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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"

42304 results found.

  1. GRB 061126 : SDSS Pre-Burst Observations
  2. GRB 061126: Swift-XRT refined analysis
  3. GRB 061126: Swift/UVOT Observations
  4. GRB 061126, Swift-BAT refined analysis
  5. GRB 061126: SARA Observations
  6. GRB 061126: Early Detection of the IR Afterglow
  7. GRB 061126: Faulkes Telescope North Optical Observations
  8. GRB 061126: Swift/UVOT Afterglow Detection
  9. GRB 061126: XRT position
  10. GRB 061126: Swift detection of a burst
  11. GRB 061122: Confirmation of X-ray/Optical Afterglow
  12. GRB 061121: MDM Continuing Optical Decay
  13. GRB061121: optical observations
  14. GRB 061122: Candidate Optical Afterglow
  15. GRB 061121: Ep,i - Eiso correlation
  16. GRB 061121: MDM Optical Decay
  17. GRB061122: Swift/UVOT Optical Observations
  18. GRB 061121: ART detection in Ic
  19. GRB061121: P60 Observations
  20. GRB061122: Swift-XRT position
  21. Konus-Wind observation of GRB 061122
  22. GRB 061121: MDM Optical Observations
  23. GRB 061121 declared "Burst of Interest" by Swift team
  24. RHESSI Spectrum of GRB061121
  25. Konus-Wind and Konus-A observations of GRB 061121
  26. GRB 061122A: a long GRB detected by INTEGRAL
  27. GRB 061121: Swift/UVOT Observations
  28. GRB 061121: Swift-XRT Team Refined Analysis
  29. GRB 061121, Swift-BAT refined analysis
  30. GRB061121, optical observation
  31. GRB 061121 : Planned XMM-Newton observation
  32. GRB 061121: Optical observation at the KANATA 1.5m telescope
  33. GRB 061121: Faulkes Telescope North Optical Observation
  34. GRB061121: Spectroscopic Redshift
  35. GRB061121: Keck spectroscopic observations
  36. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  37. GRB 061121: Swift detection of a bright burst with an optical counterpart
  38. GRB 060605: NIR Observations
  39. GRB 050915B: optical afterglow
  40. GRB 060111B: Swift UVOT Refined Magnitudes
  41. GRB061110A: Correction to GCN5817
  42. GRB 061110A: refined R-band analysis
  43. GRB 061110B: NIR Observations
  44. Swift TOO observations of GRB061110A
  45. Swift/UVOT Upper Limits for GRB061110b
  46. Swift/UVOT Upper Limits for GRB061110a
  47. GRB 061110A - VLT tentative redshift
  48. GRB 061110B: Swift XRT refined analysis
  49. GRB 061110B: VLT redshift
  50. GRB061110B: Optical observations at Crni Vrh
  51. GRB 061110B: NOT optical observations
  52. GRB 061110A: Swift XRT refined analysis
  53. GRB 061110B: Swift/XRT position
  54. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  55. GRB 061110B: Swift-UVOT Initial Observation
  56. GRB 061110B: TAROT Calern observatory optical observations
  57. GRB 061110B: Swift detection of a burst
  58. GRB 061110: NOT observations
  59. GRB 061110: Candidate confirmed
  60. GRB 061110 : Optical afterglow candidate
  61. GRB 061110: ROTSE-III Optical Limits
  62. GRB 061110: Swift detection of a burst
  63. GRB061110A - Optical Non-detection
  64. GRB 061109: optical observation
  65. GRB 061109: TAROT Calern observatory optical observations
  66. GRB 061109: Swift detection of a possible burst
  67. GRB 061027: TAROT La Silla observatory optical observations
  68. GRB 061007: Third Epoch ATCA Radio Observations
  69. GRB061019: second epoch CrAO observations
  70. GRB 061028: Swift/XRT Astrometry Correction
  71. GRB 061102: Swift/UVOT Magnitude Upper Limits
  72. GRB 061102, XRT refined analysis
  73. GRB 061004: Further VLT/NTT observations
  74. GRB061102B: Super-LOTIS observations
  75. GRB 061028: Optical R passband observations
  76. GRB 061102B: Swift detection of a possible burst
  77. GRB 061102: Swift detection of a burst
  78. GRB 061028: VLA Observation
  79. GRB 061004: Swift/XRT Astrometry Correction
  80. GRB 060801: Swift/XRT Astrometry Correction
  81. GRB 061028: Futher P200 Observations
  82. GRB 061028: MDM Observations
  83. GRB 061028: P200 Observations
  84. GRB 061028: SARA upper limit
  85. GRB 061028: z band imaging
  86. GRB061028: XRT refined analysis
  87. GRB 061028: TAROT Calern observatory late optical observations
  88. GRB 061028: TAROT Calern observatory optical observations
  89. GRB 061028: Swift detection of a burst
  90. GRB 061027, Swift refined analysis of a possible burst
  91. GRB 061027: Swift detection of a possible burst
  92. GRB061025: ROTSE-III Confirmation of Optical Counterpart
  93. GRB061025: Swift XRT refined analysis
  94. GRB 061019: MITSuME upper limits
  95. GRB 061025: REM observations
  96. GRB 061025: Gemini-S observations
  97. GRB061025: Swift XRT position
  98. GRB 061025: ROTSE-III Optical Limits
  99. GRB 061025: a long GRB detected by INTEGRAL
  100. Swift XRT boresight update

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