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"

36329 results found.

  1. GRB 060204C: OSN limits
  2. GRB 060204b: Keck/LRIS Afterglow Confirmation
  3. GRB 060204C: BOOTES-IR optical limits
  4. GRB 060204C: Liverpool Telescopes optical limit
  5. GRB 060204C: ROTSE-III Optical Limits
  6. GRB 060204C: Swift-BAT detection of a burst
  7. GRB 060124: Radio Observations
  8. GRB060204B: Faulkes OT candidate
  9. GRB 060204B: ART optical limit
  10. GRB 060204A: further INTEGRAL results
  11. GRB060204B - SDSS pre-burst observations
  12. GRB 060203: Swift-BAT refined analysis
  13. GRB 060204B: Swift detection of a burst
  14. GRB 060204: a long GRB detected by INTEGRAL
  15. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  16. GRB 060203: RTT150 optical observations
  17. GRB060203: Swift XRT Team Refined Analysis
  18. Swift-BAT trigger is GRB 060203
  19. GRB 060203: IR Counterpart
  20. GRB060203: Observations with SARA
  21. GRB 060203: P60 Confirmation of Optical Afterglow
  22. Possible GRB 060203: candidate optical counterpart
  23. Possible GRB 060203: optical observations at Asiago
  24. GRB 060202: PROMPT Observations
  25. GRB 060202: GETS observation
  26. GRB 060202: Gemini-N J, H, K_s observations
  27. GRB 060202 : Kiso B and R band limit
  28. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  29. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  30. GRB 060202: Refined analysis of the Swift-BAT burst
  31. GRB 060202: Swift/UVOT upper limits
  32. GRB 060202: Swift XRT Team Refined Analysis
  33. GRB 060202 : Lulin R and I band limit
  34. GRB060202: Faulkes North observation
  35. GRB 060202: Swift detection of a burst
  36. GRB 060121: Gemini Late-time Observations
  37. Erratum: SDSS pre-burst observations of GRB fields
  38. GRB 060130: PROMPT Observations
  39. GRB 060130: Swift/XRT observation
  40. GRB 051211A: MDM Observations
  41. GRB 060123: Gemini spectroscopy of the putative host galaxy
  42. GRB 060123: VLA Radio Observations
  43. GRB060130: Optical imaging
  44. GRB060130: REM infrared observations
  45. GRB 060130, SMARTS optical observations
  46. GRB 060130: FRAM optical observations
  47. GRB 060130: further INTEGRAL IBIS results
  48. GRB 060130: a long GRB detected with INTEGRAL
  49. Possible GRB 051221B: MDM Correction
  50. GRB050121: optical observation
  51. GRB050121b: optical observation
  52. GRB 060121: Confirmation of NIR Afterglow
  53. GRB060124: optical observation
  54. GRB060124: optical observations
  55. GRB 060123: Swift refined analysis of an unusual GRB
  56. GRB060124, BVRcIc field calibration
  57. GRB060105: refined analysis of the Suzaku observation
  58. GRB060124 optical observations
  59. GRB 060121: Probable Detection of NIR Afterglow
  60. GRB060124: optical observation
  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 060124: ART optical limits during the burst
  68. GRB060123: Optical and IR Imaging
  69. GRB 060123: P200 Observations
  70. GRB 060124: Keck optical spectrum
  71. GRB 060124: Keck Absorption Redshift
  72. GRB 060124: MDM Optical Spectrum
  73. GRB 060124: XRT refined analysis
  74. GRB 060124: R band Observations
  75. GRB 060124 : Optical observation at Xinglong and Kiso
  76. GRB060124: optical observations at Asiago
  77. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  78. GRB060123: SDSS pre-burst observations
  79. GRB 060123: Swift detection of a very long, faint burst
  80. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  81. GRB 060121: OHP optical limits
  82. GRB 060124: TAROT optical limits
  83. GRB 060124: Swift/UVOT Observation
  84. GRB 060124: Confirmation of the Afterglow
  85. GRB 060124: XRT position
  86. GRB 060124: Optical Afterglow Candidate from Tautenburg
  87. GRB 050124 : Kiso Optical limit
  88. GRB 060124: Optical Observations at Tautenburg
  89. GRB 060117: Suzaku WAM observation of the prompt emission
  90. GRB060124:MASTER optical observation
  91. GRB 060111B: Suzaku WAM observation of the prompt emission
  92. GRB 060124: Swift-BAT detection of a burst
  93. GRB 060116: Radio Detection
  94. GRB 060116: MARGE optical observations
  95. GRB 060121: Swift/UVOT upper limits
  96. GRB 060121: Liverpool Telescopes optical limits
  97. GRB 060121: Swift XRT refined analysis
  98. Konus-Wind observation of GRB 060121
  99. GRB 060121: I-band Limits
  100. GRB 060121: Confirmation of Afterglow

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