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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19549 results found.

  1. GRB 060210: Optical Observations
  2. GRB 060211B: Swift-BAT detection of a burst
  3. GRB 060211: Swift detection of a long burst
  4. GRB 060210: Swift detection of a burst
  5. GRB060210: Optical afterglow
  6. GRB 060209 : TAROT optical observation
  7. GRB 060209(?): Swift-BAT detection of a possible burst
  8. GRB 060206: WSRT Radio Observations
  9. GRB 060203: Swift/UVOT upper limits
  10. GRB 060121 : WIDGET Pre-trigger limit
  11. GRB060204a: Swift XRT Source is not GRB Afterglow
  12. GRB 060206: IR Detection of the Afterglow
  13. GRB 060204A: ROSAT Pointing
  14. GRB060204A: Swift/UVOT observations
  15. GRB 060206: Swift-BAT refined analysis
  16. GRB060206: SDSS Pre-Burst Observations
  17. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  18. GRB060206: Swift-BAT detection of a burst
  19. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  20. GRB060204C: optical observation
  21. GRB 060204A: Swift XRT upper limit
  22. GRB 060204A: FRAM optical observations
  23. GRB060204B: Swift/UVOT refined analysis
  24. GRB 060204C: optical observations
  25. Swift XRT Observation of GRB 060204C
  26. GRB 060204B: ART early limit
  27. GRB 060204b: Keck/LRIS Afterglow Confirmation
  28. GRB 060204C: Liverpool Telescopes optical limit
  29. GRB 060204C: Swift-BAT detection of a burst
  30. GRB060204B, optical observation
  31. GRB060204B - SDSS pre-burst observations
  32. GRB 060204B: Swift detection of a burst
  33. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  34. GRB 060203: RTT150 optical observations
  35. GRB 060203: IR Counterpart
  36. Possible GRB 060203: optical observations at Asiago
  37. GRB 060202: Gemini-N J, H, K_s observations
  38. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  39. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  40. GRB060202, optical observation
  41. GRB 060202: Swift/UVOT upper limits
  42. GRB 060202: Swift XRT Team Refined Analysis
  43. GRB 060202: Swift detection of a burst
  44. GRB 060121: Gemini Late-time Observations
  45. GRB060130: Further R-band imaging
  46. GRB 060130: Swift/XRT observation
  47. GRB 060123: Gemini spectroscopy of the putative host galaxy
  48. GRB060130: Optical imaging
  49. GRB060130: REM infrared observations
  50. GRB 060130, SMARTS optical observations
  51. GRB 060130: FRAM optical observations
  52. GRB 060130: further INTEGRAL IBIS results
  53. Possible GRB 051221B: MDM Correction
  54. GRB 060121: Confirmation of NIR Afterglow
  55. GRB060124, BVRcIc field calibration
  56. GRB060105: refined analysis of the Suzaku observation
  57. GRB 060121: Probable Detection of NIR Afterglow
  58. GRB 060116 HST observations
  59. GRB 060124: ART optical limits during the burst
  60. GRB060123: Optical and IR Imaging
  61. GRB 060123: P200 Observations
  62. GRB 060124: R band Observations
  63. GRB 060124 : Optical observation at Xinglong and Kiso
  64. GRB060123: SDSS pre-burst observations
  65. GRB 060121: OHP optical limits
  66. GRB 060124: TAROT optical limits
  67. GRB060124, optical observation
  68. GRB 060124: Optical Observations at Tautenburg
  69. GRB 060124: Swift-BAT detection of a burst
  70. GRB 060121: Liverpool Telescopes optical limits
  71. GRB 060121: candidate optical counterpart
  72. GRB 060121: Infrared Observations
  73. GRB 060121: optical observations
  74. GRB 060121: Optical imaging
  75. GRB060121 - SDSS pre-burst observations
  76. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  77. HETE Alert 4006: MASTER promt optical limit
  78. GRB060117 - ATCA 3/6cm radio limits - correction
  79. GRB060117 - ATCA 3/6cm radio limits
  80. GRB 060116: possible I-J dropout
  81. GRB 060116: UKIRT IR Observations
  82. GRB 060117: FRAM optical afterglow candidate
  83. GRB 060117: nearby galaxy
  84. GRB 060116: VLT optical observations
  85. GRB 060116: IR Candidate Afterglow
  86. GRB 060116: Swift/UVOT upper limits
  87. GRB060115: REM observations
  88. GRB060116: Faulkes North observation
  89. GRB 060116: Swift-BAT detection of a burst
  90. GRB 060115: Swift/UVOT upper limits
  91. GRB 060114: REM observations
  92. GRB 060114: Swift/UVOT Observations
  93. GRB060115, optical observation
  94. GRB 060115: MITSuME optical afterglow candidate
  95. GRB 060115: Swift detection of a burst
  96. GRB060114, optical observation
  97. GRB060114: Faulkes North observation
  98. GRB 060108: IR observations of afterglow
  99. GRB 060108: Evidence for an XRT Position Offset
  100. GRB 060110: KAIT observations

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