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"

5184 results found.

  1. GRB 130615A: Swift-XRT refined Analysis
  2. GRB 130612A: Swift-XRT refined Analysis
  3. IPN Triangulation of GRB 130610B (long/multipeaked)
  4. GRB 130610A: Swift-XRT refined Analysis
  5. GRB 130609B: Swift-XRT refined Analysis
  6. GRB 130606A - Liverpool Telescope and Faulkes Telescope North optical observations
  7. GRB 130608A: Swift-XRT refined Analysis
  8. GRB 130609A: Swift-XRT refined Analysis
  9. Swift Trigger 557674 was due to an onboard position error
  10. Swift Trigger 557674 is a probable new Galactic transient
  11. GRB 130606A: Swift-XRT refined Analysis
  12. GRB 130606A: AAO optical observations
  13. GRB 130605A: Swift-XRT refined Analysis
  14. GRB 130604A: Swift-XRT refined Analysis
  15. GRB 130603B: Swift-XRT refined Analysis
  16. GRB 130603A: Swift-XRT refined Analysis
  17. GRB 130518A: Suzaku WAM observation of the prompt emission
  18. GRB 130529A: Swift-XRT refined Analysis
  19. GRB 130528A: Swift-XRT refined Analysis
  20. GRB 130527A: Swift-XRT refined Analysis
  21. GRB 130527A: Prompt enhanced Swift-XRT position
  22. GRB 130521B: Suzaku WAM observation of the prompt emission
  23. Konus-Wind observation of GRB 130521B
  24. IPN Triangulation of GRB 130521B
  25. GRB 130518A: P60 Afterglow Observations
  26. GRB 130515A: Swift-XRT refined Analysis
  27. GRB 130514A: Swift-XRT refined Analysis
  28. GRB 130514A: Skynet/PROMPT/DSO Detections
  29. GRB 130427A: optical observations
  30. GRB 130513A: Swift-XRT detection of the afterglow.
  31. GRB 130511A: Swift-XRT refined Analysis
  32. GRB 130508A: Refined Swift-XRT analysis: Correction to GCN 14612
  33. GRB 130504B: Suzaku WAM observation of the prompt emission
  34. GRB 130505A: Swift-XRT refined Analysis
  35. GRB 130505A: Swift detection of a burst with optical afterglow
  36. GRB 130504A: MITSuME Okayama upper limits
  37. GRB 130502B: Suzaku WAM observation of the prompt emission
  38. Swift-XRT X-ray afterglow candidate for GRB 130504A (BAT trigger 555096)
  39. GRB 130502B: Fermi GBM detection of a burst
  40. GRB 130427B: MITSuME Ishigakijima upper limits
  41. GRB 130427A: Nishi-Harima NIR Observations
  42. GRB 130427A: Swift-XRT refined Analysis
  43. GRB 130427B: Swift-XRT refined Analysis
  44. IPN Triangulation of GRB 130425A
  45. GRB 130420B: Swift-XRT refined Analysis
  46. GRB 130420A: Swift-XRT refined Analysis
  47. GRB 130420B: MASTER-Net optical observations
  48. GRB 130418A: SMARTS optical/IR afterglow observations
  49. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  50. Trigger 553930: Swift detection of a possible flare from HR 5110
  51. GRB 130408A: SMARTS optical/IR afterglow observations
  52. GRB 130408A: Swift-XRT refined Analysis
  53. GRB 130327B: Suzaku WAM observation of the prompt emission
  54. Konus-Wind observation of GRB 130320B
  55. IPN Triangulation of GRB 130320B (very long/bright)
  56. Swift/XRT observation of GRB 130327B
  57. GRB 130310A: RATIR Observations
  58. Konus-Wind observation of GRB 130327B
  59. GRB 130327B: Fermi-LAT detection of a burst
  60. GRB 130327B: Fermi GBM detection
  61. GRB 130327B: gamma-ray detection by AGILE
  62. GRB 130327A: Swift-XRT refined Analysis
  63. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  64. GRB 130219A: Suzaku WAM observation of the prompt emission
  65. Trigger 549841: Swift detection of SGR1806-20
  66. IPN Triangulation of GRB 130219A
  67. GRB 130216A: Swift detection of a burst
  68. GRB 130211A: Swift-XRT refined Analysis
  69. GRB 130131A: optical observation in Mondy observatory
  70. GRB 130131B: Swift-XRT refined Analysis
  71. GRB 130131A: VLA 5.8 Ghz Detection
  72. GRB 130131A: Swift-XRT refined Analysis
  73. GRB 130131A - UKIRT afterglow candidate
  74. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  75. Swift Trigger 547142: MAXI/GSC upper limit
  76. GRB 130122A: Swift-XRT refined Analysis
  77. Short GRB 121226A: TNG observation of the host galaxy
  78. GRB 130102A: Swift-XRT refined Analysis
  79. GRB 121226A: 5.8 GHz VLA observations
  80. GRB 121229A: Swift-XRT refined Analysis
  81. GRB 121226A: 10.4m GTC optical observations
  82. GRB 121226A: Swift-XRT refined Analysis
  83. GRB 121226A, Swift-BAT refined analysis
  84. GRB 121226A: BOOTES-4/MET optical observations
  85. GRB 121226A: Swift detection of a burst
  86. GRB 121225A: MAXI/GSC detection
  87. GRB 121217A: Swift-XRT refined Analysis
  88. GRB 121123A: NIKA (New IRAM KID Arrays) millimetre observations at the 30-m Pico Veleta telescope
  89. GRB 121211A: Continued RATIR Optical and NIR Observations, Fading
  90. GRB 121212A: Swift-XRT refined Analysis
  91. GRB 121211A: Swift-XRT refined Analysis
  92. GRB 121209A: Swift-XRT refined Analysis
  93. GRB 121209A: GROND optical afterglow candidate
  94. GRB 121202A: Swift-XRT refined Analysis
  95. GRB 121201A: Swift-XRT refined Analysis
  96. IPN Triangulation of GRB 121127A (short/hard)
  97. GRB 121128A: Swift-XRT refined Analysis
  98. GRB 121125A: Swift-XRT refined Analysis
  99. GRB 121125A: Fermi GBM Observation
  100. GRB 121125A: LOAO 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