Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

36423 results found.

  1. GRB 130325A Tiled Swift observations
  2. GRB 130327A: Enhanced Swift-XRT position
  3. GRB 130327A: RATIR Optical and NIR Observations
  4. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  5. GRB 130325A: Fermi LAT detection
  6. GRB 130327A: Swift detection of a burst
  7. report: GRB 130315A: Zadko observatory - Gingin optical observations
  8. GRB 130325A: Fermi GBM detection
  9. Konus-Wind observation of GRB 130320A
  10. IPN Triangulation of GRB 130320A (long/very bright)
  11. GRB 130305A: Gemini follow-up observations
  12. GRB 130315A: GROND afterglow candidate
  13. GRB 130305A: optical upper limit in Mondy observatory
  14. GRB 130315A: Swift/UVOT Upper Limits
  15. GRB 130313A: optical upper limit in CrAO
  16. GRB 130313A: optical upper limit in Mondy observatory
  17. GRB 130315A: SALT optical observations
  18. GRB130313A: GTC early optical limits
  19. GRB 130313A: 5.8 GHz VLA upper limit
  20. GRB 130315A: Swift-XRT refined Analysis
  21. Swift XRT observations of GRB 130310A
  22. GRB 130315A, Swift-BAT refined analysis
  23. GRB 130313A: Swift/UVOT Upper Limits
  24. GRB 130305A: PTF P48 optical upper limits
  25. GRB130315A BOOTES-3 optical limit
  26. GRB 130315A: Swift detection of a burst
  27. GRB 130310A : Suzaku WAM observation of the prompt emission
  28. GRB 130305A: TLS Tautenburg observations
  29. GRB 130313A: RATIR Optical and NIR Observations
  30. GRB 130313A: TNG optical observations
  31. GRB 130313A: Swift-BAT Spectral lag analysis
  32. GRB 130313A: Fading X-ray Afterglow
  33. GRB 130215A: Detection of the SN with the 10.4m GTC
  34. GRB130313A: Optical observations from GTC
  35. GRB 130313A: NOT optical upper limit
  36. GRB 130313A: Swift-XRT refined Analysis
  37. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  38. GRB 130313A: Weihai optical upper limit
  39. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  40. GRB 130313A: Swift-BAT refined analysis
  41. GRB 130313A: Zadko observatory - Gingin optical observations
  42. GRB 130313A: MASTER-Net optical observations
  43. GRB 130313A: Swift detection of a short burst
  44. IPN Triangulation of GRB 130307A
  45. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  46. Swift XRT RETRACTION of GRB 130310A afterglow detection
  47. GRB 130310A: optical observations
  48. Swift XRT observations of GRB 130310A
  49. GRB 130306A: Swift Detection of a Possible Afterglow
  50. GRB 130131B: host detection and redshift
  51. Konus-Wind observation of GRB 130310A
  52. IPN triangulation of GRB 130310A
  53. GRB 130310A: Fermi GBM detection
  54. GRB 130310A: Fermi-LAT detection and localization
  55. GRB 130131A: JCMT SCUBA-2 sub-mm observations
  56. GRB 130306A: MITSuME Ishigakijima upper limits
  57. GRB 130306A: Swift-BAT refined analysis
  58. IPN triangulation of GRB 130228A
  59. GRB 130305A BAT refined circular
  60. GRB 130305A: Further Swift-XRT Observations
  61. Konus-Wind observation of GRB 130306A
  62. GRB 130305A: Optical Observations
  63. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  64. GRB 130305A: Gemini-North upper limit
  65. GRB 130307A: Fermi GBM detection
  66. GRB 130306A: Fermi GBM observation
  67. GRB 130306A: MASTER-Net pre-Swift alert observation
  68. GRB 130305A: Swift/UVOT Upper Limit
  69. GRB 130305A: RATIR Observations
  70. GRB 130306A: Swift detection of a burst
  71. GRB 130305A: P60 Observations
  72. GRB 100615A: HST host detection and X-shooter redshift
  73. GRB 130305A: Swift/XRT detection of the afterglow
  74. Konus-Wind observation of GRB 130305A
  75. GRB 130305A: Fermi GBM observation
  76. GRB 130305A: Fermi LAT Detection
  77. Fermi GBM trigger 130301.638 is not GRB
  78. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  79. GRB 130305A found in ground analysis of Swift/BAT data
  80. GRB 121128A: optical observations in Mondy observatory
  81. GRB 121128A: optical upper limit in Maidanak observatory
  82. GRB 130216A: Swift/UVOT Upper Limit
  83. GRB 130219A: Suzaku WAM observation of the prompt emission
  84. Konus-Wind observation of GRB 130219A
  85. GRB 130216B: Suzaku WAM observation of the prompt emission
  86. GRB 130216A: possible radio counterpart is steady field source
  87. GRB 130216A: Swift/XRT observations
  88. IPN Triangulation of GRB 130219A
  89. GRB 130215A: Suzaku WAM observation of the prompt emission
  90. GRB 130215A: PTF P48 optical detection
  91. GRB 130219A: Fermi GBM detection
  92. GRB 130216B: Swift/XRT observations
  93. GRB 130216A: Further Swift-BAT refined analysis
  94. GRB 130216B: MASTER-Net early observation
  95. GRB 130216A: MASTER-Net early observations
  96. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  97. GRB 130216A: Fermi GBM observation
  98. GRB 130216B: Fermi GBM observation
  99. GRB 130216A: possible early detection at 15 GHz
  100. GRB 130216A: MITSuME Ishigakijima upper limits

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