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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"

41700 results found.

  1. GRB041217: P60 Optical Observations
  2. GRB041217: Infrared Observations
  3. GRB041217: The First GRB Located On-Board Swift
  4. GRB041211: Faulkes Telescope continued optical monitoring
  5. Optical Transient in Lynx not a GRB
  6. Optical transient (GRB?) in Lynx
  7. Optical transient (GRB?) in Lynx, UT Dec 11.4436
  8. GRB041211: Continued P60 Observations
  9. GRB041211: RAPTOR observations
  10. GRB041211: Ashra Prototype optical observation
  11. GRB041211, Faulkes Telescope optical observation
  12. GRB041211, BVRcIc field calibration
  13. GRB041211,optical observation
  14. GRB 041211: Infrared Observations
  15. GRB 041211: KAIT observations
  16. GRB 041211: Optical follow-up in East Asian region
  17. GRB041211: P60 optical imaging
  18. GRB970815: Discovery of Optical Afterglow
  19. GRB041015: Near-Infrared observations
  20. GRB 040924: Afterglow Color
  21. GRB 041006: GETS Optical Afterglow Observation
  22. Summary of the recent bursts from SGR 1806-20
  23. GRB 041006: Optical Observations
  24. GRB041006, late-time optical photometry
  25. GRB041015, optical observation in CrAO
  26. GRB041006: RTT150 Optical Observations
  27. GRB041015 : Multi epoch optical observations
  28. HST Observations: XRF 040701 and 040812
  29. GRB041006: RTT150 Optical Observations
  30. GRB041016,optical observation
  31. GRB 041016: Optical limits
  32. GRB 041016: Optical limits in V, R, I
  33. GRB 041016:Optical limit during first minute
  34. GRB041016: MASTER: Optical observations
  35. GRB 041015: Optical Observations at Rikubetsu
  36. GRB041006: Near Infrared observations
  37. GRB 041016: Optical limit
  38. GRB 041015 R band observations
  39. GRB040924, BVRcIc field calibration
  40. GRB041015: MASTER: Optical observations
  41. GRB041015,optical observation
  42. GRB041006: Fading X-ray Afterglow Observed with Chandra
  43. GRB 041015: Optical limit at Osaka University
  44. GRB041015 : Optical follow-up at Kiso
  45. GRB 041015 - A long GRB detected by INTEGRAL
  46. GRB 041006 R observations in Loiano
  47. GRB041006: VLT observations of the afterglow and host galaxy
  48. GRB041006: Optical observations and Potential host galaxy
  49. GRB041006, BVRcIc field calibration
  50. GRB 040924: VLT spectroscopy
  51. GRB 041006: SARA afterglow observations
  52. GRB041006, optical observation in CrAO
  53. Search for SN light in XRF 040912 with MEGACAM
  54. GRB 040916: Afterglow Color at Early Times
  55. GRB 041006 Optical afterglow observations
  56. IBAS GRB Alert # 2010
  57. GRB 041006: BR observations with VATT
  58. GRB 041006: Redshift confirmed
  59. GRB041006: Liverpool Telescope optical observations
  60. GRB 041006: Colour measurement
  61. GRB041006: break in the light curve
  62. GRB 041006: Radio Observations
  63. GRB041006, further submilllimetre observations
  64. GRB 041006 : optical follow-up observation at Lulin Observatory
  65. GRB 041006 : Optical follow-up observation at TAROT
  66. GRB041006: Optical photometry and spectroscopy at TNG
  67. GRB 041006: presice astrometry
  68. GRB041006 (= H3570): Chandra Observations In Progress
  69. GRB 041006 : optical observation at Bisei
  70. GRB041006, optical I observation
  71. GRB041006 (=HETE3570): optical observations
  72. ROTSE-IIIa Observations of GRB 041006
  73. GRB041006, optical observation
  74. GRB041006, submillimetre observations
  75. GRB041006: MASTER optical observations
  76. GRB041006,optical observation
  77. GRB 041006: Optical decay
  78. GRB041006: Fading of optical afterglow candidate
  79. GRB 041006 : Optical follow-up observation at KISO
  80. GRB 041006: Finding chart
  81. GRB 041006: Optical afterglow candidate
  82. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  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,optical observation
  90. GRB040929: MASTER optical observations
  91. Konus-Wind and Helicon-Coronas-F observations of GRB040924
  92. GRB040924,optical observation
  93. GRB040924, RTT150 optical observation
  94. GRB040924,optical observation
  95. GRB 040924: detection of possible host galaxy by Subaru
  96. GRB040924, RTT150 optical observation
  97. GRB040924: KAIT observations
  98. GRB040924: Afterglow magnitude at t=17.5hr
  99. GRB 040924: WSRT Radio Observations
  100. GRB040924 : Optical candidate observations at Lulin observatory

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