Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

27112 results found.

  1. Swift/UVOT Upper Limits for GRB061110a
  2. GRB 061110B, Swift-BAT refined analysis
  3. GRB061110B: Optical observations at Crni Vrh
  4. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  5. GRB 061110B: Swift-UVOT Initial Observation
  6. GRB 061110A, Swift-BAT refined analysis
  7. GRB 061110B: TAROT Calern observatory optical observations
  8. GRB 061110B: Swift detection of a burst
  9. GRB 061110: ROTSE-III Optical Limits
  10. GRB 061110: Swift detection of a burst
  11. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  12. GRB 061109: optical observation
  13. GRB 061109: TAROT Calern observatory optical observations
  14. GRB 061109: Swift detection of a possible burst
  15. GRB 061027: TAROT La Silla observatory optical observations
  16. GRB 061102: Swift/UVOT Magnitude Upper Limits
  17. GRB 061102, XRT refined analysis
  18. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  19. GRB061102B: Super-LOTIS observations
  20. GRB 061028: Optical R passband observations
  21. GRB 061102B: Swift detection of a possible burst
  22. GRB 061102, Swift-BAT refined analysis
  23. GRB 061102: Swift detection of a burst
  24. GRB 061028: MDM Observations
  25. GRB 061028: SARA upper limit
  26. GRB 061028: z band imaging
  27. GRB061028: XRT refined analysis
  28. GRB 061028: Swift/UVOT Observations
  29. GRB 061028, Swift-BAT refined analysis
  30. GRB 061028: TAROT Calern observatory late optical observations
  31. GRB 061028: TAROT Calern observatory optical observations
  32. GRB 061028: Swift detection of a burst
  33. GRB 061027, Swift refined analysis of a possible burst
  34. GRB 061027: Swift detection of a possible burst
  35. GRB061025: Swift XRT refined analysis
  36. GRB061025: Swift/UVOT observations
  37. GRB 061019: MITSuME upper limits
  38. GRB 061025: ROTSE-III Optical Limits
  39. GRB 061021, Swift-BAT Lag analysis
  40. Konus-Wind observation of GRB 061021
  41. GRB 061021: Swift-XRT refined analysis
  42. GRB 061021: Swift/UVOT Observation
  43. GRB 061021, Swift-BAT refined analysis
  44. GRB 061021: Swift detection of a burst
  45. GRB 061019: Super-LOTIS upper limit
  46. GRB 061019: SARA upper limit
  47. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  48. GRB 061019: Swift/UVOT upper limit
  49. GRB 061019, Swift-BAT refined analysis
  50. GRB 061019: TAROT La Silla observatory optical observations
  51. GRB061019: Swift/XRT position
  52. GRB 061019: Swift-BAT detection of a burst
  53. GRB 061007: Suzaku/WAM observation of the prompt emission
  54. Konus-Wind observation of GRB 061007
  55. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  56. GRB061007: Swift UVOT followup observations
  57. GRB 061006 : Suzaku/WAM observation of the prompt emission
  58. GRB 061007: Magellan Spectroscopy
  59. GRB 061007: Swift-BAT refined analysis
  60. GRB 061006: Swift/UVOT optical observations
  61. Konus-Wind observation of the short hard GRB 061006
  62. GRB 061007 - FTS early brightening and power law decay
  63. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  64. GRB 061007: Swift detection of a burst with an optical counterpart
  65. GRB 061007: ROTSE-III Detection of Optical Counterpart
  66. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  67. GRB 061006: Swift detection of a burst
  68. GRB061004: Swift/UVOT optical observations
  69. GRB 061004: Swift-XRT Team Refined Analysis
  70. GRB 061004, Swift BAT refined analysis
  71. GRB 061004: Swift detection of a burst
  72. GRB 060928: Suzaku/WAM observation of the prompt emission
  73. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  74. GRB 060928: Swift observations
  75. GRB 061002: Swift-XRT Team Refined Analysis
  76. GRB061002 - SDSS Pre-Burst Observations
  77. GRB 061002, Swift-BAT refined analysis
  78. GRB061002: MASTER-VWF-Kislovodsk observations
  79. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  80. GRB 061002: Swift detection of a burst
  81. GRB060930: Faulkes Telescope South observation
  82. GRB 060929: Swift/UVOT Optical Observations
  83. GRB 060930: ROTSE-III Optical Limits
  84. GRB060929: Swift-XRT refined analysis.
  85. GRB 060929, Swift-BAT refined analysis
  86. GRB 060929: MASTER-VWF-Kislovodsk observations
  87. Liverpool Telescope observations of GRB 060929
  88. GRB 060929: Swift detection of a burst
  89. GRB 060927: Swift/UVOT Optical Observations
  90. GRB 060927: Early color
  91. GRB 060927: Swift XRT Team refined analysis
  92. GRB 060927, Swift-BAT refined analysis
  93. GRB060927: Faulkes Telescope South observation
  94. GRB060927 - SDSS Pre-Burst Observations
  95. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  96. GRB 060927: Swift detection of a burst
  97. GRB 060926: Swift-UVOT Detections
  98. GRB 060926, Swift-BAT refined analysis
  99. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  100. GRB 060926: Swift detection of a burst

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