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"

32717 results found.

  1. Konus-Wind observation of GRB 061201
  2. GRB061202: optical/NIR observations with REM
  3. GRB061202: Swift/UVOT Upper Limits
  4. GRB 061202, Swift-BAT refined analysis
  5. GRB 061201: Swift XRT Team refined analysis
  6. GRB 061201: VLT optical observations
  7. GRB 061201: Initial UVOT Observations
  8. GRB 061201, Swift-BAT refined analysis of the SHB
  9. GRB 061122: GETS observation
  10. GRB 061121, SMARTS optical/IR observations
  11. GRB 061121: flattening of the decay
  12. INT+WFC observations of GRB 061126
  13. GRB 061126: Possible Jet Break
  14. GRB 061121: Second Epoch ATCA Radio Observations
  15. GRB 061126: RAPTOR Optical Detection During Gamma-Ray Emission
  16. Swift XRT on-board boresight update
  17. GRB 061121: ATCA & WSRT Radio Observations
  18. GRB061121: optical observations
  19. GRB 061126: Early Super-LOTIS Observations
  20. GRB 061126: optical observation
  21. RHESSI Spectrum of GRB061126
  22. GRB 061126: Tautenburg afterglow observations
  23. GRB061126: Optical afterglow observations from MIRO
  24. GRB061126: Optical afterglow observations from MIRO
  25. GRB 061126 : SDSS Pre-Burst Observations
  26. GRB 061126: Swift-XRT refined analysis
  27. GRB 061126: Swift/UVOT Observations
  28. GRB 061126, Swift-BAT refined analysis
  29. GRB 061126: SARA Observations
  30. GRB 061126: Early Detection of the IR Afterglow
  31. GRB 061126: Faulkes Telescope North Optical Observations
  32. GRB 061121: MDM Continued Monitoring
  33. GRB 061122: Confirmation of X-ray/Optical Afterglow
  34. GRB 061121: MDM Continuing Optical Decay
  35. GRB061121: optical observations
  36. GRB 061122: Candidate Optical Afterglow
  37. GRB 061121: Ep,i - Eiso correlation
  38. GRB 061121: MDM Optical Decay
  39. GRB061122: Swift/UVOT Optical Observations
  40. GRB 061121: ART detection in Ic
  41. GRB061121: P60 Observations
  42. Radio detection of GRB 061121
  43. GRB061122: Swift-XRT position
  44. Konus-Wind observation of GRB 061122
  45. GRB 061121: MDM Optical Observations
  46. GRB 061121 declared "Burst of Interest" by Swift team
  47. RHESSI Spectrum of GRB061121
  48. Konus-Wind and Konus-A observations of GRB 061121
  49. INTEGRAL results on GRB 061122
  50. GRB 061121: Swift/UVOT Observations
  51. GRB 061121: Swift-XRT Team Refined Analysis
  52. GRB 061121, Swift-BAT refined analysis
  53. GRB061121, optical observation
  54. GRB 061121: Optical observation at the KANATA 1.5m telescope
  55. GRB 061121: Faulkes Telescope North Optical Observation
  56. GRB061121: Spectroscopic Redshift
  57. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  58. GRB 060605: NIR Observations
  59. GRB 050915B: optical afterglow
  60. GRB 060111B: Swift UVOT Refined Magnitudes
  61. GRB061110A: Correction to GCN5817
  62. GRB 061110A: refined R-band analysis
  63. GRB 061110B: NIR Observations
  64. Swift/UVOT Upper Limits for GRB061110b
  65. Swift/UVOT Upper Limits for GRB061110a
  66. GRB 061110B: Swift XRT refined analysis
  67. GRB 061110B, Swift-BAT refined analysis
  68. GRB 061110B: VLT redshift
  69. GRB 061110B: NOT optical observations
  70. GRB 061110A: Swift XRT refined analysis
  71. GRB 061110B: Swift/XRT position
  72. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  73. GRB 061110A, Swift-BAT refined analysis
  74. GRB 061110: ROTSE-III Optical Limits
  75. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  76. GRB 061109: optical observation
  77. GRB061028: MAGIC telescope GeV observation
  78. GRB 061007: Third Epoch ATCA Radio Observations
  79. GRB061019: second epoch CrAO observations
  80. GRB 061028: Swift/XRT Astrometry Correction
  81. GRB 061102: Swift/UVOT Magnitude Upper Limits
  82. GRB 061102, XRT refined analysis
  83. GRB 061004: Further VLT/NTT observations
  84. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  85. GRB061102B: Super-LOTIS observations
  86. GRB 061028: Optical R passband observations
  87. GRB 061102, Swift-BAT refined analysis
  88. GRB 061028: VLA Observation
  89. GRB 061004: Swift/XRT Astrometry Correction
  90. GRB 060801: Swift/XRT Astrometry Correction
  91. GRB 061028: Futher P200 Observations
  92. GRB 061028: MDM Observations
  93. GRB 061028: P200 Observations
  94. GRB 061028: SARA upper limit
  95. GRB 061028: z band imaging
  96. GRB061028: XRT refined analysis
  97. GRB 061028: Swift/UVOT Observations
  98. GRB 061028, Swift-BAT refined analysis
  99. GRB 061027, Swift refined analysis of a possible burst
  100. GRB061025: ROTSE-III Confirmation of Optical Counterpart

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