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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"

32552 results found.

  1. GRB 081007: Radio Detection
  2. Konus-Wind observation of GRB 081001
  3. GRB 081007: Rapid PROMPT Detections
  4. GRB 081008, Swift-BAT refined analysis
  5. GRB 081008: VLT redshift confirmation
  6. GRB 081008: Swift-XRT Refined Analysis
  7. GRB081008: Swift/UVOT observations
  8. GRB 081008: Gemini-South Absorption Redshiftt
  9. GRB 081008: VLT/FORS2 spectroscopy
  10. GRB 081008: ROTSE-III Detection of Optical Counterpart
  11. GRB081007: Swift/UVOT Observations
  12. GRB 081007, SMARTS optical afterglow observations
  13. GRB 081007, Swift-BAT refined analysis
  14. GRB 081007: Early RAPTOR measurements of optical counterpart
  15. GRB 081007: Swift-XRT Team refined analysis
  16. GRB 081007: Gemini-south redshift
  17. GRB 081007, Faulkes Telescope North optical observations
  18. GRB 081007, SMARTS optical/IR afterglow observations
  19. GRB 081007: REM NIR and optical counterpart
  20. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  21. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  22. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  23. GRB 081003B: Swift-XRT upper limit
  24. GRB 081003A: OSN optical observations
  25. GRB 081001: Further observations from OSN
  26. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  27. GRB 081003A: Swift-XRT Team position and analysis
  28. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  29. GRB 080928: Fermi GBM detection
  30. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  31. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  32. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  33. GRB 081001: Observations from OSN
  34. GRB 080925: Suzaku WAM observation of the prompt emission
  35. GRB 081001: Swift UVOT Observations
  36. GRB 081001: Swift-XRT position
  37. GRB081001: optical limit from ASH-Centurion
  38. GRB080928: redshift retraction
  39. GRB 080928: Watcher observations
  40. GRB 080928: VLT redshift
  41. GRB080928: Gemini-South Absorption Redshift
  42. GRB 080928: Swift-XRT refined analysis
  43. GRB 080928: Swift/UVOT observations
  44. GRB 080928, Swift-BAT final refined analysis
  45. GRB 080928: GROND DETECTION
  46. GRB 080928, Swift-BAT initial refined analysis
  47. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  48. GRB080922, optical upper limit
  49. Swift-BAT trigger 325707 is not a GRB
  50. Swift trigger 325707: Swift/UVOT Upper Limits
  51. Swift trigger 325707: Swift-XRT upper limit
  52. GRB080916A: Suzaku WAM observation of the prompt emission
  53. GRB 080922: Swift/UVOT Upper Limits
  54. GRB080922: Swift-XRT upper limit
  55. GRB 080916C: Fermi GBM Spectral Analysis
  56. GRB 080919: Swift/UVOT Refined Analysis
  57. GRB 080919: Swift-XRT refined analysis
  58. GRB 080919, Swift-BAT refined analysis
  59. GRB 080916C: IRSF/SIRUS NIR Observation
  60. GRB 080916C: GROND Confirmation of the Optical Afterglow
  61. GRB 080916C: GROND Confirmation of the Optical Afterglow
  62. GRB 080919: REM NIR observations
  63. GRB 080915A: GROND upper limits
  64. GRB080913: Swift-BAT spectral lag
  65. GRB 080916A: GROND lightcurve
  66. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  67. GRB 080916A: Rapid PROMPT Observations
  68. GRB 080916A: Fermi GBM detection
  69. GRB 080916C: Swift UVOT Refined Analysis
  70. GRB 080916C: Swift XRT refined analysis
  71. GRB 080916B: Swift-XRT refined analysis
  72. Konus-Wind observation of GRB 080916A
  73. Konus-Wind observation of GRB 080916C
  74. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  75. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  76. GRB080916A: Spectroscopic redshift
  77. GRB 080916C: Swift/XRT detection of possible afterglow
  78. GRB 080916B: Swift UVOT Refined Analysis
  79. IPN Triangulation and Energy Spectrum of GRB080916C
  80. GRB 080916B, Swift-BAT refined analysis
  81. GRB080916A: Refined Swift/UVOT Observations
  82. GRB 080915a, SMARTS optical/IR observations
  83. GRB 080916C: Fermi LAT observation
  84. GRB 080916A: Swift XRT refined analysis
  85. GRB 080916A, Swift-BAT refined analysis
  86. GRB 080916: REM detection of the NIR afterglow
  87. GRB 080916: REM candidate afterglow
  88. GRB 080915B, Swift-BAT refined analysis
  89. GRB 080915: REM NIR early observations
  90. GRB 080915: Swift/UVOT Upper Limits
  91. GRB 080915: Swift-XRT afterglow detection and analysis
  92. GRB 080915, Swift-BAT refined analysis
  93. SGR 0501+4516 : P200 i-band observations
  94. GRB 080915: ROTSE-III Optical Limits
  95. GRB 080913: Swift-XRT refined analysis
  96. GRB 080913: VLT/FORS spectrum
  97. GRB080913: Swift/UVOT Upper Limits
  98. GRB 080913: GROND photo-z
  99. GRB 080913, Swift-BAT refined analysis
  100. GRB 080913: VLT/FORS2 observations

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