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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"

28259 results found.

  1. GRB 131014A: NOT afterglow candidate
  2. GRB 131014A: Nanshan optical observations
  3. GRB 131014A: Swift detection of a possible X-ray afterglow
  4. GRB 131014A Tiled Swift observations
  5. GRB 131014A: Fermi-LAT detection
  6. GRB 131014A: Fermi GBM detection
  7. GRB 131011A: Fermi GBM detection
  8. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  9. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  10. GRB 131011A: GROND afterglow observations
  11. Fermi403206457: continued P60 observations and fading behavior
  12. Fermi403206457: Weihai optical upper limit
  13. Fermi403206457: NOT optical observations
  14. Fermi403206457: iPTF detection of a possible optical afterglow
  15. Trigger 574266 is not a Swift detection of a known source
  16. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  17. GRB 130831A: Continued RATIR Optical and NIR Observations
  18. GRB 130831A: VLT/FORS2 spectroscopic detection of a supernova
  19. GRB 131004A: Correction to XRT refined analysis
  20. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  21. GRB 131004A: CARMA 93 GHz upper limit
  22. GRB 131004A: Swift/UVOT Detection
  23. GRB 131004A: RATIR Optical and NIR Upper Limits
  24. GRB 131004A: Swift-XRT refined Analysis
  25. GRB131004A: TNG Redshift confirmation
  26. GRB 131004A: GROND observations of the afterglow
  27. GRB 131004A: Enhanced Swift-XRT position
  28. GRB131004A: Magellan Redshift
  29. GRB 131004A: Liverpool Telescope optical afterglow observations
  30. GRB 131004A: TNG optical afterglow confirmation
  31. GRB 131004A: optical afterglow from the NOT
  32. GRB 131004A: Swift detection of a burst (may be short)
  33. GRB 130925A: 3mm observations with CARMA
  34. GRB 130925A/Sw J0244-2609: mm observations at PdBI
  35. GRB 131002B: GROND upper limits
  36. GRB 131002B: Swift-XRT Refined Analysis
  37. GRB 131002B: Swift/UVOT Upper Limits
  38. GRB 131002A: Swift/UVOT Detection
  39. GRB 131002A: Swift-XRT refined Analysis
  40. GRB 131002B: Enhanced Swift-XRT position
  41. GRB 131001A: Swift UVOT and XRT Upper Limits
  42. GRB 131002A: Enhanced Swift-XRT position
  43. NuSTAR observations of GRB 130925A
  44. GRB 131002B: Swift detection of a burst
  45. GRB 131002A: Swift detection of a burst
  46. GRB 131002A: Faulkes Telescope North optical afterglow
  47. GRB 131001A detected in ground analysis of Swift-BAT data
  48. GRB 130925A: continuing Swift/XRT monitoring
  49. Swift Operations in the event of a US Government shutdown
  50. GRB 130930A: Swift detection of a burst
  51. GRB 130929A: Swift/UVOT Upper Limits
  52. GRB 130831A: Continued RATIR Optical and NIR Observations
  53. GRB 130929A: Swift-XRT refined Analysis
  54. GRB 130929A: Enhanced Swift-XRT position
  55. GRB 130929A: Swift detection of a burst
  56. GRB 130925A: Swift/UVOT Detection of the Host Galaxy
  57. GRB 130925A: Swift/UVOT Upper Limits
  58. GRB 130925A: sub-mm non-detection with SMA
  59. GRB 130925A: optical upper limit
  60. GRB 130925A: Continued RATIR Optical and NIR Observations
  61. GRB 130925A: Fermi GBM Detection
  62. Konus-Wind observation of GRB 130925A
  63. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  64. GRB 130925A: RATIR Optical and NIR Observations
  65. GRB 130925A Swift-BAT refined analysis
  66. GRB 130925A: Historical non-detection from Rosat-HRI
  67. Fermi GBM detection of GRB 130925A and a possible precursor
  68. GRB 130925A: Swift-XRT refined Analysis
  69. GRB 130925A: Initial Similarities to Swift J1644+57
  70. GRB 130925A: TAROT La Silla observatory optical observations
  71. GRB 130925A: Enhanced Swift-XRT position
  72. GRB 130925A: VLT/X-shooter redshift
  73. GRB 130925A: VLT/UVES observations
  74. GRB 130925A: MAXI/GSC detection
  75. GRB 130925A: GROND afterglow candidate
  76. GRB 130925A: Swift detection of a burst
  77. GRB 130831A: RTT150 optical observations
  78. GRB 130702A: RTT150 optical observations
  79. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  80. GRB 130912A: AAO optical upper limit
  81. GRB 130831A: Maidanak optical observations, possible emerging Supernova
  82. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  83. GRB 130919A: Swift detection of a burst
  84. GRB 130903A: Further Swift XRT observations.
  85. GRB 130606A: Chandra observation
  86. GRB 130912A: Swift/UVOT Upper Limits
  87. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  88. GRB 130912A: 5.8 GHz VLA upper limit
  89. GRB 130912A: RATIR Optical and NIR Upper Limits
  90. Konus-Wind observation of GRB 130912A
  91. GRB 130912A: P60 Observations
  92. GRB 130912A: Swift-XRT refined Analysis
  93. GRB 130912A: Fermi GBM detection
  94. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  95. GRB 130912A: Enhanced Swift-XRT position
  96. GRB 130912A: REM optical/NIR upper limits
  97. GRB 130912A: GROND observations
  98. GRB 130912A: KAIT optical upper limit
  99. GRB 130912A: Swift detection of a short burst
  100. GRB 130907A: AMI radio detection

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