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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"

42930 results found.

  1. GRB 060204A: ROSAT Pointing
  2. GRB 060206: Super-LOTIS observations
  3. GRB 060206: Swift-BAT refined analysis
  4. GRB 060206 : Lulin optical observations
  5. GRB060206: SDSS Pre-Burst Observations
  6. GRB060206: Swift XRT Refined Analysis
  7. GRB060206: Liverpool Telescope observation
  8. GRB 060206: Spectroscopic Redshift
  9. GRB060206: P60 Optical Observations
  10. GRB 060206: KAIT observations
  11. GRB060206: Swift XRT Position
  12. GRB060206: SARA Detection
  13. GRB 060206: RAPTOR observations of afterglow candidate variability.
  14. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  15. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  16. GRB060206: Swift-BAT detection of a burst
  17. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  18. GRB060204C: optical observation
  19. GRB 060204B: BVRi-band detections of optical afterglow
  20. GRB 060204A: Swift XRT upper limit
  21. GRB 060204A: FRAM optical observations
  22. GRB060204B: Swift/UVOT refined analysis
  23. Swift XRT Observation of GRB 060204C
  24. GRB 060204B: Swift-BAT refined analysis
  25. GRB060204B: Swift XRT Team Refined Analysis
  26. GRB 060204C: OSN limits
  27. GRB 060204b: Keck/LRIS Afterglow Confirmation
  28. GRB 060204C: BOOTES-IR optical limits
  29. GRB 060204C: Liverpool Telescopes optical limit
  30. GRB 060204C: ROTSE-III Optical Limits
  31. GRB 060204C: Swift-BAT detection of a burst
  32. GRB060204B: Faulkes OT candidate
  33. GRB 060204A: further INTEGRAL results
  34. GRB060204B - SDSS pre-burst observations
  35. GRB 060204B: Swift detection of a burst
  36. GRB 060204: a long GRB detected by INTEGRAL
  37. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  38. GRB 060203: RTT150 optical observations
  39. GRB060203: Swift XRT Team Refined Analysis
  40. GRB060203 - Swift UVOT observation
  41. Swift-BAT trigger is GRB 060203
  42. GRB 060203: IR Counterpart
  43. GRB060203: Observations with SARA
  44. Possible GRB 060203: candidate optical counterpart
  45. Swift BAT Trigger 180151: Swift XRT source detection
  46. Possible GRB 060203: optical observations at Asiago
  47. GRB 060202: PROMPT Observations
  48. Swift-BAT trigger 180151 is unknown origin at this time
  49. GRB 060202: GETS observation
  50. GRB 060202: Gemini-N J, H, K_s observations
  51. GRB 060202 : Kiso B and R band limit
  52. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  53. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  54. GRB 060202: Refined analysis of the Swift-BAT burst
  55. GRB 060202: Swift XRT Team Refined Analysis
  56. GRB 060202 : Lulin R and I band limit
  57. GRB 060202: Swift detection of a burst
  58. GRB 060121: Gemini Late-time Observations
  59. Erratum: SDSS pre-burst observations of GRB fields
  60. GRB 060130: PROMPT Observations
  61. GRB 060130: Swift/XRT observation
  62. GRB 051211A: MDM Observations
  63. GRB 060123: Gemini spectroscopy of the putative host galaxy
  64. GRB 060123: VLA Radio Observations
  65. GRB 060130, SMARTS optical observations
  66. GRB 060130: FRAM optical observations
  67. GRB 060130: further INTEGRAL IBIS results
  68. GRB 060130: a long GRB detected with INTEGRAL
  69. Possible GRB 051221B: MDM Correction
  70. GRB050121: optical observation
  71. GRB050121b: optical observation
  72. GRB 060121: Confirmation of NIR Afterglow
  73. GRB060124: optical observation
  74. GRB060124: optical observations
  75. GRB 060123: Swift refined analysis of an unusual GRB
  76. GRB060124, BVRcIc field calibration
  77. GRB060105: refined analysis of the Suzaku observation
  78. GRB060124 optical observations
  79. GRB 060121: Probable Detection of NIR Afterglow
  80. GRB060124: optical observation
  81. GRB 060116 HST observations
  82. GRB 060124: HETE detection and spectrum of the main peak
  83. Refined XRT Position for GRB 060123
  84. Konus-Wind observation of GRB 060124
  85. GRB060124: detailed XRT analysis
  86. GRB 060124 Optical Observations
  87. GRB 060124: ART optical limits during the burst
  88. GRB060123: Optical and IR Imaging
  89. GRB 060123: P200 Observations
  90. GRB 060124: Keck optical spectrum
  91. GRB 060124: Keck Absorption Redshift
  92. GRB 060124: MDM Optical Spectrum
  93. GRB 060124: XRT refined analysis
  94. GRB 060124: R band Observations
  95. GRB 060124 : Optical observation at Xinglong and Kiso
  96. GRB060124: optical observations at Asiago
  97. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  98. GRB060123: SDSS pre-burst observations
  99. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  100. GRB 060124: TAROT optical limits

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