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"

37330 results found.

  1. GRB 120816A: Swift-XRT refined Analysis
  2. GRB 120817A: Swift-XRT observations
  3. GRB 120817A: Swift detection of a burst
  4. GRB 120816A: Enhanced Swift-XRT position
  5. GRB 120816A: Swift-BAT refined analysis
  6. GRB 120816A: BOOTES-2 observations
  7. GRB120816A: OPTIMA discovery of optical counterpart
  8. GRB 120816A: TAROT Calern observatory optical observations
  9. GRB 120816A: ROTSE-III Optical Limits
  10. GRB 120816A: Swift detection of a burst
  11. GRB 120815A: Swift-XRT refined Analysis
  12. GRB 120815A: Swift-BAT refined analysis
  13. GRB 120805A: Liverpool Telescope optical candidate detection
  14. GRB 120815A: Enhanced Swift-XRT position
  15. GRB 120815A: VLT/X-shooter redshift
  16. GRB 120815A: GROND afterglow candidate
  17. GRB 120815A: Swift-XRT observations
  18. GRB 120815A: TAROT La Silla observatory optical observations
  19. GRB 120815A: Swift detection of a burst
  20. GRB 120811B: Fermi GBM observation
  21. GRB 120804A: Possible temporal break in the X-ray light-curve
  22. GCN for GRB 120811C
  23. GRB 120811A: Swift/XRT-UVOT Obseravations
  24. GRB120804A: Chandra observations and afterglow detection
  25. GRB 120805A: optical afterglow confirmation from the NOT
  26. GRB 120805A: Enhanced Swift-XRT position
  27. GRB 120811C: EVLA Observations
  28. GRB 120811C: RTT150 optical observations
  29. GRB 120811C: MASTER-Tunka OT observations
  30. GRB 120811C: Swift-BAT refined analysis
  31. GRB 120811A: Swift-BAT refined analysis
  32. GRB 120811C: NOT redshift
  33. GRB 120811C: Bassano Bresciano Observatory optical observations
  34. GRB 120811C: Swift-XRT refined Analysis
  35. GRB 120811C: Swift/UVOT Detection
  36. GRB 120811C: Redshift from OSIRIS/GTC
  37. Improved IPN error box for short hard GRB 120811B
  38. GRB 120811C: RTT150 optical observations
  39. GRB 120811C: Enhanced Swift-XRT position
  40. GRB 120811C: TAROT Calern observatory optical observations
  41. GRB 120811C: MASTER-Amur observations of fading OT
  42. GRB 120811C: Swift detection of a burst with an optical counterpart
  43. Konus-Wind observation of GRB 120811B
  44. IPN Triangulation of short hard GRB 120811B
  45. Swift Trigger 530581: GRB 120811A or a galactic transient
  46. GRB 120803A: optical upper limit
  47. GRB 120807A: Swift/UVOT Upper Limits
  48. GRB 120803A: Confirmation of the X-ray afterglow
  49. GRB 120804A: Konus-Wind and Swift/BAT joint spectral analysis
  50. GRB 120714B: GROND/FORS2 detection of a supernova
  51. GRB 120804A: ATCA 34GHz upper limit
  52. GRB 120807A: Swift-XRT refined Analysis
  53. GRB 120802A: optical observations
  54. GRB 120807A: Fermi/LAT upper limit
  55. GRB 120807A: RAPTOR Limits During Gamma-Ray Emitting Interval
  56. GRB 120804A: Gemini-North detection of an optical afterglow and putative host galaxy
  57. GRB 120807A: TAROT La Silla observatory optical observations
  58. GRB 120807A: Swift-BAT refined analysis
  59. GRB 120807A: Enhanced Swift-XRT position
  60. GRB 120807A: Swift detection of a burst
  61. GRB 120804A: ATCA 34GHz upper limit
  62. Fermi/GBM detection of an SGR-like burst
  63. Swift-BAT trigger 530214 is noise
  64. GRB 120805A: Swift/UVOT Upper Limits
  65. GRB 120728A: Fermi GBM observation
  66. GRB 120805A: Swift-BAT refined analysis
  67. GRB 120802A: Swift/UVOT Upper Limits
  68. GRB 120805A: Swift-XRT refined Analysis
  69. GRB 120805A: 1.23m CAHA observations
  70. GRB120805A: Liverpool Telescope observations
  71. GRB 120805A: TAROT Calern observatory optical observations
  72. GRB 120805A: Swift detection of a burst
  73. GRB 120804A: EVLA Detection
  74. GRB 120804A: Gemini-North observations
  75. GRB 120804A: Swift-BAT Spectral lag analysis
  76. GRB 120804A: MITSuME Okayama Optical upper limits
  77. GRB 120803B: Swift-XRT refined Analysis
  78. GRB 120804A: Swift/UVOT Upper Limits
  79. GRB 120804A: Swift-BAT refined analysis
  80. GRB 120804A: Swift-XRT refined Analysis
  81. GRB 120804A: GROND upper limits
  82. GRB 120802A: EVLA Observations
  83. GRB 120804A: Enhanced Swift-XRT position
  84. Erratum of subject line of GCN13570 (GRB 120803A => GRB 120803B)
  85. GRB 120803B: MITSuME Okayama Optical upper limits
  86. GRB 120803A: MITSuME Okayama Optical upper limits
  87. GRB 120804A: Swift detection of a short burst
  88. GRB 120803B: Swift-BAT refined analysis
  89. GRB 120803B: Enhanced Swift-XRT position
  90. GRB 120803B: MITSuME Akeno Optical upper limits
  91. GRB 120803A: Swift-XRT Observations
  92. GRB 120803A: Swift-BAT refined analysis
  93. GRB 120803B: FTN possible afterglow candidate
  94. GRB 120803B: Swift detection of a burst
  95. GRB 120803A: Swift detection of a possible burst
  96. GRB 120802A: GRT Optical Observation
  97. GRB 120802A: Swift-XRT refined Analysis
  98. GRB 120802A Gemini-N redshift
  99. GRB 120802A: APEX/LABOCA submm observations
  100. GRB 120729A: Fermi GBM observation

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