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"

36351 results found.

  1. GRB 060502: APO Spectroscopic Observations
  2. GRB 060502: P60 Afterglow Confirmation
  3. GRB 060502: Swift detection of a burst with an optical counterpart
  4. GRB 060501: MDM Observations
  5. GRB060501: Super-LOTIS observations
  6. GRB 060501: Refined analysis of the Swift-BAT burst
  7. GRB060501: Swift XRT position
  8. GRB 060501: ROTSE-III Optical Limits
  9. GRB 060501: Swift detection of a burst
  10. IPN triangulation of GRB060429 (short/hard)
  11. Konus-Wind observation of GRB 060427B
  12. GRB060428B - SDSS Pre-Burst Observations
  13. GRB060428B: optical observation
  14. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  15. GRB 060428B: MDM Observations
  16. GRB 060428A: PROMPT Observations
  17. GRB 060427B: MASTER optical observations
  18. GRB 060427B: IPN localization of a short hard burst
  19. GRB 060428B: Refined analysis of the Swift-BAT burst
  20. GRB 060428B: Xinglong I-band limit
  21. GRB 060428B: KAIT observations
  22. GRB060425:MASTER optical limit
  23. GRB 051117A: Bright host galaxy not confirmed
  24. GRB 060428A: Refined analysis of the Swift-BAT burst
  25. GRB 060428b : Kiso R-band limit
  26. GRB060427:MASTER optical limit
  27. GRB 060428b: Optical afterglow candidate
  28. GRB 060428B: Swift detection of a burst
  29. GRB 060427: NIR observations
  30. GRB 060428: Swift detection of a burst
  31. GRB 060427: NOT observations
  32. GRB 060427: Swift/UVOT upper limits.
  33. GRB 060427: Refined analysis of the Swift-BAT burst
  34. GRB060418: Swift XRT Team Further Refined Analysis
  35. GRB060425:MASTER survey observations
  36. GRB 060427, optical observation
  37. GRB 060427: Swift detection of a burst
  38. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  39. An interactive program for GRB pseudo-redshift computations
  40. GRB060424: optical afterglow detection
  41. GRB060418: Further Analysis of MIKE Spectroscopy
  42. GRB 060424: Refined analysis of the Swift-BAT burst
  43. GRB 060424: Swift detection of a burst
  44. GRB 060421: TTT Observations
  45. GRB 060421: Swift-BAT Refined Analysis
  46. GRB 060421: Swift-XRT refined analysis
  47. GRB 060418: prediction of t_break
  48. GRB060418: optical observations
  49. Konus-Wind observation of GRB 060418
  50. GRB(?)060421:MASTER optical limit
  51. GRB(?)060421 : XRT position
  52. GRB(?) 060421: Swift detection of a burst
  53. Erratum of GCN 4983 for GRB 060418 IR follow-up
  54. GRB 060418 : IR afterglow observations
  55. GRB 060418 : Lulin Optical follow-up
  56. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  57. GRB 060418: Radio Observations
  58. GRB060418, BVRcIc field calibration
  59. GRB060418: Optical Observations
  60. GRB 060418: FRAM early afterglow observation
  61. GRB 060418: Refined Analysis of the Swift-BAT burst
  62. GRB060418: Swift XRT Team Refined Analysis
  63. GRB 060418, SMARTS continuing afterglow observations
  64. GRB 060418: PROMPT Detections
  65. GRB 060418, SMARTS optical/IR afterglow observations
  66. GRB060418: Magellan/MIKE Spectroscopic Redshift
  67. GRB060418 : LT optical afterglow observation
  68. GRB 060418: REM candidate afterglow
  69. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  70. GRB 060413: REM NIR Observations
  71. GRB 060413: Refined analysis of the Swift-BAT burst
  72. GRB 060413: Watcher UBVR observations
  73. GRB 060413: XRT refined analysis
  74. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  75. GRB 060413: Swift detection of a burst
  76. GRB060403: optical observations
  77. GRB 060403 Optical observations
  78. GRB 060403: MITSuME optical observation
  79. GRB060403: XRT refined analysis
  80. GRB 060403: Swift/UVOT upper limits
  81. GRB 060403: Refined analysis of the Swift-BAT burst
  82. GRB 060403: Swift detection of a burst
  83. GRB 060322: LNA optical limit
  84. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  85. GRB 060323 : WIDGET simultaneous optical observations
  86. GRB 060323: Early optical observation at Xinglong
  87. GRB060218, optical observations
  88. GRB 060322: Confirmation of Swift XRT afterglow
  89. GRB 060211A: optical observation
  90. GRB060323: optical limit
  91. GRB060211B: optical observation
  92. GRB060323: NOT optical observations
  93. GRB 060322: IAC80 optical observations
  94. GRB 060322: Swift XRT afterglow candidate
  95. GRB 060323: Swift/UVOT Observations
  96. GRB 060323: optical afterglow confirmed
  97. GRB060323: NOT observations
  98. GRB 060323: Optical Observations
  99. GRB 060323: Tautenburg OT candidate retraction
  100. GRB 060323: Refined analysis of the Swift-BAT 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