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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"

28090 results found.

  1. Swift/UVOT observations of GRB110201A
  2. GRB 110201A: Swift-BAT refined analysis
  3. GRB 110201A: Swift detection of a burst
  4. GRB110112B: EVLA Observations
  5. GRB110112A: EVLA Observations
  6. GRB110128A: MITSuME Okayama optical upper limits
  7. GRB 110125A: Fermi GBM detection
  8. GRB 101112A: Maidanak and CrAO optical observations
  9. GRB110128A: TNG NIR observations
  10. GRB 110128A, Swift-BAT refined analysis
  11. GRB 110128A: Swift/UVOT observations
  12. GRB 110128A: Swift-XRT refined Analysis
  13. GRB 110120A: Suzaku WAM observation of the prompt emission
  14. GRB 110128A: WHT redshifts of nearby field galaxies
  15. GRB 110128A: Enhanced Swift-XRT position
  16. GRB 110128A: Afterglow detection from NOT
  17. GRB 110128A: TAROT Calern observatory upper limits
  18. GRB 110128A: Swift detection of a burst
  19. IBAS Alerts n. 6130 and 6131 are not due to a GRB
  20. GRB 110123A: Fermi GBM detection
  21. GRB 110106B, radio observations
  22. GRB 110120A: MASTER optical observations
  23. GRB 101224A, the review of the sky area in plate archives
  24. IPN triangulation of GRB 110120A
  25. GRB 101225A: CQUEAN optical observation
  26. GRB 110106A: CrAO optical observations
  27. GRB 110119A: Fermi GBM detection
  28. GRB 110120A: Fermi GBM detection
  29. GRB 110119A: Suzaku WAM observation of the prompt emission
  30. GRB 110112A: optical upper limit
  31. GRB110119: Swift/UVOT Detection
  32. GRB 110119A: Swift-XRT refined Analysis
  33. GRB110119A: MITSuME Okayama optical upper limits
  34. GRB 110119A: Swift-BAT refined analysis
  35. GRB 110119A: PAIRITEL NIR Afterglow Detection
  36. GRB 110119A: Enhanced Swift-XRT position
  37. GRB 110119A: Swift detection of a burst with an optical detection
  38. GRB110106A, mm-radio observations
  39. GRB 101219B: GROND detection of a SN signature
  40. Swift-BAT trigger 442771 is a noise fluctuation
  41. New feature in Fermi GBM GRB Ground Position Notices
  42. Swift-BAT Trigger 442539 is not a GRB
  43. Swift Trigger 442539 is probably not a GRB
  44. Short GRB 110112B : early optical limit by "Pi of the Sky"
  45. GRB101225A - timing analysis
  46. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  47. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  48. GRB 110107A: Swift-XRT afterglow confirmation
  49. GRB 101225A: HST observations - no host detected
  50. GRB 110112A: Swift-XRT refined Analysis
  51. GRB 110112A: Swift/UVOT upper limits
  52. GRB 110112A: WHT candidate afterglow/host galaxy
  53. GRB 110112A: Swift-BAT refined analysis
  54. GRB 110112A: Enhanced Swift-XRT position
  55. GRB110112A: TNT optical afterglow candidate
  56. GRB 110112A: Swift detection of a possible short burst
  57. GRB 110107A: Swift/UVOT upper limits
  58. GRB 101219b. Possible radio afterglow detection.
  59. GRB 110107A: Swift-XRT Afterglow Candidate
  60. GRB 110106B: Fermi GBM detection
  61. GRB 110106B: Swift-XRT refined Analysis
  62. GRB 110106A: TNG NIR observations
  63. GRB 110106A: ISAS-Kanazawa optical upper limit
  64. GRB 110106A: MITSuME Okayama optical upper limits
  65. GRB 110106B: Swift-BAT refined analysis
  66. GRB 110106B: Enhanced Swift-XRT position
  67. GRB 110106A: Swift/UVOT Upper Limits
  68. GRB 110106A: TNG redshift of the closeby galaxy
  69. GRB 110106A: Swift-XRT refined Analysis
  70. GRB 110106A: Swift-BAT refined analysis
  71. GRB 110106A: Enhanced Swift-XRT position
  72. GRB 110106B: Swift detection of a burst
  73. GRB 110106A: TNG optical observations and candidate counterparts
  74. GRB 110106A: Swift detection of a burst
  75. GRB 101225A: Host galaxy
  76. GRB 110102A: Swift-XRT refined Analysis
  77. GRB110102A: Swift/UVOT observations
  78. GRB110102A: MITSuME Okayama Optical Observation
  79. GRB 110102A: Fermi GBM observation
  80. GRB 110102A: Swift-BAT refined analysis
  81. GRB 110102A: Enhanced Swift-XRT position
  82. GRB 110102A: Swift detection of a burst with an optical detection
  83. GRB 101225A: optical break from NOT observation
  84. GRB 101225A: P60 Observations
  85. GRB 101225A: MAXI/GSC observations
  86. GRB 101225A Late-time emission observed by Swift-BAT
  87. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  88. GRB 101225A, Swift-BAT refined analysis
  89. GRB 101225A: Swift/UVOT Detection
  90. GRB 101225A: Swift-XRT refined Analysis
  91. GRB 101225A: Enhanced Swift-XRT position
  92. Trigger 441015 / GRB 101225A: Further NOT optical observation
  93. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  94. GRB 101225A (Swift trigger 441015): optical upper limit
  95. Trigger 441015: Swift detection of a possible burst or transient
  96. GRB 101224A: NOT optical observation
  97. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  98. GRB 101224A: Swift/UVOT Upper Limits
  99. GRB 101224A: Swift-XRT refined Analysis
  100. GRB101224A: MITSuME Okayama optical upper limits

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