Skip to main content
New! Browse Circulars by Event, Advanced Search, Sample Codes, Schema Release. 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"

18649 results found.

  1. GRB 080319B: TORTORA synchronous observation
  2. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  3. GRB 080319B: Enhanced Swift-XRT position
  4. GRB 080319A: Enhanced Swift-XRT position
  5. GRB 080319A, Swift-BAT refined analysis
  6. GRB 080319C: Early Super-LOTIS Observations
  7. GRB 080319C: Swift detection of a burst with an optical afterglow
  8. GRB 080319C: KAIT OA candidate
  9. GRB 080319b prompt optical observation by Pi-of-the-Sky
  10. GRB 080319B: Gemini-South Spectroscopy
  11. GRB080319B Liverpool Telescope optical afterglow candidate
  12. GRB 080319B: Super-LOTIS Detection of a Bright OT
  13. GRB 080319B: KAIT OA
  14. GRB 080319B: UVOT Position
  15. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  16. GRB 080319A: Swift detection of a burst
  17. Swift Trigger 306745 is not a GRB
  18. Swift Trigger 306616 is not a GRB
  19. Swift/UVOT observations of GRB 080315
  20. Swift trigger 306323: Swift-BAT/XRT refined analysis
  21. SAX J1818.6-1703: Swift detection (trigger 306379)
  22. GRB 080315: TAROT Calern observatory optical observations
  23. GRB 080315: Swift detection of a possible burst
  24. GRB 080310: ROTSE-III Observations of Optical Counterpart
  25. GRB 080310, Swift-BAT refined analysis
  26. GRB 080310: Swift-XRT refined analysis
  27. GRB 080310: Swift/UVOT Refined Analysis
  28. GRB 080310 - SDSS Pre-Burst Observations
  29. GRB 080310: Enhanced Swift-XRT position
  30. GRB 080310: VLT/UVES spectroscopy
  31. GRB080310: Super-LOTIS suggestion of brightening
  32. GRB 080310: Swift detection of a burst with optical afterglow
  33. GRB080229, optical upper limit (Correction)
  34. GRB080307, optical upper limit
  35. GRB080229, optical upper limit
  36. GRB 080307: Swift-XRT Team refined analysis
  37. GRB 080307: Swift/UVOT Upper Limits
  38. GRB 080307: Early RAPTOR Limits
  39. GRB 080307, Swift-BAT refined analysis
  40. GRB080307 - SDSS Pre-Burst Observations
  41. GRB 080307: retraction of UVOT candidate
  42. GRB 080307: Enhanced Swift-XRT position
  43. GRB 080307, Preliminary Swift-BAT refined analysis
  44. GRB 080307: Swift detection of a burst
  45. VLA possible radio detection of GRB 080229
  46. GRB 080303: Swift/UVOT follow-up of afterglow detection
  47. GRB 080303, Swift-BAT refined analysis
  48. GRB080303: Swift XRT refined analysis
  49. GRB 080303: Enhanced Swift-XRT position
  50. Swift UVOT observations of GRB080229B
  51. GRB080229B: Swift XRT afterglow observation
  52. GRB 080303A: Faulkes Telescope South optical afterglow observations
  53. GRB 080303: Swift detection of a burst with optical afterglow
  54. GRB 080303A: ROTSE-III Optical Limits
  55. GRB 080229: I-band observations from OSN
  56. GRB080229: Swift XRT refined analysis
  57. GRB 080229: Enhanced Swift-XRT position
  58. UVOT analysis for GRB080229
  59. GRB 080229, Swift-BAT refined analysis
  60. GRB 080229: Faulkes Telescope South optical limit
  61. GRB 080229A: ROTSE-III Optical Limits
  62. GRB 080229: Swift detection of a bright burst
  63. Swift-XRT improved positions, and new redshift limits.
  64. ESO optical and NIR observations of GRB 080218B
  65. GRB 080204: Suzaku WAM observation of the prompt emission
  66. GRB 080218B, Swift-BAT refined analysis
  67. GRB 080218B: Swift-XRT refined analysis
  68. Swift/UVOT observations of GRB080218B
  69. GRB 080218B: Enhanced Swift-XRT position
  70. GRB 080218B: GROND upper limits
  71. GRB 080218A, Swift-BAT refined analysis
  72. GRB080218B: Watcher prompt limit
  73. GRB 080218B: Swift detection of a burst
  74. GRB 080218: Swift detection of a burst
  75. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  76. VLA radio upper limit on GRB 080212
  77. Swift/UVOT refined analysis of GRB080212
  78. GRB 080212, Swift-BAT refined analysis
  79. GRB 080212: GROND detects afterglow
  80. GRB 080212: optical observations
  81. GRB 080212: Enhanced Swift-XRT position
  82. GRB 080212: Swift-XRT Team refined analysis
  83. GRB 080210: Keck photometry
  84. VLA non-detection of GRB 080210
  85. GRB 080212: Swift detection of a burst
  86. GRB 080210: Swift/UVOT Refined Analysis
  87. GRB 080210, Swift-BAT refined analysis
  88. GRB 080210: Super-LOTIS observations
  89. GRB 080210: Swift-XRT Refined Analysis
  90. GRB 080210: Enhanced Swift-XRT position
  91. GRB 080210: GOND detection in all bands and redshift upper limit
  92. GRB080210 - SDSS Pre-Burst Observations
  93. GRB 080210: Swift detection of a burst with optical afterglow
  94. GRB 080210: TAROT La Silla observatory optical detection
  95. GRB 080207: GROND upper limits
  96. GRB 080207, Swift-BAT refined analysis
  97. Swift detection of AX J1749.1-2639
  98. GRB 080207, Swift-BAT refined analysis
  99. Swift Trigger 302777 is not a GRB
  100. GRB080207: Swift/UVOT refined analysis

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