Gamma-ray Burst 061110B

(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:     Fri 10 Nov 06 22:09:01 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     238174,   Seg_Num: 0
GRB_RA:          323.901d {+21h 35m 36s} (J2000),
                 323.987d {+21h 35m 57s} (current),
                 323.281d {+21h 33m 07s} (1950)
GRB_DEC:          +6.877d {+06d 52' 37"} (J2000),
                  +6.908d {+06d 54' 28"} (current),
                  +6.653d {+06d 39' 11"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       14131 [cnts]    Image_Peak=361 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   307     E_range: 50-350 keV
BKG_INTEN:       117876 [cnts]
BKG_TIME:        79070.43 SOD {21:57:50.43} UT
BKG_DUR:         40 [sec]
GRB_DATE:        14049 TJD;   314 DOY;   06/11/10
GRB_TIME:        79125.54 SOD {21:58:45.54} UT
GRB_PHI:         -25.25 [deg]
GRB_THETA:        15.37 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     16.30 [sigma]
IMAGE_SIGNIF:    8.14 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +3  +6  +0  +0 +17  +1 
SUN_POSTN:       225.91d {+15h 03m 39s}  -17.30d {-17d 17' 46"}
SUN_DIST:         99.72 [deg]   Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN:      120.72d {+08h 02m 54s}  +24.80d {+24d 48' 05"}
MOON_DIST:       141.03 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:       61.27,-31.71 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      328.63, 20.03 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
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 = 15.55,9.35 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 10 Nov 06 22:09:20 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     238174,   Seg_Num: 0
GRB_RA:          323.901d {+21h 35m 36s} (J2000),
                 323.987d {+21h 35m 57s} (current),
                 323.281d {+21h 33m 07s} (1950)
GRB_DEC:          +6.877d {+06d 52' 37"} (J2000),
                  +6.908d {+06d 54' 28"} (current),
                  +6.653d {+06d 39' 11"} (1950)
GRB_DATE:        14049 TJD;   314 DOY;   06/11/10
GRB_TIME:        79125.54 SOD {21:58:45.54} UT
TRIGGER_INDEX:   307
GRB_PHI:         -25.25 [deg]
GRB_THETA:        15.37 [deg]
DELTA_TIME:      -70.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     16.30 [sigma]
IMAGE_SIGNIF:    8.14 [sigma]
LC_URL:          sw00238174000msb.lc
SUN_POSTN:       225.91d {+15h 03m 39s}  -17.30d {-17d 17' 46"}
SUN_DIST:         99.72 [deg]   Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN:      120.73d {+08h 02m 55s}  +24.80d {+24d 48' 03"}
MOON_DIST:       141.03 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:       61.27,-31.71 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      328.63, 20.03 [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 = 15.55,9.35 [deg].

GCN Circular #5800
D. B. Fox (PSU), S. D. Barthelmy (GSFC), M. M. Chester (PSU), N. Gehrels (NASA/GSFC), D. Grupe (PSU), J. A. Kennea (PSU), K. M. McLean (LANL/UTD), C. Pagani (PSU), D. M. Palmer (LANL), P. Roming (PSU), T. Sakamoto (NASA/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester) and L. Vetere (PSU) report on behalf of the Swift Team:
At 21:58:45 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 061110B (trigger=238174). The BAT on-board calculated location is RA,Dec 323.901, +6.877 {21h 35m 36s, +06d 52' 37"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows several peaks starting at ~T-18 sec and ending at ~T+30 sec with a duration of about 45 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~8 sec after the trigger.
Because of an Earth limb constraint, the spacecraft did not slew promptly to the BAT position, and so there are no immediate XRT or UVOT data products to analyze. The XRT and UVOT will begin observing this field at 22:52 UT.
GCN Circular #5801
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 061110B detected by SWIFT (trigger 238174) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France.
The observations started 621.9s after the GRB trigger (6.1s after the notice). The elevation of the field decreased from from 22 degrees above horizon and weather conditions were good.
The date of trigger : t0 = 2006-11-10T21:58:45.120
The first image is 90.0s exposure in tracking mode. We do not detect any OT with a limiting magnitude of: t0+622s to t0+712s : R > 16.6
We co-added a series of exposures: t0+622s to t0+1098s : R > 16.9
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
Further observations are planed.
N.B. Galactic coordinates are lon= 61.2688 lat=-31.7065 and the galactic extinction in R band is 0.2 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 10 Nov 06 22:49:34 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     238174,   Seg_Num: 0
POINT_RA:        323.887d {+21h 35m 33s} (J2000)
POINT_DEC:        +6.878d {+06d 52' 40"} (J2000)
IMG_START_DATE:  14049 TJD;   314 DOY;   06/11/10
IMG_START_TIME:  82167.75 SOD {22:49:27.75} UT,   3042.2 [sec] since BAT Trigger Time
COUNTS:          95    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        4    Max_iter_allowed= 4
ERROR_CODE:      2
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        Algorithm did not converge; too many interations.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 10 Nov 06 22:53:44 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     238174,   Seg_Num: 0
POINT_RA:        323.887d {+21h 35m 33s} (J2000)
POINT_DEC:        +6.878d {+06d 52' 40"} (J2000)
POINT_ROLL:      253.518d
IMG_START_DATE:  14049 TJD;   314 DOY;   06/11/10
IMG_START_TIME:  82171.45 SOD {22:49:31.45} UT,   3045.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.920
N_STARS:         47
X_OFFSET:        358 [pixels]
Y_OFFSET:        573 [pixels]
X_MAX:           1317 [pixels]
Y_MAX:           1532 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    12
SL_URL:          sw00238174000msufc3045.fits
SUN_POSTN:       225.94d {+15h 03m 46s}  -17.31d {-17d 18' 17"}
SUN_DIST:         99.68 [deg]   Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN:      121.15d {+08h 04m 35s}  +24.70d {+24d 42' 05"}
MOON_DIST:       141.35 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:       61.26,-31.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      328.62, 20.04 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 10 Nov 06 22:54:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     238174,   Seg_Num: 0
POINT_RA:        323.887d {+21h 35m 33s} (J2000)
POINT_DEC:        +6.878d {+06d 52' 40"} (J2000)
POINT_ROLL:      253.518d
IMG_START_DATE:  14049 TJD;   314 DOY;   06/11/10
IMG_START_TIME:  82171.45 SOD {22:49:31.45} UT,   3045.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.920
N_STARS:         47
X_OFFSET:        358 [pixels]
Y_OFFSET:        573 [pixels]
X_MAX:           1317 [pixels]
Y_MAX:           1532 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    12
SL_URL:          sw00238174000msufc3045.fits
SUN_POSTN:       225.94d {+15h 03m 46s}  -17.31d {-17d 18' 18"}
SUN_DIST:         99.68 [deg]   Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN:      121.15d {+08h 04m 36s}  +24.70d {+24d 42' 02"}
MOON_DIST:       141.36 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:       61.26,-31.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      328.62, 20.04 [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:     Fri 10 Nov 06 22:55:52 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     238174,   Seg_Num: 0
POINT_RA:        323.887d {+21h 35m 33s} (J2000)
POINT_DEC:        +6.878d {+06d 52' 40"} (J2000)
ROLL:            253.518d
IMG_START_DATE:  14049 TJD;   314 DOY;   06/11/10
IMG_START_TIME:  82171.45 SOD {22:49:31.45} UT,   3045.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     184891773
X_OFFSET:        677 [pixels]
Y_OFFSET:        892 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       837
Y_GRB_POS:       1052
BINNING_INDEX:   1
IM_URL:          sw00238174000msuni3045.fits
SUN_POSTN:       225.94d {+15h 03m 47s}  -17.31d {-17d 18' 19"}
SUN_DIST:         99.68 [deg]   Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN:      121.17d {+08h 04m 40s}  +24.70d {+24d 41' 48"}
MOON_DIST:       141.37 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:       61.26,-31.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      328.62, 20.04 [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:     Fri 10 Nov 06 22:56:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     238174,   Seg_Num: 0
POINT_RA:        323.887d {+21h 35m 33s} (J2000)
POINT_DEC:        +6.878d {+06d 52' 40"} (J2000)
ROLL:            253.518d
IMG_START_DATE:  14049 TJD;   314 DOY;   06/11/10
IMG_START_TIME:  82171.45 SOD {22:49:31.45} UT,   3045.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     184891773
X_OFFSET:        677 [pixels]
Y_OFFSET:        892 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       837
Y_GRB_POS:       1052
BINNING_INDEX:   1
IM_URL:          sw00238174000msuni3045.fits
SUN_POSTN:       225.95d {+15h 03m 47s}  -17.31d {-17d 18' 19"}
SUN_DIST:         99.68 [deg]   Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN:      121.17d {+08h 04m 41s}  +24.70d {+24d 41' 46"}
MOON_DIST:       141.37 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:       61.26,-31.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      328.62, 20.04 [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:        All 4 attachments are included.

GCN Circular #5803
P. Roming (PSU), F. Marshall (GSFC), M. Chester (PSU) report on behalf of the Swift UVOT team:
UVOT took a finding chart exposure of 131 seconds with the White (160-650 nm) filter starting 3046 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of the BAT error circle. The typical 3-sigma upper limit has been about 18.5 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.04.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 10 Nov 06 23:35:49 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     238174,   Seg_Num: 0
GRB_RA:          323.9182d {+21h 35m 40.3s} (J2000),
                 324.0034d {+21h 36m 00.8s} (current),
                 323.2973d {+21h 33m 11.3s} (1950)
GRB_DEC:          +6.8766d {+06d 52' 35.7"} (J2000),
                  +6.9075d {+06d 54' 26.9"} (current),
                  +6.6525d {+06d 39' 08.9"} (1950)
GRB_ERROR:       9.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       9.90e-13 [erg/cm2/sec]
GRB_SIGNIF:      2.50 [sigma]
IMG_START_DATE:  14049 TJD;   314 DOY;   06/11/10
IMG_START_TIME:  82167.75 SOD {22:49:27.75} UT,   3042.2 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       225.97d {+15h 03m 54s}  -17.31d {-17d 18' 47"}
SUN_DIST:         99.68 [deg]   Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN:      121.54d {+08h 06m 10s}  +24.61d {+24d 36' 23"}
MOON_DIST:       141.63 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:       61.28,-31.72 [deg] galactic lon,lat of the burst
ECL_COORDS:      328.65, 20.03 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values are not valid.   
COMMENTS:        POINT SOURCE IS FAINT

GCN Circular #5804
A.Melandri, C.G. Mundell, S. Kobayashi, C.J. Mottram, I.A. Steele, R.J. Smith, D. Carter, D. Bersier, M.F. Bode (Liverpool JMU) report:
The 2-m Liverpool Telescope robotically followed up GRB 061110B (Fox et al. GCN 5800, trigger=238174) beginning 20.0 min after the GRB trigger time (UT:22:18:45.51).
We find a fading source with R=19.5 +/- 0.3 mag (T+25 min) located at
```
RA = 21:35:40.4
Dec = +06:52:34.1 (0.5" uncertainty)
```
that we identify as the possible optical afterglow of GRB061110B. Magnitude was estimated with respect to USNO B1 catalog.
Further observations are on going.
GCN Circular #5805
J. A. Kennea, J. L. Racusin, D. N. Burrows and D. Grupe (PSU) report on behalf of the Swift/XRT team:
At 22:52UT the Swift/XRT began observing GRB 061110B (GCN 5800). In analysis of quicklook data we detect a faint uncatalogue point source at the following location:
```
RA(J2000):  21h 35m 40.4s
Dec(J2000): +6d 52m 36.0s
```
with an estimated uncertainty of 9.6 arcseconds radius (90% containment). This position lies 1.9 arcseconds from the Liverpool Telescope afterglow candidate (GCN 5804) and 62 arcseconds from the BAT position. It is not possible to determine at this time if this source is fading.
GCN Circular #5807
Christina C. Thoene, Daniele Malesani, Johan P. U. Fynbo (DARK Cosmology Centre), Christina Henriksen (DARK, NOT) and Dimitri Sharapov (NOT) report:
We observed the OT of GRB061110B (GCN 5804) starting Nov. 10, UT 23:20 (1h after the burst), with ALFOSC at the NOT on La Palma in R and i.
From two sets of 3x300s stacked images, we determined magnitudes of R=22.0 and i=21.5 using preliminary photometric zeropoints from the NOT webpages. Compared to the R-band magnitude reported in GCN 5804, the OT has faded with a temporal decay index of alpha~2.3.
GCN Circular #5808
H. Mikuz on behalf of PIKA observing program at Crni Vrh Observatory reports:
We imaged the field of GRB 061110B (SWIFT trigger 238174) with the 60 cm robotic telescope at Crni Vrh Observatory, Slovenia.
Due to the object low altitude (16 degrees) and presence of some cirrus clouds, only three 90 second exposures in R filter were secured, starting 44 s after the trigger was received. Exposure start times (in UT) are 22:09:46, 22:15:19 and 22:20:52.
No variable object was detected down to a limiting R magnitude 17.2 on single 90 s exposures, nor on three 90 s co-added exposures with R limiting magnitude 17.8. Magnitudes were estimated with the nearby USNO A2 stars.
GCN Circular #5809
J.P.U. Fynbo, D. Malesani, C.C. Thoene (NBI-DARK), P.M. Vreeswijk (ESO), J. Hjorth (NBI-DARK), C. Henriksen (NOT and DARK), report on behalf of a larger collaboration:
We observed the afterglow of GRB 061110B (Fox et al., GCN 5800, Melandri et al., GCN 5804) with the ESO-VLT UT2 equipped with FORS1. Observations started on 2006 Nov 11.018 UT (2.45 hr after the GRB), and two spectra lasting 30 minutes each were acquired with the grism 300V.
From the analysis of the first spectrum, we clearly see a strong DLA through at lambda ~ 5390 AA. From this feature, as well from OI+SiII, CII and SiIV, we measure a redshift of z = 3.44.
We acknowledge kind assistance from the ESO staff, in particular Stan Stefl and Chris Lidman.
GCN Circular #5810
M. Stamatikos (GSFC/ORAU), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), D. Fox (PSU), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), J. Tueller (GSFC) on behalf of the Swift-BAT team:
Using the data set from T-119 to T+183 sec from the recent telemetry downlink, we report further analysis of BAT GRB 061110B (trigger #238174) (Fox, et al., GCN Circ. 5800). The BAT ground-calculated position is RA,Dec = 323.916, 6.870 deg {21h 35m 39.8s, 6d 52' 12.2"} (J2000) +- 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted lightcurve has several peaks starting at ~T-18 sec out to ~T+38 sec. There is ongoing low-level emission out to at least T+172 sec at which time the spacecraft slewed to a planned target and the burst location slewed out of the BAT FOV. T90 (15-350 keV) is is at least 128 +- 5 sec (estimated error including systematics).
The time-averaged spectrum from T-16.5 to T+127.9 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.03 +- 0.16. The lower limit to the fluence in the 15-150 keV band is 1.3 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+3.26 sec in the 15-150 keV band is 0.4 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The GCN Notices for this burst were delayed (~10 min) because this trigger occurred during a Malindi downlink pass, during which the TDRSS data stream is buffered on-board the spacecraft.
GCN Circular #5811
D. Grupe, D.B. Fox, J. Racusin, J. Kennea, report on behalf of the Swift XRT team:
We have analyzed the first three orbits of Swift XRT data of GRB 061110B. The X-ray position was determined from the XRT image using the new teldef file:
```
Ra(2000)   =  21 35 40.42
Dec(2000)  = +06 52 34.0
```
with an 4.2" error (90% confidence). This position is 2" away from the initial position given by Kennea et al. (GCN 5805) and 0.1" away from the optical position reported by Melandri et al. (GCN 5804).
The X-ray light curve can be fitted by a single power law decay slope alpha=1.35+/0.10. The flux a 4ks after the burst was 2.4e-12 ergs/s/cm2. Our prediction for the flux at 24h after the burst is 4.5e-14 ergs/s/cm2, or 9e-4 XRT counts/s.
The spectral analysis shows a typical GRB afterglow spectrum with a power law photon index Gamma=1.9+/-0.4. The absorption column density in consistent with the Galactic value (4.83e21 cm-2).
GCN Circular #5814
P. Schady (UCL-MSSL), D.B. Fox (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began observing the field of GRB 061110b at 22:49:14 on 2006-11-10 UT, ~50 minutes after the BAT trigger (Fox et al., GCN 5800). No new source was detected within the XRT error circle (Grupe et al., GCN 5811) or at the afterglow position reported by Melandri et al. (GCN 5804) in coadded images in any filter down to the following 3-sigma magnitude upper limits:
```
Filter  T_mid (s)    Exp. (s) 3-sigma UL
------------------------------------------------
V       12256           1438    20.14
B       19296           2815    21.57
U       18864           2164    21.08
UVW1    18288           1928    20.58
UVM2    18192           1279    20.61
UVW2    13376           1737    20.99
White   15952           2494	21.03
------------------------------------------------
```
T_mid is the mid time of the coadded exposure with respect to the BAT trigger. These upper limits are not corrected for Galactic extinction E(B-V) = 0.04.
GCN Report 14.1
GCN_Report 14.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_14_1.pdf by D.B.Fox at PSU titled: "Swift Observations of GRB 061110B"
GCN Circular #5816
A. C. Updike, B. Donahue, S. D. Brittain, D. H. Hartmann, and A. L. Homewood (Clemson University) report on behalf of the Clemson GRB Follow-up team:
We observed GRB 061110B using the Kitt Peak 2.1m telescope and FLAMINGOS. Observations began in the J band 3 hours and 32 minutes after the burst trigger (238174), and consisted of 34 x 120s images.
We detect no new sources at the position noted by A. Melandri (GCN 5804) or within the XRT error box. Our limiting J-band magnitude (with respect to the 2MASS catalog) was 18.4 +/- .2 magnitudes.
The Clemson University GRB Response Site can be found at: http://people.clemson.edu/~kgarime/burst/index.php
This message may be cited.
GCN Circular #5899
F.E. Marshall (NASA/GSFC) reports on behalf of the Swift/UVOT team:
The exposure times for UVOT were reported incorrectly for GRB 061110B in GCN Circ. 5803 and for GRB 061121 in GCN Circ. 5823 because of a configuration problem in the instrument. The actual exposure times are close to the nominal values of 100 s and 400 s (Page et al., GCN Report 15.1) respectively.
We caution users of UVOT data that data in the archives for exposures taken between November 10 and November 22, 2006, have an incorrect value for the frame time. As a consequence, the standard UVOT analysis tools do not calculate dead time and anti-coincidence losses properly. Additional details, including the proper technique for analyzing these data, are available on the following web page:
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_frame.html

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Jochen Greiner, last update: 05-Dec-2006 [Disclaimer]