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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

25840 results found.

  1. GRB 061028: TAROT Calern observatory optical observations
  2. GRB 061028: Swift detection of a burst
  3. GRB 061027, Swift refined analysis of a possible burst
  4. GRB 061027: Swift detection of a possible burst
  5. GRB061025: Swift XRT refined analysis
  6. GRB061025: Swift/UVOT observations
  7. GRB 061025: REM observations
  8. GRB061025: Swift XRT position
  9. GRB 061025: ROTSE-III Optical Limits
  10. GRB 061025: a long GRB detected by INTEGRAL
  11. Konus-Wind observation of GRB 061021
  12. GRB 061021: Swift-XRT refined analysis
  13. GRB 061021: Swift/UVOT Observation
  14. GRB 061021: Swift detection of a burst
  15. GRB 061019: SARA upper limit
  16. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  17. GRB 060930: MARGE Optical Limits
  18. GRB 061019: Swift/UVOT upper limit
  19. GRB061019: Swift XRT refined analysis
  20. GRB 061019: TAROT La Silla observatory optical observations
  21. GRB 061019: REM K-band candidate afterglow
  22. GRB 061019: Swift-BAT detection of a burst
  23. GRB 061007: RHESSI Spectral Fit
  24. GRB 061006: astrometry-corrected XRT position
  25. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  26. GRB061007: Swift UVOT followup observations
  27. GRB 061006: optical afterglow
  28. GRB 061006 : Suzaku/WAM observation of the prompt emission
  29. GRB 061007: OA fading and VLT redshift
  30. GRB 061007: Correction to GCN 5712
  31. GRB 061007: Swift XRT refined analysis
  32. GRB 061006: Swift/UVOT optical observations
  33. Konus-Wind observation of the short hard GRB 061006
  34. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  35. GRB 061007: Swift detection of a burst with an optical counterpart
  36. GRB 061006: VLT observation
  37. GRB 061006: Swift-XRT Team Refined Analysis
  38. GRB 060930: near-IR afterglow candidate retraction
  39. GRB 061004: Optical afterglow candidate and redshift
  40. GRB 061004: Swift-XRT Team Refined Analysis
  41. GRB 061004: Swift detection of a burst
  42. GRB 060928: 2 pseudo-z from 2 detections spectral parameters
  43. Konus-Wind observation of GRB 060928
  44. GRB 060928: Suzaku/WAM observation of the prompt emission
  45. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  46. GRB 060928: Swift observations
  47. GRB 060928: RHESSI Spectral Fit
  48. IPN triangulation of GRB060928 (long, exceptionally bright)
  49. GRB 060930: near-IR afterglow candidate
  50. GRB 061002: Swift-XRT Team Refined Analysis
  51. VLA observations of GRB 060926
  52. GRB061002 - SDSS Pre-Burst Observations
  53. GRB 060908: Detection of a possible host
  54. GRB 060923A: Probable host galaxy in the R-band
  55. GRB 060807: Detection of a possible host galaxy
  56. GRB 060923A: VLA K-band Observations
  57. GRB 060930: Xinglong TNT optical observations
  58. GRB 060929: Further XRT Refined Analysis
  59. GRB 060929: Swift/UVOT Optical Observations
  60. GRB060929: Swift-XRT refined analysis.
  61. GRB 060929: TNG K-band observations
  62. GRB060929: Optical limit
  63. GRB 060929: BART observation
  64. Liverpool Telescope observations of GRB 060929
  65. GRB060908: optical observations
  66. GRB 060927: Swift/UVOT Optical Observations
  67. GRB 060927: Swift XRT Team refined analysis
  68. GRB 060927 optical limit
  69. GRB 060927, Swift-BAT refined analysis
  70. GRB 060927: Xinglong TNT optical observations
  71. GRB 060927, optical observation
  72. GRB060927 - SDSS Pre-Burst Observations
  73. Swift XRT boresight
  74. GRB 060926: Swift-UVOT Detections
  75. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  76. GRB 060926: Swift XRT refined analysis
  77. GRB 060926, Swift-BAT refined analysis
  78. GRB 060923A: Radio Observations
  79. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  80. GRB 060923C, Swift-BAT refined analysis
  81. GRB 060923C: VLA Observation
  82. GRB 060923C: NIR afterglow confirmed
  83. GRB060923C: AROMA optical obsevation
  84. GRB 060923C, optical observation
  85. GRB 060923C: VLT J-band observations
  86. GRB 060923B: Swift XRT Refined Analysis
  87. GRB 060923C: Swift XRT refined analysis
  88. GRB 060923A: Swift XRT refined analysis
  89. GRB 060923A: Keck and Gemini Observations
  90. GRB 060923C: Xinglong TNT optical observations
  91. GRB 060923C: Swift detection of a burst
  92. GRB 060923B: Swift detection of a burst
  93. GRB 060923: UKIRT nIR observations - candidate afterglow
  94. GRB060923 - SDSS Pre-Burst Observations
  95. GRB 060923: Swift detection of a burst
  96. GRB 060919 : Faulkes South Telescope Observations
  97. GRB060919: XRT refined analysis
  98. GRB 060919: TAROT optical observations
  99. GRB 060919: Swift detection of a burst
  100. GRB 060912A: VLA Observation

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