Gamma-ray Burst 060507

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 07 May 06 01:53:32 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     208870,   Seg_Num: 0
GRB_RA:           89.972d {+05h 59m 53s} (J2000),
                  90.187d {+06h 00m 45s} (current),
                  88.275d {+05h 53m 06s} (1950)
GRB_DEC:         +75.237d {+75d 14' 13"} (J2000),
                 +75.237d {+75d 14' 13"} (current),
                 +75.233d {+75d 13' 58"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4470 [cnts]    Image_Peak=142 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   148     E_range: 25-100 keV
BKG_INTEN:       29382 [cnts]
BKG_TIME:        6774.82 SOD {01:52:54.82} UT
BKG_DUR:         8 [sec]
GRB_DATE:        13862 TJD;   127 DOY;   06/05/07
GRB_TIME:        6792.23 SOD {01:53:12.23} UT
GRB_PHI:         -84.73 [deg]
GRB_THETA:        32.60 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.92 [sigma]
IMAGE_SIGNIF:    7.19 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +3  +0  +0 -44  +1 
SUN_POSTN:        43.92d {+02h 55m 40s}  +16.74d {+16d 44' 13"}
SUN_DIST:         63.44 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      159.34d {+10h 37m 22s}  +11.29d {+11d 17' 25"}
MOON_DIST:        73.84 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      138.58, 22.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       89.99, 51.80 [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 = 6.30,3.62 [deg].

red DSS finding chart ps-file

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 07 May 06 01:57:48 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     11314231,   Seg_Num: 67
GRB_RA:           89.972d {+05h 59m 53s} (J2000),
                  91.467d {+06h 05m 52s} (current),
                  88.275d {+05h 53m 06s} (1950)
GRB_DEC:         +75.237d {+75d 14' 13"} (J2000),
                 +75.234d {+75d 14' 02"} (current),
                 +75.233d {+75d 13' 58"} (1950)
GRB_DATE:        27639 TJD;   13904 DOY;   06/150194416/134791133
GRB_TIME:        13020.00 SOD {03:37:00.00} UT
TRIGGER_INDEX:   148
GRB_PHI:         -84.73 [deg]
GRB_THETA:        32.60 [deg]
DELTA_TIME:      3338.00 [sec]
TRIGGER_DUR:     1.024 [sec]
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.92 [sigma]
IMAGE_SIGNIF:    7.19 [sigma]
LC_URL:          sw00208870000msb.lc
SUN_POSTN:        43.92d {+02h 55m 41s}  +16.74d {+16d 44' 16"}
SUN_DIST:         63.69 [deg]   Sun_angle= -3.2 [hr] (East of Sun)
MOON_POSTN:      159.37d {+10h 37m 29s}  +11.27d {+11d 16' 29"}
MOON_DIST:        73.56 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      138.58, 22.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       89.99, 51.80 [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 = 6.30,3.62 [deg].
COMMENTS:        The 3rd packet (of 3) was missing in the lightcurve data stream.

GCN Circular #5084
L. M. Barbier (NASA/GSFC), S. D. Barthelmy (GSFC), M.L. Conciatore (ASDC), J. R. Cummings (NASA/ORAU), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), A. M. Parsons (GSFC), M. Perri (ASDC), M. Stamatikos (NASA/GSFC/ORAU) and L. Vetere (ASDC) report on behalf of the Swift Team:
At 01:53:12 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060507 (trigger=208870). Swift did not slew because of Earth observing constraint. The BAT on-board calculated location is RA,Dec 89.972,+75.237 {05h 59m 53s,+75d 14' 13"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The lightcurve shows multiple peaks starting at ~T-8 sec and ending ~T+25 sec with a peak count rate of ~1000 counts/sec at ~T+1 sec.
Because of an Earth limb constraint, the spacecraft did not slew promptly to the BAT position, and so there are no immediate XRT and UVOT data products to analyze.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 07 May 06 02:40:05 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     208870,   Seg_Num: 0
POINT_RA:         90.097d {+06h 00m 23s} (J2000)
POINT_DEC:       +75.198d {+75d 11' 52"} (J2000)
IMG_START_DATE:  13862 TJD;   127 DOY;   06/05/07
IMG_START_TIME:  9578.25 SOD {02:39:38.25} UT,   2786.0 [sec] since BAT Trigger Time
COUNTS:          8    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:     Sun 07 May 06 02:43:05 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     208870,   Seg_Num: 0
POINT_RA:         90.096d {+06h 00m 23s} (J2000)
POINT_DEC:       +75.198d {+75d 11' 51"} (J2000)
POINT_ROLL:      230.529d
IMG_START_DATE:  13862 TJD;   127 DOY;   06/05/07
IMG_START_TIME:  9582.33 SOD {02:39:42.33} UT,   2790.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.403
N_STARS:         42
X_OFFSET:        650 [pixels]
Y_OFFSET:        891 [pixels]
X_MAX:           1609 [pixels]
Y_MAX:           1850 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00208870000msufc2790.fits
SUN_POSTN:        43.95d {+02h 55m 48s}  +16.75d {+16d 44' 47"}
SUN_DIST:         63.42 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      159.71d {+10h 38m 51s}  +11.11d {+11d 06' 33"}
MOON_DIST:        74.07 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      138.64, 22.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       90.04, 51.76 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 07 May 06 02:44:35 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     208870,   Seg_Num: 0
POINT_RA:         90.096d {+06h 00m 23s} (J2000)
POINT_DEC:       +75.198d {+75d 11' 51"} (J2000)
ROLL:            230.529d
IMG_START_DATE:  13862 TJD;   127 DOY;   06/05/07
IMG_START_TIME:  9582.33 SOD {02:39:42.33} UT,   2790.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     168662383
X_OFFSET:        970 [pixels]
Y_OFFSET:        1211 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1130
Y_GRB_POS:       1371
BINNING_INDEX:   1
IM_URL:          sw00208870000msuni2790.fits
SUN_POSTN:        43.95d {+02h 55m 49s}  +16.75d {+16d 44' 49"}
SUN_DIST:         63.42 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      159.72d {+10h 38m 53s}  +11.10d {+11d 06' 13"}
MOON_DIST:        74.08 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      138.64, 22.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       90.04, 51.76 [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 Circular #5085
L. Vetere, M.L. Conciatore, M. Perri (ASDC), D.N. Burrows (PSU) and L. M. Barbier (NASA/GSFC) report on behalf of the Swift/XRT team:
The Swift XRT began observing GRB 060707 (trigger #208870, Barbier et al., GCN 5084) at 02:39:33 UT, 46 minutes after the BAT trigger. Analysis of the initial TDRSS downliked data reveals a faint and uncataloged source at the following coordinates:
```
RA(J2000) = 05h 59m 51.9s
Dec(J2000) = +75d 14' 56"
```
with an estimated uncertainty of 7.5 arcseconds (90% containment). This position lies 43 arcseconds from the center of the BAT error circle reported in GCN 5084.
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 #5086
J. P. Halpern (Columbia U.) and N. Mirabal (U. Michigan) report on behalf of the MDM Observatory GRB follow-up team:
"We took a single 60 s R-band exposure of the Swift BAT location of GRB 060507 (Barbier et al., GCN 5084) with the MDM 1.3m telescope on May 7 02:57 UT, 64 minutes after the trigger. We see no new object within the 3' error circle, or at the XRT candidate position of Vetere et al. (GCN 5085), to a limit of approximately R=19.2. Evening twilight and telescope pointing constraints prevent any further observations.
This message may be cited."
GCN Circular #5087
L. Vetere, M.L. Conciatore, M. Capalbi, M. Perri (ASDC), D.N. Burrows (PSU) and L. M. Barbier (NASA/GSFC) report on behalf of the Swift/XRT team:
We have analysed the first 5 orbits of XRT data from GRB 060507 (Barbier et al., GCN 5084). A 11ks photon counting mode image provides a refined XRT position:
```
RA(J2000)  =  05 59 51.7
Dec(J2000) = +75 14 56.6
```
with an uncertainty of 4 arcsec (90% containment). This is 1 arcsec away from the initial XRT position quoted in GCN 5085 (Vetere et al.).
The X-ray light curve decays with a single powerlaw, fitting the last 4 orbits we find a decay index of -1.0 +/- 0.1.
A power-law fit to the X-ray spectrum from T+2.8ks to T+28.3ks gives a photon index of 2.1+/-0.1 and a column density of (1.7+/-0.4)e21 cm^-2. We note that the galactic hydrogen column density in the direction of the burst is 8.8e20cm^-2. The 0.2-10.0 keV observed flux is 2.2e-12 ergs cm^-2 s^-1, which corresponds to an unabsorbed flux of 3.4e-12 ergs cm^-2 s^-1.
If the burst continues decaying at the current rate we estimate an XRT count rate of 0.009 counts/s at T + 24hr, which corresponds to an observed 0.2-10.keV flux of 6.8e-13 ergs cm^-2 s^-1.
This circular is an official product of the Swift XRT Team.
GCN Circular #5088
F. E. Marshall and L. M. Barbier (NASA/GSFC) report on behalf of the Swift/UVOT team:
The Swift UVOT began observing GRB 060507 (trigger #208870, Barbier et al., GCN 5084) 46 minutes after the BAT trigger. No optical afterglow is detected inside the error region of the candidate XRT afterglow (Vetere et al. GCN 5085). Typical upper limits for a 3.5 arc sec aperture are given below for the initial UVOT exposures. T is the time since the BAT trigger in seconds at the start of the exposure. No correction has been made for the expected extinction corresponding to E(B-V) = 0.16 mag.
```
  T   Exposure  filter  5-sigma UL
(sec)  (sec)
2790    98      White   19.4 mag
2896   197      V       18.7 mag
9567   295      White   20.6 mag
```
GCN Circular #5090
J. Tueller (GSFC), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), M. Koss (UMD), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), 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 060507 (trigger #208870) (Barbier, et al., GCN 5089). The BAT ground-calculated position is RA,Dec = 89.935,+75.243 deg {5h 59m 44.3s,+75d 14' 36.1"} (J2000) +- 5.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 33%.
The light curve shows an initial peak with a long decay, followed by a series of smaller peaks between T+100 and T+200 seconds. Currently, there are four gaps in the telemetry downlinked data which prevent us from analyzing this burst between T-42 to T-10.3 sec, T+78.4 to T+80.6, T+88.7 to T+98.6, and T+167.4 to T+170.6 sec. T90 (15-350 keV) is 185 +- 5 sec (estimated error including systematics). The very long duration and absence of short timescale spikes in the lightcurve could be indicative of a high redshift event.
The time-averaged spectrum from T-10 to T+192 (minus the gaps listed above) is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.83 +- 0.09. Because of the data gaps, the lower limit on the fluence in the 15-150 keV band is 4.1 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+1.24 sec in the 15-150 keV band is 1.3 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #5091
L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team:
Now having recieved the full downlinked data that fills in the gaps (Tueller et al, GCN 5090), we report the updated refined analysis on Swift-BAT GRB 060507 (trigger 208870).
The lightcurve description in GCN 5090 does not change, nor does T90.
The time-averaged spectrum from T-10.2 to T+192.4 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.83 +- 0.09. The fluence in the 15-150 keV band is 4.5 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+1.24 sec in the 15-150 keV band is 1.3 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #5092
Martin Jelinek (IAA Granada), Petr Kubanek (ISDC Versiox and ASU Ondrejov), Rene Hudec, Martin F. Nekola, Filip Munz and Jan Strobl (ASU Ondrejov)
report
Telescope BART in Ondrejov observatory in Czech Republic observed the Swift-detected GRB 060507 (Barbier et al, GCN 5084; Vetere et al, GCN 5085; Vetere et al, GCN 5087; Tueller et al, GCN 5090; Barbier et al, GCN 5091) starting 60.3s after the GRB trigger.
We do not detect any new source in the XRT nor BAT errorboxes. Particularly we set the first 60s unfiltered exposure 3-sigma limit calibrated using USNO-A2.0 R-band as R>15.5.
GCN Circular #5094
Christina C. Thoene, Brian L. Jensen, Johan Fynbo (Dark Cosmology Centre), Jan-Erik Solheim (University of Oslo) report
We observed the field of GRB060507 (GCN 5084) in the I-band with the NOT and ALFOSC on La Palma, starting at May 7th, UT 03:08:19 (1.13h after the burst) at high airmass. On the edge of the XRT revised error circle (99% confidence) (GCN 5087) we detect a new source at the position (J2000)
```
RA = 05:59:50.52
Dec = +75:14:55.9
```
The preliminary I-band magnitude obtained from 3x300s stacked images with a mean time of 1.3h after the burst is
I = 19.1 +- 0.1 (compared to four nearby USNO stars)
5x300 I-band images from May 9th show that the source is transient and therefore likely to be the afterglow of GRB060507
A finding chart is available at: http://www.astro.ku.dk/~brian_j/grb/grb060507.079/
Note from March 4, 2021:
The redshift of z=0.0890 listed in Simbad, and referenced with 2009ApJ...690..163R (Roming: The first Swift ultraviolet/optical telescope GRB afterglow catalog) refers to GRB 060505, not to 060507.

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Jochen Greiner, last update: 04-Mar-2021 [Disclaimer]