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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"

32725 results found.

  1. Corrections for Swift/UVOT Exposure Times for GRBs 061110B and 061121
  2. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  3. GRB 061202: TORTOREM optical upper limits
  4. GRB 061201: VLT optical decay
  5. GRB 061201: SOAR Confirmation of Candidate Afterglow
  6. GRB061126 : NMSU 1.0m observations
  7. GRB 061202: Swift XRT refined analysis
  8. GRB061202: FRAM early follow-up limit
  9. Konus-Wind observation of GRB 061201
  10. GRB061202: optical/NIR observations with REM
  11. GRB061202: Swift/UVOT Upper Limits
  12. GRB 061202, Swift-BAT refined analysis
  13. GRB 061201: Swift XRT Team refined analysis
  14. GRB 061201: VLT optical observations
  15. GRB 061201: Initial UVOT Observations
  16. GRB 061201, Swift-BAT refined analysis of the SHB
  17. GRB 061122: GETS observation
  18. GRB 061121, SMARTS optical/IR observations
  19. GRB 061121: flattening of the decay
  20. INT+WFC observations of GRB 061126
  21. GRB 061126: Possible Jet Break
  22. GRB 061121: Second Epoch ATCA Radio Observations
  23. GRB 061126: RAPTOR Optical Detection During Gamma-Ray Emission
  24. Swift XRT on-board boresight update
  25. GRB 061121: ATCA & WSRT Radio Observations
  26. GRB061121: optical observations
  27. GRB 061126: Early Super-LOTIS Observations
  28. GRB 061126: optical observation
  29. RHESSI Spectrum of GRB061126
  30. GRB 061126: Tautenburg afterglow observations
  31. GRB061126: Optical afterglow observations from MIRO
  32. GRB061126: Optical afterglow observations from MIRO
  33. GRB 061126 : SDSS Pre-Burst Observations
  34. GRB 061126: Swift-XRT refined analysis
  35. GRB 061126: Swift/UVOT Observations
  36. GRB 061126, Swift-BAT refined analysis
  37. GRB 061126: SARA Observations
  38. GRB 061126: Early Detection of the IR Afterglow
  39. GRB 061126: Faulkes Telescope North Optical Observations
  40. GRB 061121: MDM Continued Monitoring
  41. GRB 061122: Confirmation of X-ray/Optical Afterglow
  42. GRB 061121: MDM Continuing Optical Decay
  43. GRB061121: optical observations
  44. GRB 061122: Candidate Optical Afterglow
  45. GRB 061121: Ep,i - Eiso correlation
  46. GRB 061121: MDM Optical Decay
  47. GRB061122: Swift/UVOT Optical Observations
  48. GRB 061121: ART detection in Ic
  49. GRB061121: P60 Observations
  50. Radio detection of GRB 061121
  51. GRB061122: Swift-XRT position
  52. Konus-Wind observation of GRB 061122
  53. GRB 061121: MDM Optical Observations
  54. GRB 061121 declared "Burst of Interest" by Swift team
  55. RHESSI Spectrum of GRB061121
  56. Konus-Wind and Konus-A observations of GRB 061121
  57. INTEGRAL results on GRB 061122
  58. GRB 061121: Swift/UVOT Observations
  59. GRB 061121: Swift-XRT Team Refined Analysis
  60. GRB 061121, Swift-BAT refined analysis
  61. GRB061121, optical observation
  62. GRB 061121: Optical observation at the KANATA 1.5m telescope
  63. GRB 061121: Faulkes Telescope North Optical Observation
  64. GRB061121: Spectroscopic Redshift
  65. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  66. GRB 060605: NIR Observations
  67. GRB 050915B: optical afterglow
  68. GRB 060111B: Swift UVOT Refined Magnitudes
  69. GRB061110A: Correction to GCN5817
  70. GRB 061110A: refined R-band analysis
  71. GRB 061110B: NIR Observations
  72. Swift/UVOT Upper Limits for GRB061110b
  73. Swift/UVOT Upper Limits for GRB061110a
  74. GRB 061110B: Swift XRT refined analysis
  75. GRB 061110B, Swift-BAT refined analysis
  76. GRB 061110B: VLT redshift
  77. GRB 061110B: NOT optical observations
  78. GRB 061110A: Swift XRT refined analysis
  79. GRB 061110B: Swift/XRT position
  80. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  81. GRB 061110A, Swift-BAT refined analysis
  82. GRB 061110: ROTSE-III Optical Limits
  83. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  84. GRB 061109: optical observation
  85. GRB061028: MAGIC telescope GeV observation
  86. GRB 061007: Third Epoch ATCA Radio Observations
  87. GRB061019: second epoch CrAO observations
  88. GRB 061028: Swift/XRT Astrometry Correction
  89. GRB 061102: Swift/UVOT Magnitude Upper Limits
  90. GRB 061102, XRT refined analysis
  91. GRB 061004: Further VLT/NTT observations
  92. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  93. GRB061102B: Super-LOTIS observations
  94. GRB 061028: Optical R passband observations
  95. GRB 061102, Swift-BAT refined analysis
  96. GRB 061028: VLA Observation
  97. GRB 061004: Swift/XRT Astrometry Correction
  98. GRB 060801: Swift/XRT Astrometry Correction
  99. GRB 061028: Futher P200 Observations
  100. GRB 061028: MDM Observations

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