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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"

28303 results found.

  1. GRB 130313A: MASTER-Net optical observations
  2. GRB 130313A: Swift detection of a short burst
  3. IPN Triangulation of GRB 130307A
  4. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  5. GRB 130310A: optical observations
  6. GRB 130306A: Swift Detection of a Possible Afterglow
  7. GRB 130131B: host detection and redshift
  8. GRB 130310A: Fermi-LAT detection and localization
  9. GRB 130306A: MITSuME Ishigakijima upper limits
  10. GRB 130306A: Swift-BAT refined analysis
  11. GRB 130305A BAT refined circular
  12. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  13. GRB 130305A: Gemini-North upper limit
  14. GRB 130307A: Fermi GBM detection
  15. GRB 130305A: Swift/UVOT Upper Limit
  16. GRB 130305A: RATIR Observations
  17. GRB 100615A: HST host detection and X-shooter redshift
  18. GRB 130305A: Swift/XRT detection of the afterglow
  19. GRB 130305A: Fermi GBM observation
  20. GRB 130305A: Fermi LAT Detection
  21. GRB 121128A: optical upper limit in Maidanak observatory
  22. GRB 130216A: Swift/UVOT Upper Limit
  23. GRB 130219A: Suzaku WAM observation of the prompt emission
  24. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  25. Trigger 549841: Swift detection of SGR1806-20
  26. GRB 130216B: Suzaku WAM observation of the prompt emission
  27. GRB 130216A: possible radio counterpart is steady field source
  28. IPN Triangulation of GRB 130219A
  29. GRB 130215A: Suzaku WAM observation of the prompt emission
  30. GRB 130215A: PTF P48 optical detection
  31. GRB 130219A: Fermi GBM detection
  32. GRB 130216A: Further Swift-BAT refined analysis
  33. GRB 130216B: MASTER-Net early observation
  34. GRB 130216A: MASTER-Net early observations
  35. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  36. GRB 130216A: Fermi GBM observation
  37. GRB 130216B: Fermi GBM observation
  38. GRB 130216A: MITSuME Ishigakijima upper limits
  39. GRB 130216B BAT refined analysis
  40. GRB 130216B: P200 NIR Observations
  41. GRB 130216A: P200 NIR Observations
  42. GRB 130216A: Swift-BAT refined analysis
  43. GRB 130216A: TAROT La Silla observatory optical observations
  44. GRB 130215A: Additional P200 NIR observations
  45. GRB 120118B: host observations and redshift determination
  46. GRB 130215A: P200 NIR observations
  47. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  48. GRB 130215A: MITSuME Okayama Optical Observation
  49. GRB 130215A: Fermi GBM detection
  50. GRB 130215A: RAPTOR Measurements
  51. GRB 130215A: GMG optical observation
  52. GRB 130215A: Xinglong optical observations
  53. GRB 130215A: Swift-BAT refined analysis
  54. GRB 130215A: TAROT La Silla observatory optical observations
  55. GRB 130215A: RATIR Optical and NIR Observations
  56. GRB 130215A: REM NIR observations
  57. GRB 130215A: P60 Observations
  58. GRB 130215A: Redshift estimate
  59. Skynet Observations of GRB130215
  60. GRB 130215: ROTSE-III Detection of Optical Counterpart
  61. GRB 130215A: Swift detection of a burst
  62. GRB 130131B: CTIO 0.9-m optical upper-limits
  63. GRB 121128A: optical observations
  64. GRB 121123A: optical observations
  65. GRB 130211A: Swift/UVOT Upper Limits
  66. GRB 130211A: Swift-XRT refined Analysis
  67. GRB 130211A: Swift-BAT refined analysis
  68. GRB 130211A: GROND detection of the afterglow
  69. GRB 130211A: Swift detection of a burst
  70. GRB 130206A: GROND Observations
  71. GRB 130206A: Fermi LAT Observations
  72. GRB 130206A: Fermi GBM observation
  73. GRB 130206A: XRT and UVOT follow-up observations.
  74. GRB 130131B: optical upper limit in Mondy observatory
  75. GRB 130206A, Swift-BAT refined analysis
  76. GRB 130206A: Zadko observatory - Gingin optical observations
  77. Swift GRB 130206A - analysis of Swift/UVOT initial data.
  78. GRB 130206A: Swift-XRT observations
  79. GRB 130131A: optical observation in Mondy observatory
  80. GRB 130131A: Swift/UVOT Upper Limits
  81. GRB 130131B: RATIR Upper Limits
  82. GRB 130131A: RATIR optical and infrared upper limits
  83. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  84. GRB 130131B: Swift-XRT refined Analysis
  85. GRB 130131A - UKIRT confirmation of afterglow
  86. GRB 130131B: VLT/X-shooter acquisition camera limits
  87. GRB 130131B: GROND Upper limits
  88. GRB 130131B: Swift/UVOT Upper Limits
  89. GRB 130131A: Swift-XRT refined Analysis
  90. GRB 130131B: MITSuME Okayama optical upper limits
  91. GRB 130131A: MITSuME Okayama optical upper limits
  92. GRB 130131B: Enhanced Swift-XRT position
  93. GRB 130131B: Swift-BAT refined analysis
  94. GRB 130131A: Swift-BAT refined analysis
  95. GRB 130131B: TAROT Calern observatory optical observations
  96. GRB 130131B: Zadko observatory - Gingin optical observations
  97. GRB 130131A: Enhanced Swift-XRT position
  98. GRB 130131B: Swift detection of a burst
  99. GRB 130131A - Faulkes Telescope North Observations
  100. GRB 130131A - UKIRT afterglow candidate

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