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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"

32762 results found.

  1. GRB 081012: Observations from NOT
  2. GRB 081012: Swift/UVOT analysis of initial observations
  3. GRB 081012: Swift/XRT detection
  4. GRB 081012, Swift-BAT refined analysis
  5. GRB 081012: ROTSE-III Optical Limits
  6. Revised table for GRB 081011 UVOT detections
  7. GRB081011: UVOT detection of an optical afterglow
  8. GRB 081011: Swift/XRT detection
  9. GRB 081011, Swift-BAT refined analysis
  10. GRB 081008, SMARTS optical/IR afterglow observations
  11. GRB 081007: Radio Detection
  12. Konus-Wind observation of GRB 081001
  13. GRB 081007: Rapid PROMPT Detections
  14. GRB 081008, Swift-BAT refined analysis
  15. GRB 081008: VLT redshift confirmation
  16. GRB 081008: Swift-XRT Refined Analysis
  17. GRB081008: Swift/UVOT observations
  18. GRB 081008: Gemini-South Absorption Redshiftt
  19. GRB 081008: VLT/FORS2 spectroscopy
  20. GRB 081008: ROTSE-III Detection of Optical Counterpart
  21. GRB081007: Swift/UVOT Observations
  22. GRB 081007, SMARTS optical afterglow observations
  23. GRB 081007, Swift-BAT refined analysis
  24. GRB 081007: Early RAPTOR measurements of optical counterpart
  25. GRB 081007: Swift-XRT Team refined analysis
  26. GRB 081007: Gemini-south redshift
  27. GRB 081007, Faulkes Telescope North optical observations
  28. GRB 081007, SMARTS optical/IR afterglow observations
  29. GRB 081007: REM NIR and optical counterpart
  30. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  31. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  32. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  33. GRB 081003B: Swift-XRT upper limit
  34. GRB 081003A: OSN optical observations
  35. GRB 081001: Further observations from OSN
  36. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  37. GRB 081003A: Swift-XRT Team position and analysis
  38. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  39. GRB 080928: Fermi GBM detection
  40. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  41. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  42. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  43. GRB 081001: Observations from OSN
  44. GRB 080925: Suzaku WAM observation of the prompt emission
  45. GRB 081001: Swift UVOT Observations
  46. GRB 081001: Swift-XRT position
  47. GRB081001: optical limit from ASH-Centurion
  48. GRB080928: redshift retraction
  49. GRB 080928: Watcher observations
  50. GRB 080928: VLT redshift
  51. GRB080928: Gemini-South Absorption Redshift
  52. GRB 080928: Swift-XRT refined analysis
  53. GRB 080928: Swift/UVOT observations
  54. GRB 080928, Swift-BAT final refined analysis
  55. GRB 080928: GROND DETECTION
  56. GRB 080928, Swift-BAT initial refined analysis
  57. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  58. GRB080922, optical upper limit
  59. Swift-BAT trigger 325707 is not a GRB
  60. Swift trigger 325707: Swift/UVOT Upper Limits
  61. Swift trigger 325707: Swift-XRT upper limit
  62. GRB080916A: Suzaku WAM observation of the prompt emission
  63. GRB 080922: Swift/UVOT Upper Limits
  64. GRB080922: Swift-XRT upper limit
  65. GRB 080916C: Fermi GBM Spectral Analysis
  66. GRB 080919: Swift/UVOT Refined Analysis
  67. GRB 080919: Swift-XRT refined analysis
  68. GRB 080919, Swift-BAT refined analysis
  69. GRB 080916C: IRSF/SIRUS NIR Observation
  70. GRB 080916C: GROND Confirmation of the Optical Afterglow
  71. GRB 080916C: GROND Confirmation of the Optical Afterglow
  72. GRB 080919: REM NIR observations
  73. GRB 080915A: GROND upper limits
  74. GRB080913: Swift-BAT spectral lag
  75. GRB 080916A: GROND lightcurve
  76. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  77. GRB 080916A: Rapid PROMPT Observations
  78. GRB 080916A: Fermi GBM detection
  79. GRB 080916C: Swift UVOT Refined Analysis
  80. GRB 080916C: Swift XRT refined analysis
  81. GRB 080916B: Swift-XRT refined analysis
  82. Konus-Wind observation of GRB 080916A
  83. Konus-Wind observation of GRB 080916C
  84. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  85. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  86. GRB080916A: Spectroscopic redshift
  87. GRB 080916C: Swift/XRT detection of possible afterglow
  88. GRB 080916B: Swift UVOT Refined Analysis
  89. IPN Triangulation and Energy Spectrum of GRB080916C
  90. GRB 080916B, Swift-BAT refined analysis
  91. GRB080916A: Refined Swift/UVOT Observations
  92. GRB 080915a, SMARTS optical/IR observations
  93. GRB 080916C: Fermi LAT observation
  94. GRB 080916A: Swift XRT refined analysis
  95. GRB 080916A, Swift-BAT refined analysis
  96. GRB 080916: REM detection of the NIR afterglow
  97. GRB 080916: REM candidate afterglow
  98. GRB 080915B, Swift-BAT refined analysis
  99. GRB 080915: REM NIR early observations
  100. GRB 080915: Swift/UVOT Upper Limits

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