Gamma-ray Burst 031111

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Tue 11 Nov 03 16:45:21 UT
NOTICE_TYPE:    HETE S/C_Alert 
TRIGGER_NUM:    2924,   Seq_Num: 1
GRB_DATE:       12954 TJD;   315 DOY;   03/11/11
GRB_TIME:       60312.91 SOD {16:45:12.91} UT
TRIGGER_SOURCE: Trigger on the 25-400 keV band.
GAMMA_RATE:     109  [cnts/s]  on a 5.200 [sec] timescale
SC_LONG:        116 [deg East] 
SUN_POSTN:      226.42d {+15h 05m 41s}  -17.44d {-17d 26' 08"}
MOON_POSTN:      76.20d {+05h 04m 48s}  +25.28d {+25d 16' 43"}
MOON_ILLUM:     94 [%] 
COMMENTS:       No s/c ACS pointing info available yet.
COMMENTS:       Probable GRB.

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Tue 11 Nov 03 17:55:09 UT
NOTICE_TYPE:    HETE Ground Analysis
TRIGGER_NUM:    2924,   Seq_Num: 3
GRB_DATE:       12954 TJD;   315 DOY;   03/11/11
GRB_TIME:       60312.90 SOD {16:45:12.90} UT
TRIGGER_SOURCE: Trigger on the 25-400 keV band.
GAMMA_RATE:     109  [cnts/s]  on a 5.200 [sec] timescale
SC_-Z_RA:        28 [deg]
SC_-Z_DEC:       24 [deg]
SC_LONG:        116 [deg East] 
WXM_CNTR_RA:     72.434d {+04h 49m 44s} (J2000),
                 72.490d {+04h 49m 58s} (current),
                 71.710d {+04h 46m 50s} (1950)
WXM_CNTR_DEC:   +17.474d {+17d 28' 28"} (J2000),
                +17.481d {+17d 28' 51"} (current),
                +17.389d {+17d 23' 20"} (1950)
WXM_CORNER1:     73.9140  16.0620 [deg]
WXM_CORNER2:     70.8760  18.7719 [deg]
WXM_CORNER3:     70.9560  18.8900 [deg]
WXM_CORNER4:     73.9890  16.1740 [deg] 
WXM_MAX_SIZE:   239.62 [arcmin] diameter 
WXM_LOC_SN:     20 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 0.0 Y= 5.5 [sig/noise]
WXM_LC_SN:      X= 2.0 Y= 20.0 [sig/noise]
SUN_POSTN:      226.42d {+15h 05m 41s}  -17.44d {-17d 26' 08"}
SUN_DIST:       155.15 [deg]
MOON_POSTN:      76.20d {+05h 04m 48s}  +25.28d {+25d 16' 43"}
MOON_DIST:        8.53 [deg]
MOON_ILLUM:     94 [%]   
GAL_COORDS:     182.28,-17.04 [deg] galactic lon,lat of the burst
ECL_COORDS:     73.20,-4.95 [deg] ecliptic lon,lat of the burst
COMMENTS:       Definite GRB.
COMMENTS:       Burst_Validity flag is true.  
COMMENTS:       WXM data refined since S/C_Last Notice.

GCN notice #2443
K. Hurley and T. Cline, on behalf of the Ulysses and HETE GRB teams,
A. von Kienlin, G. Lichti, and A. Rau, on behalf of the INTEGRAL SPI-ACS GRB team, and
G. Ricker, J-L Atteia, N. Kawai, D. Lamb, S. Woosley, J. Doty, R. Vanderspek, J. Villasenor, G. Crew, G. Monnelly, N. Butler, J.G. Jernigan, A. Levine, F. Martel, E. Morgan, G. Prigozhin, J. Braga, R. Manchanda, G. Pizzichini, Y. Shirasaki, C. Graziani, M. Matsuoka, T. Tamagawa, K. Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Tavenner, T. Donaghy, M. Boer, J-F Olive, and J-P Dezalay, on behalf of the HETE GRB team, report:
Ulysses, INTEGRAL (SPI-ACS) and HETE (H2924: FREGATE and WXM) observed this burst at 60313 seconds. Its position was reported in a GCN Notice on November 11 at 17:55:09.
As observed by Ulysses, it had a duration of approximately 10 seconds, a 25-100 keV fluence of approximately 2.1E-06 erg/cm2, and a peak flux of approximately 1.1E-06 erg/cm2 s over 0.50 seconds. These numbers are subject to more than the usual amount of uncertainty, as the background on Ulysses was about 3 times the normal rate due to solar protons.
We have triangulated it to a preliminary annulus centered at RA, Decl(2000)= 351.380, -16.219 degrees, whose radius is 86.229 +/- 0.012 degrees (3 sigma). This intersects the WXM error box to form an error box whose coordinates are:
```
     RA(2000)     DEC(2000)
      71.830      17.934
      71.792      17.969
      71.736      18.204
      71.697      18.238
```
The combined WXM/IPN error box area is ~24 sq. arcmin., or ~75 times smaller than the WXM-only error box. A map has been posted at ssl.berkeley.edu/ipn3/031111. This error box may be improved.
GCN notice #2446
S. Fern=E1ndez-Acosta (IAC, Tenerife), S. Guziy, V. Casanova, A. de Ugarte, J. Gorosabel and A. J. Castro-Tirado (IAA-CSIC, Granada), report:
"We have obtained a mosaic of images (3 fields) covering the entire IPN error box for GRB 031111 (Hurley et al. GCN 2443) with the 0.8-m IAC80 telescope at Observatorio del Teide starting on Nov 13.07 UT (31.7-h after the GRB). None of the co-added images (4 x 600-s exposure time for each field) reveals any new (or strongly variable source) when comparing with the Digital Sky Survey (II epoch)".
GCN notice #2447
J. Silvey, D. Allen, R. Canterna (U. of Wyoming) and P.A. Price (IfA) report on behalf of the FUN GRB collaboration:
We observed the error box of GRB 031111 (Hurley et al., GCN #2443) with the RBO 0.6m telescope. Exposures consisted of 28 individual 300 sec exposures in I-band under cloudy conditions. Our images cover an estimated 98% of the error box at a mean epoch of 2003 Nov 13.2 UT (1.5 days after the GRB), down to an estimated limiting magnitude of R ~ 18.5 mag (on comparison with USNO-A2.0). We do not detect any optical afterglow candidate on visual comparison with the DSS 2 N plate.
No further observations of this GRB are planned.
This message may be cited.
GCN notice #2450
A. M. Soderberg and D. A. Frail (NRAO) report on behalf of a larger collaboration:
"Using the VLA at 4.9 GHz, we imaged the entire IPN error box (GCN#2443) of GRB 031111 (HETE Trigger 2924) on November 14.52 UT with the Very Large Array. The typical rms noise on the image was was 77 uJy. We detect no sources greater than 5 sigma inside the error region. No further observations are planned."
GCN notice #2456
Martin Jelinek, Petr Kubanek, Martin Nekola, Rene Hudec & BART team, Astronomical Institute Ondrejov, report:
Robotic system BART (Ondrejov Observatory) observed the error box of GRB031111A (HETE 2924) using its two WF cameras only 30s after receiving the coordinates. Overall time since GRB was 70 minutes. Most of the obtained images were overexposed due to nearby moon, but at images taken at 2003 Nov 11, 3h20, 3h56, 4h02, 4h08 and 4h14 after burst, no new object in comparison with GSC was identified; we estimate the limiting magnitude I about 13 within the combined HETE/IPN error box (cf. GCN 2443).
The corresponding image is posted at http://lascaux.asu.cas.cz/~mates/031111A.jpg
GCN notice #2524
A.Piccioni, C.Bartolini, A.Guarnieri (Bologna University), P.Ferrero and G.Pizzichini,(IASF-CNR, Sezione di Bologna) and J. Casares (IAC, Tenerife) report:
During the nights Nov 13, 14 and 15, 2003 we observed the error box of GRB031111 (Hete burst H2925, Hurley et al., GCN #2443) in R band with the 1m ESA OGS telescope (operated on the island of Tenerife by Instituto de Astrofisica de Canarias at the Observatorio del Teide), and the IAC CCD camera.
The initial HETE-WXM field was divided in 9 overlapping subfields. With the exception of about 7% of the area at the corners, the full final HETE-IPN error box was observed. The images intersecting the error box were selected, and we obtained:
```
 13 images x 600 sec on Nov. 13.14 UT (mean epoch)  
 12 images x 600 sec on Nov. 14.16 UT (mean epoch)
  5 images x 600 sec on Nov. 15.04 UT (mean epoch)
```
Our coadded images of subsequent nights attained just the limit of POSS-II, and by comparison we can state that no new object is present. Within the same limit and on a time scale of 3 days we do not detect any variable object with amplitude > 0.3 mag. A few selected images, the observation log and a short comment are available in our public account; the coordinates to login (only by ssh or sftp) are:
```
        hostname  ermione.bo.astro.it
        username  publicGRB
        password  GRB_bo
        directory GRB031111
```
This message may be cited.

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Jochen Greiner, last update: 03-Feb-2004 [Disclaimer]