Gamma-ray Burst 140430A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 30 Apr 14 20:33:50 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     597722,   Seg_Num: 0
  GRB_RA:          102.929d {+06h 51m 43s} (J2000),
                   103.146d {+06h 52m 35s} (current),
                   102.173d {+06h 48m 42s} (1950)
  GRB_DEC:         +23.009d {+23d 00' 34"} (J2000),
                   +22.991d {+22d 59' 29"} (current),
                   +23.070d {+23d 04' 12"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       3101 [cnts]    Image_Peak=197 [image_cnts]
  TRIGGER_DUR:     0.512 [sec] 
  TRIGGER_INDEX:   121     E_range: 15-50 keV
  BKG_INTEN:       36202 [cnts]
  BKG_TIME:        74004.04 SOD {20:33:24.04} UT
  BKG_DUR:         8 [sec]
  GRB_DATE:        16777 TJD;   120 DOY;   14/04/30
  GRB_TIME:        74016.52 SOD {20:33:36.52} UT
  GRB_PHI:          19.71 [deg]
  GRB_THETA:         9.09 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     15.71 [sigma]
  IMAGE_SIGNIF:    9.01 [sigma]
  MERIT_PARAMS:     +1  +0  +0  -1  +1  -1  +0  +0 -47  +0 
  SUN_POSTN:        38.00d {+02h 32m 00s}  +14.94d {+14d 56' 38"}
  SUN_DIST:         61.67 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
  MOON_POSTN:       58.24d {+03h 52m 59s}  +17.34d {+17d 20' 20"}
  MOON_DIST:        42.37 [deg]
  MOON_ILLUM:      3 [%]
  GAL_COORDS:      192.26, 10.33 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      101.88,  0.10 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Coordinates.  
  COMMENTS:        This is a rate trigger.  
  COMMENTS:        A point_source was found.  
  COMMENTS:        This does not match any source in the on-board catalog.  
  COMMENTS:        This does not match any source in the ground catalog.  
  COMMENTS:        This is a GRB.  
  COMMENTS:        This trigger occurred at longitude,latitude = 350.72,-9.76 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 30 Apr 14 20:35:00 UT
  NOTICE_TYPE:     Swift-XRT Position
  TRIGGER_NUM:     597722,   Seg_Num: 0
  GRB_RA:          102.9359d {+06h 51m 44.61s} (J2000),
                   103.1525d {+06h 52m 36.59s} (current),
                   102.1797d {+06h 48m 43.13s} (1950)
  GRB_DEC:         +23.0227d {+23d 01' 21.7"} (J2000),
                   +23.0047d {+23d 00' 16.9"} (current),
                   +23.0832d {+23d 04' 59.6"} (1950)
  GRB_ERROR:       4.9 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       3.99e-09 [erg/cm2/sec]
  GRB_SIGNIF:      11.18 [sigma]
  IMG_START_DATE:  16777 TJD;   120 DOY;   14/04/30
  IMG_START_TIME:  74067.32 SOD {20:34:27.32} UT,   50.8 [sec] since BAT Trigger Time
  TAM[0-3]:        327.67 237.22 261.68 243.51
  AMPLIFIER:       2
  WAVEFORM:        134
  SUN_POSTN:        38.00d {+02h 32m 00s}  +14.94d {+14d 56' 39"}
  SUN_DIST:         61.67 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
  MOON_POSTN:       58.26d {+03h 53m 01s}  +17.34d {+17d 20' 25"}
  MOON_DIST:        42.36 [deg]
  MOON_ILLUM:      3 [%]
  GAL_COORDS:      192.25, 10.34 [deg] galactic lon,lat of the burst
  ECL_COORDS:      101.89,  0.12 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        The XRT position is 0.87 arcmin from the BAT position.  
  COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
  COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
  COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 30 Apr 14 20:35:10 UT
  NOTICE_TYPE:     Swift-XRT Image
  TRIGGER_NUM:     597722,   Seg_Num: 0
  GRB_RA:          102.9359d {+06h 51m 44.6s} (J2000),
                   103.1525d {+06h 52m 36.5s} (current),
                   102.1797d {+06h 48m 43.1s} (1950)
  GRB_DEC:         +23.0227d {+23d 01' 21.7"} (J2000),
                   +23.0047d {+23d 00' 16.9"} (current),
                   +23.0832d {+23d 04' 59.6"} (1950)
  GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       125 [cnts]
  IMG_START_DATE:  16777 TJD;   120 DOY;   14/04/30
  IMG_START_TIME:  74067.32 SOD {20:34:27.32} UT,   50.8 [sec] since BAT Trigger Time
  CENTROID_X:      314.67,  raw= 315  [pixels]
  CENTROID_Y:      268.92,  raw= 269  [pixels]
  ROLL:            275.08 [deg]
  GAIN:            2
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   -68.06
  GRB_POS_XRT_Z:   22.09
  IMAGE_URL:       sw00597722000msxps_rw.img
  SUN_POSTN:        38.00d {+02h 32m 00s}  +14.94d {+14d 56' 39"}
  SUN_DIST:         61.67 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
  MOON_POSTN:       58.26d {+03h 53m 02s}  +17.34d {+17d 20' 26"}
  MOON_DIST:        42.36 [deg]
  MOON_ILLUM:      3 [%]
  GAL_COORDS:      192.25, 10.34 [deg] galactic lon,lat of the burst
  ECL_COORDS:      101.89,  0.12 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Image.  
  COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
  COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
  COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 30 Apr 14 20:35:19 UT
  NOTICE_TYPE:     Swift-XRT Processed Image
  TRIGGER_NUM:     597722,   Seg_Num: 0
  GRB_RA:          102.9359d {+06h 51m 44.6s} (J2000),
                   103.1525d {+06h 52m 36.5s} (current),
                   102.1797d {+06h 48m 43.1s} (1950)
  GRB_DEC:         +23.0227d {+23d 01' 21.7"} (J2000),
                   +23.0047d {+23d 00' 16.9"} (current),
                   +23.0832d {+23d 04' 59.6"} (1950)
  GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       125 [cnts]
  IMG_START_DATE:  16777 TJD;   120 DOY;   14/04/30
  IMG_START_TIME:  74067.32 SOD {20:34:27.32} UT,   50.8 [sec] since BAT Trigger Time
  CENTROID_X:      314.67,  raw= 315  [pixels]
  CENTROID_Y:      268.92,  raw= 269  [pixels]
  ROLL:            275.08 [deg]
  GAIN:            2
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   -68.06
  GRB_POS_XRT_Z:   22.09
  IMAGE_URL:       sw00597722000msxps_rw.img
  SUN_POSTN:        38.00d {+02h 32m 00s}  +14.94d {+14d 56' 39"}
  SUN_DIST:         61.67 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
  MOON_POSTN:       58.26d {+03h 53m 02s}  +17.34d {+17d 20' 26"}
  MOON_DIST:        42.36 [deg]
  MOON_ILLUM:      3 [%]
  GAL_COORDS:      192.25, 10.34 [deg] galactic lon,lat of the burst
  ECL_COORDS:      101.89,  0.12 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Processed Image.  
  COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
  COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
  COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 30 Apr 14 20:37:03 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     597722,   Seg_Num: 0
  GRB_RA:          102.929d {+06h 51m 43s} (J2000),
                   103.146d {+06h 52m 35s} (current),
                   102.173d {+06h 48m 42s} (1950)
  GRB_DEC:         +23.009d {+23d 00' 34"} (J2000),
                   +22.991d {+22d 59' 29"} (current),
                   +23.070d {+23d 04' 12"} (1950)
  GRB_DATE:        16777 TJD;   120 DOY;   14/04/30
  GRB_TIME:        74016.52 SOD {20:33:36.52} UT
  TRIGGER_INDEX:   121
  GRB_PHI:          19.71 [deg]
  GRB_THETA:         9.09 [deg]
  DELTA_TIME:      32.00 [sec]
  TRIGGER_DUR:     0.512 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     15.71 [sigma]
  IMAGE_SIGNIF:    9.01 [sigma]
  LC_URL:          sw00597722000msb.lc
  SUN_POSTN:        38.00d {+02h 32m 00s}  +14.94d {+14d 56' 40"}
  SUN_DIST:         61.67 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
  MOON_POSTN:       58.27d {+03h 53m 06s}  +17.34d {+17d 20' 34"}
  MOON_DIST:        42.34 [deg]
  MOON_ILLUM:      3 [%]
  GAL_COORDS:      192.26, 10.33 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      101.88,  0.10 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Lightcurve.  
  COMMENTS:           
  COMMENTS:        The next comments were copied from the BAT_POS Notice:  
  COMMENTS:        This is a rate trigger.  
  COMMENTS:        A point_source was found.  
  COMMENTS:        This does not match any source in the on-board catalog.  
  COMMENTS:        This does not match any source in the ground catalog.  
  COMMENTS:        This is a GRB.  
  COMMENTS:        This trigger occurred at longitude,latitude = 350.72,-9.76 [deg].  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 30 Apr 14 20:41:19 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     597722,   Seg_Num: 0
  POINT_RA:        102.927d {+06h 51m 42s} (J2000)
  POINT_DEC:       +23.003d {+23d 00' 10"} (J2000)
  POINT_ROLL:      275.076d
  IMG_START_DATE:  16777 TJD;   120 DOY;   14/04/30
  IMG_START_TIME:  74199.75 SOD {20:36:39.75} UT,   183.2 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        6.303
  N_STARS:         126
  X_OFFSET:        488 [pixels]
  Y_OFFSET:        607 [pixels]
  X_MAX:           1447 [pixels]
  Y_MAX:           1566 [pixels]
  DET_THRESH:      21
  PHOTO_THRESH:    13
  SL_URL:          sw00597722000msufc0183.fits
  SUN_POSTN:        38.00d {+02h 32m 01s}  +14.95d {+14d 56' 43"}
  SUN_DIST:         61.66 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
  MOON_POSTN:       58.31d {+03h 53m 15s}  +17.35d {+17d 20' 52"}
  MOON_DIST:        42.30 [deg]
  MOON_ILLUM:      3 [%]
  GAL_COORDS:      192.26, 10.32 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      101.88,  0.10 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 30 Apr 14 20:41:46 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     597722,   Seg_Num: 0
  POINT_RA:        102.927d {+06h 51m 42s} (J2000)
  POINT_DEC:       +23.003d {+23d 00' 10"} (J2000)
  POINT_ROLL:      275.076d
  IMG_START_DATE:  16777 TJD;   120 DOY;   14/04/30
  IMG_START_TIME:  74199.75 SOD {20:36:39.75} UT,   183.2 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        6.303
  N_STARS:         126
  X_OFFSET:        488 [pixels]
  Y_OFFSET:        607 [pixels]
  X_MAX:           1447 [pixels]
  Y_MAX:           1566 [pixels]
  DET_THRESH:      21
  PHOTO_THRESH:    13
  SL_URL:          sw00597722000msufc0183.fits
  SUN_POSTN:        38.01d {+02h 32m 01s}  +14.95d {+14d 56' 44"}
  SUN_DIST:         61.66 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
  MOON_POSTN:       58.32d {+03h 53m 16s}  +17.35d {+17d 20' 54"}
  MOON_DIST:        42.29 [deg]
  MOON_ILLUM:      3 [%]
  GAL_COORDS:      192.26, 10.32 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      101.88,  0.10 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Processed Source List.  
  COMMENTS:        All 4 attachments are included.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 30 Apr 14 20:45:27 UT
  NOTICE_TYPE:     Swift-UVOT Position
  TRIGGER_NUM:     597722,   Seg_Num: 0
  GRB_RA:          102.9358d {+06h 51m 44.59s} (J2000),
                   103.1524d {+06h 52m 36.57s} (current),
                   102.1796d {+06h 48m 43.11s} (1950)
  GRB_DEC:         +23.0236d {+23d 01' 24.9"} (J2000),
                   +23.0056d {+23d 00' 20.1"} (current),
                   +23.0841d {+23d 05' 02.8"} (1950)
  GRB_ERROR:       0.6 [arcsec radius, statistical only]
  GRB_MAG:         18.15 +/- 0.14 [mag]
  FILTER:          10, White
  IMG_START_DATE:  16777 TJD;   120 DOY;   14/04/30
  IMG_START_TIME:  74198.00 SOD {20:36:38.00} UT,   181.5 [sec] since BAT Trigger Time
  SUN_POSTN:        38.01d {+02h 32m 02s}  +14.95d {+14d 56' 47"}
  SUN_DIST:         61.67 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
  MOON_POSTN:       58.35d {+03h 53m 25s}  +17.35d {+17d 21' 10"}
  MOON_DIST:        42.27 [deg]
  MOON_ILLUM:      3 [%]
  GAL_COORDS:      192.25, 10.34 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      101.89,  0.12 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT UVOT Position Notice.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  COMMENTS:        The UVOT position is 3.2 arcsec from the XRT position.  
  COMMENTS:        Result based on Genie data.  
  COMMENTS:        Notice generated automatically.  
  

• GCN Circular #16190
  M. H. Siegel (PSU), W. H. Baumgartner (GSFC/UMBC), M. M. Chester (PSU), V. D'Elia (ASDC), S. T. Holland (STScI), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC) and T. N. Ukwatta (MSU) report on behalf of the Swift Team:
  At 20:33:36 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140430A (trigger=597722). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 102.929, +23.009 which is

     RA(J2000)  =  06h 51m 43s
     Dec(J2000) = +23d 00' 34"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 10 sec. The peak count rate was ~4500 counts/sec (15-350 keV), at ~1 sec after the trigger.
  The XRT began observing the field at 20:34:27.3 UT, 50.8 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 102.9359, 23.0227 which is equivalent to:

     RA(J2000)  = +06h 51m 44.62s
     Dec(J2000) = +23d 01' 21.7"
  

  with an uncertainty of 4.9 arcseconds (radius, 90% containment). This location is 54 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 2.5 s image was 3.99e-09 erg cm^-2 s^-1 (0.2-10 keV).
  UVOT took a finding chart exposure of 150 seconds with the White filter starting 183 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 06:51:44.61 = 102.93589 DEC(J2000) = +23:01:25.2 = 23.02367 with a 90%-confidence error radius of about 0.62 arc sec. This position is 3.5 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.16 with a 1-sigma error of about 0.15. No correction has been made for the expected extinction corresponding to E(B-V) of 0.14.
  Burst Advocate for this burst is M. H. Siegel (siegel AT swift.psu.edu). 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 Circular #16192
  A. Melandri (INAF-OAB), C. Guidorzi (U. Ferrara), A. Gomboc (U. Ljubljana), R. J. Smith and C. G. Mundell (LJMU), on behalf of a large collaboration report:
  The 2-m Liverpool Telescope with the RINGO3 polarimeter robotically followed up Swift GRB 140430A (Siegel et al., GCN 16190) at 20:35:40 UT (~2 min after the burst trigger).
  We detect the optical afterglow at the UVOT position. In a coadded 3x10s SDSS-r image, we estimate a preliminary magnitude R = 18.4 +/- 0.1 at t_mid = 33.1 min since the Swift/BAT trigger time. The magnitude is calibrated against nearby USNO-B1 stars.
  Observations are ongoing.
• GCN Circular #16193
  D. Malesani (DARK/NBI), T. Kruehler (ESO Santiago), A. de Ugarte Postigo (IAA/CSIC and DARK/NBI), H. Dahle (Univ. Oslo), E. Soto (CUA), report on behalf of a larger collaboration:
  We observed the optical afterglow of GRB 140430A (Siegel et al., GCN 16190; Melandri et al., GCN 16192) with the Nordic Optical Telescope equipped with ALFOSC. We took a single 100-s image in the R filter starting at 22:00 UT (86.5 min after the GRB). The optical afterglow is well detected at coordinates (J2000):

  RA = 06:51:44.61
  Dec = +23:01:25.1
  

  with an uncertainty of 0.3". Assuming R = 15.13 for the USNO star at RA = 06:51:41.3, Dec = +23:01:44.0, we measure for the optical afterglow a magnitude R = 18.78 +- 0.02 (statistical error only).
  A 1800-s spectrum was acquired starting at 22:11 UT, at airmass 2.2-2.8, covering the wavelength range 3200-9100 AA. From a preliminary analysis, no absorption or emission features are seen in the spectrum. From the lack of a DLA feature down to ~4000 AA, we can set a redshift limit z < 2.3.
• GCN Circular #16194
  T. Kruehler (ESO Santiago), D. Malesani (DARK/NBI), A. de Ugarte Postigo (IAA/CSIC and DARK/NBI), A. Melandri (INAF/OABr), J. P. U. Fynbo (DARK/NBI), report on behalf of a larger collaboration:
  We observed the optical afterglow of GRB 140430A (Siegel et al., GCN 16190) with the ESO VLT equipped with X-shooter. Observations started at 23:09 UT on 2014 April 30 (2.5 hr after the GRB), still in twilight, and two 10-minute spectra were secured. The covered wavelength range is 3000-25000 AA.
  We detect a clear continuum, and several absorption features, which we interpret as due, among others, to Si II, C IV, Al II, Fe II, and Mg II at a common redshift z = 1.60. In the infrared arm, we also detect the [O III] 5008 nebular line in emission at the same redshift.
  We acknowledge excellent support from the ESO staff at Paranal, in particular Andrea Mehner, Rodrigo Romero, and Stephane Brillant.
• GCN Circular #16195
  P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
  Using 1017 s of XRT Photon Counting mode data and 3 UVOT images for GRB 140430A, 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 = 102.93576, +23.02375 which is equivalent to:

  RA (J2000): 06h 51m 44.58s
  Dec (J2000): +23d 01' 25.5"
  

  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 Circular #16196
  M. Kennedy (University College Cork), P. Garnavich (Notre Dame)
  We observed the region around GRB 140430A with the 1.8m Vatican Advanced Technology Telescope (VATT) on 2014 May 1 (UT). With the VATT4K CCD we obtained 5x120s exposures in the R-band centered around 03:22UT (408 mins after the GRB). A source not seen in the Digitized Sky Survey is well-detected at the coordinates reported by Malesani et al (GCN 16193). Relative photometry was carried out using the same nearby star used by Malesani et al. which has an R-band magnitude of R=15.13.
  Our R-band magnitude for the GRB, 6.81 hours after the initial outburst, is R=20.07 +- 0.03. Combining our results with the magnitude from GCN 16193 we estimate an optical power-law decay index of 0.76.
• GCN Circular #16197
  M.C. Stroh (PSU), D.N. Burrows (PSU), K.L. Page (U. Leicester), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU) and M.H. Siegel report on behalf of the Swift-XRT team:
  We have analysed 7.0 ks of XRT data for GRB 140430A (Siegel et al. GCN Circ. 16190), from 132 s to 23.5 ks after the BAT trigger. The data comprise 382 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 16195).
  The late-time light curve (from T0+3.8 ks) can be modelled with a power-law decay with a decay index of alpha=0.68 (+0.12, -0.13).
  A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.05 (+/-0.04). The best-fitting absorption column is 3.7 (+1.4, -1.3) x 10^21 cm^-2, at a redshift of 1.6, in addition to the Galactic value of 2.1 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.21 (+0.20, -0.19) and a best-fitting absorption column of 5.3 (+6.5, -5.3) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.3 x 10^-11 (5.2 x 10^-11) erg cm^-2 count^-1.
  A summary of the PC-mode spectrum is thus:

  Galactic foreground: 2.1 x 10^21 cm^-2
  Intrinsic column:    5.3 (+6.5, -5.3) x 10^21 cm^-2 at z=1.6
  Photon index:	     2.21 (+0.20, -0.19)
  

  If the light curve continues to decay with a power-law decay index of 0.68, the count rate at T+24 hours will be 0.018 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.0 x 10^-13 (9.6 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/00597722.
  This circular is an official product of the Swift-XRT team.
• GCN Circular #16198
  A. A. Breeveld (UCL-MSSL) and M. H. Siegel (PSU) report on behalf of the=20 Swift/UVOT team:
  The Swift/UVOT began settled observations of the field of GRB 140430A=20 183 s after the BAT trigger (Siegel et al., GCN Circ. 16190). A fading=20 source consistent with the refined XRT position (Evans et al. GCN Circ.=20 16195) is confirmed in the initial UVOT exposures. The detection in the=20 uvw1 filter, but not in uvm2 and uvw2 is consistent with the redshift of=20 1.6 given by Kruehler et al., (GCN Circ. 16194).
  Preliminary detections and 3-sigma upper limits using the UVOT=20 photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for=20 the early exposures are:

  Filter         T_start(s)   T_stop(s)      Exp(s)           Mag
  
  white_FC           183          333          147         18.17 =B1 0.09
  white             4020         4220          197         19.61 =B1 0.17
  v                  417         4630          216        >18.6
  b                 3815         4015          197         19.77 =B1 0.34
  u                10431        10933          490         19.46 =B1 0.19
  uvw1              6178        10424          966         20.40 =B1 0.31
  uvm2               442         4835          216        >19.9
  uvw2               393         4425          216        >19.4
  

  The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) =3D 0.14 in the direction of the burst (Schlegel et al. 1998).
• GCN Circular #16200
  H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. H. Siegel (PSU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
  Using the data set from T-152 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 140430A (trigger #597722) (Siegel, et al., GCN Circ. 16190). The BAT ground-calculated position is RA, Dec = 102.942, 23.033 deg, which is

     RA(J2000)  =  06h 51m 46.0s 
     Dec(J2000) = +23d 01' 58.2" 
  

  with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
  The mask-weighted light curve shows several well separated peaks. The first (and brightest) starts at ~T-1 sec, peaks at ~T+4 sec, and ends at ~T+9 sec. The 2nd and 3rd peaks peak at ~T+30 and ~T+180, respectively. T90 (15-350 keV) is 173.6 +- 3.7 sec (estimated error including systematics).
  The time-averaged spectrum from T-0.30 to T+177.58 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.00 +- 0.22. The fluence in the 15-150 keV band is 1.1 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.44 sec in the 15-150 keV band is 2.5 +- 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/597722/BA/
• GCN Circular #16201
  M. Kennedy (University College Cork), P. Garnavich (Notre Dame)
  We again observed the field around GRB 140430A with the 1.8m Vatican Advanced Technology Telescope (VATT; GCN 16196). Observations with the VATT4K CCD were centered around 3:22 UT on 2014 May 2 (1848 minutes after the burst). We obtained 5x300s exposures with the R-band filter in good seeing. We detect the previously reported afterglow in the combined images.
  With the same USNO comparison star used by Malesani et al (GCN 16193) and Kennedy et al. (GCN 16196) we estimate the afterglow brightness as R=21.7 +/- 0.1 at 30.81 hours after the burst. This is fainter than the extrapolation of the power-law decay rate estimated for the first seven hours and we conclude that optical power-law decay index has steepened to 1.0 over the past day.
• GCN Circular #16205
  J. Gorosabel (IAA-CSIC/UPV-EHU), E. Gomez (IAC), P.A. Gonzalez-Morales (IAC), J. Cepa (IAC), report on behalf of a larger collaboration:
  "We observed the field of GRB 140430A (Siegel et al. GCN 16190) with the 0.82m IAC80 telescope located at Observatorio del Teide, Tenerife, Spain. The observations were carried on April 30.87401-30.88509 UT (25.0-40.9 min post burst) using the BVR-band filters. The optical afterglow is clearly detected in the three bands with a preliminary Vega magnitude of B=19.3 against the USNO B1.0 catalogue."
• GCN Circular #16211
  A. J=E4rvinen (AIP) and J. Gorosabel (IAA-CSIC/UPV-EHU), report on behalf of larger collaborations:
  "The field of GRB 140430A (Siegel et al. GCN 16190) was observed with=20 WiFSIP on STELLA-I telescope located at Observatorio del Teide, Tenerife, Spain. The automatic observations were carried out on April 30., 2.9-32.5 min post trigger using the r'-band filter. The object is=20 clearly detected in all 52 images with preliminary r'(AB) magnitudes ranging from ~17.0 to ~18.6 calibrated against the USNO B1.0 catalogue."
  [GCN OPS NOTE(03may14): The distribution was delayed by 3 hours due to a stale address in the vetting list.]
• GCN Circular #16212
  T. Sakamoto, D. Kawamura, A. Yoshida (AGU)
  We observed the field of GRB 140430A detected by Swift (trigger #597722; Siegel et al., GCN Circ. 16190) with the iTelescope.Net (http://www.itelescope.net) T16 (15 cm Takahashi TOA-150) telescope located at the AstroCamp Observatory (Nerpio, Spain).
  Due to the elevation constraint, we were able to collect only 4 images of 60 sec exposures in the R filter starting from April 30 20:46:42 (UT) about 13 minutes after the trigger and stopped on April 30 20:52:42 (UT). We do not detect the optical afterglow both in the individual images and the stacked image at the reported optical afterglow position (Siegel et al., GCN Circ. 16190; Malesani et al., GCN Circ. 16193). The estimated five sigma upper limit of the combined image (total exposure of 240 sec) is ~18.6 using the USNO-B1 catalog.
• GCN Circular #16222
  T. Fujiwara, T. Yoshii, Y. Saito, Y. Tachibana, H. Ohuchi, S. Kurita, Y.Ono , Y. Yatsu, and N. Kawai (Tokyo Tech)
  report on behalf of the MITSuME collaboration: We observed the field of GRB 140430A (Siegel et al. , GCN Circular #16190) with the optical three color (g, Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
  The observation started on 2014-05-01 10:57:06 UT ( 14.4 h after the burst). We did not find any new point source within the enhanced XRT circle (Evans et al., GCNC 16195) in all the three bands. The measured magnitudes were listed below.

  T0+[sec]    MID-UT    T-EXP[sec]    g'         Rc         Ic
  ---------------------------------------------------------------------------------------
     54229  11:37:25     3540        >19.2    >19.5     >19.2
  ---------------------------------------------------------------------------------------
  T0+ : Elapsed time after the burst
  T-EXP: Total Exposure time
  

  We used GSC2.3 catalog for flux calibration.
• 1509.03099 from 11 Sep 15
  D. Kopac et al.: Limits on optical polarization during the prompt phase of GRB 140430A
  Gamma-ray burst GRB 140430A was detected by the Swift satellite and observed promptly with the imaging polarimeter RINGO3 mounted on the Liverpool Telescope, with observations beginning while the prompt $\gamma$-ray emission was still ongoing. In this paper, we present densely sampled (10-second temporal resolution) early optical light curves in 3 optical bands and limits to the degree of optical polarization. We compare optical, X-ray and gamma-ray properties and present an analysis of the optical emission during a period of high-energy flaring. The complex optical light curve cannot be explained merely with a combination of forward and reverse shock emission from a standard external shock, implying additional contribution of emission from internal shock dissipation. We estimate an upper limit for time averaged optical polarization during the prompt phase to be as low as P < 12% (1$\sigma$). This suggests that the optical flares and early afterglow emission in this GRB are not highly polarized. Alternatively, time averaging could mask the presence of otherwise polarized components of distinct origin at different polarization position angles.