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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"

19662 results found.

  1. Oddball GRB 060218, transient or GRB?
  2. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  3. Brightening of the Optical Counterpart of the Possible GRB 060218
  4. GRB 060218: MDM Observations
  5. GRB 060218A: ROTSE-III Possible Optical Flare
  6. GRB060218: Swift/XRT refined position of a possible burst
  7. Preliminary refined analysis of the Swift-BAT trigger 191157
  8. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  9. GRB 060211B: Swift/UVOT Upper Limits
  10. GRB 060218: Swift XRT Position
  11. GRB 060218: Swift-BAT detection of a possible burst
  12. GRB 060213: optical afterglow not confirmed
  13. Swift UVOT observations of GRB060213
  14. GRB060213: Swift XRT observations and possible afterglow candidate
  15. GRB 060211b: WIRO NIR Observations
  16. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  17. GRB 060213: IPN localization
  18. GRB 060211a: WIRO NIR Observations
  19. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  20. GRB 060211A: Further refined analysis of the Swift burst
  21. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  22. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  23. GRB 050826: Optical Afterglow and Host Galaxy
  24. GRB 060210: Further refined analysis of the Swift-BAT burst
  25. GRB 060211B: Swift/BAT refined analysis
  26. GRB060210: Swift/UVOT Upper Limits
  27. GRB 060211B: Swift-XRT Team refined analysis
  28. GRB060211B: Swift/XRT position
  29. GRB 060210: Optical Observations
  30. GRB 060211A: Swift XRT Team Refined Analysis
  31. GRB 060211B: Swift-BAT detection of a burst
  32. GRB060211: Faulkes North observation
  33. GRB 060211: Swift detection of a long burst
  34. GRB 060210: Refined analysis of the Swift-BAT burst
  35. GRB060210: Swift XRT Refined Analysis
  36. GRB060210: Early Optical Observations
  37. GRB060210:Faulkes Telescope North Afterglow Confirmation
  38. GRB 060210: candidate afterglow
  39. GRB 060210: Swift detection of a burst
  40. GRB060210: Optical afterglow
  41. GRB 060206: Swift/UVOT Observations
  42. Swift-BAT trigger 180931 is not a GRB
  43. GRB060209: RTT150 optical observations
  44. GRB 060209 : TAROT optical observation
  45. GRB 060209(?): Swift-BAT detection of a possible burst
  46. GRB 060206: WSRT Radio Observations
  47. GRB 060203: Swift/UVOT upper limits
  48. GRB060204a: Swift XRT Source is not GRB Afterglow
  49. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  50. GRB 060204A: ROSAT Pointing
  51. GRB060204A: Swift/UVOT observations
  52. GRB 060206: Swift-BAT refined analysis
  53. GRB060206: Swift XRT Refined Analysis
  54. GRB060206: Swift XRT Position
  55. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  56. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  57. GRB060206: Swift-BAT detection of a burst
  58. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  59. BAT GRB 060204C is probably not a GRB
  60. GRB 060204B: BVRi-band detections of optical afterglow
  61. GRB 060204A: Swift XRT upper limit
  62. GRB060204B: Swift/UVOT refined analysis
  63. Swift XRT Observation of GRB 060204C
  64. GRB 060204B: Swift-BAT refined analysis
  65. GRB060204B: Swift XRT Team Refined Analysis
  66. GRB 060204C: OSN limits
  67. GRB 060204C: Liverpool Telescopes optical limit
  68. GRB 060204C: ROTSE-III Optical Limits
  69. GRB 060204C: Swift-BAT detection of a burst
  70. GRB 060124: Radio Observations
  71. GRB060204B: Faulkes OT candidate
  72. GRB060204B, optical observation
  73. GRB060204B - SDSS pre-burst observations
  74. GRB 060203: Swift-BAT refined analysis
  75. GRB 060204B: Swift detection of a burst
  76. GRB 060203: RTT150 optical observations
  77. GRB060203: Swift XRT Team Refined Analysis
  78. GRB060203 - Swift UVOT observation
  79. Swift-BAT trigger is GRB 060203
  80. GRB060203: Observations with SARA
  81. GRB 060203: P60 Confirmation of Optical Afterglow
  82. Possible GRB 060203: candidate optical counterpart
  83. Swift BAT Trigger 180151: Swift XRT source detection
  84. Possible GRB 060203: optical observations at Asiago
  85. Swift-BAT trigger 180151 is unknown origin at this time
  86. GRB 060202: Refined analysis of the Swift-BAT burst
  87. GRB060202, optical observation
  88. GRB 060202: Swift/UVOT upper limits
  89. GRB 060202: Swift XRT Team Refined Analysis
  90. GRB060202: Faulkes North observation
  91. GRB 060202: Swift detection of a burst
  92. GRB 060130: Swift/XRT observation
  93. GRB 060123: VLA Radio Observations
  94. Possible GRB 051221B: MDM Correction
  95. GRB 060123: Swift refined analysis of an unusual GRB
  96. GRB060124, BVRcIc field calibration
  97. GRB060105: refined analysis of the Suzaku observation
  98. GRB 060124: HETE detection and spectrum of the main peak
  99. Konus-Wind observation of GRB 060124
  100. GRB060124: detailed XRT analysis

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