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"

37697 results found.

  1. GRB 071001: Swift detection of a burst
  2. VLA observation of GRB 070923
  3. GRB 070911, SMARTS optical/IR afterglow observations
  4. GRB070925: Swift-XRT Afterglow confirmation
  5. GRB 070925: Gemini South Imaging
  6. GRB070925: Swift-XRT Position
  7. GRB 070920B: ROTSE-III Early Optical Limits
  8. GRB 070925: a long GRB detected by INTEGRAL
  9. Recent SGR1806-20 Activity
  10. GRB 070923, Swift-BAT refined analysis
  11. GRB 070920B: XRT observations
  12. GRB 070923: Galaxies within BAT localization
  13. GRB 070923: Swift detection of a short hard burst
  14. GRB 070917: Suzaku/WAM observation of the prompt emission
  15. GRB 070920B: TAROT La Silla observatory optical observations
  16. GRB 070920b, SMARTS optical observation
  17. GRB 070917: Confirmation of the X-ray afterglow
  18. GRB 070920b: LCO optical observations
  19. GRB 070920B, Swift-BAT refined analysis
  20. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  21. GRB 070920B: NOT optical observations
  22. GRB 070920B: Swift detection of a burst
  23. GRB 070920, Swift-BAT refined analysis
  24. GRB 070920: TAROT Calern observatory optical observations
  25. GRB 070920: Swift detection of a burst
  26. GRB070917: Confirmation of optical afterglow
  27. GRB920925C: search for host galaxy
  28. GRB070917: optical observations
  29. GRB 070917: P60 Observations
  30. GRB 070917: pseudo-z= 2.40 from prompt emission spectrum
  31. Konus-Wind observation of GRB 070917
  32. Swift Status and XRT Calibration Uncertainties
  33. GRB 070917: Swift-XRT observations
  34. GRB 070917: KAIT optical limits
  35. GRB 070917: MITSuME Akeno Ic upper limit
  36. GRB 070917: R band observations
  37. GRB 070917, Swift-BAT refined analysis
  38. GRB 070917: Swift detection of a bright burst
  39. GRB 070911: Suzaku WAM observation of the prompt emission
  40. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  41. GRB 070809: The Swift evidence for the SHB nature of this burst
  42. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  43. GRB 070913: Swift-BAT refined analysis
  44. GRB 070913: Corrected BAT position
  45. GRB 070913: SMARTS optical/IR observations
  46. GRB 070913: TAROT La Silla observatory optical observations
  47. GRB 070913: Swift detection of a burst
  48. GRB 070911: PAIRITEL IR Observations
  49. GRB 070911: Swift XRT refined analysis
  50. GRB 070911, Swift-BAT refined analysis
  51. GRB 070911: Swift detection of a burst
  52. IPN search for a GRB associated with TAROT transient on August 31
  53. Intense burst from SGR 1806-20 detected on September 7
  54. GRB 070809: Confirmation of optical transient
  55. Observations of possible TAROT GRB transient near IC 4779
  56. Candidate Orphan GRB Optical Transient in IC 4779
  57. GRB 070810b: Image Subtraction of Multiple Keck Observations
  58. Las Campanas observations of possible TAROT GRB transient near IC
  59. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  60. Konus-Wind observation of GRB 070824
  61. GRB 070824 - Combined SuperAGILE/IPN Localization
  62. Konus-Wind observation of very bright GRB 070821
  63. GRB 070731: Swift/UVOT Upper Limit
  64. IPN Localization of GRB 070821 (long, very bright)
  65. GRB 070805: UVOT afterglow candidate retraction
  66. GRB070810b: optical candidate
  67. GRB 070810A: ROTSE-III Refined Analysis
  68. GRB 061110A: redshift confirmed
  69. GRB 070810B : Faulkes Telescope South Observations
  70. GRB 070810A: Continued Keck Imaging
  71. GRB 070810B: Keck spectroscopy of possible host galaxies
  72. GRB070810B: Swift/UVOT Upper Limits
  73. GRB 070810B: XRT refined analysis
  74. GRB 070810B, Swift-BAT refined analysis
  75. GRB 070810: MASTER optical observation
  76. GRB 070809: Swift/UVOT Corrected Photometry
  77. Swift Alert 070810.8: MASTER optical observation
  78. Swift Trigger 287421: False trigger due to star tracker loss
  79. GRB 070810A: Swift-BAT refined analysis
  80. GRB 070810B: Xinglong TNT optical Upper Limit
  81. GRB070810B: Optical observations with KANATA
  82. GRB 070809: Swift/UVOT Upper Limits
  83. GRB 070810B: Swift detection of a short burst
  84. VLA upper limit on the short hard burst GRB 070729
  85. GRB 070810: Keck redshift and photometry
  86. No radio detection in superAGILE burst 070724B
  87. GRB 070809: Keck Imaging
  88. GRB 070810: Swift-XRT Team Refined Analysis
  89. GRB 070809: Swift-XRT refined analysis
  90. GRB 070810: enhanced Swift-XRT position
  91. GRB 070810: Swift/UVOT Optical Counterpart
  92. GRB 070810: ROTSE-III Detection of Optical Counterpart
  93. GRB 070810: Swift detection of a burst
  94. GRB 070809, Swift-BAT refined analysis
  95. GRB 070809: Optical Pre-imaging from Palomar
  96. GRB 070808: Swift/UVOT upper limits
  97. GRB 070809: ROTSE-III Optical Limits
  98. GRB 070809: Swift detection of a short burst
  99. GRB 070808 : Faulkes Telescope South Observations
  100. GRB 070808: Swift XRT refined 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