Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27046 results found.

  1. Konus-Wind and Konus-RF observations of GRB 090719
  2. Konus-RF and Konus-Wind observations of GRB 090718B
  3. Fermi Gamma-ray Burst Monitor triggers 269935914 through 270021937 are not GRBs
  4. Konus-Wind observations of bright hard GRB 090720B
  5. IPN Triangulation of bright GRB 090720B
  6. GRB 090720: Gemini-North Imaging and Optical Afterglow
  7. GRB 090720B: Fermi GBM detection
  8. GRB 090709A: Swift XRT Timing Analysis
  9. GRB 090720 Source found in ground processing of Swift-BAT data
  10. GRB 090717B: Fermi GBM detection
  11. GRB 090717: Fermi GBM detection
  12. GRB 090719: Fermi GBM detection
  13. GRB 090718B: Fermi GBM detection
  14. GRB 090718: Fermi GBM detection
  15. GRB 090720: Fermi GBM detection
  16. GRB 090715A: Suzaku WAM observation of the prompt emission
  17. GRB 090709A - CARMA mm Observations
  18. Konus-Wind observations of short/hard GRB 090715A
  19. GRB 090715B: MASTER optical limit
  20. GRB 090715A: Swift-BAT refined analysis
  21. GRB 090715B: Swift/UVOT followup observations
  22. GRB 090715B: break in the optical afterglow decay
  23. GRB 090715B: Swift XRT Refined Analysis
  24. GRB 090715B: Swift-BAT refined analysis
  25. GRB 090715B - Liverpool Telescope Optical Afterglow Candidate
  26. GRB 090715B: Swift detection of a burst with a possible optical counterpart
  27. GRB 090715A: ROTSE-III Optical Limits
  28. GRB 090715: Swift detection of a short hard burst
  29. GRB090713 optical limit by "Pi of the Sky"
  30. GRB 090712: Fermi GBM observation
  31. GRB 090713: Fermi GBM detection
  32. GRB 090712: Swift-BAT refined analysis
  33. GRB 090712: Swift detection of a burst
  34. GRB 090709A: Xinglong TNT optical upper limit
  35. GRB 090709A: Suzaku WAM observation of the prompt emission
  36. GRB 090709A: Swift UVOT upper limits
  37. GRB 090709B: Fermi GBM detection
  38. GRB 090709A: P60 Observations
  39. GRB 090709A: NOT optical observations
  40. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  41. GRB 090709A: Swift XRT Refined Analysis
  42. GRB 090709B, Swift-BAT refined analysis
  43. GRB 090709A: Swift-BAT refined analysis
  44. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  45. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  46. GRB 090709A, RIMOTS optical upper limits
  47. GRB 090709B: Swift detection of a burst
  48. GRB 090708 : Fermi GBM detection
  49. GRB 090626: Suzaku WAM observation of the prompt emission
  50. GRB 090709: PAIRITEL NIR Upper Limits
  51. GRB 090704: Fermi GBM observation
  52. GRB 090709: ROTSE-III Optical Limits
  53. GRB 090709: Swift detection of a bright burst
  54. GRB 090708: Early RAPTOR Optical Limits
  55. GRB 090708, Swift-BAT refined analysis
  56. GRB 090708: ROTSE-III Optical Limits
  57. GRB 090708: Swift detection of a burst
  58. GRB 090704: a long GRB found in INTEGRAL off-line analysis
  59. GRB 090706: Fermi GBM detection
  60. Swift-BAT trigger 356516 is not a GRB
  61. Possible GRB090705: Swift-XRT observations
  62. GRB 090705: PAIRITEL NIR Observations
  63. GRB 090705: Swift detection of a possible burst
  64. GRB 090703: Fermi GBM detection
  65. GRB 090702: UVOT upper limits
  66. XRF 090702: Swift-XRT afterglow position
  67. GRB 090701: Fermi GBM detection
  68. GRB 090628: Swift XRT refined analysis
  69. GRB 090630: Fermi GBM detection
  70. GRB 090628: Swift/UVOT Upper Limits
  71. Konus-Wind observation of GRB 090626
  72. GRB080628: SAO RAS optical observations
  73. GRB 090628: Swift-BAT refined analysis
  74. GRB 090628: GROND upper limits
  75. GRB 090626: IPN localization
  76. GRB 090628: Swift/UVOT Finding Chart Observation
  77. GRB 090628: Swift XRT position
  78. GRB 090628: Swift detection of a burst
  79. Fermi LAT observations of GRB 090626
  80. GRB 090625B: Fermi GBM observation
  81. GRB 090625B: Swift-XRT refined analysis
  82. GRB 090626: Fermi GBM detection
  83. GRB 090623: Suzaku WAM observation of the prompt emission
  84. GRB 090618: SARA Second Epoch Observations
  85. GRB 090625B: Faulkes Telescope South observations
  86. GRB 090625: Fermi GBM detection
  87. GRB 090617: Suzaku WAM observation of the prompt emission
  88. GRB 090618: Suzaku WAM observation of the prompt emission
  89. GRB 090623: Fermi GBM detection
  90. GRB 090621B: GRT Optical Observation
  91. GRB 090621A: GRT Optical Observation
  92. PAIRITEL observations of GRB 090618
  93. GRB 090621B: Fermi GBM detection
  94. GRB 090621D: Fermi GBM detection
  95. GRB 090621C: Fermi GBM detection
  96. GRB 090621: Fermi GBM observation
  97. GRB 090620: Fermi GBM detecion
  98. GRB 090621B: Swift/UVOT Upper Limits
  99. GRB 090621B: Swift-BAT refined analysis
  100. GRB 090621B: Swift-XRT 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