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"

20510 results found.

  1. Swift/UVOT observations of GRB071118
  2. Swift XRT follow-up observations of GRB071008
  3. Swift/UVOT upper limits for GRB 071117
  4. GRB071118: Swift XRT refined analysis
  5. GRB 071117: Gemini Optical Afterglow Discovery
  6. GRB 071118, Swift-BAT refined analysis
  7. GRB 071117: TAROT La Silla observatory optical observations
  8. GRB 071112B: Gemini Image Differencing
  9. GRB 071118: Swift detection of a burst
  10. GRB 071117: Gemini Observations
  11. VLT FORS2 observations of short hard GRB071112B
  12. Swift detection of MXB 0656-072
  13. GRB 071112C: Optical and NIR data observed with KANATA
  14. GRB 071112C: optical observation
  15. GRB 071112C: emission lines and refined VLT redshift
  16. GRB 071112C MITSuME Akeno early optical observation
  17. GRB 071112C: SARA upper limit
  18. GRB 071112C : Second Epoch Lulin R-band observations
  19. GRB071112C MITSuME Okayama Optical Observation
  20. GRB 071112C: Swift-BAT refined analysis
  21. GRB 071112C: Swift XRT refined analysis
  22. Swift UVOT upper limits of GRB071112B
  23. GRB 071112B: Gemini Optical Imaging
  24. GRB 071112B: Swift-XRT preliminary analysis
  25. GRB 071112C : Lulin R-band observation
  26. GRB 071112C: TAROT Calern observatory optical observations
  27. Swift XRT follow-up observations of GRB071028B
  28. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  29. GRB 071112C: Optical and NIR afterglows observed with KANATA
  30. GRB 071112C: Swift detection of a burst with an optical counterpart
  31. GRB 071112: Swift detection of a possible burst
  32. Swift/UVOT initial analysis of GRB071109
  33. GRB 071109: further Swift-XRT analysis
  34. GRB 071109: TAROT Calern observatory optical observations
  35. GRB 071109: Swift-XRT possible X-ray counterpart
  36. GRB 071104: Swift-XRT Team Refined Analysis
  37. GRB 071104: Possible Swift UVOT Afterglow Candidate
  38. GRB 071104: Swift-XRT position
  39. Swift XRT and UVOT observations of GRB071028B
  40. GRB 071101: Swift-XRT Team refined analysis
  41. GRB071101: Optical and NIR upper limits by KANATA
  42. GRB0711101: Two new source from Xinglong TNT observation
  43. GRB 071101: TAROT Calern observatory optical observations
  44. GRB071101 LOAO B,V,R,I observation
  45. GRB 071031: Swift-XRT Team refined analysis
  46. GRB 071020: MITSuME Akeno optical observations
  47. GRB 071031: REM NIR and Optical observation
  48. GRB 071031: Swift detection of a burst with an optical counterpart
  49. GRB 071028B Swift-BAT detection of a burst
  50. GRB 071028: SARA observations of variable source
  51. Swift UVOT upper limits to GRB071028
  52. GRB071028: Xinglong EST V-band upper limit
  53. GRB 071028: Swift-XRT Team refined analysis
  54. GRB 071028: Swift detection of a burst
  55. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  56. GRB071021: MARGE Optical Limits
  57. GRB071020, optical upper limit
  58. GRB 071025: SARA VRI upper limits
  59. GRB 071025: SQIID JHK photometry
  60. Swift UVOT upper limits
  61. GRB071025: Xinglong TNT I-band upper limit
  62. GRB 071025: Swift-XRT Team refined analysis
  63. GRB071021 : CFHT Ks-band observation
  64. GRB 071025a: PAIRITEL observations
  65. GRB071025: REM NIR afterglow
  66. GRB 071025: Swift detection of a burst
  67. GRB 071021: R-band detection and analysis
  68. GRB 071020: BTA spectroscopy
  69. Possible radio detection of GRB 071021 with the VLA
  70. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  71. GRB 071020: SARA observations
  72. Radio detection of GRB 071020 with the VLA
  73. GRB071021: MITSuME Okayama Optical Upper Limits
  74. GRB 071021: Z-band detection
  75. GRB071018: 2nd epoch obsevations of Xinglong TNT
  76. GRB 071021: Xinglong TNT optical Upper Limit
  77. GRB 071021 : Lulin R-band limit
  78. GRB 071021: Swift detection of a burst
  79. GRB071020A: Xinglong TNT Optical afterglow observations
  80. GRB 071020A: IR Imaging with PAIRITEL
  81. GRB071020 - SDSS Pre-burst Observations
  82. GRB 071020: Swift detection of a bright burst
  83. GRB 071018: Mercator Telescope optical observations
  84. GRB 071018: SARA observations
  85. GRB 071018: Swift-XRT observation
  86. GRB 071017 - Swift XRT observations
  87. GRB 071018: Possible OT from Xinglong TNT observation
  88. GRB 071010B: Light Curve Break Confirmed
  89. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  90. GRB 071018, Swift-BAT refined analysis
  91. GRB 071013: 3rd TLS Epoch - constraints on variability
  92. GRB 071013: TNT optical data refined analysis
  93. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  94. GRB 071011: MITSuME Optical Observations
  95. GRB 070920A: deep optical observations at the NOT
  96. GRB 071010B: Keck/LRIS Photometry
  97. GRB 071013: TLS Upper Limit
  98. VLA non-detection of GRB 071011
  99. GRB 071013: Optical observations
  100. GRB 071013: optical observations at NOT

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