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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"

28275 results found.

  1. GRB 111020A: Swift-XRT refined Analysis
  2. GRB 111020A: Swift/UVOT Upper Limits
  3. GRB 111020A: Faulkes Telescope South observations
  4. GRB 111020A: Swift-BAT refined analysis
  5. GRB 111020A: Enhanced Swift-XRT position
  6. GRB 111020A: BOOTES-3 Optical Upper Limit.
  7. GRB 111020A: Swift detection of a short burst
  8. GRB 111018A: Swift/UVOT Upper Limits
  9. GRB 111018A: Swift-BAT refined analysis
  10. GRB 111018A: Swift-XRT refined Analysis
  11. GRB 111018A: GROND Upper Limits
  12. GRB 111018A: Enhanced Swift-XRT position
  13. IPN Triangulation of GRB 111016B (long duration, intense)
  14. GRB111016A : WIYN 3.5m NIR observations
  15. GRB 111018A: Swift detection of a burst
  16. GRB 111017A: Fermi GBM Detection
  17. GRB111016A: D50 optical limit
  18. GRB 111016A: Gemini Detection of the NIR Counterpart
  19. GRB 111016A: Swift/UVOT Detection of a Source
  20. GRB 111016A: Swift-BAT refined analysis
  21. GRB 111016A: P60 Afterglow Candidate
  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: Swift/UVOT Upper Limits
  28. GRB 111008A: IAC80 I-band observations
  29. GRB 111008A: Swift-XRT refined Analysis
  30. GRB 111008A, GROND observations
  31. GRB 111008A: NOT optical observation
  32. GRB 111008A: Gemini optical counterpart
  33. GRB 111008A: Enhanced Swift-XRT position
  34. GRB 111008A, Swift-BAT refined analysis,
  35. GRB 111008A: Swift detection of a burst
  36. GRB 111005A: ATCA 18 GHz detection
  37. GRB 111005A: ATCA radio upper limit
  38. GRB 111005A : miniTAO/ANIR NIR observations
  39. GRB 111005A: GROND NIR observations
  40. GRB 111005A: VLT IR observations
  41. GRB 111005A: Swift-BAT refined analysis
  42. GRB 111005A: Swift detection of a burst
  43. GRB 111003A: Fermi GBM detection
  44. GRB 110921A: MITSuME-Akeno Optical photometry
  45. Skynet/Dolomiti observations of GRB 110928A
  46. Skynet observations of GRB 110928A
  47. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  48. GRB 110928A: Swift/UVOT Upper Limits
  49. GRB 110928A: Swift-XRT refined Analysis
  50. GRB 110825A: GROND Observations
  51. GRB 110928A: Enhanced Swift-XRT position
  52. GRB 110928A: P60 Observations
  53. GRB 110928A: Further PAIRITEL NIR Observations
  54. GRB 110928A: Swift-BAT refined analysis
  55. GRB 110928A: Swift-XRT observations
  56. GRB 110928A: Swift/UVOT finding chart observation
  57. GRB 110928A: PAIRITEL NIR Observations
  58. GRB 110928A: ROTSE-III Optical Limits
  59. GRB 110924A: Swift detection of a possible burst
  60. GCN for GRB 110921B
  61. GRB 110921A: Swift/UVOT Observations
  62. GRB 110921A: NOT observations
  63. GRB 110921A: Fermi GBM observation
  64. GRB 110921A: TNT astrometry
  65. GRB 110921A: Swift-XRT refined Analysis
  66. GRB 110921A, Swift-BAT refined analysis
  67. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  68. GRB 110921A: Enhanced Swift-XRT position
  69. GRB 110918A: Swift-XRT refined Analysis
  70. GRB 110921A: Swift detection of a burst
  71. GRB 110915B : X-ray afterglow confirmation
  72. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  73. GRB 110918A optical observation
  74. GRB 110918A: GROND detection of the afterglow candidate
  75. GRB 110918A: INT optical detection of Swift candidate afterglow
  76. GRB 110918A: Swift-XRT observations
  77. GRB110918A: BOOTES-1 optical limit
  78. Swift detection of short bursts from PSR J1647-4552
  79. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  80. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  81. GRB 110915A: Swift/UVOT Upper Limits
  82. GRB 110915B: Swift/UVOT Upper Limits
  83. GRB 110915A: GROND Upper limits
  84. GRB 110915A, Swift-BAT refined analysis
  85. GRB 110915A: Swift-XRT refined Analysis
  86. GRB 110915B: Afterglow candidate from OSN
  87. GRB 110915A: Deep Near-IR Limits from Magellan
  88. GRB 110915B: XRT afterglow candidate
  89. GRB 110903A: Suzaku WAM observation of the prompt emission
  90. GRB 110915A: Deep Gemini-South i/z-band imaging
  91. GRB110915A MITSuME Okayama J-band upper-limit
  92. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  93. GRB 110915A: NOT observations
  94. GRB 110915A: 1.23m CAHA I-band observations
  95. GRB 110915B: SuperAGILE localization of a long GRB
  96. GRB 110915A: Enhanced Swift-XRT position
  97. GRB 110915A: GMG optical upper limit
  98. GRB 110915A: MASTER-Net early limit
  99. GRB 110915A: Swift detection of a burst
  100. GRB 110825A: Further Swift/XRT Observations

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