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"
  1. GRB060919: Swift/UVOT optical observations
  2. GRB 060919 : Faulkes South Telescope Observations
  3. GRB 060919, Swift-BAT refined analysis
  4. GRB060919: XRT refined analysis
  5. GRB 060919: TAROT optical observations
  6. GRB 060919: Swift detection of a burst
  7. GRB 060912A: VLA Observation
  8. GRB 060912A: Probable Host Galaxy
  9. IBAS Alert n.3470: not a GRB
  10. GRB060825: MAGIC telescope GeV observation
  11. Konus-Wind observation of GRB 060912
  12. IBAS Alert No.3468: not a GRB
  13. GRB 060912: Redshift of nearby 2MASS galaxy
  14. GRB060912: optical observations
  15. GRB 060912B: Watcher observations
  16. GRB060912: Swift/UVOT Observations
  17. GRB060912: OPTIMA-Burst optical observations
  18. GRB 060912B: a long GRB detected with INTEGRAL
  19. GRB 060912: Swift XRT Team Refined Analysis
  20. GRB 060912, Swift-BAT refined analysis
  21. GRB 060912: Correction to GCN 5559
  22. GRB 060912: Xinglong TNT optical observations
  23. GRB 060912: Swift detection of a burst with an optical afterglow
  24. GRB060906: Danish/DFOSC optical observations
  25. VLA observations of GRB 060908
  26. GRB 060908: redshift
  27. GRB 060908, Swift/XRT refined analysis
  28. GRB 060908: Swift/UVOT Observations
  29. GRB 060908: Danish/DFOSC optical observations
  30. GRB 060908, Swift-BAT refined analysis
  31. GRB 060908 - SDSS Pre-burst Observations
  32. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  33. GRB 060904B: Kiso Optical observation
  34. GRB 060904A : Optical limit
  35. GRB 060908: REM optical prompt observation
  36. GRB 060908: PROMPT Detection of a Bright Counterpart
  37. GRB 060908: Swift detection of a burst with a bright optical counterpart
  38. GRB 060904A: Suzaku/WAM observation of the prompt emission
  39. GRB060906 , optical observation
  40. GRB060904b optical detections (delayed report due to internet outage)
  41. GRB 060906: optical observation
  42. GRB 060906: Early RAPTOR optical limits
  43. GRB 060906, Swift-BAT refined spectral analysis
  44. GRB 060906: Swift/XRT Refined Analysis
  45. GRB 060906: Swift-UVOT observations
  46. VLT redshift of GRB 060906
  47. GRB 060906, Swift-BAT refined analysis
  48. GRB 060906: FRAM observations - flash determination (airplane)
  49. GRB 060906: KAIT observations
  50. GRB 060906: Confirmation of P60 Optical Afterglow
  51. GRB 060906: observations with FRAM
  52. GRB 060906 (?): P60 Optical Afterglow Candidate
  53. GRB 060906: Swift detection of a probable burst
  54. GRB 060904A Milagro GeV/TeV Observations
  55. GRB060904b, optical observations
  56. GRB 060904b: SMARTS optical/IR afterglow observations
  57. GRB 060904B: RTT150 optical observations
  58. GRB060904A: Swift/UVOT optical observations
  59. GRB 060904A: Subaru NIR observation
  60. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  61. GRB 060904B: Swift-BAT refined analysis
  62. GRB060904b: Optical observations with Swift/UVOT
  63. Konus-Wind observation of GRB 060904A
  64. GRB 060904B: Swift-XRT refined analysis
  65. GRB 060904A: Refined analysis of the Swift-BAT burst
  66. GRB 060904A: Swift-XRT refined analysis
  67. GRB 060904A: Suzaku-XIS and -HXD observation plan
  68. GRB 060904B: VLT redshift
  69. GRB 060904A: P60 Observations
  70. GRB 060904B: Optical observations at Crni Vrh
  71. GRB060904B: Watcher observations
  72. GRB 060904B BOOTES-IR and 1.5m OSN observations
  73. GRB 060904B: TAROT optical counterpart observations
  74. GRB060904B - SDSS Pre-Burst Observations
  75. GRB 060904: TAROT optical observations
  76. GRB 060904B: Swift detection of a burst with optical counterpart
  77. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  78. GRB060904 - SDSS Pre-Burst Observations
  79. GRB 060904: Swift detection of a bright burst
  80. GRB060901: Optical observations
  81. 060901: Swift UVOT followup observations
  82. GRB 060901: pseudo-z from spectral parameters of the prompt
  83. Konus-Wind observation of GRB 060901
  84. GRB 060901: SMARTS optical/IR observations update
  85. GRB 060901: Swift/XRT Refined Analysis
  86. GRB 060901: SMARTS optical/IR observations
  87. GRB 060901: Swift/XRT Position
  88. GRB 060901: further INTEGRAL results
  89. GRB 060901: Watcher observations
  90. GRB 060901: a long GRB detected by INTEGRAL
  91. Two bright bursts from SGR 1806-20 detected with IBAS
  92. GRB 060605, observations using an Integral Field Unit
  93. GRB 060604: VLA Observation
  94. GRB 060814: Suzaku/WAM observation of the prompt emission
  95. GRB 060605: VLA Observation
  96. GRB 060707: VLA observation
  97. GRB 060825: VLA observations
  98. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  99. Swift-BAT trigger 226614 is not a GRB
  100. GRB060826 - SDSS Pre-Burst Observations

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