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"

27650 results found.

  1. GRB 120403B: Fermi GBM Observation
  2. GRB 120404A: Gemini-N Redshift
  3. GRB 120403B: AAT nIR observations
  4. GRB 120404A: MITSuME Akeno Optical upper limits
  5. GRB 120404A: Faulkes Telescope North afterglow confirmation
  6. GRB 120404A: Swift detection of a burst with an optical counterpart
  7. GRB 120403B: Swift-BAT refined analysis
  8. GRB 120403B: Swift/UVOT Upper Limits
  9. GRB 120403A: Swift/BAT spectral lag analysis
  10. GRB 120403B: Swift detection of a burst
  11. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  12. GRB 120402A: optical upper limit
  13. GRB 120320A: early optical upper limit
  14. GRB 120403A, Swift-BAT refined analysis
  15. GRB 120402B: Fermi GBM detection
  16. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  17. GRB 120403A: Swift detection of a burst
  18. GRB 120402A: Swift detection of a possible burst or noise
  19. GRB 120326A: Cima Rest and Bassano Brescia
  20. GRB 120401A: Swift-XRT refined Analysis
  21. GRB 120401A: Swift-BAT refined analysis
  22. GRB 120401A: Swift detection of a burst
  23. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  24. GRB 120326A : Suzaku WAM observation of the prompt emission
  25. GRB 120326A: CARMA 3mm detection
  26. Swift trigger 518853 is most likely GX 301-2
  27. GRB 120326A: Bassano Bresciano Observatory optical observations
  28. Swift trigger 518853: MASTER-ICATE possible OT
  29. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  30. Trigger 518853: Swift detection of a probable Galactic transient
  31. GRB 120328B: Fermi-LAT Observations
  32. GRB 120327A: Zadko optical observations
  33. GRB 120328B: Fermi GBM detection
  34. GRB 120328A: Swift/UVOT Upper Limits
  35. GRB 120328A: Swift-XRT refined Analysis
  36. IPN Triangulation of GRB 120328B (long/intense)
  37. GRB 120328A: Swift-BAT refined analysis
  38. GRB 120328A: TAROT La Silla observatory optical observations
  39. Skynet/PROMPT observations of GRB120328A
  40. GRB 120328A: Swift detection of a burst
  41. GRB 120326A: Fermi GBM Observation
  42. GRB 120327A afterglow detection
  43. GRB 120326A: PAIRITEL NIR Observations
  44. GRB 120326A: Bassano Bresciano Observatory optical observations
  45. GRB 120327A: Swift-XRT refined Analysis
  46. GRB 120327A: CQUEAN grizY Observation
  47. GRB 120327A: Swift/UVOT further analysis
  48. GRB 120327A: Swift-BAT refined analysis
  49. GRB 120327A: X-shooter redshift
  50. GRB 120327A: Gemini-South redshift
  51. GRB 120327A: TAROT La Silla observatory optical decay
  52. GROND observations of GRB 120327A
  53. GRB 120327A: Liverpool Telescope Observations
  54. GRB 120327A: TAROT La Silla observatory optical detection
  55. GRB 120327A: Swift detection of a burst with an optical counterpart
  56. GRB 120326A: Swift-BAT refined analysis
  57. GRB 120326A: T17 optical observations
  58. GRB 120326A: CQUEAN grizY Observation
  59. GRB 120326A: Swift-XRT refined Analysis
  60. GRB 120326A: Swift/UVOT Detection
  61. GRB 120326A: Liverpool Telescope observations
  62. Skynet/Dolomiti Observations of GRB120326A
  63. GRB 120326A: TAROT Calern observatory afterglow optical detection
  64. GRB 120326A: ROTSE-III Optical Limits
  65. GRB 120326A: Swift detection of a burst
  66. GRB 120323A: Fermi LAT observations
  67. IPN Triangulation of GRB 120323A (short/very intense)
  68. GRB 120324A: Swift-XRT refined Analysis
  69. Konus-Wind observation of GRB 120324A
  70. GRB 120323A: Fermi GBM detection
  71. GRB 120324A: GROND observations
  72. GRB 120324A: CQUEAN rizY Observation
  73. GRB 120324A: Swift-BAT refined analysis
  74. GRB 120324A: Swift/UVOT Upper Limits
  75. GRB 120324A: TAROT La Silla observatory optical observations
  76. GRB 120324A: Liverpool Telescope optical candidate
  77. GRB 120324A: UVOT Finding Chart Observation
  78. GRB 120324A: Swift detection of a burst
  79. GRB 120316A : Suzaku WAM observation of the prompt emission
  80. GRB 120320A: Zadko optical observations
  81. GRB 120316A: Fermi-GBM and Fermi-LAT Observations
  82. GRB 120229A: Magellan observations and limit on an optical afterglow
  83. GRB 120320A: Swift/UVOT Upper Limits
  84. GRB 120320A , optical observations
  85. GRB 120320A: BOOTES-4 optical upper limit
  86. GRB 120320A: Swift-XRT refined Analysis
  87. GRB 120320A, Swift-BAT refined analysis
  88. Fermi GBM trigger 120319.237 is not a GRB
  89. Konus-Wind observation of GRB 120316A
  90. IPN Triangulation of GRB 120316A
  91. GRB 120320A: MASTER optical observations
  92. GRB 120320A: Swift detection of a burst
  93. GBM trigger 353549464 (GRB 120316A?) : High-energy photon emission in Fermi/LAT data
  94. Trigger 517876 is a Swift detection of GX 5-1
  95. Fermi GBM triggers 120309.265 and 120309.402 are not GRBs
  96. GRB 120311A: Optical follow-up
  97. GRB 120311A: C88 optical limits
  98. GRB 120312A: Swift/UVOT Upper Limits
  99. GRB 120312A: Swift-XRT refined Analysis
  100. GRB 120312A: Swift-BAT 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