Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

42592 results found.

  1. GRB 130315A, Swift-BAT refined analysis
  2. GRB 130313A: Swift/UVOT Upper Limits
  3. GRB 130305A: PTF P48 optical upper limits
  4. GRB130315A BOOTES-3 optical limit
  5. GRB 130315A: Swift detection of a burst
  6. GRB 130310A : Suzaku WAM observation of the prompt emission
  7. GRB 130305A: TLS Tautenburg observations
  8. GRB 130313A: RATIR Optical and NIR Observations
  9. GRB 130313A: TNG optical observations
  10. GRB 130313A: Fading X-ray Afterglow
  11. Swift-BAT trigger 551030 is not astrophysical
  12. GRB 130215A: Detection of the SN with the 10.4m GTC
  13. GRB130313A: Optical observations from GTC
  14. GRB 130313A: NOT optical upper limit
  15. GRB 130313A: Swift-XRT refined Analysis
  16. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  17. GRB 130313A: Weihai optical upper limit
  18. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  19. GRB 130313A: Swift-BAT refined analysis
  20. GRB 130313A: Zadko observatory - Gingin optical observations
  21. GRB 130313A: MASTER-Net optical observations
  22. GRB 130313A: Swift detection of a short burst
  23. IPN Triangulation of GRB 130307A
  24. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  25. Swift XRT RETRACTION of GRB 130310A afterglow detection
  26. GRB 130310A: optical observations
  27. Swift XRT observations of GRB 130310A
  28. GRB 130306A: Swift Detection of a Possible Afterglow
  29. GRB 130131B: host detection and redshift
  30. Konus-Wind observation of GRB 130310A
  31. IPN triangulation of GRB 130310A
  32. GRB 130310A: Fermi GBM detection
  33. GRB 130310A: Fermi-LAT detection and localization
  34. GRB 130306A: Swift-BAT refined analysis
  35. IPN triangulation of GRB 130228A
  36. GRB 130305A BAT refined circular
  37. GRB 130305A: Further Swift-XRT Observations
  38. Konus-Wind observation of GRB 130306A
  39. GRB 130305A: Optical Observations
  40. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  41. GRB 130305A: Gemini-North upper limit
  42. GRB 130307A: Fermi GBM detection
  43. GRB 130306A: Fermi GBM observation
  44. GRB 130306A: MASTER-Net pre-Swift alert observation
  45. GRB 130305A: Swift/UVOT Upper Limit
  46. GRB 130305A: RATIR Observations
  47. GRB 130306A: Swift detection of a burst
  48. GRB 130305A: P60 Observations
  49. GRB 100615A: HST host detection and X-shooter redshift
  50. GRB 130305A: Swift/XRT detection of the afterglow
  51. Konus-Wind observation of GRB 130305A
  52. GRB 130305A: Fermi GBM observation
  53. GRB 130305A: Fermi LAT Detection
  54. Fermi GBM trigger 130301.638 is not GRB
  55. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  56. GRB 130305A found in ground analysis of Swift/BAT data
  57. GRB 121128A: optical observations in Mondy observatory
  58. GRB 121128A: optical upper limit in Maidanak observatory
  59. GRB 130216A: Swift/UVOT Upper Limit
  60. GRB 130219A: Suzaku WAM observation of the prompt emission
  61. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  62. Trigger 549841: Swift detection of SGR1806-20
  63. Konus-Wind observation of GRB 130219A
  64. GRB 130216B: Suzaku WAM observation of the prompt emission
  65. GRB 130216A: possible radio counterpart is steady field source
  66. GRB 130216A: Swift/XRT observations
  67. IPN Triangulation of GRB 130219A
  68. GRB 130215A: Suzaku WAM observation of the prompt emission
  69. GRB 130215A: PTF P48 optical detection
  70. GRB 130219A: Fermi GBM detection
  71. GRB 130216B: Swift/XRT observations
  72. GRB 130216A: Further Swift-BAT refined analysis
  73. GRB 130216B: MASTER-Net early observation
  74. GRB 130216A: MASTER-Net early observations
  75. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  76. GRB 130216A: Fermi GBM observation
  77. GRB 130216B: Fermi GBM observation
  78. GRB 130216A: possible early detection at 15 GHz
  79. GRB 130216B BAT refined analysis
  80. GRB 130216B: P200 NIR Observations
  81. GRB 130216A: P200 NIR Observations
  82. GRB 130216A: Swift-BAT refined analysis
  83. GRB 130216A: TAROT La Silla observatory optical observations
  84. GRB 130215A: Additional P200 NIR observations
  85. GRB 130216B: Burst found in ground analysis of BAT data
  86. GRB 120118B: host observations and redshift determination
  87. GRB 130216A: OSN I-band observations
  88. GRB 130216A: Swift detection of a burst
  89. GRB 130215A: P200 NIR observations
  90. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  91. GRB 130215A: Fermi GBM detection
  92. GRB 130215A: RAPTOR Measurements
  93. GRB 130215A: iTelescope T11 observations
  94. GRB 130215A: Xinglong optical observations
  95. GRB 130215A: Swift-BAT refined analysis
  96. GRB 130215A: TAROT La Silla observatory optical observations
  97. GRB 130215A: RATIR Optical and NIR Observations
  98. GRB 130215A: REM NIR observations
  99. GRB 130215A: CARMA 3mm detection
  100. GRB 130215A: P60 Observations

Advanced

Download all Circulars as a .tar.gz archive:
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