GRB140930B

This page lists all entries on GRB140930B in GRBweb

Summary IPN Swift GCN 16857 GCN 16858 GCN 16859 GCN 16860 GCN 16861 GCN 16862 GCN 16863 GCN 16865 GCN 16866 GCN 16867 GCN 16868 GCN 16869 GCN 16870 GCN 16872 GCN 16873 GCN 16875

Summary table
Variable Value Source
T0 19:41:42 UTC GCN_circulars,Swift Det
ra 6.3477° Swift
decl 24.2946° Swift
pos_error 2.07e-04° Swift
T90 0.84 s Swift
T90_start 19:41:42 UTC Swift
fluence 4.20e-07 erg/cm² Swift
T100 0.84 s
GBM_located False
mjd 56930.820625 GCN_circulars,Swift Det
IPN table
GRB_name GRB140930B
ra 6.3542°
decl 24.2667°
pos_error 5.00e-02°
Swift table
GRB_name GRB140930B
t_trigger 19:41:42 UTC
ra 6.3477°
decl 24.2946°
pos_error 2.07e-04°
T90 0.84 s
fluence 4.20e-07 erg/cm²
GCN 16857 table
GRB_name GRB140930B
GCN_number 16857
Detection_method Swift Det
t_trigger 19:41:42 UTC
ra 6.3550°
decl 24.2750°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16857 SUBJECT: GRB 140930B: Swift detection of a short burst DATE: 14/09/30 19:56:21 GMT FROM: Scott Barthelmy at NASA/GSFC M. De Pasquale (INAF-IASFPA), S. D. Barthelmy (GSFC), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), V. Mangano (PSU), C. B. Markwardt (NASA/GSFC), A. Maselli (INAF-IASFPA), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU) and C. A. Swenson (PSU) report on behalf of the Swift Team: At 19:41:42 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140930B (trigger=614094). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 6.355, +24.275, which is RA(J2000) = 00h 25m 25s Dec(J2000) = +24d 16' 30" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single spike with a duration of about 2 sec. The peak count rate was ~11,000 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 19:44:58.9 UT, 196.9 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 6.34833, 24.29681 which is equivalent to: RA(J2000) = 00h 25m 23.60s Dec(J2000) = +24d 17' 48.5" with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 81 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 in excess of the Galactic value (3.45 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 4.8 (+3.58/-3.02) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 150 seconds with the White filter starting 201 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 0.03. Burst Advocate for this burst is M. De Pasquale (mdp AT ifc.inaf.it). 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 16858 table
GRB_name GRB140930B
GCN_number 16858
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 16858 SUBJECT: GRB 140930B: MASTER early optical observations DATE: 14/09/30 20:01:31 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, M.Pruzhinskaya, V.Kornilov, D.Kuvshinov, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, D.Denisenko, A.Sankovich Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A. Gabovich Blagoveschensk Educational State University, Blagoveschensk K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB140930B 21 sec after notice time and 39 sec after trigger time at 2014-09-30 19:42:21 UT in two polarizations. On our first (10s exposure) set we haven't found optical transient within SWIFT error-box (ra=00 25 25 dec=+24 16 28 r=0.050000). The 5-sigma upper limit has been about 16.0 mag MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB140930B 36 sec after notice time and 54 sec after trigger time at 2014-09-30 19:42:36 UT in two polarizations. On our first (10s exposure) set we haven't found optical transient within SWIFT error-box (ra=00 25 25 dec=+24 16 27 r=0.050000). The 5-sigma upper limit has been about 15.5 mag The observations on both observatories is continued.
GCN 16859 table
GRB_name GRB140930B
GCN_number 16859
Detection_method Swift-XRT Other
ra 6.3478°
decl 24.2948°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16859 SUBJECT: GRB 140930B: Prompt enhanced Swift-XRT position DATE: 14/09/30 20:39:57 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Using promptly downlinked XRT event data for GRB 140930B, we find an enhanced XRT position of the afterglow: RA, Dec: 6.3478, 24.2948 which is equivalent to: RA (J2000) = 00 25 23.46 Dec (J2000) = +24 17 41.3 with an uncertainty of 2.0 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/614094. Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular is an official product of the Swift-XRT team.
GCN 16860 table
GRB_name GRB140930B
GCN_number 16860
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 16860 SUBJECT: GRB 140930B: 1.23m CAHA optical observations DATE: 14/09/30 22:49:49 GMT FROM: Javier Gorosabel at IAA-CSIC J. Gorosabel (IAA-CSIC/UPV-EHU), S. Hellmich (DLR), S. Mottola (DLR), on behalf of a larger collaboration report: We observed the GRB 140930B (De Pasquale GCN 16857) field with the 1.23m CAHA telescope. The observations were carried out in the R-band on Sep 30.82728-30.86076 UT (9.6-57.8 minutes post GRB). A very preliminary analysis does not reveal any optical source consistent with the enhanced XRT position (Evans et al. GCN 16859) brighter than R(Vega)~21, calibrated against the USNO B1.0 catalog. A further analysis is ongoing.
GCN 16861 table
GRB_name GRB140930B
GCN_number 16861
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16861 SUBJECT: GRB 140930B: WHT detection of candidate afterglow DATE: 14/10/01 00:03:34 GMT FROM: Nial Tanvir at U.Leicester N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick) and M. Fraser (IoA, U. Cambridge) report: We observed the position of GRB 140930B (De Pasquale et al. GCN 16857) with ACAM on the WHT. Observations began at 22:40 UT, approximately 3.0 hr post burst. We detect a faint point source consistent with the revised X-ray position (Evans et al. GCN 16859) with a magnitude r~21.8 and position 00:25:23.45 +24:17:39.0 (provisional calibration). We note that no source is visible at this location in the SDSS observations of the field and therefore suggest it is likely to be the afterglow of this burst.
GCN 16862 table
GRB_name GRB140930B
GCN_number 16862
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 16862 SUBJECT: GRB 140930B: ISON-Kislovodsk observations DATE: 14/10/01 00:47:16 GMT FROM: Alexei Pozanenko at IKI, Moscow K. Polyakov (ISON), A. Pozanenko (IKI), A. Volnova (IKI), I. Molotov (KIAM), report on behalf of larger collaboration: We observed the field of GRB 140930B (De Pasquale et al., GCN 16857) with Santel-400AN telescope of ISON-Kislovodsk observatory starting on Sep. 30 (UT) 19:52:24, i.e. ~10.5 minutes after burst trigger. We took 30 unfiltered images of 120 s exposure. In the enhanced XRT position (Evans et al. GCN 16859) we do not detect the optical candidate (Tanvir et al., GCN 16861). A preliminary upper limit of the first image is 19.5m (at mid time (UT) 19:53:24) and is based on nearby USNO-B1.0 stars, R2 magnitudes.
GCN 16863 table
GRB_name GRB140930B
GCN_number 16863
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 16863 SUBJECT: GRB 140930B: MMT confirmation of the optical afterglow DATE: 14/10/01 06:47:14 GMT FROM: Wen-fai Fong at U of Arizona W. Fong (U. Arizona), M. Calkins (SAO), and E. Berger (Harvard) report: "We observed the location of the short-duration GRB 140930B (De Pasquale et al., GCN 16857) with MMTCam mounted on the 6.5-m MMT starting on 2014 Oct 1.144 UT (7.76 hr post-burst). We obtained 4x300-sec of r-band observations in 1" seeing. We detect a source at the position of the candidate optical afterglow (Tanvir et al., GCN 16861) with a magnitude of r~24.0 +/- 0.2 (calibrated to SDSS), indicating that the source faded by ~2.2 mag between 3.0 hr and 7.8 hr post-burst. The fading confirms that this source is the optical afterglow of GRB 140930B. Assuming a single power-law decline between these two epochs, the decay index is alpha~-2.1. We thank Nelson Caldwell for the rapid scheduling of these observations."
GCN 16865 table
GRB_name GRB140930B
GCN_number 16865
Detection_method Swift-XRT Det
ra 6.3477°
decl 24.2940°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16865 SUBJECT: GRB 140930B: Enhanced Swift-XRT position DATE: 14/10/01 10:28:53 GMT FROM: Phil Evans at U of Leicester M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using 1478 s of XRT Photon Counting mode data and 3 UVOT images for GRB 140930B, 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 = 6.34767, +24.29398 which is equivalent to: RA (J2000): 00h 25m 23.44s Dec (J2000): +24d 17' 38.3" with an uncertainty of 2.3 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 16866 table
GRB_name GRB140930B
GCN_number 16866
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16866 SUBJECT: GRB 140930B: Swift-XRT refined Analysis DATE: 14/10/01 10:56:03 GMT FROM: Phil Evans at U of Leicester V. Mangano (PSU), M.C. Stroh (PSU), P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), J.P. Osborne (U. Leicester), V. D'Elia (ASDC), M. de Pasquale (INAF-IASFPA), A. Maselli (INAF-IASFPA), D.N. Burrows (PSU) and M. De Pasquale report on behalf of the Swift-XRT team: We have analysed 7.5 ks of XRT data for GRB 140930B (De Pasquale et al. GCN Circ. 16857), from 182 s to 14.3 ks after the BAT trigger. The data comprise 8 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 16859). The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=2.13 (+0.21, -0.19). At T+952 s the decay flattens to an alpha of 0.95 (+0.23, -0.47) before breaking again at T+6412 s to a final decay with index alpha=3.3 (+2.3, -1.3). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.71 (+0.16, -0.15). The best-fitting absorption column is 6.0 (+4.3, -2.6) x 10^20 cm^-2, consistent with the Galactic value of 3.5 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (4.2 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 6.0 (+4.3, -2.6) x 10^20 cm^-2 Galactic foreground: 3.5 x 10^20 cm^-2 Excess significance: <1.6 sigma Photon index: 1.71 (+0.16, -0.15) If the light curve continues to decay with a power-law decay index of 3.3, the count rate at T+24 hours will be 5.8 x 10^-6 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.2 x 10^-16 (2.4 x 10^-16) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00614094. This circular is an official product of the Swift-XRT team.
GCN 16867 table
GRB_name GRB140930B
GCN_number 16867
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16867 SUBJECT: GRB 140930B: Keck NIR imaging DATE: 14/10/01 11:07:31 GMT FROM: Daniel Perley at Caltech D. A. Perley and J. Jencson (Caltech) report: We imaged the location of short-duration GRB 140930B (De Pasquale et al., GCN 16857) using the Multi-Object Spectrometer for Infrared Exploration (MOSFIRE) on the Keck I 10 meter telescope between 08:44 and 09:04 on 2014-10-01 (UT). We acquired 9 x 35-second exposures in Ks-band and 9 x 44-second exposures in J-band. A faint point-like source is detected at RA=00:25:23.433, dec=+24:17:39.41 (J2000), a location consistent with the afterglow locations previously reported by Evans et al. (GCN 16865) and Tanvir et al. (GCN 16861). Photometry relative to 2MASS gives approximate magnitudes (Vega) of: J = 22.2 +/- 0.2 (tmid = 13.31 hr) Ks = 20.8 +/- 0.3 (tmid = 13.12 hr) We thank M. Kasliwal and T. Prince for the observing time.
GCN 16868 table
GRB_name GRB140930B
GCN_number 16868
Detection_method Konus-Wind Det
t_trigger 19:41:47.149 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 16868 SUBJECT: Konus-Wind observation of GRB 140930B DATE: 14/10/01 13:06:20 GMT FROM: Dmitry Svinkin at Ioffe Institute S. Golenetskii, R. Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report: A short-duration, hard-spectrum GRB 140930B (Swift-BAT detection: Pasquale et al., GCN 16857) triggered Konus-Wind at T0=70907.149 s UT (19:41:47.149). The burst light curve shows a single pulse with a duration of ~1.0 s. The emission is seen up to ~10 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB140930_T70907/ As observed by Konus-Wind, the burst had a fluence of 8.1(-2.5,+5.1)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0-0.010 s, of 3.4(-1.1,+2.3)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 15 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.6 (-0.5,+0.6) and Ep = 1302 (-459,+2009) keV (chi2 = 99/92 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -1.6 (chi2 = 98/91 dof) All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN 16869 table
GRB_name GRB140930B
GCN_number 16869
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16869 SUBJECT: GRB 140930B: Swift/UVOT Upper Limits DATE: 14/10/01 13:22:17 GMT FROM: Alice Breeveld at MSSL-UCL A. A. Breeveld (UCL-MSSL) and M. De Pasquale (INAF-IASFPA) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 140930B 201s after the BAT trigger (De Pasquale et al., GCN Circ. 16857). No optical afterglow consistent with the XRT position (Goad et al., GCN Circ. 16865) or the optical position (Tanvir et al., GCN Circ. 16861) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 201 351 147 >20.2 white 201 2579 528 >20.9 v 507 2629 253 >18.8 b 433 2787 311 >19.9 u 407 2702 253 >19.4 w1 383 2678 253 >19.4 m2 358 2653 214 >19.3 w2 483 2605 253 >19.7 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).
GCN 16870 table
GRB_name GRB140930B
GCN_number 16870
Detection_method Swift-BAT Det
ra 6.3600°
decl 24.2980°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16870 SUBJECT: GRB 140930B Swift-BAT refined analysis DATE: 14/10/01 13:28:23 GMT FROM: Hans Krimm at NASA-GSFC W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), M. De Pasquale (INAF-IASFPA), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-61 to T+174 sec from the recent telemetry downlink, we report further analysis of BAT GRB 140930B (trigger #614094) (De Pasquale, et al., GCN Circ. 16857). The BAT ground-calculated position is RA, Dec = 6.360, 24.298 deg which is RA(J2000) = 00h 25m 26.4s Dec(J2000) = +24d 17' 53.3" with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 24%. The mask-weighted light curve shows a single FRED-like peak with structure, beginning at ~T-0.1 sec, peaking at T+0 sec and decaying to background by T+1.0 sec. There is no clear sign of extended emission. T90 (15-350 keV) is 0.84 +- 0.12 sec (estimated error including systematics). The time-averaged spectrum from T-0.10 to T+0.86 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.64 +- 0.19. The fluence in the 15-150 keV band is 4.2 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.12 sec in the 15-150 keV band is 4.0 +- 0.4 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The position of GRB 140930B in the BAT hardness-duration diagram places it clearly in the short hard burst part of the diagram. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/614094/BA/
GCN 16872 table
GRB_name GRB140930B
GCN_number 16872
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 16872 SUBJECT: GRB 140930B: GROND observations DATE: 14/10/01 20:16:18 GMT FROM: Sylvio Klose at TLS Tautenburg J. Graham (MPE Garching), A. Nicuesa Guelbenzu (TLS Tautenburg), J. Bolmer and J. Greiner (both at MPE Garching) report on behalf of the GROND team: We observed the field of GRB 140930B (Swift trigger 614094; De Pasquale et al., GCN #16857) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at La Silla Observatory (Chile). Observations started at 02:25 UT on 1 October 2014, around 7 hours after the GRB trigger. They were performed at an average seeing of 1.4" and at an average airmass of 1.9. We detect the afterglow candidate reported by Tanvir et al. (GCN #16861) and confirmed by Fong et al. (GCN #16863). At a midtime of 03:00 UT we measure a preliminary AB magnitude of r' = 23.2 +/- 0.2 mag. The analysis of the other GROND photometric bands is still on-going. We note that the photometry is slightly affected by a bright star next to the afterglow. The given magnitude is calibrated against SDSS field stars and not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.04 mag in the direction of the burst (Schlegel et al. 1998).
GCN 16873 table
GRB_name GRB140930B
GCN_number 16873
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 16873 SUBJECT: GRB 140930B: Gemini South Spectroscopy DATE: 14/10/02 02:11:11 GMT FROM: S. Bradley Cenko at NASA/GSFC S. B. Cenko, A. Cucchiara (NASA/GSFC), N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick), and D. A. Perley (Caltech) report on behalf of a larger collaboration: We obtained a spectrum of the optical afterglow (Tanvir et al., GCN 16861; Fong et al., GCN 16863) of the short GRB 130930B (De Pasquale et al., GCN 16857) with the Gemini Multi-Object Spectrograph mounted on the 8 m Gemini South telescope. Observations began at 4:01 UT on 2014 October 1 (8.3 hr after the Swift trigger) and cover the wavelength range from 3700-8300 A. We detect a weak continuum trace at the location of the afterglow over most of the observed wavelength range (lambda >~ 4000 A), but no obvious emission or absorption features.
GCN 16875 table
GRB_name GRB140930B
GCN_number 16875
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16875 SUBJECT: GRB 140930B: MASTER early possible OT detection DATE: 14/10/02 06:41:06 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, M.Pruzhinskaya, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D.Denisenko Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A. Gabovich Blagoveschensk Educational State University, Blagoveschensk K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) Two MASTER II twin robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk and Kislovodsk was pointed to the GRB140930B (Pasquale et. al GCN 16857) 21 and 36 sec after notice time and 39 and 54 sec after trigger time respectively. So we have 4 first images in four different polarization started after 21 sec (Blagoveschensk) and 36 sec (Kislovodsk) with 10 sec exposure. We found 3-sigma OT on one tube image in Blagoveschensk at the WHT position (Tanvir et. al, GCN16861, Fong et. al. GCN16863) with m = 16+-0.5 mag. The OT seen at one first image only. The image with OT is available at http://master.sai.msu.ru/static/GRB/GRB140930B_MASTER_OT.png We do not see OT (Tanvir et. al GCN16857, Fong et. al. GCN16857) on three tube images on single and coadd images. The analysis strongly is complicated by presence of very bright star (USNO B1 1142-0005722 ~14m) close to OT position. The upper limits received by MASTER are given in the table below: t_start | t-t_mid | exptime | filt | lim | site | coadd --------------------------+---------+------+------+------+------- 19:42:21.909 | 44 sec | 10 | P/ | 16.4 | A | 1 19:42:21.909 | 44 sec | 10 | P\ | 15.7 | A | 1* 19:42:36.837 | 59 sec | 10 | P| | 15.6 | K | 1 19:42:36.837 | 59 sec | 10 | P- | 16.0 | K | 1 19:42:21.909 | 70 sec | 40 | P/ | 17.3 | A | 3 19:42:36.837 | 98 sec | 50 | P- | 16.9 | K | 3 19:42:21.909 | 130 sec | 130 | P/ | 18.5 | A | 6 19:44:26.834 | 243 sec | 120 | P- | 18.0 | K | 3 19:42:36.837 | 188 sec | 170 | P- | 18.6 | K | 6 19:42:36.837 | 692 sec | 1060 | P- | 19.9 | K | 13 19:42:21.909 | 698 sec | 1160 | P/ | 19.7 | A | 14 20:29:14.938 | 6120 sec | 5400 | C |~21.5 | K | 30 * possible OT C is our white (clear) band which is well described by a parity 0.8R+0.2B (USNO B1). P/ and P\ is a polarization filter which are oriented at an angle 45 and 135 degrees to RA axis respectivel. P- and P| is a polarization filter which are oriented at an angle 0 and 90 degrees to RA axis respectivel. This message may be cited.