GRB111022B

This page lists all entries on GRB111022B in GRBweb

Summary IPN Swift GCN 12472 GCN 12475 GCN 12478 GCN 12479 GCN 12480 GCN 12481 GCN 12484 GCN 12485 GCN 12488 GCN 12491 GCN 12493 GCN 12494 GCN 12495 GCN 12496 GCN 12521 GCN 12619

Summary table
Variable Value Source
T0 17:13:04 UTC GCN_circulars,Swift Det
ra 108.9647° Swift
decl 49.6836° Swift
pos_error 1.94e-04° Swift
T90 79.1 s Swift
T90_start 17:13:04 UTC Swift
fluence 9.00e-07 erg/cm² Swift
T100 79.1 s
GBM_located False
mjd 55856.71740740741 GCN_circulars,Swift Det
IPN table
GRB_name GRB111022B
ra 108.9500°
decl 49.6667°
pos_error 5.00e-02°
Swift table
GRB_name GRB111022B
t_trigger 17:13:04 UTC
ra 108.9647°
decl 49.6836°
pos_error 1.94e-04°
T90 79.1 s
fluence 9.00e-07 erg/cm²
GCN 12472 table
GRB_name GRB111022B
GCN_number 12472
Detection_method Swift Det
t_trigger 17:13:04 UTC
ra 108.9510°
decl 49.6660°
Circular_text TITLE: GCN CIRCULAR NUMBER: 12472 SUBJECT: GRB 111022B: Swift detection of a burst DATE: 11/10/22 17:31:34 GMT FROM: Scott Barthelmy at NASA/GSFC S. T. Holland (CRESST/USRA/GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), M. M. Chester (PSU), V. D'Elia (ASDC), N. Gehrels (NASA/GSFC), C. Guidorzi (U Ferrara), J. A. Kennea (PSU), C. B. Markwardt (NASA/GSFC), A. Melandri (INAF-OAB), K. L. Page (U Leicester) and G. Stratta (ASDC) report on behalf of the Swift Team: At 17:13:04 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 111022B (trigger=506074). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 108.951, +49.666 which is RA(J2000) = 07h 15m 48s Dec(J2000) = +49d 39' 59" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows nothing which is typical for an image trigger. The XRT began observing the field at 17:15:21.8 UT, 137.3 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 108.9646, 49.6835 which is equivalent to: RA(J2000) = 07h 15m 51.49s Dec(J2000) = +49d 41' 00.4" with an uncertainty of 2.5 arcseconds (radius, 90% containment). This location is 69 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. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 7.32 x 10^20 cm^-2 (Kalberla et al. 2005). The initial flux in the 2.5 s image was 8.17e-10 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 150 seconds with the White filter starting 144 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 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. 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 0.07. Burst Advocate for this burst is S. T. Holland (Stephen.T.Holland AT nasa.gov). 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 12475 table
GRB_name GRB111022B
GCN_number 12475
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 12475 SUBJECT: GRB 111022B: MASTER-Net early limit DATE: 11/10/22 18:07:27 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, D.Kuvshinov, N.Tyurina, N.Shatskiy, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, A.Sankovich Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V. Senik Kislovodsk Solar Station of the Pulkovo Observatory K.Ivanov, S.Yazev, N.M.Budnev, E.Konstantinov, V.Lenok, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB111022B 22 sec after notice time and 583 sec after GRB time at 2011-10-22 17:22:48 UT in two polarization bands. On our first (120s exposure) set we haven't found optical transient within SWIFT error-box. The 5-sigma upper limit has been about 17.0 mag MASTER II robotic telescope located in Tunka(Siberia) was pointed to GRB111022B 183 sec after notice time and 748 sec after GRB time at 2011-10-22 17:25:32 UT in two polarization bands. On our first (150s exposure) set we haven't found optical transient within SWIFT error-box. So long time of pointing in this site is caused by a mount problem. The 5-sigma upper limit has been about 18.3 mag The message may be cited.
GCN 12478 table
GRB_name GRB111022B
GCN_number 12478
Detection_method Swift-XRT Det
ra 108.9650°
decl 49.6836°
Circular_text TITLE: GCN CIRCULAR NUMBER: 12478 SUBJECT: GRB 111022B: Enhanced Swift-XRT position DATE: 11/10/22 21:50:44 GMT FROM: Phil Evans at U of Leicester A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team. Using 885 s of XRT Photon Counting mode data and 1 UVOT images for GRB 111022B, 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 = 108.96498, +49.68362 which is equivalent to: RA (J2000): 07h 15m 51.59s Dec (J2000): +49d 41' 01.0" with an uncertainty of 1.8 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) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 12479 table
GRB_name GRB111022B
GCN_number 12479
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 12479 SUBJECT: GRB 111022B: NOT observations DATE: 11/10/23 04:42:13 GMT FROM: Paul Vreeswijk at U of Iceland Paul Vreeswijk, Annalisa De Cia (U. Iceland), Dong Xu (WIS), Daniele Malesani (DARK), Pll Jakobsson (U. Iceland) report on behalf of a larger collaboration: Using ALFOSC on the Nordic Optical Telescope (NOT) we have obtained R (3 x 300 s) and I-band (5 x 400 s) imaging of the field of the Swift GRB 111022B (Holland et al., GCN 12472), starting on 2011 October 23.097 UT (roughly 9.3 hours after the burst). The seeing during the observations was around 1". We do not detect any object within the enhanced XRT error circle (Beardmore et al., GCN 12478), down to limiting magnitudes of about R>23.2 and I>21.9 (calibrated against the USNO-B1 catalog). We are grateful to the NOT observer, Terese Hansen (U. Copenhagen), for obtaining these observations.
GCN 12480 table
GRB_name GRB111022B
GCN_number 12480
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 12480 SUBJECT: GRB 111022B: MITSuME Akeno Optical upper limits DATE: 11/10/23 07:51:48 GMT FROM: Yoichi Yatsu at Tokyo Tech. Y. Aoki, R. Usui, K. Tokoyoda, Y. Yatsu, K. Kawakami, M. Hayashi, S. Song, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed GRB 111022B (S.T. Holland et al, GCN12472) with the optical three color (g, Rc, and Ic) CCD camera attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The follow-up observation was started at 18:09:58, ~ 57 min after the BAT trigger because of bad weather. We did not find any new point source within the enhanced XRT error circle (A.P. Beardmore et al, GCN12478) in three bands. Photometric results and are listed below. We used GSC2.3 catalog for flux calibration. T0+[s] MID-UT T-EXP[sec] g' Rc Ic --------------------------------------------------------------------------------- +7317 19:54:13 540 >17.8 >17.7 --- +10426 20:12:52 360 --- --- >16.5 --------------------------------------------------------------------------------- T0+ : Elapsed time after the burst [sec] T-EXP: Total Exposure time [sec]
GCN 12481 table
GRB_name GRB111022B
GCN_number 12481
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 12481 SUBJECT: GRB 111022B: Gemini infrared observations DATE: 11/10/23 13:19:30 GMT FROM: Andrew Levan at U.of Leicester A.J. Levan (U. Warwick), D. Fox (PSU), N.R. Tanvir (U. Leicester) report for a larger collaboration: "We observed the localization of GRB 111022B (Holland et al. GCN 12472) with the Gemini-North telescope, equipped with NIRI. Observations were obtained in poor conditions (2.5" seeing) and began 17 hours after the burst in the YJHK filters. We find a single source within the refined XRT error circle (Beardmore et al. GCN 12478). The source is well detected in both H and K, with K~19.0 +/- 0.2, but only very weakly in J. Given the earlier non-detections in the optical (Vreeswijk et al. GCN 12479) the inferred optical-IR colour is red (R-K > 4.2), coupled with the lack of apparent excess N_H this could be indicative of a high redshift burst. Analysis is ongoing, and further observations are planned."
GCN 12484 table
GRB_name GRB111022B
GCN_number 12484
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 12484 SUBJECT: GRB 111022B: Swift-XRT refined Analysis DATE: 11/10/23 15:38:04 GMT FROM: Valerio D'Elia at ASDC V. D'Elia, G. Stratta (ASDC), S. T. Holland (CRESST/USRA/GSFC) report on behalf of the Swift-XRT team: We have analysed 8.5 ks of XRT data for GRB 111022B (Holland et al. GCN Circ. 12472), from 127 s to 18.5 ks after the BAT trigger. The data comprise 134 s in Windowed Timing (WT) mode (the first 8 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 12478). The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=1.7 (+/-0.9). At T+176 s the decay steepens to an alpha of 3.64 (+0.26, -0.22) before breaking again at T+404 s to a final decay with index alpha=2.05 (+0.26, -0.21). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.41 (+0.14, -0.13). The best-fitting absorption column is 1.46 (+0.27, -0.26) x 10^21 cm^-2, in excess of the Galactic value of 7.3 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.59 (+0.15, -0.12) and a best-fitting absorption column consistent with the Galactic value. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.5 x 10^-11 (5.0 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 0 (+2.7, -0) x 10^20 cm^-2 Galactic foreground: 7.3 x 10^20 cm^-2 Excess significance: <1.6 sigma Photon index: 1.59 (+0.15, -0.12) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00506074. This circular is an official product of the Swift-XRT team.
GCN 12485 table
GRB_name GRB111022B
GCN_number 12485
Detection_method Swift-BAT Det
ra 108.9270°
decl 49.6630°
Circular_text TITLE: GCN CIRCULAR NUMBER: 12485 SUBJECT: GRB 111022B, Swift-BAT refined analysis DATE: 11/10/23 18:40:50 GMT FROM: Tilan Ukwatta at GSFC/GWU C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), S. T. Holland (CRESST/USRA/GSFC), H. A. Krimm (GSFC/USRA), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 111022B (trigger #506074) (Holland, et al., GCN Circ. 12472). The BAT ground-calculated position is RA, Dec = 108.927, 49.663 deg which is RA(J2000) = 07h 15m 42.4s Dec(J2000) = +49d 39' 45.9" with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 82%. The mask-weighted light curve shows a multi-peak structure starting at ~T-50 sec and ending at ~T+60 sec. T90 (15-350 keV) is 79.1 +/- 13.5 sec (estimated error including systematics). The time-averaged spectrum from T-47.84 to T+53.80 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.59 +/- 0.20. The fluence in the 15-150 keV band is 9.0 +/- 1.2 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+49.54 sec in the 15-150 keV band is 0.4 +/- 0.3 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/506074/BA/
GCN 12488 table
GRB_name GRB111022B
GCN_number 12488
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 12488 SUBJECT: GRB 111022B: Swift/UVOT upper limits DATE: 11/10/23 21:29:31 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin (MSSL-UCL) and S. T. Holland (CRESST/USRA/GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 111022B 145 s after the BAT trigger (Holland et al., GCN Circ. 12472). The upper limit of detection was determined at the enhanced XRT position (Beardmore et al., GCN 12478). Preliminary 3-sigma upper limits in 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 145 294 147 >20.8 u_FC 303 552 246 >20.0 v 635 6091 452 >19.8 b 559 6912 452 >20.3 u 302 6707 678 >20.4 uvw1 685 6501 432 >20.3 uvm2 659 6296 452 >20.3 uvw2 608 5886 255 >20.1 white 145 6975 606 >21.3 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.07 in the direction of the burst (Schlegel et al. 1998).
GCN 12491 table
GRB_name GRB111022B
GCN_number 12491
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 12491 SUBJECT: GRB 111022B: BTA Optical Observations DATE: 11/10/24 19:37:43 GMT FROM: Vladimir Sokolov at SAO RAS A. S. Moskvitin, V. N. Komarova, V. V. Sokolov and T. N. Sokolova (SAO RAS GRB follow-up team) report: The field of GRB 111022B (Holland et al., GCN#12472) was observed with the 6-m BTA/Scorpio on October, 23, 2011. We obtained 3 x 180 sec. frames in the Rc band and 25 x 120 sec. in the Ic band. Observations in Rc began at 00:40:10 (7.5 hours after the trigger), ended at 00:50:21 UT; in Ic began at 01:23:11 UT (8.2 hours after the trigger), ended at 02:22:40 UT. Conditions were clear with a seeing of about 1".2 (FWHM of stellar objects in the Ic co-added image). The possible optical counterpart is clearly detected in the Ic band within the 1".5 XRT error circle (according to http://www.swift.ac.uk/xrt_positions/) at the coordinates: R.A. (J2000) = 07:15:51.56 Decl. (J2000) = +49:41:01.7 with the uncertainty 0".2. The object magnitude is I = 23.6 +/- 0.3 as compared to USNO-B1.0 Imag of six nearby stars. The high error is due to calibration, the 3-sigma limit of the Ic co-added image is about 24.7. We do not detect the object in the Rc-band down to the 3-sigma level limiting magnitude of about 24.3. The Ic image can be found at ftp://ftp.sao.ru/pub/grb/GRB111022B/GRB111022B_BTA.jpg Our results are in agreement with the previously reported NOT observations (Vreeswijk et al., GCN#12479) and do not contradict the idea of a high redshift burst according to Gemini infrared observations (Levan et al., GCN#12481). We are grateful to T. A. Fatkhullin and the BTA staff for the help in observations.
GCN 12493 table
GRB_name GRB111022B
GCN_number 12493
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 12493 SUBJECT: GRB111022B: D50 optical limit DATE: 11/10/25 02:58:35 GMT FROM: Martin Jelinek at Inst.Astrophys.Andalucia,Granada M. Blazek (AsU AV), R. Hudec (AsU AV), M. Jelinek (IAA-CSIC), C. Polasek (AsU AV) and J. Strobl (AsU AV) "We observed the field of GRB 111022B (Holland et al., GCN 12472) with 0.5m robotic telescope D50 in Ondrejov observatory (Czech Republic). The observation started at 23:55:06 UT on October 22, 2011, approx. 6.5 hours after the Swift trigger. We report no detection of the optical counterpart on the unfiltered images within the error circle given by SWIFT-XRT (Beardmore et al., GCN 12478). The limiting magnitude of about R>20.0 mag in R-band was estimated using nearby sources from GSC2.2 catalogue."
GCN 12494 table
GRB_name GRB111022B
GCN_number 12494
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 12494 SUBJECT: GRB 111022B: 10.4m GTC z'-band observations DATE: 11/10/25 10:15:40 GMT FROM: Javier Gorosabel at IAA-CSIC J. Gorosabel (IAA-CSIC), A. Cabrera Lavers (GTC), R. Sanchez-Ramirez (IAA-CSIC), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), A.J. Levan (U. Warwick), C.C. Thoene (IAA-CSIC), N.R. Tanvir (U. Leicester), A.J. Castro-Tirado (IAA-CSIC), P. Kubanek (IAA-CSIC, U. Valencia), report on behalf of a larger collaboration: We acquired z'-band images of the GRB 111022B field (Holland et al., GCNC 12472; Beardmore et al., GCNC 12478) with the 10.4m GTC(+OSIRIS) telescope. The observations were carried out on Oct 24.1105--24.1453 UT (33.4--34.3 hours post GRB) with a total exposure time of 31x60s=1860s and a seeing of 1.0-1.5". A faint object is detected coincident with the near-IR and optical candidate (Levan et al. GCNC 12481; Moskvitin et al. GCNC 12491). This source has a very preliminary AB magnitude of z'~25.5. In the XRT error circle (Beardmore et al., GCNC 12478) we note the presence of an additional object with a similar magnitude located 1.5" eastwards from the afterglow candidate.
GCN 12495 table
GRB_name GRB111022B
GCN_number 12495
Detection_method VLA Det
ra 108.9647°
decl 9.6837°
Circular_text TITLE: GCN CIRCULAR NUMBER: 12495 SUBJECT: GRB 111022B: EVLA observations DATE: 11/10/26 03:49:15 GMT FROM: Ashley Zauderer at CfA A. Zauderer and E. Berger (Harvard) report: "We observed the position of GRB 111022B (GCN 12472) with the EVLA at 5.8 and 22 GHz beginning on 2011 Oct 23.64 UT (0.92 days after the burst). No radio source is detected at 5.8 GHz to a 3-sigma upper limit of 30 uJy. At 22 GHz, a potential radio counterpart was detected with a flux of 45+/-14 uJy, consistent with the most up-to-date 1.5'' Swift-XRT position (GCN 12478, http://www.swift.ac.uk/xrt_positions). The potential radio source centroid is (J2000): RA = 07:15:51.53 +/- 0.05 Dec = 09:41:01.18 +/- 0.37 Follow-up observations at 22 GHz are planned."
GCN 12496 table
GRB_name GRB111022B
GCN_number 12496
Detection_method correction
ra 108.9647°
decl 49.6837°
Circular_text TITLE: GCN CIRCULAR NUMBER: 12496 SUBJECT: GRB 111022B: EVLA observations - correction to GCN 12495 DATE: 11/10/26 04:35:32 GMT FROM: Ashley Zauderer at CfA A. Zauderer and E. Berger (Harvard) report: The declination given in GCN 12495 was incorrect. "We observed the position of GRB 111022B (GCN 12472) with the EVLA at 5.8 and 22 GHz beginning on 2011 Oct 23.64 UT (0.92 days after the burst). No radio source is detected at 5.8 GHz to a 3-sigma upper limit of 30 uJy. At 22 GHz, a potential radio counterpart was detected with a flux of 45+/-14 uJy, consistent with the most up-to-date 1.5'' Swift-XRT position (GCN 12478, http://www.swift.ac.uk/xrt_positions). The potential radio source centroid is (J2000): RA = 07:15:51.53 +/- 0.05 Dec = +49:41:01.18 +/- 0.37 Follow-up observations at 22 GHz are planned."
GCN 12521 table
GRB_name GRB111022B
GCN_number 12521
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 12521 SUBJECT: GRB 111022B: MASTER OT observations DATE: 11/11/03 11:46:35 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs A.V. Parhomenko, A. Tlatov, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory K.Ivanov, V.A.Poleshchuk, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev,E.Konstantinov, Irkutsk State University E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov,A.Sankovich Sternberg Astronomical Institute, Moscow State University V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka(Siberia) was pointed to the GRB110801A 101 sec after GRB time at 2011-08-01 19:51:23 UT. Unfortunatelly the objects was not in focus because recently photometer modification. On our first (20s exposure) set we haven't found optical transient within SWIFT error-box (De Pasquale et al., GCN 12228). The 3-sigma upper limit has been about 14.0 mag (white+polarizator). MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located near Kislovodsk (Caucasus Mountains) closed roof 20 min before trigger due to cloudy condidtions. The telescope was repointed to the GRB110901A only 47 min 40 sec after trigger time at 2011-08-01 20:37:22 UT. We found OT at UVOT postion (De Pasquale et al., GCN 12228). The results of our photometry are: Time_Start T_mean-T_trig exp time m error Band UT s s 20:37:22 2950 180 16.13 0.06 R 20:44:29 3377 180 16.12 0.06 R 20:48:01 3589 180 16.29 0.08 R 20:48:01 3589 180 16.03 0.06 White 20:51:24 3792 180 16.43 0.06 R 20:51:24 3792 180 16.19 0.06 White 23:20:14 12722 180 17.75 0.10 R The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.08 in the direction of the burst (Schlegel et al. 1998). The power low index (F~t^-aplha) apha ~1.0+-0.1 during this observations in R-band. The message may be cited.
GCN 12619 table
GRB_name GRB111022B
GCN_number 12619
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 12619 SUBJECT: GRB 111022B: CrAO optical limit DATE: 11/12/04 22:27:27 GMT FROM: Alexei Pozanenko at IKI, Moscow V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 111022B (Holland et al. GCN 12472) with Shajn telescope of CrAO observatory starting on Oct. 22 (UT) 20:44:36 under a mean seeing (FWHM) of 3.2 arsces. We took several frames with exposure of 60 s in R-band. Within enhanced Swift-XRT position (Beardmore et al. GCN 12478) we do not detected any optical source. A photometry is based on the USNO B1.0 star 1396-0186811 (07 15 51.05 +49 40 13.0) assuming R=17.07 . T_start UT T0+ Filter, Exposure, OT, uplim (3 sigma) (mid, d) (s) 20:44:36 0.1711 R 64x60 n/d 22.8