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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"

19595 results found.

  1. GRB 110328A / Swift J164449.3+573451: EVLA observations of a brightening radio source
  2. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  3. GRB 110328A / Swift J164449.3+573451: Gemini and UKIRT IR observations
  4. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  5. GRB 110328A / Swift J164449.3+573451: No optical variability of the optical counterpart
  6. GRB 110328A / Swift J164449.3+573451: beamed emission
  7. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  8. GRB 110328A / Swift J164449.3+573451: CARMA mm detection
  9. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  10. GRB 110328A / Swift J164449.3+573451: LOAO R-band Observation
  11. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  12. GRB 110328A / Swift J164449.3+573451: optical observations
  13. GRB 110328A / Swift J164449.3+573451: EVLA Detection
  14. GRB 110328A / Swift J164449.3+573451: optical spectroscopy from GTC
  15. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  16. GRB 110328A/ Swift J164449.3+573451 : Xinglong TNT Upper limit
  17. GRB 110328A / Swift J164449.3+573451: PTF Quiescent Optical Counterpart
  18. GRB 110328A: Enhanced Swift-XRT position
  19. GRB 110328A: a second trigger, probably a hard X-ray transient (Swift J164449.3+573451)
  20. GRB 110328A: Swift detection of a burst
  21. GRB110318B : MOA optical upper limit
  22. GRB 110319B Swift-XRT afterglow confirmation
  23. GRB 110319B BAT refined analysis
  24. GRB 110319B: Swift/UVOT Upper Limits
  25. GRB 110318B: Swift/UVOT Upper Limits
  26. GRB 110319B: GROND upper limits
  27. GRB 110319B: Swift-XRT afterglow candidate.
  28. GRB 110319B found in ground analysis of Swift-BAT data
  29. GRB 110319A: Swift/UVOT Detection
  30. GRB 110319A: Swift-BAT refined analysis
  31. GRB 110319A: Swift-XRT refined Analysis
  32. GRB 110318B: GROND upper limits
  33. GRB 110319A: Enhanced Swift-XRT position
  34. GRB 110319A: Swift detection of a burst
  35. GRB 110318B: Swift-XRT refined Analysis
  36. GRB 110318A: Fermi GBM detection
  37. GRB 110318B: Swift-BAT refined analysis
  38. GRB 110318B: Enhanced Swift-XRT position
  39. GRB 110318A: Swift-BAT refined analysis
  40. GRB 110318B: Swift/UVOT Non-Detection of an Afterglow
  41. GRB 110318B: Swift detection of a burst
  42. GRB 110318A: Swift detection of a burst
  43. GRB 110315A: Swift/UVOT Upper Limits
  44. GRB 110315A: Swift-XRT refined Analysis
  45. GRB 110315A: Swift-BAT refined analysis
  46. GRB 110315A: Enhanced Swift-XRT position
  47. GRB 110315A: MASTER early optical observations
  48. GRB 110315A: Swift detection of a burst
  49. GRB 110312A: Swift/UVOT Upper Limits
  50. GRB 110312A: Swift-XRT refined Analysis
  51. GRB 110312A: GROND Upper Limits
  52. GRB 110312A: Enhanced Swift-XRT position
  53. GRB 110312A: Swift-BAT refined analysis
  54. GRB 110312A: Swift detection of a burst
  55. GRB 110305A: Swift/UVOT Upper Limits
  56. GRB 110305A: Swift-XRT refined Analysis
  57. GRB 110305A: Enhanced Swift-XRT position
  58. GRB 110305A: Swift-BAT refined analysis
  59. GRB 110305A: GROND Detection of Optical Afterglow
  60. GRB 110305A: Swift detection of a burst
  61. GRB 110223A: optical upper limits
  62. Swift/UVOT observations of GRB110223A
  63. No IPN GRB detected in conjunction with candidate GRB 110215
  64. GRB GRB 110223A: MASTER VWF early optical observations
  65. Swift/UVOT observations of GRB110223b
  66. GRB 110223A: Swift-BAT refined analysis
  67. GRB 110223A: Swift-XRT refined Analysis
  68. GRB 110223B: Swift-XRT refined Analysis
  69. GRB 110223A: Enhanced Swift-XRT position
  70. GRB 110223B: Enhanced Swift-XRT position
  71. GRB 110223B: Swift-BAT refined analysis
  72. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  73. GRB 110223B: Swift detection of a burst
  74. GRB 110223A: Swift detection of a burst
  75. GRB 110213B: Swift/UVOT observations
  76. GRB110213B: X-ray afterglow confirmation
  77. Fermi GBM detection of an SGR-like burst
  78. Swift XRT and UVOT Observations of OT 110215
  79. GRB 110213A: optical observations in CrAO
  80. GRB 110213A: optical observations in Mondy
  81. Swift/UVOT observations of GRB110210a.
  82. GRB 110210A: optical upper limit
  83. GRB 110210A: ROVOR Upper Limit
  84. GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
  85. GRB 110212A: Swift XRT and UVOT observations
  86. Swift GRB110213A: interesting behaviour
  87. GRB 110213A: Fermi GBM observation
  88. GRB 110205A: Konkoly optical observations
  89. GRB 110213B: Swift XRT observation
  90. Konus-Wind observation of GRB 110213A
  91. GRB 110213A: Swift-XRT refined Analysis
  92. GRB 110213A: Swift/UVOT refined analysis
  93. GRB 110213A: Lightbuckets Optical Observations
  94. GRB 110213A, Swift-BAT refined analysis
  95. GRB 110213A: optical observations
  96. GRB 110213A: Enhanced Swift-XRT position
  97. GRB 110213A: Bok Telescope Redshift
  98. GRB 110213A: ROTSE-III Detection of Optical Counterpart
  99. GRB 110213A: Swift detection of a burst with optical afterglow
  100. GRB 110212A: GRT Optical Observation

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