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"

27419 results found.

  1. GRB 130408A - Gemini-S/GMOS redshift determination
  2. GRB 130408A - VLT/X-shooter redshift determination
  3. GRB 130408A: GROND detection of the afterglow
  4. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  5. GRB 130408A: Liverpool Telescope Optical candidate detection
  6. GRB 130408A: Swift detection of a burst
  7. GRB 130211A: Retraction of afterglow candidate
  8. Swift detection of IGR J18245-2452
  9. IPN Triangulation of GRB 130320B (very long/bright)
  10. Swift/XRT observation of GRB 130327B
  11. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  12. GRB 130306A: Confirmation of the X-ray Afterglow
  13. GRB 130310A: RATIR Observations
  14. Swift Trigger 552142 is a noise event
  15. GRB 130327B: Fermi-LAT detection of a burst
  16. GRB 130327B: Fermi GBM detection
  17. Swift Trigger 552142: a possible GRB
  18. GRB 130327A: Swift-BAT refined analysis
  19. GRB 130327A: Swift-XRT refined Analysis
  20. GRB 130327A: Swift/UVOT Upper Limits
  21. GRB 130327A: RATIR Optical and NIR Observations
  22. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  23. GRB 130325A: Fermi LAT detection
  24. GRB 130327A: Swift detection of a burst
  25. report: GRB 130315A: Zadko observatory - Gingin optical observations
  26. GRB 130325A: Fermi GBM detection
  27. GRB 130315A: GROND afterglow candidate
  28. GRB 130315A: Swift/UVOT Upper Limits
  29. GRB 130313A: optical upper limit in CrAO
  30. GRB 130313A: optical upper limit in Mondy observatory
  31. GRB 130315A: SALT optical observations
  32. GRB 130313A: 5.8 GHz VLA upper limit
  33. GRB 130315A: Swift-XRT refined Analysis
  34. GRB 130315A, Swift-BAT refined analysis
  35. GRB 130313A: Swift/UVOT Upper Limits
  36. GRB 130305A: PTF P48 optical upper limits
  37. GRB130315A BOOTES-3 optical limit
  38. GRB 130315A: Swift detection of a burst
  39. GRB 130305A: TLS Tautenburg observations
  40. GRB 130313A: RATIR Optical and NIR Observations
  41. GRB 130313A: Swift-BAT Spectral lag analysis
  42. Swift-BAT trigger 551030 is not astrophysical
  43. GRB130313A: Optical observations from GTC
  44. GRB 130313A: NOT optical upper limit
  45. GRB 130313A: Swift-XRT refined Analysis
  46. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  47. GRB 130313A: Weihai optical upper limit
  48. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  49. GRB 130313A: Swift-BAT refined analysis
  50. GRB 130313A: Zadko observatory - Gingin optical observations
  51. GRB 130313A: Swift detection of a short burst
  52. IPN Triangulation of GRB 130307A
  53. GRB 130306A: Swift Detection of a Possible Afterglow
  54. GRB 130310A: Fermi GBM detection
  55. GRB 130310A: Fermi-LAT detection and localization
  56. GRB 130131A: JCMT SCUBA-2 sub-mm observations
  57. GRB 130306A: MITSuME Ishigakijima upper limits
  58. GRB 130306A: Swift-BAT refined analysis
  59. IPN triangulation of GRB 130228A
  60. GRB 130305A BAT refined circular
  61. GRB 130305A: Further Swift-XRT Observations
  62. Konus-Wind observation of GRB 130306A
  63. GRB 130305A: Optical Observations
  64. GRB 130307A: Fermi GBM detection
  65. GRB 130306A: Fermi GBM observation
  66. GRB 130306A: MASTER-Net pre-Swift alert observation
  67. GRB 130305A: Swift/UVOT Upper Limit
  68. GRB 130305A: RATIR Observations
  69. GRB 130306A: Swift detection of a burst
  70. GRB 130305A: P60 Observations
  71. GRB 100615A: HST host detection and X-shooter redshift
  72. GRB 130305A: Swift/XRT detection of the afterglow
  73. Konus-Wind observation of GRB 130305A
  74. GRB 130305A: Fermi GBM observation
  75. GRB 130305A: Fermi LAT Detection
  76. Fermi GBM trigger 130301.638 is not GRB
  77. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  78. GRB 130305A found in ground analysis of Swift/BAT data
  79. GRB 121128A: optical observations in Mondy observatory
  80. GRB 130216A: Swift/UVOT Upper Limit
  81. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  82. Trigger 549841: Swift detection of SGR1806-20
  83. GRB 130216A: possible radio counterpart is steady field source
  84. GRB 130216A: Swift/XRT observations
  85. IPN Triangulation of GRB 130219A
  86. GRB 130215A: PTF P48 optical detection
  87. GRB 130219A: Fermi GBM detection
  88. GRB 130216B: Swift/XRT observations
  89. GRB 130216A: Further Swift-BAT refined analysis
  90. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  91. GRB 130216A: Fermi GBM observation
  92. GRB 130216B: Fermi GBM observation
  93. GRB 130216A: possible early detection at 15 GHz
  94. GRB 130216A: MITSuME Ishigakijima upper limits
  95. GRB 130216B BAT refined analysis
  96. GRB 130216B: P200 NIR Observations
  97. GRB 130216A: P200 NIR Observations
  98. GRB 130216A: Swift-BAT refined analysis
  99. GRB 130216A: TAROT La Silla observatory optical observations
  100. GRB 130216B: Burst found in ground analysis of BAT data

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