Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

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"

36151 results found.

  1. GRB060206: Swift XRT Refined Analysis
  2. GRB060206: Liverpool Telescope observation
  3. GRB 060206: Spectroscopic Redshift
  4. GRB060206: P60 Optical Observations
  5. GRB 060206: KAIT observations
  6. GRB060206: Swift XRT Position
  7. GRB060206: SARA Detection
  8. GRB 060206: RAPTOR observations of afterglow candidate variability.
  9. GRB 060206: High redshift burst
  10. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  11. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  12. BAT GRB 060204C is probably not a GRB
  13. GRB060204C: optical observation
  14. GRB 060204B: BVRi-band detections of optical afterglow
  15. GRB 060204A: Swift XRT upper limit
  16. GRB 060204A: FRAM optical observations
  17. GRB060204B: Swift/UVOT refined analysis
  18. GRB 060204C: optical observations
  19. Swift XRT Observation of GRB 060204C
  20. GRB 060204B: Swift-BAT refined analysis
  21. GRB 060204B: ART early limit
  22. GRB060204B: Swift XRT Team Refined Analysis
  23. GRB 060204C: OSN limits
  24. GRB 060204b: Keck/LRIS Afterglow Confirmation
  25. GRB 060204C: BOOTES-IR optical limits
  26. GRB 060204C: Liverpool Telescopes optical limit
  27. GRB 060204C: ROTSE-III Optical Limits
  28. GRB 060204C: Swift-BAT detection of a burst
  29. GRB 060124: Radio Observations
  30. GRB060204B: Faulkes OT candidate
  31. GRB 060204B: ART optical limit
  32. GRB 060204A: further INTEGRAL results
  33. GRB060204B - SDSS pre-burst observations
  34. GRB 060203: Swift-BAT refined analysis
  35. GRB 060204B: Swift detection of a burst
  36. GRB 060204: a long GRB detected by INTEGRAL
  37. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  38. GRB 060203: RTT150 optical observations
  39. GRB060203: Swift XRT Team Refined Analysis
  40. Swift-BAT trigger is GRB 060203
  41. GRB 060203: IR Counterpart
  42. GRB060203: Observations with SARA
  43. GRB 060203: P60 Confirmation of Optical Afterglow
  44. Possible GRB 060203: candidate optical counterpart
  45. Possible GRB 060203: optical observations at Asiago
  46. GRB 060202: PROMPT Observations
  47. GRB 060202: GETS observation
  48. GRB 060202: Gemini-N J, H, K_s observations
  49. GRB 060202 : Kiso B and R band limit
  50. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  51. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  52. GRB 060202: Refined analysis of the Swift-BAT burst
  53. GRB 060202: Swift/UVOT upper limits
  54. GRB 060202: Swift XRT Team Refined Analysis
  55. GRB 060202 : Lulin R and I band limit
  56. GRB060202: Faulkes North observation
  57. GRB 060202: Swift detection of a burst
  58. GRB 060121: Gemini Late-time Observations
  59. Erratum: SDSS pre-burst observations of GRB fields
  60. GRB 060130: PROMPT Observations
  61. GRB 060130: Swift/XRT observation
  62. GRB 051211A: MDM Observations
  63. GRB 060123: Gemini spectroscopy of the putative host galaxy
  64. GRB 060123: VLA Radio Observations
  65. GRB060130: Optical imaging
  66. GRB060130: REM infrared observations
  67. GRB 060130, SMARTS optical observations
  68. GRB 060130: FRAM optical observations
  69. GRB 060130: further INTEGRAL IBIS results
  70. GRB 060130: a long GRB detected with INTEGRAL
  71. Possible GRB 051221B: MDM Correction
  72. GRB050121: optical observation
  73. GRB050121b: optical observation
  74. GRB 060121: Confirmation of NIR Afterglow
  75. GRB060124: optical observation
  76. GRB060124: optical observations
  77. GRB 060123: Swift refined analysis of an unusual GRB
  78. GRB060124, BVRcIc field calibration
  79. GRB060105: refined analysis of the Suzaku observation
  80. GRB060124 optical observations
  81. GRB 060121: Probable Detection of NIR Afterglow
  82. GRB060124: optical observation
  83. GRB 060116 HST observations
  84. GRB 060124: HETE detection and spectrum of the main peak
  85. Refined XRT Position for GRB 060123
  86. Konus-Wind observation of GRB 060124
  87. GRB060124: detailed XRT analysis
  88. GRB 060124 Optical Observations
  89. GRB 060124: ART optical limits during the burst
  90. GRB060123: Optical and IR Imaging
  91. GRB 060123: P200 Observations
  92. GRB 060124: Keck optical spectrum
  93. GRB 060124: Keck Absorption Redshift
  94. GRB 060124: MDM Optical Spectrum
  95. GRB 060124: XRT refined analysis
  96. GRB 060124: R band Observations
  97. GRB 060124 : Optical observation at Xinglong and Kiso
  98. GRB060124: optical observations at Asiago
  99. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  100. GRB060123: SDSS pre-burst observations

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