Gamma-ray Burst 100526B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 26 May 10 19:02:11 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     423184,   Seg_Num: 0
GRB_RA:            0.700d {+00h 02m 48s} (J2000),
                   0.832d {+00h 03m 20s} (current),
                   0.061d {+00h 00m 15s} (1950)
GRB_DEC:         -37.902d {-37d 54' 07"} (J2000),
                 -37.844d {-37d 50' 39"} (current),
                 -38.181d {-38d 10' 50"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       96589 [cnts]    Image_Peak=903 [image_cnts]
TRIGGER_DUR:     26.880 [sec] 
TRIGGER_INDEX:   463     E_range: 15-50 keV
BKG_INTEN:       218148 [cnts]
BKG_TIME:        68330.16 SOD {18:58:50.16} UT
BKG_DUR:         64 [sec]
GRB_DATE:        15342 TJD;   146 DOY;   10/05/26
GRB_TIME:        68438.51 SOD {19:00:38.51} UT
GRB_PHI:         123.58 [deg]
GRB_THETA:        10.35 [deg]
SOLN_STATUS:     0x83
RATE_SIGNIF:     6.92 [sigma]
IMAGE_SIGNIF:    6.89 [sigma]
MERIT_PARAMS:     +1  +0  +0  +5  +1  -3  +0  +0 -11  +0 
SUN_POSTN:        63.50d {+04h 14m 01s}  +21.20d {+21d 12' 18"}
SUN_DIST:         83.33 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      227.28d {+15h 09m 07s}  -21.80d {-21d 48' 16"}
MOON_DIST:       106.10 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      343.37,-75.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      343.38,-34.57 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 256.35,18.92 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 26 May 10 19:04:53 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     423184,   Seg_Num: 0
GRB_RA:            0.700d {+00h 02m 48s} (J2000),
                   0.832d {+00h 03m 20s} (current),
                   0.061d {+00h 00m 15s} (1950)
GRB_DEC:         -37.902d {-37d 54' 07"} (J2000),
                 -37.844d {-37d 50' 39"} (current),
                 -38.181d {-38d 10' 50"} (1950)
GRB_DATE:        15342 TJD;   146 DOY;   10/05/26
GRB_TIME:        68438.51 SOD {19:00:38.51} UT
TRIGGER_INDEX:   463
GRB_PHI:         123.58 [deg]
GRB_THETA:        10.35 [deg]
DELTA_TIME:      44.00 [sec]
TRIGGER_DUR:     26.880 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     6.92 [sigma]
IMAGE_SIGNIF:    6.89 [sigma]
LC_URL:          sw00423184000msb.lc
SUN_POSTN:        63.50d {+04h 14m 01s}  +21.21d {+21d 12' 19"}
SUN_DIST:         83.33 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      227.31d {+15h 09m 13s}  -21.81d {-21d 48' 36"}
MOON_DIST:       106.08 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      343.37,-75.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      343.38,-34.57 [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 = 256.35,18.92 [deg].

GCN Circular #10799
M. H. Siegel (PSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), D. Grupe (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), D. M. Palmer (LANL), T. A. Pritchard (PSU), P. Romano (INAF-IASFPA), T. Sakamoto (NASA/UMBC), M. A. Stark (PSU), E. Troja (NASA/GSFC/ORAU) and L. Vetere (PSU) report on behalf of the Swift Team:
At 19:00:38 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100526B (trigger=423184). The slew was delayed due to an observing constraint. The BAT on-board calculated location is RA, Dec 0.700, -37.902 which is
```
   RA(J2000)  =  00h 02m 48s
   Dec(J2000) = -37d 54' 07"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a few weak peaks with a duration of about ~30 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~3 sec after the trigger.
Due to an observing constraint, Swift will not slew until T0+54 minutes. There will be no XRT or UVOT data until this time.
Burst Advocate for this burst is M. H. Siegel (siegel AT astro.psu.edu). 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:     Wed 26 May 10 19:55:34 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     423184,   Seg_Num: 0
POINT_RA:          0.683d {+00h 02m 44s} (J2000)
POINT_DEC:       -37.911d {-37d 54' 40"} (J2000)
IMG_START_DATE:  15342 TJD;   146 DOY;   10/05/26
IMG_START_TIME:  71721.07 SOD {19:55:21.07} UT,   3282.6 [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:     Wed 26 May 10 19:58:18 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     423184,   Seg_Num: 0
POINT_RA:          0.683d {+00h 02m 44s} (J2000)
POINT_DEC:       -37.911d {-37d 54' 39"} (J2000)
POINT_ROLL:      56.615d
IMG_START_DATE:  15342 TJD;   146 DOY;   10/05/26
IMG_START_TIME:  71726.66 SOD {19:55:26.66} UT,   3288.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.131
N_STARS:         110
X_OFFSET:        593 [pixels]
Y_OFFSET:        486 [pixels]
X_MAX:           1552 [pixels]
Y_MAX:           1445 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00423184000msufc3288.fits
SUN_POSTN:        63.54d {+04h 14m 10s}  +21.21d {+21d 12' 42"}
SUN_DIST:         83.38 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      227.83d {+15h 11m 20s}  -21.92d {-21d 54' 58"}
MOON_DIST:       105.69 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      343.38,-75.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      343.36,-34.57 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 26 May 10 19:58:18 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     423184,   Seg_Num: 0
POINT_RA:          0.683d {+00h 02m 44s} (J2000)
POINT_DEC:       -37.911d {-37d 54' 39"} (J2000)
POINT_ROLL:      56.615d
IMG_START_DATE:  15342 TJD;   146 DOY;   10/05/26
IMG_START_TIME:  71726.66 SOD {19:55:26.66} UT,   3288.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.131
N_STARS:         110
X_OFFSET:        593 [pixels]
Y_OFFSET:        486 [pixels]
X_MAX:           1552 [pixels]
Y_MAX:           1445 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00423184000msufc3288.fits
SUN_POSTN:        63.54d {+04h 14m 10s}  +21.21d {+21d 12' 42"}
SUN_DIST:         83.38 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      227.83d {+15h 11m 20s}  -21.92d {-21d 54' 58"}
MOON_DIST:       105.69 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      343.38,-75.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      343.36,-34.57 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 26 May 10 19:58:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     423184,   Seg_Num: 0
POINT_RA:          0.683d {+00h 02m 44s} (J2000)
POINT_DEC:       -37.911d {-37d 54' 39"} (J2000)
POINT_ROLL:      56.615d
IMG_START_DATE:  15342 TJD;   146 DOY;   10/05/26
IMG_START_TIME:  71726.66 SOD {19:55:26.66} UT,   3288.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.131
N_STARS:         110
X_OFFSET:        593 [pixels]
Y_OFFSET:        486 [pixels]
X_MAX:           1552 [pixels]
Y_MAX:           1445 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00423184000msufc3288.fits
SUN_POSTN:        63.54d {+04h 14m 10s}  +21.21d {+21d 12' 42"}
SUN_DIST:         83.38 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      227.84d {+15h 11m 21s}  -21.92d {-21d 55' 01"}
MOON_DIST:       105.68 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      343.38,-75.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      343.36,-34.57 [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:     Wed 26 May 10 19:59:44 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     423184,   Seg_Num: 0
POINT_RA:          0.683d {+00h 02m 44s} (J2000)
POINT_DEC:       -37.911d {-37d 54' 39"} (J2000)
ROLL:            56.615d
IMG_START_DATE:  15342 TJD;   146 DOY;   10/05/26
IMG_START_TIME:  71726.66 SOD {19:55:26.66} UT,   3288.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     296596532
X_OFFSET:        912 [pixels]
Y_OFFSET:        805 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1072
Y_GRB_POS:       965
BINNING_INDEX:   1
IM_URL:          sw00423184000msuni3294.fits
SUN_POSTN:        63.54d {+04h 14m 10s}  +21.21d {+21d 12' 42"}
SUN_DIST:         83.38 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      227.85d {+15h 11m 23s}  -21.92d {-21d 55' 08"}
MOON_DIST:       105.68 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      343.38,-75.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      343.36,-34.57 [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:     Wed 26 May 10 20:00:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     423184,   Seg_Num: 0
POINT_RA:          0.683d {+00h 02m 44s} (J2000)
POINT_DEC:       -37.911d {-37d 54' 39"} (J2000)
ROLL:            56.615d
IMG_START_DATE:  15342 TJD;   146 DOY;   10/05/26
IMG_START_TIME:  71726.66 SOD {19:55:26.66} UT,   3288.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     296596532
X_OFFSET:        912 [pixels]
Y_OFFSET:        805 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1072
Y_GRB_POS:       965
BINNING_INDEX:   1
IM_URL:          sw00423184000msuni3294.fits
SUN_POSTN:        63.54d {+04h 14m 10s}  +21.21d {+21d 12' 42"}
SUN_DIST:         83.38 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      227.85d {+15h 11m 24s}  -21.92d {-21d 55' 10"}
MOON_DIST:       105.68 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      343.38,-75.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      343.36,-34.57 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 26 May 10 20:22:27 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     423184,   Seg_Num: 0
GRB_RA:            0.7355d {+00h 02m 56.52s} (J2000),
                   0.8681d {+00h 03m 28.34s} (current),
                   0.0966d {+00h 00m 23.17s} (1950)
GRB_DEC:         -37.9119d {-37d 54' 42.8"} (J2000),
                 -37.8540d {-37d 51' 14.4"} (current),
                 -38.1903d {-38d 11' 25.0"} (1950)
GRB_ERROR:       5.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15342 TJD;   146 DOY;   10/05/26
IMG_START_TIME:  71732.00 SOD {19:55:32.00} UT,   3293.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        63.56d {+04h 14m 14s}  +21.21d {+21d 12' 52"}
SUN_DIST:         83.36 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      228.07d {+15h 12m 17s}  -21.96d {-21d 57' 48"}
MOON_DIST:       105.55 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      343.27,-75.17 [deg] galactic lon,lat of the burst
ECL_COORDS:      343.40,-34.60 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 10% < P(seren) < 15%.

GCN Circular #10802
J. A. Kennea, L. Vetere and M. Siegel (PSU) report on behalf of the Swift team:
The XRT began observing the field of GRB 100526B at 19:55:21.1 UT, 3282.6 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 0.73552, -37.91195 which is equivalent to:
```
   RA(J2000)  = 00h 02m 56.52s
   Dec(J2000) = -37d 54' 43.0"
```
with an uncertainty of 5.6 arcseconds (radius, 90% containment). This location is 107 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.12e+20 cm^-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 3288 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT 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 0.01.
GCN Circular #10803
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. H. Siegel (PSU), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 100526B (trigger #423184) (Siegel, et al., GCN Circ. 10799). The BAT ground-calculated position is RA, Dec = 0.777, -37.913 deg, which is
```
   RA(J2000)  =  00h 03m 06.5s 
   Dec(J2000) = -37d 54' 48.4" 
```
with an uncertainty of 3.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 95%.
The mask-weighted light curve shows a broad weak peak starting at ~T-25 sec, peaking around T+10 sec, and ending around t+50 sec. The burst location went out of the BAT FOV at T+240 sec when Swift was forced to slew due to an observing constraint. T90 (15-350 keV) is 64.0 +- 22.6 sec (estimated error including systematics).
The time-averaged spectrum from T-28.4 to T+35.6 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.47 +- 0.28. The fluence in the 15-150 keV band is 4.7 +- 0.9 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+11.15 sec in the 15-150 keV band is 0.1 +- 0.1 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/423184/BA/
GCN Circular #10808
T. A. Pritchard (PSU) and Siegel (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 100526B 3288 s after the BAT trigger (Siegel et al., GCN Circ. 10799). No optical afterglow consistent with the XRT position (Kennea et al., GCN Circ. 10802) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag
--------------------------------------------------------------
white (FC)        3288         3438          147         >21.3
white             3288         4669          344         >21.7
v                 3445         5080          393         >20.2
b                 4265         5880          372         >20.7
u                 4060         5695          393         >20.5
w1                3855         5491          393         >20.7
m2                3650         3849          197         >19.9
w2                4675         4875          197         >20.3
```
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #10809
L. Vetere and M. H. Siegel (PSU) report on behalf of the Swift-XRT team:
We have now collected 5.7 ks of Swift-XRT Photon Counting mode data on the GRB 100526B (Siegel et al. GCN Circ. 10799), from 3289 s to 34.8 ks after the BAT trigger.
The source reported by Kennea et al. (GCN Circ. 10802) is now only marginally detected, with a count rate of 1.5x10^-3 count s^-1 (corresponding to an observed flux of 7.1x10^-14 erg cm^-2 s^-1).
With this fading, we can confirm that this source is the X-ray afterglow of GRB 100526B.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00423184.
This circular is an official product of the Swift-XRT team.
GCN Circular #10812
GRB 100526B: GROND Upper limits
P. Afonso (MPE), A. Nicuesa (Tautenburg Obs.), R. Filgas and J. Greiner (all MPE Garching), report on behalf of the GROND team:
We observed the field of GRB 100526B (Swift trigger #423184 ; Siegel et al., GCN #10799) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPI/ESO telescope at La Silla Observatory (Chile).
Observations started at 09:37 UT on March 27, 14.6 hours after the GRB trigger, and were performed under strong wind.
We do not detect a source within the Swift-XRT error circle reported by Kennea et al. (GCN #10802) in any of the GROND filters. Stacked images with a total integration time of 28 minutes in JHK and 32 minutes in g'r'i'z' yield the following preliminary 3-sigma upper limits:
```
g' > 24.1
r' > 24.2
i' > 23.9
z' > 23.8
J  > 22.7
H  > 22.2
K  > 21.3
```
All magnitudes given above are in the AB system and are based on the GROND zeropoints and 2MASS field stars. No correction has been applied for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.012 in the direction of the burst (Schlegel et al. 1998).
GCN Report 281.1
GCN_Report 281.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_281_1.pdf by M.H. Siegel at PSU titled: "Final Report on Swift Observations of GRB 100526B"

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Jochen Greiner, last update: 26-May-2010 [Disclaimer]