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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"

23608 results found.

  1. GRB 061028: Futher P200 Observations
  2. GRB 061028: P200 Observations
  3. GRB 061028: SARA upper limit
  4. GRB 061028: z band imaging
  5. GRB 061028, Swift-BAT refined analysis
  6. GRB 061028: TAROT Calern observatory late optical observations
  7. GRB 061028: TAROT Calern observatory optical observations
  8. GRB 061028: Swift detection of a burst
  9. GRB 061027, Swift refined analysis of a possible burst
  10. GRB 061027: Swift detection of a possible burst
  11. GRB061025: Swift/UVOT observations
  12. Swift XRT boresight update
  13. Konus-Wind observation of GRB 061021
  14. GRB 061021, Swift-BAT refined analysis
  15. GRB 061021: Swift detection of a burst
  16. GRB 061019: Super-LOTIS upper limit
  17. GRB060904b: optical observations
  18. GRB 060930: MARGE Optical Limits
  19. GRB 061019, Swift-BAT refined analysis
  20. GRB 061019: TAROT La Silla observatory optical observations
  21. GRB 061019: Swift-BAT detection of a burst
  22. GRB 060825: GORT Observations
  23. GRB 061007: RHESSI Spectral Fit
  24. GRB 061007: Suzaku/WAM observation of the prompt emission
  25. GRB 061006: astrometry-corrected XRT position
  26. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  27. GRB 061006 : Suzaku/WAM observation of the prompt emission
  28. GRB 061007: Swift-BAT refined analysis
  29. Konus-Wind observation of the short hard GRB 061006
  30. GRB 061007 - FTS early brightening and power law decay
  31. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  32. GRB 061007: Swift detection of a burst with an optical counterpart
  33. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  34. GRB 061006: Swift-XRT Team Refined Analysis
  35. GRB061006 (Swift 232585) might be a short-hard GRB
  36. GRB 060930: near-IR afterglow candidate retraction
  37. GRB 061006: Swift detection of a burst
  38. GRB 061004, Swift BAT refined analysis
  39. GRB 061004: Nearby 2MASS Galaxy
  40. GRB 061004: Swift detection of a burst
  41. GRB 060928: Suzaku/WAM observation of the prompt emission
  42. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  43. GRB 060928: Swift observations
  44. GRB 060928: RHESSI Spectral Fit
  45. IPN triangulation of GRB060928 (long, exceptionally bright)
  46. GRB 060930: near-IR afterglow candidate
  47. GRB061002 - SDSS Pre-Burst Observations
  48. GRB 061002, Swift-BAT refined analysis
  49. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  50. GRB 061002: Swift detection of a burst
  51. GRB060930: Faulkes Telescope South observation
  52. GRB 060930: Xinglong TNT optical observations
  53. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  54. GRB 060929: TNG K-band observations
  55. GRB 060929, Swift-BAT refined analysis
  56. GRB 060929: BART observation
  57. GRB 060929: Swift detection of a burst
  58. GRB060908: optical observations
  59. GRB 060729: An update on the late-time Swift observations
  60. GRB 060927: Swift XRT Team refined analysis
  61. GRB 060927, Swift-BAT refined analysis
  62. GRB060927: Faulkes Telescope South observation
  63. GRB 060926: MASTER: first minutes decay
  64. GRB060927 - SDSS Pre-Burst Observations
  65. Swift XRT boresight
  66. GRB 060927: Swift detection of a burst
  67. GRB 060926: OPTIMA-Burst -- further observations
  68. GRB 060926: Swift XRT refined analysis
  69. GRB 060926, Swift-BAT refined analysis
  70. GRB 060926: MASTER OT alert observation
  71. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  72. GRB 060912A: Redshift of probable host galaxy
  73. GRB 060926: Watcher observations
  74. GRB060926 OPTIMA-Burst optical observation
  75. GRB 060926: Swift detection of a burst
  76. GRB 060923C, Swift-BAT refined analysis
  77. GRB060923B: Swift/UVOT upper limits
  78. GRB 060923B: Swift XRT Refined Analysis
  79. GRB 060923C: Swift XRT refined analysis
  80. GRB 060923C, Swift-BAT partial refined analysis
  81. GRB 060923A: Swift XRT refined analysis
  82. GRB 060923B, Swift-BAT refined analysis
  83. GRB060923C : Faulkes Telescope South optical limits
  84. GRB060923C: Faulkes Telescope North optical observations
  85. GRB 060923C: optical observation
  86. GRB 060923C: Swift detection of a burst
  87. GRB 060923B: Swift detection of a burst
  88. GRB 060923, Swift-BAT refined analysis
  89. GRB 060923: Early Super-LOTIS Observations
  90. GRB 060923: UKIRT nIR observations - candidate afterglow
  91. GRB060923 - SDSS Pre-Burst Observations
  92. GRB 060923: KAIT observations
  93. GRB 060923: Swift detection of a burst
  94. Swift detection of IGR J17497-2821 (trigger 230504)
  95. GRB 060919 : Faulkes South Telescope Observations
  96. GRB 060919, Swift-BAT refined analysis
  97. GRB 060919: TAROT optical observations
  98. GRB 060919: Swift detection of a burst
  99. GRB060825: MAGIC telescope GeV observation
  100. Konus-Wind observation of GRB 060912

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