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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"

45528 results found.

  1. Swift-BAT detection of the bright long burst GRB041219
  2. GRB 041218: Optical Observation
  3. GRB 041219: Infrared Afterglow Candidate
  4. GRB041219, BVRcIc field calibration
  5. GRB 041219: Infrared Afterglow Candidate
  6. GRB041218, BVRcIc field calibration
  7. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  8. GRB041219: P60 Optical Observations
  9. GRB 041219 - A long GRB detected by INTEGRAL
  10. GRB 041219: PAIRITEL IR Observations, < 3 minutes after trigger
  11. GRB 041217: PROMPT Observations
  12. GRB041218: optical observations
  13. GRB041217: optical limit 30 min after GRB
  14. GRB 041218; optical candidate
  15. GRB 041218: Optical observations
  16. GRB 041217: LCO40 Optical Observations and Possible Candidates
  17. GRB 041218 - A long GRB detected by integral
  18. GRB041217: Optical Observations
  19. GRB041217: NIR and optical observations with REM
  20. GRB041217: P60 Optical Observations
  21. GRB041217: Infrared Observations
  22. GRB041217: The First GRB Located On-Board Swift
  23. GRB041211: Faulkes Telescope continued optical monitoring
  24. Optical Transient in Lynx not a GRB
  25. Optical transient (GRB?) in Lynx
  26. Optical transient (GRB?) in Lynx, UT Dec 11.4436
  27. GRB041211: Continued P60 Observations
  28. GRB041211: RAPTOR observations
  29. GRB041211: Ashra Prototype optical observation
  30. GRB041211, Faulkes Telescope 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. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  37. GRB041211: P60 optical imaging
  38. GRB970815: Discovery of Optical Afterglow
  39. Distribution of IBAS Alerts for NON-GRB sources
  40. Triangulation of short GRB 041116 (large error box)
  41. GRB041015: Near-Infrared observations
  42. GRB 040924: Afterglow Color
  43. GRB 041006: GETS Optical Afterglow Observation
  44. Summary of the recent bursts from SGR 1806-20
  45. GRB 041006: Optical Observations
  46. GRB041006, late-time optical photometry
  47. GRB041015, optical observation in CrAO
  48. IBAS GRB Alert # 2034
  49. GRB041006: RTT150 Optical Observations
  50. GRB041015 : Multi epoch optical observations
  51. HST Observations: XRF 040701 and 040812
  52. Bright bursts from SGR1806-20
  53. GRB 041016: BOOTES-2 simultaneous observation
  54. GRB041006: RTT150 Optical Observations
  55. GRB041016,optical observation
  56. GRB 041016: Optical limits
  57. GRB 041016: Optical limits in V, R, I
  58. GRB 041016:Optical limit during first minute
  59. GRB041016: MASTER: Optical observations
  60. GRB 041015: Optical Observations at Rikubetsu
  61. GRB041006: Near Infrared observations
  62. GRB 041016: Optical limit
  63. GRB 041015 R band observations
  64. GRB040924, BVRcIc field calibration
  65. GRB041015: MASTER: Optical observations
  66. GRB041015,optical observation
  67. GRB041006: Fading X-ray Afterglow Observed with Chandra
  68. GRB 041015: Optical limit at Osaka University
  69. GRB041015 : Optical follow-up at Kiso
  70. GRB 041015 - A long GRB detected by INTEGRAL
  71. GRB 041006 R observations in Loiano
  72. GRB041006: VLT observations of the afterglow and host galaxy
  73. GRB041006: Optical observations and Potential host galaxy
  74. GRB041006, BVRcIc field calibration
  75. GRB 040924: VLT spectroscopy
  76. GRB 041006: SARA afterglow observations
  77. GRB041006, optical observation in CrAO
  78. Search for SN light in XRF 040912 with MEGACAM
  79. GRB 040916: Afterglow Color at Early Times
  80. GRB 041006 Optical afterglow observations
  81. IBAS GRB Alert # 2010
  82. GRB 041006: BR observations with VATT
  83. GRB 041006: Redshift confirmed
  84. GRB041006: Liverpool Telescope optical observations
  85. GRB 041006: Colour measurement
  86. GRB041006: break in the light curve
  87. GRB 041006: Radio Observations
  88. GRB041006, further submilllimetre observations
  89. GRB 041006 : optical follow-up observation at Lulin Observatory
  90. GRB 041006 : Optical follow-up observation at TAROT
  91. GRB041006: Optical photometry and spectroscopy at TNG
  92. GRB 041006: presice astrometry
  93. GRB041006 (= H3570): Chandra Observations In Progress
  94. GRB 041006 : optical observation at Bisei
  95. GRB041006, optical I observation
  96. GRB041006 (=HETE3570): optical observations
  97. ROTSE-IIIa Observations of GRB 041006
  98. GRB041006, optical observation
  99. GRB041006, submillimetre observations
  100. GRB041006: MASTER optical observations

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