GRB150211A

This page lists all entries on GRB150211A in GRBweb

Summary IPN Swift GCN 17433 GCN 17434 GCN 17435 GCN 17436 GCN 17437 GCN 17442 GCN 17443 GCN 17444 GCN 17445 GCN 17447 GCN 17448 GCN 17450 GCN 17461

Summary table
Variable Value Source
T0 11:52:08.740 UTC GCN_circulars,Konus-Wind Det
ra 254.8592° Swift
decl 55.3934° Swift
pos_error 2.07e-04° Swift
T90 13.6 s Swift
T90_start 11:52:11 UTC Swift
T100 15.86 s
GBM_located False
mjd 57064.494545601854 GCN_circulars,Konus-Wind Det
IPN table
GRB_name GRB150211A
ra 254.8542°
decl 55.3833°
pos_error 5.00e-02°
Swift table
GRB_name GRB150211A
t_trigger 11:52:11 UTC
ra 254.8592°
decl 55.3934°
pos_error 2.07e-04°
T90 13.6 s
GCN 17433 table
GRB_name GRB150211A
GCN_number 17433
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17433 SUBJECT: GRB 150211A: MASTER early optical observations DATE: 15/02/11 12:03:20 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University 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 V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinsky, I.Zalozhnih, A. Popov Ural Federal University, Yekaterinburg, Kourovka D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory 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 Tunka was pointed to the GRB150211A 39 sec after notice time and 55 sec after trigger time at 2015-02-11 11:53:08 UT in two polarizations. On our first (10s exposure) set we haven't found optical transient within SWIFT error-box (ra=16 59 25 dec=+55 22 58 r=0.050000). The 5-sigma upper limit has been about 15.5 mag The position hava a high (z~75d) zenith distance. The observation and data reductions is continued. The message may be cited.
GCN 17434 table
GRB_name GRB150211A
GCN_number 17434
Detection_method Swift Det
t_trigger 11:52:11 UTC
ra 254.8560°
decl 55.3830°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17434 SUBJECT: GRB 150211A: Swift detection of a burst DATE: 15/02/11 12:09:47 GMT FROM: Scott Barthelmy at NASA/GSFC R. L. C. Starling (U Leicester), S. D. Barthelmy (GSFC), M. M. Chester (PSU), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU) and K. L. Page (U Leicester) report on behalf of the Swift Team: At 11:52:11 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150211A (trigger=630714). Swift did not slew because of observing constraint. The BAT on-board calculated location is RA, Dec 254.856, +55.383, which is RA(J2000) = 16h 59m 25s Dec(J2000) = +55d 22' 59" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows several overlapping peaks structure with a total duration of about 20 sec. The peak count rate was ~7000 counts/sec (15-350 keV), at ~4 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+33.7 minutes. There will be no XRT or UVOT data until this time. The star tracker lost lock about 1 minute before the trigger, but the location should be good by propagating the gyros. INTEGRAL-SPIACS also saw this burst. Burst Advocate for this burst is R. L. C. Starling (rlcs1 AT star.le.ac.uk). 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 17435 table
GRB_name GRB150211A
GCN_number 17435
Detection_method Swift-XRT Other
ra 254.8586°
decl 55.3924°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17435 SUBJECT: GRB 150211A: Swift-XRT observations DATE: 15/02/11 12:54:45 GMT FROM: Phil Evans at U of Leicester S. Campana (INAF-OAB), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), D.N. Burrows (PSU), J.A. Kennea (PSU) and G. Tagliaferri (INAF-OAB) report on behalf of the Swift-XRT team: The XRT began observing the field of GRB 150211A at 12:27:22.5 UT, 2111.0 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 254.85863, 55.39235 which is equivalent to: RA(J2000) = 16h 59m 26.07s Dec(J2000) = +55d 23' 32.5" with an uncertainty of 3.6 arcseconds (radius, 90% containment). This location is 34 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 (1.61 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 5.1 (+2.58/-2.25) x 10^21 cm^-2 (90% confidence).
GCN 17436 table
GRB_name GRB150211A
GCN_number 17436
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17436 SUBJECT: GRB 150211A: No afterglow detection in the Swift/UVOT initial observation DATE: 15/02/11 13:04:55 GMT FROM: Margaret Chester at PSU M. M. Chester (Penn State) and R. L. C. Starling (U. Leicester) report on behalf of the Swift/UVOT team: UVOT took a finding chart exposure of 150 seconds with the White filter starting 2115 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 0.02.
GCN 17437 table
GRB_name GRB150211A
GCN_number 17437
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17437 SUBJECT: GRB 150211A: RATIR Optical and NIR Observations DATE: 15/02/11 13:41:02 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 observed the field of GRB 150211A (Starling, et al., GCN 17434) 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 2015/02 11.50 to 2015/02 11.53 UTC (0.05 to 1.29 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 (Campana, et al., GCN 17435), in comparison with USNO-B1 and 2MASS, we obtain the following upper limits (3-sigma): r > 23.34 i > 23.71 z > 20.21 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. These upper limits are consistent with observations by the Swift-UVOT (Chester, et al, GCN 17436) and MASTER II robotic telescope (Ivanov, et al, GCN 17433). We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
GCN 17442 table
GRB_name GRB150211A
GCN_number 17442
Detection_method Swift-XRT Other
ra 254.8581°
decl 55.3927°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17442 SUBJECT: GRB 150211A: Swift-XRT refined Analysis DATE: 15/02/11 17:05:56 GMT FROM: Rhaana Starling at U of Leicester R. L. C. Starling (U Leicester) reports on behalf of the Swift-XRT team: We have analysed 837 s of XRT data for GRB 150211A (Starling et al. GCN Circ. 17434), from 2.1 ks to 3.0 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The refined XRT position is RA, Dec = 254.8581, +55.3927 which is equivalent to: RA (J2000): 16 59 25.94 Dec(J2000): +55 23 33.5 with an uncertainty of 3.6 arcsec (radius, 90% confidence). The light curve can be modelled with a power-law decay with a decay index of alpha=1.0 (+/-0.9). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.83 (+0.21, -0.20). The best-fitting absorption column is 6.2 (+1.6, -1.4) x 10^21 cm^-2, in excess of the Galactic value of 1.6 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 4.7 x 10^-11 (7.2 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 6.2 (+1.6, -1.4) x 10^21 cm^-2 Galactic foreground: 1.6 x 10^20 cm^-2 Excess significance: 7.1 sigma Photon index: 1.83 (+0.21, -0.20) If the light curve continues to decay with a power-law decay index of 1.0, the count rate at T+24 hours will be 0.029 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.4 x 10^-12 (2.1 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/00630714. This circular is an official product of the Swift-XRT team.
GCN 17443 table
GRB_name GRB150211A
GCN_number 17443
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17443 SUBJECT: GRB 150211A: Mondy optical upper limit DATE: 15/02/11 19:32:58 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Volnova (IKI), E. Klunko (ISTP), I. Korobtsev (ISTP), M. Eselevich (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 150211A (Starling, et al., GCN 17434) with AZT-33IK telescope of Sayan observatory (Mondy). We obtained several images in R-filter on Feb., 11, starting (UT) 12:02:35. Within XRT error cirvle (Campana, et al.,GCN 17435) we do not detect any optical source. Upper limit is following Date UT start t-T0 Filter Exp. UL(3sigma) (mid, days) (s) 2015-02-11 12:02:35 0.03091 R 1800 21.9 The photometry is based on nearby USNO-B1.0 stars: USNO-B1.0_id R2 1453-0255559 18.45 1453-0255560 18.27 1453-0255536 18.49
GCN 17444 table
GRB_name GRB150211A
GCN_number 17444
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17444 SUBJECT: GRB 150211A: KAIT Optical Upper Limit DATE: 15/02/11 19:46:58 GMT FROM: Weikang Zheng at UC Berkeley WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on behalf of the KAIT GRB team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to Swift GRB 150211A (Starling al., GCN 17434) starting at 11:54:12 UT, 121 s after the burst. Observations were performed with an automatic sequence in the clear (roughly R), V, and I filters, and the exposure time was 20 s per image. We do not detect any new source in our images within the refined XRT error circle (Starling et al., GCN 17442). The typical limiting magnitude of our single clear image is about 18.0 calibrated to USNO B1.0.
GCN 17445 table
GRB_name GRB150211A
GCN_number 17445
Detection_method Swift-BAT Det
ra 254.8460°
decl 55.3900°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17445 SUBJECT: GRB 150211A: Swift-BAT refined analysis DATE: 15/02/11 20:35:19 GMT FROM: Scott Barthelmy at NASA/GSFC W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), 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), R. L. C. Starling (U Leicester), J. Tueller (GSFC), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-61 to T+242 sec from recent telemetry downlinks, we report further analysis of BAT GRB 150211A (trigger #630714) (Starling, et al., GCN Circ. 17434). The BAT ground-calculated position is RA, Dec = 254.846, 55.390 deg, which is RA(J2000) = 16h 59m 23.0s Dec(J2000) = +55d 23' 23.2" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 16%. The mask-weighted light curve shows several overlapping peaks starting at ~T-10 sec, peaking at ~T+5 sec, and ending at ~T+30 sec. T90 (15-350 keV) is 13.6 +- 2.0 sec (estimated error including systematics). The time-averaged spectrum from T-11.24 to T+9.18 sec is best fit by a Double Blackbody. This fit gives a kT1 = 7.99 +2.8/-2.1 keV, kT2 = 24.7 +7.5/-3.2 keV, and (R1/D10)^2 = 6.0 +9.1/-3.3 and R2/D10)^2 = 0.22 +0.11/-0.15. (chi squared 74.8 for 59 d.o.f.). For this model the total fluence in the 15-150 keV band is 9.9 +- 1.2 x 10^-7 erg/cm2 and the 1-sec peak flux measured from T+4.36 sec in the 15-150 keV band is 12 +- 1 ph/cm2/sec. A Cutoff PL has an Epeak of 123.4 +- 27.5 keV (chi squared 81.8 for 56 d.o.f.). And for completeness, the fit to a simple power law gives a photon index of 1.28 +- 0.05 (chi squared 107 for 57 d.o.f.). 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/630714/BA/
GCN 17447 table
GRB_name GRB150211A
GCN_number 17447
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17447 SUBJECT: GRB 150211A: Swift/UVOT Upper Limits DATE: 15/02/12 02:35:34 GMT FROM: Margaret Chester at PSU M. M. Chester (Penn State) and R. L. C. Starling (U Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 150211A 2116 s after the BAT trigger (Starling et al., GCN Circ. 17434). No optical afterglow consistent with the XRT position (Starling GCN Circ. 17442) 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 2116 2266 147 >21.3 white 2116 3123 383 >21.8 v 2272 8220 255 >20.4 b 2371 2918 236 >20.1 u 2346 2713 58 >19.7 w1 2321 2688 58 >19.4 m2 8225 8421 193 >20.4 w2 3129 3243 112 >19.9 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN 17448 table
GRB_name GRB150211A
GCN_number 17448
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17448 SUBJECT: GRB 150211A iTelescope observation DATE: 15/02/12 07:54:47 GMT FROM: Takanori Sakamoto at AGU D. Kawamura, T. Sakamoto, A. Yoshida (AGU) We observed the field of GRB 150211A detected by Swift (trigger #630714; Starling et al., GCN Circ. 17434) with the iTelescope.Net (http://www.itelescope.net) T11 (0.50 m Plane Wave) telescope located at the New Mexico Skies Observatory (NM, USA). 20 images of 60 sec exposures were taken in the R filter starting from February 11 12:06:11 (UT) about 14.3 minutes after the trigger and stopped on February 11 12:32:17 (UT). We do not detect the optical afterglow both in the individual images and the stacked image at the enhanced X-ray afterglow position (Starling et al., GCN Circ. 17442). The estimated five sigma upper limit of the combined image (total exposure of 1200 sec) is ~19.1 using the USNO-B1 catalog.
GCN 17450 table
GRB_name GRB150211A
GCN_number 17450
Detection_method Konus-Wind Det
t_trigger 11:52:08.740 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 17450 SUBJECT: Konus-Wind observation of GRB 150211A DATE: 15/02/12 11:45:42 GMT FROM: Dmitry Frederiks 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: The long-duration GRB 150211A (Swift-BAT trigger #630714: Starling et al., GCN 17434) triggered Konus-Wind at T0=42728.740 s UT (11:52:08.740). The KW light curve shows a single multi-peaked emission episode with a duration of ~13 s. The emission is visible up to ~10 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB150211_T42728/ As observed by Konus-Wind, the burst had a fluence of 2.4(-0.3,+0.3)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+7.808 s, of 5.6(-0.7,+0.7)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum (measured from T0 to T0+16.128 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.62 (-0.20,+0.25), the high energy photon index beta = -2.07 (-0.15,+0.10), the peak energy Ep = 145 (-24,+30) keV, chi2 = 114/97 dof. All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN 17461 table
GRB_name GRB150211A
GCN_number 17461
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17461 SUBJECT: GRB 150211A: ROTSE-III Upper Optical Limit DATE: 15/02/12 22:49:20 GMT FROM: Farley V. Ferrante at Southern Methodist U/ROTSE F. V. Ferrante (SMU), T. Guver (Istanbul U), G. Dhungana (SMU), R. Staten (SMU) and R. Kehoe (SMU) report on behalf of the ROTSE GRB team: The 0.45-m ROTSE-IIIb telescope, located at McDonald Observatory, Texas, responded to GRB 150211A (Swift trigger 630714; Starling, et al.,GCN 17434) with imaging beginning 3.8 s after the GCN notice time. An automated response recorded the first image at 11:52:43.8 UT, 30.7 s after the burst, under fair observing conditions. The unfiltered images are calibrated relative to USNO A2.0 (R). We do not detect an optical source within the refined Swift-XRT error circle (Starling et al., GCN 17442). We set the following upper limit: start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd? ----------------------------------------------------------------------------------------------- 11:52:43.8 11:53:43.8 60 17.6 30.7 N