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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"

22198 results found.

  1. GRB041223: Swift XRT Detection of X-ray Afterglow Emission
  2. GRB 041219c: PROMPT Observations
  3. GRB041223: ROTSE-III Optical Observations
  4. GRB 041218: optical observations
  5. GRB 041219: Second Epoch WSRT Radio Observations
  6. GRB 041219: WSRT Radio Afterglow Detection
  7. GRB 041219: Keck IR Observations and Astrometric Refinement of the
  8. GRB 041218: Optical observations
  9. GRB 041219 : optical follow-up observations
  10. Deep RAPTOR observations during GRB 041219
  11. GRB 041218 Optical Observations
  12. GRB 041219 Optical Observations
  13. GRB041219: Optical Afterglow Detection
  14. GRB041219: Continued NIR Observations
  15. GRB 041219: Radio Afterglow Detection
  16. GRB 041218 : Radio Observations
  17. GRB 041218: R-band optical observations
  18. GRB041218: Liverpool Telescope optical observations
  19. GRB041218: optical observations
  20. GRB041219: Confirmed NIR Afterglow
  21. GRB041218: Continued P60 Optical Observations
  22. GRB 041219: Infrared Afterglow Candidate
  23. GRB 041219: Infrared Afterglow Candidate
  24. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  25. GRB041219: P60 Optical Observations
  26. GRB 041219: PAIRITEL IR Observations, < 3 minutes after trigger
  27. GRB 041217: PROMPT Observations
  28. GRB041218: optical observations
  29. GRB 041218; optical candidate
  30. GRB 041218: Optical observations
  31. GRB 041217: LCO40 Optical Observations and Possible Candidates
  32. GRB041217: Optical Observations
  33. GRB041217: NIR and optical observations with REM
  34. GRB041217: P60 Optical Observations
  35. GRB041217: Infrared Observations
  36. GRB041211: Faulkes Telescope continued optical monitoring
  37. Optical transient (GRB?) in Lynx
  38. Optical transient (GRB?) in Lynx, UT Dec 11.4436
  39. GRB041211: Continued P60 Observations
  40. GRB041211: RAPTOR observations
  41. GRB041211, Faulkes Telescope optical observation
  42. GRB 041211: Infrared Observations
  43. GRB 041211: KAIT observations
  44. GRB 041211: Optical follow-up in East Asian region
  45. GRB970815: Discovery of Optical Afterglow
  46. GRB041015: Near-Infrared observations
  47. GRB 040924: Afterglow Color
  48. Summary of the recent bursts from SGR 1806-20
  49. GRB 041006: Optical Observations
  50. GRB041006: RTT150 Optical Observations
  51. GRB041015 : Multi epoch optical observations
  52. HST Observations: XRF 040701 and 040812
  53. GRB041006: RTT150 Optical Observations
  54. GRB 041016:Optical limit during first minute
  55. GRB041016: MASTER: Optical observations
  56. GRB 041015: Optical Observations at Rikubetsu
  57. GRB041006: Near Infrared observations
  58. GRB 041015 R band observations
  59. GRB041015: MASTER: Optical observations
  60. GRB041006: Fading X-ray Afterglow Observed with Chandra
  61. GRB 041006 R observations in Loiano
  62. GRB041006: VLT observations of the afterglow and host galaxy
  63. GRB041006: Optical observations and Potential host galaxy
  64. GRB 041006: SARA afterglow observations
  65. Search for SN light in XRF 040912 with MEGACAM
  66. GRB 040916: Afterglow Color at Early Times
  67. GRB 041006 Optical afterglow observations
  68. IBAS GRB Alert # 2010
  69. GRB 041006: BR observations with VATT
  70. GRB 041006: Redshift confirmed
  71. GRB041006: Liverpool Telescope optical observations
  72. GRB 041006: Colour measurement
  73. GRB 041006: Radio Observations
  74. GRB041006, further submilllimetre observations
  75. GRB041006: Optical photometry and spectroscopy at TNG
  76. GRB041006 (= H3570): Chandra Observations In Progress
  77. GRB041006, optical I observation
  78. GRB041006 (=HETE3570): optical observations
  79. ROTSE-IIIa Observations of GRB 041006
  80. GRB041006, submillimetre observations
  81. GRB041006: MASTER optical observations
  82. GRB 041006: Optical decay
  83. Very strong outburst from SGR 1806-20 detected with INTEGRAL
  84. XRF 020903: Observations of the Host Galaxy (authors)
  85. XRF 020903: Observations of the Host Galaxy
  86. SGR 1806-20 still active
  87. GRB 040924: Second Epoch WSRT Radio Observations
  88. radio observations, GRB 040924
  89. GRB040929: MASTER optical observations
  90. Konus-Wind and Helicon-Coronas-F observations of GRB040924
  91. GRB040924,optical observation
  92. GRB040924, RTT150 optical observation
  93. GRB040924, RTT150 optical observation
  94. GRB040924: KAIT observations
  95. GRB 040924: WSRT Radio Observations
  96. GRB040924 : Optical candidate observations at Lulin observatory
  97. GRB040924 : Optical candidate observations at Lulin observatory
  98. GRB040924: Optical afterglow properties
  99. GRB 040924: RTT150 optical observations
  100. GRB040924: MASTER Optical observations

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