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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"

43623 results found.

  1. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  2. GRB 130831A: Continued RATIR Optical and NIR Observations
  3. GRB 130831A: VLT/FORS2 spectroscopic detection of a supernova
  4. GRB 131004A: MOSFIRE NIR imaging
  5. GRB 131004A: Correction to XRT refined analysis
  6. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  7. GRB 131004A, Swift-BAT refined analysis
  8. GRB 131004A: Fermi GBM observation
  9. GRB 131004A: CARMA 93 GHz upper limit
  10. GRB 131004A: Swift/UVOT Detection
  11. GRB 131004A: RATIR Optical and NIR Upper Limits
  12. GRB 131004A: Swift-XRT refined Analysis
  13. GRB131004A: TNG Redshift confirmation
  14. GRB 131004A: GROND observations of the afterglow
  15. GRB 131004A: Enhanced Swift-XRT position
  16. GRB131004A: Magellan Redshift
  17. GRB 131004A: Liverpool Telescope optical afterglow observations
  18. GRB 131004A: TNG optical afterglow confirmation
  19. GRB 131004A: optical afterglow from the NOT
  20. GRB 131004A: Swift detection of a burst (may be short)
  21. GRB 131002A, Swift-BAT refined analysis
  22. GRB 130925A: 3mm observations with CARMA
  23. GRB 131002A: Fermi GBM observation
  24. GRB 130925A/Sw J0244-2609: mm observations at PdBI
  25. GRB 131002B, Swift-BAT refined analysis
  26. GRB 131002B: GROND upper limits
  27. GRB 131002B: Swift-XRT Refined Analysis
  28. GRB 131002B: Swift/UVOT Upper Limits
  29. GRB 131002A: Swift/UVOT Detection
  30. GRB 131001A, Swift-BAT refined analysis
  31. GRB 131002A: Swift-XRT refined Analysis
  32. GRB 131002B: Enhanced Swift-XRT position
  33. GRB 131002A: ISON-NM optical observations
  34. Swift J1242.9-3530, Swift-BAT refined analysis
  35. GRB 131001A: Swift UVOT and XRT Upper Limits
  36. GRB 131002A: Enhanced Swift-XRT position
  37. NuSTAR observations of GRB 130925A
  38. Fermi Gamma-ray Burst Monitor trigger 402405063 / 131002466 is not a GRB
  39. GRB 131002B: Swift detection of a burst
  40. GRB 131002A: Swift detection of a burst
  41. GRB 131002A: Faulkes Telescope North optical afterglow
  42. GRB 131001A detected in ground analysis of Swift-BAT data
  43. GRB 130925A: continuing Swift/XRT monitoring
  44. Swift Operations in the event of a US Government shutdown
  45. IPN Observations of GRB 130925A
  46. US Government shutdown may impact GRB operation of GCN
  47. GRB 130930A: Swift detection of a burst
  48. GRB 130831A: Continued RATIR Optical and NIR Observations
  49. GRB 130929A: Swift-XRT refined Analysis
  50. GRB 130929A, Swift-BAT refined analysis
  51. GRB 130929A: Enhanced Swift-XRT position
  52. GRB 130929A: TAROT La Silla observatory optical observations
  53. GRB 130929A: Swift detection of a burst
  54. Fermi LAT Upper Limits on GRB 130925A
  55. GRB 130925A: Swift/UVOT Detection of the Host Galaxy
  56. GRB 130925A: Swift/UVOT Upper Limits
  57. GRB 130925A: sub-mm non-detection with SMA
  58. GRB 130925A: optical upper limit
  59. GRB 130925A: Continued RATIR Optical and NIR Observations
  60. GRB 130925A: Fermi GBM Detection
  61. Konus-Wind observation of GRB 130925A
  62. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  63. GRB 130925A: RATIR Optical and NIR Observations
  64. GRB 130925A Swift-BAT refined analysis
  65. GRB 130925A: Historical non-detection from Rosat-HRI
  66. Fermi GBM detection of GRB 130925A and a possible precursor
  67. GRB 130925A: Swift-XRT refined Analysis
  68. GRB 130925A: Initial Similarities to Swift J1644+57
  69. GRB 130925A: TAROT La Silla observatory optical observations
  70. GRB 130925A: Enhanced Swift-XRT position
  71. GRB 130925A: VLT/X-shooter redshift
  72. GRB 130925A: VLT/UVES observations
  73. GRB 130925A: MAXI/GSC detection
  74. GRB 130925A: GROND afterglow candidate
  75. GRB 130925A: Swift detection of a burst
  76. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  77. GRB 130702A: RTT150 optical observations
  78. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  79. GRB 130903A: optical observations
  80. GRB 130907A: Maidanak optical observations
  81. GRB 130912A: AAO optical upper limit
  82. Fermi Trigger 401326696: MASTER prompt optical observations
  83. GRB 130831A: Maidanak optical observations, possible emerging Supernova
  84. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  85. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  86. GRB 130919A, Swift-BAT refined analysis
  87. GRB 130913A detected in ground analysis of Swift-BAT data
  88. GRB 130919A: Swift detection of a burst
  89. GRB 130903A: Further Swift XRT observations.
  90. GRB 130606A: Chandra observation
  91. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  92. GRB 130912A: 5.8 GHz VLA upper limit
  93. GRB 130912A: RATIR Optical and NIR Upper Limits
  94. Konus-Wind observation of GRB 130912A
  95. GRB 130912A: WHT confirmation of optical counterpart
  96. GRB 130907A: Continued RATIR Optical and NIR Observations
  97. GRB 130912A: P60 Observations
  98. GRB 130912A: Swift-XRT refined Analysis
  99. GRB 130907A: MASTER refined analysis
  100. GRB 130912A: Fermi GBM detection

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