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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

45437 results found.

  1. GRB 111022B: MITSuME Akeno Optical upper limits
  2. GRB 111022B: NOT observations
  3. GRB 111022B: Enhanced Swift-XRT position
  4. GRB 111020A Spectral lag analysis
  5. GRB 111022A: Swift-BAT refined analysis
  6. GRB 111022B: MASTER-Net early limit
  7. GRB 111022A: Preliminary UVOT TDRSS Non-Detection
  8. GRB 111022A: MASTER-Net early limit
  9. GRB 111022B: Swift detection of a burst
  10. GRB 111022A: Swift detection of a burst
  11. GRB 111020A: Gemini-South additional observations and limit on an optical afterglow
  12. GRB 111020A: EVLA observations
  13. GRB 111020A: Swift-XRT refined Analysis
  14. GRB 111020A: Gemini-South i-band observations
  15. GRB 111020A: Swift/UVOT Upper Limits
  16. GRB 111020A: Swift-BAT refined analysis
  17. GRB 111020A: Enhanced Swift-XRT position
  18. GRB 111020A: BOOTES-3 Optical Upper Limit.
  19. GRB 111020A: Planned XMM-Newton observation
  20. GRB 111020A: Swift detection of a short burst
  21. GRB 111018A: Swift/UVOT Upper Limits
  22. GRB 110918A: Optical light curve for days 1.4 to 16.3
  23. GRB 111018A: Swift-BAT refined analysis
  24. Konus-Wind observation of GRB 111016B
  25. GRB 111018A: Swift-XRT refined Analysis
  26. GRB 111018A: GROND Upper Limits
  27. GRB 111018A: Enhanced Swift-XRT position
  28. IPN Triangulation of GRB 111016B (long duration, intense)
  29. GRB111016A : WIYN 3.5m NIR observations
  30. GRB 111018A: Swift detection of a burst
  31. GRB 111017A: Fermi GBM Detection
  32. GRB111016A: D50 optical limit
  33. GRB 111016A: Gemini Detection of the NIR Counterpart
  34. GRB 111016A: Swift/UVOT Detection of a Source
  35. GRB 111016A: Swift-BAT refined analysis
  36. GRB 111016A: P60 Afterglow Candidate
  37. GRB 111016A: MITSuME Akeno Optical upper limits
  38. GRB 111016A: Swift-XRT refined Analysis
  39. GRB 111016A: Enhanced Swift-XRT position
  40. GRB 111016A: Swift-XRT observations
  41. GRB 111016A: Swift detection of a burst
  42. GRB 110921A: optical observations
  43. GRB 111008A : miniTAO/ANIR NIR observations
  44. EVLA 22 GHz Detection of GRB 111008A
  45. GRB 111005A: ATCA 18 GHz decay
  46. GRB 111008A: Swift/UVOT Upper Limits
  47. Konus-Wind observation of GRB 111008A
  48. GRB 111008A: IAC80 I-band observations
  49. GRB 111008A: VLT/X-shooter spectroscopy
  50. GRB 111008A: Swift-XRT refined Analysis
  51. GRB 111008A: Gemini spectroscopic redshift
  52. GRB 111008A, GROND observations
  53. GRB 111008A: NOT optical observation
  54. GRB 111008A: Gemini optical counterpart
  55. GRB 111008A: Enhanced Swift-XRT position
  56. GRB 111008A, Swift-BAT refined analysis,
  57. GRB 111008A: Swift detection of a burst
  58. GRB 111005A: ATCA 18 GHz detection
  59. GRB 111005A: ATCA radio upper limit
  60. GRB 111005A : miniTAO/ANIR NIR observations
  61. GRB 111005A: EVLA Observations
  62. GRB 111005A: VLT optical observations
  63. GRB 111005A: GROND NIR observations
  64. GRB 111005A: VLT IR observations
  65. GRB 111005A: Swift-BAT refined analysis
  66. GRB 111005A: bright galaxy in error circle
  67. GRB 111005A: Swift detection of a burst
  68. GRB 111003A: Fermi GBM detection
  69. GRB 110905A / MAXI J1836-194: optical monitoring
  70. GRB 110921A: MITSuME-Akeno Optical photometry
  71. Skynet/Dolomiti observations of GRB 110928A
  72. Skynet observations of GRB 110928A
  73. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  74. GRB 110928A: Swift/UVOT Upper Limits
  75. Trigger 504307: Swift detection of MAXI J1836-194
  76. GRB 110928A: Swift-XRT refined Analysis
  77. GRB 110825A: GROND Observations
  78. GRB 110928A: Enhanced Swift-XRT position
  79. GRB 110928A: P60 Observations
  80. GRB 110928A: Further PAIRITEL NIR Observations
  81. GRB 110928A: Swift-BAT refined analysis
  82. GRB 110928A: Swift-XRT observations
  83. GRB 110928A: Swift/UVOT finding chart observation
  84. GRB 110928A: PAIRITEL NIR Observations
  85. GRB 110928A: ROTSE-III Optical Limits
  86. GRB 110928A: Swift detection of a burst
  87. Fermi GBM triggers 110923481, 110924391 and 110925200 are not GRBs
  88. Swift-BAT trigger 503926 is noise
  89. GRB 110924A: Swift detection of a possible burst
  90. GCN for GRB 110921B
  91. GRB 110921A: Swift/UVOT Observations
  92. GRB110918A: Lick Observations
  93. GRB 110921A: NOT observations
  94. GRB 110921A: Fermi GBM observation
  95. GRB 110921A: TNT astrometry
  96. GRB 110921A: Swift-XRT refined Analysis
  97. GRB 110921A, Swift-BAT refined analysis
  98. GRB 110918A: Liverpool Telescope optical observations
  99. GRB 110918A: submm observations from APEX
  100. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories

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