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"

27921 results found.

  1. GRB 090429C: Fermi GBM detection
  2. GRB 090429B: Swift/UVOT Upper Limits
  3. GRB 090429A: Swift/UVOT Upper Limits
  4. GRB 090429A: Swift-XRT refined analysis
  5. GRB 090429A: GROND upper limits
  6. GRB 090427C: Fermi GBM detection
  7. GRB 090427B: Fermi GBM detection
  8. GRB 090426C: Fermi GBM detection
  9. GRB 090426B: Fermi GBM detection/observation
  10. GRB 090429B: Swift XRT refined analysis
  11. GRB 090429A: Enhanced Swift-XRT position
  12. GRB 090428B: Fermi GBM detection
  13. GRB 090428: Fermi GBM detection
  14. GRB 090429B: RIMOTS optical upper limits
  15. GRB 090429B: Swift-BAT refined analysis
  16. GRB 090429A: Swift-BAT refined analysis
  17. GRB 090429B: Enhanced Swift-XRT position
  18. GRB 090429A - Correction to XRT position
  19. GRB090429B: Gemini-N infrared IR candidate
  20. GRB 090429B: GROND Observations
  21. GRB 090429B: Swift detection of a burst
  22. GRB 090429: Swift detection of a burst
  23. GRB 090424 : Multiband Optical observation from Nainital
  24. GRB 090423: CARMA mm observations
  25. GRB 090423: millimeter detection
  26. GRB 090426: Swift/BAT spectral lag results
  27. GRB 090425: Fermi GBM detection
  28. GRB 090424: Suzaku WAM observation of the prompt emission
  29. GRB 090426: VLT spectroscopy
  30. GRB 090426: GROND Observations of the Optical/NIR Afterglow
  31. GRB090426 Swift/UVOT observations
  32. GRB 090426: Swift-BAT refined analysis
  33. GRB 090426: Swift-XRT refined analysis
  34. GRB 090423: GROND second epoch imaging and refined SED
  35. Detection of bright radio afterglow of GRB 090424 with the VLA
  36. GRB 090426: Enhanced Swift-XRT position
  37. GRB 090426, RIMOTS optical upper limits
  38. GRB 090426: TNT confimation of optical counterpart
  39. GRB 090426: Swift detection of a burst with an optical counterpart
  40. GRB090424: R-band detection (37.5 hrs post-burst), jet break?
  41. GRB 090424: MASTER-Net prompt optical limit
  42. VLA radio observation of high-z GRB 090423
  43. GRB090424: BVRI/R-band detection after 15 hrs burst
  44. GRB 090424: THO optical observations
  45. GRB 090424: GROND Observations of the Optical/NIR Afterglow
  46. GRB 090423: Swift/BAT spectral lag results
  47. GRB 090424 : TAOS optical detection
  48. GRB 090424 optical observations
  49. GRB 090424: Swift-XRT refined analysis
  50. GRB 090423: energetic, luminosity and jet break
  51. Swift/UVOT observations of GRB 090424
  52. GRB 090424: Enhanced Swift-XRT position
  53. GRB 090424: Swift-BAT refined analysis
  54. GRB 090424: Fermi GBM Observation
  55. GRB 090423: Fermi GBM observation
  56. GRB 090422: Fermi GBM observation
  57. GRB 090423: Ep,i - Eiso correlation
  58. GRB 090424: SDSS Galaxy at the Swift position
  59. GRB 090424: TNT optical observations
  60. GRB 090424: ROTSE-III Confimation of Optical Counterpart
  61. GRB 090424: Swift detection of a burst with an optical counterpart
  62. GRB 090423: Deep z-band upper limit and confirmation of photo-z
  63. GRB 090423: GROND detection and preliminary photo-z
  64. GRB 090423: Correction to NIR photometry
  65. GRB 090423: Swift-XRT refined analysis
  66. GRB090423 - Swift/UVOT upper limits.
  67. GRB 090423: NIR photometry and evidence for spectral break
  68. GRB 090422: Swift-XRT refined analysis
  69. GRB090423, RIMOTS optical upper limits
  70. GRB 090423: Enhanced Swift-XRT position
  71. GRB 090423: Swift-BAT refined analysis
  72. GRB 090422: Swift/UVOT Upper Limits
  73. GRB 090423: Faulkes Telescope South observations
  74. GRB 090418A: R and I band observation
  75. GRB 090423: Swift detection of a burst
  76. GRB 090422: Liverpool Telescope possible candidate
  77. GRB 090418A: Konus-Wind and Swift/BAT joint spectral analysis
  78. GRB 090422: Swift-BAT refined analysis
  79. GRB 090422: Enhanced Swift-XRT position
  80. GRB 090422: Liverpool Telescope observations
  81. GRB 090422: Swift detection of a burst
  82. GRB 090418C: Fermi GBM Detection
  83. GRB 090418A: Swift/UVOT Detection of the Neighbouring Galaxy
  84. Swift-BAT trigger 349718 is not a burst
  85. GRB 090417B: Optical observation
  86. GRB 090418A: optical observations
  87. GRB 090419: Swift/UVOT Observations
  88. GRB 090418B: Faulkes Telescope North observations
  89. GRB 090418A: Swift/UVOT Observations
  90. GRB 090417B: Swift/UVOT Upper Limits
  91. GRB 090417B Correction to the BAT refined analysis position
  92. GRB 090419: Swift-XRT refined analysis
  93. Konus-Wind observation of GRB 090418B
  94. GRB 090419: GROND detection of afterglow candidate
  95. GRB 090419: Swift-BAT refined analysis
  96. VLA radio detection of GRB 090418
  97. VLA radio upper limit on GRB 090417B
  98. GRB 090419: Enhanced Swift-XRT position
  99. GRB 090418: Swift XRT refined analysis
  100. GRB 090418A: ROTSE-III 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