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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"

23561 results found.

  1. GRB 130408A: Enhanced Swift-XRT position
  2. GRB 130408A: GROND detection of the afterglow
  3. GRB 130408A: Swift detection of a burst
  4. GRB 130211A: Retraction of afterglow candidate
  5. Swift detection of IGR J18245-2452
  6. IPN Triangulation of GRB 130320B (very long/bright)
  7. Swift/XRT observation of GRB 130327B
  8. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  9. GRB 130310A: RATIR Observations
  10. Swift Trigger 552142 is a noise event
  11. GRB 130327B: Fermi GBM detection
  12. Swift Trigger 552142: a possible GRB
  13. GRB 130327B: gamma-ray detection by AGILE
  14. GRB 130327A: Gemini Observations
  15. GRB 130327A: Weihai optical obsevations
  16. GRB 130327A: Swift/UVOT Upper Limits
  17. GRB 130327A: ISON-NM optical upper limit
  18. GRB 130327A: Enhanced Swift-XRT position
  19. GRB 130327A: RATIR Optical and NIR Observations
  20. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  21. GRB 130325A: Fermi LAT detection
  22. GRB 130327A: Swift detection of a burst
  23. report: GRB 130315A: Zadko observatory - Gingin optical observations
  24. GRB 130325A: Fermi GBM detection
  25. IPN Triangulation of GRB 130320A (long/very bright)
  26. GRB 130305A: Gemini follow-up observations
  27. GRB 130315A: GROND afterglow candidate
  28. GRB 130305A: optical upper limit in Mondy observatory
  29. GRB 130315A: Swift/UVOT Upper Limits
  30. GRB 130313A: optical upper limit in CrAO
  31. GRB 130313A: optical upper limit in Mondy observatory
  32. GRB 130315A: SALT optical observations
  33. GRB130313A: GTC early optical limits
  34. GRB 130313A: 5.8 GHz VLA upper limit
  35. Swift XRT observations of GRB 130310A
  36. GRB 130315A, Swift-BAT refined analysis
  37. GRB 130313A: Swift/UVOT Upper Limits
  38. GRB 130305A: PTF P48 optical upper limits
  39. GRB130315A BOOTES-3 optical limit
  40. GRB 130315A: Swift detection of a burst
  41. GRB 130305A: TLS Tautenburg observations
  42. GRB 130313A: RATIR Optical and NIR Observations
  43. GRB 130313A: TNG optical observations
  44. GRB130313A: Optical observations from GTC
  45. GRB 130313A: NOT optical upper limit
  46. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  47. GRB 130313A: Weihai optical upper limit
  48. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  49. GRB 130313A: Zadko observatory - Gingin optical observations
  50. GRB 130313A: MASTER-Net optical observations
  51. GRB 130313A: Swift detection of a short burst
  52. IPN Triangulation of GRB 130307A
  53. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  54. GRB 130310A: optical observations
  55. Swift XRT observations of GRB 130310A
  56. GRB 130306A: Swift Detection of a Possible Afterglow
  57. GRB 130131B: host detection and redshift
  58. Konus-Wind observation of GRB 130310A
  59. IPN triangulation of GRB 130310A
  60. GRB 130310A: Fermi GBM detection
  61. GRB 130310A: Fermi-LAT detection and localization
  62. GRB 130306A: MITSuME Ishigakijima upper limits
  63. IPN triangulation of GRB 130228A
  64. GRB 130305A BAT refined circular
  65. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  66. GRB 130305A: Gemini-North upper limit
  67. GRB 130307A: Fermi GBM detection
  68. GRB 130306A: Fermi GBM observation
  69. GRB 130305A: Swift/UVOT Upper Limit
  70. GRB 130305A: RATIR Observations
  71. GRB 130306A: Swift detection of a burst
  72. GRB 100615A: HST host detection and X-shooter redshift
  73. GRB 130305A: Fermi LAT Detection
  74. GRB 121128A: optical upper limit in Maidanak observatory
  75. GRB 130216A: Swift/UVOT Upper Limit
  76. GRB 130219A: Suzaku WAM observation of the prompt emission
  77. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  78. Trigger 549841: Swift detection of SGR1806-20
  79. GRB 130216A: possible radio counterpart is steady field source
  80. GRB 130216A: Swift/XRT observations
  81. IPN Triangulation of GRB 130219A
  82. GRB 130215A: PTF P48 optical detection
  83. GRB 130219A: Fermi GBM detection
  84. GRB 130216B: Swift/XRT observations
  85. GRB 130216B: MASTER-Net early observation
  86. GRB 130216A: MASTER-Net early observations
  87. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  88. GRB 130216A: MITSuME Ishigakijima upper limits
  89. GRB 130216B: P200 NIR Observations
  90. GRB 130216A: P200 NIR Observations
  91. GRB 130216A: Swift-BAT refined analysis
  92. GRB 130216A: TAROT La Silla observatory optical observations
  93. GRB 130215A: Additional P200 NIR observations
  94. GRB 120118B: host observations and redshift determination
  95. GRB 130216A: OSN I-band observations
  96. GRB 130216A: Swift detection of a burst
  97. GRB 130215A: P200 NIR observations
  98. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  99. GRB 130215A: MITSuME Okayama Optical Observation
  100. GRB 130215A: RAPTOR Measurements

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