GRB100728B

This page lists all entries on GRB100728B in GRBweb

Summary Fermi GBM IPN Swift GCN 11009 GCN 11010 GCN 11011 GCN 11012 GCN 11013 GCN 11015 GCN 11017 GCN 11022 GCN 11023 GCN 11024 GCN 11025 GCN 11026 GCN 11027 GCN 11028 GCN 11029 GCN 11045 GCN 11317

Summary table
Variable Value Source
GRB_name_Fermi GRB100728439
T0 10:31:52.926 UTC Fermi_GBM
ra 44.0561° Swift
decl 0.2812° Swift
pos_error 6.73e-05° Swift
T90 10.24 s Fermi_GBM
T90_error 1.846 s Fermi_GBM
T90_start 10:31:52.926 UTC Fermi_GBM
fluence 3.34e-06 erg/cm² Fermi_GBM
fluence_error 6.47e-08 erg/cm² Fermi_GBM
redshift 2.4530
T100 14.174 s
GBM_located False
mjd 55405.43880701389 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB100728439
trigger_name bn100728439
ra 44.0529°
decl 0.2800°
pos_error 3.83e+00°
datum 2010-07-28
t_trigger 10:31:54.974 UTC
T90 10.24 s
T90_error 1.846 s
T90_start 10:31:52.926 UTC
fluence 3.34e-06 erg/cm²
fluence_error 6.47e-08 erg/cm²
flux_1024 6.15e+00 erg/cm²/s
flux_1024_error 2.72e-01 erg/cm²/s
flux_1024_time 1.22e+00 erg/cm²/s
flux_64 8.42e+00 erg/cm²/s
flux_64_error 1.27e+00 erg/cm²/s
IPN table
GRB_name GRB100728B
ra 44.0542°
decl 0.2833°
pos_error 5.00e-02°
redshift 2.1060
Swift table
GRB_name GRB100728B
t_trigger 10:31:55 UTC
ra 44.0561°
decl 0.2812°
pos_error 6.73e-05°
T90 12.1 s
fluence 1.70e-06 erg/cm²
redshift 2.8000
GCN 11009 table
GRB_name GRB100728B
GCN_number 11009
Detection_method Swift Det
t_trigger 10:31:55 UTC
ra 44.0530°
decl 0.2800°
Circular_text TITLE: GCN CIRCULAR NUMBER: 11009 SUBJECT: GRB 100728B: Swift detection of a burst with an optical counterpart DATE: 10/07/28 11:42:40 GMT FROM: Kim Page at U.of Leicester D. C. Morris (GWU/GSFC), A. P. Beardmore (U Leicester), V. D'Elia (ASDC), P. A. Evans (U Leicester), J. M. Gelbord (PSU), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), H. A. Krimm (CRESST/GSFC/USRA), O. M. Littlejohns (U Leicester), C. B. Markwardt (CRESST/GSFC/UMD), J. P. Osborne (U Leicester), C. Pagani (U Leicester), K. L. Page (U Leicester), A. Rowlinson (U Leicester), B. Sbarufatti (INAF-OAB/IASFPA), M. H. Siegel (PSU), M. Stamatikos (OSU/NASA/GSFC) and R. L. C. Starling (U Leicester) report on behalf of the Swift Team: At 10:31:55 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100728B (trigger=430172). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 44.053, +0.280 which is RA(J2000) = 02h 56m 13s Dec(J2000) = +00d 16' 46" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 10 sec plus some possible precursor activity. The peak count rate was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 10:33:32.9 UT, 97.0 seconds after the BAT trigger. No source was detected in the first 2.5 seconds image. The XRT observed the field for approximately 80 seconds in WT mode. The prompt spectrum from the WT data shows evidence of a source. Due to an observing constraint no additional PC data were taken to allow XRT to centroid on the afterglow and derive a position. We are waiting for the full dataset to detect and localise the XRT counterpart. UVOT took a finding chart exposure of 150 seconds with the White filter starting 100 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 02:56:13.46 = 44.05607 DEC(J2000) = +00:16:51.9 = 0.28109 with a 90%-confidence error radius of about 0.75 arc sec. This position is 11.7 arc sec. from the center of the BAT error circle. The estimated magnitude is 17.30 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.07. Burst Advocate for this burst is D. C. Morris (david.c.morris AT nasa.gov). 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 11010 table
GRB_name GRB100728B
GCN_number 11010
Detection_method correction
Circular_text TITLE: GCN CIRCULAR NUMBER: 11010 SUBJECT: GRB 100728B: KAIT optical afterglow detection (correction) DATE: 10/07/28 11:45:27 GMT FROM: Daniel Perley at U.C. Berkeley D. A. Perley, A. N. Morgan, and C. R. Klein (UC Berkeley) report: The burst observed in our previous circular was in fact 100728B (Swift trigger #430172), and not 100728A (#430151, Cannizzo et al., GCN 11004). We apologize for any confusion this may have caused.
GCN 11011 table
GRB_name GRB100728B
GCN_number 11011
Detection_method correction
ra 44.0563°
decl 0.2812°
Circular_text TITLE: GCN CIRCULAR NUMBER: 11011 SUBJECT: GRB 100728B: Skynet/PROMPT Detections (correction) DATE: 10/07/28 12:00:18 GMT FROM: Kevin Ivarsen at UNC/PROMPT K. Ivarsen, J. Haislip, D. Reichart, A. LaCluyze, J. Moore, A. Foster, R. Egger, A. Oza, M. Schubel, A. Trotter, J. A. Crain, and M. Nysewander The observations reported in GCN #11008 (Swift trigger #430172) should refer to GRB 100728B rather than GRB 100728A. We observed the optical transient at the following position: RA = 02:56:13.51 Dec = +00:16:52.16 We apologize for any inconvenience this may have caused.
GCN 11012 table
GRB_name GRB100728B
GCN_number 11012
Detection_method Optical
ra 2.0000°
decl 0.0000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 11012 SUBJECT: GRB 100728B: optical detection DATE: 10/07/28 12:13:28 GMT FROM: Alexei Pozanenko at IKI, Moscow L. Elenin (ISON), I. Molotov (ISON), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 100728B (Page et al. GCN 11009) with 0.45-m astrograph f/2.8 f ISON-NM observatory (32d 54' 11.64'', 105d 31' 42. 34'' ) starting July 28 (UT) 10:56:08, i.e. 24 minutes after burst onset. A few unfiltered 300s exposures were taken before down. In a first exposures we clearly detect the afterglow at the position (J2000) RA= 02 56 13.48 Dec= +00 16 51.4 which coincides with early afterglow detection (Perley et al. GCN 11007; Page et al. GCN 11009). A preliminary photometry of unfiltered exposures against USNO-B1.0 field stars (R-filter) at 29.3 minutes after burst is 19m.
GCN 11013 table
GRB_name GRB100728B
GCN_number 11013
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 11013 SUBJECT: GRB 100728B: GROND Detection of the NIR Afterglow DATE: 10/07/28 13:28:07 GMT FROM: Robert Filgas at MPI F. Olivares, R. Filgas and J. Greiner (all MPE Garching) report on behalf of the GROND team: We observed the field of GRB 100728B (Swift trigger 430172; Morris et al., GCN #11009) simultaneously in JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPI/ESO telescope at La Silla Observatory (Chile). Observations started at 10:34 UT, 2 minutes after the GRB trigger. They were performed during astronomical twilight at an average airmass of 1.2. We detect a single point source at position reported by Perley et al. (GCN #11007), Morris et al. (GCN #11009), Ivarsen et al. (GCN #11011) and Elenin et al. (GCN #11012). Based on the first 4 min of total exposures in JHK, we estimate preliminary magnitudes (all in AB system) of J = 16.4 +- 0.1 mag, H = 16.2 +- 0.1 mag and K = 16.0 +- 0.1 mag Given magnitudes are calibrated against 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.07 mag in the direction of the burst (Schlegel et al. 1998).
GCN 11015 table
GRB_name GRB100728B
GCN_number 11015
Detection_method Fermi GBM Det
t_trigger 10:31:54.970 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 11015 SUBJECT: GRB 100728B: Fermi GBM observation DATE: 10/07/28 13:47:40 GMT FROM: Andreas von Kienlin at MPE A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team: "At 10:31:54.97 UT on 28 July 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 100728B (trigger 302005916 / 100728439), which was also detected by the Swift-BAT (Morris et al. 2008, GCN 11009) The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 57.1 degrees. The GBM light curve shows a single pulse with a duration (T90) of about 11.8 +/- 2.4 s (50-300 keV). The time-averaged spectrum from T0-1.024 s to T0+5.632 s is well fit by a power law function with an exponential high energy cutoff. The power law index is -0.9 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 131 +/- 15 keV (chi squared 1043 for 599 d.o.f.). The event fluence (8-1000 keV) in this time interval is (2.4 +/- 0.1)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+1.22 s in the 8-1000 keV band is 6.2 +/- 0.2 ph/s/cm^2. A Band function fits the spectrum equally well (chi squared 1037 for 598 d.o.f.) with Epeak= 104 +/- 14 keV, alpha = -0.8 +/- 0.2 and beta = -2.2 +/-0.2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 11017 table
GRB_name GRB100728B
GCN_number 11017
Detection_method Swift-XRT Det
ra 44.0562°
decl 0.2812°
Circular_text TITLE: GCN CIRCULAR NUMBER: 11017 SUBJECT: GRB 100728B: Enhanced Swift-XRT position DATE: 10/07/28 14:29:45 GMT FROM: Phil Evans at U of Leicester P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team. Using 820 s of XRT Photon Counting mode data and 2 UVOT images, 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 = 44.05620, 0.28120 which is equivalent to: RA (J2000): 02 56 13.48 Dec (J2000): +00 16 52.5 with an uncertainty of 2.0 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 is an official product of the Swift-XRT team.
GCN 11022 table
GRB_name GRB100728B
GCN_number 11022
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 11022 SUBJECT: GRB 100728B: Swift-XRT Refined Analysis DATE: 10/07/28 20:26:38 GMT FROM: Claudio Pagani at U of Leicester C. Pagani (U. Leicester) and D. C. Morris (GWU/GSFC) report on behalf of the Swift-XRT team: We have analysed 6.8 ks of XRT data for GRB 100728B (Morris et al. GCN Circ. 11009), from 81 s to 17.4 ks after the BAT trigger. The data comprise 86 s in Windowed Timing (WT) mode (the first 9 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 Evans et al. (GCN. Circ 11017). The light curve can be modelled with a power-law decay with a decay index of alpha=1.109 (+0.029, -0.030). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.20 (+/-0.20). The best-fitting absorption column is 1.2 (+0.4, -0.5) x 10^21 cm^-2, in excess of the Galactic value of 6.2 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 3.5 x 10^-11 (5.0 x 10^-11) erg cm^-2 count^-1. If the light curve continues to decay with a power-law decay index of 1.109, the count rate at T+24 hours will be 5.0 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.8 x 10^-13 (2.5 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/00430172. This circular is an official product of the Swift-XRT team.
GCN 11023 table
GRB_name GRB100728B
GCN_number 11023
Detection_method Swift-BAT Det
ra 44.0510°
decl 0.2960°
Circular_text TITLE: GCN CIRCULAR NUMBER: 11023 SUBJECT: GRB 100728B, Swift-BAT refined analysis DATE: 10/07/28 21:31:46 GMT FROM: Hans Krimm at NASA-GSFC S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. C. Morris (GWU/GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+350 sec from the recent telemetry downlink, we report further analysis of BAT GRB 100728B (trigger #430172) (Morris, et al., GCN Circ. 11009). The BAT ground-calculated position is RA, Dec = 44.051, 0.296 deg which is RA(J2000) = 02h 56m 12.2s Dec(J2000) = +00d 17' 45.9" with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 11%. The mask-weighted light curve shows a single peak of duration 10 seconds, starting at T-2 sec and continuing at a low level to about T+20 sec. An observing constraint moved the burst out of the BAT field of view at T+350 sec, but there is no sign of extended emission from this burst. T90 (15-350 keV) is 12.1 +- 2.4 sec (estimated error including systematics). The time-averaged spectrum from T-1.7 to T+13.2 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.55 +- 0.14. The fluence in the 15-150 keV band is 1.7 +- 0.1 x 10-6 erg/cm2. The 1-sec peak photon flux measured from T+0.18 sec in the 15-150 keV band is 3.5 +- 0.5 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/430172/BA/
GCN 11024 table
GRB_name GRB100728B
GCN_number 11024
Detection_method KAIT
Circular_text TITLE: GCN CIRCULAR NUMBER: 11024 SUBJECT: GRB 100728B: Continued KAIT observations DATE: 10/07/29 05:56:35 GMT FROM: Daniel Perley at U.C. Berkeley D. A. Perley, W. Li, and A. V. Filippenko (UC Berkeley) report on behalf of the KAIT GRB follow-up team: The Katzman Automatic Imaging Telescope (KAIT) began observations of GRB 100728B (Morris et al., GCN 11009) at 30 sec after the trigger time (10 sec after the GCN notice), and continued to track the afterglow in a combination of V, I, and unfiltered exposures until shut down by morning twilight. The afterglow remains detected throughout this period. An series of 2-second frames taken between 30-64 sec clearly shows a rapid rise from an initial mag of ~16.5 (calibrated to USNO B1.0) to a peak of 16.1 mag at ~50 seconds. The afterglow decays as an unbroken power-law with decay index alpha=0.97 after that time through the end of our observations at 5700 s. A subset of the unfiltered photometry is presented below: tstart(s) exp(s) mag unc 149 20 17.02 +/- 0.02 249 20 17.61 +/- 0.03 446 20 18.21 +/- 0.05 643 20 18.51 +/- 0.07 846 20 18.90 +/- 0.07 1141 60 19.15 +/- 0.07 1440 60 19.40 +/- 0.07 1668 60 19.76 +/- 0.10 2264 100 19.81 +/- 0.10 3326 100 19.86 +/- 0.08 4186 140 20.33 +/- 0.10 5115 140 20.58 +/- 0.14 5544 200 20.88 +/- 0.19 All times are referenced to the BAT trigger at 10:31:55 UT. Magnitudes are calibrated relative to USNO B1.0 standards in the field. Further analysis is in progress. We note that the I-band magnitude in our previous circular (GCN 11007) was calibrated to USNO R-band standards and should not be relied upon for detailed analysis. In addition, the time from burst specified in that circular is relative to the BAT position notice time, rather than the trigger time as specified. (The UT time given is correct as stated.)
GCN 11025 table
GRB_name GRB100728B
GCN_number 11025
Detection_method KAIT
Circular_text TITLE: GCN CIRCULAR NUMBER: 11025 SUBJECT: GRB 100728B: Lick Observations DATE: 10/07/29 05:59:34 GMT FROM: Daniel Perley at U.C. Berkeley D. A. Perley, C. R. Klein, and A. N. Morgan (UC Berkeley) report: We began observations of the afterglow of GRB 100728B (Morris et al., GCN 11009; Perley et al., GCN 11007) with the Nickel 40-inch telescope at Lick Observatory starting at 10:38:32 UT, 397 sec after the Swift trigger. A series of frames in R-band (as well as one V-band and one U-band exposure) was acquired. The resulting light curve shows a gradual, unbroken power-law decay with a decay index consistent with that seen in the KAIT observations (Perley et al., GCN 11024). Photometry from our first seven R-band exposures is as follows: tstart(s) exp(s) filt mag unc 397 60 R = 17.38 +/- 0.06 830 300 R = 18.33 +/- 0.05 1162 300 R = 18.53 +/- 0.06 1497 200 R = 18.71 +/- 0.07 1888 160 R = 18.88 +/- 0.09 2062 120 R = 18.80 +/- 0.09 2197 120 R = 18.99 +/- 0.11 Calibration is relative to a single bright star at RA=44.041108, dec=+0.242409 (SDSS DR6 magnitudes g=15.61, r=14.52, i=14.57; the equivalent Cousins R magnitude is R=14.3 using the average of the two SDSS Lupton transformations.) As this star may be weakly blended with a faint neighbor and its USNO magnitude (R2=13.94) differs from this SDSS value, caution is advised in interpreting the absolute calibration.
GCN 11026 table
GRB_name GRB100728B
GCN_number 11026
Detection_method Swift-UVOT Det
ra 163.4881°
decl 0.2812°
redshift 2.8000
Circular_text TITLE: GCN CIRCULAR NUMBER: 11026 SUBJECT: GRB 100728B: Swift/UVOT Observations DATE: 10/07/29 08:52:21 GMT FROM: Samantha Oates at MSSL S. R. Oates (MSSL-UCL) and D. C. Morris (GWU/GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began observerving the field of GRB 100728B 101s after the BAT trigger (Morris et al., GCN Circ. 11009). We detect the optical afterglow in the white, v, b and u filters only. The refined UVOT position is RA (J2000)= 163.48809, DEC (J2000)=-45.47265, which is equivalent to: RA (J2000) = 02:56:13.467 Dec (J2000) = +00:16:52.18 with an estimated uncertainty of 0.52 arcsec (radius, 90% confidence). This position is consistent with the XRT refined position (Evans et al., GCN Circ 11017) and with the optical afterglow positions reported by KAIT (Perley et al., GCN Circ 11007, 11010 & 11024), PROMPT (Ivarsen et al., GCN Circ 11008, 11011) & the SON-NM observatory (Elenin et al., GCN Circ 11012). The non-detection in the UV filters suggests a photometric redshift of z~2.8. Preliminary magnitudes and the 3 sigma upper limits are reported below for individual optical images and summed UV images. Filter T_start(s) T_stop(s) Exposure Mag/3SigUL ########################################################### white 101 251 147 17.43 +/- 0.08 white 4713 4913 197 20.62 +/- 0.22 v 3687 3887 197 20.19 +/- 0.56 b 4509 4709 197 20.47 +/- 0.33 u 4303 4503 197 19.90 +/- 0.28 uvw1 4098 6050 294 > 20.50 uvm2 3892 5529 393 > 20.52 uvw2 3482 5119 393 > 20.93 ########################################################### The above magnitudes are not corrected for the Galactic extinction corresponding to a non-negligible reddening of E_{B-V} = 0.07 mag (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383,627).
GCN 11027 table
GRB_name GRB100728B
GCN_number 11027
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 11027 SUBJECT: GRB 100728B - NOT optical observation DATE: 10/07/29 10:51:33 GMT FROM: Annalisa De Cia at U of Reykjavik,Science Inst. A. De Cia (University of Iceland), D. Malesani (DARK/NBI), P.M. Vreeswijk, S. Schulze and P. Jakobsson (University of Iceland) report: We observed the field of GRB 100728B (Morris et al., GCN 11009) with the NOT equipped with StanCam, under poor seeing conditions. Observations were carried out in the R filter for 40 minutes, with mean time 18.36 hours after the GRB trigger. The seeing was 1.3". At the position of the optical afterglow (Perley et al., GCN 11007; Morris et al., GCN 11009) we do not detect any clear source, down to a limiting mag R > 22.2. By smoothing the image, a weak source can be marginally detected with magnitude R = 22.5 +/- 0.5 mag, calibrated against SDSS stars converted to Vega. We acknowledge the careful assistence of the NOT staff, in particular Anders Thygesen.
GCN 11028 table
GRB_name GRB100728B
GCN_number 11028
Detection_method correction
ra 0.2812°
decl 0.2812°
Circular_text TITLE: GCN CIRCULAR NUMBER: 11028 SUBJECT: GRB 100728B: Swift/UVOT Observations (correction) DATE: 10/07/30 15:10:48 GMT FROM: Samantha Oates at MSSL The coordinates in circular 11026 should be RA (J2000)= 0.28116, DEC (J2000)=44.05611, which is equivalent to: RA (J2000) = 02:56:13.467 Dec (J2000) = +00:16:52.18 The coordinates in the degree format in circular 11026 were accidentally taken from a different GRB.
GCN 11029 table
GRB_name GRB100728B
GCN_number 11029
Detection_method correction
ra 44.0561°
decl 0.2812°
Circular_text TITLE: GCN CIRCULAR NUMBER: 11029 SUBJECT: GRB 100728B: Swift/UVOT Observations (correction to GCN 11028) DATE: 10/07/30 15:27:55 GMT FROM: Samantha Oates at MSSL Apologies, the coordinates in circular 11028 should be RA (J2000)= 44.05611, DEC (J2000)=0.28116
GCN 11045 table
GRB_name GRB100728B
GCN_number 11045
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 11045 SUBJECT: GRB 100728B: optical photometry of ISON-NM DATE: 10/08/03 21:25:21 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova (SAI MASU), L. Elenin, I. Molotov (ISON), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 100728B (Morris et al. GCN 11009) with 0.45-m telescope f ISON-NM observatory on July 28 (Elenin at al., GCN 11012). The afterglow ( Perley et al. GCN 11007; Morris et al. GCN 11009; Ivarsen et al. GCN 11011) is detectable on each of four images taken between July 28 (UT) 10:45:49 - 11:01:14. A photometry of unfiltered images against SDSS field stars and R-mag obtained with Lupton transformations is following t-t0, filter, exposure, OT (sec) 984 W 300 18.36+/-0.17 1294 W 300 18.93+/-0.22 1603 W 300 18.80+/-0.18 1909 W 300 19.00+/-0.30 Finding chart and SDSS calibration stars can be found at http://grb.rssi.ru/GRB100728B/100728b-refstars.png
GCN 11317 table
GRB_name GRB100728B
GCN_number 11317
Detection_method Other
redshift 2.1060
Circular_text TITLE: GCN CIRCULAR NUMBER: 11317 SUBJECT: GRB 100728B: X-shooter redshift DATE: 10/10/07 12:41:13 GMT FROM: Hector Flores at Obs.de Paris,Meudon H. Flores (GEPI/Obs. de Paris), J. P. U. Fynbo, A. de Ugarte Postigo, B. Milvang-Jensen, D. Malesani (DARK/NBI), P. Goldoni (APC/Univ. Paris 7 and SAp/CEA), C. C. Thoene (IAA-CSIC Granada), S. Piranomonte (INAF/Roma), S. D. Vergani (GEPI/Obs. de Paris), F. Onori (Univ. Roma 3) report on behalf of the X-Shooter GRB collaboration: We have observed the afterglow of the GRB 100728B (Morris et al., GCN 11009; Perley et al., GCN 11010) with the ESO VLT equipped with the X-shooter spectrograph. The observation started on 2010-07-29 at 08:15 UT (22 hr after the GRB). A total exposure of 4x600 s was obtained, covering the spectral range from 300 to 2500 nm. Due to technical problems with the atmospheric dispersion corrector, the sensitivity of the instrument was below the nominal value during this observation so the signal-to-noise ratio of the spectrum is very low. In the spectra we detect a broad absorption line consistent with a damped Lyman-alpha line and absorption features consistent with the MgII doublet at a common redshift of z=2.106. Given the low S/N of the spectrum, this redshift measurement should be considered tentative. We acknowledge the Paranal staff, in particular Alain Smette, for valuable support with the observations, and Daniel Perley (Berkeley) for providing us a finding chart with the afterglow. [GCN OPS NOTE(07oct10): Per author's request, Onori was added to the author list.]