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"

42816 results found.

  1. GRB 120219A: MASTER prompt and early optical limit and OT discussion
  2. GRB 120219A: 1.23m CAHA optical observations
  3. GCN 12974 : Errata in the Subject
  4. GRB 120219A, optical observations
  5. GRB120219A: Keck Observations
  6. GRB 120219A: Swift-XRT refined Analysis
  7. GRB 120219A: Swift/UVOT Upper Limits
  8. GRB 120219A: Swift-BAT refined analysis
  9. GRB 120219A: Enhanced Swift-XRT position
  10. GRB120219A: TNT optical afterglow candidates
  11. GRB 120219A: MASTER-NET prompt and early optical observations
  12. GRB 120219A: Swift detection of a burst
  13. GRB 120218A: Swift-BAT refined analysis
  14. GRB 120218A: Swift detection of a burst
  15. GRB 120215A: Swift/UVOT Upper Limits
  16. GRB 120215A: Swift-XRT refined Analysis
  17. Fermi GBM detection of an SGR-like burst
  18. GRB 120215A: Enhanced Swift-XRT position
  19. Skynet/PROMPT observations of GRB120215A
  20. GRB 120215A: Swift-BAT refined analysis
  21. GRB 120215A: Swift detection of a burst
  22. GRB 120211A : LOAO optical observations
  23. GRB 120213A: Swift-XRT refined Analysis
  24. GRB 120212A: Fermi GBM observation
  25. GRB 120212A: GMG optical observation
  26. GRB 120213A: Enhanced Swift-XRT position
  27. GRB 120213A: Swift-BAT refined analysis
  28. GRB 120213A: MASTER-NET early optical observations
  29. GRB 120213A: Prompt enhanced Swift-XRT position
  30. GRB 120212A: Swift-XRT refined Analysis
  31. GRB 120213A: Swift detection of a burst
  32. GRB 120212A: NOT optical observation
  33. GRB 120212A: Swift/UVOT Detection
  34. GRB 120212A: Swift-BAT refined analysis
  35. GRB 120212A: Errata of subject in GCNC 12936
  36. GRB 120212A: Enhanced Swift-XRT position
  37. GRB 120211A: MITSuME Okayama Ks-band Observation
  38. GRB 120212A: Kanata/HOWPol optical observation
  39. GRB 120212A: Swift-XRT observations
  40. GRB 120212A: Swift/UVOT detection
  41. GRB 120212A: Faulkes Telescope South afterglow candidate
  42. GRB 120211A: GROND Upper limits
  43. GRB 120212A: Swift detection of a burst
  44. GRB 120211A, optical observations
  45. GRB 120211A: Swift-XRT refined Analysis
  46. GRB 120211A: MASTER early optical observations
  47. GRB 120211A: Swift-BAT refined analysis
  48. GRB 120211A: MITSuME Okayama Ks-band upper limit
  49. GRB 120211A: Enhanced Swift-XRT position
  50. GRB 120211A - Faulkes Telescope South Observations
  51. GRB 120211A: Swift detection of a burst
  52. GRB 120202A: MASTER early optical observations
  53. LS I +61 303: Swift-BAT refined analysis
  54. Swift detection of a burst from LS I +61 303
  55. GRB 120202A: GROND observations
  56. GRB 120202A: WHT, Gemini & UKIRT candidate afterglow
  57. GRB 120202A: Swift/XRT and UVOT observations
  58. GRB 120202A: TAROT Calern observatory optical observations
  59. GRB 120202A: A long GRB detected by INTEGRAL
  60. GRB 111228A: Possible host detected by Swift/UVOT
  61. GRB 120129A: MASTER optical observations
  62. Konus-Wind observation of GRB 120129A
  63. IPN Triangulation of GRB 120129A (long/intense)
  64. GRB 120127A / P48 Imaging
  65. GRB 120127A: MASTER optical observations
  66. GRB 120127A: MAXI/GSC detection of a probable GRB
  67. GRB 120118B: optical upper limit
  68. GRB 120116A: optical upper limit
  69. GRB 120119A : LOAO Optical Observations
  70. Fermi GBM trigger 120123.169 is not a GRB
  71. GRB 120119A: EVLA observations
  72. GRB 120119A: GRT detection of early afterglow
  73. GRB 111225A: optical observations
  74. GRB 120119A: optical upper limit
  75. GRB 120121A: Swift-XRT refined Analysis
  76. GRB 120121A: Swift-BAT refined analysis
  77. GRB 120121A: Enhanced Swift-XRT position
  78. GRB 120121A: ISON-NM optical observations
  79. GRB 120121A: Swift detection of a burst
  80. GRB 120119A, Swift-BAT refined analysis
  81. GRB 120119A: TAROT La Silla observatory optical observations
  82. GRB120119A: REM NIR observations
  83. GRB 120119A: optical observations
  84. GRB 120119A: Swift/UVOT Observations
  85. GRB 120118B: RTT150 optical observations
  86. GRB 120119A: SMARTS optical/IR afterglow observations
  87. GRB 120119A: Swift-XRT refined Analysis
  88. GRB 120119A: Enhanced Swift-XRT position
  89. GRB 120119A: Fermi GBM observation
  90. GRB 120118B, Swift-BAT refined analysis
  91. Konus-Wind observation of GRB 120119A
  92. GRB 120119A: optical observations
  93. GRB 120118B: TNG NIR observations
  94. GRB 120118B: Swift-XRT refined Analysis
  95. GRB 120119A: MMT redshift confirmation
  96. GRB 120119A: Lick 3m Spectroscopy
  97. GRB 120119A: Gemini-S redshift
  98. GRB 120119A: PROMPT optical observation of early afterglow
  99. GRB 120119A: GROND Detection of the Optical/NIR Afterglow
  100. GRB 120119A: Liverpool Telescope afterglow detection

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