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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"

32770 results found.

  1. GRB 081016: Swift-XRT candidate afterglow detection
  2. Detection of flare star Algol in Swift-BAT slew data
  3. GRB 081012: GROND upper limits
  4. GRB 081008: Galaxy associated with z=1.967 absorber
  5. GRB 081012: Fermi GBM detection
  6. GRB 081007 and GRB 081007B: Fermi GBM detection
  7. GRB 080430: optical observations
  8. GRB 081008 optical upper limit
  9. GRB 081012: Observations from NOT
  10. GRB 081012: Swift/UVOT analysis of initial observations
  11. GRB 081012: Swift/XRT detection
  12. GRB 081012, Swift-BAT refined analysis
  13. GRB 081012: ROTSE-III Optical Limits
  14. Revised table for GRB 081011 UVOT detections
  15. GRB081011: UVOT detection of an optical afterglow
  16. GRB 081011: Swift/XRT detection
  17. GRB 081011, Swift-BAT refined analysis
  18. GRB 081008, SMARTS optical/IR afterglow observations
  19. GRB 081007: Radio Detection
  20. Konus-Wind observation of GRB 081001
  21. GRB 081007: Rapid PROMPT Detections
  22. GRB 081008, Swift-BAT refined analysis
  23. GRB 081008: VLT redshift confirmation
  24. GRB 081008: Swift-XRT Refined Analysis
  25. GRB081008: Swift/UVOT observations
  26. GRB 081008: Gemini-South Absorption Redshiftt
  27. GRB 081008: VLT/FORS2 spectroscopy
  28. GRB 081008: ROTSE-III Detection of Optical Counterpart
  29. GRB081007: Swift/UVOT Observations
  30. GRB 081007, SMARTS optical afterglow observations
  31. GRB 081007, Swift-BAT refined analysis
  32. GRB 081007: Early RAPTOR measurements of optical counterpart
  33. GRB 081007: Swift-XRT Team refined analysis
  34. GRB 081007: Gemini-south redshift
  35. GRB 081007, Faulkes Telescope North optical observations
  36. GRB 081007, SMARTS optical/IR afterglow observations
  37. GRB 081007: REM NIR and optical counterpart
  38. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  39. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  40. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  41. GRB 081003B: Swift-XRT upper limit
  42. GRB 081003A: OSN optical observations
  43. GRB 081001: Further observations from OSN
  44. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  45. GRB 081003A: Swift-XRT Team position and analysis
  46. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  47. GRB 080928: Fermi GBM detection
  48. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  49. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  50. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  51. GRB 081001: Observations from OSN
  52. GRB 080925: Suzaku WAM observation of the prompt emission
  53. GRB 081001: Swift UVOT Observations
  54. GRB 081001: Swift-XRT position
  55. GRB081001: optical limit from ASH-Centurion
  56. GRB080928: redshift retraction
  57. GRB 080928: Watcher observations
  58. GRB 080928: VLT redshift
  59. GRB080928: Gemini-South Absorption Redshift
  60. GRB 080928: Swift-XRT refined analysis
  61. GRB 080928: Swift/UVOT observations
  62. GRB 080928, Swift-BAT final refined analysis
  63. GRB 080928: GROND DETECTION
  64. GRB 080928, Swift-BAT initial refined analysis
  65. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  66. GRB080922, optical upper limit
  67. Swift-BAT trigger 325707 is not a GRB
  68. Swift trigger 325707: Swift/UVOT Upper Limits
  69. Swift trigger 325707: Swift-XRT upper limit
  70. GRB080916A: Suzaku WAM observation of the prompt emission
  71. GRB 080922: Swift/UVOT Upper Limits
  72. GRB080922: Swift-XRT upper limit
  73. GRB 080916C: Fermi GBM Spectral Analysis
  74. GRB 080919: Swift/UVOT Refined Analysis
  75. GRB 080919: Swift-XRT refined analysis
  76. GRB 080919, Swift-BAT refined analysis
  77. GRB 080916C: IRSF/SIRUS NIR Observation
  78. GRB 080916C: GROND Confirmation of the Optical Afterglow
  79. GRB 080916C: GROND Confirmation of the Optical Afterglow
  80. GRB 080919: REM NIR observations
  81. GRB 080915A: GROND upper limits
  82. GRB080913: Swift-BAT spectral lag
  83. GRB 080916A: GROND lightcurve
  84. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  85. GRB 080916A: Rapid PROMPT Observations
  86. GRB 080916A: Fermi GBM detection
  87. GRB 080916C: Swift UVOT Refined Analysis
  88. GRB 080916C: Swift XRT refined analysis
  89. GRB 080916B: Swift-XRT refined analysis
  90. Konus-Wind observation of GRB 080916A
  91. Konus-Wind observation of GRB 080916C
  92. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  93. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  94. GRB080916A: Spectroscopic redshift
  95. GRB 080916C: Swift/XRT detection of possible afterglow
  96. GRB 080916B: Swift UVOT Refined Analysis
  97. IPN Triangulation and Energy Spectrum of GRB080916C
  98. GRB 080916B, Swift-BAT refined analysis
  99. GRB080916A: Refined Swift/UVOT Observations
  100. GRB 080915a, SMARTS optical/IR observations

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