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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"

28228 results found.

  1. GRB 070110: Swift detection of a burst with a possible optical afterglow
  2. GRB 070107: Possible UVOT Afterglow
  3. GRB 070107, Swift-BAT refined analysis
  4. GRB 070107: Swift detection of a burst
  5. VLA observation of GRB 061222B
  6. VLA detection of GRB 061222A
  7. GRB070103: APO SPIcam i' and z' limits
  8. GRB070103: KPNO 4m+FLAMINGOS J limit
  9. GRB 070103: Swift/UVOT Upper limits
  10. GRB070103: Swift XRT refined analysis
  11. GRB 070103, Swift-BAT refined analysis
  12. GRB 070103: NOT observations
  13. GRB 070103: TAROT Calern observatory optical observations
  14. Retractions of previous Swift-BAT triggers
  15. erratum : SDSS Pre-burst Observations of GRB061126
  16. GRB 061210: Swift/XRT Astrometry Correction
  17. GRB 050826: MDM Redshift
  18. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  19. GRB 061222A: Xinglong Optical Limit
  20. GRB 061222A: Gemini Afterglow Candidate
  21. GRB 061222B, Swift-BAT refined analysis
  22. GRB061222A Swift/UVOT: Upper Limits
  23. GRB 061222B: Swift/UVOT Upper limits
  24. GRB 061222B: Observation with the KANATA 1.5m telescope
  25. GRB 061222A: Observation with the KANATA 1.5m telescope
  26. GRB 061222B: BOOTES-IR optical observations
  27. GRB 061222B: SARA upper limit
  28. GRB 061217: Magellan host galaxy redshift
  29. GRB 061222A, Swift-BAT refined analysis
  30. GRB 061222B: REM NIR/optical observations
  31. GRB 061222B: TAROT La Silla observatory optical observations
  32. GRB 061222B: Swift detection of a burst
  33. GRB 061222b: optical afterglow
  34. GRB 061222A: Prompt ROTSE-III Optical Limits
  35. GRB 061222: Swift detection of a burst
  36. GRB 061218: TAROT La Silla observatory optical observations
  37. GRB 061217: TAROT Calern observatory optical observations
  38. GRB 061218: TORTOREM optical upper limits
  39. GRB 061218, Swift-BAT refined analysis
  40. GRB061217: VLT NIR observations
  41. GRB 061218, SMARTS optical/IR observations
  42. GRB 061218: REM prompt observations
  43. Swift triggers (#251863) on a possible burst
  44. GRB061217: Swift/UVOT refined analysis.
  45. GRB 061217: optical observations at Calar Alto
  46. GRB061217 - Swift/XRT refined analysis
  47. GRB 061217, Swift-BAT refined analysis
  48. GRB 061217: Magellan Observations
  49. GRB 061217: REM prompt observations
  50. GRB 061217: ROTSE-III Optical Limits
  51. GRB061210: Swift/UVOT observations
  52. GRB 061210: Swift XRT analysis - Possible counterparts
  53. GRB 061210: Gemini/GMOS Observations
  54. GRB 061126: Radio Observations
  55. GRB061210: Radio Observations
  56. GRB 061202: Suzaku WAM observation of the prompt emission
  57. GRB 061210, Swift-BAT refined analysis of the SHB
  58. Optical Afterglow observations of GRB 061126
  59. GRB 060926: MASTER: discovery of the optical flare
  60. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  61. GRB 061202: TORTOREM optical upper limits
  62. GRB 061201: VLT optical decay
  63. GRB 061201: SOAR Confirmation of Candidate Afterglow
  64. GRB061202: FRAM early follow-up limit
  65. GRB061202 optical limit by "Pi of the Sky"
  66. GRB061202: optical/NIR observations with REM
  67. GRB061202: Swift/UVOT Upper Limits
  68. GRB 061202, Swift-BAT refined analysis
  69. GRB 061202: Swift detection of a burst
  70. GRB 061201: VLT optical observations
  71. GRB 061201: Initial UVOT Observations
  72. GRB 061201, Swift-BAT refined analysis of the SHB
  73. GRB 061201: Swift detection of a short hard burst
  74. INT+WFC observations of GRB 061126
  75. Swift XRT on-board boresight update
  76. GRB 061126: optical observation
  77. GRB 061126: Tautenburg afterglow observations
  78. GRB061126: Optical afterglow observations from MIRO
  79. GRB061126: Optical afterglow observations from MIRO
  80. GRB 061126 : SDSS Pre-Burst Observations
  81. GRB 061126: Swift-XRT refined analysis
  82. GRB 061126: Swift/UVOT Observations
  83. GRB 061126, Swift-BAT refined analysis
  84. GRB 061126: Early Detection of the IR Afterglow
  85. GRB 061126: Swift/UVOT Afterglow Detection
  86. GRB 061122: Candidate Optical Afterglow
  87. GRB 061121: Ep,i - Eiso correlation
  88. GRB061122: Swift/UVOT Optical Observations
  89. GRB061121: P60 Observations
  90. Radio detection of GRB 061121
  91. GRB061122: Swift-XRT position
  92. INTEGRAL results on GRB 061122
  93. Swift-BAT trigger 239987 is not a GRB
  94. GRB 061121: Swift/UVOT Observations
  95. GRB 061121: Swift-XRT Team Refined Analysis
  96. GRB 061121, Swift-BAT refined analysis
  97. GRB061121, optical observation
  98. GRB 061121: Optical observation at the KANATA 1.5m telescope
  99. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  100. GRB 061121: Swift detection of a bright burst with an optical counterpart

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