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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"

42429 results found.

  1. Optical transient (GRB?) in Lynx, UT Dec 11.4436
  2. GRB041211: Continued P60 Observations
  3. GRB041211: RAPTOR observations
  4. GRB041211: Ashra Prototype optical observation
  5. GRB041211, Faulkes Telescope optical observation
  6. GRB041211, BVRcIc field calibration
  7. GRB041211,optical observation
  8. GRB 041211: Infrared Observations
  9. GRB 041211: KAIT observations
  10. GRB 041211: Optical follow-up in East Asian region
  11. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  12. GRB041211: P60 optical imaging
  13. GRB970815: Discovery of Optical Afterglow
  14. Triangulation of short GRB 041116 (large error box)
  15. GRB041015: Near-Infrared observations
  16. GRB 040924: Afterglow Color
  17. GRB 041006: GETS Optical Afterglow Observation
  18. Summary of the recent bursts from SGR 1806-20
  19. GRB 041006: Optical Observations
  20. GRB041006, late-time optical photometry
  21. GRB041015, optical observation in CrAO
  22. GRB041006: RTT150 Optical Observations
  23. GRB041015 : Multi epoch optical observations
  24. GRB 041016: BOOTES-2 simultaneous observation
  25. GRB041006: RTT150 Optical Observations
  26. GRB041016,optical observation
  27. GRB 041016: Optical limits
  28. GRB 041016: Optical limits in V, R, I
  29. GRB 041016:Optical limit during first minute
  30. GRB041016: MASTER: Optical observations
  31. GRB 041015: Optical Observations at Rikubetsu
  32. GRB041006: Near Infrared observations
  33. GRB 041016: Optical limit
  34. GRB 041015 R band observations
  35. GRB040924, BVRcIc field calibration
  36. GRB041015: MASTER: Optical observations
  37. GRB041015,optical observation
  38. GRB041006: Fading X-ray Afterglow Observed with Chandra
  39. GRB 041015: Optical limit at Osaka University
  40. GRB041015 : Optical follow-up at Kiso
  41. GRB 041015 - A long GRB detected by INTEGRAL
  42. GRB 041006 R observations in Loiano
  43. GRB041006: VLT observations of the afterglow and host galaxy
  44. GRB041006: Optical observations and Potential host galaxy
  45. GRB041006, BVRcIc field calibration
  46. GRB 040924: VLT spectroscopy
  47. GRB 041006: SARA afterglow observations
  48. GRB041006, optical observation in CrAO
  49. Search for SN light in XRF 040912 with MEGACAM
  50. GRB 040916: Afterglow Color at Early Times
  51. GRB 041006 Optical afterglow observations
  52. IBAS GRB Alert # 2010
  53. GRB 041006: BR observations with VATT
  54. GRB 041006: Redshift confirmed
  55. GRB041006: Liverpool Telescope optical observations
  56. GRB041006: break in the light curve
  57. GRB 041006: Radio Observations
  58. GRB041006, further submilllimetre observations
  59. GRB 041006 : optical follow-up observation at Lulin Observatory
  60. GRB 041006 : Optical follow-up observation at TAROT
  61. GRB041006: Optical photometry and spectroscopy at TNG
  62. GRB 041006: presice astrometry
  63. GRB 041006 : optical observation at Bisei
  64. GRB041006, optical I observation
  65. GRB041006 (=HETE3570): optical observations
  66. ROTSE-IIIa Observations of GRB 041006
  67. GRB041006, optical observation
  68. GRB041006, submillimetre observations
  69. GRB041006: MASTER optical observations
  70. GRB041006,optical observation
  71. GRB 041006: Optical decay
  72. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  73. GRB041006: Fading of optical afterglow candidate
  74. GRB 041006 : Optical follow-up observation at KISO
  75. GRB 041006: Finding chart
  76. GRB 041006: Optical afterglow candidate
  77. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  78. Very strong outburst from SGR 1806-20 detected with INTEGRAL
  79. XRF 020903: Observations of the Host Galaxy
  80. SGR 1806-20 still active
  81. GRB 040924: Second Epoch WSRT Radio Observations
  82. radio observations, GRB 040924
  83. GRB040929,optical observation
  84. GRB040929: MASTER optical observations
  85. Konus-Wind and Helicon-Coronas-F observations of GRB040924
  86. GRB040924,optical observation
  87. GRB040924, RTT150 optical observation
  88. GRB040924,optical observation
  89. GRB 040924: detection of possible host galaxy by Subaru
  90. GRB040924, RTT150 optical observation
  91. GRB040924: KAIT observations
  92. GRB040924: Afterglow magnitude at t=17.5hr
  93. GRB 040924: WSRT Radio Observations
  94. GRB040924 : Optical candidate observations at Lulin observatory
  95. GRB040924 : Optical candidate observations at Lulin observatory
  96. GRB 040924: Subaru NIR observation
  97. GRB040924: Optical afterglow properties
  98. GRB 040924: RTT150 optical observations
  99. GRB 040924, optical follow-up
  100. GRB040924: MASTER: OT decay

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