Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

35268 results found.

  1. VLA observation of GRB 070220
  2. GRB070224: Magellan Imaging Observations
  3. GRB 070224: WHT K-band imaging
  4. GRB 070224: MDM Observations
  5. GRB 070224: SARA upper limit
  6. GRB070224: Swift-XRT Refined Analysis
  7. GRB 070224: optical afterglow candidate
  8. GRB 070224, Swift-BAT refined analysis
  9. GRB 070224: MASTER-Net refind analysis
  10. GRB 070224: MASTER-VWF-Kislovodsk observations
  11. GRB 070224: MASTER observations
  12. GRB 070224: Swift detection of a burst
  13. GRB 070223: Optical observations
  14. GRB070223: Swift/UVOT refined analysis
  15. GRB 070223: Optical-IR observation with KANATA
  16. GRB 070223, Swift-BAT refined analysis
  17. GRB 070223: Swift-XRT Refined Analysis
  18. GRB 070220: pseudo-z~2.15 from spectral parameters of the prompt
  19. GRB070223 - SDSS Pre-Burst Observations
  20. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  21. GRB 070223: MDM Observations
  22. GRB070223: Swift burst
  23. Konus-Wind and Konus-A observations of GRB 070220
  24. GRB 070220: MITSuME Okayama Optical Observation
  25. GRB 070220: ART-3 Optical and NIR limits
  26. GRB 070220 Swift-BAT Refined Analysis
  27. Swift/UVOT refined analysis of GRB070220
  28. GRB 070209: Swift XRT refined analysis
  29. GRB 070220: Swift-XRT Refined Analysis
  30. GRB 070220: Observation with the KANATA 1.5m telescope
  31. GRB 070219: Gemini Observations
  32. GRB 070220 : Faulkes Telescope North optical limit
  33. GRB 070220: Swift detection of a burst
  34. GRB070219: MASTER-VWF-Kislovodsk observations
  35. GRB 070219: XRT Refined Analysis
  36. GRB 070219: Swift/UVOT Upper limits
  37. GRB 070219: I-band observations
  38. GRB 070219, Swift-BAT refined analysis
  39. GRB 070219: optical TNG observations
  40. GRB 070219: Liverpool Telescope Observations
  41. GRB 070219: ROTSE-III Optical Limits
  42. GRB070219 - SDSS Pre-Burst Observations
  43. GRB 070219: Swift detection of a burst
  44. IPN triangulation of GRB070201 (refined error box using MESSENGER data)
  45. GRB 070125 observations with the GMRT
  46. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  47. Swift-BAT trigger 260304 is NOT a burst or transient
  48. GRB 060927: PROMPT Observations
  49. GRB 070201: Correction to GCN 6094
  50. GRB 070129: MDM I-band Detection
  51. GRB 070125: Break in Optical Decay
  52. GRB 070209: Swift XRT analysis
  53. GRB 070201: clarification on localization and Konus-Wind spectra
  54. GRB070208: optical observations
  55. GRB 070201: IPN constraints and nearby galaxies
  56. GRB 070201: Proximity of IPN annulus to M31
  57. GRB 070208: MARGE Optical Observations
  58. IPN localization of very bright long hard GRB 070207
  59. IPN localization of very intense short GRB 070201
  60. GRB 070209, Swift-BAT refined analysis of the short hard burst
  61. GRB 070209: Swift detection of a short hard burst
  62. GRB 070208: Swift XRT refined analysis
  63. GRB 070208: RAPTOR detection of early afterglow onset
  64. GRB070208: Absorption and emission redshift from Gemini
  65. GRB 070208: MDM Optical Decay
  66. GRB 070208, Swift-BAT refined analysis
  67. GRB070208 - SDSS Pre-Burst Observations
  68. GRB 070208: Early IR detection and afterglow astrometry
  69. GRB 070208: Afterglow confirmation from P60
  70. GRB070208: Faulkes Telescope North Afterglow Identification
  71. GRB 070208: ROTSE-III Optical Limits
  72. GRB 070208: MDM Observations
  73. GRB 070208: Swift detection of a burst
  74. GRB 070125 detection with CARMA
  75. Swift-BAT trigger 259527 is a Cosmic Ray Shower
  76. GRB 070125: Redshift z>~1.54 from Gemini Afterglow Spectrum
  77. GRB 070129: afterglow confirmation
  78. GRB070124: Swift-XRT Follow-up Observation
  79. GRB070126: Swift-XRT Observation
  80. GRB 070125: further AAVSO optical observations
  81. GRB 070129: Swift/UVOT Upper limits
  82. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  83. GRB 070125: optical observation
  84. GRB 070125: WSRT Radio Detection
  85. Radio detection of GRB 070125
  86. GRB061217: MAGIC telescope GeV observation
  87. GRB 070125: confirmation of pseudo-redshift
  88. GRB 070129, Swift-BAT refined analysis of a particularly long
  89. GRB 070129: Xinglong TNT optical Upper Limit
  90. GRB 070129: Swift-XRT Refined Analysis
  91. GRB 070129: VLT observations
  92. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  93. GRB 070129: Swift detection of a burst
  94. GRB 070126: Swift/UVOT refined analysis
  95. GRB 070125: further AAVSO optical observations
  96. GRB 070125: MITSuME Okayama optical observation
  97. Konus-Wind observation of GRB 070125
  98. GRB 070125: AAVSO optical observations
  99. GRB 070125: optical observations
  100. GRB 070126: VLT observations

Advanced

Download all Circulars as a .tar.gz archive:
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