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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"

32765 results found.

  1. GRB061121, optical observation
  2. GRB 061121: Optical observation at the KANATA 1.5m telescope
  3. GRB 061121: Faulkes Telescope North Optical Observation
  4. GRB061121: Spectroscopic Redshift
  5. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  6. GRB 060605: NIR Observations
  7. GRB 050915B: optical afterglow
  8. GRB 060111B: Swift UVOT Refined Magnitudes
  9. GRB061110A: Correction to GCN5817
  10. GRB 061110A: refined R-band analysis
  11. GRB 061110B: NIR Observations
  12. Swift/UVOT Upper Limits for GRB061110b
  13. Swift/UVOT Upper Limits for GRB061110a
  14. GRB 061110B: Swift XRT refined analysis
  15. GRB 061110B, Swift-BAT refined analysis
  16. GRB 061110B: VLT redshift
  17. GRB 061110B: NOT optical observations
  18. GRB 061110A: Swift XRT refined analysis
  19. GRB 061110B: Swift/XRT position
  20. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  21. GRB 061110A, Swift-BAT refined analysis
  22. GRB 061110: ROTSE-III Optical Limits
  23. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  24. GRB 061109: optical observation
  25. GRB061028: MAGIC telescope GeV observation
  26. GRB 061007: Third Epoch ATCA Radio Observations
  27. GRB061019: second epoch CrAO observations
  28. GRB 061028: Swift/XRT Astrometry Correction
  29. GRB 061102: Swift/UVOT Magnitude Upper Limits
  30. GRB 061102, XRT refined analysis
  31. GRB 061004: Further VLT/NTT observations
  32. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  33. GRB061102B: Super-LOTIS observations
  34. GRB 061028: Optical R passband observations
  35. GRB 061102, Swift-BAT refined analysis
  36. GRB 061028: VLA Observation
  37. GRB 061004: Swift/XRT Astrometry Correction
  38. GRB 060801: Swift/XRT Astrometry Correction
  39. GRB 061028: Futher P200 Observations
  40. GRB 061028: MDM Observations
  41. GRB 061028: P200 Observations
  42. GRB 061028: SARA upper limit
  43. GRB 061028: z band imaging
  44. GRB061028: XRT refined analysis
  45. GRB 061028: Swift/UVOT Observations
  46. GRB 061028, Swift-BAT refined analysis
  47. GRB 061027, Swift refined analysis of a possible burst
  48. GRB061025: ROTSE-III Confirmation of Optical Counterpart
  49. GRB061025: Swift XRT refined analysis
  50. GRB061025: Swift/UVOT observations
  51. GRB 061019: MITSuME upper limits
  52. GRB 061025: REM observations
  53. GRB 061025: Gemini-S observations
  54. GRB061025: Swift XRT position
  55. GRB 061025: ROTSE-III Optical Limits
  56. Swift XRT boresight update
  57. GRB 061021, Swift-BAT Lag analysis
  58. Konus-Wind observation of GRB 061021
  59. GRB 061021 - VLT spectrum without lines
  60. GRB 061021: Swift-XRT refined analysis
  61. GRB 061021: Swift/UVOT Observation
  62. GRB 061021, Swift-BAT refined analysis
  63. GRB 061019: Super-LOTIS upper limit
  64. GRB060904b: optical observations
  65. GRB061019: optical observations
  66. GRB061019: optical observations
  67. GRB 061019: SARA upper limit
  68. GRB 060930: MARGE Optical Limits
  69. GRB 061019: Swift/UVOT upper limit
  70. GRB 061019: SMARTS afterglow confirmation
  71. GRB061019: Swift XRT refined analysis
  72. GRB 061019, Swift-BAT refined analysis
  73. GRB 061019: REM K-band candidate afterglow
  74. GRB061019: Swift/XRT position
  75. GRB 060825: GORT Observations
  76. GRB 061007: Second Epoch ATCA Radio Observations
  77. GRB 061007: RHESSI Spectral Fit
  78. GRB 061007: Suzaku/WAM observation of the prompt emission
  79. GRB 061006: astrometry-corrected XRT position
  80. Konus-Wind observation of GRB 061007
  81. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  82. GRB 061007: ATCA Radio Observations
  83. GRB061007: Swift UVOT followup observations
  84. GRB 061006: optical afterglow
  85. GRB 061007: OA fading and VLT redshift
  86. GRB 061007: Magellan Spectroscopy
  87. GRB 061007: Correction to GCN 5712
  88. GRB 061007: Swift-BAT refined analysis
  89. GRB 061007: Swift XRT refined analysis
  90. GRB 061006: Swift/UVOT optical observations
  91. Konus-Wind observation of the short hard GRB 061006
  92. GRB 061007 - FTS early brightening and power law decay
  93. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  94. GRB 061007: ROTSE-III Detection of Optical Counterpart
  95. GRB 061006: VLT observation
  96. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  97. GRB 061006: Swift-XRT Team Refined Analysis
  98. GRB061006 (Swift 232585) might be a short-hard GRB
  99. GRB061006: Faulkes Telescope South Observations
  100. GRB 061004: Optical afterglow candidate and redshift

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