Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20456 results found.

  1. GRB 121201A: BOOTES-4 optical observations
  2. GRB 121128A: optical observation in Mondy observatory
  3. GRB 121128A: WSRT radio observation
  4. GRB 121128A: Swift/UVOT Detection
  5. GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
  6. GRB 121128A, Swift-BAT refined analysis
  7. GRB 121123A: Swift/UVOT Observations
  8. GRB 121125A: Swift/UVOT Detection
  9. GRB 121125A: LOAO Observation
  10. GRB 121125A: MASTER-NET optical observations
  11. GRB 121123A: GROND observations
  12. GRB 121123A: optical observations
  13. GRB 121123A: BOOTES-4 and IAC80 optical observations
  14. GRB 121123A: NOT optical observations
  15. GRB 121123A: GMG optical observation
  16. GRB 121117A: Optical observations
  17. GRB 121117A: GROND confirmation of the UVOT afterglow candidate
  18. GRB 121117A: Swift/UVOT Observations
  19. GRB 121117A: MASTER prompt optical limit
  20. Swift trigger 538575: Magellan Observations
  21. GRB 121108A: Swift/UVOT Upper Limits
  22. GRB 121108A : Lulin/TRIPOL2 Optical Limits
  23. GRB 121108A: Optical observations
  24. GRB 121108A: Weihai observatory optical observations
  25. GRB 121108A: TAROT Calern observatory optical observations
  26. GRB 121028A: Swift/UVOT Upper Limits
  27. GRB 121102A: Swift/UVOT Upper Limits
  28. GRB 121031A: Swift/UVOT Upper Limits
  29. GRB 121027A: sub-mm upper limit
  30. GRB 121027A: Swift/UVOT Possible Detection
  31. GRB 121027A - Gemini South spectroscopy
  32. GRB 121024A: SMARTS optical/IR afterglow observations
  33. GRB 121028A: near-IR observations at Calar Alto
  34. GRB 121027A: GROND Confirmation of Rebrightening
  35. GRB 121028A: RAPTOR Limits During Gamma-Ray Emitting Interval
  36. GRB 121027A: Swift-XRT refined Analysis
  37. GRB 121028A: Faulkes Telescope North observations
  38. GRB 121011A: optical observations
  39. GRB 121027A: nIR afterglow candidate with AAT
  40. GRB 121024A: optical observations
  41. GRB 121024A: EVLA Detection
  42. GRB 121024A: Swift/UVOT Observations
  43. GRB 121024A: CARMA 3mm Detection
  44. GRB 121024A: GMG optical observation
  45. GRB 121025A: MAXI/GSC detection
  46. GRB 121024A: PAIRITEL NIR Detection
  47. GRB 121024A: GROND Detection of the Optical/NIR Afterglow
  48. GRB 121024A: VLT/X-shooter redshift
  49. Skynet PROMPT/Dolomiti observations of GRB121024A
  50. GRB 121024A: BOOTES-1B optical detection
  51. GRB 121024A: TAROT Calern observatory optical detection of a bright counterpart
  52. GRB 121017A: Swift/UVOT Upper Limits
  53. GRB 121017A: GROND Observations
  54. GRB 121017A: 1.23m CAHA R-band observations
  55. GRB 121017A optical observations
  56. GRB 121017A: BOOTES-2/TELMA observations
  57. PdB IRAM observation of GRB 121011A
  58. GRB 121011A: WSRT radio observation
  59. GRB 121011A: optical observations
  60. GRB 121011A: Swift/UVOT Detection
  61. GRB 121011A: NOT optical observations
  62. GRB 121011A: optical observations
  63. GRB 121011A: TNG optical observations
  64. Planned XMM-Newton and IRAM observation of GRB 121011A
  65. GRB 120804A: Late-time Chandra observation
  66. GRB 121001A: GROND Afterglow Confirmation
  67. GRB 121001A: Swift/UVOT Upper Limits
  68. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  69. GRB 121001A: MASTER optical observations
  70. Swift Trigger 535026: ROTSE-III Optical Limits
  71. GRB 120927A: Swift/UVOT Upper Limits
  72. GRB 120927A: GROND upper limits
  73. Further Swift-XRT observations of the GRB 120919A field.
  74. GRB 120923A: RAPTOR Early Afterglow Limits
  75. GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
  76. GRB 120923A: CARMA Observations
  77. GRB 120923A: EVLA Observations
  78. GRB 120923A: GROND Upper limits
  79. GRB 120922A: Swift/UVOT Detection
  80. GRB 120923A: Swift/UVOT Upper Limit
  81. GRB 120922A: Swift/UVOT Observations
  82. GRB 120923A: Gemini afterglow detection, high-z candidate
  83. GRB 120922A: TAROT La Silla observatory optical observations
  84. GRB 120923A: TAROT La Silla observatory optical observations
  85. GRB 120922A: GROND afterglow candidate
  86. GRB 120919B: MASTER prompt optical observations
  87. GRB 120919A: Swift/UVOT Upper Limits
  88. GRB 120919A: Swift-XRT observations
  89. Swift Transient Swift J174510.8-262411: Swift-BAT refined analysis
  90. GRB 120913B: FRAM early follow up and detection
  91. GRB 120913B: REM NIR early time detection
  92. Continued Skynet/PROMPT observations of GRB120913B
  93. GRB 120913B: TAROT La Silla observatory optical photometry
  94. GRB 120913B: TAROT La Silla observatory optical detection
  95. Skynet/PROMPT observations of GRB120913B
  96. GRB 120907A: optical observations of ISON-Kislovodsk
  97. GRB 120911B: Fermi-LAT detection of a burst
  98. GRB 120911A: Swift/UVOT Upper Limits
  99. GRB 120911A: Faulkes Telescope North observations
  100. GRB 120911A: Swift-XRT observations

Advanced

Download all Circulars as a .tar.gz archive:
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