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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"

28234 results found.

  1. IPN localization of GRB070124 (short duration, hard spectrum)
  2. GRB 070110: Ep,i - Eiso correlation
  3. GRB 070107: Suzaku WAM observation of the prompt emission
  4. GRB070110: Swift XRT Team refined analysis
  5. GRB 070110, Swift-BAT refined analysis
  6. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  7. GRB 070110: Swift detection of a burst with a possible optical afterglow
  8. GRB 070107: Possible UVOT Afterglow
  9. GRB 070107, Swift-BAT refined analysis
  10. GRB 070107: Swift detection of a burst
  11. VLA observation of GRB 061222B
  12. VLA detection of GRB 061222A
  13. GRB070103: APO SPIcam i' and z' limits
  14. GRB070103: KPNO 4m+FLAMINGOS J limit
  15. GRB 070103: Swift/UVOT Upper limits
  16. GRB070103: Swift XRT refined analysis
  17. GRB 070103, Swift-BAT refined analysis
  18. GRB 070103: NOT observations
  19. GRB 070103: TAROT Calern observatory optical observations
  20. Retractions of previous Swift-BAT triggers
  21. erratum : SDSS Pre-burst Observations of GRB061126
  22. GRB 061210: Swift/XRT Astrometry Correction
  23. GRB 050826: MDM Redshift
  24. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  25. GRB 061222A: Xinglong Optical Limit
  26. GRB 061222A: Gemini Afterglow Candidate
  27. GRB 061222B, Swift-BAT refined analysis
  28. GRB061222A Swift/UVOT: Upper Limits
  29. GRB 061222B: Swift/UVOT Upper limits
  30. GRB 061222B: Observation with the KANATA 1.5m telescope
  31. GRB 061222A: Observation with the KANATA 1.5m telescope
  32. GRB 061222B: BOOTES-IR optical observations
  33. GRB 061222B: SARA upper limit
  34. GRB 061217: Magellan host galaxy redshift
  35. GRB 061222A, Swift-BAT refined analysis
  36. GRB 061222B: REM NIR/optical observations
  37. GRB 061222B: TAROT La Silla observatory optical observations
  38. GRB 061222B: Swift detection of a burst
  39. GRB 061222b: optical afterglow
  40. GRB 061222A: Prompt ROTSE-III Optical Limits
  41. GRB 061222: Swift detection of a burst
  42. GRB 061218: TAROT La Silla observatory optical observations
  43. GRB 061217: TAROT Calern observatory optical observations
  44. GRB 061218: TORTOREM optical upper limits
  45. GRB 061218, Swift-BAT refined analysis
  46. GRB061217: VLT NIR observations
  47. GRB 061218, SMARTS optical/IR observations
  48. GRB 061218: REM prompt observations
  49. Swift triggers (#251863) on a possible burst
  50. GRB061217: Swift/UVOT refined analysis.
  51. GRB 061217: optical observations at Calar Alto
  52. GRB061217 - Swift/XRT refined analysis
  53. GRB 061217, Swift-BAT refined analysis
  54. GRB 061217: Magellan Observations
  55. GRB 061217: REM prompt observations
  56. GRB 061217: ROTSE-III Optical Limits
  57. GRB061210: Swift/UVOT observations
  58. GRB 061210: Swift XRT analysis - Possible counterparts
  59. GRB 061210: Gemini/GMOS Observations
  60. GRB 061126: Radio Observations
  61. GRB061210: Radio Observations
  62. GRB 061202: Suzaku WAM observation of the prompt emission
  63. GRB 061210, Swift-BAT refined analysis of the SHB
  64. Optical Afterglow observations of GRB 061126
  65. GRB 060926: MASTER: discovery of the optical flare
  66. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  67. GRB 061202: TORTOREM optical upper limits
  68. GRB 061201: VLT optical decay
  69. GRB 061201: SOAR Confirmation of Candidate Afterglow
  70. GRB061202: FRAM early follow-up limit
  71. GRB061202 optical limit by "Pi of the Sky"
  72. GRB061202: optical/NIR observations with REM
  73. GRB061202: Swift/UVOT Upper Limits
  74. GRB 061202, Swift-BAT refined analysis
  75. GRB 061202: Swift detection of a burst
  76. GRB 061201: VLT optical observations
  77. GRB 061201: Initial UVOT Observations
  78. GRB 061201, Swift-BAT refined analysis of the SHB
  79. GRB 061201: Swift detection of a short hard burst
  80. INT+WFC observations of GRB 061126
  81. Swift XRT on-board boresight update
  82. GRB 061126: optical observation
  83. GRB 061126: Tautenburg afterglow observations
  84. GRB061126: Optical afterglow observations from MIRO
  85. GRB061126: Optical afterglow observations from MIRO
  86. GRB 061126 : SDSS Pre-Burst Observations
  87. GRB 061126: Swift-XRT refined analysis
  88. GRB 061126: Swift/UVOT Observations
  89. GRB 061126, Swift-BAT refined analysis
  90. GRB 061126: Early Detection of the IR Afterglow
  91. GRB 061126: Swift/UVOT Afterglow Detection
  92. GRB 061122: Candidate Optical Afterglow
  93. GRB 061121: Ep,i - Eiso correlation
  94. GRB061122: Swift/UVOT Optical Observations
  95. GRB061121: P60 Observations
  96. Radio detection of GRB 061121
  97. GRB061122: Swift-XRT position
  98. INTEGRAL results on GRB 061122
  99. Swift-BAT trigger 239987 is not a GRB
  100. GRB 061121: Swift/UVOT Observations

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