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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"

37292 results found.

  1. GRB 111020A: Enhanced Swift-XRT position
  2. GRB 111020A: BOOTES-3 Optical Upper Limit.
  3. GRB 111020A: Planned XMM-Newton observation
  4. GRB 111020A: Swift detection of a short burst
  5. GRB 111018A: Swift/UVOT Upper Limits
  6. GRB 110918A: Optical light curve for days 1.4 to 16.3
  7. GRB 111018A: Swift-BAT refined analysis
  8. Konus-Wind observation of GRB 111016B
  9. GRB 111018A: Swift-XRT refined Analysis
  10. GRB 111018A: GROND Upper Limits
  11. GRB 111018A: Enhanced Swift-XRT position
  12. IPN Triangulation of GRB 111016B (long duration, intense)
  13. GRB111016A : WIYN 3.5m NIR observations
  14. GRB 111018A: Swift detection of a burst
  15. GRB 111017A: Fermi GBM Detection
  16. GRB111016A: D50 optical limit
  17. GRB 111016A: Gemini Detection of the NIR Counterpart
  18. GRB 111016A: Swift/UVOT Detection of a Source
  19. GRB 111016A: Swift-BAT refined analysis
  20. GRB 111016A: P60 Afterglow Candidate
  21. GRB 111016A: MITSuME Akeno Optical upper limits
  22. GRB 111016A: Swift-XRT refined Analysis
  23. GRB 111016A: Enhanced Swift-XRT position
  24. GRB 111016A: Swift-XRT observations
  25. GRB 111016A: Swift detection of a burst
  26. GRB 110921A: optical observations
  27. GRB 111008A : miniTAO/ANIR NIR observations
  28. EVLA 22 GHz Detection of GRB 111008A
  29. GRB 111005A: ATCA 18 GHz decay
  30. GRB 111008A: Swift/UVOT Upper Limits
  31. Konus-Wind observation of GRB 111008A
  32. GRB 111008A: IAC80 I-band observations
  33. GRB 111008A: VLT/X-shooter spectroscopy
  34. GRB 111008A: Swift-XRT refined Analysis
  35. GRB 111008A: Gemini spectroscopic redshift
  36. GRB 111008A, GROND observations
  37. GRB 111008A: NOT optical observation
  38. GRB 111008A: Gemini optical counterpart
  39. GRB 111008A: Enhanced Swift-XRT position
  40. GRB 111008A, Swift-BAT refined analysis,
  41. GRB 111008A: Swift detection of a burst
  42. GRB 111005A: ATCA 18 GHz detection
  43. GRB 111005A: ATCA radio upper limit
  44. GRB 111005A : miniTAO/ANIR NIR observations
  45. GRB 111005A: EVLA Observations
  46. GRB 111005A: VLT optical observations
  47. GRB 111005A: GROND NIR observations
  48. GRB 111005A: VLT IR observations
  49. GRB 111005A: Swift-BAT refined analysis
  50. GRB 111005A: bright galaxy in error circle
  51. GRB 111005A: Swift detection of a burst
  52. GRB 111003A: Fermi GBM detection
  53. GRB 110905A / MAXI J1836-194: optical monitoring
  54. GRB 110921A: MITSuME-Akeno Optical photometry
  55. Skynet/Dolomiti observations of GRB 110928A
  56. Skynet observations of GRB 110928A
  57. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  58. GRB 110928A: Swift/UVOT Upper Limits
  59. GRB 110928A: Swift-XRT refined Analysis
  60. GRB 110825A: GROND Observations
  61. GRB 110928A: Enhanced Swift-XRT position
  62. GRB 110928A: P60 Observations
  63. GRB 110928A: Further PAIRITEL NIR Observations
  64. GRB 110928A: Swift-BAT refined analysis
  65. GRB 110928A: Swift-XRT observations
  66. GRB 110928A: Swift/UVOT finding chart observation
  67. GRB 110928A: PAIRITEL NIR Observations
  68. GRB 110928A: ROTSE-III Optical Limits
  69. GRB 110928A: Swift detection of a burst
  70. GRB 110924A: Swift detection of a possible burst
  71. GCN for GRB 110921B
  72. GRB 110921A: Swift/UVOT Observations
  73. GRB110918A: Lick Observations
  74. GRB 110921A: NOT observations
  75. GRB 110921A: Fermi GBM observation
  76. GRB 110921A: TNT astrometry
  77. GRB 110921A: Swift-XRT refined Analysis
  78. GRB 110921A, Swift-BAT refined analysis
  79. GRB 110918A: Liverpool Telescope optical observations
  80. GRB 110918A: submm observations from APEX
  81. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  82. GRB 110921A: Enhanced Swift-XRT position
  83. GRB 110921A: MITSuME Akeno Optical Observation
  84. GRB 110921A : TNT optical counterpart candidate
  85. GRB 110918A: Swift-XRT refined Analysis
  86. GRB 110918A: Spectroscopy from GTC
  87. GRB 110921A: MASTER-Net early limit
  88. GRB 110921A: Swift detection of a burst
  89. GRB 110915B : X-ray afterglow confirmation
  90. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  91. GRB 110918A: rest-frame energetics in gamma-gays
  92. GRB 110918A optical observation
  93. GRB 110918A: Gemini-N redshift
  94. GRB 110918A: Afterglow Confirmation from PTF
  95. GRB 110918A: GROND detection of the afterglow candidate
  96. GRB 110918A: INT optical detection of Swift candidate afterglow
  97. GRB 110918A: Swift-XRT observations
  98. GRB 110918A: pseudo-z= from prompt emission spectrum
  99. Konus-Wind observation of GRB 110918A
  100. Swift detection of short bursts from PSR J1647-4552

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