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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"

27811 results found.

  1. GRB 061222B, Swift-BAT refined analysis
  2. GRB061222A Swift/UVOT: Upper Limits
  3. GRB 061222B: Swift/UVOT Upper limits
  4. GRB061222B: Swift-XRT Refined Analysis
  5. GRB 061222B: BOOTES-IR optical observations
  6. GRB 061222B: SARA upper limit
  7. GRB 061222A: Swift-XRT refined analysis
  8. GRB 061222A, Swift-BAT refined analysis
  9. GRB 061222B: TAROT La Silla observatory optical observations
  10. GRB 061222B: Swift detection of a burst
  11. GRB 061222A: Prompt ROTSE-III Optical Limits
  12. GRB 061222: Swift detection of a burst
  13. GRB 061217: Astrometry-Corrected XRT Position
  14. GRB 061217, Candidate host galaxy
  15. GRB 061217 - Swift/XRT position correction
  16. GRB 061218: TAROT La Silla observatory optical observations
  17. GRB 061217: TAROT Calern observatory optical observations
  18. GRB 061218, Swift-BAT refined analysis
  19. Swift triggers (#251863) on a possible burst
  20. GRB061217: Swift/UVOT refined analysis.
  21. GRB 061217: optical observations at Calar Alto
  22. GRB061217 - Swift/XRT refined analysis
  23. GRB 061217, Further Swift-BAT refined analysis of the short hard burst
  24. GRB 061217, Swift-BAT refined analysis
  25. GRB 061217: ROTSE-III Optical Limits
  26. GRB 061217: Swift detection of a short hard burst
  27. GRB 061210: MDM Follow-up Observation
  28. GRB061210: Swift/UVOT observations
  29. Swift-BAT Trigger 250908 is a Cosmic Ray Shower event
  30. GRB 061210: Swift XRT analysis - Possible counterparts
  31. GRB 061210 : Faulkes North Telescope optical limit
  32. GRB 061214(?): ROTSE-III Optical Limits
  33. GRB 061214(?): Swift detection of a possible burst
  34. Swift/BAT trigger #250033 is due to a known source during loss of
  35. GRB 061213: MASTER-VWF-Kislovodsk optical candidate
  36. GRB 061213: MASTER-VWF-Kislovodsk observations
  37. GRB 061210: MDM Observation
  38. GRB 061210, Swift-BAT refined analysis of the SHB
  39. GRB 061210: Swift-BAT detection of a short burst
  40. Optical Afterglow observations of GRB 061126
  41. GRB061126: update on the Swift-XRT afterglow light curve
  42. Corrections for Swift/UVOT Exposure Times for GRBs 061110B and 061121
  43. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  44. GRB061126 : NMSU 1.0m observations
  45. GRB 061202: Swift XRT refined analysis
  46. GRB061202: FRAM early follow-up limit
  47. GRB061202 optical limit by "Pi of the Sky"
  48. Konus-Wind observation of GRB 061201
  49. GRB061202: Swift/UVOT Upper Limits
  50. GRB 061202, Swift-BAT refined analysis
  51. GRB 061202: Swift detection of a burst
  52. GRB 061201: Swift XRT Team refined analysis
  53. GRB 061201: Initial UVOT Observations
  54. GRB 061201, Swift-BAT refined analysis of the SHB
  55. GRB 061201: Swift detection of a short hard burst
  56. GRB 061201: Coincidence with a Galaxy Cluster
  57. GRB 061126: RAPTOR Optical Detection During Gamma-Ray Emission
  58. Swift XRT on-board boresight update
  59. GRB 061121: ATCA & WSRT Radio Observations
  60. GRB 061126: Early Super-LOTIS Observations
  61. GRB061126: Optical afterglow observations from MIRO
  62. GRB061126: Optical afterglow observations from MIRO
  63. GRB 061126: Swift-XRT refined analysis
  64. GRB 061126: Swift/UVOT Observations
  65. GRB 061126, Swift-BAT refined analysis
  66. GRB 061126: Early Detection of the IR Afterglow
  67. GRB 061126: Faulkes Telescope North Optical Observations
  68. GRB 061126: Swift/UVOT Afterglow Detection
  69. GRB 061126: XRT position
  70. GRB 061126: Swift detection of a burst
  71. GRB 061122: Confirmation of X-ray/Optical Afterglow
  72. GRB 061122: Candidate Optical Afterglow
  73. GRB 061121: Ep,i - Eiso correlation
  74. GRB061122: Swift/UVOT Optical Observations
  75. GRB 061121: ART detection in Ic
  76. Radio detection of GRB 061121
  77. GRB061122: Swift-XRT position
  78. GRB 061121 declared "Burst of Interest" by Swift team
  79. Konus-Wind and Konus-A observations of GRB 061121
  80. Swift-BAT trigger 239987 is not a GRB
  81. GRB 061121: Swift/UVOT Observations
  82. GRB 061121: Swift-XRT Team Refined Analysis
  83. GRB 061121, Swift-BAT refined analysis
  84. GRB061121, optical observation
  85. GRB 061121: Faulkes Telescope North Optical Observation
  86. GRB061121: Spectroscopic Redshift
  87. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  88. GRB 061121: Swift detection of a bright burst with an optical counterpart
  89. GRB 060111B: Swift UVOT Refined Magnitudes
  90. Swift-BAT triggers 238544 and 238546 are not GRBs
  91. Swift TOO observations of GRB061110A
  92. Swift/UVOT Upper Limits for GRB061110b
  93. Swift/UVOT Upper Limits for GRB061110a
  94. GRB 061110A - VLT tentative redshift
  95. GRB 061110B: Swift XRT refined analysis
  96. GRB 061110B, Swift-BAT refined analysis
  97. GRB061110B: Optical observations at Crni Vrh
  98. GRB 061110A: Swift XRT refined analysis
  99. GRB 061110B: Swift/XRT position
  100. GRB 061110B : Liverpool Telescope Optical Afterglow Detection

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