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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"

42539 results found.

  1. GRB 131018B: Swift/UVOT Upper Limits
  2. GRB 131018B: Swift-XRT observations
  3. GRB 131018B: Fermi GBM observation
  4. GRB 131018A: RATIR Optical and NIR Observations
  5. GRB 131018A: Swift/UVOT Upper Limits
  6. GRB 131018B: Fermi-LAT detection of a burst
  7. GRB 131018A: Swift-XRT refined Analysis
  8. GRB 131018A: KAIT Optical Upper Limit
  9. GRB 131018A, Swift-BAT refined analysis
  10. GRB 131018A: P60 Observations
  11. GRB 131018A: Enhanced Swift-XRT position
  12. GRB 131014A: XRT position information
  13. GRB131018A, optical observations
  14. GRB 131018A: Swift detection of a burst
  15. GRB 131014A: Suzaku WAM observation of the prompt emission
  16. GRB 131014A: GROND observations
  17. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  18. Fermi GBM data availability during U.S. government shutdown
  19. GRB 131014A: Swift-XRT refined Analysis
  20. GRB 131011A: Swift/UVOT Upper Limits
  21. GRB 131014A: Swift/UVOT Upper Limits
  22. Fermi 403206457 / GRB 131011A: AAO optical observations
  23. GRB 131014A: RATIR Optical and NIR Observations
  24. GRB 131014A: Enhanced XRT position
  25. Konus-Wind observation of GRB 131014A
  26. GRB 131014A: NOT afterglow candidate
  27. GRB 131014A: Nanshan optical observations
  28. GRB 131014A: Swift detection of a possible X-ray afterglow
  29. GRB 131014A Tiled Swift observations
  30. GRB 131014A: Fermi-LAT detection
  31. GRB 131014A: Fermi GBM detection
  32. GRB 131011A: Fermi GBM detection
  33. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  34. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  35. GRB 131011A: GROND afterglow observations
  36. Fermi403206457: continued P60 observations and fading behavior
  37. Fermi403206457: Weihai optical upper limit
  38. Fermi403206457: NOT optical observations
  39. Fermi403206457: iPTF detection of a possible optical afterglow
  40. Trigger 574266 is not a Swift detection of a known source
  41. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  42. GRB 130831A: Continued RATIR Optical and NIR Observations
  43. GRB 130831A: VLT/FORS2 spectroscopic detection of a supernova
  44. GRB 131004A: MOSFIRE NIR imaging
  45. GRB 131004A: Correction to XRT refined analysis
  46. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  47. GRB 131004A, Swift-BAT refined analysis
  48. GRB 131004A: Fermi GBM observation
  49. GRB 131004A: CARMA 93 GHz upper limit
  50. GRB 131004A: Swift/UVOT Detection
  51. GRB 131004A: RATIR Optical and NIR Upper Limits
  52. GRB 131004A: Swift-XRT refined Analysis
  53. GRB131004A: TNG Redshift confirmation
  54. GRB 131004A: GROND observations of the afterglow
  55. GRB 131004A: Enhanced Swift-XRT position
  56. GRB131004A: Magellan Redshift
  57. GRB 131004A: Liverpool Telescope optical afterglow observations
  58. GRB 131004A: TNG optical afterglow confirmation
  59. GRB 131004A: optical afterglow from the NOT
  60. GRB 131004A: Swift detection of a burst (may be short)
  61. GRB 131002A, Swift-BAT refined analysis
  62. GRB 130925A: 3mm observations with CARMA
  63. GRB 131002A: Fermi GBM observation
  64. GRB 130925A/Sw J0244-2609: mm observations at PdBI
  65. GRB 131002B, Swift-BAT refined analysis
  66. GRB 131002B: GROND upper limits
  67. GRB 131002B: Swift-XRT Refined Analysis
  68. GRB 131002B: Swift/UVOT Upper Limits
  69. GRB 131002A: Swift/UVOT Detection
  70. GRB 131001A, Swift-BAT refined analysis
  71. GRB 131002A: Swift-XRT refined Analysis
  72. GRB 131002B: Enhanced Swift-XRT position
  73. GRB 131002A: ISON-NM optical observations
  74. Swift J1242.9-3530, Swift-BAT refined analysis
  75. GRB 131001A: Swift UVOT and XRT Upper Limits
  76. GRB 131002A: Enhanced Swift-XRT position
  77. NuSTAR observations of GRB 130925A
  78. GRB 131002B: Swift detection of a burst
  79. GRB 131002A: Swift detection of a burst
  80. GRB 131002A: Faulkes Telescope North optical afterglow
  81. GRB 131001A detected in ground analysis of Swift-BAT data
  82. GRB 130925A: continuing Swift/XRT monitoring
  83. IPN Observations of GRB 130925A
  84. GRB 130930A: Swift detection of a burst
  85. GRB 130929A: Swift/UVOT Upper Limits
  86. GRB 130831A: Continued RATIR Optical and NIR Observations
  87. GRB 130929A: Swift-XRT refined Analysis
  88. GRB 130929A, Swift-BAT refined analysis
  89. GRB 130929A: Enhanced Swift-XRT position
  90. GRB 130929A: TAROT La Silla observatory optical observations
  91. GRB 130929A: Swift detection of a burst
  92. Fermi LAT Upper Limits on GRB 130925A
  93. GRB 130925A: Swift/UVOT Detection of the Host Galaxy
  94. GRB 130925A: Swift/UVOT Upper Limits
  95. GRB 130925A: sub-mm non-detection with SMA
  96. GRB 130925A: optical upper limit
  97. GRB 130925A: Continued RATIR Optical and NIR Observations
  98. GRB 130925A: Fermi GBM Detection
  99. Konus-Wind observation of GRB 130925A
  100. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes

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