GRB141026A

This page lists all entries on GRB141026A in GRBweb

Summary IPN Swift GCN 16950 GCN 16951 GCN 16952 GCN 16953 GCN 16954 GCN 16955 GCN 16956 GCN 16957 GCN 16958 GCN 16960 GCN 16961 GCN 16962 GCN 16964 GCN 16965 GCN 16966 GCN 16967 GCN 16968 GCN 16970 GCN 16974 GCN 17019 GCN 17031 GCN 17033

Summary table
Variable Value Source
T0 2:36:51 UTC GCN_circulars,Swift Det
ra 44.0845° Swift
decl 26.9283° Swift
pos_error 2.07e-04° Swift
T90 146.0 s Swift
T90_start 2:36:51 UTC Swift
fluence 1.30e-06 erg/cm² Swift
redshift 3.3500 Swift
T100 146.0 s
GBM_located False
mjd 56956.108923611115 GCN_circulars,Swift Det
IPN table
GRB_name GRB141026A
ra 44.0792°
decl 26.9667°
pos_error 5.00e-02°
Swift table
GRB_name GRB141026A
t_trigger 2:36:51 UTC
ra 44.0845°
decl 26.9283°
pos_error 2.07e-04°
T90 146.0 s
fluence 1.30e-06 erg/cm²
redshift 3.3500
GCN 16950 table
GRB_name GRB141026A
GCN_number 16950
Detection_method Swift Det
t_trigger 2:36:51 UTC
ra 44.0800°
decl 26.9600°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16950 SUBJECT: GRB 141026A: Swift detection of a burst DATE: 14/10/26 02:50:59 GMT FROM: Scott Barthelmy at NASA/GSFC L. M. Z. Hagen (PSU), S. D. Barthelmy (GSFC), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), B. Sbarufatti (INAF-OAB/PSU) and M. H. Siegel (PSU) report on behalf of the Swift Team: At 02:36:51 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 141026A (trigger=616502). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 44.080, +26.960 which is RA(J2000) = 02h 56m 19s Dec(J2000) = +26d 57' 36" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The real-time TDRSS BAT light curve does not show anything as is typical for an image trigger. The XRT began observing the field at 02:39:28.2 UT, 157.0 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 44.0839, 26.9262 which is equivalent to: RA(J2000) = +02h 56m 20.14s Dec(J2000) = +26d 55' 34.3" with an uncertainty of 6.1 arcseconds (radius, 90% containment). This location is 122 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy. The initial flux in the 0.1 s image was 1.58e-08 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 43 seconds with the White filter starting 165 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 0.19. Burst Advocate for this burst is L. M. Z. Hagen (lea.zernow.hagen AT gmail.com). 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 16951 table
GRB_name GRB141026A
GCN_number 16951
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16951 SUBJECT: GRB 141026A: P60 early observations DATE: 14/10/26 04:07:01 GMT FROM: Daniel Perley at Caltech D. A. Perley (Caltech) reports on behalf of a larger collaboration: The Palomar 60-inch telescope automatically responded to the alert for GRB 141026A (Hagen et al, GCN 16950) and began imaging the field at 02:41:55.320 UT, 5.07 minutes after the Swift trigger. A sequence of 60-second r, i, and z exposures was obtained. The field was at high airmass (~3.3) at the start of the observations. We do not detect any clear source inside the XRT error circle in the individual exposures. After stacking the first 11 frames taken in each filter, in the r-band stack only there is a marginal detection of a possible source at RA = 02:56:19.885, dec = +26:55:35.80 with R~22 mag. Observations are continuing and additional follow-up is planned.
GCN 16952 table
GRB_name GRB141026A
GCN_number 16952
Detection_method Swift-XRT Other
ra 44.0840°
decl 26.9281°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16952 SUBJECT: GRB 141026A: RATIR Optical Observations DATE: 14/10/26 05:47:05 GMT FROM: Owen Littlejohns at Az State U Owen Littlejohns (ASU), Nat Butler (ASU), Antonino Cucchiara (ORAU/GSFC), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Eleonora Troja (GSFC), Enrico Ramirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of GRB 141026A (Hagen, et al., GCN 16950) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 26.13 to 26.20 UTC (0.54 to 2.20 hours after the BAT trigger), obtaining a total of 1.07 hours exposure in the r and i bands. For a source within the Swift-XRT error circle, we obtain the following upper limits (3-sigma): r > 23.50 i > 23.56 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. We do not detect the source observed by P60 (Perley, et al., GCN 16951). We do, however, detect a source at the edge of the Swift- XRT error circle at RA(J2000) = 44.084036, Dec(J2000) = 26.928134. r 21.67 +/- 0.08 i 21.52 +/- 0.07 We cannot presently determine if this source is fading. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
GCN 16953 table
GRB_name GRB141026A
GCN_number 16953
Detection_method GROND
ra 44.0840°
decl 26.9282°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16953 SUBJECT: GRB 141026A: GROND observations DATE: 14/10/26 05:56:23 GMT FROM: Alexander Kann at TLS Tautenburg K. Varela (MPE Garching), D. A. Kann (TLS Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND team: We observed the field of GRB 141026A (Swift trigger 616502; Hagen et al., GCN #16950) 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 ESO La Silla Observatory (Chile). Observations started at 02:51 UT on October 26th, approximately 15 min after the GRB trigger. They were performed at high airmass (2.5 but rising) but decent seeing (1".2). At the position of the P60 candidate (Perley, GCN #16951) we do not detect any source. We find a source just to the north of the 5".8 Swift-XRT error circle reported by Hagen et al. at RA (J2000) = 02:56:20.16 DEC (J2000) = +26:55:41.4 with an error of 0".5. This source is also reported by RATIR (Littlejohns et al., GCN #16952). We do not find any variability within errors over the course of our observations. It is likely not associated with the GRB. Based on images with an exposure time of 1500 s in the optical and 1200 s in the NIR, centered at 0.05598 days after the trigger, we estimate preliminary magnitudes and limits (all in AB system) for this source of: g' = 23.2 +/- 0.1 mag r' = 21.8 +/- 0.1 mag i' = 21.5 +/- 0.1 mag z' = 21.2 +/- 0.1 mag J = 20.9 +/- 0.3 mag H = 20.5 +/- 0.3 mag K > 18.7 mag Given magnitudes are calibrated against GROND zeropoints (g'r'i'z') and 2MASS field stars (JHK) and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.18 mag in the direction of the burst (Schlegel et al. 1998).
GCN 16954 table
GRB_name GRB141026A
GCN_number 16954
Detection_method Optical
ra 44.0839°
decl 26.9281°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16954 SUBJECT: GRB 141026A: 1.23m CAHA I-band observations DATE: 14/10/26 06:22:36 GMT FROM: Javier Gorosabel at IAA-CSIC J. Gorosabel (IAA-CSIC/UPV-EHU), S. Hellmich (DLR), A. de Ugarte Postigo (IAA-CSIC/DARK), S. Mottola (DLR), report on behalf of a larger collaboration: We observed the field of the GRB141026A (Hagen, et al., GCN 16950) with the 1.23m CAHA telescope in the I-band filter. Observations started on Oct. 26.11639 UT (10.75 min post burst). A faint object is detected at RA=02:56:20.13, DEC=26:55:41.3 (+/-0.6", J2000) with Vega magnitude I~20.6 against the USNO B1.0 catalog. The coordinates of this object are consistent with the ones reported by Littlejohns et al. (GCN 16592) and Varela et al. (GCN 16953). No object brighter than I~21.0 (Vega) is detected consistent with the optical source reported by Perley (GCN 16951).
GCN 16955 table
GRB_name GRB141026A
GCN_number 16955
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 16955 SUBJECT: GRB141026A: Deep P200 optical imaging DATE: 14/10/26 07:51:45 GMT FROM: Daniel Perley at Caltech D. A. Perley, M. Brown, I. Wong, and E. Bailey (Caltech) report: We imaged the location of GRB 141026A (Hagen et al., GCN 16950) using the Large-Format Camera on the 5m Hale Telescope at Palomar Observatory. Six exposures of four minutes each were acquired using the Broad-RI (620-920 nm) filter between 03:34:50 and 04:03:51 UT (58-87 minutes after the BAT trigger). The object north of the error circle reported by Littlejohns et al. (GCN 16592), Varela et al. (GCN 16953), and Gorosabel et. al (GCN 16954) is well-detected in the stacked image. No other object is detected in or near the XRT error circle, including at the position of the previously-reported, low-significance object from the early P60 imaging (GCN 16951), down to a limit of RI > 25.5 mag (calibrated relative to the R2 magnitude of a nearby USNO B1.0 star).
GCN 16956 table
GRB_name GRB141026A
GCN_number 16956
Detection_method Swift-XRT Det
ra 44.0844°
decl 26.9280°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16956 SUBJECT: GRB 141026A: Enhanced Swift-XRT position DATE: 14/10/26 12:06:07 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 2855 s of XRT Photon Counting mode data and 8 UVOT images for GRB 141026A, 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 = 44.08435, +26.92804 which is equivalent to: RA (J2000): 02h 56m 20.24s Dec (J2000): +26d 55' 40.9" with an uncertainty of 1.9 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 16957 table
GRB_name GRB141026A
GCN_number 16957
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 16957 SUBJECT: GRB 141026A: MASTER early optical observations DATE: 14/10/26 12:24:38 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) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB141026A 22 sec after notice time and 99 sec after trigger time at 2014-10-26 02:38:31 UT in two polarizations. On our first single and coadd images we haven't found optical transient within SWIFT error-box (Hagen et. al. GCN 16950). The 5-sigma upper limit has been about 16.5 on single (20s exposure) and 17.5 on coadd image (from first 3 images with total exposure 80 sec). The message may be cited. The publication delay was due to time zone changes during this night. This message may be cited.
GCN 16958 table
GRB_name GRB141026A
GCN_number 16958
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 16958 SUBJECT: GRB 141026A: MASTER early optical observations DATE: 14/10/26 12:26:01 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) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB141026A 22 sec after notice time and 99 sec after trigger time at 2014-10-26 02:38:31 UT in two polarizations. On our first single and coadd images we haven't found optical transient within SWIFT error-box (Hagen et. al. GCN 16950). The 5-sigma upper limit has been about 16.5 on single (20s exposure) and 17.5 on coadd image (from first 3 images with total exposure 80 sec). The message may be cited. This message may be cited. [GCN OPS NOTE: The disrtibution was delayed ~8.8 hours due to a problem with the authentication process.]
GCN 16960 table
GRB_name GRB141026A
GCN_number 16960
Detection_method Swift-BAT Det
ra 44.0490°
decl 26.9250°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16960 SUBJECT: GRB 141026A: Swift-BAT refined analysis DATE: 14/10/26 14:41:51 GMT FROM: Takanori Sakamoto at AGU M. Stamatikos (OSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), L. M. Z. Hagen (PSU), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), J. Tueller (GSFC), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-239 to T+380 sec from the recent telemetry downlink, we report further analysis of BAT GRB 141026A (trigger #616502) (Hagen, et al., GCN Circ. 16950). The BAT ground-calculated position is RA, Dec = 44.049, 26.925 deg which is RA(J2000) = 02h 56m 11.8s Dec(J2000) = +26d 55' 31.7" with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 88%. The mask-weighted light curve shows a weak episode starting at ~T+15 sec, and ending around ~T+180 sec. T90 (15-350 keV) is 146 +- 13 sec (estimated error including systematics). Note since this GRB went outside the FOV of BAT around ~T+250 sec, this duration measurement might be affected if there were significant emission from the source after ~T+250 sec. The time-averaged spectrum from T+13.96 to T+177.75 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.34 +- 0.19. 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+65.64 sec in the 15-150 keV band is 0.4 +- 0.2 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/616502/BA/
GCN 16961 table
GRB_name GRB141026A
GCN_number 16961
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16961 SUBJECT: GRB 141026A: Swift-XRT refined Analysis DATE: 14/10/26 17:51:04 GMT FROM: Phil Evans at U of Leicester V. D'Elia (ASDC), M. de Pasquale (INAF-IASFPA), D.N. Burrows (PSU), J.A. Kennea (PSU), V. Mangano (PSU), P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), J.P. Osborne (U. Leicester), A. Maselli (INAF-IASFPA) and L.M.Z. Hagen report on behalf of the Swift-XRT team: We have analysed 10 ks of XRT data for GRB 141026A (Hagen et al. GCN Circ. 16950), from 160 s to 46.2 ks after the BAT trigger. The data comprise 49 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 16956). The late-time light curve (from T0+3.5 ks) can be modelled with a power-law decay with a decay index of alpha=0.35 (+0.11, -0.12). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.07 (+0.09, -0.08). The best-fitting absorption column is 4.9 (+/-0.5) x 10^21 cm^-2, in excess of the Galactic value of 1.6 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.92 (+0.28, -0.26) and a best-fitting absorption column of 2.8 (+1.2, -1.0) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (5.4 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 2.8 (+1.2, -1.0) x 10^21 cm^-2 Galactic foreground: 1.6 x 10^21 cm^-2 Excess significance: 2.0 sigma Photon index: 1.92 (+0.28, -0.26) If the light curve continues to decay with a power-law decay index of 0.35, the count rate at T+24 hours will be 0.023 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.9 x 10^-13 (1.2 x 10^-12) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00616502. This circular is an official product of the Swift-XRT team.
GCN 16962 table
GRB_name GRB141026A
GCN_number 16962
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 16962 SUBJECT: GRB 141026A: Continued RATIR Optical and NIR Observations, Afterglow Detection DATE: 14/10/26 18:50:06 GMT FROM: Nat Butler at UC berkeley Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of GRB 141026A (Hagen, et al., GCN 16950)) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2014/10 26.13 to 2014/10 26.26 UTC (0.54 to 3.58 hours after the BAT trigger), obtaining a total of 2.49 hours exposure in the r, i, and z bands. With increased time-coverage, the source reported in Littlejohns et al. (GCN 16952; also Perley et al., GCN 16955, Varela et al., GCN 16953, Gorosabel et al., GCN 16954, ) appears to peak on a timescale of 1 hour, and then fade in the r and i bands. Given also that its position is consistent with the enhanched XRT error region (Beardmore et al., GCN 16956), this source is likely to be the afterglow to GRB 141026A. In comparison with 2MASS, we obtain the following detections and upper limit (3-sigma): r 21.74 +/- 0.07 i 21.54 +/- 0.06 z > 20.5 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. Further observations are planned. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
GCN 16964 table
GRB_name GRB141026A
GCN_number 16964
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16964 SUBJECT: GRB 141026A: Swift/UVOT Upper Limits DATE: 14/10/26 21:57:26 GMT FROM: Lea Hagen at PSU L. M. Z. Hagen (PSU) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 141026A 166 s after the BAT trigger (Hagen et al., GCN Circ. 16950). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 16956) or the likely optical afterglow (Littlejohns et al. GCN Circ. 16952, Varela et al. GCN Circ. 16953, Gorosabel et al. GCN Circ. 16954, Perley et al. GCN Circ. 16955, Butler et al. GCN Circ. 16962) 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 initial exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white (fc) 165 208 83 >19.98 white 3462 5667 688 >21.45 v 144 5962 290 >19.34 b 3826 5463 393 >20.48 u 3621 5258 393 >20.15 uvw1 4852 5052 196 >19.61 uvm2 4647 4847 196 >19.58 uvw2 4237 5873 393 >20.26 The magnitudes in the table are not corrected for the Galactic extinction due to the substantial reddening of E(B-V) = 0.19 in the direction of the burst (Schlegel et al. 1998).
GCN 16965 table
GRB_name GRB141026A
GCN_number 16965
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 16965 SUBJECT: GRB 141026A: Continued RATIR Optical and NIR Observations DATE: 14/10/27 16:56:57 GMT FROM: Nat Butler at Az State U Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of GRB 141026A (Hagen, et al., GCN 16950)) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2014/10 27.13 to 2014/10 27.53 UTC (24.48 to 34.08 hours after the BAT trigger), obtaining a total of 4.64 hours exposure in the r, i, and z bands. The optical afterlow (Littlejohns et al., GCN 16952; also Perley et al., GCN 16955, Varela et al., GCN 16953, Gorosabel et al., GCN 16954, Butler, et al., GCN 16962) continues to fade. In comparison with 2MASS, we obtain the following detections and upper limit (3-sigma): r 22.94 +/- 0.16 i 23.16 +/- 0.22 z > 20.1 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. The source appears to have faded roughly as t^(-0.5) since our last epoch (GCN 16962). We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir. Further observations are planned.
GCN 16966 table
GRB_name GRB141026A
GCN_number 16966
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16966 SUBJECT: GRB 141026A: SAO RAS Zeiss-1000 observations DATE: 14/10/27 18:37:38 GMT FROM: Vladimir Sokolov at SAO RAS A. S. Moskvitin, V. N. Komarova, T. N. Sokolova (SAO RAS) report on behalf of the GRB follow-up team: We observed the field of GRB 141026A (Hagen et al., GCN 16950) with the SAO RAS 1-m telescope Zeiss-1000 at the October 26/27 night. The observations were started at 20:09:49 UT (in 17.55 hours after the trigger), ended at 03:32:34. We obtained 61 x 300 sec. images in the Rc filter. The object mentioned by Littlejohns et al. (GCN 16592, GCN 16963), Varela et al. (GCN 16953), Gorosabel et al. (GCN 16954), Perley et al. (GCN 16955), Butler et al. (GCN 16962, GCN 16965) is clearly detected in the stacked image. The magnitude of OT is R = 22.1 +/- 0.1 (in Vega system, not corrected for the Milky Way extinction). The photometry is based on the nearby USNO-B1 stars. [GCN OPS NOTE(27oct14): Per author's request, the name of the GRB was corrected in the Subject-line: (13-->14).]
GCN 16967 table
GRB_name GRB141026A
GCN_number 16967
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 16967 SUBJECT: GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations DATE: 14/10/27 20:26:34 GMT FROM: Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet A. Trotter, J. Haislip, D. Reichart, V. Hoette, K. Cudworth, D. Harper, R. Kron, T. Linder, R. Russell, E. Struble, A. Aji, R. Beauchemin, T. Berger, A. Dow, A. Foster, N. Frank, M. Hinckle, K. Ivarsen, A. LaCluyze, M. Maples, J. Moore, M. Nysewander, C. Salemi, L. Zbinden, and J. A. Crain report: Skynet observed the Swift BAT/XRT localization of GRB 141026A (Hagen et al., GCN 16950, Swift trigger=616502) with one 24" telescope (PROMPT 8; I band) and four 16" telescopes (PROMPT 3,1,4,5; BVRI bands) of the PROMPT array at CTIO, Chile, and with the 41" telescope of Yerkes Observatory in Wisconsin, USA (g'r'i' bands). Starting at 2014-10-26 02:38:30 UT and continuing until 03:03 UT (t=1.5-26m post-trigger), Skynet took a total of 89 exposures ranging from 10s-160s each. We stacked subsets of these images to maximize the S/N ratio, and detected no optical source in any band at the OT position first reported by RATIR (Littlejohns et al., GCN 16952), and confirmed in later notices. Our 3-sigma limiting magnitudes are: ================================== tmid scope expos fil limit ================================== 10m PROMPT3 4x80s B >19.9 20m PROMPT1 4x160s V >20.4 19m PROMPT4 3x160s R >19.8 17m PROMPT5 4x80s I >19.9 4X160s 17m PROMPT8 12x80s I >20.0 63m Yerkes 1x80s g' >21.2 2x160s 60m Yerkes 2x80s r' >20.9 1x160s 66m Yerkes 1x80s i' >20.5 1x160s ================================== BVRI magnitudes are in the Vega System, and g'r'i' magnitudes are in the AB system, calibrated to 4 APASS stars in the field. Magnitudes have not been corrected for line-of-sight Milky Way dust extinction, with expected E(B-V)=0.16 (Schlafly & Finkbeiner 2011). No further Skynet observations are scheduled.
GCN 16968 table
GRB_name GRB141026A
GCN_number 16968
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16968 SUBJECT: GRB 141026A: GTC spectroscopy DATE: 14/10/28 16:59:55 GMT FROM: Antonio de Ugarte Postigo at IAA-CSIC A. de Ugarte Postigo (IAA-CISC, DARK/NBI), C.C. Thoene (IAA-CSIC), N.R. Tanvir (U. Leicester), J. Gorosabel (UPV, IAA-CSIC), J. Fynbo (DARK/NBI), G. Lombardi (GTC), D. Reverte-Paya (GTC), and D. Perez (GTC) report: We observed the afterglow of GRB 141026A (Hagen et al. GCN 16950, Perley GCN 16951, Littlejohns et al. GCN 16952, Varela et al. GCN 16953, Gorosabel et al. GCN 16954, Perley et al. GCN 16955, Beardmore et al. GCN 16956, Butler et al. GCN 16962,Moskvitin et al. GCN 16966) with OSIRIS at the 10.4m Gran Telescopio Canarias. Observations consisted of z-band imaging, and spectroscopy using the R1000R grism (covering from 5100 to 10000 A with a resolution of ~1000). The spectroscopic observations were delayed due to bad weather and had a mean epoch of 6:12 UT (3.59 hours after the burst), and consisted of 2x900s exposures. Conditions were not optimal, as the airmass at that time was ~1.8 and most of the observation was performed during twilight. The spectrum shows a low S/N continuum, which is however, visible between 5100 and 9500 A. Some absorption features seem to be present, and in particular we identify a broad feature at 5300 A, with an observed equivalent width of ~30 A. This could correspond to a weak Ly-alpha (log(N_H/cm^-2) ~< 20) absorption at z=3.35. However, no other features corresponding to that same redshift are seen, which is not unexpected for a low density line of sight that would correspond to such a Ly-alpha feature and a low S/N spectrum. Further absorptions could correspond to intervening MgII absorbers. This redshift solution is supported by the photometric drop seen by GROND in the g-band (Varela et al. GCN 16953), which would correspond to a similar photometric redshift.
GCN 16970 table
GRB_name GRB141026A
GCN_number 16970
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16970 SUBJECT: GRB 141026A: Continued RATIR Optical and NIR Observations DATE: 14/10/28 17:48:18 GMT FROM: Owen Littlejohns at Az State U Owen Littlejohns (ASU), Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora Troja (GSFC), Enrico Ramirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We again observed the field of GRB 141026A (Hagen, et al., GCN 16950) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2014/10 28.13 to 2014/10 28.19 UTC (48.58 to 49.84 hours after the BAT trigger), obtaining a total of 1.07 hours exposure in the r, i and z bands. For a source within the Swift-XRT error circle, we obtain the following upper limits (3-sigma): r > 23.54 i > 23.31 z > 19.82 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. In comparison to previous epochs of RATIR observations (Butler, et al., GCN 16965; Littlejohns, et al., GCN 16962), the GRB has continued to fade. The r band upper limit indicates a power-law decay between this and the previous epoch of RATIR observations with a minimum approximate index of t^(-0.9). This is steeper than that reported in Butler, et al. (GCN 16965). We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
GCN 16974 table
GRB_name GRB141026A
GCN_number 16974
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 16974 SUBJECT: GRB 141026A: IRAM 30m millimetre observations DATE: 14/10/28 20:26:53 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia A. J. Castro-Tirado, J. C. Tello, J. Gorosabel (IAA-CSIC Granada), C. Kramer, I. Hermelo, G. Paubert, A. Sievers (IRAM Granada) and J. G. Staguhn (NASA/GSFC Greenbelt),on behalf of a larger collaboration, report: Following the detection of GRB 141026A by Swift (Hagen et al. GCNC 16950), observations with the IRAM 30m antenna (+GISMO) at Pico Veleta (Spain) were triggered on 26-27 Oct. At the position of the optical afterglow (Littlejohns et al. GCNC 16952, Varela et al. GCNC 16953, Gorosabel et al. GCNC 16954), we detect no mm afterglow (at 2 mm) down to a preliminary flux density of 1.2 mJy (3 sigma) on Oct 26, 14:30 UT (mid time). We acknowledge excellent assistance from the IRAM observers.
GCN 17019 table
GRB_name GRB141026A
GCN_number 17019
Detection_method VLA Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 17019 SUBJECT: GRB 141026A: VLA observations DATE: 14/11/02 15:39:26 GMT FROM: Alessandra Corsi at Texas Tech U A. Corsi (Texas Tech U.) reports on behalf of a larger collaboration: We observed the location of GRB 141026A (Hagen et al., GCN 16950) with the Karl G. Jansky Very Large Array (VLA) in its C configuration. Observations were carried out in the frequency bands 18.7-24.9 GHz and 4.5-7.8 GHz. A provisional reduction shows marginal detections at 21.8 GHz (at about 1.1 d and 4.3 d after the burst), and a clearer detection at 6.2 GHz (at about 6 d after the burst), of a source consistent with the location of the GRB optical afterglow (Littlejohns et al. GCN 16952; Varela et al., GCN 16953; Gorosabel et al., GCN 16954; Perley et al. GCN 16955). We estimate preliminary fluxes for this source of: Mean epoch | Freq. (GHz) | Flux (uJy) | map rms (uJy) ------------------------------ 6.5 hr | 21.8 | 11 | 11 ------------------------------ 1.1 d | 21.8 | 43 | 11 ------------------------------ 4.3 d | 21.8 | 31 | 8 ------------------------------ 6.0 d | 6.2 | 91 | 7 ------------------------------
GCN 17031 table
GRB_name GRB141026A
GCN_number 17031
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17031 SUBJECT: GRB 141026A: Gemini-North optical and NIR imaging DATE: 14/11/05 21:03:36 GMT FROM: Wen-fai Fong at U of Arizona W. Fong (U. Arizona) and D. B. Fox (PSU) report on behalf of a larger collaboration: "We observed the location of the long-duration GRB 141026A (Hagen et al., GCN 16950) with the Gemini Multi-Object Spectrograph (GMOS) and the Near InfraRed Imager (NIRI) mounted on the Gemini-North 8-m telescope starting on 2014 Oct 26.402 UT (7.03 hr after the BAT trigger). We obtained 540-sec of z-band imaging, and a total of 1800-sec in the YJHKs-bands. We clearly detect the afterglow (Littlejohns et al., GCN 16952; Varela et al., GCN 16953; Gorosabel et al., GCN 16954; Perley et al., GCN 16955; Butler et al., GCN 16962, GCN 16970; Moskvitin et al., GCN 16966) in all bands. Using tabulated Gemini zeropoints, we measure an afterglow brightness of z(AB) = 22.0 +/- 0.1 mag and J(AB) = 21.9 +/- 0.1 mag at 7.03 hr after the burst. These magnitudes have not been corrected for Galactic extinction in the direction of the burst. We thank the Gemini staff for their assistance with these observations."
GCN 17033 table
GRB_name GRB141026A
GCN_number 17033
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17033 SUBJECT: GRB 141026A: CrAO optical observation DATE: 14/11/06 18:49:43 GMT FROM: Alexei Pozanenko at IKI, Moscow V. Rumyantsev (CrAO), E. Mazaeva (IKI), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: The GCN #17032 should be read as following: (We are sorry for inconvenience) We observed the field of the Swift GRB GRB 141026A (Hagen et al., GCN 16950) with ZTSh telescope of CrAO observatory starting on Oct. 26 (UT) 18:25:48. We took several images in R-filter of 120 s exposure under poor weather conditions and mean seeing of 5". The optical afterglow (Littlejohns et al. GCN 16592; Varela et al. GCN 16953; Gorosabel et al. GCN 16954) is clearly visible in our stacked image. Photometry of a combined image is following Date UT start, t-t0 Filter Exp. OT OT_err (mid, days) (s) 2014-10-26 18:25:48 0.7020 R 53*120 21.88 0.18 The photometry is based on USNO-B1.0 stars RA DEC R 044,065509 +26,958050 18.71 044,051792 +26,894737 18.59 044,049131 +26,929059 17.48