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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"

28130 results found.

  1. GRB 070110, Swift-BAT refined analysis
  2. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  3. GRB 070110: Swift detection of a burst with a possible optical afterglow
  4. GRB 070107: Possible UVOT Afterglow
  5. GRB 070107, Swift-BAT refined analysis
  6. GRB 070107: Swift detection of a burst
  7. VLA observation of GRB 061222B
  8. VLA detection of GRB 061222A
  9. GRB070103: APO SPIcam i' and z' limits
  10. GRB070103: KPNO 4m+FLAMINGOS J limit
  11. GRB 070103: Swift/UVOT Upper limits
  12. GRB070103: Swift XRT refined analysis
  13. GRB 070103, Swift-BAT refined analysis
  14. GRB 070103: NOT observations
  15. GRB 070103: TAROT Calern observatory optical observations
  16. Retractions of previous Swift-BAT triggers
  17. erratum : SDSS Pre-burst Observations of GRB061126
  18. GRB 061210: Swift/XRT Astrometry Correction
  19. GRB 050826: MDM Redshift
  20. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  21. GRB 061222A: Xinglong Optical Limit
  22. GRB 061222A: Gemini Afterglow Candidate
  23. GRB 061222B, Swift-BAT refined analysis
  24. GRB061222A Swift/UVOT: Upper Limits
  25. GRB 061222B: Swift/UVOT Upper limits
  26. GRB 061222B: Observation with the KANATA 1.5m telescope
  27. GRB 061222A: Observation with the KANATA 1.5m telescope
  28. GRB 061222B: BOOTES-IR optical observations
  29. GRB 061222B: SARA upper limit
  30. GRB 061217: Magellan host galaxy redshift
  31. GRB 061222A, Swift-BAT refined analysis
  32. GRB 061222B: REM NIR/optical observations
  33. GRB 061222B: TAROT La Silla observatory optical observations
  34. GRB 061222B: Swift detection of a burst
  35. GRB 061222b: optical afterglow
  36. GRB 061222A: Prompt ROTSE-III Optical Limits
  37. GRB 061222: Swift detection of a burst
  38. GRB 061218: TAROT La Silla observatory optical observations
  39. GRB 061217: TAROT Calern observatory optical observations
  40. GRB 061218: TORTOREM optical upper limits
  41. GRB 061218, Swift-BAT refined analysis
  42. GRB061217: VLT NIR observations
  43. GRB 061218, SMARTS optical/IR observations
  44. GRB 061218: REM prompt observations
  45. Swift triggers (#251863) on a possible burst
  46. GRB061217: Swift/UVOT refined analysis.
  47. GRB 061217: optical observations at Calar Alto
  48. GRB061217 - Swift/XRT refined analysis
  49. GRB 061217, Swift-BAT refined analysis
  50. GRB 061217: Magellan Observations
  51. GRB 061217: REM prompt observations
  52. GRB 061217: ROTSE-III Optical Limits
  53. GRB061210: Swift/UVOT observations
  54. GRB 061210: Swift XRT analysis - Possible counterparts
  55. GRB 061210: Gemini/GMOS Observations
  56. GRB 061126: Radio Observations
  57. GRB061210: Radio Observations
  58. GRB 061202: Suzaku WAM observation of the prompt emission
  59. GRB 061210, Swift-BAT refined analysis of the SHB
  60. Optical Afterglow observations of GRB 061126
  61. GRB 060926: MASTER: discovery of the optical flare
  62. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  63. GRB 061202: TORTOREM optical upper limits
  64. GRB 061201: VLT optical decay
  65. GRB 061201: SOAR Confirmation of Candidate Afterglow
  66. GRB061202: FRAM early follow-up limit
  67. GRB061202 optical limit by "Pi of the Sky"
  68. GRB061202: optical/NIR observations with REM
  69. GRB061202: Swift/UVOT Upper Limits
  70. GRB 061202, Swift-BAT refined analysis
  71. GRB 061202: Swift detection of a burst
  72. GRB 061201: VLT optical observations
  73. GRB 061201: Initial UVOT Observations
  74. GRB 061201, Swift-BAT refined analysis of the SHB
  75. GRB 061201: Swift detection of a short hard burst
  76. INT+WFC observations of GRB 061126
  77. Swift XRT on-board boresight update
  78. GRB 061126: optical observation
  79. GRB 061126: Tautenburg afterglow observations
  80. GRB061126: Optical afterglow observations from MIRO
  81. GRB061126: Optical afterglow observations from MIRO
  82. GRB 061126 : SDSS Pre-Burst Observations
  83. GRB 061126: Swift-XRT refined analysis
  84. GRB 061126: Swift/UVOT Observations
  85. GRB 061126, Swift-BAT refined analysis
  86. GRB 061126: Early Detection of the IR Afterglow
  87. GRB 061126: Swift/UVOT Afterglow Detection
  88. GRB 061122: Candidate Optical Afterglow
  89. GRB 061121: Ep,i - Eiso correlation
  90. GRB061122: Swift/UVOT Optical Observations
  91. GRB061121: P60 Observations
  92. Radio detection of GRB 061121
  93. GRB061122: Swift-XRT position
  94. INTEGRAL results on GRB 061122
  95. Swift-BAT trigger 239987 is not a GRB
  96. GRB 061121: Swift/UVOT Observations
  97. GRB 061121: Swift-XRT Team Refined Analysis
  98. GRB 061121, Swift-BAT refined analysis
  99. GRB061121, optical observation
  100. GRB 061121: Optical observation at the KANATA 1.5m telescope

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