GRB130305A

This page lists all entries on GRB130305A in GRBweb

Summary Fermi GBM IPN Swift Fermi LAT GCN 14257 GCN 14260 GCN 14261 GCN 14262 GCN 14263 GCN 14265 GCN 14267 GCN 14268 GCN 14272 GCN 14274 GCN 14276 GCN 14277 GCN 14309 GCN 14313 GCN 14324 GCN 14326

Summary table
Variable Value Source
GRB_name_Fermi GRB130305486
T0 11:39:11 UTC Fermi_LAT
ra 116.7476° Swift
decl 52.0333° Swift
pos_error 4.92e-04° Swift
T90 25.6 s Fermi_GBM
T90_error 1.557 s Fermi_GBM
T90_start 11:39:12.649 UTC Fermi_GBM
fluence 4.65e-05 erg/cm² Fermi_GBM
fluence_error 7.18e-08 erg/cm² Fermi_GBM
T100 27.249 s
GBM_located False
mjd 56356.48554398148 Fermi_LAT
Fermi GBM table
GRB_name_Fermi GRB130305486
trigger_name bn130305486
ra 116.7650°
decl 52.0250°
pos_error 2.48e+00°
datum 2013-03-05
t_trigger 11:39:11.369 UTC
T90 25.6 s
T90_error 1.557 s
T90_start 11:39:12.649 UTC
fluence 4.65e-05 erg/cm²
fluence_error 7.18e-08 erg/cm²
flux_1024 2.68e+01 erg/cm²/s
flux_1024_error 3.76e-01 erg/cm²/s
flux_1024_time 5.18e+00 erg/cm²/s
flux_64 3.01e+01 erg/cm²/s
flux_64_error 1.54e+00 erg/cm²/s
IPN table
GRB_name GRB130305A
ra 116.7667°
decl 52.0167°
pos_error 5.00e-02°
Swift table
GRB_name GRB130305A
t_trigger 11:39:16 UTC
ra 116.7476°
decl 52.0333°
pos_error 4.92e-04°
fluence 4.80e-06 erg/cm²
Fermi LAT table
GRB_name_Fermi GRB130305486
GRB_name GRB130305A
MET 384176354.0
datum 2013-03-05
t_trigger 11:39:11 UTC
ra 116.7476°
decl 52.0333°
pos_error 1.06e-03°
GCN 14257 table
GRB_name GRB130305A
GCN_number 14257
Detection_method Swift-BAT Det
ra 116.7650°
decl 52.0250°
Circular_text TITLE: GCN CIRCULAR NUMBER: 14257 SUBJECT: GRB 130305A found in ground analysis of Swift/BAT data DATE: 13/03/05 17:49:08 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (NASA/GSFC UMBC/CRESST) and D. M. Palmer (LANL) report on behalf of the Swift/BAT team: At 11:39:16, BAT triggered on GRB 130305A (trigger #550329). No source was found on board. This burst was also detected by Fermi (trignum=384176354) and INTEGRAL (TRIGGER_NUM: 6794, Sub_Num: 0). In ground analysis of the BAT scaled-map data, a significant source was found on the edge of the BAT FOV (2.25% coded) at RA, Dec 116.765, +52.025, which is: RA (J2000) 07h 47m 03.6s Dec (J2000) 52d 01m 29s with an estimated 90% uncertainty radius of 3.5 arcmin. The GRB was a single symmetrical peak about 20 seconds long. A Swift TOO request has been approved to detect the afterglow position.
GCN 14260 table
GRB_name GRB130305A
GCN_number 14260
Detection_method Fermi LAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 14260 SUBJECT: GRB 130305A: Fermi LAT Detection DATE: 13/03/05 22:54:38 GMT FROM: Sylvain Guiriec at UAH S. Guiriec (NASA/GSFC/NPP), J. L. Racusin (NASA/GSFC), G. Vianello (Stanford) and D. Kocevski (NASA/GSFC/NPP) report on behalf of the Fermi-LAT team: The Fermi Large Area Telescope (LAT) detected emission from GRB 130305A at approximately 11:39:11 UT on March 5th, 2013, while in Target Of Opportunity (i.e., pointing) mode observing the Crab (ATEL #4855). GRB 130305A was detected by Fermi-GBM (GBM trigger 130305486/384176354) and Swift-BAT (Cummings et al., GCN #14257). The burst location was within the LAT field of view at an angle of ~41 degrees to the LAT boresight, and ~100 degrees from the zenith, placing it very close to the Earth's limb, which is a very bright source of gamma rays. No significant excess is seen using standard analysis procedures (>100 MeV) neither in the prompt phase nor in a search for extended emission when the burst position was no longer occulted from ~1500 to 5000 s. Using the non-standard LAT Low Energy (LLE) data selection, >550 counts above background were detected in a single FRED like pulse, peaking between 5 and 10 s after the GBM trigger and coinciding with the time of the GBM emission, with a significance of ~10.7 sigma. This detection is due to low energy gamma-rays, below 75 MeV, and therefore has insufficient spatial resolution to provide a reliable LAT localization. A GBM circular on GRB 130305A is forthcoming. The Fermi LAT point of contact for this burst is Sylvain Guiriec (sylvain.guiriec@nasa.gov)
GCN 14261 table
GRB_name GRB130305A
GCN_number 14261
Detection_method Fermi GBM Det
t_trigger 11:39:11.370 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 14261 SUBJECT: GRB 130305A: Fermi GBM observation DATE: 13/03/06 00:34:45 GMT FROM: Shaolin Xiong at UAH Hoi-Fung Yu (MPE) and Shaolin Xiong (UAH) report on behalf of the Fermi GBM Team: "At 11:39:11.37 UT on 05 March 2013, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 130305A (trigger 384176354 / 130305486), which was also detected by the Fermi/LAT (S. Guiriec et al., GCN 14260) and the Swift/BAT (Cummings et al., GCN 14257). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is about 44 degrees. This burst was also independently detected by INTEGRAL SPI-ACS. The GBM light curve shows single pulse with a tail with a duration (T90) of about 29 s (50-300 keV). The time-averaged spectrum from T0-0 s to T0+30 s is best fit by a Band function with Epeak = 640 +/- 23 keV, alpha = -0.67 +/- 0.02, and beta = -2.4 +/- 0.1. The event fluence (10-1000 keV) in this time interval is (5.7 +/- 0.07)E-5 erg/cm^2. The 1-sec peak photon flux measured starting from T0+5.2 s in the 10-1000 keV band is 25.4 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 14262 table
GRB_name GRB130305A
GCN_number 14262
Detection_method Konus-Wind Det
t_trigger 11:39:13.135 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 14262 SUBJECT: Konus-Wind observation of GRB 130305A DATE: 13/03/06 12:14:28 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report: The long-duration intense GRB 130305A (Swift-BAT trigger #550329: Cumings & Palmer, GCN 14257; Fermi-LAT detection: Guiriec et al., GCN 14260; Fermi-GBM observation: Yu and Xiong, GCN 14261) triggered Konus-Wind at T0=41953.135s UT (11:39:13.135) The light curve shows a bright hard pulse with a total duration of ~30 s followed by a weaker hard emission tail out to ~T0+250 s. The emission in the main bursting episode is seen up to 12 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB130305_T41953/ As observed by Konus-Wind, the main pulse had a fluence of (8.5 0.6)x10-5 erg/cm2, and a 64-ms peak flux, measured from T0+4.480 s, of (1.6 0.1)x10-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum (measured from T0 to T0+36.096 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 = -0.81 0.04, the high energy photon index beta = -2.5 0.2, the peak energy Ep = 640 45 keV, chi2 = 83.7/95 dof. The spectrum at the maximum count rate (measured from T0 to T0+11.520 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 = -0.72 0.04, the high energy photon index beta = -2.8 0.2, the peak energy Ep = 655 30 keV, chi2 = 89.5/96 dof. The spectrum of the emission tail (measured from T0+36.096 to T0+224.512 s) is best fit in the 20 keV - 10 MeV range by the simple power-law model with a rather hard photon index of (-1.4 0.1), chi2 = 71.7/89 dof. The emission in this time interval is seen up to 9 MeV and the 20 keV - 10 MeV energy fluence is (3.3 1.1)x10-5 erg/cm2. All the quoted results are preliminary.
GCN 14263 table
GRB_name GRB130305A
GCN_number 14263
Detection_method Swift-XRT Other
ra 116.7476°
decl 52.0333°
Circular_text TITLE: GCN CIRCULAR NUMBER: 14263 SUBJECT: GRB 130305A: Swift/XRT detection of the afterglow DATE: 13/03/06 15:50:04 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst Daniele Malesani (DARK/NBI), Bin-Bin Zhang (PSU), David N. Burrows (PSU), Dirk Grupe (PSU), report on behalf of the Swift-XRT team: The Swift spacecraft observed the ground-discovered BAT GRB 130305A (Cummings & Palmer, GCN 14257), also detected by Fermi GBM and LAT (Yu & Xiong, GCN 14261; Guiriec et al., GCN 14260), Konus/Wind (Golenetskii et al., GCN 14262) and INTEGRAL SPI-ACS. We have analysed 1.8 ks of XRT data, from 31.0 ks to 47.2 ks after the Swift/BAT trigger. The data are entirely in photon counting (PC) mode. An X-ray source is detected within the Swift/BAT error circle. The XRT position is RA, Dec = 116.74762, +52.03332 which is equivalent to: RA (J2000) = 07 46 59.43 Dec(J2000) = +52 01 60.0 with an uncertainty of 3.8 arcsec (radius, 90% confidence). This position is 49 arcsec from the Swift/BAT position. A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.0 (+0.7, -0.6). The best-fitting absorption column is 4.1 (+3.6, -2.5) x 10^21 cm^-2, in excess of the Galactic value of 4.8 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.3 x 10^-11 (7.3 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 4.1 (+3.6, -2.5) x 10^21 cm^-2 Galactic foreground: 4.8 x 10^20 cm^-2 Excess significance: 2.4 sigma Photon index: 2.0 (+0.7, -0.6) Further observations by Swift are ongoing. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020234. This circular is an official product of the Swift-XRT team.
GCN 14265 table
GRB_name GRB130305A
GCN_number 14265
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 14265 SUBJECT: GRB 130305A: P60 Observations DATE: 13/03/06 19:51:49 GMT FROM: S. Bradley Cenko at Caltech S. B. Cenko (UC Berkeley) reports on behalf of a larger collaboration: We imaged the location of the Swift (Cummings et al., GCN 14257), Fermi (Guiriec et al., GCN 14260; Yu et al., GCN 14261), and Konus (Golenetskii et al., GCN 14262) GRB 130305A with the robotic Palomar 60 inch telescope. Observations were obtained in the g', r', and i' filters beginning at 2:47 UT on 2013 Mar 6 (~ 15.1 hr after the Swift-BAT trigger). We do not detect any sources within the Swift-XRT error circle (Malesani et al., GCN 14263) in any filter. Using nearby point sources from SDSS for reference, we calculate limiting magnitudes of g' > 22.8, r' > 22.2, and i' > 21.7 at this time.
GCN 14267 table
GRB_name GRB130305A
GCN_number 14267
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 14267 SUBJECT: GRB 130305A: RATIR Observations DATE: 13/03/07 01:47:52 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 (UCSC), Eleonora Troja (GSFC), Enrico Ramirez-Ruiz (UCSC), Jos A. de Diego (UNAM), Leonid Georgiev (UNAM), Jess Gonzlez (UNAM), Carlos Romn-Ziga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of GRB 130305A (Cummings, et al., GCN 14257) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronmico Nacional on Sierra San Pedro Mrtir from 2013/03 6.12 to 2013/03 6.13 UTC (15.11 to 15.50 hours after the BAT trigger), obtaining a total of 0.31 hours exposure in the r' and i' bands. For a source within the Swift-XRT error circle (Malesani, et al., GCN 14263), in comparison with USNO-B1, we derive the following upper limits (3-sigma) in the AB magnitude system: r' > 23.4 i' > 23.1 These magnitudes are not corrected for Galactic extinction in the direction of the GRB. We thank the staff of the Observatorio Astronmico Nacional in San Pedro Mrtir.
GCN 14268 table
GRB_name GRB130305A
GCN_number 14268
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 14268 SUBJECT: GRB 130305A: Swift/UVOT Upper Limit DATE: 13/03/07 12:34:13 GMT FROM: Alice Breeveld at MSSL-UCL A. A. Breeveld (MSSL-UCL), Daniele Malesani (DARK/NBI), Bin-Bin Zhang (PSU), S. R. Oates (MSSL-UCL) and M. De Pasquale (MSSL-UCL) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 130305A 30975s after the BAT trigger discovered in ground analysis (Cummings et al., GCN Circ. 14257). No optical afterglow consistent with the XRT position (Malesani et al., GCN Circ. 14263) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limit 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 u 30975 59030 3890 >21.4 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 14272 table
GRB_name GRB130305A
GCN_number 14272
Detection_method Other
ra 116.7454°
decl 52.0321°
Circular_text TITLE: GCN CIRCULAR NUMBER: 14272 SUBJECT: GRB 130305A: Gemini-North upper limit DATE: 13/03/08 06:03:09 GMT FROM: Antonino Cucchiara at UCSC/UCO Lick A. Cucchiara (UCSC/UCO Lick Observatory), S. B. Cenko (UC Berkeley), D. Perley (Caltech) report on behalf of a large collaboration: "On March 7.21 UT we observed the field of GRB 130305A (Cummings & Palmer, GCN 14257; Yu & Xiong, GCN 14261; Guiriec et al., GCN 14260) with the Gemini-North telescope equipped with the GMOS camera. We obtained 14x180s exposures, for a total integration time of 42 minutes (T_mid = T0+1.70 days). No clear object is detected within the XRT error circle down to r' > 26.1 mag. Nevertheless we note the presence of several galaxies just outside the current XRT error circle (2.7 arcsec radius), in particular of a relatively bright object in the S-W direction, which seems to show a distorted morphology (https://www.dropbox.com/s/pyir6g8mqd658xn/GRB130305A.jpeg). The galaxy coordinates are RA: 07:46:58.9 (J2000) Dec: +52:01:55.72 (J2000) We thank the Gemini staff for performing this observations, in particular J. Rhee."
GCN 14274 table
GRB_name GRB130305A
GCN_number 14274
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 14274 SUBJECT: GRB 130305A: Optical Observations DATE: 13/03/08 12:03:05 GMT FROM: Shashi Bhushan Pandey at ROTSE Brajesh Kumar and S. B. Pandey (ARIES Nainital India, on behalf of larger Indian GRB collaboration). We observed the LAT detected GRB 130305A error-box (Cummings & Palmer GCN 14257; Guiriec et al. GCN 14260; Yu & Xiong GCN 14261) using 1.04m telescope at ARIES Nainital on 2013:03:05, 18:28:30 UT, ~6.8 hours after the Swift/BAT detection. Four frames in R_c pass-band 300sec each were acquired in good sky conditions. In the co-added image (4x300 sec), we did not detect any optical transient within the XRT error circle (Malesani et al. GCN 14263) down to a limiting magnitude of 21 mag. The photometry was performed in comparison to nearby USNO- B1 stars. This massage could be cited.
GCN 14276 table
GRB_name GRB130305A
GCN_number 14276
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 14276 SUBJECT: GRB 130305A: Further Swift-XRT Observations DATE: 13/03/08 16:40:57 GMT FROM: Binbin Zhang at PSU Bin-Bin Zhang (PSU), Daniele Malesani (DARK/NBI), Dirk Grupe (PSU), David N. Burrows (PSU) and Kim L. Page (U. Leicester) report on behalf of the Swift-XRT team: We have analyzed 16 ks of XRT data for the Swift/BAT-detected burst: GRB 130305A, from 31.0 ks to 210.2 ks after the Swift/BAT trigger. The data are entirely in Photon Counting (PC) mode. We confirm that the X-ray source reported in Malesani et al. GCN 1426 is fading. The light curve can be modeled with a power-law decay with a decay index of alpha=2.4 (+0.5, -0.4). The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020234. This circular is an official product of the Swift-XRT team.
GCN 14277 table
GRB_name GRB130305A
GCN_number 14277
Detection_method Swift-BAT Det
ra 116.7740°
decl 52.0370°
Circular_text TITLE: GCN CIRCULAR NUMBER: 14277 SUBJECT: GRB 130305A BAT refined circular DATE: 13/03/08 22:35:16 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), D. Malesani (DARK/NBI), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) Using 11 seconds of event data covering part of the burst, we present further analysis of GRB 130305A (Cummings and Palmer, GCN # 14257). This was a ground-detected burst on the edge of the BAT field of view. The best BAT position is RA, Dec 116.774, +52.037, which is: RA (J2000) 07h 47m 05.8s Dec (J2000) 52d 02m 11s with an estimated uncertainty radius of 1.8 arcmin (90% containment). This position is 1.0 arcmin from the XRT afterglow position (Malesani et al, GCN # 14263). The BAT mask-weighted lightcurve does not show more detail than the raw lightcurve due to the extreme partial coding (2.5%). There is a single peak, approximately symmetrical, a total of about 20 seconds long. Note, however, the much longer duration mentioned at high energy by the Konus-Wind team (Golenetskii et al., GCN # 14262. The following spectral results appear to cover about 90% of the total flux of the burst, based on the raw lightcurve excess over constant background. Again, the partial coding makes the uncertainty of the fit parameters large. A fit to a simple power law function has a photon index of 0.78 +/- 0.20. This is harder than most other BAT-detected long GRBs. The fluence from 15-150 keV was (4.8 +/- 1.8) x 10^-6 ergs/cm^2. [GCN OPS NOTE(08mar13): Per author's request, the word "draft" was removed from the Subject-line.]
GCN 14309 table
GRB_name GRB130305A
GCN_number 14309
Detection_method Konus-Wind Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 14309 SUBJECT: GRB 130305A: TLS Tautenburg observations DATE: 13/03/15 00:20:12 GMT FROM: Alexander Kann at TLS Tautenburg B. Stecklum, D. A. Kann and C. Hoegner (TLS Tautenburg) report: Following the announcement of the ground-detection of the bright GRB 130305A by Swift BAT (Cummings & Palmer 2013, GCN 14257), which was also detected by Fermi LAT (Guiriec et al. 2013, GCN 14260), Fermi GBM (Yu & Xiong 2013, GCN 14261) and Konus-Wind (Golenetskii et al. 2013, GCN 14262), we initiated observations with the 1.34m Schmidt telescope of the Thueringer Landessternwarte Tautenburg under excellent weather conditions at 18:11 UT, 22 minutes after the GCN notice. We obtained 6 x 600 sec exposures in the Rc band, centered 0.29299 days after the GRB. At the position of the XRT afterglow (Malesani et al. 2013, GCN 14263, Zhang et al. 2013, GCN 14276), we detect no source down to a 2 sigma upper limit of Rc > 23.2. Photometric calibration was obtained with respect to several SDSS stars in the field, using the transformations of Lupton (2005). This upper limit is deeper than the one obtained by Kumar & Pandey (2013, GCN 14274) at a similar time and earlier than several other reported observations (Cenko 2013, GCN 14265; Butler et al. 2013, GCN 14267; Breeveld et al. 2013, GCN 14268). We detect all the surrounding sources seen in the deep Gemini image (Cucchiara et al. 2013, GCN 14272). A second observation was attempted a day later, but due to inclement weather conditions only a single 600 sec image could be successfully obtained. It is significantly shallower than the stack of the first night and shows no changes. This message may be cited.
GCN 14313 table
GRB_name GRB130305A
GCN_number 14313
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 14313 SUBJECT: GRB 130305A: PTF P48 optical upper limits DATE: 13/03/15 19:28:32 GMT FROM: Leo Singer at CIT/PTF L. P. Singer (Caltech), S. B. Cenko (UC Berkeley), and D. A. Brown (Syracuse) report on behalf of a larger collaboration: We have imaged the 3-sigma Swift XRT error circle (D. Malesani, GCN 14263) of GRB130305A (Fermi384176354, J. R. Cummings, GCN 14257) with the Palomar 48 inch Oschin telescope (P48) as part of the Palomar Transient Factory (PTF). Images were obtained in the Mould R filter at 2013-03-06 at 05:13:35 and 05:56:17 UTC, 17.6 and 18.3 hours after the trigger. We find no point source, fading or otherwise, to 5-sigma limiting magnitudes of 20.8 and 20.8.
GCN 14324 table
GRB_name GRB130305A
GCN_number 14324
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 14324 SUBJECT: GRB 130305A: optical upper limit in Mondy observatory DATE: 13/03/17 15:30:22 GMT FROM: Alexei Pozanenko at IKI, Moscow A.Volnova (SAI MSU/IKI), R. Burenin(IKI), E. Klunko (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed We imaged the location of the Swift (Cummings et al., GCN 14257), Fermi (Guiriec et al., GCN 14260; Yu et al., GCN 14261), and Konus (Golenetskii et al., GCN 14262) GRB 130305A with AZT-33IK telescope of Sayan observatory (Mondy) on March 05 between (UT) 20:44:08 - 22:17:04. We took several images in R-filter of 100 s exposure under unfavorable seeing (FWHM) of about 4.2 arcsec. We do not detect any sources within the XRT error circle (Malesani et al., GCN 14263). A photometry of a combined image is following UT start, t-t0 Filter Exp. OT UL (3 sigma) (mid, days) (s) 20:44:08 0.41071 R 35x100 n/d 21.4 The photometry is based on SDSS DR8 star SDSS J074702.42+520103.3 07:47:02.43 +52:01:03.4 R = 16.94
GCN 14326 table
GRB_name GRB130305A
GCN_number 14326
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 14326 SUBJECT: GRB 130305A: Gemini follow-up observations DATE: 13/03/21 22:13:43 GMT FROM: Antonino Cucchiara at UCSC/UCO Lick A. Cucchiara (UCSC/UCO Lick Observatory), S. B. Cenko (UC Berkeley), D. Perley (Caltech) report on behalf of a large collaboration: "On March 20.31 UT we observed again the field of GRB 130305A (Cummings & Palmer, GCN 14257; Yu & Xiong, GCN 14261; Guiriec et al., GCN 14260) with the Gemini-North telescope equipped with the GMOS camera. We obtained 7x180s exposures, for a total integration time of 21 minutes (T_mid = T0+13.10 days). We compared the coadded image with our pervious observation (Cucchiara et al. GCN 14272) and performed an image subtraction between the two epochs. No variable source appears in the subtraction image, in particular we note that the galaxy reported in GCN 14272 appears of constant brightness. We estimated a limiting magnitude of r' > 26.0 within the XRT circle. We thank the Gemini staff for performing this observation.