Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

32769 results found.

  1. Short GRB 060502B: Tautenburg Observation
  2. GRB 060427B Milagro GeV/TeV Observations
  3. GRB 060502A: TTT Observations
  4. GRB060502B: correction to XRT position
  5. GRB 060501: P60 Observations and Candidate Retraction
  6. GRB 060502B: Xinglong optical observation
  7. GRB060502: Swift-XRT refined analysis
  8. GRB 060502: Swift-BAT refined analysis
  9. GRB060502: Gemini spectroscopy
  10. GRB 060502: APO Spectroscopic Observations
  11. GRB060501: Swift UVOT followup observations
  12. GRB060502: Super-LOTIS Observations
  13. GRB 060502: P60 Afterglow Confirmation
  14. GRB 060501: MDM Observations
  15. GRB060501: Super-LOTIS observations
  16. GRB060501: P60 imaging and afterglow candidate
  17. GRB 060501: Refined analysis of the Swift-BAT burst
  18. GRB 060501: ROTSE-III Optical Limits
  19. Konus-Wind observation of GRB 060427B
  20. GRB060428B - SDSS Pre-Burst Observations
  21. GRB060428B: optical observation
  22. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  23. GRB 060428B: MDM Observations
  24. GRB 060428A: PROMPT Observations
  25. GRB060428B: Swift XRT Team refined analysis
  26. GRB 060428B: Refined analysis of the Swift-BAT burst
  27. GRB 060428B: Xinglong I-band limit
  28. GRB 060428B: KAIT observations
  29. GRB 051117A: Bright host galaxy not confirmed
  30. GRB060428A: Swift/UVOT observations.
  31. GRB060428B, optical observation
  32. GRB 060428A: Refined analysis of the Swift-BAT burst
  33. GRB 060428b : Kiso R-band limit
  34. GRB 060428b: Optical afterglow candidate
  35. GRB060428A: Swift XRT Team refined analysis
  36. GRB 060427: NIR observations
  37. GRB060427: Xinglong optical Observations
  38. GRB 060427: Swift/UVOT upper limits.
  39. GRB 060427: Refined analysis of the Swift-BAT burst
  40. GRB060427: Swift XRT Team refined analysis
  41. GRB060418: Swift XRT Team Further Refined Analysis
  42. GRB 060427, optical observation
  43. GRB060424: optical afterglow detection
  44. GRB060418: Further Analysis of MIKE Spectroscopy
  45. GRB 060424: Refined analysis of the Swift-BAT burst
  46. GRB 060421: TTT Observations
  47. OT 060420: Likely Not a New Cosmic Transient
  48. No OT 060420 in MASCOT images
  49. GRB060421: Swift/UVOT observations
  50. GRB 060421: Swift-BAT Refined Analysis
  51. GRB 060421: Swift-XRT refined analysis
  52. GRB 060418: prediction of t_break
  53. GRB060418: optical observations
  54. Konus-Wind observation of GRB 060418
  55. Possible GRB060421: BART limits
  56. Erratum of GCN 4983 for GRB 060418 IR follow-up
  57. GRB 060418 : IR afterglow observations
  58. GRB 060418 : Lulin Optical follow-up
  59. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  60. GRB 060418: Radio Observations
  61. GRB060418, BVRcIc field calibration
  62. GRB060418: Swift/UVOT Observations
  63. GRB060418: Optical Observations
  64. GRB 060418: FRAM early afterglow observation
  65. GRB 060418: Refined Analysis of the Swift-BAT burst
  66. VLT/UVES observations of GRB060418
  67. GRB 060418, SMARTS continuing afterglow observations
  68. GRB 060418: PROMPT Detections
  69. GRB 060418, SMARTS optical/IR afterglow observations
  70. GRB060418: Magellan/MIKE Spectroscopic Redshift
  71. GRB060418 : LT optical afterglow observation
  72. GRB 060418: REM candidate afterglow
  73. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  74. GRB060413: Swift/UVOT upper limits
  75. GRB 060413: REM NIR Observations
  76. GRB 060413: Refined analysis of the Swift-BAT burst
  77. GRB 060413: Watcher UBVR observations
  78. GRB 060413: XRT refined analysis
  79. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  80. GRB 060413: Swift detection of a burst
  81. GRB060403: optical observations
  82. GRB 060403 Optical observations
  83. GRB 060403: MITSuME optical observation
  84. GRB060403: Optical Limit
  85. GRB060403: XRT refined analysis
  86. GRB 060403: Swift/UVOT upper limits
  87. SGR 1900+14: BAT observations
  88. GRB 060403: Refined analysis of the Swift-BAT burst
  89. GRB060403: Swift XRT refined position
  90. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  91. HETE trigger H4044: RTT150 optical observations
  92. GRB060331: Swift/UVOT upper limits
  93. H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
  94. Swift XRT observations of the HETE transient H4043
  95. HETE Trigger 4043: ROTSE-III Optical Limits
  96. H4043, an unusual high-energy transient observed by HETE
  97. GRB 060322: LNA optical limit
  98. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  99. INTEGRAL and XMM ToO observations of SGR1900+14
  100. GRB 060218SN 2006aj: optical observations at Rozhen Observatory

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