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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"

28128 results found.

  1. GRB 041218: optical observations
  2. GRB 041219 : optical follow-up observations
  3. Deep RAPTOR observations during GRB 041219
  4. GRB 041218 Optical Observations
  5. GRB041219: Continued NIR Observations
  6. GRB 041219 ,optical observation
  7. GRB 041219: Radio Afterglow Detection
  8. GRB 041218 : Radio Observations
  9. GRB 041218: R-band optical observations
  10. GRB041218: optical observations
  11. GRB041219: Confirmed NIR Afterglow
  12. Swift-BAT detection of the bright long burst GRB041219
  13. GRB 041219: Infrared Afterglow Candidate
  14. GRB041219, BVRcIc field calibration
  15. GRB 041219: Infrared Afterglow Candidate
  16. GRB041218, BVRcIc field calibration
  17. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  18. GRB 041219 - A long GRB detected by INTEGRAL
  19. GRB 041219: PAIRITEL IR Observations, < 3 minutes after trigger
  20. GRB 041217: PROMPT Observations
  21. GRB 041217: LCO40 Optical Observations and Possible Candidates
  22. GRB 041218 - A long GRB detected by integral
  23. GRB041217: NIR and optical observations with REM
  24. GRB041217: Infrared Observations
  25. GRB041217: The First GRB Located On-Board Swift
  26. GRB041211: Faulkes Telescope continued optical monitoring
  27. Optical Transient in Lynx not a GRB
  28. Optical transient (GRB?) in Lynx
  29. GRB041211: RAPTOR observations
  30. GRB041211: Ashra Prototype optical observation
  31. GRB041211, BVRcIc field calibration
  32. GRB041211,optical observation
  33. GRB 041211: Infrared Observations
  34. GRB 041211: KAIT observations
  35. GRB 041211: Optical follow-up in East Asian region
  36. Triangulation of short GRB 041116 (large error box)
  37. GRB 040924: Afterglow Color
  38. GRB 041006: GETS Optical Afterglow Observation
  39. Summary of the recent bursts from SGR 1806-20
  40. GRB 041006: Optical Observations
  41. GRB041006, late-time optical photometry
  42. GRB041006: RTT150 Optical Observations
  43. HST Observations: XRF 040701 and 040812
  44. Bright bursts from SGR1806-20
  45. GRB 041016: BOOTES-2 simultaneous observation
  46. GRB041006: RTT150 Optical Observations
  47. GRB041016,optical observation
  48. GRB 041016: Optical limits
  49. GRB 041016:Optical limit during first minute
  50. GRB 041015: Optical Observations at Rikubetsu
  51. GRB 041016: Optical limit
  52. GRB 041015 R band observations
  53. GRB040924, BVRcIc field calibration
  54. GRB041015,optical observation
  55. GRB041006: Fading X-ray Afterglow Observed with Chandra
  56. GRB 041015 - A long GRB detected by INTEGRAL
  57. GRB041006: VLT observations of the afterglow and host galaxy
  58. GRB041006: Optical observations and Potential host galaxy
  59. GRB041006, BVRcIc field calibration
  60. GRB 040924: VLT spectroscopy
  61. GRB 041006: SARA afterglow observations
  62. GRB041006, optical observation in CrAO
  63. Search for SN light in XRF 040912 with MEGACAM
  64. GRB 041006: BR observations with VATT
  65. GRB 041006: Redshift confirmed
  66. GRB 041006: Radio Observations
  67. GRB 041006 : optical follow-up observation at Lulin Observatory
  68. GRB041006: Optical photometry and spectroscopy at TNG
  69. GRB 041006: presice astrometry
  70. GRB041006, optical I observation
  71. GRB041006 (=HETE3570): optical observations
  72. ROTSE-IIIa Observations of GRB 041006
  73. GRB041006: MASTER optical observations
  74. GRB041006,optical observation
  75. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  76. GRB041006: Fading of optical afterglow candidate
  77. GRB 041006: Optical afterglow candidate
  78. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  79. XRF 020903: Observations of the Host Galaxy
  80. radio observations, GRB 040924
  81. GRB040929,optical observation
  82. GRB040924,optical observation
  83. GRB040924,optical observation
  84. GRB 040924: detection of possible host galaxy by Subaru
  85. GRB040924: KAIT observations
  86. GRB040924 : Optical candidate observations at Lulin observatory
  87. GRB040924 : Optical candidate observations at Lulin observatory
  88. GRB 040924: Subaru NIR observation
  89. XRF 040912: Radio Observations
  90. XRF 040916: Radio Observations
  91. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  92. XRF040916: continuing decay of OT
  93. TAROT Observations of GRB 040916 (HETE #3558)
  94. GRB040912(=H3557): Candidate Optical Afterglow
  95. XRF040916, optical observations
  96. XRF 040912, identification of CXO sources
  97. XRF040912, BVRcIc field calibration
  98. XRF040916, BVRcIc field calibration
  99. GRB040916: Archival optical observations
  100. GRB040912(=H3557): Observations with the Chandra X-ray Observatory

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