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"

32719 results found.

  1. GRB 060421: Swift-XRT refined analysis
  2. GRB 060418: prediction of t_break
  3. GRB060418: optical observations
  4. Konus-Wind observation of GRB 060418
  5. Possible GRB060421: BART limits
  6. Erratum of GCN 4983 for GRB 060418 IR follow-up
  7. GRB 060418 : IR afterglow observations
  8. GRB 060418 : Lulin Optical follow-up
  9. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  10. GRB 060418: Radio Observations
  11. GRB060418, BVRcIc field calibration
  12. GRB060418: Swift/UVOT Observations
  13. GRB060418: Optical Observations
  14. GRB 060418: FRAM early afterglow observation
  15. GRB 060418: Refined Analysis of the Swift-BAT burst
  16. VLT/UVES observations of GRB060418
  17. GRB 060418, SMARTS continuing afterglow observations
  18. GRB 060418: PROMPT Detections
  19. GRB 060418, SMARTS optical/IR afterglow observations
  20. GRB060418: Magellan/MIKE Spectroscopic Redshift
  21. GRB060418 : LT optical afterglow observation
  22. GRB 060418: REM candidate afterglow
  23. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  24. GRB060413: Swift/UVOT upper limits
  25. GRB 060413: REM NIR Observations
  26. GRB 060413: Refined analysis of the Swift-BAT burst
  27. GRB 060413: Watcher UBVR observations
  28. GRB 060413: XRT refined analysis
  29. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  30. GRB 060413: Swift detection of a burst
  31. GRB060403: optical observations
  32. GRB 060403 Optical observations
  33. GRB 060403: MITSuME optical observation
  34. GRB060403: Optical Limit
  35. GRB060403: XRT refined analysis
  36. GRB 060403: Swift/UVOT upper limits
  37. SGR 1900+14: BAT observations
  38. GRB 060403: Refined analysis of the Swift-BAT burst
  39. GRB060403: Swift XRT refined position
  40. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  41. HETE trigger H4044: RTT150 optical observations
  42. GRB060331: Swift/UVOT upper limits
  43. H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
  44. Swift XRT observations of the HETE transient H4043
  45. HETE Trigger 4043: ROTSE-III Optical Limits
  46. H4043, an unusual high-energy transient observed by HETE
  47. GRB 060322: LNA optical limit
  48. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  49. INTEGRAL and XMM ToO observations of SGR1900+14
  50. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  51. GRB 060323 : WIDGET simultaneous optical observations
  52. GRB 060323: Early optical observation at Xinglong
  53. GRB060218, optical observations
  54. GRB 060322: Confirmation of Swift XRT afterglow
  55. GRB 060211A: optical observation
  56. GRB060323: optical limit
  57. GRB060211B: optical observation
  58. SGR 1900+14: CORRECTION to GCN 4923
  59. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  60. GRB060323: NOT optical observations
  61. GRB 060322: Swift XRT afterglow candidate
  62. GRB060323: P60 Observations
  63. GRB 060323: Swift/UVOT Observations
  64. GRB 060323: optical afterglow confirmed
  65. GRB060323: NOT observations
  66. GRB 060323: Optical Observations
  67. GRB 060323: Tautenburg OT candidate retraction
  68. GRB 060323: Refined analysis of the Swift-BAT burst
  69. GRB 060323: optical observations at TNG
  70. GRB 060323: Swift XRT refined analysis
  71. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  72. GRB 060323: Swift/XRT position
  73. GRB 060322: Refined analysis of the Swift-BAT burst
  74. GRB060323, optical observation
  75. GRB060206: optical observation
  76. GRB060218/SN2006aj: optical observations
  77. GRB 060218/SN 2006aj, LNA optical observation
  78. GRB060218: Refined photometric calibration of comparison stars
  79. GRB 060319: WHT K-band candidate afterglow
  80. GRB060319: Swift XRT refined analysis
  81. GRB060319: Swift/UVOT upper limits
  82. GRB 060319: Re-analysis of TNG data
  83. GRB060319: MASTER limit
  84. GRB 060319: Swift-BAT refined analysis
  85. GRB 060319 optical observations at TNG
  86. GRB060319 : Liverpool Telescope optical limit
  87. GRB060319 - SDSS Pre-burst Observations
  88. GRB060319: Swift/XRT position
  89. GRB060313: Radio Observations
  90. GRB 060313: early afterglow NIR upper limits with REM
  91. Konus-Wind observation of GRB 060313
  92. GRB060313: SSO 40inch Observations
  93. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  94. GRB 060313: PROMPT Observations
  95. GRB 060313: Swift/UVOT Observations
  96. GRB060313:Gemini South Observations
  97. GRB 060313: Swift-XRT team refined analysis
  98. GRB060313: optical observations of the afterglow candidate
  99. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  100. GRB 060313, SMARTS 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