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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"

5544 results found.

  1. GRB 140320B: ISON-NM optical observations
  2. GRB 140320B: A long GRB detected by INTEGRAL
  3. GRB 140320B: FTN optical afterglow candidate
  4. GRB 140318A: Swift detection of a burst
  5. IPN Triangulation of GRB 140306A
  6. GRB 140302A: Swift detection of a burst
  7. GRB 140301A: Swift detection of a burst
  8. PTF14yb: GROND Transient Detection
  9. iPTF14yb: iPTF Discovery of an Optical Afterglow-like Transient
  10. GRB 140221A: MAXI/GSC detection
  11. GRB 140215A: P60 observations
  12. GRB 140215A: KAIT Optical Detection
  13. GRB140215A: Prompt Observations with Discovery Channel Telescope
  14. GRB 140215A: Swift detection of a burst with optical counterpart
  15. Trigger 586482: Swift detection of GROJ1744-28
  16. GRB 140209A: Fermi GBM observation
  17. GRB 140206A: Optical Observations via Virtual Telescope
  18. GRB 140206A: Swift/UVOT Detection
  19. GRB 140206A: ISON-Ussuriysk optical observations
  20. GRB 140206A: MASTER OT detection
  21. GRB140206A - Optical afterglow candidate
  22. GRB 140206A: Swift detection of a burst
  23. GRB 140129B: MASTER OT early light curve
  24. GRB 140129A: MITSuME Okayama upper limits
  25. GRB 140129B: Swift detection of a burst with an optical afterglow
  26. Konus-Wind observation of GRB 131215A
  27. GRB 140103A: MASTER-Net early OT detection
  28. GRB 140104B: Further Swift XRT observations
  29. GRB 140108A: Mondy optical upper limit
  30. GRB 140108A: Swift detection of a burst
  31. GRB 140102A: Swift detection of a burst with optical counterpart
  32. GRB 131229A: Swift detection of a burst
  33. GRB 131225A: MAXI/GSC detection
  34. GRB 131215A: MAXI/GSC detection
  35. GRB 131209A: Swift XRT and UVOT observations
  36. GRB 131209A: Fermi GBM observation
  37. IPN Triangulation of GRB 131209A
  38. GRB131205A : GROND Observations
  39. GRB 131205A: Enhanced Swift-XRT position
  40. GRB 131205A: Swift detection of a burst
  41. GRB 131127B: archival confirmation of iPTF13ecv as a CV
  42. GRB 131202A: Swift detection of a burst
  43. GRB 131127A: Swift detection of a burst
  44. GRB 131030A, Optical Observations
  45. GRB 131117A: Swift/UVOT Detection
  46. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  47. GRB 131030A: MITSuME Akeno Optical observation
  48. GRB 131108A: CARMA 3mm detection
  49. GRB 131108A: Swift/UVOT Detection
  50. GRB 131108A: TAROT-Calern optical observation
  51. GRB 131108A: Fermi-LAT refined analysis
  52. GRB 131108A: NOT optical observations
  53. GRB 131105A: Swift detection of a burst
  54. GRB 131103A: Swift detection of a burst
  55. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  56. IPN Triangulation of GRB 131014A
  57. GRB 131018B: Swift-XRT observations
  58. GRB 131018A: Swift detection of a burst
  59. GRB 131014A: Suzaku WAM observation of the prompt emission
  60. Konus-Wind observation of GRB 131014A
  61. GRB 131014A: Fermi-LAT detection
  62. GRB 131014A: Fermi GBM detection
  63. GRB 130930A: Swift detection of a burst
  64. GRB 130831A: Continued RATIR Optical and NIR Observations
  65. GRB 130929A: Swift detection of a burst
  66. Fermi LAT Upper Limits on GRB 130925A
  67. GRB 130925A: optical upper limit
  68. GRB 130925A: Continued RATIR Optical and NIR Observations
  69. GRB 130925A: Fermi GBM Detection
  70. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  71. GRB 130925A: RATIR Optical and NIR Observations
  72. Fermi GBM detection of GRB 130925A and a possible precursor
  73. GRB 130925A: Enhanced Swift-XRT position
  74. GRB 130925A: VLT/X-shooter redshift
  75. GRB 130925A: MAXI/GSC detection
  76. GRB 130925A: GROND afterglow candidate
  77. GRB 130925A: Swift detection of a burst
  78. GRB 130831A: RTT150 optical observations
  79. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  80. GRB 130831A: Maidanak optical observations, possible emerging Supernova
  81. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  82. GRB 130913A detected in ground analysis of Swift-BAT data
  83. GRB 130912A: RATIR Optical and NIR Upper Limits
  84. GRB 130907A: Continued RATIR Optical and NIR Observations
  85. GRB 130912A: P60 Observations
  86. GRB 130907A: MASTER refined analysis
  87. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  88. GRB 130907A: Continued RATIR Optical and NIR Observations
  89. GRB 130907A: RATIR Optical and NIR Observations
  90. GRB 130828A: Further Swift XRT observations
  91. GRB 130907A: INTEGRAL/SPI-ACS light curve
  92. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  93. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  94. GRB 130831A: Maidanak optical observations
  95. GRB 130831A: optical observation in Chuguev AO
  96. GRB 130907A: MASTER early OT observations
  97. GRB 130831A: RATIR Optical and NIR Upper Limits
  98. GRB 130903A: GROND Afterglow Discovery
  99. GRB 130903A: MASTER early optical limit
  100. GRB 130903A: ISON-Kislovodsk optical Upper Limits

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