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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"

36363 results found.

  1. GRB 060206: optical observations at Asiago
  2. Orphan GRB Afterglow candidate
  3. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  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. GRB060204A: Swift/UVOT observations
  10. GRB 060206: Swift-BAT refined analysis
  11. GRB 060206 : Lulin optical observations
  12. GRB060206: SDSS Pre-Burst Observations
  13. GRB060206: Swift XRT Refined Analysis
  14. GRB060206: Liverpool Telescope observation
  15. GRB 060206: Spectroscopic Redshift
  16. GRB060206: P60 Optical Observations
  17. GRB 060206: KAIT observations
  18. GRB060206: Swift XRT Position
  19. GRB060206: SARA Detection
  20. GRB 060206: RAPTOR observations of afterglow candidate variability.
  21. GRB 060206: High redshift burst
  22. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  23. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  24. BAT GRB 060204C is probably not a GRB
  25. GRB060204C: optical observation
  26. GRB 060204B: BVRi-band detections of optical afterglow
  27. GRB 060204A: Swift XRT upper limit
  28. GRB 060204A: FRAM optical observations
  29. GRB060204B: Swift/UVOT refined analysis
  30. GRB 060204C: optical observations
  31. Swift XRT Observation of GRB 060204C
  32. GRB 060204B: Swift-BAT refined analysis
  33. GRB 060204B: ART early limit
  34. GRB060204B: Swift XRT Team Refined Analysis
  35. GRB 060204C: OSN limits
  36. GRB 060204b: Keck/LRIS Afterglow Confirmation
  37. GRB 060204C: BOOTES-IR optical limits
  38. GRB 060204C: Liverpool Telescopes optical limit
  39. GRB 060204C: ROTSE-III Optical Limits
  40. GRB 060204C: Swift-BAT detection of a burst
  41. GRB 060124: Radio Observations
  42. GRB060204B: Faulkes OT candidate
  43. GRB 060204B: ART optical limit
  44. GRB 060204A: further INTEGRAL results
  45. GRB060204B - SDSS pre-burst observations
  46. GRB 060203: Swift-BAT refined analysis
  47. GRB 060204B: Swift detection of a burst
  48. GRB 060204: a long GRB detected by INTEGRAL
  49. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  50. GRB 060203: RTT150 optical observations
  51. GRB060203: Swift XRT Team Refined Analysis
  52. Swift-BAT trigger is GRB 060203
  53. GRB 060203: IR Counterpart
  54. GRB060203: Observations with SARA
  55. GRB 060203: P60 Confirmation of Optical Afterglow
  56. Possible GRB 060203: candidate optical counterpart
  57. Possible GRB 060203: optical observations at Asiago
  58. GRB 060202: PROMPT Observations
  59. GRB 060202: GETS observation
  60. GRB 060202: Gemini-N J, H, K_s observations
  61. GRB 060202 : Kiso B and R band limit
  62. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  63. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  64. GRB 060202: Refined analysis of the Swift-BAT burst
  65. GRB 060202: Swift/UVOT upper limits
  66. GRB 060202: Swift XRT Team Refined Analysis
  67. GRB 060202 : Lulin R and I band limit
  68. GRB060202: Faulkes North observation
  69. GRB 060202: Swift detection of a burst
  70. GRB 060121: Gemini Late-time Observations
  71. Erratum: SDSS pre-burst observations of GRB fields
  72. GRB 060130: PROMPT Observations
  73. GRB 060130: Swift/XRT observation
  74. GRB 051211A: MDM Observations
  75. GRB 060123: Gemini spectroscopy of the putative host galaxy
  76. GRB 060123: VLA Radio Observations
  77. GRB060130: Optical imaging
  78. GRB060130: REM infrared observations
  79. GRB 060130, SMARTS optical observations
  80. GRB 060130: FRAM optical observations
  81. GRB 060130: further INTEGRAL IBIS results
  82. GRB 060130: a long GRB detected with INTEGRAL
  83. Possible GRB 051221B: MDM Correction
  84. GRB050121: optical observation
  85. GRB050121b: optical observation
  86. GRB 060121: Confirmation of NIR Afterglow
  87. GRB060124: optical observation
  88. GRB060124: optical observations
  89. GRB 060123: Swift refined analysis of an unusual GRB
  90. GRB060124, BVRcIc field calibration
  91. GRB060105: refined analysis of the Suzaku observation
  92. GRB060124 optical observations
  93. GRB 060121: Probable Detection of NIR Afterglow
  94. GRB060124: optical observation
  95. GRB 060116 HST observations
  96. GRB 060124: HETE detection and spectrum of the main peak
  97. Refined XRT Position for GRB 060123
  98. Konus-Wind observation of GRB 060124
  99. GRB060124: detailed XRT analysis
  100. GRB 060124 Optical Observations

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