Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

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"

28302 results found.

  1. GRB 111209A: Swift Burst of Interest
  2. GRB 111209A, Swift-BAT refined analysis
  3. GRB 111209A: Enhanced Swift-XRT position
  4. GRB 111205A: GROND observations
  5. GRB 111209A: REM NIR detection
  6. GRB 111209A: TAROT La Silla observatory optical detection
  7. GRB 111209A: Swift detection of a long burst with an optical counterpart
  8. GRB 111208A: Swift XRT/UVOT observations
  9. GRB 111205A: Swift XRT Observations
  10. GRB 111207A found in ground analysis of BAT data
  11. GRB 111208A found in ground analysis of BAT data
  12. GRB 111204A: TNG NIR observations
  13. GRB 111201A: GMG optical observation
  14. GRB 111204A: GROND Observations
  15. GRB 111204A: Swift-XRT refined Analysis
  16. GRB 111204A, Swift-BAT refined analysis
  17. GRB 111022B: CrAO optical limit
  18. GRB 111204A: Swift/UVOT Upper Limits
  19. GRB 110921A: optical observations in Maidanak observatory
  20. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
  21. GRB 111204A: Enhanced Swift-XRT position
  22. GRB 111123A: optical upper limit in CrAO
  23. GRB 111204A: Swift detection of a burst
  24. GRB 111201A: Swift/UVOT Upper Limits
  25. GRB111201A: Swift-XRT observations
  26. GRB 111201A found in ground analysis of BAT data
  27. GRB 111121A: Suzaku WAM observation of the prompt emission
  28. GRB 111129A: Swift/UVOT Detection
  29. GRB 111129A, GROND afterglow observations
  30. GRB 111129A: Swift-XRT refined Analysis
  31. GRB 111129A: Swift-BAT refined analysis
  32. GRB 111129A: Enhanced Swift-XRT position
  33. GRB 111129A: Swift detection of a burst with an optical counterpart
  34. GRB 111123A, Swift-BAT refined analysis
  35. GRB 111123A: Swift/UVOT Upper Limits
  36. GRB 111123A - NOT optical observations
  37. GRB 111123A, GROND observations
  38. GRB 111123A: TNG NIR detection of the afterglow candidate
  39. GRB 111123A: Swift-XRT refined Analysis
  40. GRB 111123A: MITSuME Okayama Optical upper limits
  41. GRB 111123A: Enhanced Swift-XRT position
  42. GRB 111123A: GMG optical observation
  43. GRB 111123A: Swift detection of a burst
  44. GRB 111117A, the review of the sky area in plate archives
  45. GRB 111121A: Swift/UVOT Upper Limits
  46. GRB 111121A: Magellan/Megacam observations
  47. GRB 111121A: Swift-XRT refined Analysis
  48. GRB 111121A: Swift-BAT refined analysis
  49. GRB 111117A: Chandra detection of the afterglow
  50. GRB 111121A: Enhanced Swift-XRT position
  51. GRB 111121A: Swift detection of a short hard burst
  52. GRB 111117A: Gemini Afterglow Limits
  53. GRB 111117A: optical upper limit in CrAO
  54. GRB 111117A: Fermi GBM observation
  55. GRB 111117A: TNG observations
  56. GRB 111117A: Swift/UVOT Upper Limits
  57. GRB 111117A: GROND observations
  58. GRB 111117A: Gemini host observation
  59. GRB 111117A: Swift-XRT refined Analysis
  60. GRB 111117A: NOT observations
  61. GRB 111117A: Chandra ToO observation scheduled
  62. GRB 111117A: Swift-BAT refined analysis of a short hard burst
  63. GRB 111117A: GMG upper limit
  64. GRB 111117A: Swift detection of a short hard burst
  65. GRB111107A: ATCA observations - upper limit and a possible detection
  66. IPN Triangulation of GRB 111113A (short/hard/intense)
  67. XRF 111111A/MAXI J0158-744: MAXI GSC and SSC detection of a soft X-ray transient near SMC
  68. GRB 111109A: Swift-XRT refined Analysis
  69. GRB 111109A: Swift/UVOT Photometry
  70. GRB 111109A: Swift-BAT refined analysis
  71. GRB 111109A: Enhanced Swift-XRT position
  72. GRB 111109A: Swift-XRT observations
  73. GRB 111109A: Swift detection of a burst
  74. GRB 111103B: optical upper limit of CrAO
  75. GRB 111103B: optical upper limit of Mt. Terskol observatory
  76. GRB 111107A: Fermi GBM observation
  77. Continued Skynet observations of GRB111107A
  78. GRB 111107A: Swift-XRT refined Analysis
  79. GRB 111107A: APEX submm observation
  80. GRB 111107A: Swift/UVOT Afterglow Analysis
  81. GRB 111107A: Swift-BAT refined analysis
  82. GRB 111107A: Enhanced Swift-XRT position
  83. GRB 111107A: GROND observations
  84. Skynet observations of GRB 111107A
  85. GRB 111107A: Swift detection of a burst with an optical counterpart
  86. GRB 111103B : WIYN 3.5m NIR observations
  87. GRB 111103B: Swift-XRT refined Analysis
  88. GRB 111103A: Fermi GBM observation
  89. GRB111103B Swift/UVOT Upper Limits
  90. GRB 111103B: Enhanced Swift-XRT position
  91. GRB 111103B: Swift-BAT refined analysis
  92. GRB 111103A: Swift-BAT refined analysis
  93. Trigger 506913: Swift detection of Swift J1922.7-1716 and its optical counterpart
  94. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  95. GRB 111029A: RAPTOR Limits During the Gamma-ray Emitting Interval
  96. GRB 111029A: SAO RAS optical limits
  97. GRB 111029A: Super-LOTIS early limits
  98. All GCN Circulars available in a tarfile for data mining
  99. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  100. GRB 111029A: Swift-XRT refined Analysis

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov