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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"

36346 results found.

  1. GRB 080928: Fermi GBM detection
  2. GRB 081003: A long GRB discovered by INTEGRAL
  3. GRB 081001: Observations from OSN
  4. GRB 080925: Suzaku WAM observation of the prompt emission
  5. GRB 081001: Swift UVOT Observations
  6. GRB 081001: Swift-XRT position
  7. GRB081001: optical limit from ASH-Centurion
  8. GRB081001: SuperAGILE Localization of a long GRB
  9. GRB080928: redshift retraction
  10. GRB 080928: Watcher observations
  11. GRB 080927: Fermi GBM detection
  12. GRB 080928: VLT redshift
  13. GRB080928: Gemini-South Absorption Redshift
  14. GRB 080928: Swift-XRT refined analysis
  15. GRB 080928: Swift/UVOT observations
  16. GRB 080928, Swift-BAT final refined analysis
  17. GRB 080928: GROND DETECTION
  18. GRB 080928: Enhanced Swift-XRT position
  19. GRB 080928, Swift-BAT initial refined analysis
  20. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  21. GRB 080928: Swift detection of a burst with an optical counterpart
  22. GRB 080925: Fermi GBM Detection
  23. GRB 080920: Fermi GBM detection
  24. Swift-BAT trigger 325707 is not a GRB
  25. Swift trigger 325707: Swift/UVOT Upper Limits
  26. Swift detection of a possible GRB (trigger 325707)
  27. GRB080916A: Suzaku WAM observation of the prompt emission
  28. GRB 080922: Swift/UVOT Upper Limits
  29. GRB080922: Swift-XRT upper limit
  30. GRB080922: A long GRB detected by INTEGRAL
  31. GRB 080913B: Fermi GBM detection
  32. GRB 080916C: Fermi GBM Spectral Analysis
  33. GRB 080919: Swift/UVOT Refined Analysis
  34. GRB 080919: Swift-XRT refined analysis
  35. GRB 080919, Swift-BAT refined analysis
  36. GRB 080916C: IRSF/SIRUS NIR Observation
  37. GRB 080916C: GROND Confirmation of the Optical Afterglow
  38. GRB 080916C: GROND Confirmation of the Optical Afterglow
  39. GRB 080919: REM NIR observations
  40. GRB 080919: Swift detection of a short burst
  41. GRB 080915A: GROND upper limits
  42. GRB 080916A: GROND lightcurve
  43. GRB 080916A: Rapid PROMPT Observations
  44. GRB 080916A: Fermi GBM detection
  45. GRB 080916C: Swift UVOT Refined Analysis
  46. GRB 080916C: Swift XRT refined analysis
  47. GRB 080916B: Swift-XRT refined analysis
  48. Konus-Wind observation of GRB 080916A
  49. Konus-Wind observation of GRB 080916C
  50. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  51. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  52. GRB 080916C: Enhanced XRT position
  53. GRB080916A: Spectroscopic redshift
  54. GRB 080916C: Swift/XRT detection of possible afterglow
  55. GRB 080916B: Swift UVOT Refined Analysis
  56. IPN Triangulation and Energy Spectrum of GRB080916C
  57. GRB 080916B, Swift-BAT refined analysis
  58. GRB080916A: Refined Swift/UVOT Observations
  59. GRB 080915a, SMARTS optical/IR observations
  60. GRB 080916B: Enhanced Swift-XRT position
  61. GRB 080916C: Fermi LAT observation
  62. GRB 080916C: Fermi GBM Detection
  63. GRB 080916A: Swift XRT refined analysis
  64. GRB 080916A, Swift-BAT refined analysis
  65. GRB 080916B: Swift-XRT afterglow detection
  66. GRB 080916A: Enhanced Swift-XRT position
  67. GRB 080916B: Swift detection of a burst
  68. GRB 080916: REM detection of the NIR afterglow
  69. GRB 080916: REM candidate afterglow
  70. GRB 080916: Swift detection of a burst with optical afterglow
  71. GRB 080915B, Swift-BAT refined analysis
  72. GRB 080912 : Fermi GBM detection
  73. GRB 080915B: Swift detection of a burst
  74. GRB 080915: REM NIR early observations
  75. GRB 080915: Swift/UVOT Upper Limits
  76. GRB 080915: Swift-XRT afterglow detection and analysis
  77. GRB 080915, Swift-BAT refined analysis
  78. GRB 080915: ROTSE-III Optical Limits
  79. GRB 080915: Swift detection of a burst
  80. GRB 080913: Swift-XRT refined analysis
  81. GRB 080913: VLT/FORS spectrum
  82. GRB080913: Swift/UVOT Upper Limits
  83. GRB 080913: GROND photo-z
  84. GRB 080913, Swift-BAT refined analysis
  85. GRB 080913: VLT/FORS2 observations
  86. GRB 080913: REM NIR early observations
  87. GRB 080913: Enhanced Swift-XRT position
  88. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  89. GRB 080913: Swift detection of a burst
  90. GRB 080906: Watcher observations
  91. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  92. GRB 080906B: Fermi GBM detection
  93. GRB 080905C: Fermi GBM detection
  94. GRB 080905B: Photometric Redshift for the 2MASS Galaxy
  95. GRB080905A: Swift/UVOT Upper Limits
  96. GRB 080905B: Watcher optical detection
  97. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  98. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  99. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  100. GRB 080905A: Enhanced Swift-XRT position

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