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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19533 results found.

  1. GRB 110530A: optical observations in Mondy observatory
  2. GRB 110530A: optical observations at Mt. Terskol, second epoch
  3. GRB 110530A: Swift-XRT refined Analysis
  4. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  5. GRB 110530A: Enhanced Swift-XRT position
  6. GRB 110530A: optical observations at Mt. Terskol
  7. GRB 110530A: MASTER OT observations
  8. GRB 110530A: Swift-BAT refined analysis
  9. GRB 110530A: Swift detection of a burst with an optical afterglow
  10. EVLA afterglow limits on the high z GRB090429B
  11. Swift J1644+57/GRB 110328A, Additional HST Observations
  12. GRB 110521A: MASTER prompt optical limit
  13. GRB 110521A: Swift/UVOT Upper Limits
  14. GRB 110521A: Swift-XRT refined analysis
  15. GRB 110521A: Swift-BAT refined analysis
  16. GRB 110521A: Enhanced Swift-XRT position
  17. GRB 110521A: MASTER synchronous and early optical observations limit
  18. Swift/UVOT observations of GRB110520A
  19. GRB 110521A: Swift detection of a burst
  20. GRB 110520A: Swift-BAT refined analysis
  21. GRB 110520A: Swift-XRT refined Analysis
  22. GRB 110520A: Enhanced Swift-XRT position
  23. GRB 110520A: Skynet/DAO optical observations
  24. GRB 110520A: Liverpool Telescope Observations
  25. GRB 110520A: TAROT Calern observatory optical observations
  26. GRB 110520A: MASTER-NET optical observations
  27. GRB 110520A: Swift detection of a burst
  28. IPN localization of bright GRB 110518A
  29. GRB 110519A, Swift-BAT refined analysis
  30. GRB 110519A: Swift detection of a burst
  31. GRB 110503A optical observation
  32. GRB 110428A: Fermi-GBM observation
  33. GRB 110503A: TAROT Calern observatory optical observations
  34. GRB 110503A optical observations
  35. Konus-Wind observation of GRB 110503A
  36. GRB 110503A: Centimeter observation from EVLA
  37. GRB 110503A: Swift/UVOT Observations
  38. GRB 110503A: Swift-XRT refined Analysis
  39. GRB 110503A: PAIRITEL NIR Detection
  40. GRB 110503A: Swift-BAT refined analysis
  41. GRB 110503A: Enhanced Swift-XRT position
  42. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  43. GRB 110426A: Swift/XRT non-detection
  44. GRB 110428A : X-ray afterglow confirmation
  45. GRB 110428A: Suzaku WAM observation of the prompt emission
  46. GRB 110422A: optical observations in CrAO
  47. GRB 110428A : Swift-XRT observations
  48. GRB 110422A: optical observations in CrAO, second epoch
  49. GRB 110422A: Suzaku WAM observation of the prompt emission
  50. GRB 110422A: optical observations in CrAO
  51. Konus-Wind observation of GRB 110422A
  52. GRB 110422A: Swift/UVOT Detection of optical afterglow
  53. GRB 110422A: Swift-XRT refined Analysis
  54. GRB 110422A: Enhanced Swift-XRT position
  55. GRB 110422A: MASTER earlier OT polarization observations
  56. GRB 110422A: Swift-BAT refined analysis
  57. GRB 110422A: Swift detection of a burst
  58. GRB 110328A/Swift J164449.3+573451: Maidanak Optical Observation
  59. GRB 110420B: Swift/UVOT Upper Limits
  60. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  61. GRB 110420B: Swift-XRT afterglow candidate retraction
  62. GRB 110420B: Fermi GBM observation
  63. Konus-Wind observation of GRB 110420A
  64. GRB 110420B: Spectral lag indicates short hard burst
  65. GRB 110420B, GROND observations
  66. GRB 110420A Swift/UVOT Observations
  67. GRB 110420B: Swift-XRT afterglow candidate
  68. GRB 110420B: Swift-BAT refined analysis
  69. GRB 110420A: Swift-BAT refined analysis
  70. GRB 110420B: Swift detection of a short hard burst
  71. GRB 110420A: Swift-XRT refined Analysis
  72. GRB 110420A: Enhanced Swift-XRT position
  73. GRB 110420A: Swift detection of a burst with optical counterpart
  74. GRB 110414A: GROND upper limits
  75. GRB 110414A: Swift-BAT Refined Analysis
  76. GRB 110414A: Swift/UVOT Upper limits
  77. GRB 110414A: Swift-XRT refined Analysis
  78. GRB 110414A: Enhanced Swift-XRT position
  79. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  80. GRB 110414A : Faulkes Telescope North observations
  81. GRB 110414A: Swift detection of a burst
  82. GRB 110411A: PAIRITEL NIR Upper Limits
  83. GRB 110412A: Swift-BAT refined analysis
  84. GRB 110411A: Swift-XRT refined Analysis
  85. GRB 110412A: Fermi GBM observation
  86. GRB 110411A: Swift/UVOT Upper Limits
  87. GRB 110412A: Swift detection of a burst
  88. GRB 110411A, Swift-BAT refined analysis
  89. GRB 110411A: Enhanced Swift-XRT position
  90. GRB 110411A: MASTER optical observations
  91. GRB 110411A: Swift detection of a burst
  92. GRB 110328A / Swift J164449.3+573451: R-band Monitoring
  93. GRB 110407A: Swift-XRT refined Analysis
  94. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  95. GRB 110328A / Swift J164449.3+573451: optical observations
  96. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  97. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  98. GRB 110407A: MASTER optical observations
  99. GRB110407A: UVOT Upper Limits
  100. GRB 110407A: GROND Detection of the Optical Afterglow

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