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"

28261 results found.

  1. GRB 101213A: Swift/UVOT Upper Limits
  2. GRB 101213A: Enhanced Swift-XRT position
  3. GRB 101213: object within the X-ray error circle
  4. GRB 101213A: Swift detection of a burst
  5. GRB101204A: Swift/UVOT observations
  6. GRB 101204A: Swift-XRT refined Analysis
  7. GRB101204A GROND Detection of the Optical/NIR Afterglow
  8. GRB 101204A Afterglow Candidate, VATT Observations
  9. GRB 101129A : Suzaku WAM observation of the prompt emission
  10. GRB 101204A Swift-XRT/UVOT afterglow candidate
  11. Konus-Wind observation of GRB 101130A
  12. GRB101030A
  13. GRB 101201A: Fermi GBM observation
  14. GRB 101201A: Swift-XRT refined Analysis
  15. GRB 101201A: Swift/UVOT Detection
  16. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  17. GRB 101123A: ROTSE optical observations
  18. GRB 101123A: MASTER prompt optical observations
  19. GRB 101123A: Fermi GBM detection
  20. GRB 101117B: GROND Upper limits
  21. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  22. GRB 101112A: OSN and BTA observations
  23. XRF 101117A: Palomar Transient Factory Observations
  24. GRB 101117B: Swift-XRT refined analysis
  25. GRB101114A: Swift/UVOT Upper Limits
  26. GRB 101117B: Swift-BAT refined analysis
  27. GRB 101117B: Enhanced Swift-XRT position
  28. GRB 101117B: Swift detection of a burst
  29. GRB 101114A: GROND Upper limits
  30. Konus-Wind observation of GRB 101114A
  31. Fermi GBM detection of a burst from a galactic source
  32. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  33. GRB 101114A, Swift-BAT GRB detected by ground processing
  34. GRB 101112A: Fermi GBM detection
  35. GRB 101112A: optical observations
  36. Konus-Wind observation of GRB 101112A
  37. GRB 101112A - XRT source detection/analysis
  38. GRB101112A: Liverpool Telescope Afterglow Candidate
  39. GRB 101112A: a long GRB detected by INTEGRAL
  40. GRB 090113, the review of the sky area in plate archives
  41. GRB 101030A : MOA optical observation
  42. GRB 101030A: GROND optical/NIR afterglow candidate
  43. GRB 101030A : Swift XRT refined analysis
  44. GRB 101030A: Swift/UVOT Upper Limits
  45. GRB 101030A: Swift-BAT refined analysis
  46. GRB 101030A: Enhanced Swift-XRT position
  47. GRB 101030A: Swift detection of a burst
  48. GRB 090111, the review of the sky area in plate archives (1976-1996)
  49. GRB 101024A: GROND optical/NIR observations
  50. GRB 101024A: Swift XRT refined analysis
  51. GRB 101024A: Zadko observatory - Gingin. Optical observations
  52. GRB 101024A: Fermi GBM observation
  53. GRB101024A: Swift/UVOT
  54. GRB 101024A: Swift-BAT refined analysis
  55. GRB 101024A: Enhanced Swift-XRT position
  56. Swift/UVOT observations of GRB101023A
  57. GRB 101024A: Swift detection of a burst with an optical afterglow
  58. GGRB 101023A: GROND detection of the optical-NIR afterglow
  59. GRB 101023A: Swift-XRT Team Refined Analysis
  60. GRB 101023A: Swift-BAT refined analysis
  61. GRB 101023A: Gemini discovery of optical afterglow
  62. GRB 101023A: Enhanced Swift-XRT position
  63. GRB 101023A: REM NIR observations
  64. GRB 101023A: Swift detection of a burst
  65. GRB 101020A, Swift-BAT refined analysis
  66. GRB 101017A: Swift XRT refined analysis
  67. GRB 101017A: Swift/UVOT Observations
  68. GRB 101008A: optical observations
  69. GRB101017A: MITSuME Okayama optical upper limits
  70. GRB 101017A: Enhanced Swift-XRT position
  71. GRB 101017A: Swift-BAT refined analysis
  72. GRB 101017A: Swift detection of a burst with optical counterpart
  73. GRB 101014A: Fermi GBM detection
  74. GRB 100906A: D50 optical detection
  75. GRB 100902A: D50 optical limit
  76. GRB 101011A: Swift/UVOT observations
  77. GRB 101011A, GROND upper limits
  78. GRB 101011A: Zadko observatory - Gingin optical observations
  79. GRB 101011A: XRT Refined Analysis
  80. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  81. GRB 101011A: Enhanced Swift-XRT position
  82. GRB 101011A: Swift-BAT refined analysis
  83. GRB 101011A: Swift detection of a burst
  84. GRB 101008A: Swift-BAT refined analysis
  85. GRB101008A, GROND detection of a fading afterglow
  86. GRB 101008A: Swift-XRT refined analysis
  87. GRB 101008A: SAO RAS optical observations
  88. GRB 100915 optical upper limit
  89. GRB 101008: Swift/UVOT Upper Limits
  90. GRB 101008A: Enhanced Swift-XRT position
  91. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  92. GRB 101008A: Swift detection of a burst
  93. Refined analysis shows Swift Trigger 435520 is not a GRB
  94. Swift Trigger 435520 is probably not a GRB
  95. GRB 100925A / MAXI J1659-152: MASTER optical observations
  96. GRB 100924A: Suzaku WAM observation of the prompt emission
  97. GRB 100928A, Swift-BAT refined analysis
  98. GRB 100924A: Fermi GBM observation
  99. GRB 100928A: Swift detection of a burst
  100. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical 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