Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

32715 results found.

  1. GRB 081029: REM observations
  2. Radio observation of GRB 080303 with ATCA
  3. Radio observation of GRB 080411 with ATCA
  4. GRB 081029: UVES/VLT Absorption Redshift
  5. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  6. GRB 081029: ROTSE-III Detection of Optical Counterpart
  7. GRB 081028: Magellan redshift
  8. GRB081028: UVOT detection of a brightening afterglow
  9. Swift UVOT observations of GRB081028
  10. GRB 081028: Swift-XRT refined analysis
  11. GRB 081028, Swift-BAT refined analysis
  12. GRB 081028: TAROT Calern observatory optical observations
  13. GRB 081028: optical observations at the NOT
  14. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  15. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  16. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  17. GRB 081025: TLS upper limits
  18. GRB 081024: No radio detection with the VLA
  19. GRB081024B: P200 Observations
  20. GRB 081024B: Swift-XRT further observations
  21. GRB 081025 BAT refined analysis
  22. Swift UVOT observations of GRB081025
  23. Swift UVOT observations of GRB081024B
  24. Konus-Wind observation of GRB 081025
  25. GRB 081025: Swift-XRT position
  26. GRB 081024B: Swift-XRT observations
  27. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  28. Swift UVOT observations of GRB 081024
  29. GRB 081024: Swift-XRT refined analysis
  30. GRB 081024, Swift-BAT refined analysis
  31. GRB 081024: Faulkes Telescope North optical observations
  32. GRB 081024: KAIT Optical Limits
  33. GRB 081024: Early Super-LOTIS Observations
  34. GRB 081024A: ROTSE-III Optical Limits
  35. GRB 081022, Swift-BAT refined analysis
  36. GRB 081016A: Swift-XRT refined analysis
  37. GRB 081012: Swift-XRT Refined Analysis
  38. Swift trigger 332287 is not a GRB
  39. GRB 081017, Swift-BAT refined analysis
  40. GRB 081017: REM early observations
  41. GRB 081016B, Swift-BAT refined analysis
  42. GRB 081016B: Swift/UVOT Upper Limits
  43. GRB 081011: Swift XRT refined analysis
  44. GRB 081016B: Swift-XRT Team refined Analysis
  45. GRB 081016B: ROTSE-III Optical Limits
  46. GRB 081016: Swift-XRT candidate afterglow detection
  47. Detection of flare star Algol in Swift-BAT slew data
  48. GRB 081012: GROND upper limits
  49. GRB 081008: Galaxy associated with z=1.967 absorber
  50. GRB 081012: Fermi GBM detection
  51. GRB 081007 and GRB 081007B: Fermi GBM detection
  52. GRB 080430: optical observations
  53. GRB 081008 optical upper limit
  54. GRB 081012: Observations from NOT
  55. GRB 081012: Swift/UVOT analysis of initial observations
  56. GRB 081012: Swift/XRT detection
  57. GRB 081012, Swift-BAT refined analysis
  58. GRB 081012: ROTSE-III Optical Limits
  59. Revised table for GRB 081011 UVOT detections
  60. GRB081011: UVOT detection of an optical afterglow
  61. GRB 081011: Swift/XRT detection
  62. GRB 081011, Swift-BAT refined analysis
  63. GRB 081008, SMARTS optical/IR afterglow observations
  64. GRB 081007: Radio Detection
  65. Konus-Wind observation of GRB 081001
  66. GRB 081007: Rapid PROMPT Detections
  67. GRB 081008, Swift-BAT refined analysis
  68. GRB 081008: VLT redshift confirmation
  69. GRB 081008: Swift-XRT Refined Analysis
  70. GRB081008: Swift/UVOT observations
  71. GRB 081008: Gemini-South Absorption Redshiftt
  72. GRB 081008: VLT/FORS2 spectroscopy
  73. GRB 081008: ROTSE-III Detection of Optical Counterpart
  74. GRB081007: Swift/UVOT Observations
  75. GRB 081007, SMARTS optical afterglow observations
  76. GRB 081007, Swift-BAT refined analysis
  77. GRB 081007: Early RAPTOR measurements of optical counterpart
  78. GRB 081007: Swift-XRT Team refined analysis
  79. GRB 081007: Gemini-south redshift
  80. GRB 081007, Faulkes Telescope North optical observations
  81. GRB 081007, SMARTS optical/IR afterglow observations
  82. GRB 081007: REM NIR and optical counterpart
  83. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  84. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  85. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  86. GRB 081003B: Swift-XRT upper limit
  87. GRB 081003A: OSN optical observations
  88. GRB 081001: Further observations from OSN
  89. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  90. GRB 081003A: Swift-XRT Team position and analysis
  91. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  92. GRB 080928: Fermi GBM detection
  93. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  94. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  95. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  96. GRB 081001: Observations from OSN
  97. GRB 080925: Suzaku WAM observation of the prompt emission
  98. GRB 081001: Swift UVOT Observations
  99. GRB 081001: Swift-XRT position
  100. GRB081001: optical limit from ASH-Centurion

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