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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"

32551 results found.

  1. Brightening of the Optical Counterpart of the Possible GRB 060218
  2. GRB 060218: MDM Observations
  3. GRB 060218: Pre-burst detection of a possible host galaxy
  4. GRB 060218A: ROTSE-III Possible Optical Flare
  5. GRB060218: Swift/XRT refined position of a possible burst
  6. Preliminary refined analysis of the Swift-BAT trigger 191157
  7. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  8. GRB 060211B: Swift/UVOT Upper Limits
  9. GRB060218 : SDSS pre-burst observations
  10. GRB 060218: Swift XRT Position
  11. GRB 060213: optical afterglow not confirmed
  12. Swift UVOT observations of GRB060213
  13. GRB 060211B: Skynet Observations
  14. GRB 060213: optical afterglow candidate
  15. GRB060213: Swift XRT observations and possible afterglow candidate
  16. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  17. GRB060213: MASTER final result
  18. GRB 060211b: WIRO NIR Observations
  19. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  20. Konus-Wind observation of bright hard GRB 060213
  21. GRB 060210: Radio Observations
  22. GRB 060211a: WIRO NIR Observations
  23. GRB060211B: REM optical and NIR observations
  24. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  25. GRB 060211A: Further refined analysis of the Swift burst
  26. GRB060121: optical observations
  27. GRB060110: optical observations
  28. GRB060105: optical observations
  29. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  30. GRB 060211b: P60 Observations
  31. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  32. GRB 060206: SOAR Detections
  33. GRB 050826: Optical Afterglow and Host Galaxy
  34. GRB 060210: Further refined analysis of the Swift-BAT burst
  35. GRB 060211B: Swift/BAT refined analysis
  36. GRB060210: Swift/UVOT Upper Limits
  37. GRB 060211B: Swift-XRT Team refined analysis
  38. GRB060211b: optical observation
  39. GRB060211B: Swift/XRT position
  40. GRB 060210: Optical Observations
  41. GRB 060211A: Swift XRT Team Refined Analysis
  42. GRB060211: Faulkes North observation
  43. GRB 060211: ROTSE-III Optical Limits
  44. GRB 060210: Refined analysis of the Swift-BAT burst
  45. GRB060210: Swift XRT Refined Analysis
  46. GRB060206, optical observations
  47. GRB060210: Optical Observations
  48. GRB060210: Gemini absorption spectroscopy
  49. GRB060210: Early Optical Observations
  50. GRB060210:Faulkes Telescope North Afterglow Confirmation
  51. GRB 060206: Swift/UVOT Observations
  52. GRB060209: RTT150 optical observations
  53. GRB 060209 : TAROT optical observation
  54. GRB 060206: near-infrared observations (JK' imaging)
  55. GRB 060206: WSRT Radio Observations
  56. GRB 060203: Swift/UVOT upper limits
  57. GRB 060206: TTT Observations
  58. GRB 060206: More PROMPT Detections
  59. GRB 060121 : WIDGET Pre-trigger limit
  60. GRB 060206: Tenagra II Observations
  61. GRB 060206: PROMPT Detections
  62. GRB060204a: Swift XRT Source is not GRB Afterglow
  63. GRB 060206: optical observations at Asiago
  64. Orphan GRB Afterglow candidate
  65. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  66. GRB 060206: Subaru/FOCAS optical spectroscopy
  67. GRB 060206: IR Detection of the Afterglow
  68. GRB 060206: Lick 3m Spectroscopy
  69. GRB 060204A: ROSAT Pointing
  70. GRB 060206: Super-LOTIS observations
  71. GRB060204A: Swift/UVOT observations
  72. GRB 060206: Swift-BAT refined analysis
  73. GRB060206: SDSS Pre-Burst Observations
  74. GRB060206: Swift XRT Refined Analysis
  75. GRB060206: Liverpool Telescope observation
  76. GRB 060206: Spectroscopic Redshift
  77. GRB060206: P60 Optical Observations
  78. GRB 060206: KAIT observations
  79. GRB060206: Swift XRT Position
  80. GRB060206: SARA Detection
  81. GRB 060206: RAPTOR observations of afterglow candidate variability.
  82. GRB 060206: High redshift burst
  83. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  84. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  85. GRB060206: Optical afterglow
  86. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  87. GRB060203: WHT Z-band observations
  88. BAT GRB 060204C is probably not a GRB
  89. GRB060204C: optical observation
  90. GRB 060204B: BVRi-band detections of optical afterglow
  91. GRB 060204A: Swift XRT upper limit
  92. GRB 060204A: FRAM optical observations
  93. GRB060204B: Swift/UVOT refined analysis
  94. GRB 060204C: optical observations
  95. Swift XRT Observation of GRB 060204C
  96. GRB 060204B: Swift-BAT refined analysis
  97. GRB 060204B: ART early limit
  98. GRB060204B: Swift XRT Team Refined Analysis
  99. GRB 060204C: OSN limits
  100. GRB 060204b: Keck/LRIS Afterglow Confirmation

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