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"

32568 results found.

  1. GRB 071003: MARGE Observations
  2. GRB 071003 Optical observations
  3. GRB 071003: P60 Confirmation of Optical Afterglow
  4. GRB 071003: KAIT optical afterglow observations
  5. GRB 070714B: host galaxy spectroscopic redshift
  6. GRB 071001: Swift-XRT Team refined analysis
  7. GRB 071001, Swift-BAT refined analysis
  8. Faulkes Telescope South observations of GRB 071001
  9. VLA observation of GRB 070923
  10. Disregard the Swift-XRT Notices today
  11. GRB 070911, SMARTS optical/IR afterglow observations
  12. GRB070925: Swift-XRT Afterglow confirmation
  13. GRB 070925: Gemini South Imaging
  14. GRB070925: Swift-XRT Position
  15. Update on Swift Status
  16. GRB 070920B: ROTSE-III Early Optical Limits
  17. Recent SGR1806-20 Activity
  18. GRB 070923, Swift-BAT refined analysis
  19. GRB 070920B: XRT observations
  20. GRB 070923: Galaxies within BAT localization
  21. GRB 070917: Suzaku/WAM observation of the prompt emission
  22. INTEGRAL ToO observations of SGR1806-20
  23. GRB 070920b, SMARTS optical observation
  24. GRB 070917: Confirmation of the X-ray afterglow
  25. GRB 070920b: LCO optical observations
  26. GRB 070920B, Swift-BAT refined analysis
  27. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  28. GRB 070920, Swift-BAT refined analysis
  29. SGR1806-20: Swift-BAT detection of enhanced activity
  30. GRB070917: Confirmation of optical afterglow
  31. GRB920925C: search for host galaxy
  32. GRB070917: optical observations
  33. GRB 070917: P60 Observations
  34. Konus-Wind observation of GRB 070917
  35. Swift Status and XRT Calibration Uncertainties
  36. GRB 070917: Swift-XRT observations
  37. GRB 070917: KAIT optical limits
  38. GRB 070917: MITSuME Akeno Ic upper limit
  39. GRB 070917: R band observations
  40. GRB 070917, Swift-BAT refined analysis
  41. GRB 070911: Suzaku WAM observation of the prompt emission
  42. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  43. GRB 070809: The Swift evidence for the SHB nature of this burst
  44. GRB 070913: Swift-BAT refined analysis
  45. GRB 070913: Corrected BAT position
  46. GRB 070913: SMARTS optical/IR observations
  47. GRB 070911: PAIRITEL IR Observations
  48. GRB 070911: Swift XRT refined analysis
  49. GRB 070911, Swift-BAT refined analysis
  50. IPN search for a GRB associated with TAROT transient on August 31
  51. Intense burst from SGR 1806-20 detected on September 7
  52. GRB 070809: Confirmation of optical transient
  53. Observations of possible TAROT GRB transient near IC 4779
  54. GRB 070810b: Image Subtraction of Multiple Keck Observations
  55. Las Campanas observations of possible TAROT GRB transient near IC
  56. Konus-Wind observation of GRB 070824
  57. Konus-Wind observation of very bright GRB 070821
  58. GRB 070731: Swift/UVOT Upper Limit
  59. GRB 070805: UVOT afterglow candidate retraction
  60. GRB070810b: optical candidate
  61. GRB 070810A: ROTSE-III Refined Analysis
  62. GRB 061110A: redshift confirmed
  63. GRB 070810B : Faulkes Telescope South Observations
  64. GRB 070810A: Continued Keck Imaging
  65. GRB 070810B: Keck spectroscopy of possible host galaxies
  66. GRB070810B: Swift/UVOT Upper Limits
  67. GRB 070810B: XRT refined analysis
  68. GRB 070810B, Swift-BAT refined analysis
  69. GRB 070809: Swift/UVOT Corrected Photometry
  70. Swift Trigger 287421: False trigger due to star tracker loss
  71. GRB 070810A: Swift-BAT refined analysis
  72. GRB 070810B: Xinglong TNT optical Upper Limit
  73. GRB070810B: Optical observations with KANATA
  74. GRB 070809: Swift/UVOT Upper Limits
  75. VLA upper limit on the short hard burst GRB 070729
  76. GRB 070810: Keck redshift and photometry
  77. No radio detection in superAGILE burst 070724B
  78. GRB 070809: Keck Imaging
  79. GRB 070810: Swift-XRT Team Refined Analysis
  80. GRB 070809: Swift-XRT refined analysis
  81. GRB 070810: Swift/UVOT Optical Counterpart
  82. GRB 070809, Swift-BAT refined analysis
  83. GRB 070809: Optical Pre-imaging from Palomar
  84. GRB 070808: Swift/UVOT upper limits
  85. GRB 070809: ROTSE-III Optical Limits
  86. GRB 070808 : Faulkes Telescope South Observations
  87. GCN Swift XRT update position notices and enhanced position circulars
  88. GRB 070808: Swift XRT refined analysis
  89. GRB 070808, Swift-BAT refined analysis
  90. GRB 070808: OPTIMA-Burst optical upper limit
  91. GRB 070808: Xinglong TNT optical Upper Limit
  92. GRB070808: Optical observations with KANATA
  93. GRB 070808: ROTSE-III Optical Limits
  94. GRB061121A: PROMPT Observations
  95. GRB070805 XRT and UVOT afterglow candidate
  96. GRB070612A: Radio upper limit from GMRT
  97. GRB 070721B: correct afterglow position
  98. Swift/UVOT observations of GRB070805
  99. GRB 070805, Swift-BAT refined analysis
  100. GRB 070805: Swift XRT initial analysis.

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