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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"

42936 results found.

  1. GRB060204a: Swift XRT Source is not GRB Afterglow
  2. GRB 060206: optical observations at Asiago
  3. Orphan GRB Afterglow candidate
  4. GRB 060206: Subaru/FOCAS optical spectroscopy
  5. GRB 060206: IR Detection of the Afterglow
  6. GRB 060206: Lick 3m Spectroscopy
  7. GRB 060204A: ROSAT Pointing
  8. GRB 060206: Super-LOTIS observations
  9. GRB 060206: Swift-BAT refined analysis
  10. GRB 060206 : Lulin optical observations
  11. GRB060206: SDSS Pre-Burst Observations
  12. GRB060206: Swift XRT Refined Analysis
  13. GRB060206: Liverpool Telescope observation
  14. GRB 060206: Spectroscopic Redshift
  15. GRB060206: P60 Optical Observations
  16. GRB 060206: KAIT observations
  17. GRB060206: Swift XRT Position
  18. GRB060206: SARA Detection
  19. GRB 060206: RAPTOR observations of afterglow candidate variability.
  20. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  21. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  22. GRB060206: Swift-BAT detection of a burst
  23. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  24. GRB060204C: optical observation
  25. GRB 060204B: BVRi-band detections of optical afterglow
  26. GRB 060204A: Swift XRT upper limit
  27. GRB 060204A: FRAM optical observations
  28. GRB060204B: Swift/UVOT refined analysis
  29. Swift XRT Observation of GRB 060204C
  30. GRB 060204B: Swift-BAT refined analysis
  31. GRB060204B: Swift XRT Team Refined Analysis
  32. GRB 060204C: OSN limits
  33. GRB 060204b: Keck/LRIS Afterglow Confirmation
  34. GRB 060204C: BOOTES-IR optical limits
  35. GRB 060204C: Liverpool Telescopes optical limit
  36. GRB 060204C: ROTSE-III Optical Limits
  37. GRB 060204C: Swift-BAT detection of a burst
  38. GRB060204B: Faulkes OT candidate
  39. GRB 060204A: further INTEGRAL results
  40. GRB060204B - SDSS pre-burst observations
  41. GRB 060204B: Swift detection of a burst
  42. GRB 060204: a long GRB detected by INTEGRAL
  43. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  44. GRB 060203: RTT150 optical observations
  45. GRB060203: Swift XRT Team Refined Analysis
  46. GRB060203 - Swift UVOT observation
  47. Swift-BAT trigger is GRB 060203
  48. GRB 060203: IR Counterpart
  49. GRB060203: Observations with SARA
  50. Possible GRB 060203: candidate optical counterpart
  51. Swift BAT Trigger 180151: Swift XRT source detection
  52. Possible GRB 060203: optical observations at Asiago
  53. GRB 060202: PROMPT Observations
  54. Swift-BAT trigger 180151 is unknown origin at this time
  55. GRB 060202: GETS observation
  56. GRB 060202: Gemini-N J, H, K_s observations
  57. GRB 060202 : Kiso B and R band limit
  58. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  59. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  60. GRB 060202: Refined analysis of the Swift-BAT burst
  61. GRB 060202: Swift XRT Team Refined Analysis
  62. GRB 060202 : Lulin R and I band limit
  63. GRB 060202: Swift detection of a burst
  64. GRB 060121: Gemini Late-time Observations
  65. Erratum: SDSS pre-burst observations of GRB fields
  66. GRB 060130: PROMPT Observations
  67. GRB 060130: Swift/XRT observation
  68. GRB 051211A: MDM Observations
  69. GRB 060123: Gemini spectroscopy of the putative host galaxy
  70. GRB 060123: VLA Radio Observations
  71. GRB 060130, SMARTS optical observations
  72. GRB 060130: FRAM optical observations
  73. GRB 060130: further INTEGRAL IBIS results
  74. GRB 060130: a long GRB detected with INTEGRAL
  75. Possible GRB 051221B: MDM Correction
  76. GRB050121: optical observation
  77. GRB050121b: optical observation
  78. GRB 060121: Confirmation of NIR Afterglow
  79. GRB060124: optical observation
  80. GRB060124: optical observations
  81. GRB 060123: Swift refined analysis of an unusual GRB
  82. GRB060124, BVRcIc field calibration
  83. GRB060105: refined analysis of the Suzaku observation
  84. GRB060124 optical observations
  85. GRB 060121: Probable Detection of NIR Afterglow
  86. GRB060124: optical observation
  87. GRB 060116 HST observations
  88. GRB 060124: HETE detection and spectrum of the main peak
  89. Refined XRT Position for GRB 060123
  90. Konus-Wind observation of GRB 060124
  91. GRB060124: detailed XRT analysis
  92. GRB 060124 Optical Observations
  93. GRB 060124: ART optical limits during the burst
  94. GRB060123: Optical and IR Imaging
  95. GRB 060123: P200 Observations
  96. GRB 060124: Keck optical spectrum
  97. GRB 060124: Keck Absorption Redshift
  98. GRB 060124: MDM Optical Spectrum
  99. GRB 060124: XRT refined analysis
  100. GRB 060124: R band Observations

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