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"

29122 results found.

  1. Swift-BAT triggered on the flare star Algol
  2. GRB 081012: Fermi GBM detection
  3. GRB 081007 and GRB 081007B: Fermi GBM detection
  4. GRB 081012: Swift/UVOT analysis of initial observations
  5. GRB 081012: Swift/XRT detection
  6. GRB 081012, Swift-BAT refined analysis
  7. GRB 081012: ROTSE-III Optical Limits
  8. GRB 081012: Swift detection of a burst
  9. GRB081011: UVOT detection of an optical afterglow
  10. GRB 081011: Swift/XRT detection
  11. GRB 081011, Swift-BAT refined analysis
  12. GRB 081011: Swift detection of a burst
  13. GRB 081007: Rapid PROMPT Detections
  14. GRB 081008, Swift-BAT refined analysis
  15. GRB 081008: Swift-XRT Refined Analysis
  16. GRB081008: Swift/UVOT observations
  17. GRB 081008: Swift detection of a burst with optical afterglow
  18. GRB 081008: ROTSE-III Detection of Optical Counterpart
  19. GRB081006B: Fermi GBM detection
  20. GRB081006: Fermi GBM detection
  21. GRB081007: Swift/UVOT Observations
  22. GRB 081007, Swift-BAT refined analysis
  23. GRB 081007: Early RAPTOR measurements of optical counterpart
  24. GRB 081007: Swift-XRT Team refined analysis
  25. GRB 081007: Swift detection of a burst with optical afterglow
  26. GRB081003C: GLAST Burst Monitor detection
  27. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  28. GRB 081003B: TAROT Calern observatory optical observations
  29. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  30. GRB 081003B: Swift-XRT upper limit
  31. GRB 081003A: OSN optical observations
  32. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  33. GRB 081003A: Swift-XRT Team position and analysis
  34. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  35. GRB 080928: Fermi GBM detection
  36. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  37. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  38. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  39. Trigger 330353: Swift detection of a Galactic short soft burst
  40. GRB 080925: Suzaku WAM observation of the prompt emission
  41. GRB 081001: Swift-XRT position
  42. GRB081001: optical limit from ASH-Centurion
  43. GRB 080928: Watcher observations
  44. GRB 080927: Fermi GBM detection
  45. GRB 080928: VLT redshift
  46. GRB 080928: Swift/UVOT observations
  47. GRB 080928, Swift-BAT final refined analysis
  48. GRB 080928: GROND DETECTION
  49. GRB 080928, Swift-BAT initial refined analysis
  50. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  51. GRB 080928: Swift detection of a burst with an optical counterpart
  52. GRB 080925: Fermi GBM Detection
  53. GRB 080920: Fermi GBM detection
  54. GRB080922, optical upper limit
  55. Swift-BAT trigger 325707 is not a GRB
  56. Swift trigger 325707: Swift/UVOT Upper Limits
  57. Swift trigger 325707: Swift-XRT upper limit
  58. Swift detection of a possible GRB (trigger 325707)
  59. GRB080916A: Suzaku WAM observation of the prompt emission
  60. GRB080922: Swift-XRT upper limit
  61. GRB 080913B: Fermi GBM detection
  62. Trigger 324561: IGR J08408-4503 detected by Swift
  63. GRB 080916C: Fermi GBM Spectral Analysis
  64. GRB 080919: Swift/UVOT Refined Analysis
  65. GRB 080919: Swift-XRT refined analysis
  66. GRB 080919, Swift-BAT refined analysis
  67. GRB 080916C: IRSF/SIRUS NIR Observation
  68. GRB 080916C: GROND Confirmation of the Optical Afterglow
  69. GRB 080916C: GROND Confirmation of the Optical Afterglow
  70. GRB 080919: Swift detection of a short burst
  71. Fermi/GBM Data Now Available
  72. GRB 080915A: GROND upper limits
  73. GRB 080916A: GROND lightcurve
  74. GRB 080916A: Rapid PROMPT Observations
  75. GRB 080916A: Fermi GBM detection
  76. GRB 080916C: Swift UVOT Refined Analysis
  77. GRB 080916C: Swift XRT refined analysis
  78. GRB 080916B: Swift-XRT refined analysis
  79. Konus-Wind observation of GRB 080916A
  80. Konus-Wind observation of GRB 080916C
  81. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  82. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  83. GRB 080916C: Swift/XRT detection of possible afterglow
  84. GRB 080916B: Swift UVOT Refined Analysis
  85. GRB 080916B, Swift-BAT refined analysis
  86. GRB080916A: Refined Swift/UVOT Observations
  87. GRB 080916C: Fermi LAT observation
  88. GRB 080916C: Fermi GBM Detection
  89. GRB 080916A, Swift-BAT refined analysis
  90. GRB 080916B: Swift-XRT afterglow detection
  91. GRB 080916B: Swift detection of a burst
  92. GRB 080916: Swift detection of a burst with optical afterglow
  93. GRB 080915B, Swift-BAT refined analysis
  94. GRB 080912 : Fermi GBM detection
  95. GRB 080915B: Swift detection of a burst
  96. GRB 080915: Swift/UVOT Upper Limits
  97. GRB 080915: Swift-XRT afterglow detection and analysis
  98. GRB 080915, Swift-BAT refined analysis
  99. GRB 080915: ROTSE-III Optical Limits
  100. GRB 080915: Swift detection of a burst

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