Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

26509 results found.

  1. GRB 060211B: Swift/BAT refined analysis
  2. GRB060210: Swift/UVOT Upper Limits
  3. GRB 060210: Optical Observations
  4. GRB060211.7: MASTER_optical_observation under the snow
  5. GRB 060210: Refined analysis of the Swift-BAT burst
  6. GRB060210: Swift XRT Refined Analysis
  7. GRB060206, optical observations
  8. GRB060210: Early Optical Observations
  9. GRB060210: Optical afterglow
  10. GRB 060209 : TAROT optical observation
  11. GRB060209A: MASTER optical observation
  12. GRB 060203: Swift/UVOT upper limits
  13. GRB 060121 : WIDGET Pre-trigger limit
  14. Retraction of orphan GRB afterglow candidate
  15. Orphan GRB Afterglow candidate
  16. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  17. GRB 060206: IR Detection of the Afterglow
  18. GRB 060204A: ROSAT Pointing
  19. GRB060204A: Swift/UVOT observations
  20. GRB 060206: Swift-BAT refined analysis
  21. GRB060206: SDSS Pre-Burst Observations
  22. GRB060206: P60 Optical Observations
  23. GRB 060206: KAIT observations
  24. GRB060206: SARA Detection
  25. GRB 060206: RAPTOR observations of afterglow candidate variability.
  26. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  27. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  28. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  29. BAT GRB 060204C is probably not a GRB
  30. GRB060204B: Swift/UVOT refined analysis
  31. GRB 060204B: Swift-BAT refined analysis
  32. GRB060204B: Swift XRT Team Refined Analysis
  33. GRB 060204b: Keck/LRIS Afterglow Confirmation
  34. GRB 060204C: Liverpool Telescopes optical limit
  35. GRB 060124: Radio Observations
  36. GRB060204B - SDSS pre-burst observations
  37. GRB 060203: Swift-BAT refined analysis
  38. GRB 060204B: Swift detection of a burst
  39. GRB 060204: a long GRB detected by INTEGRAL
  40. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  41. GRB 060203: RTT150 optical observations
  42. GRB 060203: P60 Confirmation of Optical Afterglow
  43. GRB 060202: GETS observation
  44. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  45. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  46. GRB 060202: Refined analysis of the Swift-BAT burst
  47. GRB 060202: Swift XRT Team Refined Analysis
  48. GRB 060202: Swift detection of a burst
  49. GRB 060121: Gemini Late-time Observations
  50. GRB060130: Further R-band imaging
  51. GRB 051211A: MDM Observations
  52. GRB 060123: VLA Radio Observations
  53. GRB 060130: a long GRB detected with INTEGRAL
  54. Possible GRB 051221B: MDM Correction
  55. GRB050121b: optical observation
  56. GRB 060121: Confirmation of NIR Afterglow
  57. GRB 060123: Swift refined analysis of an unusual GRB
  58. GRB060105: refined analysis of the Suzaku observation
  59. GRB060124 optical observations
  60. GRB 060121: Probable Detection of NIR Afterglow
  61. GRB 060116 HST observations
  62. GRB 060124: HETE detection and spectrum of the main peak
  63. Refined XRT Position for GRB 060123
  64. Konus-Wind observation of GRB 060124
  65. GRB060124: detailed XRT analysis
  66. GRB 060124 Optical Observations
  67. GRB 060123: P200 Observations
  68. GRB 060124: Keck optical spectrum
  69. GRB 060124: Keck Absorption Redshift
  70. GRB 060124 : Optical observation at Xinglong and Kiso
  71. GRB060124: optical observations at Asiago
  72. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  73. GRB060123: SDSS pre-burst observations
  74. GRB 060121: OHP optical limits
  75. GRB 060124: TAROT optical limits
  76. GRB 060124: Swift/UVOT Observation
  77. GRB 060124: XRT position
  78. GRB 060117: Suzaku WAM observation of the prompt emission
  79. GRB060124:MASTER optical observation
  80. GRB 060111B: Suzaku WAM observation of the prompt emission
  81. GRB 060124: Swift-BAT detection of a burst
  82. GRB 060116: Radio Detection
  83. GRB 060116: MARGE optical observations
  84. GRB 060121: Liverpool Telescopes optical limits
  85. GRB 060121: Swift XRT refined analysis
  86. Konus-Wind observation of GRB 060121
  87. GRB 060121: optical observations
  88. GRB060121 - SDSS pre-burst observations
  89. GRB 060121 (=H4010): Results of preliminary spectral analysis
  90. GRB 060121: A bright short/hard GRB localized by HETE-2 SXC
  91. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  92. HETE Alert 4006: MASTER promt optical limit
  93. GRB 060117: PROMPT Observations
  94. GRB 060116: photometric redshift - the farthest GRB?
  95. GRB 060117: pseudo-z from spectral parameters of the prompt emission
  96. Konus-Wind observation of GRB 060117
  97. GRB 060116: possible I-J dropout
  98. GRB 060116: UKIRT IR Observations
  99. GRB 060117: Refined analysis of the Swift-BAT burst
  100. GRB 060117: FRAM refined analysis

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