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"

37682 results found.

  1. GRB 121031A: Swift/UVOT Upper Limits
  2. GRB 121031A: Swift-XRT refined Analysis
  3. GRB 121102A: Enhanced Swift-XRT position
  4. GRB 121031A: Enhanced Swift-XRT position
  5. GRB 121102A: Swift-XRT refined Analysis
  6. GRB 121102A: Swift-BAT refined analysis
  7. GRB 121025A: Confirmation of the X-ray afterglow
  8. GRB 121029A Suzaku WAM observation of the prompt emission
  9. GRB 121102A : a long GRB detected by INTEGRAL
  10. GRB 121102A: Swift detection of a burst
  11. GRB 121027A: sub-mm upper limit
  12. GRB 121031A: Swift-BAT refined analysis
  13. GRB 121031A: Prompt enhanced Swift-XRT position
  14. GRB 121031A: Swift detection of a burst
  15. GRB 121027A: Swift/UVOT Possible Detection
  16. GRB 121024A: LOAO RIzY Observation
  17. GRB 121027A: X-shooter redshift confirmation
  18. GRB 121027A - Gemini South spectroscopy
  19. GRB 121024A: SMARTS optical/IR afterglow observations
  20. GRB 121028A: near-IR observations at Calar Alto
  21. GRB 121027A: GROND Confirmation of Rebrightening
  22. GRB 121029A: Fermi GBM detection
  23. GRB 121028A: RAPTOR Limits During Gamma-Ray Emitting Interval
  24. GRB 121027A: MASTER early prompt optical limit
  25. GRB 121027A: Swift-XRT refined Analysis
  26. GRB 121027A: Brightening IR counterpart
  27. GRB 121028A: Swift-XRT refined Analysis
  28. GRB 121028A: Enhanced Swift-XRT position
  29. GRB 121028A: Swift-BAT refined analysis
  30. GRB 121027A: Enhanced Swift-XRT position
  31. GRB 121028A: MITSuME Okayama Optical upper limits
  32. GRB 121028A: Faulkes Telescope North observations
  33. GRB 121028A: Swift detection of a burst
  34. GRB 121011A: optical observations
  35. GRB 121027A: nIR afterglow candidate with AAT
  36. GRB 121027A: Swift-BAT refined analysis
  37. GRB 121025A: Swift-XRT observation
  38. GRB 121027A: MAXI/GSC detection 40 minutes after the Swift Trigger
  39. GRB 121027A: Swift detection of a burst
  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: Swift-BAT refined analysis
  45. GRB 121024A: GMG optical observation
  46. GRB 121024A: MITSuME Ishigakijima upper limits
  47. GRB 121024A: MITSuME Okayama Optical upper limits
  48. GRB 121025A: MAXI/GSC detection
  49. GRB 121024A: Enhanced Swift-XRT position
  50. GRB 121024A: PAIRITEL NIR Detection
  51. GRB 121024A: Swift-XRT refined Analysis
  52. GRB 121024A: GROND Detection of the Optical/NIR Afterglow
  53. GRB 121024A: VLT/X-shooter redshift
  54. GRB 121024A: BOOTES-1B optical detection
  55. GRB 121024A: TAROT Calern observatory optical detection of a bright counterpart
  56. GRB 121024A: Swift detection of a burst with an optical counterpart
  57. GRB 121011A: early optical light curve
  58. GRB 121017A: Swift/UVOT Upper Limits
  59. GRB 121017A: Swift-XRT refined Analysis
  60. GRB 121017A: GROND Observations
  61. GRB 121017A: Swift-BAT refined analysis
  62. GRB 121017A: Enhanced Swift-XRT position
  63. GRB 121017A: 1.23m CAHA R-band observations
  64. GRB 121017A optical observations
  65. GRB 121017A: BOOTES-2/TELMA observations
  66. GRB 121017A: Swift detection of a burst
  67. GRB 121011B: Suzaku WAM observation of the prompt emission
  68. GRB 121011A Suzaku WAM observation of the prompt emission
  69. GRB 121012A: Fermi GBM detection
  70. PdB IRAM observation of GRB 121011A
  71. Konus-Wind observation of GRB 121011B
  72. GRB 121014A: Swift-BAT refined analysis
  73. GRB 121011A: WSRT radio observation
  74. GRB 121014A: Swift detection of a burst
  75. INTEGRAL Alert n.6678: NOT A GRB
  76. GRB 121011A: optical observations
  77. GRB 121011A: Swift/UVOT Detection
  78. IPN Triangulation of short hard GRB 121011B
  79. GRB 121011A: NOT redshift retraction
  80. GRB 121011A: misprint in GCNC 13854
  81. GRB 121011A: Fermi GBM observation
  82. GRB 121011A: Fermi-LAT detection of a burst
  83. GRB 121011A: Swift-XRT refined Analysis
  84. GRB 121011A: NOT optical observations
  85. GRB 121011A: optical observations
  86. GRB 121011A: MASTER-Net bell light curve
  87. GRB 121011A: TNG optical observations
  88. GRB 121011A, Swift-BAT refined analysis
  89. GRB 121011A: Enhanced Swift-XRT position
  90. Planned XMM-Newton and IRAM observation of GRB 121011A
  91. GRB 121011A: MASTER-Net early OT light curve
  92. GRB 121011A: MITSuME Okayama Optical Observation
  93. GRB 121011A: Swift detection of a burst with optical afterglow
  94. GRB 120927A: optical upper limit
  95. GRB 120804A: Late-time Chandra observation
  96. GRB 121001A: GROND Afterglow Confirmation
  97. GRB 121001A: Swift/UVOT Upper Limits
  98. GRB 121001A: Swift-XRT refined Analysis
  99. GRB 121001A: Enhanced Swift-XRT Position
  100. Swift Trigger 535026 is GRB 121001A: Swift-BAT 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