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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"

39494 results found.

  1. GRB 140903A: FTN observations
  2. GRB 140818B: TShAO optical upper limit
  3. GRB 140903A: ISON-Kislovodsk observations
  4. GRB 140903A: MAXI/GSC upper limit
  5. GRB 140903A: 6 GHz VLA detection
  6. GRB 140903A: Pan STARRS images of the field
  7. GRB 140901B: Fermi GBM detection
  8. GRB 140903A: tentative spectroscopic redshift
  9. GRB 140901B found in ground analysis of BAT data
  10. GRB 140903A: Swift/UVOT Upper Limits
  11. GRB 140903A: Swift-BAT Spectral lag analysis
  12. GRB 140903A: P60 Optical Observations
  13. GRB140903A: Discovery Channel Telescope Optical Detection
  14. GRB 140903A: Swift-BAT refined analysis
  15. GRB 140903A: Swift-XRT refined Analysis
  16. GRB 140903A: Coincident galaxy cluster in archival images
  17. GRB 140903A: Confirmed Swift detection of a short burst
  18. GRB 140903A: Preliminary Swift/XRT localization
  19. GRB 140903A: Swift detection of a possible burst
  20. GRB 140901A: Fermi GBM detection
  21. IPN Triangulation of GRB 140901A (short/hard/very intense)
  22. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  23. GRB 140829A: Fermi GBM Detection
  24. GRB 140829A: iPTF optical observations
  25. GRB140818B, the review of the sky area in plate archives
  26. GRB 140828A, Swift-BAT refined analysis
  27. Konus-Wind observation of GRB 140825A
  28. GRB 140828A: Fermi GBM observation
  29. Swift Mission Operations Center Fully Operational
  30. IPN Triangulation of GRB 140825A (very intense/long)
  31. GRB 140828A: Swift detection of a burst
  32. IPN Triangulation of GRB 140824B
  33. Swift Burst Response Reenabled
  34. GRB 140818B: TLS observations
  35. GRB 140824A: optical upper limit in CrAO
  36. GRB 140824B: Swift observations
  37. Fermi TRIGGER_NUM 430645968: MASTER OT inside error box
  38. Swift Mission Operations Center Moving Tomorrow
  39. GRB 140824B: Fermi GBM Detection
  40. GRB 140821A: Fermi GBM Detection
  41. Fermi TRIGGER_NUM 430583595: MASTER OT 20 hours later
  42. Fermi TRIGGER_NUM 430583595: MASTER OT JR011101.13+603337.5 detection
  43. GRB 140824A: NOT optical upper limits
  44. GRB 140824A: OSN optical limit
  45. GRB 140824A: Swift-XRT refined Analysis
  46. GRB 140824A: Swift-BAT refined analysis
  47. GRB 140824A: Enhanced Swift-XRT position
  48. GRB 140824A: MITSuME Ishigakijima upper limits
  49. GRB 140824A: Swift/UVOT Upper Limits
  50. GRB 140824A: Swift detection of a burst
  51. GRB 140817A: NOT optical observations
  52. Fermi GBM Trigger 140819576/ 430148973/ MASTER OT
  53. GRB 140817A: Khureltogot optical upper limit
  54. GRB 140818B: ISON-Kislovodsk and ISON-Burakan optical upper limit
  55. Fermi trigger 430148973: Swift-XRT observation
  56. GRB 140818A: GROND confirmation of afterglow candidate
  57. GRB 140808A/iPTF14eag: AMI 15 GHz detection
  58. GRB140819A: Deep GROND Upper Limits
  59. GRB 140818B, Swift-BAT refined analysis
  60. Fermi trigg_num 430148973: bright OT inside large error box!
  61. Konus-Wind observation of GRB 140818A
  62. GRB 140818B : Correction to GCN 16713
  63. GRB 140818B: Swift/UVOT Upper Limits
  64. GRB 140818B: Swift-XRT refined Analysis
  65. Radio upper limit on the GRB 140808A with the GMRT
  66. GRB 140818B: Fermi GBM detection
  67. GRB140818B : GROND afterglow candidate
  68. GRB 140818B: Enhanced Swift-XRT position
  69. GRB 140818B: OSN I-band afterglow candidate
  70. GRB 140817A: Swift/UVOT Afterglow Detection
  71. GRB 140818B: Swift detection of a burst
  72. GRB 140818A - Fermi GBM Detection
  73. Swift detection of SAX J1712.6-3739
  74. GRB 140818A: Swift-XRT and UVOT potential afterglow detection
  75. GRB 140818A: Correction to GCN 16702
  76. Konus-Wind observation of GRB 140817A
  77. GRB 140818A Tiled Swift observations
  78. GRB 140818A: MAXI/GSC detection
  79. GRB 140817A: Swift-XRT refined Analysis
  80. GRB 140817A: Fermi GBM Detection
  81. GRB 140817A: Swift-BAT refined analysis
  82. GRB 140817A draft circular on nearby galaxy
  83. GRB 140817A: Enhanced Swift-XRT position
  84. GRB 140817A: Swift-XRT position
  85. GRB 140817A: Swift detection of a burst
  86. GRB 140808A / PTFeag: VLA K-band observations
  87. GRB 140815A: GROND afterglow candidate
  88. Swift Trigger 609694 is probably not an astrophysical source
  89. GRB 140815A: Swift-XRT observations
  90. GRB 140815A: A long GRB detected by INTEGRAL
  91. GRB 140814A: Swift-XRT and UVOT observations
  92. GRB 140814A: MASTER optical follow-up inspection
  93. GRB 140814A: Swift-XRT and UVOT observations
  94. GRB 140814A: MAXI/GSC detection
  95. Swift Mission Operations Center Moving
  96. GRB 140808A / iPTF14eag optical follow-up at HCT
  97. IPN triangulation of GRB 140810A
  98. GRB 140808A: Confirmation of the Swift-XRT afterglow
  99. GRB140809A: Fermi GBM observation
  100. GRB 140810A: Fermi GBM observation

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