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"

27481 results found.

  1. GRB 081008: ROTSE-III Detection of Optical Counterpart
  2. GRB081006B: Fermi GBM detection
  3. GRB081006: Fermi GBM detection
  4. GRB081007: Swift/UVOT Observations
  5. GRB 081007, Swift-BAT refined analysis
  6. GRB 081007: Early RAPTOR measurements of optical counterpart
  7. GRB 081007: Swift-XRT Team refined analysis
  8. GRB 081007: Swift detection of a burst with optical afterglow
  9. GRB081003C: GLAST Burst Monitor detection
  10. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  11. GRB 081003B: TAROT Calern observatory optical observations
  12. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  13. GRB 081003B: Swift-XRT upper limit
  14. GRB 081003A: OSN optical observations
  15. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  16. GRB 081003A: Swift-XRT Team position and analysis
  17. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  18. GRB 080928: Fermi GBM detection
  19. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  20. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  21. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  22. Trigger 330353: Swift detection of a Galactic short soft burst
  23. GRB 081001: Swift-XRT position
  24. GRB081001: optical limit from ASH-Centurion
  25. GRB 080928: Watcher observations
  26. GRB 080927: Fermi GBM detection
  27. GRB 080928: VLT redshift
  28. GRB 080928: Swift-XRT refined analysis
  29. GRB 080928: Swift/UVOT observations
  30. GRB 080928, Swift-BAT final refined analysis
  31. GRB 080928: GROND DETECTION
  32. GRB 080928, Swift-BAT initial refined analysis
  33. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  34. GRB 080928: Swift detection of a burst with an optical counterpart
  35. GRB 080925: Fermi GBM Detection
  36. GRB 080920: Fermi GBM detection
  37. GRB080922, optical upper limit
  38. Swift-BAT trigger 325707 is not a GRB
  39. Swift trigger 325707: Swift/UVOT Upper Limits
  40. Swift trigger 325707: Swift-XRT upper limit
  41. Swift detection of a possible GRB (trigger 325707)
  42. GRB080916A: Suzaku WAM observation of the prompt emission
  43. GRB080922: Swift-XRT upper limit
  44. GRB 080913B: Fermi GBM detection
  45. Trigger 324561: IGR J08408-4503 detected by Swift
  46. GRB 080919: Swift/UVOT Refined Analysis
  47. GRB 080919: Swift-XRT refined analysis
  48. GRB 080919, Swift-BAT refined analysis
  49. GRB 080916C: GROND Confirmation of the Optical Afterglow
  50. GRB 080916C: GROND Confirmation of the Optical Afterglow
  51. GRB 080919: Swift detection of a short burst
  52. GRB 080915A: GROND upper limits
  53. GRB080913: Swift-BAT spectral lag
  54. GRB 080916A: GROND lightcurve
  55. GRB 080916A: Rapid PROMPT Observations
  56. GRB 080916A: Fermi GBM detection
  57. GRB 080916C: Swift XRT refined analysis
  58. GRB 080916B: Swift-XRT refined analysis
  59. Konus-Wind observation of GRB 080916A
  60. Konus-Wind observation of GRB 080916C
  61. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  62. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  63. GRB 080916B: Swift UVOT Refined Analysis
  64. GRB 080916B, Swift-BAT refined analysis
  65. GRB080916A: Refined Swift/UVOT Observations
  66. GRB 080916C: Fermi LAT observation
  67. GRB 080916C: Fermi GBM Detection
  68. GRB 080916A, Swift-BAT refined analysis
  69. GRB 080916B: Swift-XRT afterglow detection
  70. GRB 080916B: Swift detection of a burst
  71. GRB 080916: Swift detection of a burst with optical afterglow
  72. GRB 080915B, Swift-BAT refined analysis
  73. GRB 080912 : Fermi GBM detection
  74. GRB 080915B: Swift detection of a burst
  75. GRB 080915: Swift/UVOT Upper Limits
  76. GRB 080915: Swift-XRT afterglow detection and analysis
  77. GRB 080915, Swift-BAT refined analysis
  78. GRB 080915: ROTSE-III Optical Limits
  79. GRB 080915: Swift detection of a burst
  80. GRB 080913: Swift-XRT refined analysis
  81. GRB080913: Swift/UVOT Upper Limits
  82. GRB 080913, Swift-BAT refined analysis
  83. GRB 080913: VLT/FORS2 observations
  84. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  85. GRB 080913: Swift detection of a burst
  86. GRB 080906: Watcher observations
  87. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  88. GRB 080906B: Fermi GBM detection
  89. GRB 080905C: Fermi GBM detection
  90. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  91. Swift trigger 324362 (LS I +61 303 ?): XRT
  92. Swift trigger 324362 (LS I +61 303 ?)
  93. GRB080905A: Swift/UVOT Upper Limits
  94. GRB 080905B: Watcher optical detection
  95. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  96. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  97. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  98. GRB 080905A: MITSuME Akeno optical upper limits
  99. Swift Trigger 324122 is again known source Swift J1842.5-1124
  100. Swift Trigger 324116 is known source again

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