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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"

37351 results found.

  1. GRB 131018A, Swift-BAT refined analysis
  2. GRB 131018A: P60 Observations
  3. GRB 131018A: Enhanced Swift-XRT position
  4. GRB 131014A: XRT position information
  5. GRB131018A, optical observations
  6. GRB 131018A: Swift detection of a burst
  7. GRB 131014A: Suzaku WAM observation of the prompt emission
  8. GRB 131014A: GROND observations
  9. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  10. Fermi GBM data availability during U.S. government shutdown
  11. GRB 131014A: Swift-XRT refined Analysis
  12. GRB 131011A: Swift/UVOT Upper Limits
  13. GRB 131014A: Swift/UVOT Upper Limits
  14. Fermi 403206457 / GRB 131011A: AAO optical observations
  15. GRB 131014A: RATIR Optical and NIR Observations
  16. GRB 131014A: Enhanced XRT position
  17. Konus-Wind observation of GRB 131014A
  18. GRB 131014A: NOT afterglow candidate
  19. GRB 131014A: Nanshan optical observations
  20. GRB 131014A: Swift detection of a possible X-ray afterglow
  21. GRB 131014A Tiled Swift observations
  22. GRB 131014A: Fermi-LAT detection
  23. GRB 131014A: Fermi GBM detection
  24. GRB 131011A: Fermi GBM detection
  25. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  26. GRB 131011A: GROND afterglow observations
  27. Fermi403206457: continued P60 observations and fading behavior
  28. Fermi403206457: NOT optical observations
  29. Trigger 574266 is not a Swift detection of a known source
  30. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  31. GRB 130831A: Continued RATIR Optical and NIR Observations
  32. GRB 130831A: VLT/FORS2 spectroscopic detection of a supernova
  33. GRB 131004A: MOSFIRE NIR imaging
  34. GRB 131004A: Correction to XRT refined analysis
  35. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  36. GRB 131004A, Swift-BAT refined analysis
  37. GRB 131004A: Fermi GBM observation
  38. GRB 131004A: CARMA 93 GHz upper limit
  39. GRB 131004A: Swift/UVOT Detection
  40. GRB 131004A: RATIR Optical and NIR Upper Limits
  41. GRB 131004A: Swift-XRT refined Analysis
  42. GRB131004A: TNG Redshift confirmation
  43. GRB 131004A: GROND observations of the afterglow
  44. GRB 131004A: Enhanced Swift-XRT position
  45. GRB131004A: Magellan Redshift
  46. GRB 131004A: Liverpool Telescope optical afterglow observations
  47. GRB 131004A: TNG optical afterglow confirmation
  48. GRB 131004A: optical afterglow from the NOT
  49. GRB 131004A: Swift detection of a burst (may be short)
  50. GRB 131002A, Swift-BAT refined analysis
  51. GRB 130925A: 3mm observations with CARMA
  52. GRB 131002A: Fermi GBM observation
  53. GRB 130925A/Sw J0244-2609: mm observations at PdBI
  54. GRB 131002B, Swift-BAT refined analysis
  55. GRB 131002B: GROND upper limits
  56. GRB 131002B: Swift-XRT Refined Analysis
  57. GRB 131002B: Swift/UVOT Upper Limits
  58. GRB 131002A: Swift/UVOT Detection
  59. GRB 131001A, Swift-BAT refined analysis
  60. GRB 131002A: Swift-XRT refined Analysis
  61. GRB 131002B: Enhanced Swift-XRT position
  62. GRB 131002A: ISON-NM optical observations
  63. Swift J1242.9-3530, Swift-BAT refined analysis
  64. GRB 131001A: Swift UVOT and XRT Upper Limits
  65. GRB 131002A: Enhanced Swift-XRT position
  66. NuSTAR observations of GRB 130925A
  67. Fermi Gamma-ray Burst Monitor trigger 402405063 / 131002466 is not a GRB
  68. GRB 131002B: Swift detection of a burst
  69. GRB 131002A: Swift detection of a burst
  70. GRB 131002A: Faulkes Telescope North optical afterglow
  71. GRB 131001A detected in ground analysis of Swift-BAT data
  72. GRB 130925A: continuing Swift/XRT monitoring
  73. Swift Operations in the event of a US Government shutdown
  74. IPN Observations of GRB 130925A
  75. US Government shutdown may impact GRB operation of GCN
  76. GRB 130930A: Swift detection of a burst
  77. GRB 130929A: Swift/UVOT Upper Limits
  78. GRB 130831A: Continued RATIR Optical and NIR Observations
  79. GRB 130929A: Swift-XRT refined Analysis
  80. GRB 130929A, Swift-BAT refined analysis
  81. GRB 130929A: Enhanced Swift-XRT position
  82. GRB 130929A: TAROT La Silla observatory optical observations
  83. GRB 130929A: Swift detection of a burst
  84. Fermi LAT Upper Limits on GRB 130925A
  85. GRB 130925A: Swift/UVOT Detection of the Host Galaxy
  86. GRB 130925A: Swift/UVOT Upper Limits
  87. GRB 130925A: sub-mm non-detection with SMA
  88. GRB 130925A: optical upper limit
  89. GRB 130925A: Continued RATIR Optical and NIR Observations
  90. GRB 130925A: Fermi GBM Detection
  91. Konus-Wind observation of GRB 130925A
  92. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  93. GRB 130925A: RATIR Optical and NIR Observations
  94. GRB 130925A Swift-BAT refined analysis
  95. GRB 130925A: Historical non-detection from Rosat-HRI
  96. Fermi GBM detection of GRB 130925A and a possible precursor
  97. GRB 130925A: Swift-XRT refined Analysis
  98. GRB 130925A: Initial Similarities to Swift J1644+57
  99. GRB 130925A: TAROT La Silla observatory optical observations
  100. GRB 130925A: Enhanced Swift-XRT position

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