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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

42876 results found.

  1. GRB 050911: Swift-BAT refined analysis
  2. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  3. GRB 050911: z~0.16 cluster in the field
  4. GRB050911: Swift-BAT detection of a long burst
  5. GRB050908: detection of Swift/UVOT optical counterpart
  6. GRB 050910a: TAROT early optical limits
  7. RBO GRB 050908 observations
  8. WIRO observations in I of GRB 050908
  9. GRB 050906: Possible X-ray Counterpart
  10. GRB 050906: RTT150 optical observations
  11. GRB050908: Swift/UVOT Early upper limits
  12. GRB050908: VLT R-band decay index.
  13. GRB050908 : Swift-XRT refined analysis
  14. GRB 050908: Swift-BAT refined analysis
  15. GRB 050908: Optical observations
  16. Gemini Spectroscopy of GRB 050908
  17. GRB 050908: spectroscopic redshift
  18. GRB 050908: Prompt PROMPT Observations
  19. GRB 050908 : Swift XRT position
  20. GRB 050908: KAIT observations
  21. GRB 050908: P60 Confirmation of Optical Afterglow
  22. GRB 050908: Optical Observations
  23. GRB 050908: Swift detection of a burst
  24. Swift trigger 154073 is not a GRB
  25. GRB 050906: Optical observations at the Very Large Telescope
  26. GRB 050904 BAT refined analysis of complete data set
  27. GRB 050906: MARGE Optical Limits
  28. GRB 050906: Swift-BAT refined analysis
  29. GRB 050906: Swift XRT upper limit
  30. GRB 050906: Radio Observations
  31. GRB 050904: Keck I-band Imaging
  32. GRB050906: P60 Observations
  33. GRB 050904: more VLT NIR observations
  34. GRB 050904: BOOTES early R-band observation
  35. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  36. GRB 050906: Bright galaxy in BAT error box
  37. GRB 050906: Swift/BAT Detection of a possible burst
  38. GRB 050904: More SOAR
  39. GRB 050904: photometric redshift
  40. GRB 050904: Swift/UVOT observations
  41. GRB 050904: Afterglow Astrometry
  42. GRB 050904: NIR object inside the XRT error box
  43. GRB 050904: early Swift XRT analysis results
  44. GRB 050904: SOAR YJ and PROMPT Ic Observations
  45. GRB 050904: BAT refined analysis of partial data set
  46. GRB 050904: TAROT optical measurements
  47. GRB050904: Optical Observations
  48. GRB 050904: Environmental Constraints
  49. GRB 050904: Possible High-Redshift GRB
  50. GRB 050904: SOAR/PROMPT Observations
  51. GRB050904: P60 Observations
  52. GRB 050904: TAROT optical limits
  53. GRB050904: Swift-BAT detection of a probable burst
  54. Swift-BAT triggers 153461-153465 are not GRBs
  55. Retraction of Swift-BAT trigger #153355
  56. GRB 050824: MDM Observations
  57. GRB 050827: Swift XRT preliminary analysis results
  58. IBAS Alerts 2641 and 2642: not a real GRB
  59. Swift Trigger #152652 is not a GRB
  60. GRB 050827 : OSN 1.5m optical observations
  61. GRB 050827: P200 NIR Observations
  62. GRB050827: Swift/UVOT upper limits
  63. GRB 050827: Optical Limit
  64. GRB 050827: XRT possible afterglow detection
  65. GRB050824: Maidanak optical limits
  66. GRB050820A: RTT150 optical observations
  67. GRB050827: RTT150 optical observations
  68. GRB 050827: Swift-BAT refined analysis
  69. GRB050827: Swift-BAT detection of a burst
  70. Subaru Observations of GRB050724
  71. GRB 050826: Optical Candidate
  72. GRB050824, HETE-2 Observation
  73. GRB 050826: Swift XRT preliminary analysis results
  74. GRB 050826: BAT refined analysis
  75. GRB050826: Swift/UVOT early upper limits
  76. GRB 050826: Swift XRT position
  77. GRB050826: Swift-BAT detection of a long burst
  78. Possible GRB050825:MASTER optical observations
  79. Swift-BAT trigger 152038 is definitely not a GRB
  80. GRB050824: CORRECTION to UVOT observing times
  81. Swift-BAT trigger 152038 is probably not a GRB
  82. GRB050824: Swift/UVOT detection of fading afterglow
  83. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  84. GRB050824, I-band imaging
  85. GRB050824: Radio Observations
  86. GRB 050824: Spectroscopic redshift from the VLT
  87. GRB 050822: refined XRT analysis
  88. GRB 050824: XRT refined analysis and possible afterglow detection
  89. GRB 050824: BAT refined analysis of a soft weak burst
  90. GRB050824: MASTER:OT decay
  91. GRB050824: Swift-BAT detection of a burst
  92. GRB 050824 optical candidate
  93. GRB050820A: RTT150 optical observations
  94. GRB050815: Maidanak optical observation
  95. XRF050509c: Radio upper limits from GMRT
  96. VLT/UVES spectroscopy of GRB050820
  97. GRB050822: Swift/UVOT upper limits
  98. GRB 050820A BAT observations of second, larger episode of emission
  99. GRB 050822: Swift-BAT refined analysis
  100. GRB050525, GRB050607, GRB050802 BVRcIc field photometry

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