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"

21966 results found.

  1. GRB 060825: GORT Observations
  2. GRB 061007: Second Epoch ATCA Radio Observations
  3. GRB 061006: astrometry-corrected XRT position
  4. GRB 061007: ATCA Radio Observations
  5. GRB061007: Swift UVOT followup observations
  6. GRB 061006: optical afterglow
  7. GRB 061007: Magellan Spectroscopy
  8. GRB 061006: Swift/UVOT optical observations
  9. GRB 061007 - FTS early brightening and power law decay
  10. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  11. GRB 061007: ROTSE-III Detection of Optical Counterpart
  12. GRB 061006: VLT observation
  13. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  14. GRB061006: Faulkes Telescope South Observations
  15. GRB 061004: Las Campanas Optical/NIR Observations
  16. GRB061004: Swift/UVOT optical observations
  17. GRB 061004: Nearby 2MASS Galaxy
  18. GRB 060928: Swift observations
  19. GRB061002: Swift UVOT followup observations
  20. VLA observations of GRB 060926
  21. GRB061002 - SDSS Pre-Burst Observations
  22. GRB061002: MASTER-VWF-Kislovodsk observations
  23. GRB 060908: Detection of a possible host
  24. GRB 060923A: Probable host galaxy in the R-band
  25. GRB 060807: Detection of a possible host galaxy
  26. GRB 060923A: VLA K-band Observations
  27. GRB 060930: Xinglong TNT optical observations
  28. GRB 060929: Swift/UVOT Optical Observations
  29. GRB 060929: TNG K-band observations
  30. GRB 060929: MASTER-VWF-Kislovodsk observations
  31. GRB 060929: BOOTES-IR & OSN observations
  32. Liverpool Telescope observations of GRB 060929
  33. GRB060908: optical observations
  34. GRB 060729: An update on the late-time Swift observations
  35. GRB060927: optical observations
  36. GRB 060927: Swift/UVOT Optical Observations
  37. GRB 060927: Xinglong TNT optical observations
  38. GRB 060927: Possible host galaxy (star?) in the SDSS
  39. GRB 060927 : Kiso optical observation
  40. GRB060927: Faulkes Telescope South observation
  41. GRB 060926: MASTER: first minutes decay
  42. GRB060927 - SDSS Pre-Burst Observations
  43. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  44. GRB 060927: Swift detection of a burst
  45. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  46. GRB 060926: OPTIMA-Burst -- further observations
  47. GRB 060923A: Radio Observations
  48. GRB 060912A: Redshift of probable host galaxy
  49. GRB 060926: BOOTES-IR observations
  50. GRB 060926: Watcher observations
  51. GRB 060923C: Gemini Observations and Afterglow Candidate
  52. GRB 060923C: VLT J-band observations
  53. GRB 060923C: Keck Observations
  54. GRB 060923A: Keck and Gemini Observations
  55. GRB 060923C: Xinglong TNT optical observations
  56. GRB060923C : Faulkes Telescope South optical limits
  57. GRB060923C: Faulkes Telescope North optical observations
  58. GRB 060923: Early Super-LOTIS Observations
  59. GRB 060923: UKIRT nIR observations - candidate afterglow
  60. GRB060923: Faulkes Telescope North optical observations
  61. GRB060923 - SDSS Pre-Burst Observations
  62. GRB 060923: KAIT observations
  63. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  64. GRB060919: Swift/UVOT optical observations
  65. GRB 060919 : Faulkes South Telescope Observations
  66. GRB 060919: TAROT optical observations
  67. GRB 060912A: Probable Host Galaxy
  68. GRB 060912: Redshift of nearby 2MASS galaxy
  69. GRB060912: optical observations
  70. GRB 060912B: Watcher observations
  71. GRB060912: Swift/UVOT Observations
  72. GRB060912: OPTIMA-Burst optical observations
  73. GRB 060912: Xinglong TNT optical observations
  74. GRB 060912: Swift detection of a burst with an optical afterglow
  75. GRB060906: Danish/DFOSC optical observations
  76. VLA observations of GRB 060908
  77. GRB 060908: redshift
  78. GRB 060908: Swift/UVOT Observations
  79. GRB 060908: Danish/DFOSC optical observations
  80. GRB 060908 - SDSS Pre-burst Observations
  81. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  82. GRB 060908: REM optical prompt observation
  83. GRB060904b optical detections (delayed report due to internet outage)
  84. GRB 060906: Swift-UVOT observations
  85. GRB 060906: FRAM observations - flash determination (airplane)
  86. GRB 060906: KAIT observations
  87. GRB 060906: Confirmation of P60 Optical Afterglow
  88. GRB 060906: observations with FRAM
  89. GRB 060906 (?): P60 Optical Afterglow Candidate
  90. GRB 060904A Milagro GeV/TeV Observations
  91. GRB060904b, optical observations
  92. GRB 060904b: SMARTS optical/IR afterglow observations
  93. GRB 060904B: RTT150 optical observations
  94. GRB060904A: Swift/UVOT optical observations
  95. GRB060904b: Optical observations with Swift/UVOT
  96. GRB 060904A: Suzaku-XIS and -HXD observation plan
  97. GRB 060904A: P60 Observations
  98. GRB 060904B: Optical observations at Crni Vrh
  99. GRB060904B: Watcher observations
  100. GRB 060904B BOOTES-IR and 1.5m OSN 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