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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"

37681 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. GRB 041211: Infrared Observations
  8. GRB 041211: KAIT observations
  9. GRB 041211: Optical follow-up in East Asian region
  10. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  11. GRB041211: P60 optical imaging
  12. GRB970815: Discovery of Optical Afterglow
  13. Distribution of IBAS Alerts for NON-GRB sources
  14. Triangulation of short GRB 041116 (large error box)
  15. GRB 040924: Afterglow Color
  16. GRB 041006: GETS Optical Afterglow Observation
  17. Summary of the recent bursts from SGR 1806-20
  18. GRB 041006: Optical Observations
  19. GRB041006, late-time optical photometry
  20. IBAS GRB Alert # 2034
  21. GRB041006: RTT150 Optical Observations
  22. Bright bursts from SGR1806-20
  23. GRB 041016: BOOTES-2 simultaneous observation
  24. GRB041006: RTT150 Optical Observations
  25. GRB 041016: Optical limits
  26. GRB 041016: Optical limits in V, R, I
  27. GRB 041016:Optical limit during first minute
  28. GRB041016: MASTER: Optical observations
  29. GRB 041015: Optical Observations at Rikubetsu
  30. GRB041006: Near Infrared observations
  31. GRB 041016: Optical limit
  32. GRB 041015 R band observations
  33. GRB040924, BVRcIc field calibration
  34. GRB041015: MASTER: Optical observations
  35. GRB041015,optical observation
  36. GRB 041015: Optical limit at Osaka University
  37. GRB041015 : Optical follow-up at Kiso
  38. GRB 041015 - A long GRB detected by INTEGRAL
  39. GRB 041006 R observations in Loiano
  40. GRB041006: VLT observations of the afterglow and host galaxy
  41. GRB041006: Optical observations and Potential host galaxy
  42. GRB041006, BVRcIc field calibration
  43. GRB 040924: VLT spectroscopy
  44. GRB 041006: SARA afterglow observations
  45. Search for SN light in XRF 040912 with MEGACAM
  46. GRB 040916: Afterglow Color at Early Times
  47. GRB 041006 Optical afterglow observations
  48. IBAS GRB Alert # 2010
  49. GRB 041006: BR observations with VATT
  50. GRB 041006: Redshift confirmed
  51. GRB041006: Liverpool Telescope optical observations
  52. GRB 041006: Colour measurement
  53. GRB041006: break in the light curve
  54. GRB 041006: Radio Observations
  55. GRB041006, further submilllimetre observations
  56. GRB 041006 : optical follow-up observation at Lulin Observatory
  57. GRB 041006 : Optical follow-up observation at TAROT
  58. GRB041006: Optical photometry and spectroscopy at TNG
  59. GRB 041006: presice astrometry
  60. GRB041006 (= H3570): Chandra Observations In Progress
  61. GRB 041006 : optical observation at Bisei
  62. GRB041006 (=HETE3570): optical observations
  63. ROTSE-IIIa Observations of GRB 041006
  64. GRB041006, submillimetre observations
  65. GRB041006: MASTER optical observations
  66. GRB 041006: Optical decay
  67. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  68. GRB 041006 : Optical follow-up observation at KISO
  69. GRB 041006: Finding chart
  70. GRB 041006: Optical afterglow candidate
  71. XRF 020903: Observations of the Host Galaxy (authors)
  72. GRB 040924: Second Epoch WSRT Radio Observations
  73. radio observations, GRB 040924
  74. IBAS Alert 1991. Not a real GRB
  75. GRB040929,optical observation
  76. GRB040924,optical observation
  77. GRB040924, RTT150 optical observation
  78. GRB 040924: detection of possible host galaxy by Subaru
  79. GRB040924, RTT150 optical observation
  80. GRB040924: KAIT observations
  81. GRB040924: Afterglow magnitude at t=17.5hr
  82. GRB 040924: WSRT Radio Observations
  83. GRB 040924: NIR finding chart
  84. GRB040924 : Optical candidate observations at Lulin observatory
  85. GRB040924 : Optical candidate observations at Lulin observatory
  86. GRB 040924: Subaru NIR observation
  87. GRB 040924: RTT150 optical observations
  88. GRB 040924, optical follow-up
  89. IPN triangulation of GRB040924 (H3564)
  90. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  91. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  92. XRF040916: continuing decay of OT
  93. TAROT Observations of GRB 040916 (HETE #3558)
  94. XRF040916, optical observations
  95. XRF040916: Optical Transient Candidate by Subaru
  96. GRB040916 optical limits 17 min after GRB
  97. XRF 040912 (=H3557): Spectral and Temporal Properties
  98. XRF040916, Ic observations
  99. XRF040912, BVRcIc field calibration
  100. XRF040916, BVRcIc field calibration

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