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"

38116 results found.

  1. GRB 090117B : Fermi GBM detection
  2. GRB 090117: confirmation of the X-ray afterglow
  3. GRB 090117C - Fermi GRB Detection
  4. GRB 090117 - Fermi GBM Observations
  5. GRB 090117: GROND Upper Limits
  6. GRB090117 Swift/UVOT upper limits
  7. GRB090117: Swift-XRT detection of a possible candidate afterglow
  8. GRB 090117 - SuperAGILE Localization of a long GRB
  9. GRB 090112B: Suzaku WAM observation of the prompt emission
  10. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  11. GRB 090113: Swift UVOT upper limits
  12. GRB 090113: GROND Upper Limits
  13. GRB 090113: Swift-XRT refined analysis
  14. GRB 090113: Observations from NOT
  15. GRB 090113: Enhanced Swift-XRT position
  16. GRB 090113: Swift-BAT refined analysis
  17. GRB 090113: ROTSE-III Optical Limits
  18. GRB 090112B: Fermi GBM Detection
  19. GRB 090113: Swift detection of a burst
  20. GRB 090112: Fermi GBM detection
  21. GRB 090109: Fermi GBM detection
  22. GRB 090108B: Fermi GBM detection
  23. GRB 090111, Swift-BAT refined analysis
  24. GRB 090111: Swift UVOT Upper Limits
  25. GRB 090108: Fermi GBM Detection
  26. GRB 090111: Swift-XRT refined analysis
  27. GRB 090111: Enhanced Swift-XRT position
  28. GRB 090111: Swift detection of a burst
  29. GRB 090107B: Suzaku WAM observation of the prompt emission
  30. GRB090107B: Fermi GBM Detection
  31. GRB 090102: WSRT Radio Observations
  32. GRB 090107B: Swift XRT afterglow confirmation
  33. GRB 090107B: Swift/UVOT Observations
  34. GRB 090107B: Swift-XRT detection of possible afterglow
  35. GRB 090107B optical observations
  36. GRB 090107B: ROTSE-III Optical Limits
  37. GRB 090107B: a long GRB localized by INTEGRAL
  38. Fermi/GBM detection of GRB 081226A
  39. Fermi/GBM detection of GRB 081225
  40. GRB 090107: Swift-BAT refined analysis
  41. GRB 090107: Swift detection of a burst
  42. GRB 081231: Fermi GBM Detection
  43. GRB 090102: optical decay
  44. VLA radio upper limit on GRB 090102
  45. GRB 090102: GRT Optical Observation
  46. Konus-Wind observation of GRB 090102
  47. GRB 081229: Fermi GBM detection
  48. GRB 090102: Hobby-Eberly Telescope Spectroscopy
  49. GRB 090102: P60 Imaging and P200 Spectroscopy
  50. GRB 090102 Observations from IAC80
  51. GRB 090102: GROND observations of the optical afterglow
  52. Swift UVOT observations of GRB 090102
  53. GRB 090102: Swift-BAT refined analysis
  54. GRB 090102: Swift burst of interest
  55. GRB 090102: Swift XRT refined analysis
  56. GRB 090102: NOT redshift
  57. GRB 090102: Enhanced Swift-XRT position
  58. GRB 090102: TAROT Calern observatory optical light curve
  59. GRB 090102: REM observations of a bright afterglow
  60. GRB 090102: Swift detection of a burst with an optical counterpart
  61. GRB 090102: TAROT Calern observatory optical observations
  62. GRB 081230: GROND confirmation of the afterglow
  63. GRB 081230, Swift-BAT refined analysis
  64. GRB081230: Swift-XRT refined analysis
  65. GRB 081230 Swift/UVOT Observations
  66. GRB 081230: Enhanced Swift-XRT position
  67. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  68. GRB 081230: ROTSE-III Detection of Optical Counterpart
  69. GRB 081230: Swift detection of a burst
  70. GRB 081228: GROND confirmation of the optical/NIR afterglow
  71. GRB 081226B: Fermi GBM observation
  72. GRB 081226C: Fermi GBM detection
  73. GRB 081228, Swift-BAT refined analysis
  74. VLA radio detection of GRB 081221
  75. GRB 081228: Swift/UVOT Upper Limits
  76. GRB 081228: Swift-XRT Team refined analysis
  77. GRB 081228: detection by GROND
  78. GRB 081228: Enhanced Swift-XRT position
  79. GRB 081228: TAROT Calern observatory optical observations
  80. GRB 081228: Swift detection of a burst
  81. VLA radio observation of GRB 081221
  82. GRB 081226B: Swift XRT and UVOT upper limits
  83. GRB 081224: Suzaku WAM observation of the prompt emission
  84. GRB 081226: Swift-XRT refined analysis
  85. GRB 081226A: Swift UVOT Upper Limits
  86. GRB 081226: Second epoch of Gemini-South imaging
  87. GRB 081226A: Swift-BAT refined analysis
  88. GRB 081226B: a short-hard GRB detected by INTEGRAL
  89. GRB 081226: Gemini-South spectrum of possible afterglow
  90. GRB 081226: Gemini-South imaging
  91. GRB 081226: GROND afterglow candidate
  92. GRB 081226: ROTSE-III Optical Limits
  93. GRB 081226: Swift detection of a possible short-hard burst
  94. GRB 080810: optical observations
  95. GRB 081211B: optical observations
  96. GRB081224: LAT retraction
  97. GRB 081224: Swift-XRT observation
  98. GRB 081222: MITSuME optical observation
  99. GRB 081224: Fermi GBM Detection & LAT Localization
  100. GRB 080810: optical observations

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