43"} (1950)
WXM_MAX_SIZE:   60.00 [arcmin] diameter
WXM_LOC_SN:     3 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 0.5 Y= 0.5 [sig/noise]
WXM_LC_SN:      X= 3.0 Y= 2.2 [sig/noise]
SUN_POSTN:      131.55d {+08h 46m 11s}  +17.98d {+17d 58' 36"}
SUN_DIST:       151.13 [deg]
MOON_POSTN:      38.79d {+02h 35m 09s}  +12.02d {+12d 01' 01"}
MOON_DIST:       97.36 [deg] 
MOON_ILLUM:     49 [%]
GAL_COORDS:     353.15,-38.15 [deg] galactic lon,lat of the burst
ECL_COORDS:     300.27,-27.60 [deg] ecliptic lon,lat of the burst
COMMENTS:       Probable GRB.
COMMENTS:       WXM error box is circular; not rectangular.
COMMENTS:       WXM S/N is less than a reasonable value.

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/HETE BURST POSITION NOTICE 
NOTICE_DATE:    Thu 01 Aug 02 14:54:54 UT
NOTICE_TYPE:    HETE Ground Analysis
TRIGGER_NUM:    2177,   Seq_Num: 5
GRB_DATE:       12487 TJD;   213 DOY;   02/08/01
GRB_TIME:       46721.89 SOD {12:58:41.89} UT
TRIGGER_SOURCE: Trigger on the 25-400 keV band.
GAMMA_RATE:     153  [cnts/s]  on a 1.300 [sec] timescale
SC_-Z_RA:       303 [deg]
SC_-Z_DEC:      -19 [deg]
SC_LONG:        208 [deg East] 
WXM_CNTR_RA:    314.786d {+20h 59m 09s} (J2000),
                314.832d {+20h 59m 20s} (current),
                313.891d {+20h 55m 34s} (1950)
WXM_CNTR_DEC:   -51.924d {-51d 55' 25"} (J2000),
                -51.914d {-51d 54' 49"} (current),
                -52.119d {-52d 07' 06"} (1950)
WXM_CORNER1:    310.3090 -46.0290 [deg]
WXM_CORNER2:    319.0110 -57.8800 [deg]
WXM_CORNER3:    319.2730 -57.8150 [deg]
WXM_CORNER4:    310.5520 -45.9720 [deg] 
WXM_MAX_SIZE:   777.85 [arcmin] diameter 
WXM_LOC_SN:     3 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 0.5 Y= 0.5 [sig/noise]
WXM_LC_SN:      X= 3.0 Y= 2.2 [sig/noise]
SUN_POSTN:      131.55d {+08h 46m 11s}  +17.98d {+17d 58' 36"}
SUN_DIST:       145.96 [deg]
MOON_POSTN:      38.79d {+02h 35m 09s}  +12.02d {+12d 01' 01"}
MOON_DIST:       95.76 [deg]
MOON_ILLUM:     49 [%]
GAL_COORDS:     346.42,-40.48 [deg] galactic lon,lat of the burst
ECL_COORDS:     301.29,-33.24 [deg] ecliptic lon,lat of the burst
COMMENTS:       Definite GRB.
COMMENTS:       Burst_Validity flag is true.  
COMMENTS:       HETE GRB Coordinates.
COMMENTS:       WXM S/N is less than a reasonable value.
COMMENTS:       WXM data refined since S/C_Last Notice.
COMMENTS:       Long event (~300s)
COMMENTS:       WXM X localization is very good, but the Y localization
COMMENTS:       is weak.  The error box here is calculated using the X
COMMENTS:       localization and an assumption of Y localization
COMMENTS:       limits based on the illumination pattern of the wires
COMMENTS:       in the WXM X detector.
COMMENTS:       The same localization is found for HETE burst 2178,
COMMENTS:       detected ~300s after 2177.

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Fri 02 Aug 02 07:04:44 UT
NOTICE_TYPE:    HETE Ground Analysis
TRIGGER_NUM:    2177,   Seq_Num: 6
GRB_DATE:       12487 TJD;   213 DOY;   02/08/01
GRB_TIME:       46721.89 SOD {12:58:41.89} UT
TRIGGER_SOURCE: Trigger on the 25-400 keV band.
GAMMA_RATE:     153  [cnts/s]  on a 1.300 [sec] timescale
SC_-Z_RA:       303 [deg]
SC_-Z_DEC:      -19 [deg]
SC_LONG:        208 [deg East] 
WXM_CNTR_RA:    315.560d {+21h 02m 14s} (J2000),
                315.606d {+21h 02m 26s} (current),
                314.650d {+20h 58m 36s} (1950)
WXM_CNTR_DEC:   -53.770d {-53d 46' 13"} (J2000),
                -53.760d {-53d 45' 36"} (current),
                -53.968d {-53d 58' 03"} (1950)
WXM_CORNER1:    315.8340 -53.9360 [deg]
WXM_CORNER2:    315.5930 -53.9950 [deg]
WXM_CORNER3:    315.2850 -53.6050 [deg]
WXM_CORNER4:    315.5260 -53.5460 [deg] 
WXM_MAX_SIZE:   27.80 [arcmin] diameter  
WXM_LOC_SN:     3 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 0.5 Y= 0.5 [sig/noise]
WXM_LC_SN:      X= 3.0 Y= 2.2 [sig/noise]
SUN_POSTN:      131.55d {+08h 46m 11s}  +17.98d {+17d 58' 36"}
SUN_DIST:       144.08 [deg]
MOON_POSTN:      38.79d {+02h 35m 09s}  +12.02d {+12d 01' 01"}
MOON_DIST:       95.70 [deg]
MOON_ILLUM:     49 [%]
GAL_COORDS:     343.92,-40.69 [deg] galactic lon,lat of the burst
ECL_COORDS:     301.06,-35.13 [deg] ecliptic lon,lat of the burst
COMMENTS:       Definite GRB.
COMMENTS:       Burst_Validity flag is true.  
COMMENTS:       HETE GRB Coordinates.
COMMENTS:       Probable GRB.
COMMENTS:       WXM S/N is less than a reasonable value.
COMMENTS:       WXM data refined since S/C_Last Notice.
COMMENTS:       Long event (~300s)
COMMENTS:       Localization includes data from HETE burst 2178,
COMMENTS:       detected ~300s after 2177.

GCN notice #1462
P. Kilmartin (p.kilmartin@phys.canterbury.ac.nz) and A. Gilmore, Mount John Observatory, on behalf of the AAVSO International GRB Network, report:
We have imaged the error circle of the long GRB020801 (HETE trigger 2177/8) using the MJO 0.6m telescope and ST-9E CCD. Fifteen unfiltered 60-second exposures, centered on UT 020802.383 (20hrs after the burst), were taken and median combined, and with a limiting magnitude of roughly R=20 based on USNO-A2.0. Comparing against the DSS, we find a new object with approximate R magnitude of 19.4, located at
```
   21:02:37.34  -53:44:59.3  J2000
```
Frames taken 21 min apart show no movement, and the AAVSO web site indicates no known asteroid is in this field of view. We have continued imaging much of the error circle, but have found nothing else that is not on the DSS images.
We have placed a 5x5arcmin finding chart marking the new object at: ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb020801.jpg The object appears extended on this finding chart, but appears stellar on other later image sets.
The AAVSO would like to thank the Curry Foundation for supporting the AAVSO International GRB Network.
GCN notice #1464
Derek Fox (Caltech) and Paul Price (RSA/ANU) report:
The OT candidate for GRB020801 (HETE Triggers 2177 and 2178) reported by Kilmartin & Gilmore (GCN 1462) is detected in the Digitized Sky Survey (POSS-II) N-emulsion (~I-band) image at a similar magnitude to that seen in their finding chart. Given the unfiltered nature of their observations it seems likely that this represents a redetection of the DSS source rather than a new source and candidate OT.
GCN notice #1465
GRB020801: Imaging of Suggested OT Counterpart at the Magellan Observatory
M. Garcia and D. Rusin (CFA); N. Butler, A. Dullighan, G. Ricker, and R. Vanderspek (MIT)
write:
We have imaged the suggested optical counterpart of GRB020801 (Kilmartin and Gilmore; GCN 1462), which was localized in the X-ray band by HETE, with the LDSS-2 instrument on Magellan 1 (Walter A. Baade Telescope), obtaining two broadband CCD images. By comparing the Kilmartin-Gilmore object with the USNO A-2 stars in the field, we derive approximate magnitudes of 19.31 (03 Aug 2002, 02:01 UT) and 19.61 (03 Aug 2002, 02:20 UT) for the object. We estimate our magnitude conversion to R has a zero point rms error of 0.4 magnitudes, and that our internal photometric errors have rms errors of 0.03 magnitudes. The brightness of the Kilmartin-Gilmore object which we measure agrees well with that cited in GCN 1462, but also indicates that the object is variable. The lack of fading rules out this object as the GRB afterglow counterpart (as suggested by Fox and Price; GCN 1464); the fluctuations may indicate that it is a variable (dMe?) star.
This message may be cited.

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Jochen Greiner, last update: 26-Aug-2002 [Disclaimer]