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"

36196 results found.

  1. GRB 060927: Xinglong TNT optical observations
  2. GRB060926: improved redshift
  3. GRB 060927, optical observation
  4. GRB 060927: Possible host galaxy (star?) in the SDSS
  5. GRB 060927 : Kiso optical observation
  6. GRB060927: Faulkes Telescope South observation
  7. GRB 060926: MASTER: first minutes decay
  8. GRB060927 - SDSS Pre-Burst Observations
  9. GRB 060927: optical afterglow confirmation
  10. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  11. GRB 060927: Swift detection of a burst
  12. GRB 060926: Swift-UVOT Detections
  13. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  14. GRB 060926: OPTIMA-Burst -- further observations
  15. GRB 060926: Swift XRT refined analysis
  16. GRB 060926, Swift-BAT refined analysis
  17. GRB 060923A: Radio Observations
  18. GRB 060926: MASTER OT alert observation
  19. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  20. GRB 060912A: Redshift of probable host galaxy
  21. GRB 060926: BOOTES-IR observations
  22. GRB 060926: Watcher observations
  23. GRB060926 OPTIMA-Burst optical observation
  24. GRB 060926: MASTER optical observation
  25. GRB 060926: Swift detection of a burst
  26. GRB 060923C, Swift-BAT refined analysis
  27. GRB 060923C: VLA Observation
  28. GRB 060923C: NIR afterglow confirmed
  29. GRB060923C: AROMA optical obsevation
  30. GRB 060923C: Gemini Observations and Afterglow Candidate
  31. GRB 060923C, optical observation
  32. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  33. GRB 060923C: VLT J-band observations
  34. GRB060923B: Swift/UVOT upper limits
  35. GRB 060923B: Swift XRT Refined Analysis
  36. GRB 060923C: Swift XRT refined analysis
  37. GRB 060923C, Swift-BAT partial refined analysis
  38. GRB 060923A: Swift XRT refined analysis
  39. GRB 060923C: Keck Observations
  40. GRB 060923A: Keck and Gemini Observations
  41. GRB 060923C: Xinglong TNT optical observations
  42. GRB 060923B, Swift-BAT refined analysis
  43. GRB060923C : Faulkes Telescope South optical limits
  44. GRB060923C: Faulkes Telescope North optical observations
  45. GRB 060923C: optical observation
  46. GRB 060923C: Swift detection of a burst
  47. GRB 060923B: Swift detection of a burst
  48. GRB 060923, Swift-BAT refined analysis
  49. GRB 060923: Early Super-LOTIS Observations
  50. GRB 060923: UKIRT nIR observations - candidate afterglow
  51. GRB060923 - SDSS Pre-Burst Observations
  52. GRB 060923: KAIT observations
  53. GRB 060923: Swift detection of a burst
  54. Swift detection of IGR J17497-2821 (trigger 230504)
  55. GRB 060919 : Faulkes South Telescope Observations
  56. GRB 060919, Swift-BAT refined analysis
  57. GRB060919: XRT refined analysis
  58. GRB 060919: TAROT optical observations
  59. GRB 060919: Swift detection of a burst
  60. GRB 060912A: VLA Observation
  61. GRB 060912A: Probable Host Galaxy
  62. IBAS Alert n.3470: not a GRB
  63. GRB060825: MAGIC telescope GeV observation
  64. Konus-Wind observation of GRB 060912
  65. IBAS Alert No.3468: not a GRB
  66. GRB 060912: Redshift of nearby 2MASS galaxy
  67. GRB060912: optical observations
  68. GRB 060912B: Watcher observations
  69. GRB060912: OPTIMA-Burst optical observations
  70. GRB 060912B: a long GRB detected with INTEGRAL
  71. GRB 060912: Swift XRT Team Refined Analysis
  72. GRB 060912, Swift-BAT refined analysis
  73. GRB 060912: Correction to GCN 5559
  74. GRB 060912: Xinglong TNT optical observations
  75. GRB 060912: Swift detection of a burst with an optical afterglow
  76. VLA observations of GRB 060908
  77. GRB 060908: redshift
  78. GRB 060908, Swift/XRT refined analysis
  79. GRB 060908: Swift/UVOT Observations
  80. GRB 060908: Danish/DFOSC optical observations
  81. GRB 060908, Swift-BAT refined analysis
  82. GRB 060908 - SDSS Pre-burst Observations
  83. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  84. GRB 060904B: Kiso Optical observation
  85. GRB 060904A : Optical limit
  86. GRB 060908: REM optical prompt observation
  87. GRB 060908: PROMPT Detection of a Bright Counterpart
  88. GRB 060908: Swift detection of a burst with a bright optical counterpart
  89. GRB 060904A: Suzaku/WAM observation of the prompt emission
  90. GRB 060906: optical observation
  91. GRB 060906: Early RAPTOR optical limits
  92. GRB 060906, Swift-BAT refined spectral analysis
  93. GRB 060906: Swift/XRT Refined Analysis
  94. GRB 060906: Swift-UVOT observations
  95. VLT redshift of GRB 060906
  96. GRB 060906, Swift-BAT refined analysis
  97. GRB 060906: FRAM observations - flash determination (airplane)
  98. GRB 060906: KAIT observations
  99. GRB 060906: Confirmation of P60 Optical Afterglow
  100. GRB 060906: observations with FRAM

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