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"

32716 results found.

  1. GRB 071028: SARA observations of variable source
  2. Swift UVOT upper limits to GRB071028
  3. GRB 071028: Swift-XRT Team refined analysis
  4. GRB 071028, Swift-BAT refined analysis
  5. GRB 071025: Kuiper Telescope Optical Observations
  6. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  7. GRB 071018: Revised BAT position
  8. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  9. GRB071021: MARGE Optical Limits
  10. GRB071020, optical upper limit
  11. GRB 071025: SARA VRI upper limits
  12. GRB 071025 Milagro GeV/TeV Observations
  13. GRB071025: Optical Pre-imaging from Palomar
  14. Swift UVOT upper limits
  15. GRB071025: Xinglong TNT I-band upper limit
  16. GRB 071025: Swift-XRT Team refined analysis
  17. GRB 071025, Swift-BAT refined analysis
  18. GRB 071025: Early Super-LOTIS Observations
  19. GRB 071025: R/I-band update
  20. GRB071021 : CFHT Ks-band observation
  21. GRB 071025: ROTSE-III Refined Analysis
  22. GRB 071025: Swift XRT refined position
  23. GRB 071025a: PAIRITEL observations
  24. GRB071025: REM NIR afterglow
  25. GRB 071025: ROTSE-III Detection of Optical Counterpart
  26. GRB 071021: R-band detection and analysis
  27. GRB 071020: BTA spectroscopy
  28. GRB071021: Optical+NIR observations
  29. Possible radio detection of GRB 071021 with the VLA
  30. Optical observations of GRB 071020
  31. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  32. GRB 071020: SARA observations
  33. Radio detection of GRB 071020 with the VLA
  34. GRB071010b: optical observation
  35. GRB 071021: Subaru NIR observation
  36. GRB 071021: Magellan i-band observation
  37. GRB 071021: Z-band detection
  38. GRB 071020: Fading slowly?
  39. GRB 071010B: Fading quickly
  40. GRB 071021: optical and NIR observations
  41. GRB 071021: possible high-z burst
  42. GRB 071021, Swift-BAT refined analysis
  43. GRB071018: 2nd epoch obsevations of Xinglong TNT
  44. GRB 071021: retraction of Faulkes Telescope South candidate
  45. GRB 071021: Swift-XRT Team refined analysis
  46. GRB 071021: Xinglong TNT optical Upper Limit
  47. GRB 071021 : Lulin R-band limit
  48. Konus-Wind observation of GRB 071020
  49. GRB 071021: Faulkes Telescope South optical candidate
  50. GRB 071010B: Independent Confirmation of Break
  51. GRB071020A: Xinglong TNT Optical afterglow observations
  52. GRB 071020: Swift-XRT refined analysis
  53. GRB 071020, Swift-BAT refined analysis
  54. GRB 071020A: IR Imaging with PAIRITEL
  55. GRB 071020: VLT spectroscopy
  56. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  57. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  58. Swift autonomous slewing re-enabled
  59. GRB071010b: optical observations
  60. GRB 071018: SARA observations
  61. GRB 071018: Swift-XRT observation
  62. GRB 071017 - Swift XRT observations
  63. VLA radio observation of GRB 071018
  64. GRB071018: Correction to the GCN 6936
  65. GRB071018: Correction to the GCN 6936
  66. GRB071018: Correction to the GCN 6936
  67. GRB071018: Correction to the title of the GCN 6936
  68. GRB 071018: Possible OT from Xinglong TNT observation
  69. GRB 071010B: Light Curve Break Confirmed
  70. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  71. GRB 071018, Swift-BAT refined analysis
  72. GRB 071010B: Suzaku WAM observation of the prompt emission
  73. GRB 071013: 3rd TLS Epoch - constraints on variability
  74. GRB 071013: TNT optical data refined analysis
  75. GRB 071010B: Keck/DEIMOS emission-line redshift
  76. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  77. GRB071013: optical observations
  78. GRB 071010B: Optical observations of EST
  79. GRB 071010B: TLS 3rd Epoch - finally a break??
  80. GRB 071011: MITSuME Optical Observations
  81. GRB 070920A: deep optical observations at the NOT
  82. GRB 071010B: Photometry after 1.6 days
  83. GRB 071010B: Keck/LRIS Photometry
  84. GRB 071010B: TLS 2nd Epoch, refined analysis
  85. GRB 071013: TLS Upper Limit
  86. Correction to GCN circular no. # 6915 for GRB 071010B
  87. VLA detection of radio afterglow of GRB 071010B
  88. VLA non-detection of GRB 071011
  89. GRB 071013: optical observations at NOT
  90. GRB 071013, Swift-BAT refined analysis
  91. GRB071013: optical limit
  92. GRB 20071013: Xinglong TNT optical Upper Limit
  93. GRB 071011: Optical Limit after 13.95hrs
  94. GRB 071011: Xinglong TNT Optical afterglow observations
  95. GRB 071010B correction to GCN 6892 optical observations
  96. GRB 071011: Swift-XRT refined analysis
  97. VLA non-detection of GRB 071010A
  98. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  99. GRB 071011, Optical afterglow
  100. GRB 071011: Confirmation of P60 optical 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