Gamma-ray Burst 080701

(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:     Tue 01 Jul 08 10:13:59 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     315615,   Seg_Num: 0
GRB_RA:           45.837d {+03h 03m 21s} (J2000),
                  46.078d {+03h 04m 19s} (current),
                  44.440d {+02h 57m 46s} (1950)
GRB_DEC:         +75.492d {+75d 29' 30"} (J2000),
                 +75.525d {+75d 31' 29"} (current),
                 +75.295d {+75d 17' 43"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5884 [cnts]    Image_Peak=449 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   139     E_range: 15-50 keV
BKG_INTEN:       32951 [cnts]
BKG_TIME:        36805.09 SOD {10:13:25.09} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14648 TJD;   183 DOY;   08/07/01
GRB_TIME:        36817.63 SOD {10:13:37.63} UT
GRB_PHI:         -67.99 [deg]
GRB_THETA:        27.11 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     26.15 [sigma]
IMAGE_SIGNIF:    16.10 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +1 +10  +0  +0 -51  +1 
SUN_POSTN:       100.82d {+06h 43m 16s}  +23.07d {+23d 03' 55"}
SUN_DIST:         59.20 [deg]   Sun_angle= 3.6 [hr] (West of Sun)
MOON_POSTN:       74.67d {+04h 58m 41s}  +27.23d {+27d 14' 03"}
MOON_DIST:        50.34 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      131.04, 14.74 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       72.39, 54.76 [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 = 183.27,4.99 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Jul 08 10:17:09 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     315615,   Seg_Num: 0
GRB_RA:           45.837d {+03h 03m 21s} (J2000),
                  46.078d {+03h 04m 19s} (current),
                  44.440d {+02h 57m 46s} (1950)
GRB_DEC:         +75.492d {+75d 29' 30"} (J2000),
                 +75.525d {+75d 31' 29"} (current),
                 +75.295d {+75d 17' 43"} (1950)
GRB_DATE:        14648 TJD;   183 DOY;   08/07/01
GRB_TIME:        36817.63 SOD {10:13:37.63} UT
TRIGGER_INDEX:   139
GRB_PHI:         -67.99 [deg]
GRB_THETA:        27.11 [deg]
DELTA_TIME:      25.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     26.15 [sigma]
IMAGE_SIGNIF:    16.10 [sigma]
LC_URL:          sw00315615000msb.lc
SUN_POSTN:       100.82d {+06h 43m 16s}  +23.07d {+23d 03' 54"}
SUN_DIST:         59.20 [deg]   Sun_angle= 3.6 [hr] (West of Sun)
MOON_POSTN:       74.71d {+04h 58m 50s}  +27.24d {+27d 14' 11"}
MOON_DIST:        50.34 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      131.04, 14.74 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       72.39, 54.76 [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 = 183.27,4.99 [deg].

GCN Circular #7910
M. C. Stroh (PSU), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Guidorzi (INAF-OAB), E. A. Hoversten (PSU), C. Pagani (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL), D. Perez (U Leicester), P. Romano (INAF-IASFPA), T. Sakamoto (NASA/UMBC), R. L. C. Starling (U Leicester), T. N. Ukwatta (GSFC/GWU), L. Vetere (PSU) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team:
At 10:13:37 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080701 (trigger=315615). Swift did not immediately slew due to an Earth limb constraint. The BAT on-board calculated location is RA, Dec 45.837, +75.492 which is
```
   RA(J2000) = 03h 03m 21s
   Dec(J2000) = +75d 29' 30"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a smooth peak structure with a duration of ~15 sec. The peak count rate was ~2500 counts/sec (15-350 keV), at ~1 sec after the trigger.
Swift was unable to slew to the source due to due to Earth limb constraints. X-ray telescope and UV/optical telescope observations of this region will become possible at T+50 minutes.
Burst Advocate for this burst is M. C. Stroh (stroh AT astroh.org). 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:     Tue 01 Jul 08 11:00:57 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     315615,   Seg_Num: 0
POINT_RA:         45.690d {+03h 02m 46s} (J2000)
POINT_DEC:       +75.490d {+75d 29' 26"} (J2000)
IMG_START_DATE:  14648 TJD;   183 DOY;   08/07/01
IMG_START_TIME:  39614.40 SOD {11:00:14.40} UT,   2796.8 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    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:     Tue 01 Jul 08 11:07:29 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     315615,   Seg_Num: 0
POINT_RA:         45.689d {+03h 02m 45s} (J2000)
POINT_DEC:       +75.488d {+75d 29' 18"} (J2000)
POINT_ROLL:      118.588d
IMG_START_DATE:  14648 TJD;   183 DOY;   08/07/01
IMG_START_TIME:  39798.97 SOD {11:03:18.97} UT,   2981.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.030
N_STARS:         61
X_OFFSET:        600 [pixels]
Y_OFFSET:        315 [pixels]
X_MAX:           1559 [pixels]
Y_MAX:           1274 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    12
SL_URL:          sw00315615000msufc2981.fits
SUN_POSTN:       100.85d {+06h 43m 25s}  +23.06d {+23d 03' 45"}
SUN_DIST:         59.24 [deg]   Sun_angle= 3.7 [hr] (West of Sun)
MOON_POSTN:       75.30d {+05h 01m 11s}  +27.27d {+27d 16' 07"}
MOON_DIST:        50.41 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      131.01, 14.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       72.33, 54.77 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 01 Jul 08 11:08:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     315615,   Seg_Num: 0
POINT_RA:         45.689d {+03h 02m 45s} (J2000)
POINT_DEC:       +75.488d {+75d 29' 18"} (J2000)
POINT_ROLL:      118.588d
IMG_START_DATE:  14648 TJD;   183 DOY;   08/07/01
IMG_START_TIME:  39798.97 SOD {11:03:18.97} UT,   2981.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.030
N_STARS:         61
X_OFFSET:        600 [pixels]
Y_OFFSET:        315 [pixels]
X_MAX:           1559 [pixels]
Y_MAX:           1274 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    12
SL_URL:          sw00315615000msufc2981.fits
SUN_POSTN:       100.85d {+06h 43m 25s}  +23.06d {+23d 03' 45"}
SUN_DIST:         59.24 [deg]   Sun_angle= 3.7 [hr] (West of Sun)
MOON_POSTN:       75.31d {+05h 01m 13s}  +27.27d {+27d 16' 09"}
MOON_DIST:        50.41 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      131.01, 14.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       72.33, 54.77 [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:     Tue 01 Jul 08 11:08:58 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     315615,   Seg_Num: 0
POINT_RA:         45.689d {+03h 02m 45s} (J2000)
POINT_DEC:       +75.488d {+75d 29' 18"} (J2000)
ROLL:            118.588d
IMG_START_DATE:  14648 TJD;   183 DOY;   08/07/01
IMG_START_TIME:  39798.97 SOD {11:03:18.97} UT,   2981.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     236603001
X_OFFSET:        919 [pixels]
Y_OFFSET:        634 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1079
Y_GRB_POS:       794
BINNING_INDEX:   1
IM_URL:          sw00315615000msuni2981.fits
SUN_POSTN:       100.85d {+06h 43m 25s}  +23.06d {+23d 03' 45"}
SUN_DIST:         59.24 [deg]   Sun_angle= 3.7 [hr] (West of Sun)
MOON_POSTN:       75.31d {+05h 01m 16s}  +27.27d {+27d 16' 10"}
MOON_DIST:        50.41 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      131.01, 14.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       72.33, 54.77 [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:     Tue 01 Jul 08 11:09:16 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     315615,   Seg_Num: 0
POINT_RA:         45.689d {+03h 02m 45s} (J2000)
POINT_DEC:       +75.488d {+75d 29' 18"} (J2000)
ROLL:            118.588d
IMG_START_DATE:  14648 TJD;   183 DOY;   08/07/01
IMG_START_TIME:  39798.97 SOD {11:03:18.97} UT,   2981.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     236603001
X_OFFSET:        919 [pixels]
Y_OFFSET:        634 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1079
Y_GRB_POS:       794
BINNING_INDEX:   1
IM_URL:          sw00315615000msuni2981.fits
SUN_POSTN:       100.85d {+06h 43m 25s}  +23.06d {+23d 03' 45"}
SUN_DIST:         59.24 [deg]   Sun_angle= 3.7 [hr] (West of Sun)
MOON_POSTN:       75.32d {+05h 01m 16s}  +27.27d {+27d 16' 11"}
MOON_DIST:        50.41 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      131.01, 14.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       72.33, 54.77 [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_sources_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #7911
M.C. Stroh, C. Pagani (PSU) and P. Evans (U. Leicester) report on behalf of the Swift-XRT team.
The XRT began observing the field at 11:00:14.4 UT, 2796.8 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 45.83937, 75.47535 which is equivalent to:
```
  RA(J2000)  = 03h 03m 21.45s
  Dec(J2000) = +75d 28' 31.3"
```
with an uncertainty of 3.1 arcseconds (radius, 90% containment). This location is 59 arcseconds from the BAT onboard position, within the BAT error circle.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (1.78e+21 cm-2, Kalberla et al. 2005), with an excess column of 6.3 (+3.88/-3.07) x 10^21 cm-2 (90% confidence).
This is an official product of the Swift-XRT team.
GCN Circular #7913
E. Fenimore (LANL), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), M. C. Stroh (PSU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-120 to T+285 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080701A (trigger #315615) (Stroh, et al., GCN Circ. 7910). The BAT ground-calculated position is RA, Dec = 45.944, 75.481 deg which is
```
   RA(J2000)  =  03h 03m 46.5s 
   Dec(J2000) = +75d 28' 50.7" 
```
with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 55%.
The mask-weighted light curve shows a single FRED-like peak starting at ~T-2 sec, peaking at ~T+0 sec, and ending at ~T+20 sec. T90 (15-350 keV) is 18 +- 9 sec (estimated error including systematics).
The time-averaged spectrum from T-2.7 to T+24.6 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.24 +- 0.17. The fluence in the 15-150 keV band is 7.1 +- 0.7 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.08 sec in the 15-150 keV band is 2.2 +- 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/315615/BA/
GCN Circular #7914
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 699 s of overlapping XRT Photon Counting mode and UVOT data for GRB 080701, 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 = 45.83882, +75.47479 which is equivalent to:
```
RA (J2000): 03h 03m 21.32s
Dec (J2000): +75d 28' 29.3"
```
with an uncertainty of 1.7 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 http://www.swift.ac.uk/xrt_positions/Goad.pdf), the current algorithm is an extension of this method.
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #7915
P.A. Milne (U Arizona) reports on behalf of the Super-LOTIS team:
The robotic 0.6m Super-LOTIS telescope began R-band observations of the error region of GRB 080701A at 10:14:25 UT, 49 seconds after the trigger. Initial 10 and 20 second exposures reveal no sources other than those present in the relevant DSS image. A stack of 30x60sec images reveals no source at the location of the XRT source (Stroh et al., GCN 7911), down to a 3-sigma limiting magnitude of R~19.5. Comparisons of initial and final images reveals no brightening or fading sources.
We used the USNO-B star at RA=03:02:55.5, Dec=+75:28:42 to derive the R2 magnitude upper-limit.
This message can be cited.
GCN Circular #7916
F.E. Marshall (NASA/GSFC) and M.C. Stroh (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 080701A starting 2983 s after the BAT trigger (Stroh et al., GCN Circ. 7910). We do not find a source in any of the UVOT observations inside the enhanced XRT error circle (Evans et al., GCN Circ. 7914). The 3-sigma upper limits for detecting a source in the first finding chart (FC) exposure and co-added frames are:
```
Filter            T_start(s)   T_stop(s)     Exp(s)     Mag (3-sigma UL)

white (FC)        2983         3082           98        >19.7
white             2983         9403          736        >21.0
v                 3914         4113          197        >19.1
b                 3298         4934          393        >20.2
u                 3093         4728          393        >19.9
uvw1              4324         4523          197        >20.0
uvm2              4119         4318          197        >19.6
uvw2              3709         3908          197        >20.2
```
The values quoted above are not corrected for the expected Galactic extinction corresponding to a reddening of E(B-V) = 0.54 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #7917
Rossi, A. (TLS Tautenburg), Gonsalves, E. (U. Dartmouth), Schulze, S. (TLS Tautenburg), Klose, S. (TLS Tautenburg), Filgas, R. (TLS Tautenburg), and Ludwig, F. (TLS Tautenburg) report on behalf of a larger collaboration:
We observed the X-ray error circle of the Swift GRB 080701A (Evans, P. A. et al., GCN 7914; Stroh, M. C. et al., GCN 7910) with the TLS 1.34m Schmidt telescope under good observing conditions (seeing is about 1-2 arcsec and very good visibility). We obtained in total 10 x 150 sec images starting at 21:02 UT and 5 x 300 sec images starting at 21:40 UT in the I band. We did not find any new source in the stacked image down to the 3-sigma limiting magnitude of 21.7 mag calibrated on USNO-B1 field.
This message can be cited.
GCN Circular #7918
C. Peters (Goshen College) and P. Garnavich (Notre Dame) report:
We observed the field of GRB 080701A with the Vatican Advanced Technology Telescope (VATT) beginning July 1.46 (UT) or 45 minutes after the bursts (Stroh et al. GCN 7910). Four exposures totaling 190 sec in the R-band were obtained. The combined image was calibrated assuming the brightness of the USNO-B1 star at RA=3:03:21.50 DEC=75:28:15.48 is R=16.52.
No source is detected down to R=22.0 at the improved XRT position (Evans et al. GCN 7914).
GCN Circular #7919
M.C. Stroh (PSU) reports on behalf of the Swift-XRT team.
We have analyzed the first four orbits of Swift-XRT data obtained for GRB 080701 (Stroh et al., GCN Circ. 7910), totaling 2.4ks of Photon Counting data.
The UVOT-enhanced XRT position has been given by Evans et al. in GCN Circ 7914.
The X-ray light-curve can be fit by a power-law with a decay index of 1.04 +/- 0.27. Assuming a constant decay rate, we predict counting rates at T+24 and T+48 hours of 4.55e-3 and 2.21e-3 cts/s respectively.
The spectrum can be fit with a power-law in excess of the Galactic value (1.78e21 cm-2, Kalberla et al. 2005), with an excess column of 9.21 (+6.43/-4.78)e21 cm^-2 and a photon index of 2.93 (+0.79/-0.59). The observed (unabsorbed) 0.3-10 keV flux is 3.55e-12 (1.976e-11) ergs/ cm^2/s.
This is an official product of the Swift-XRT team.
GCN Circular #7928
J. Wren, W.T. Vestrand, P.R. Wozniak, H. Davis, B. Norman of Los Alamos National Laboratory report:
The RAPTOR telescope system responded to Swift trigger 315615 (Stroh et al., GCN 7910) under good observing conditions. Our narrow-field instruments began observing the location at 10:14:06.47 UTC, 28.8 s after the Swift trigger. We detect no counterpart at the improved XRT position (Evans et al., GCN 7914). The limiting magnitudes of our unfiltered observations when calibrated to the USNO-B1 R-band are given in the following table. The GRB location was also within the field of view of our continuous all-sky monitoring system. We can place 3 sigma limits at or below magnitude 9.4 during the time period within 2 minutes both before and after the trigger.
```
t-mid(s)    exp(s)     mag     mag-err
--------------------------------------------
-11.68      10.0       9.7     3 sigma limit
11.57       10.0      10.0     3 sigma limit
34.80       10.0       9.9     3 sigma limit
71.45       45.0      19.3     3 sigma limit
173.93     100.0      19.8     3 sigma limit
300.65     100.0      19.9     3 sigma limit
561.10     270.0      20.5     3 sigma limit
```

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Jochen Greiner, last update: 03-Jul-2008 [Disclaimer]