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"

28249 results found.

  1. GRB 101201A: Fermi GBM observation
  2. GRB 101201A: Swift-XRT refined Analysis
  3. GRB 101201A: Swift/UVOT Detection
  4. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  5. GRB 101123A: ROTSE optical observations
  6. GRB 101123A: MASTER prompt optical observations
  7. GRB 101123A: Fermi GBM detection
  8. GRB 101117B: GROND Upper limits
  9. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  10. GRB 101112A: OSN and BTA observations
  11. XRF 101117A: Palomar Transient Factory Observations
  12. GRB 101117B: Swift-XRT refined analysis
  13. GRB101114A: Swift/UVOT Upper Limits
  14. GRB 101117B: Swift-BAT refined analysis
  15. GRB 101117B: Enhanced Swift-XRT position
  16. GRB 101117B: Swift detection of a burst
  17. GRB 101114A: GROND Upper limits
  18. Konus-Wind observation of GRB 101114A
  19. Fermi GBM detection of a burst from a galactic source
  20. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  21. GRB 101114A, Swift-BAT GRB detected by ground processing
  22. GRB 101112A: Fermi GBM detection
  23. GRB 101112A: optical observations
  24. Konus-Wind observation of GRB 101112A
  25. GRB 101112A - XRT source detection/analysis
  26. GRB101112A: Liverpool Telescope Afterglow Candidate
  27. GRB 101112A: a long GRB detected by INTEGRAL
  28. GRB 090113, the review of the sky area in plate archives
  29. GRB 101030A : MOA optical observation
  30. GRB 101030A: GROND optical/NIR afterglow candidate
  31. GRB 101030A : Swift XRT refined analysis
  32. GRB 101030A: Swift/UVOT Upper Limits
  33. GRB 101030A: Swift-BAT refined analysis
  34. GRB 101030A: Enhanced Swift-XRT position
  35. GRB 101030A: Swift detection of a burst
  36. GRB 090111, the review of the sky area in plate archives (1976-1996)
  37. GRB 101024A: GROND optical/NIR observations
  38. GRB 101024A: Swift XRT refined analysis
  39. GRB 101024A: Zadko observatory - Gingin. Optical observations
  40. GRB 101024A: Fermi GBM observation
  41. GRB101024A: Swift/UVOT
  42. GRB 101024A: Swift-BAT refined analysis
  43. GRB 101024A: Enhanced Swift-XRT position
  44. Swift/UVOT observations of GRB101023A
  45. GRB 101024A: Swift detection of a burst with an optical afterglow
  46. GGRB 101023A: GROND detection of the optical-NIR afterglow
  47. GRB 101023A: Swift-XRT Team Refined Analysis
  48. GRB 101023A: Swift-BAT refined analysis
  49. GRB 101023A: Gemini discovery of optical afterglow
  50. GRB 101023A: Enhanced Swift-XRT position
  51. GRB 101023A: REM NIR observations
  52. GRB 101023A: Swift detection of a burst
  53. GRB 101020A, Swift-BAT refined analysis
  54. GRB 101017A: Swift XRT refined analysis
  55. GRB 101017A: Swift/UVOT Observations
  56. GRB 101008A: optical observations
  57. GRB101017A: MITSuME Okayama optical upper limits
  58. GRB 101017A: Enhanced Swift-XRT position
  59. GRB 101017A: Swift-BAT refined analysis
  60. GRB 101017A: Swift detection of a burst with optical counterpart
  61. GRB 101014A: Fermi GBM detection
  62. GRB 100906A: D50 optical detection
  63. GRB 100902A: D50 optical limit
  64. GRB 101011A: Swift/UVOT observations
  65. GRB 101011A, GROND upper limits
  66. GRB 101011A: Zadko observatory - Gingin optical observations
  67. GRB 101011A: XRT Refined Analysis
  68. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  69. GRB 101011A: Enhanced Swift-XRT position
  70. GRB 101011A: Swift-BAT refined analysis
  71. GRB 101011A: Swift detection of a burst
  72. GRB 101008A: Swift-BAT refined analysis
  73. GRB101008A, GROND detection of a fading afterglow
  74. GRB 101008A: Swift-XRT refined analysis
  75. GRB 101008A: SAO RAS optical observations
  76. GRB 100915 optical upper limit
  77. GRB 101008: Swift/UVOT Upper Limits
  78. GRB 101008A: Enhanced Swift-XRT position
  79. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  80. GRB 101008A: Swift detection of a burst
  81. Refined analysis shows Swift Trigger 435520 is not a GRB
  82. Swift Trigger 435520 is probably not a GRB
  83. GRB 100925A / MAXI J1659-152: MASTER optical observations
  84. GRB 100924A: Suzaku WAM observation of the prompt emission
  85. GRB 100928A, Swift-BAT refined analysis
  86. GRB 100924A: Fermi GBM observation
  87. GRB 100928A: Swift detection of a burst
  88. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  89. GRB 100925A / MAXI J1659-152: SARA-S Observations
  90. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  91. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  92. GRB 100925A/MAXI J1659-152 - NOT optical observations
  93. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  94. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  95. GRB100925A UVOT afterglow
  96. GRB 100924A: GROND detection of an optical/NIR afterglow
  97. GRB 100925A: Swift detection of a burst
  98. GRB 100924A: Swift-BAT refined analysis
  99. GRB 100917A: TAROT La Silla observatory optical observations
  100. GRB 100915A: TAROT Calern observatory 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