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"

36104 results found.

  1. Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
  2. GRB 071227: Suzaku WAM observation of the prompt emission
  3. GRB 071227: optical afterglow
  4. Further Swift-BAT analysis of GRB 071227
  5. Konus-Wind observation of GRB 071227
  6. GRB 071227: Magellan redshift confirmation
  7. GRB 071227: Swift-XRT refined analysis
  8. GRB 071227: VLT probable redshift of the candidate host galaxy
  9. GRB 071227: Magellan observations
  10. GRB 071227: REM NIR and Optical observations
  11. Swift-BAT refined analysis of short GRB 071227
  12. GRB 071227: Swift detection of a burst
  13. GRB071020: optical observations
  14. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  15. Swift-BAT trigger 298308 is not a GRB
  16. GRB 071208?: Swift detection of a possible burst
  17. IBAS Alert #4772 in not a GRB
  18. GRB 071125: Suzaku WAM observation of the prompt emission
  19. GRB 070429B: Probable host galaxy and redshift
  20. GRB 071129, Swift-BAT refined analysis
  21. GRB 071129: Swift detection of a burst
  22. Konus-Wind and Konus-A observations of GRB 071125
  23. IPN triangulation of very bright GRB 071125
  24. GRB 071112C: Optical/NIR observations
  25. Disregard the "GRB 071126" position
  26. GRB 071126: Enhanced Swift-XRT position
  27. VLA radio detection of GRB 071122
  28. GRB071122: Swift/UVOT Observations
  29. GRB071104: NIR Afterglow Candidate at TNG
  30. GRB 071122: MASTER optical observation
  31. GRB 071122, Swift-BAT refined analysis
  32. GRB 071122 Swift XRT position update sent in error.
  33. GRB 071122 Swift-XRT refined analysis
  34. GRB 071122: Corrected P60 Coordinates
  35. GRB071122: Gemini Absorption redshift
  36. GRB 071122: P60 Optical Afterglow Candidate
  37. GRB 071122: ROTSE-III Optical Limits
  38. GRB 071122: Swift detection of a burst
  39. GRB 071118: P60 Observations
  40. GRB071118 MITSuME OAO optical observation
  41. GRB 071118: Observations from OSN
  42. GRB 071117: VLT observations and probable redshift
  43. Swift/UVOT observations of GRB071118
  44. GRB 071117: Swift-XRT revised position
  45. Konus-Wind and Konus-A observations of GRB 071117
  46. Swift XRT follow-up observations of GRB071008
  47. Swift/UVOT upper limits for GRB 071117
  48. GRB071118: Swift XRT refined analysis
  49. GRB 071117: Gemini Optical Afterglow Discovery
  50. GRB 071118, Swift-BAT refined analysis
  51. GRB 071117: TAROT La Silla observatory optical observations
  52. GRB 071112B: Gemini Image Differencing
  53. GRB 071118: Swift detection of a burst
  54. GRB 071117: Gemini Observations
  55. GRB 071117: Las Campanas optical observations
  56. GRB 071117: Swift-XRT refined analysis
  57. GRB 071117, Swift-BAT refined analysis
  58. VLT FORS2 observations of short hard GRB071112B
  59. GRB 071117: Swift/XRT position
  60. GRB 071117: Initial Swift/UVOT observations
  61. GRB 071117: Swift detection of a bright burst
  62. VLA radio upper limit on GRB 071112C
  63. ATCA radio observations of short hard burst GRB 071112B
  64. GRB 071112C: Optical and NIR data observed with KANATA
  65. GRB 071112C: WSRT Radio Observations
  66. GRB 071112C: optical observation
  67. GRB 071112C: optical observation
  68. GRB 071112C: emission lines and refined VLT redshift
  69. GRB 071112C MITSuME Akeno early optical observation
  70. GRB 071112C: Gemini Absorption Redshift
  71. GRB 071112B: 2nd epoch of Magellan i-band imaging
  72. GRB 071112C: SARA upper limit
  73. GRB 071112C : Second Epoch Lulin R-band observations
  74. GRB071112C MITSuME Okayama Optical Observation
  75. GRB 071112C: Swift-BAT refined analysis
  76. GRB 071112C: Swift/UVOT observations
  77. GRB 071112C: Swift XRT refined analysis
  78. GRB 071112C: Optical observations at Crni Vrh
  79. Swift UVOT upper limits of GRB071112B
  80. GRB 071112C: VLT redshift
  81. GRB 071112B: Magellan i-band imaging
  82. GRB 071112B: Gemini Optical Imaging (Correction)
  83. GRB 071112B: Gemini Optical Imaging
  84. GRB 071112B: Swift-XRT preliminary analysis
  85. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  86. GRB071112C: NOT observations
  87. GRB 071112C: Palomar Pre-Imaging
  88. Swift-BAT trigger 296491 is not a GRB
  89. GRB 071112C : Lulin R-band observation
  90. GRB 071112C: RTT150 optical observations
  91. GRB 071112C: TAROT Calern observatory optical observations
  92. Swift XRT follow-up observations of GRB071028B
  93. GRB 071112C: Optical and NIR afterglows observed with KANATA
  94. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  95. GRB 071112B: ROTSE-III Rapid Optical Limits
  96. GRB 071112C: Swift detection of a burst with an optical counterpart
  97. GRB 071112B: Swift detection of a short hard burst
  98. GRB 071112: Swift detection of a possible burst
  99. VLA IInd observation of INTEGRAL burst GRB 071109
  100. Swift/UVOT initial analysis of GRB071109

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