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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"

21821 results found.

  1. Swift detection of a possible GRB (trigger 325707)
  2. GRB080916A: Suzaku WAM observation of the prompt emission
  3. GRB 080922: Swift/UVOT Upper Limits
  4. Trigger 324561: IGR J08408-4503 detected by Swift
  5. GRB 080919: Swift-XRT refined analysis
  6. GRB 080916C: IRSF/SIRUS NIR Observation
  7. GRB 080916C: GROND Confirmation of the Optical Afterglow
  8. GRB 080916C: GROND Confirmation of the Optical Afterglow
  9. GRB 080919: REM NIR observations
  10. GRB 080919: Swift detection of a short burst
  11. GRB 080915A: GROND upper limits
  12. GRB 080916A: GROND lightcurve
  13. GRB 080916A: Rapid PROMPT Observations
  14. GRB 080916C: Swift UVOT Refined Analysis
  15. GRB 080916C: Swift XRT refined analysis
  16. Konus-Wind observation of GRB 080916C
  17. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  18. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  19. GRB080916A: Spectroscopic redshift
  20. GRB 080916C: Swift/XRT detection of possible afterglow
  21. GRB 080916B: Swift UVOT Refined Analysis
  22. IPN Triangulation and Energy Spectrum of GRB080916C
  23. GRB080916A: Refined Swift/UVOT Observations
  24. GRB 080915a, SMARTS optical/IR observations
  25. GRB 080916B: Enhanced Swift-XRT position
  26. GRB 080916C: Fermi LAT observation
  27. GRB 080916A: Swift XRT refined analysis
  28. GRB 080916B: Swift-XRT afterglow detection
  29. GRB 080916A: Enhanced Swift-XRT position
  30. GRB 080916: REM detection of the NIR afterglow
  31. GRB 080916: REM candidate afterglow
  32. GRB 080916: Swift detection of a burst with optical afterglow
  33. GRB 080915B: Swift detection of a burst
  34. GRB 080915: REM NIR early observations
  35. GRB 080915: Swift/UVOT Upper Limits
  36. GRB 080915, Swift-BAT refined analysis
  37. GRB 080915: ROTSE-III Optical Limits
  38. GRB 080913: Swift-XRT refined analysis
  39. GRB080913: Swift/UVOT Upper Limits
  40. GRB 080913: VLT/FORS2 observations
  41. GRB 080913: REM NIR early observations
  42. GRB 080913: Enhanced Swift-XRT position
  43. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  44. GRB 080913: Swift detection of a burst
  45. GRB 080906: Watcher observations
  46. GRB 080906B: Fermi GBM detection
  47. GRB 080905C: Fermi GBM detection
  48. Swift trigger 324362 (LS I +61 303 ?)
  49. GRB080905A: Swift/UVOT Upper Limits
  50. GRB 080905B: Watcher optical detection
  51. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  52. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  53. GRB 080905A: MITSuME Akeno optical upper limits
  54. GRB 080906: Refined Swift/UVOT Observations
  55. GRB 080906: Swift-XRT Refined Analysis
  56. GRB 080905A: optical afterglow
  57. GRB 080906: GROND observations of the optical/NIR afterglow
  58. GRB 080905B: Refined UVOT Analysis
  59. GRB 080905B: VLT redshift
  60. GRB 080905A: NOT and VLT observations
  61. GRB 080905B: Enhanced Swift-XRT position
  62. GRB 080906: Swift detection of a burst with optical afterglow
  63. GRB080825C: Fermi-LAT observations
  64. GRB 080905B: Swift detection of a burst with possible optical counterpart
  65. GRB 080905: Swift detection of a probably-short burst
  66. GRB 080903: Swift/UVOT Observations
  67. GRB 080903: Swift-XRT Refined Analysis
  68. GRB 080903: Enhanced Swift-XRT position
  69. GRB 080903, Swift-BAT refined analysis
  70. GRB 080903: optical observations
  71. GRB 080903: Liverpool Telescope observations
  72. GRB 080903: Optical afterglow candidate
  73. GRB 080903: TAROT Calern observatory optical observations
  74. GRB 080903: ROTSE-III Optical Limits
  75. GRB 080903: Swift detection of a burst
  76. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  77. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  78. SGR 0501+4516: Confirmation of the NIR counterpart
  79. GRB080828: Swift/UVOT Upper Limits
  80. SGR 0501+4516: Detection of possible optical counterpart
  81. GRB080825B: Swift/UVOT Upper Limits
  82. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  83. Swift-BAT trigger 322590 is not a GRB
  84. Swift trigger 322590: BAT detection of a possible burst
  85. Enhanced Swift-XRT position of SGR 0501+4516
  86. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  87. GRB080825C: GLAST Burst Monitor detection
  88. GRB 080825B: Swift-XRT team analysis
  89. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  90. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  91. Suzaku ToO Observation of SGR 0501+4516
  92. Konus-Wind observations of new SGR 0501+4516
  93. SGR 0501+4516: Astrotel-Caucasus optical observations
  94. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  95. SGR 0501+4516: optical observations
  96. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  97. GRB 080822: Swift detection of a short burst
  98. GLAST Burst Monitor detection of a GRB: 080816B
  99. GLAST Burst Monitor detection of GRB080816
  100. GRB080810 - optical observations

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