Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

19415 results found.

  1. Swift detection of an SGR burst from AXP 4U 0142+61
  2. IPN Triangulation of GRB 120107A
  3. GRB 120106A: Swift/UVOT Upper Limits
  4. GRB 120106A: Bassano Bresciano Observatory optical observations
  5. GRB 120106A: MASTER Early OT marginally detection
  6. GRB 120106A: Swift-XRT refined Analysis
  7. GRB 120106A: Swift-BAT refined analysis
  8. GRB 120106A: Enhanced Swift-XRT position
  9. GRB 120106A: TAROT Calern observatory optical observations
  10. GRB 120106A: MASTER-Tunka optical observations
  11. GRB 120106A: Swift detection of a burst
  12. GRB 111222A: Second Swift observation
  13. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  14. GRB 120102A: Fermi GBM observation
  15. Konus-Wind observation of GRB 120102A
  16. GRB 120102A: Swift-BAT refined analysis
  17. GRB 120102A: Swift-XRT refined Analysis
  18. GRB 120102A: Swift/UVOT Detection
  19. GRB 120102A: Enhanced Swift-XRT position
  20. GRB 120102A: Swift detection of a burst with an optical counterpart
  21. GRB 111228A, optical observations
  22. Konus-Wind observation of GRB 111228A
  23. GRB 111229A: Swift/UVOT Detection
  24. GRB 111229A: Faulkes Telescope South observations
  25. GRB 111229A: Swift-XRT refined Analysis
  26. GRB 111229A: Enhanced Swift-XRT position
  27. GRB 111229A: Swift-BAT refined analysis
  28. GRB 111229A: Swift detection of a burst
  29. GRB 111225A: Lightbuckets Optical Observations
  30. GRB 111228A: P60 Observations
  31. GRB 111228A: T100 observations
  32. GRB 111228A: Swift-XRT refined Analysis
  33. GRB 111228A: PAIRITEL NIR Detection
  34. GRB 111228A: TAROT La Silla observatory observations
  35. GRB 111228A: MASTER OT observations
  36. GRB 111228A: Swift/UVOT Detection
  37. GRB 111228A, Swift-BAT refined analysis
  38. GRB 111228A: Enhanced Swift-XRT position
  39. GRB 111228A: TAROT Calern observatory. OT decay stopped
  40. GRB 111228A: Fermi GBM observation
  41. GRB 111228A: TAROT Calern observatory. OT seems still bright
  42. GRB 111228A: Swift detection of a burst with an optical counterpart
  43. GRB 111225A: Swift/UVOT Observations
  44. GRB 111215A: Keck/LRIS Imaging
  45. GRB 111225A: Keck/LRIS Afterglow Photometry
  46. GRB 111225A: PAIRITEL NIR Upper Limits
  47. GRB 111225A: GRT Optical Observation
  48. GRB 111225A: Swift-XRT refined Analysis
  49. GRB 111225A, Swift-BAT refined analysis
  50. GRB 111225A: Enhanced Swift-XRT position
  51. GRB 111225A: TAROT Calern observatory optical detection
  52. GRB 111225A: TAROT Calern observatory optical observations
  53. GRB 111225A: Swift detection of a burst with an optical counterpart
  54. GRB 111222A: Swift/UVOT Observations
  55. GRB 111222A: Swift-XRT observations
  56. IPN Triangulation of GRB 111222A (short/hard/intense)
  57. Trigger 510075 is not a GRB
  58. GRB 111215A: EVLA observations
  59. GRB111215A: CARMA Detection
  60. XRT GRB Catalogue now live and online
  61. GRB 111103B: optical upper limit
  62. GRB 110820A: optical observations in Maidanak observatory
  63. GRB 111103A: optical upper limit of Mt. Terskol observatory
  64. GRB 111215B: Suzaku WAM observation of the prompt emission
  65. GRB111215A: optical upper limit
  66. GRB 111215B: Swift/UVOT Upper Limits
  67. GRB 111215B: Swift-XRT observations
  68. GRB 111205A: Confirmation of X-ray Afterglow
  69. IPN Triangulation of GRB 111215B (long/intense)
  70. GRB 111215A: Swift/UVOT Upper Limits
  71. GRB 111215A: Swift-XRT refined Analysis
  72. Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC
  73. GRB 111215A: Enhanced Swift-XRT position
  74. GRB 111215A: Swift-BAT refined analysis
  75. GRB 111215A: MASTER-Net optical prompt and follow up observations
  76. GRB 111215A, Optical Observations
  77. GRB 111209A: RAPTOR Limits Before and During the Gamma-ray Emitting Interval
  78. GRB 111215A: Swift detection of a burst
  79. GRB 111212A: GROND observations
  80. GRB 111211A: Swift/UVOT Detection
  81. GRB 111212A: Swift-XRT refined Analysis
  82. GRB 111211A: Swift/XRT target of opportunity observation
  83. GRB 111212A: Swift/UVOT Upper Limits
  84. GRB 111212A: Swift-BAT refined analysis
  85. GRB 111212A: Enhanced Swift-XRT position
  86. GRB 111212A: Swift-XRT observations
  87. GRB 111212A: Swift detection of a burst
  88. Konus-Wind observation of GRB 111209A
  89. GRB 111210A: GROND observations
  90. GRB 111210A: Swift-XRT refined Analysis
  91. GRB 111208A: Swift-XRT refined analysis
  92. GRB 111210A: Swift/UVOT Upper Limits
  93. GRB 111210A: Enhanced Swift-XRT position
  94. GRB 111210A: Swift-BAT refined analysis
  95. GRB 111210A: Swift detection of a burst
  96. GRB 111209A: VLT/X-shooter redshift
  97. GRB 111209A: GROND Afterglow observations
  98. GRB 111209A optical limit by "Pi of the Sky"
  99. GRB 111208A: Lightbuckets Optical Observations
  100. GRB 111209A: Swift-XRT 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