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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"

19665 results found.

  1. GRB 150821A: GROND afterglow observations
  2. GRB 150821A: Swift-XRT refined Analysis
  3. GRB 150819A: Mondy and TSHAO optical upper limits
  4. GRB 150821A: Swift/UVOT Detection
  5. GRB 150821A: Enhanced Swift-XRT position
  6. GRB 150821A: Fermi GBM detection
  7. GRB 150818A: continued Mondy optical observations
  8. Swift Trigger 652824 is due to noise
  9. GRB 150821A: Swift detection of a burst with an optical afterglow
  10. Swift Trigger 652824: Is most likely a noise fluctuation in the direction of M31
  11. GRB 120729A: KAIT Optical Observations
  12. KAIT Optical Upper Limits for GRB 120422A, 120724A, 120803B, 120911A, and 120923A
  13. GRB 150818A: Mondy optical observations
  14. GRB 150818A: 10.4m GTC spectroscopy and host galaxy
  15. GRB 150818A: Mondy optical observations
  16. GRB 150819A: RATIR Optical Observations
  17. GRB 150819A: Swift-XRT refined Analysis
  18. GRB 150819A: Swift-BAT refined analysis
  19. GRB 150819A: MASTER-IAC early upper limit
  20. GRB 150819A: Swift/UVOT Upper Limits
  21. GRB 150819A: Enhanced Swift-XRT position
  22. GRB 150818A: Swift-XRT update, correction to GCN 18162
  23. GRB 150819A: Prompt enhanced Swift-XRT position
  24. GRB 150819A: Swift detection of a burst
  25. GRB 150818A: Swift-XRT refined Analysis
  26. GRB 150818A: Swift/UVOT Detection
  27. GRB 150817A: AAO optical observations
  28. GRB 150818A: Enhanced Swift-XRT position
  29. GRB 150817A: LCOGT observations
  30. GRB 150818A: Swift-BAT refined analysis
  31. GRB 150817A: Continued RATIR Optical Observations - Afterglow Confirmation
  32. GRB 150818A: Swift/UVOT candidate afterglow
  33. GRB 150817A: P60 Observations
  34. GRB 150818A: Swift detection of a burst
  35. GRB 150817A: Swift/UVOT Upper Limits
  36. GRB 150817A: Fermi GBM observation
  37. GRB 150817A: Swift-BAT refined analysis
  38. GRB 150817A: Swift-XRT refined Analysis
  39. GRB 150817A: Enhanced Swift-XRT position
  40. GRB 150817A: RATIR Optical Afterglow Candidate
  41. GRB 150817A: Swift detection of a burst
  42. Swift Trigger 652046 is a particle shower event
  43. Swift Trigger 652046 is probably not a GRB
  44. GRB 150811A: KAIT Refined Analysis
  45. GRB 150811A: Swift/UVOT further observations
  46. GRB 150811A: Swift-BAT refined analysis
  47. GRB 150811A: Swift-XRT refined Analysis
  48. GRB 150811A: Enhanced Swift-XRT position
  49. GRB 150811A: Swift/UVOT Detection
  50. GRB 150811A: KAIT optical candidate
  51. GRB 150811A: RATIR Optical Afterglow Detection
  52. GRB 150811A: Swift detection of a burst
  53. GRB 150727A: IRSF NIR observation
  54. GRB 150801A: Swift-XRT observations
  55. GRB 150801B: Swift/UVOT Upper Limits
  56. GRB 150801B: Swift-BAT refined analysis
  57. GRB 150801B: Swift-XRT refined Analysis
  58. GRB 150801B: Enhanced Swift-XRT position
  59. GRB 150801B: Swift detection of a burst
  60. GRB 150801A: Tiled Swift observations
  61. GRB 150724B: Swift-XRT afterglow detection
  62. GRB150724B: Retraction of the uvot detection
  63. GRB 150728A: TSHAO optical observations
  64. GRB 150728A: RATIR Optical Observations
  65. GRB 150728A: AAO optical observations
  66. GRB 150728A: Swift-XRT refined Analysis
  67. GRB 150728A: Swift/UVOT Upper Limits
  68. GRB 150728A: Swift-BAT refined analysis
  69. GRB 150728A: FTN observations
  70. GRB 150727A: RATIR Optical Observations
  71. GRB 150728A: Enhanced Swift-XRT position
  72. GRB 150728A: Swift detection of a GRB
  73. GRB 150727A: Swift-BAT refined analysis
  74. GRB 150727A: Swift/UVOT Detection
  75. GRB 150727A: Swift-XRT refined Analysis
  76. GRB 150727A: Fermi GBM detection
  77. GRB 150727A: Enhanced Swift-XRT position
  78. GRB 150724B: MASTER upper limit
  79. GRB 150727A: Swift detection of a burst with an optical counterpart
  80. GRB 150724B: Swift/UVOT Detection
  81. GRB 150724B: RATIR Optical Observations
  82. Swift Trigger 650408 is not a burst
  83. Swift 650221/IGR J00291+5934: Liverpool Telescope observations
  84. GRB 150724B: Swift-XRT observations
  85. GRB 150724B: Swift ToO observations
  86. IGR J00291+5934, Swift-BAT refined analysis
  87. GRB 150724B: Fermi-LAT detection
  88. Swift Trigger 650221 / IGR J00291+5934: MASTER-IAC OT observations
  89. Trigger 650221: Swift detection of a IGR J00291+5934
  90. Correction to GCN 18059: Parameterisation of Swift-XRT light curve
  91. GRB 150724A: Swift-XRT refined Analysis
  92. Swift IGR J00291+5934: MASTER Optical flare detection
  93. GRB 150724A: Swift/UVOT Upper Limits
  94. IGR J00291+5934: Swift-BAT refined analysis
  95. GRB 150724A: Swift-BAT refined analysis
  96. GRB 150724A: Enhanced Swift-XRT position
  97. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  98. GRB 150724A: Prompt enhanced Swift-XRT position
  99. Trigger 650140: Swift detection of IGR J00291+5934
  100. GRB 150724A: Swift detection of a burst

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