GRB150222A

This page lists all entries on GRB150222A in GRBweb

Summary IPN Swift GCN 17486 GCN 17487 GCN 17488 GCN 17489 GCN 17491 GCN 17493 GCN 17494 GCN 17495 GCN 17498 GCN 17499 GCN 17500 GCN 17506 GCN 17567

Summary table
Variable Value Source
T0 16:56:40 UTC GCN_circulars,Swift Det
ra 198.7865° Swift
decl -12.1520° Swift
pos_error 2.20e-04° Swift
T90 15.9 s Swift
T90_start 16:56:40 UTC Swift
fluence 2.20e-06 erg/cm² Swift
T100 15.9 s
GBM_located False
mjd 57075.70601851852 GCN_circulars,Swift Det
IPN table
GRB_name GRB150222A
ra 198.7750°
decl -12.1333°
pos_error 5.00e-02°
Swift table
GRB_name GRB150222A
t_trigger 16:56:40 UTC
ra 198.7865°
decl -12.1520°
pos_error 2.20e-04°
T90 15.9 s
fluence 2.20e-06 erg/cm²
GCN 17486 table
GRB_name GRB150222A
GCN_number 17486
Detection_method Swift Det
t_trigger 16:56:40 UTC
ra 198.7740°
decl -12.1370°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17486 SUBJECT: GRB 150222A: Swift detection of a burst DATE: 15/02/22 17:11:54 GMT FROM: David Palmer at LANL M. G. Bernardini (INAF-OAB), S. D. Barthelmy (GSFC), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), A. Melandri (INAF-OAB), D. M. Palmer (LANL) and B. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift Team: At 16:56:40 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150222A (trigger=632180). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 198.774, -12.137 which is RA(J2000) = 13h 15m 06s Dec(J2000) = -12d 08' 11" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multiple-peaked structure with a duration of about 15 sec. The peak count rate was ~6000 counts/sec (15-350 keV), at ~6 sec after the trigger. The XRT began observing the field at 16:58:13.6 UT, 92.8 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 198.7865, -12.1517 which is equivalent to: RA(J2000) = 13h 15m 08.76s Dec(J2000) = -12d 09' 06.3" with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 68 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 (3.31 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 4.9 (+2.52/-2.21) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 150 seconds with the White filter starting 96 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 0.05. Burst Advocate for this burst is M. G. Bernardini (grazia.bernardini AT brera.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 17487 table
GRB_name GRB150222A
GCN_number 17487
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17487 SUBJECT: GRB 150222A: MASTER early optical observations DATE: 15/02/22 17:19:12 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 GRB150222A 58 sec after notice time and 76 sec after trigger time at 2015-02-22 16:57:57 UT in two polarizations. On our first (10s exposure) set we haven't found optical transient within SWIFT error-box (Bernardini et. al GCN 17486). The 5-sigma upper limit has been about 15.5 mag The observations made on high zenith distance (z=75 d). The message may be cited.
GCN 17488 table
GRB_name GRB150222A
GCN_number 17488
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17488 SUBJECT: GRB 150222A: Zadko observatory - Gingin optical observations DATE: 15/02/22 20:32:04 GMT FROM: Alain Klotz at IRAP-CNRS-OMP A. Klotz, D. Turpin (IRAP-CNRS-OMP), D. Macpherson (UWA/ICRAR), D. Coward (UWA), M. Boer, B. Gendre, K. Siellez, H. Dereli, O. Bardho (UNS-CNRS-OCA), A. Williams (PO-UWA), R. Martin (PO-UWA) report: We imaged the field of GRB 150222A detected by SWIFT (trigger 632180) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia. The observations started 55s after the GRB trigger (42s after the notice). The elevation of the field increased from 51 degrees above horizon and weather conditions were very good. The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We do not detect any OT at the XRT position (Bernardini et al. GCNC 17486) with a limiting magnitude of: t0+55s to t0+115s : Rlim = 18.5 The second image is 30.0s exposure in tracking mode: t0+134s to t0+164s : Rlim = 19.8 We co-added a series of exposures: t0+134s to t0+834s : Rlim = 21.5 Magnitudes were estimated with the nearby NOMAD1 stars and are not corrected for galactic dust extinction.
GCN 17489 table
GRB_name GRB150222A
GCN_number 17489
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17489 SUBJECT: GRB 150222A: Mondy optical observations DATE: 15/02/22 22:42:58 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 150222A (Bernardini et al., GCN 17486) with AZT-33IK telescope of Sayan observatory (Mondy) starting on Feb., 22 (UT) 17:48:56. We obtained 37 images in R-filter of 120 s exposure. Within the Swift-XRT error circle (Bernardini et al., GCN 17486) we marginally detected optical source with a magnitude of R=22.15+/-0.25 at 0.06201 days after trigger (mid time). Photometry of the source is based on nearby USNO-B1.0 (R2) stars. At this time we cannot confirm variability or fading nature of the source.
GCN 17491 table
GRB_name GRB150222A
GCN_number 17491
Detection_method Swift-BAT Det
ra 198.7870°
decl -12.1510°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17491 SUBJECT: GRB 150222A: Swift-BAT refined analysis DATE: 15/02/23 01:16:22 GMT FROM: Hans Krimm at NASA-GSFC C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), M. G. Bernardini (INAF-OAB), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-60 to T+117 sec from the recent telemetry downlink, we report further analysis of BAT GRB 150222A (trigger #632180) (Bernardini, et al., GCN Circ. 17486). The BAT ground-calculated position is RA, Dec = 198.787, -12.151 deg which is RA(J2000) = 13h 15m 09.0s Dec(J2000) = -12d 09' 02.0" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 48%. The mask-weighted light curve shows a double-peaked structure, with a first peak from T+0 to T+3 sec and a second, larger peak from T+3 to T+18 sec, followed by lower level emission out to ~T+40 sec. T90 (15-350 keV) is 15.90 +- 7.32 sec (estimated error including systematics). The time-averaged spectrum from T-0.14 to T+28.11 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.61 +- 0.08. The fluence in the 15-150 keV band is 2.2 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+5.62 sec in the 15-150 keV band is 4.7 +- 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/632180/BA/
GCN 17493 table
GRB_name GRB150222A
GCN_number 17493
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17493 SUBJECT: GRB 150222A: TNG optical observations DATE: 15/02/23 02:32:04 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst D. Malesani (DARK/NBI), V. D'Elia (INAF/OAR and ASI/ASDC), P. D'Avanzo (INAF/OABr), A. Melandri (INAF/OABr), S. Covino (INAF/OABr), V. Lorenzi (INAF/TNG), Albar Garcia de Gurtubai Escudero (INAF/TNG), report on behalf of the CIBO collaboration: We observed the field of GRB 150222A (Bernardini et al., GCN 17486) with the 3.6m TNG telescope equipped with the DOLoRes camera. Observations consisted of 4 images in the I band for a total of 20 min exposure. The seeing was poor (3.2"). No object is detected within the (currently unenhanced) XRT position, down to a limiting magnitude I > 22.3 (calibrated against nearby USNO stars). The mean time of the observation was 2015 Feb 23.055 UT, that is 8.4 hr after the GRB.
GCN 17494 table
GRB_name GRB150222A
GCN_number 17494
Detection_method Swift-XRT Det
ra 198.7865°
decl -12.1520°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17494 SUBJECT: GRB 150222A: Enhanced Swift-XRT position DATE: 15/02/23 04:13:26 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 3503 s of XRT Photon Counting mode data and 6 UVOT images for GRB 150222A, 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 = 198.78648, -12.15200 which is equivalent to: RA (J2000): 13h 15m 8.75s Dec (J2000): -12d 09' 07.2" with an uncertainty of 1.7 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 17495 table
GRB_name GRB150222A
GCN_number 17495
Detection_method Optical
ra 198.7865°
decl -12.1517°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17495 SUBJECT: GRB 150222A: GROND optical afterglow candidate DATE: 15/02/23 07:15:01 GMT FROM: Ana Nicuesa at TLS Tautenburg A. Nicuesa Guelbenzu (TLS Tautenburg), P. Wiseman (MPE Garching), and J. Greiner (MPE Garching) report: We observed the field of GRB 150222A (Swift trigger 632180; Bernardini et al., GCN 17486) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla Observatory (Chile). Observations started at 03:39:15 UT on February 23, about 10 hours after the GRB trigger. Inside the enhanced X-ray error circle (Beardmore et al., GCN 17494) we detect a faint source at coordinates RA, DEC (J2000) = 13:15:08.75, -12:09:06.2 with an error of 0".5. At a mean time of February 23, at 04:39:07 UT, we measure the following preliminary AB magnitude: g' = 24.8 +/- 0.2. r' = 24.6 +/- 0.3. At present we cannot decide if this is the afterglow. Observations are ongoing. Magnitudes are calibrated against GROND zeropoints (g'r'i'z') and are not corrected for the Galactic extinction in the direction of the burst.
GCN 17498 table
GRB_name GRB150222A
GCN_number 17498
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17498 SUBJECT: GRB 150222A: Swift-XRT refined Analysis DATE: 15/02/23 11:26:27 GMT FROM: Maria Grazia Bernardini at INAF/Brera C. Pagani (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), M. de Pasquale (INAF-IASFPA), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester) and M. G. Bernardini (INAF-OAB) report on behalf of the Swift-XRT team: We have analysed 6.7 ks of XRT data for GRB 150222A (Bernardini et al. GCN Circ. 17486), from 76 s to 44.7 ks after the BAT trigger. The data comprise 221 s in Windowed Timing (WT) mode (the first 10 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. 17494). The light curve can be modelled with a power-law decay with a decay index of alpha=0.95 (+/-0.03). Some flaring activity is observed between T+250 s and T+650 s. A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.51 (+0.12, -0.11). The best-fitting absorption column is 4.7 (+/-0.5) x 10^21 cm^-2, in excess of the Galactic value of 3.3 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.45 (+0.19, -0.18) and a best-fitting absorption column of 5.8 (+1.0, -0.9) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.4 x 10^-11 (7.9 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 5.8 (+1.0, -0.9) x 10^21 cm^-2 Galactic foreground: 3.3 x 10^20 cm^-2 Excess significance: 10.0 sigma Photon index: 2.45 (+0.19, -0.18) If the light curve continues to decay with a power-law decay index of 0.95, the count rate at T+24 hours will be 9.9 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.3 x 10^-13 (7.8 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00632180. This circular is an official product of the Swift-XRT team.
GCN 17499 table
GRB_name GRB150222A
GCN_number 17499
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17499 SUBJECT: GRB 150222A: Swift/UVOT Upper Limits DATE: 15/02/23 12:43:28 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin (UCL-MSSL) and M. G. Bernardini (INAF-OAB) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 150222A 96 s after the BAT trigger (Bernardini et al., GCN Circ. 17486). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 17494) 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 96 246 147 >20.8 u_FC 308 558 246 >20.7 white 96 6906 746 >21.3 v 639 5881 274 >19.9 b 564 6702 452 >20.9 u 308 6496 678 >20.8 w1 689 6292 432 >20.0 m2 836 6086 413 >20.4 w2 1019 6994 297 >20.5 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.05 in the direction of the burst (Schlegel et al. 1998).
GCN 17500 table
GRB_name GRB150222A
GCN_number 17500
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17500 SUBJECT: GRB 150222A: I-band observations from OSN DATE: 15/02/23 13:41:59 GMT FROM: Antonio de Ugarte Postigo at IAA-CSIC Antonio de Ugarte Postigo (IAA-CSIC, DARK/NBI), Christina Thoene (IAA-CSIC), and Victor Casanova (IAA-CSIC) report on behalf of a larger collaboration: We observed the field of GRB 150222A (Bernardini et al., GCN 17486) with the 1.5 m telescope at Sierra Nevada Observatory (Granada, Spain). Observations consisted of 34x300s in I-band and ranged from 2:46 to 5:44 UT (mid epoch at 4:15 UT, or 11.31 hr after the burst trigger). Observing conditions were poor, with a seeing of 2.9". We do not detect the optical counterpart candidate reported by Mazaeva et al. (GCN 17489) and Nicuesa Guelbenzu et al. (GCN 17495) or any other object within the enhanced XRT error circle (Beardmore et al. GCN 17494). The 3-sigma limit of the combined image is I(Vega) = 22.5 mag, as compared with USNOB-1.0 stars. Considering an optical decay slope of alpha ~ 1.1 (where F_nu ~ t^(-alpha)) between the epochs of Mazaeva et al. and Nicuesa Guelbenzu et al., and a typical GRB colour, our observation is consistent with the expected brightness and is also consistent with the non-detections reported by other groups (Ivanov et al. GCN 17487; Klotz et al. GCN 17488; Malesani et al. GCN 17493; Kuin et al. GCN 17499)
GCN 17506 table
GRB_name GRB150222A
GCN_number 17506
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 17506 SUBJECT: GRB 150222A: Further GROND Observations DATE: 15/02/26 14:45:45 GMT FROM: Philip Wiseman at MPE/Swift A. Nicuesa Guelbenzu (TLS Tautenburg), P. Wiseman, P. Schady and J. Greiner (all MPE Garching) report on behalf of the GROND team: We continued to observe the field of GRB 150222A (Swift trigger 632180; Bernadini et al., GCN 17486) for a second night, 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 began at 06:25:38 UT on February 24, ~34 hours after the GRB trigger. They were performed at an average seeing of 1.3" and at an average airmass of 1.1//. In 106 min of total exposures in g'r'i'z', we detect a source in all optical bands towards the north-eastern edge of the the 1.7" enhanced Swift-XRT error circle (Beardmore et al., GCN 17494) , at a position consistent with that reported in Nicuesa Guelbenzu et al. (GCN 17495). In 115 min of total NIR exposures in the JHK bands, no source is detected within the enhanced XRT error circle. We detect no fading of the source between the two epochs, and therefore suggest that this is not the afterglow, but could be the host galaxy instead, unless we caught an afterglow plateau phase.
GCN 17567 table
GRB_name GRB150222A
GCN_number 17567
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17567 SUBJECT: GRB 150222A: CrAO optical observation DATE: 15/03/11 21:13:05 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: We observed the field of the Swift GRB GRB 150222A (Bernardini et al., GCN 17486) with ZTSh telescope of CrAO observatory starting on Feb. 22 (UT) 23:19:54. We took several images in R-filter of 120 s exposure under non-optimal weather conditions and mean seeing of 4". Within enhanced XRT position (Beardmore et al., GCN 17494) we detect a source in coordinates (J2000) 13 15 08.74 -12 09 07.2 with uncertainty of 0.4 arcsec in both coordinates. The source position is coincident with the optical afterglow candidate (Nicuesa Guelbenzu et al., GCNs 17495, GCN 17506). Photometry of the source in a combined image is following Date UT start, t-t0 Filter Exp. OT OT_err UL(3sigma) (mid, days) (s) 2015-02-22 23:19:54 0.2913 R 34*120 23.0 0.3 23.3 The photometry is based on USNO-B1.0 star 0778-0337957 (J2000) 13 15 05.41 -12 08 17.5 assuming R2=15.31 Taking into account photometry of the source r' = 24.6+/-0.3 at ~0.42 days reported by Nicuesa Guelbenzu et al. (GCN 17495) one could suggest the source is the optical afterglow of GRB 150222A. The source reported in GCN 17489 (Mazaeva et al) is clearly visible in coordinates (J2000) 13 15 08.30 -12 08 57.5 with uncertainty of 0.4 arcsec in both coordinates. A photometry of the source is R=22.12+/-0.12.