Gamma-ray Burst 180704A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 04 Jul 18 05:36:57 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     846088,   Seg_Num: 0
  GRB_RA:           32.638d {+02h 10m 33s} (J2000),
                    33.028d {+02h 12m 07s} (current),
                    31.594d {+02h 06m 23s} (1950)
  GRB_DEC:         +69.948d {+69d 56' 52"} (J2000),
                   +70.034d {+70d 02' 03"} (current),
                   +69.712d {+69d 42' 43"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       5033 [cnts]    Image_Peak=127 [image_cnts]
  TRIGGER_DUR:     1.024 [sec] 
  TRIGGER_INDEX:   155     E_range: 50-350 keV
  BKG_INTEN:       23467 [cnts]
  BKG_TIME:        20186.79 SOD {05:36:26.79} UT
  BKG_DUR:         8 [sec]
  GRB_DATE:        18303 TJD;   185 DOY;   18/07/04
  GRB_TIME:        20202.85 SOD {05:36:42.85} UT
  GRB_PHI:         -18.14 [deg]
  GRB_THETA:        57.68 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     34.87 [sigma]
  IMAGE_SIGNIF:    7.74 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +0  +3  -2  +0  +1 -46  +0 
  SUN_POSTN:       103.28d {+06h 53m 08s}  +22.87d {+22d 52' 28"}
  SUN_DIST:         61.86 [deg]   Sun_angle= 4.7 [hr] (West of Sun)
  MOON_POSTN:      350.35d {+23h 21m 23s}   -8.07d {-08d 04' 01"}
  MOON_DIST:        83.30 [deg]
  MOON_ILLUM:      71 [%]
  GAL_COORDS:      129.66,  8.12 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:       62.01, 52.03 [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 = 144.49,4.50 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  
  TITLE: GCN/INTEGRAL NOTICE NOTICE_DATE: Wed 04 Jul 18 05:37:25 UT NOTICE_TYPE: INTEGRAL SPI ACS Trigger TRIGGER_NUM: 8094, Sub_Num: 0 GRB_INTEN: 9.35 [sigma] GRB_TIME: 20183.17 SOD {05:36:23.17} UT GRB_DATE: 18303 TJD; 185 DOY; 18/07/04 COMMENTS: INTEGRAL SPI_ACS GRB Trigger. COMMENTS: Time_Scale=2.0000 and Time_Error=1.0000. COMMENTS: COMMENTS: NOTE: This SPIACS event is temporally(19.0<100sec) coincident with the SWIFT_BAT event (trignum=846088). COMMENTS: COMMENTS: The SPIACS lightcurve can be found at: COMMENTS: +ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2018-07/2018-07-04T05-36-22.9940-16784-111 52-0.lc
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 04 Jul 18 05:40:37 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     846088,   Seg_Num: 0
  GRB_RA:           32.638d {+02h 10m 33s} (J2000),
                    33.028d {+02h 12m 07s} (current),
                    31.594d {+02h 06m 23s} (1950)
  GRB_DEC:         +69.948d {+69d 56' 52"} (J2000),
                   +70.034d {+70d 02' 03"} (current),
                   +69.712d {+69d 42' 43"} (1950)
  GRB_DATE:        18303 TJD;   185 DOY;   18/07/04
  GRB_TIME:        20202.85 SOD {05:36:42.85} UT
  TRIGGER_INDEX:   155
  GRB_PHI:         -18.14 [deg]
  GRB_THETA:        57.68 [deg]
  DELTA_TIME:      -5.00 [sec]
  TRIGGER_DUR:     1.024 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     34.87 [sigma]
  IMAGE_SIGNIF:    7.74 [sigma]
  LC_URL:          sw00846088000msb.lc
  SUN_POSTN:       103.29d {+06h 53m 09s}  +22.87d {+22d 52' 27"}
  SUN_DIST:         61.86 [deg]   Sun_angle= 4.7 [hr] (West of Sun)
  MOON_POSTN:      350.37d {+23h 21m 30s}   -8.06d {-08d 03' 24"}
  MOON_DIST:        83.29 [deg]
  MOON_ILLUM:      71 [%]
  GAL_COORDS:      129.66,  8.12 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:       62.01, 52.03 [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 = 144.49,4.50 [deg].  
  

  
• GCN Circular #22885
  E. Sonbas (Adiyaman Univ.), A. D'Ai (INAF-IASFPA), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team:
  At 05:36:42 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 180704A (trigger=846088). Swift did not immediately slew to the burst due to an Earth limb constraint. The BAT on-board calculated location is RA, Dec 32.638, +69.948 which is

     RA(J2000) = 02h 10m 33s
     Dec(J2000) = +69d 56' 52"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex set of peaks with a duration of about 25 sec. The peak count rate was ~4000 counts/sec (15-350 keV), at ~0 sec after the trigger.
  Due to an observing constraint, Swift will not slew until T0+48.1 minutes. There will be no XRT or UVOT data until this time.
  Burst Advocate for this burst is E. Sonbas (edasonbas AT yahoo.com). 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 NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 04 Jul 18 06:27:40 UT
  NOTICE_TYPE:     Swift-XRT Nack-Position
  TRIGGER_NUM:     846088,   Seg_Num: 0
  POINT_RA:         32.582d {+02h 10m 20s} (J2000)
  POINT_DEC:       +69.954d {+69d 57' 16"} (J2000)
  IMG_START_DATE:  18303 TJD;   185 DOY;   18/07/04
  IMG_START_TIME:  23171.90 SOD {06:26:11.90} UT,   2969.1 [sec] since BAT Trigger Time
  COUNTS:          15    Min_needed= 20
  STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
  PH2_ITER:        2    Max_iter_allowed= 4
  ERROR_CODE:      1
  COMMENTS:        SWIFT-XRT Nack Position.  
  COMMENTS:        No source found in the image.  
  

• GCN Circular #22886
  V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tiurina, A.Kuznetsov, V.Chazov, I. Gorbunov, D. Vlasenko, D.Zimnukhov, D.Kuvshinov, P.Balanutsa, V.Vladimirov Lomonosov Moscow State University,SAI
  R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias (IAC)
  A. Tlatov, V.Senik, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory
  R. Podesta, F. Podesta, C. Lopez, C.Francile Observatorio Astronomico Felix Aguilar (OAFA)
  H.Levato, Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
  D. Buckley South African Astronomical Observatory
  O. Gres, N.M.Budnev , Yu.Ishmuhametova Irkutsk State University
  A. Gabovich, V. Yurkov, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk
  MASTER-IAC robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) was pointed to the Swift BAT GRB180704A (Sonbas et al. GCN 22885) 25 sec after notice time and 41 sec after trigger time at 2018-07-04 05:37:23 UT. On our 10,20s exposure set there is no optical transient within SWIFT error-box (ra=32.6375 dec=69.9478 r=0.05). The 5-sigma upper limit has been about 14.2mag The message may be cited.
  ====================================================================
  The observations made on zenit distance = 48 degrees, galaxy latitude b = 8 degree. The moon (70 % bright part) is 54 degrees above the horizon. The distance between moon and object is 83 Observations started at twilight. The sun altitude is -7.5 degree, sunrise.
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 04 Jul 18 06:33:49 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     846088,   Seg_Num: 0
  POINT_RA:         32.575d {+02h 10m 18s} (J2000)
  POINT_DEC:       +69.956d {+69d 57' 21"} (J2000)
  POINT_ROLL:      99.951d
  IMG_START_DATE:  18303 TJD;   185 DOY;   18/07/04
  IMG_START_TIME:  23457.41 SOD {06:30:57.41} UT,   3254.6 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        2.583
  N_STARS:         153
  X_OFFSET:        634 [pixels]
  Y_OFFSET:        502 [pixels]
  X_MAX:           1593 [pixels]
  Y_MAX:           1461 [pixels]
  DET_THRESH:      13
  PHOTO_THRESH:    7
  SL_URL:          sw00846088000msufc3254.fits
  SUN_POSTN:       103.32d {+06h 53m 18s}  +22.87d {+22d 52' 16"}
  SUN_DIST:         61.90 [deg]   Sun_angle= 4.7 [hr] (West of Sun)
  MOON_POSTN:      350.80d {+23h 23m 13s}   -7.91d {-07d 54' 33"}
  MOON_DIST:        83.04 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      129.64,  8.12 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       61.99, 52.05 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 04 Jul 18 06:34:08 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     846088,   Seg_Num: 0
  POINT_RA:         32.575d {+02h 10m 18s} (J2000)
  POINT_DEC:       +69.956d {+69d 57' 21"} (J2000)
  POINT_ROLL:      99.951d
  IMG_START_DATE:  18303 TJD;   185 DOY;   18/07/04
  IMG_START_TIME:  23457.41 SOD {06:30:57.41} UT,   3254.6 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        2.583
  N_STARS:         153
  X_OFFSET:        634 [pixels]
  Y_OFFSET:        502 [pixels]
  X_MAX:           1593 [pixels]
  Y_MAX:           1461 [pixels]
  DET_THRESH:      13
  PHOTO_THRESH:    7
  SL_URL:          sw00846088000msufc3254.fits
  SUN_POSTN:       103.32d {+06h 53m 18s}  +22.87d {+22d 52' 16"}
  SUN_DIST:         61.90 [deg]   Sun_angle= 4.7 [hr] (West of Sun)
  MOON_POSTN:      350.81d {+23h 23m 13s}   -7.91d {-07d 54' 30"}
  MOON_DIST:        83.03 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      129.64,  8.12 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       61.99, 52.05 [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 04 Jul 18 06:33:33 UT
  NOTICE_TYPE:     Swift-XRT Position
  TRIGGER_NUM:     846088,   Seg_Num: 0
  GRB_RA:           32.6554d {+02h 10m 37.29s} (J2000),
                    33.0461d {+02h 12m 11.06s} (current),
                    31.6115d {+02h 06m 26.74s} (1950)
  GRB_DEC:         +69.9640d {+69d 57' 50.3"} (J2000),
                   +70.0505d {+70d 03' 01.9"} (current),
                   +69.7282d {+69d 43' 41.6"} (1950)
  GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       1.00e-10 [erg/cm2/sec]
  GRB_SIGNIF:      10.00 [sigma]
  IMG_START_DATE:  18303 TJD;   185 DOY;   18/07/04
  IMG_START_TIME:  23431.00 SOD {06:30:31.00} UT,   3228.2 [sec] since BAT Trigger Time
  TAM[0-3]:        100.00 100.00 100.00 100.00
  AMPLIFIER:       1
  WAVEFORM:        31
  SUN_POSTN:       103.32d {+06h 53m 18s}  +22.87d {+22d 52' 16"}
  SUN_DIST:         61.87 [deg]   Sun_angle= 4.7 [hr] (West of Sun)
  MOON_POSTN:      350.80d {+23h 23m 12s}   -7.91d {-07d 54' 35"}
  MOON_DIST:        83.06 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      129.66,  8.13 [deg] galactic lon,lat of the burst
  ECL_COORDS:       62.04, 52.04 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  COMMENTS:        TAM values, flux and significance fields are not valid.  
  COMMENTS:        This position was automatically generated on the ground using  
  COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
  COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
  COMMENTS:        The probability that this is a serendipitous source in the  
  COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 04 Jul 18 06:34:18 UT
  NOTICE_TYPE:     Swift-XRT Position UPDATE
  TRIGGER_NUM:     846088,   Seg_Num: 0
  GRB_RA:           32.6582d {+02h 10m 37.96s} (J2000),
                    33.0489d {+02h 12m 11.73s} (current),
                    31.6142d {+02h 06m 27.41s} (1950)
  GRB_DEC:         +69.9639d {+69d 57' 50.0"} (J2000),
                   +70.0504d {+70d 03' 01.5"} (current),
                   +69.7281d {+69d 43' 41.3"} (1950)
  GRB_ERROR:       2.4 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       1.00e-10 [erg/cm2/sec]
  GRB_SIGNIF:      10.00 [sigma]
  IMG_START_DATE:  18303 TJD;   185 DOY;   18/07/04
  IMG_START_TIME:  23431.00 SOD {06:30:31.00} UT,   3228.2 [sec] since BAT Trigger Time
  TAM[0-3]:        100.00 100.00 100.00 100.00
  AMPLIFIER:       1
  WAVEFORM:        31
  SUN_POSTN:       103.32d {+06h 53m 18s}  +22.87d {+22d 52' 15"}
  SUN_DIST:         61.87 [deg]   Sun_angle= 4.7 [hr] (West of Sun)
  MOON_POSTN:      350.81d {+23h 23m 14s}   -7.91d {-07d 54' 28"}
  MOON_DIST:        83.06 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      129.66,  8.13 [deg] galactic lon,lat of the burst
  ECL_COORDS:       62.04, 52.04 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
  COMMENTS:        TAM values, flux and significance fields are not valid.  
  COMMENTS:        This position was automatically generated on the ground using  
  COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
  COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
  COMMENTS:        This position was enhanced using UVOT field astrometry.  
  COMMENTS:        The probability that this is a serendipitous source in the  
  COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 04 Jul 18 06:35:25 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     846088,   Seg_Num: 0
  POINT_RA:         32.575d {+02h 10m 18s} (J2000)
  POINT_DEC:       +69.956d {+69d 57' 21"} (J2000)
  ROLL:            99.951d
  IMG_START_DATE:  18303 TJD;   185 DOY;   18/07/04
  IMG_START_TIME:  23457.41 SOD {06:30:57.41} UT,   3254.6 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     552378678
  X_OFFSET:        953 [pixels]
  Y_OFFSET:        821 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1113
  Y_GRB_POS:       981
  BINNING_INDEX:   1
  IM_URL:          sw00846088000msuni3276.fits
  SUN_POSTN:       103.32d {+06h 53m 18s}  +22.87d {+22d 52' 15"}
  SUN_DIST:         61.90 [deg]   Sun_angle= 4.7 [hr] (West of Sun)
  MOON_POSTN:      350.82d {+23h 23m 16s}   -7.90d {-07d 54' 17"}
  MOON_DIST:        83.03 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      129.64,  8.12 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       61.99, 52.05 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Image.  
  COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
  COMMENTS:        The image has 2x2 binning (compression).  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 04 Jul 18 06:35:37 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     846088,   Seg_Num: 0
  POINT_RA:         32.575d {+02h 10m 18s} (J2000)
  POINT_DEC:       +69.956d {+69d 57' 21"} (J2000)
  ROLL:            99.951d
  IMG_START_DATE:  18303 TJD;   185 DOY;   18/07/04
  IMG_START_TIME:  23457.41 SOD {06:30:57.41} UT,   3254.6 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     552378678
  X_OFFSET:        953 [pixels]
  Y_OFFSET:        821 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1113
  Y_GRB_POS:       981
  BINNING_INDEX:   1
  IM_URL:          sw00846088000msuni3276.fits
  SUN_POSTN:       103.33d {+06h 53m 18s}  +22.87d {+22d 52' 15"}
  SUN_DIST:         61.90 [deg]   Sun_angle= 4.7 [hr] (West of Sun)
  MOON_POSTN:      350.82d {+23h 23m 16s}   -7.90d {-07d 54' 15"}
  MOON_DIST:        83.03 [deg]
  MOON_ILLUM:      70 [%]
  GAL_COORDS:      129.64,  8.12 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       61.99, 52.05 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Processed Image.  
  COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
  COMMENTS:        The image has 2x2 binning (compression).  
  COMMENTS:        All 4 attachments are included.  
  

  
• GCN Circular #22887
  D.N. Burrows (PSU), J.A. Kennea (PSU), M. Perri (ASDC), G. Tagliaferri (INAF-OAB), P.A. Evans (U. Leicester) and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team:
  The XRT began observing the field of GRB 180704A at 06:26:11.9 UT, 2969.1 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 32.6592, 69.9641 which is equivalent to:

     RA(J2000)  = 02h 10m 38.22s
     Dec(J2000) = +69d 57' 50.7"
  

  with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 63 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 consistent with the Galactic value of 4.92 x 10^21 cm^-2 (Willingale et al. 2013).
• GCN Circular #22890
  P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
  Using 4046 s of XRT Photon Counting mode data and 7 UVOT images for GRB 180704A, 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 = 32.66048, +69.96408 which is equivalent to:

  RA (J2000): 02h 10m 38.51s
  Dec (J2000): +69d 57' 50.7"
  

  with an uncertainty of 1.5 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 #22893
  S.W.K. Emery (UCL-MSSL) and E. Sonbas (Adiyaman Univ.) and A. A. Breeveld (UCL-MSSL) report on behalf of the Swift/UVOT team:
  The Swift/UVOT began settled observations of the field of GRB 180704A 3255 s after the BAT trigger (Sonbas et al., GCN Circ. 22885). No optical afterglow consistent with the XRT position (Evans et al. GCN Circ. 22890) 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 exposures are:

  Filter         T_start(s)   T_stop(s)      Exp(s)         Mag
  
  white             3255         5455          537         >20.8
  v                 4233        10567         1082         >19.8
  b                 3618         5253          393         >19.9
  u                 3413         5048          393         >19.6
  uvw1                4643         4843          197         >19.2
  uvm2                4438        11190          804         >20.3
  uvw2                4028         9654         1082         >20.7
  

  The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.87 in the direction of the burst (Schlegel et al. 1998).
• GCN Circular #22894
  C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL), T. Sakamoto (AGU), E. Sonbas (Adiyaman Univ.), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
  Using the data set from T-239 to T+760 sec from recent telemetry downlinks, we report further analysis of BAT GRB 180704A (trigger #846088) Sonbas, et al., GCN Circ. 22885). The BAT ground-calculated position is RA, Dec = 32.605, 69.965 deg, which is

     RA(J2000)  =  02h 10m 25.1s 
     Dec(J2000) = +69d 57' 54.9" 
  

  with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 7%.
  The mask-weighted light curve shows several peaks, the first starting at ~T-21 sec, and the lagest peak at ~T+1 sec, with a long tail out to ~T+40 sec. T90 (15-350 keV) is 19.7 +- 1.4 sec (estimated error including systematics).
  The time-averaged spectrum from T-17.90 to T+4.24 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.22 +- 0.10. The fluence in the 15-150 keV band is 6.2 +- 0.4 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.04 sec in the 15-150 keV band is 9.6 +- 1.2 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/846088/BA/
• GCN Circular #22895
  Z. Liu (NAOC / U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and E. Sonbas report on behalf of the Swift-XRT team:
  We have analysed 7.9 ks of XRT data for GRB 180704A (Sonbas et al. GCN Circ. 22885), from 3.2 ks to 22.5 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 22890).
  The light curve can be modelled with an initial power-law decay with an index of alpha=0.91 (+/-0.12), followed by a break at T+13.2 ks to an alpha of 2.5 (+0.7, -0.6).
  A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.92 (+0.14, -0.13). The best-fitting absorption column is 8.3 (+1.2, -1.1) x 10^21 cm^-2, in excess of the Galactic value of 4.9 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.8 x 10^-11 (8.2 x 10^-11) erg cm^-2 count^-1.
  A summary of the PC-mode spectrum is thus:

  Total column:	     8.3 (+1.2, -1.1) x 10^21 cm^-2
  Galactic foreground: 4.9 x 10^21 cm^-2
  Excess significance: 4.9 sigma
  Photon index:	     1.92 (+0.14, -0.13)
  

  If the light curve continues to decay with a power-law decay index of 2.5, the count rate at T+24 hours will be 2.1 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.0 x 10^-13 (1.8 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/00846088.
  This circular is an official product of the Swift-XRT team.
• GCN Circular #22901
  V. Sharma, A. Vibhute and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the Astrosat CZTI collaboration:
  Analysis of Astrosat CZTI data showed the detection of a long GRB 180704A, which was also detected by Swift-BAT (Sonbas E. et al., GCN 22885) and Swift-XRT (Burrows D. N. et al., GCN 22887).
  The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 05:36:43.500 UT. The measured peak count rate is 660.2 cts/s above the background in combined data of four quadrants, with a total of 5324 cts. The local mean background count rate was 571.8 cts/s. Using cumulative rates, we measure a T90 of 26 s. In preliminary analysis, we find that 463 compton events are associated with this event.
  It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
  CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.
• GCN Circular #22918
  D. Frederiks, S. Golenetskii, R.Aptekar, A. Kozlova, A.Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report:
  The long GRB 180704A (Swift/BAT detection: Sonbas et al., GCN 22885; Markwardt et al., GCN 22894; AstroSat CZTI detection: Sharma et al., GCN 22901) triggered Konus-Wind at T0=3D20182.254 s UT (05:36:22.254).
  The KW light curve shows a multi-peaked structure with a total duration of ~40 s. A possible precursor is seen in the waiting mode data around T0 - 62 s. The emission is seen up to ~4 MeV.
  As observed by Konus-Wind, the burst had a fluence of (1.8 =B1 0.1)x10^-5 erg/cm2 and a 64-ms peak energy flux, measured from T0+20.352, of (2.4 =B1 0.2)x10^-6 erg/cm2 (both in the 20 keV - 10 MeV energy range).
  The time-integrated spectrum (measured from T0 to T0+24.832 s) is best fit in the 20 keV - 15 MeV range by a cutoff power-law (CPL) function with the following model parameters: the photon index alpha =3D -0.49(-0.13,+0.14), and the peak energy Ep =3D 183(-11,+33) keV, chi2 =3D 98/98 dof. Fitting this spectrum with the GRB (Band) function yields the same alpha and Ep, and only an upper limit on beta (<-3.2).
  The spectrum near the peak count rate (measured from T0+16.640 to T0+24.832 s) is best fit in the 20 keV - 15 MeV range by the CPL function with the following model parameters: the photon index alpha =3D -0.38(-0.20,+0.22), and the peak energy Ep =3D 163(-13,+15) keV, chi2 =3D 121/98 dof. Fitting this spectrum with the GRB (Band) function yields the same alpha and Ep, and only an upper limit on beta (<-3.2).
  The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB180704_T20182/
  All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary.