Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

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"

41948 results found.

  1. GRB060206: Swift-BAT detection of a burst
  2. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  3. GRB060203: WHT Z-band observations
  4. BAT GRB 060204C is probably not a GRB
  5. GRB060204C: optical observation
  6. GRB 060204A: Swift XRT upper limit
  7. GRB 060204A: FRAM optical observations
  8. GRB060204B: Swift/UVOT refined analysis
  9. GRB 060204C: optical observations
  10. Swift XRT Observation of GRB 060204C
  11. GRB 060204B: Swift-BAT refined analysis
  12. GRB060204B: Swift XRT Team Refined Analysis
  13. GRB 060204C: OSN limits
  14. GRB 060204b: Keck/LRIS Afterglow Confirmation
  15. GRB 060204C: Swift-BAT detection of a burst
  16. GRB 060124: Radio Observations
  17. GRB060204B: Faulkes OT candidate
  18. GRB 060204B: ART optical limit
  19. GRB060204B, optical observation
  20. GRB060204B - SDSS pre-burst observations
  21. GRB 060204B: Swift detection of a burst
  22. GRB 060204: a long GRB detected by INTEGRAL
  23. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  24. GRB 060203: RTT150 optical observations
  25. GRB060203: Swift XRT Team Refined Analysis
  26. GRB060203 - Swift UVOT observation
  27. GRB 060203: IR Counterpart
  28. GRB060203: Observations with SARA
  29. GRB 060203: P60 Confirmation of Optical Afterglow
  30. Possible GRB 060203: candidate optical counterpart
  31. Possible GRB 060203: optical observations at Asiago
  32. GRB 060202: PROMPT Observations
  33. GRB 060202: Gemini-N J, H, K_s observations
  34. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  35. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  36. GRB 060202: Refined analysis of the Swift-BAT burst
  37. GRB060202, optical observation
  38. GRB 060202: Swift XRT Team Refined Analysis
  39. GRB060202: Faulkes North observation
  40. GRB 060202: Swift detection of a burst
  41. GRB 060121: Gemini Late-time Observations
  42. Erratum: SDSS pre-burst observations of GRB fields
  43. GRB 060130: PROMPT Observations
  44. GRB 051211A: MDM Observations
  45. GRB 060123: Gemini spectroscopy of the putative host galaxy
  46. GRB 060123: VLA Radio Observations
  47. GRB060130: Optical imaging
  48. GRB060130: REM infrared observations
  49. GRB 060130, SMARTS optical observations
  50. GRB 060130: FRAM optical observations
  51. GRB 060130: a long GRB detected with INTEGRAL
  52. Possible GRB 051221B: MDM Correction
  53. GRB050121: optical observation
  54. GRB050121b: optical observation
  55. GRB 060121: Confirmation of NIR Afterglow
  56. GRB060124: optical observation
  57. GRB060124: optical observations
  58. GRB 060123: Swift refined analysis of an unusual GRB
  59. GRB060124, BVRcIc field calibration
  60. GRB060105: refined analysis of the Suzaku observation
  61. GRB060124 optical observations
  62. GRB 060121: Probable Detection of NIR Afterglow
  63. GRB060124: optical observation
  64. GRB 060116 HST observations
  65. GRB 060124: HETE detection and spectrum of the main peak
  66. Refined XRT Position for GRB 060123
  67. Konus-Wind observation of GRB 060124
  68. GRB060124: detailed XRT analysis
  69. GRB 060124 Optical Observations
  70. GRB 060124: ART optical limits during the burst
  71. GRB060123: Optical and IR Imaging
  72. GRB 060123: P200 Observations
  73. GRB 060124: Keck optical spectrum
  74. GRB 060124: Keck Absorption Redshift
  75. GRB 060124: MDM Optical Spectrum
  76. GRB 060124: XRT refined analysis
  77. GRB 060124: R band Observations
  78. GRB060124: optical observations at Asiago
  79. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  80. GRB060123: SDSS pre-burst observations
  81. GRB 060123: Swift detection of a very long, faint burst
  82. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  83. GRB 060121: OHP optical limits
  84. GRB 060124: TAROT optical limits
  85. GRB 060124: Confirmation of the Afterglow
  86. GRB 060124: XRT position
  87. GRB 060124: Optical Afterglow Candidate from Tautenburg
  88. GRB060124, optical observation
  89. GRB 050124 : Kiso Optical limit
  90. GRB 060124: Optical Observations at Tautenburg
  91. GRB 060117: Suzaku WAM observation of the prompt emission
  92. GRB 060111B: Suzaku WAM observation of the prompt emission
  93. GRB 060124: Swift-BAT detection of a burst
  94. GRB 060116: Radio Detection
  95. GRB 060116: MARGE optical observations
  96. GRB 060121: Swift/UVOT upper limits
  97. GRB 060121: Liverpool Telescopes optical limits
  98. GRB 060121: Swift XRT refined analysis
  99. Konus-Wind observation of GRB 060121
  100. GRB 060121: I-band Limits

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov