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"

32757 results found.

  1. GRB 100213A: Swift XRT refined analysis
  2. GRB 100213B: NOT optical observations
  3. GRB 100206A: Second epoch Gemini-north observations and afterglow limits
  4. Swift/UVOT observations of GRB100212A - correction of the name of the burst
  5. Swift/UVOT observations of GRB120212A
  6. GRB 100212A: LOAO R-band Detection/V-band Observation
  7. GRB 100212A: Fermi GBM detection
  8. GRB 100212A: Swift XRT refined analysis
  9. GRB 100212A: Swift-BAT refined analysis
  10. GRB 100212A: candidate optical afterglow
  11. GRB 091127: Detection of a Supernova
  12. GRB 100205A: Keck limits on an underlying host galaxy
  13. GRB 100205A: BOAO/LOAO zYJK observation
  14. GRB 100206A: GROND upper limits
  15. GRB 100206A: Gemini-North observations
  16. GRB 100206A: Swift/UVOT Upper Limits
  17. GRB 100131A: MASTER-Net optical alert observations
  18. GRB 100206A: YNAO-GMG observations
  19. GRB 100206A: MASTER-Net optical alert observations
  20. GRB 100206A: PAIRITEL Photometry of Host Candidate
  21. GRB 100206A - Keck/LRIS Spectroscopy
  22. GRB100206: MITSuME optical upper limits
  23. GRB 100206A: NOT NIR observations
  24. GRB 100206A: WHT candidate afterglow
  25. GRB 100206A, RIMOTS optical upper limits
  26. GRB 100206A: optical observations from Southern Spain
  27. GRB 100205A: GROND upper limits
  28. GRB 100206A: Swift-XRT refined analysis
  29. GRB 100206A: Fermi GBM observation
  30. GRB 100206A: Optical limit
  31. GRB 100206A: Swift-BAT refined analysis
  32. GRB 100206A: Pre-explosion imaging and host candidate
  33. GRB100205A: CFHT z'-band observation
  34. GRB 100205A: Gemini-N + NIRI photometry
  35. GRB 100113A: Fermi GBM detection
  36. GRB 100205A: Swift-BAT refined analysis
  37. GRB 100205A: Swift UVOT upper limits
  38. GRB 100205A: Swift XRT refined analysis
  39. GRB 100203A: Swift XRT and UVOT refined analyses
  40. GRB 100205A Gemini-North IR afterglow candidate
  41. GRB 100205A: Gemini-South Observations
  42. GRB 100205A: Super-LOTIS early observations
  43. GRB 100131A: Suzaku WAM observation of the prompt emission
  44. GRB 100205A: NOT optical observations
  45. Short X-ray Transient detected by MAXI/GSC
  46. GRB 100119A: Suzaku WAM observation of the prompt emission
  47. Konus-Wind observation of GRB 100119A
  48. GRB 100116A: Suzaku WAM observation of the prompt emission
  49. GRB 100115A: Swift-XRT refined analysis
  50. GRB 100119A: Swift-BAT refined analysis
  51. GRB091109A: VLT/FORS2 spectroscopic redshift
  52. GRB 100117A: candidate optical afterglow
  53. Konus-Wind observation of GRB 100116A
  54. GRB 100117A: Gemini North spectroscopy
  55. GRB 100117A: Fermi GBM detection
  56. Swift/UVOT refined analysis of GRB100117A
  57. GRB 100117A: Optical object inside the revised XRT error circle
  58. GRB 100117A: Swift-XRT refined analysis
  59. GRB 100117A: Gemini-North upper limit
  60. GRB 100117A: Magellan IMACS imaging
  61. GRB 100117A: Gemini South Imaging and CFHT Pre-Explosion Images
  62. GRB 100117A: Swift-BAT refined analysis
  63. GRB100117A: Possible afterglow from NOT observation
  64. GRB 100115A: Gemini-N photometry
  65. GRB 100115A: SARA Astrometry
  66. GRB100115A: Revision of NOT observation
  67. NOT observation of GRB100115A localization
  68. GRB 100115A: SARA Afterglow Candidate
  69. GRB 100115A: Swift/UVOT Upper Limits
  70. GRB 100115A: Swift-XRT candidate afterglow
  71. GRB 100111A: PAIRITEL NIR Upper Limits
  72. GRB 100111A: Swift UVOT Refined Analysis
  73. GRB 100111A: Swift-BAT refined analysis
  74. GRB100111A: Swift-XRT refined analysis
  75. GRB 100111A: Fermi GBM observation
  76. GRB 100111A: NOT optical observations
  77. Swift/BAT Detects an Outburst from XTE J1901+014
  78. Swift Trigger #382159 is due to XTE J1752-223
  79. GRB 100103A: GROND Upper Limits
  80. GRB 100103A: Swift-XRT team refined analysis
  81. Konus-Wind observation of GRB 100103A
  82. GRB 100103A: Swift/UVOT Upper Limits
  83. GRB 100103A: Correction to Swift position error
  84. GRB 100103A: Swift/XRT position
  85. Swift Trigger 381591: Retraction of Reported UVOT Source
  86. Swift Trigger 381591 is probably not a burst
  87. GRB 091231: GROND NIR observations
  88. Swift Trigger 381591: Uncatalogued UVOT Source
  89. GRB 091230: Swift/UVOT Observations
  90. GRB 091230: Swift-XRT observation
  91. GRB 091230: GROND optical/NIR afterglow candidate
  92. GRB 091221 : IRSF NIR upper limit
  93. GRB 091221: Skynet/PROMPT Detections
  94. GRB 091221: Fermi GBM Observation
  95. GRB 091117: Swift-XRT late time observations
  96. GRB 091221 Swift-BAT refined analysis
  97. GRB091221: Swift/UVOT refined analysis, correction.
  98. GRB 091221: Swift/UVOT refined analysis
  99. GRB 091221: Swift-XRT refined analysis
  100. GRB 091221, GROND observations

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