SIMPLE = T / file does conform to FITS standard BITPIX = 8 / number of bits per data pixel NAXIS = 1 / number of data axes NAXIS1 = 0 / length of data axis 1 EXTEND = T / FITS dataset may contain extensions COMMENT FITS (Flexible Image Transport System) format is defined in 'AstronomyCOMMENT and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H HISTORY fimgcreate 1.0b at 2025-05-30T05:57:12 DATE = '2025-05-30T05:57:12' / file creation date (YYYY-MM-DDThh:mm:ss UT) INSTRUME= 'UVOT ' TSTART = 769401921.1783 TSTOP = 769402798.0936 DATE-OBS= '2025-05-20T02:42:11' DATE-END= '2025-05-20T02:59:53' OBJECT = 'GRB250520a' XOBS_ID = 01315630000 / Generating sequence PROCVER = '3.20.02 ' / Processing script version SOFTVER = 'Hea_21Mar2024_V6.33.1_Swift_Rel5.8(Bld47)_30Jun2023_SDCpatch_2' CALDBVER= 'b20230607_u20240201_x20240522_m20250515' / CALDB index versions used TIMESYS = 'TT ' / time system MJDREFI = 51910 / MJD reference day 01 Jan 2001 00:00:00 MJDREFF = 0.00074287037 / MJD reference (fraction of day) 01 Jan 2001 00:CLOCKAPP= F / If clock correction are applied (F/T) TIMEUNIT= 's ' / Time unit for timing header keywords UTCFINIT= -35.6353600000000 / [s] UTCF at TSTART CHECKSUM= 'ZjVAbjT9ZjTAbjT7' / HDU checksum updated 2025-05-30T06:14:41 DATASUM = ' 0' / data unit checksum updated 2025-05-30T06:14:41 END XTENSION= 'IMAGE ' / IMAGE extension BITPIX = 32 / number of bits per data pixel NAXIS = 2 / number of data axes NAXIS1 = 160 / length of data axis 1 NAXIS2 = 160 / length of data axis 2 PCOUNT = 0 / required keyword; must = 0 GCOUNT = 1 / required keyword; must = 1 MESGNAME= 'UVOT_GENI_IMAGE' / Name of the message TELESCOP= 'SWIFT ' / Telescope (mission) name INSTRUME= 'UVOTA ' / Instrument name OBS_ID = '01315630000' / Observation ID TARG_ID = '1315630 ' / Target ID SEG_NUM = '0 ' / Segment number CREATOR = 'TDRSS2FITS V3.22' / Program that created this FITS file ORIGIN = 'GSFC ' / Source of FITS file TLM2FITS= 'V3.22 ' / Telemetry converter version number EQUINOX = 2000 / Equinox RADECSYS= 'FK5 ' / Coordinates system TIMESYS = 'TT ' / Time system MJDREFI = 51910. / Reference MJD Integer part MJDREFF = 0.00074287037 / Reference MJD fractional TIMEUNIT= 's ' / Time unit for the time header keywords TIERRELA= 1.0E-8 / [s/s] relative errors expressed as rate TIERABSO= 1.0 / [s] timing precision in seconds CLOCKAPP= F / If clock correction are applied (F/T) TIMEREF = 'LOCAL ' / Time reference (barycenter/local) TASSIGN = 'SATELLITE' / Time assigned by clock DATE = '2025-05-30T05:49:03' / file creation date (YYYY-MM-DDThh:mm:ss UT) UTCFINIT= -35.6353600000000 / [s] UTCF at TSTART TSTART = 769401921.1783 / Start time DATE-OBS= '2025-05-20T02:45:16' TSTOP = 769402071.02422 / Stop time DATE-END= '2025-05-20T02:47:46' TELAPSE = 149.845919966698 / TSTOP - TSTART ONTIME = 149.845919966698 / Sum of GTIs LIVETIME= 149.845919966698 / Ontime multiplied by DEADC EXPOSURE= 149.845919966698 / Total exposure, with all known correction DEADC = 1. / dead time correction EXTNAME = 'wh769401921I' / Extension name HDUCLASS= 'OGIP ' / Format conforms to OGIP standards HDUCLAS1= 'IMAGE ' / Image data HDUCLAS2= 'TOTAL ' / Total data values DATAMODE= 'IMAGEEVENT' / Instrument operating mode EXPID = 769401921 / uvot EXPosure ID FILTER = 'WHITE ' / FILTER used in exposure DETNAM = '2000 ' / WHEELPOS RA_PNT = 282.260235552705 / [deg] Ra Pointing DEC_PNT = -11.8377139303397 / [deg] Dec Pointing PA_PNT = 73.36587 / [deg] Position angle (roll) WINDOWX0= 867 / Lower left hand X WINDOWY0= 919 / Lower left hand Y WINDOWDX= 320 / X Window width WINDOWDY= 320 / Y Window width NFRAMES = 13573 / number of frames included GRBLOC = 0 / GRB Location 1=XRT 0=MODE CMD BPEHWIN = 0 / BPE hardware window height BINX = 2 / Binning in the x-axis BINY = 2 / Binning in the y-axis CMPCNTMN= F / Compression losses didn't occurred in the imageCMPOTHRS= 8191 / Overflow of lossy compression algorithm CMPUTHRS= -8192 / Underflow of lossy compression algorithm CTYPE1 = 'RAWX ' / WCS axis type CUNIT1 = 'pixel ' / WCS axis unit CRVAL1 = 867.5 / WCS reference value CDELT1 = 2 / WCS coordinate increment CRPIX1 = 1. / WCS Reference point CTYPE2 = 'RAWY ' / WCS axis type CUNIT2 = 'pixel ' / WCS axis unit CRVAL2 = 919.5 / WCS reference value CDELT2 = 2 / WCS coordinate increment CRPIX2 = 1. / WCS Reference point UTCCTIME= -35.63536 / [s] UTC Correction time UTCCSEC = -36 / UTC Correction Seconds UTCCSUBS= 18232 / [2*10**(-5) s] UTC Correction SubSeconds PKTTIME = 769402097.37612 / [s] ccsds PacKeT TIME=PKTSEC+PKTSUBS*2e-5 PKTSEC = 769402097 / ccsds PacKeT SEConds PKTSUBS = 18806 / [2*10**(-5) s] ccsds PacKeT SUBSeconds APID = 843 / Application Process Identifier BLANK = -2147483648 / Data null value CHECKSUM= 'GOWbIOTZGOTbGOTZ' / HDU checksum updated 2025-05-30T06:14:41 DATASUM = '462770 ' / data unit checksum updated 2025-05-30T05:49:03 PROCVER = '3.20.02 ' / Processing script version SOFTVER = 'Hea_21Mar2024_V6.33.1_Swift_Rel5.8(Bld47)_30Jun2023_SDCpatch_2' CALDBVER= 'b20230607_u20240201_x20240522_m20250515' / CALDB index versions used END )6:9 #+4 ) ! ! #" OdE! . +t��o "Y��{e# .5 Ct��I" -]��2 :ZspnP$ 'Z��I '0>F=B# /\��B !%' J[p~N !BG:+* ) .2 EzG& o�( `1 !�,B$| &$' A��L # )" "?I/"('! #IsR. +<>& $7=. "'' + 489+ $ 0" #@-' ( 0B5 -83 7=@( 5z�m' !;I/ %V��s@ )@C4 (21 ;�sB1 3MKN' 4?, )@3 -;>; '& 3@" ' # %# '' 2(( -$ # - ,.-$ /" '34 %+8' ' 6K- !)/M6 #i�q: .pu)IV3% 1xyT= ;��\"6=" 1QJ6 O��f) A<4! ([�xK- )'5/$ #,LN ((0 #%. & # &!' ' 6F6! !;,# 9j��:! -8 # "$%+ !5n�i@ &7<( ! $ &/4 5 *# 3PM7%#JeQ 382& &62B !-%(4 &)( " $"%}��iC(*'* " !)'" ,4:''P��7! !\��U-/ ')" ** F�b-n+ #<XC'" + " &'$ h�4}6 # #2$$ "%')! -��t# - 4[I8 # ( '3% "+4 $&$ $" 7B,3@VS- .6;&4?GK: )1.-*D99, %#"!$ !3, % '$ "" ) ' ! !% ./ # !/& )#!!$ " " ! ) ' *2@ !-C�s*2'8= R~?�E&1+.& -&3! $ fI��(!) //;" %�� # ' )'0! $' %��< ?Zz��# 1! <��!��Q & !.) `��^C A U�K 0R�� " 0D; `��A ! #.J�e. %Q��C! *?? # ,][?< "fnV7 -]��F A,#(># 1'( 5��- $ v��C$ I��v&?;!!)% !_q��& d��;! YM*"'1)'7$ " !!*�"�y %!+3 ,'3',*% *P��}O! '"0''+7 -;Q: &"!02PWI-1 $( $,8LF;$?' '% "#$91&#9 " " " !/! ' !=A% " .4 ' *2CY4 $$$ $ 'F$ #& )! , " /OQ* $ ;j��R +=! 7W�h5 %A3 4Y?" ) $2 " # 7^ EX " ! # *> 4@! ! 9Uj1 FWW9 +$# $C> # !$$ !" 64K* #( !1@2 -JI 0"& ,AA=% '65) $ $;D* !%+! &E��n, 8-- ! 1�~[# 5?@/ R�v�� (C6" Q*��?P % -h��-' *B? $& 0!! %**%'&) .)) !( $4/" '"/D& $4# "!!78./W�D- IUb6/%Qy�K >. 8ML<$PR7 ! +7cK/ *=%!'0( )/. (QZU9 +* ;E* !" $+#! # 1K_& &T\R3 !6@C ,1 "GrD! XTENSION= 'IMAGE ' / IMAGE extension BITPIX = 32 / number of bits per data pixel NAXIS = 2 / number of data axes NAXIS1 = 160 / length of data axis 1 NAXIS2 = 160 / length of data axis 2 PCOUNT = 0 / required keyword; must = 0 GCOUNT = 1 / required keyword; must = 1 MESGNAME= 'UVOT_GENI_IMAGE' / Name of the message TELESCOP= 'SWIFT ' / Telescope (mission) name INSTRUME= 'UVOTA ' / Instrument name OBS_ID = '01315630000' / Observation ID TARG_ID = '1315630 ' / Target ID SEG_NUM = '0 ' / Segment number CREATOR = 'TDRSS2FITS V3.22' / Program that created this FITS file ORIGIN = 'GSFC ' / Source of FITS file TLM2FITS= 'V3.22 ' / Telemetry converter version number EQUINOX = 2000 / Equinox RADECSYS= 'FK5 ' / Coordinates system TIMESYS = 'TT ' / Time system MJDREFI = 51910. / Reference MJD Integer part MJDREFF = 0.00074287037 / Reference MJD fractional TIMEUNIT= 's ' / Time unit for the time header keywords TIERRELA= 1.0E-8 / [s/s] relative errors expressed as rate TIERABSO= 1.0 / [s] timing precision in seconds CLOCKAPP= F / If clock correction are applied (F/T) TIMEREF = 'LOCAL ' / Time reference (barycenter/local) TASSIGN = 'SATELLITE' / Time assigned by clock DATE = '2025-05-30T05:49:03' / file creation date (YYYY-MM-DDThh:mm:ss UT) UTCFINIT= -35.6354000000000 / [s] UTCF at TSTART TSTART = 769402648.23664 / Start time DATE-OBS= '2025-05-20T02:57:23' TSTOP = 769402798.0936 / Stop time DATE-END= '2025-05-20T02:59:53' TELAPSE = 149.856960058212 / TSTOP - TSTART ONTIME = 149.856960058212 / Sum of GTIs LIVETIME= 149.856960058212 / Ontime multiplied by DEADC EXPOSURE= 149.856960058212 / Total exposure, with all known correction DEADC = 1. / dead time correction EXTNAME = 'wh769402648I' / Extension name HDUCLASS= 'OGIP ' / Format conforms to OGIP standards HDUCLAS1= 'IMAGE ' / Image data HDUCLAS2= 'TOTAL ' / Total data values DATAMODE= 'IMAGEEVENT' / Instrument operating mode EXPID = 769402648 / uvot EXPosure ID FILTER = 'WHITE ' / FILTER used in exposure DETNAM = '2000 ' / WHEELPOS RA_PNT = 282.259581769932 / [deg] Ra Pointing DEC_PNT = -11.8385466526292 / [deg] Dec Pointing PA_PNT = 73.36765 / [deg] Position angle (roll) WINDOWX0= 867 / Lower left hand X WINDOWY0= 919 / Lower left hand Y WINDOWDX= 320 / X Window width WINDOWDY= 320 / Y Window width NFRAMES = 13574 / number of frames included GRBLOC = 0 / GRB Location 1=XRT 0=MODE CMD BPEHWIN = 0 / BPE hardware window height BINX = 2 / Binning in the x-axis BINY = 2 / Binning in the y-axis CMPCNTMN= F / Compression losses didn't occurred in the imageCMPOTHRS= 8191 / Overflow of lossy compression algorithm CMPUTHRS= -8192 / Underflow of lossy compression algorithm CTYPE1 = 'RAWX ' / WCS axis type CUNIT1 = 'pixel ' / WCS axis unit CRVAL1 = 867.5 / WCS reference value CDELT1 = 2 / WCS coordinate increment CRPIX1 = 1. / WCS Reference point CTYPE2 = 'RAWY ' / WCS axis type CUNIT2 = 'pixel ' / WCS axis unit CRVAL2 = 919.5 / WCS reference value CDELT2 = 2 / WCS coordinate increment CRPIX2 = 1. / WCS Reference point UTCCTIME= -35.6354 / [s] UTC Correction time UTCCSEC = -36 / UTC Correction Seconds UTCCSUBS= 18230 / [2*10**(-5) s] UTC Correction SubSeconds PKTTIME = 769402811.29556 / [s] ccsds PacKeT TIME=PKTSEC+PKTSUBS*2e-5 PKTSEC = 769402811 / ccsds PacKeT SEConds PKTSUBS = 14778 / [2*10**(-5) s] ccsds PacKeT SUBSeconds APID = 843 / Application Process Identifier BLANK = -2147483648 / Data null value CHECKSUM= 'hVZYjVZVhVZVhVZV' / HDU checksum updated 2025-05-30T06:14:42 DATASUM = '528222 ' / data unit checksum updated 2025-05-30T05:49:03 PROCVER = '3.20.02 ' / Processing script version SOFTVER = 'Hea_21Mar2024_V6.33.1_Swift_Rel5.8(Bld47)_30Jun2023_SDCpatch_2' CALDBVER= 'b20230607_u20240201_x20240522_m20250515' / CALDB index versions used END " " /V< ) $ ?u��5 " )@��t1 %" ! # $c��c## & B~�K ' 0rsb[: -C�a' % )NNXN0 &M��N 1, 3k��u( !/S]A9 #0& %?4) !�w- IC�Z�. ##"-'' 9��S% #' "* :DG$$'A+) /rS! $G64 &' U^K* "0-. /' 9M@" ! +<" # #-3' ( %# %2H=$ /+ >YL& "S��> >C3 B��F! -E8 4/ 4n�E0# DiQ. #IQ* (C,$ #CYB ):) 9?0$ ( &* % )# ( %/! %$'# "80# & )3% #& .) 0=1 ./ !$ 0-, "5<;& $ )" # $/A 6G! L��F" 'H^)DtZ*% ! ){�w8% %Y�r6&7K< $!3YU2! 0��t* & 8I9 0P��[ 8C9% !.Km-" 7@%$' (#) %'# & ($3 %" )"#! " 585 ! 0>% " -k��^ 0 ! 7=, 1u��O$ (F\/ $% G5 "/.! *,!',<.!->Bl/ @D##!+B?' *% 02 0+&' !'&+ J��^@##) #$ /,! GPY* *wE #;!R��6," ! "4.- 2*) (u1Q�- # $ &Lf4- ".# ?��;$ 17" ,+8# % -g�{8 ;, ?S? $ "$ &.4 "-#' ! '" $' !4=8$1P^G $:<>8TVh/" &3346NC# &"! '&%' ! & &/ !($0$ %'$"&! ! $ &#"%"##! ! %) ! <# % #(, $- ! $!! !'$ ' +! # #" # D%%/* *' ( .,S*28> + # "�� e/3) ( 60& )., ��7" & ' (;< '$�Bp&"! " *-. #!$rnF"'! 9�9 & ;\��9%& #)''#S��=!*, & !' )3 & .�v-) =' " ! # " @Jf & 6wr;, % !�. 0E# :��j "# ) * h (L��A *>��U ,A% !%( *Ikk/ %I�l. "@��\ !) $! 52 ," 8�_�6# & :z�I1% 1��"�0 AL) ("% 5��. H��Y _~D%)%(@.B:# ##"%!#!' M�}&�0 &" -2! 6B 7*2" .h��N$ ! &*F.-& ! !FfF!& " 1URG?", $ $)*$0 ,'@ga80C@-" 7.%% -%#. "7?""*(' % "&' !& ( %%% !4W? !!'"&3B'! "#$! !:Pi=! (#% &$ (/B+ & ' $33" "' 6F/ * c��T1 $ % 0B$ #t��K "% ,;E1 0HM$ 33 #$ ' &#W # Dk $! $4! 2-+ #% <Wo9 "# >]oI! %,$ ! +CQ* # % $'& -DR+ )! $! IP9# *W@0 ! !4+ -U^Q %;H8 # # !6/+" & ' (" &1]�^/ *<$ " \��_v" %X[& &��7�!#8H% %9cy�# + Q��o@. ")0# " ! " - &6-1$ %?3' $,C4#;<) .!"0) $)+( %"9%#A�{, ! & (^�X.!!T��* +( 2foF#If? && %=dV5% ".A', "98 .Nh_* # :B1%!1g@ %&% #"8 & &BTC )Mgp:" $?_M8 )1 ! ! ! " "& ,2A1 #*A. ,U�cc# 69-( K��o .)" 6��G # %0 )X�'�,