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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"

28254 results found.

  1. GRB 130420A: Weihai Optical Observations
  2. GRB 130420B: Swift detection of a burst
  3. GRB 130420A: T21 optical observations
  4. GRB 130420A: RATIR Optical and NIR Observations
  5. GRB 130420A: PAIRITEL NIR detections
  6. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  7. GRB 130420A: Swift detection of a burst with an optical counterpart
  8. GRB 130418A: Continued RATIR Optical and NIR Observations
  9. GRB 130418A: Swift-XRT refined Analysis
  10. GRB 130418A: SMARTS optical/IR afterglow observations
  11. GRB 130418A: Submm observations from SMA
  12. GRB 130327B: Swift/XRT source is not the afterglow
  13. Trigger 553930: Swift detection of a possible flare from HR 5110
  14. GRB 130418A: T21 optical observation
  15. GRB 130418A: T18 and T21 optical observations
  16. GRB 130418A: LOAO Observation
  17. GRB 130419A: Swift detection of a burst
  18. GRB 130418A: RATIR Optical and NIR Observations
  19. GRB 130418A: CARMA 3mm detection
  20. GRB 130418A: GROND detection of the optical-NIR afterglow
  21. GRB130418A: OSN 1.5m fading afterglow detection
  22. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  23. GRB 130418A: Enhanced Swift-XRT position
  24. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  25. GRB 130418A: TNG optical observations
  26. GRB 130418A: Redshift from 10.4m GTC
  27. GRB 130418A: 1.23m I-band observations
  28. GRB 130418A: Swift detection of a burst with an optical counterpart
  29. GRB 130408a: Skynet Optical Observations
  30. GRB 130408A: SMARTS optical/IR afterglow observations
  31. GRB 130407A: Swift-XRT observations
  32. GRB 130408A: Swift-XRT refined Analysis
  33. GRB 130408A: Enhanced Swift-XRT position
  34. GRB 130408A - Gemini-S/GMOS redshift determination
  35. GRB 130408A - VLT/X-shooter redshift determination
  36. GRB 130408A: GROND detection of the afterglow
  37. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  38. GRB 130408A: Liverpool Telescope Optical candidate detection
  39. GRB 130408A: Swift detection of a burst
  40. GRB 130407A Tiled Swift observations
  41. GRB 130407A: MAXI/GSC detection
  42. GRB 130211A: Retraction of afterglow candidate
  43. Swift detection of IGR J18245-2452
  44. Swift/XRT observation of GRB 130327B
  45. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  46. GRB 130306A: Confirmation of the X-ray Afterglow
  47. GRB 130310A: RATIR Observations
  48. Swift Trigger 552142 is a noise event
  49. Konus-Wind observation of GRB 130327B
  50. GRB 130327B: Fermi-LAT detection of a burst
  51. GRB 130327B: Fermi GBM detection
  52. Swift Trigger 552142: a possible GRB
  53. GRB 130327B: gamma-ray detection by AGILE
  54. GRB 130327A: Gemini Observations
  55. GRB 130327A: Swift-XRT refined Analysis
  56. GRB 130327A: Weihai optical obsevations
  57. GRB 130327A: Swift/UVOT Upper Limits
  58. Konus-Wind observation of GRB 130325A
  59. GRB 130327A: ISON-NM optical upper limit
  60. GRB 130325A Tiled Swift observations
  61. GRB 130327A: Enhanced Swift-XRT position
  62. GRB 130327A: RATIR Optical and NIR Observations
  63. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  64. GRB 130325A: Fermi LAT detection
  65. GRB 130327A: Swift detection of a burst
  66. report: GRB 130315A: Zadko observatory - Gingin optical observations
  67. GRB 130325A: Fermi GBM detection
  68. GRB 130305A: Gemini follow-up observations
  69. GRB 130315A: GROND afterglow candidate
  70. GRB 130305A: optical upper limit in Mondy observatory
  71. GRB 130315A: Swift/UVOT Upper Limits
  72. GRB 130313A: optical upper limit in CrAO
  73. GRB 130313A: optical upper limit in Mondy observatory
  74. GRB 130315A: SALT optical observations
  75. GRB130313A: GTC early optical limits
  76. GRB 130313A: 5.8 GHz VLA upper limit
  77. GRB 130315A: Swift-XRT refined Analysis
  78. Swift XRT observations of GRB 130310A
  79. GRB 130313A: Swift/UVOT Upper Limits
  80. GRB 130305A: PTF P48 optical upper limits
  81. GRB 130315A: Swift detection of a burst
  82. GRB 130310A : Suzaku WAM observation of the prompt emission
  83. GRB 130305A: TLS Tautenburg observations
  84. GRB 130313A: RATIR Optical and NIR Observations
  85. GRB 130313A: TNG optical observations
  86. GRB 130313A: Fading X-ray Afterglow
  87. Swift-BAT trigger 551030 is not astrophysical
  88. GRB 130215A: Detection of the SN with the 10.4m GTC
  89. GRB130313A: Optical observations from GTC
  90. GRB 130313A: NOT optical upper limit
  91. GRB 130313A: Swift-XRT refined Analysis
  92. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  93. GRB 130313A: Weihai optical upper limit
  94. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  95. GRB 130313A: Swift detection of a short burst
  96. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  97. Swift XRT RETRACTION of GRB 130310A afterglow detection
  98. GRB 130310A: optical observations
  99. Swift XRT observations of GRB 130310A
  100. GRB 130306A: Swift Detection of a Possible Afterglow

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