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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"

19662 results found.

  1. GRB 080928, Swift-BAT initial refined analysis
  2. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  3. GRB 080928: Swift detection of a burst with an optical counterpart
  4. Swift-BAT trigger 325707 is not a GRB
  5. Swift trigger 325707: Swift/UVOT Upper Limits
  6. Swift trigger 325707: Swift-XRT upper limit
  7. Swift detection of a possible GRB (trigger 325707)
  8. GRB080916A: Suzaku WAM observation of the prompt emission
  9. GRB 080922: Swift/UVOT Upper Limits
  10. GRB080922: Swift-XRT upper limit
  11. Trigger 324561: IGR J08408-4503 detected by Swift
  12. GRB 080919: Swift/UVOT Refined Analysis
  13. GRB 080919: Swift-XRT refined analysis
  14. GRB 080919, Swift-BAT refined analysis
  15. GRB 080919: Swift detection of a short burst
  16. GRB080913: Swift-BAT spectral lag
  17. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  18. GRB 080916A: Fermi GBM detection
  19. GRB 080916C: Swift UVOT Refined Analysis
  20. GRB 080916C: Swift XRT refined analysis
  21. GRB 080916B: Swift-XRT refined analysis
  22. Konus-Wind observation of GRB 080916A
  23. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  24. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  25. GRB 080916C: Enhanced XRT position
  26. GRB 080916C: Swift/XRT detection of possible afterglow
  27. GRB 080916B: Swift UVOT Refined Analysis
  28. GRB 080916B, Swift-BAT refined analysis
  29. GRB080916A: Refined Swift/UVOT Observations
  30. GRB 080916B: Enhanced Swift-XRT position
  31. GRB 080916A: Swift XRT refined analysis
  32. GRB 080916A, Swift-BAT refined analysis
  33. GRB 080916B: Swift-XRT afterglow detection
  34. GRB 080916A: Enhanced Swift-XRT position
  35. GRB 080916B: Swift detection of a burst
  36. GRB 080916: Swift detection of a burst with optical afterglow
  37. GRB 080915B, Swift-BAT refined analysis
  38. GRB 080915B: Swift detection of a burst
  39. GRB 080915: Swift/UVOT Upper Limits
  40. GRB 080915: Swift-XRT afterglow detection and analysis
  41. GRB 080915, Swift-BAT refined analysis
  42. GRB 080915: ROTSE-III Optical Limits
  43. GRB 080915: Swift detection of a burst
  44. GRB 080913: Swift-XRT refined analysis
  45. GRB080913: Swift/UVOT Upper Limits
  46. GRB 080913: GROND photo-z
  47. GRB 080913, Swift-BAT refined analysis
  48. GRB 080913: VLT/FORS2 observations
  49. GRB 080913: Enhanced Swift-XRT position
  50. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  51. GRB 080913: Swift detection of a burst
  52. GRB 080906: Watcher observations
  53. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  54. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  55. Swift trigger 324362 (LS I +61 303 ?): XRT
  56. GRB 080905B: Photometric Redshift for the 2MASS Galaxy
  57. Swift trigger 324362 (LS I +61 303 ?)
  58. GRB080905A: Swift/UVOT Upper Limits
  59. GRB 080905B: Watcher optical detection
  60. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  61. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  62. GRB 080905A: Enhanced Swift-XRT position
  63. Swift Trigger 324122 is again known source Swift J1842.5-1124
  64. Swift Trigger 324116 is known source again
  65. Swift Trigger 324112 is known source Swift J1842.5-1124
  66. GRB 080906: Refined Swift/UVOT Observations
  67. GRB 080906: Swift-XRT Refined Analysis
  68. GRB 080906, Swift-BAT refined analysis
  69. GRB 080906: GROND observations of the optical/NIR afterglow
  70. GRB 080905B: Swift-XRT Refined Analysis
  71. GRB 080905B: Refined UVOT Analysis
  72. GRB 080905B: Enhanced Swift-XRT position
  73. GRB 080905B, Swift-BAT refined analysis
  74. GRB 080905A, Swift-BAT refined analysis
  75. GRB 080906: Swift detection of a burst with optical afterglow
  76. GRB 080905A: Swift-XRT Refined Analysis
  77. GRB 080905B: Swift detection of a burst with possible optical counterpart
  78. GRB 080905: R & I-band optical observations
  79. GRB 080905: Swift detection of a probably-short burst
  80. GRB 080903: Swift/UVOT Observations
  81. GRB 080903: Swift-XRT Refined Analysis
  82. GRB 080903: Enhanced Swift-XRT position
  83. GRB 080903, Swift-BAT refined analysis
  84. GRB 080903: Astrotel-Caucasus optical observations
  85. GRB 080903: TAROT Calern observatory optical observations
  86. GRB 080903: ROTSE-III Optical Limits
  87. GRB 080903: Swift detection of a burst
  88. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  89. GRB080828: Swift/UVOT Upper Limits
  90. GRB080825B: Swift/UVOT Upper Limits
  91. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  92. Swift-BAT trigger 322590 is not a GRB
  93. Swift trigger 322590: BAT detection of a possible burst
  94. SGR 0501+4516: Decline in Activity
  95. SGR 0501+4516: Proximity to supernova remnant HB9
  96. Enhanced Swift-XRT position of SGR 0501+4516
  97. SGR 0501+4516: Swift XRT measure of the spin period
  98. GRB 080825B: Swift-XRT team analysis
  99. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  100. SGR 0501+4516: radio pulsar searches with GBT and WSRT

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