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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"

38017 results found.

  1. GRB 041219 : optical follow-up observations
  2. Deep RAPTOR observations during GRB 041219
  3. GRB 041218 Optical Observations
  4. GRB 041219 Optical Observations
  5. GRB041219c: Third Burst in One Day from Swift-BAT
  6. GRB041219: Optical Afterglow Detection
  7. GRB041219: Continued NIR Observations
  8. GRB 041219 ,optical observation
  9. GRB 041219: Radio Afterglow Detection
  10. GRB 041218 : Radio Observations
  11. GRB 041218: R-band optical observations
  12. GRB041219: Confirmed NIR Afterglow
  13. GRB041218: Continued P60 Optical Observations
  14. GRB 041218: Optical Observation
  15. GRB 041219: Infrared Afterglow Candidate
  16. GRB041219, BVRcIc field calibration
  17. GRB 041219: Infrared Afterglow Candidate
  18. GRB041218, BVRcIc field calibration
  19. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  20. GRB041219: P60 Optical Observations
  21. GRB 041219 - A long GRB detected by INTEGRAL
  22. GRB 041219: PAIRITEL IR Observations, < 3 minutes after trigger
  23. GRB 041217: PROMPT Observations
  24. GRB041218: optical observations
  25. GRB041217: optical limit 30 min after GRB
  26. GRB 041218; optical candidate
  27. GRB 041218: Optical observations
  28. GRB 041217: LCO40 Optical Observations and Possible Candidates
  29. GRB 041218 - A long GRB detected by integral
  30. GRB041217: Optical Observations
  31. GRB041217: P60 Optical Observations
  32. GRB041217: Infrared Observations
  33. GRB041217: The First GRB Located On-Board Swift
  34. GRB041211: Faulkes Telescope continued optical monitoring
  35. Optical Transient in Lynx not a GRB
  36. Optical transient (GRB?) in Lynx
  37. Optical transient (GRB?) in Lynx, UT Dec 11.4436
  38. GRB041211: Continued P60 Observations
  39. GRB041211: RAPTOR observations
  40. GRB041211: Ashra Prototype optical observation
  41. GRB041211, Faulkes Telescope optical observation
  42. GRB041211, BVRcIc field calibration
  43. GRB 041211: Infrared Observations
  44. GRB 041211: KAIT observations
  45. GRB 041211: Optical follow-up in East Asian region
  46. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  47. GRB041211: P60 optical imaging
  48. GRB970815: Discovery of Optical Afterglow
  49. Distribution of IBAS Alerts for NON-GRB sources
  50. Triangulation of short GRB 041116 (large error box)
  51. GRB 040924: Afterglow Color
  52. GRB 041006: GETS Optical Afterglow Observation
  53. Summary of the recent bursts from SGR 1806-20
  54. GRB 041006: Optical Observations
  55. GRB041006, late-time optical photometry
  56. IBAS GRB Alert # 2034
  57. GRB041006: RTT150 Optical Observations
  58. Bright bursts from SGR1806-20
  59. GRB 041016: BOOTES-2 simultaneous observation
  60. GRB041006: RTT150 Optical Observations
  61. GRB 041016: Optical limits
  62. GRB 041016: Optical limits in V, R, I
  63. GRB 041016:Optical limit during first minute
  64. GRB041016: MASTER: Optical observations
  65. GRB 041015: Optical Observations at Rikubetsu
  66. GRB041006: Near Infrared observations
  67. GRB 041016: Optical limit
  68. GRB 041015 R band observations
  69. GRB040924, BVRcIc field calibration
  70. GRB041015: MASTER: Optical observations
  71. GRB041015,optical observation
  72. GRB 041015: Optical limit at Osaka University
  73. GRB041015 : Optical follow-up at Kiso
  74. GRB 041015 - A long GRB detected by INTEGRAL
  75. GRB 041006 R observations in Loiano
  76. GRB041006: VLT observations of the afterglow and host galaxy
  77. GRB041006: Optical observations and Potential host galaxy
  78. GRB041006, BVRcIc field calibration
  79. GRB 040924: VLT spectroscopy
  80. GRB 041006: SARA afterglow observations
  81. Search for SN light in XRF 040912 with MEGACAM
  82. GRB 040916: Afterglow Color at Early Times
  83. GRB 041006 Optical afterglow observations
  84. IBAS GRB Alert # 2010
  85. GRB 041006: BR observations with VATT
  86. GRB 041006: Redshift confirmed
  87. GRB041006: Liverpool Telescope optical observations
  88. GRB 041006: Colour measurement
  89. GRB041006: break in the light curve
  90. GRB 041006: Radio Observations
  91. GRB041006, further submilllimetre observations
  92. GRB 041006 : optical follow-up observation at Lulin Observatory
  93. GRB 041006 : Optical follow-up observation at TAROT
  94. GRB041006: Optical photometry and spectroscopy at TNG
  95. GRB 041006: presice astrometry
  96. GRB041006 (= H3570): Chandra Observations In Progress
  97. GRB 041006 : optical observation at Bisei
  98. GRB041006 (=HETE3570): optical observations
  99. ROTSE-IIIa Observations of GRB 041006
  100. GRB041006, submillimetre observations

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