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"

43917 results found.

  1. GRB0711101: Two new source from Xinglong TNT observation
  2. GRB 071101: TAROT Calern observatory optical observations
  3. GRB 071101: Swift XRT position
  4. GRB071101 LOAO B,V,R,I observation
  5. GRB 071101: a nearby galaxy
  6. GRB 071101: Swift detection of a burst
  7. GRB 071031, Swift-BAT refined analysis
  8. GRB 071031: Swift/UVOT detection of afterglow
  9. GRB 071031: Swift-XRT Team refined analysis
  10. GRB 071020: MITSuME Akeno optical observations
  11. GRB 071031: REM NIR and Optical observation
  12. GRB 071031, SMARTS afterglow observations
  13. GRB 071031: VLT high-resolution spectroscopy
  14. GRB071031: Rapid PROMPT Detections
  15. GRB 071031: GROND detection in all bands
  16. GRB 071031: Swift detection of a burst with an optical counterpart
  17. GRB 071028B Swift-BAT detection of a burst
  18. GRB071025: Optical+NIR observations
  19. GRB 071028: SARA observations of variable source
  20. Swift UVOT upper limits to GRB071028
  21. GRB071028: Xinglong EST V-band upper limit
  22. GRB 071028: Swift-XRT Team refined analysis
  23. GRB 071028, Swift-BAT refined analysis
  24. GRB 071028: Swift detection of a burst
  25. GRB 071025: Kuiper Telescope Optical Observations
  26. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  27. GRB 071018: Revised BAT position
  28. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  29. GRB071021: MARGE Optical Limits
  30. GRB 071025 Milagro GeV/TeV Observations
  31. GRB 071025: SQIID JHK photometry
  32. GRB 071025A: Complex Early-Time IR Behavior, Simultaneous with Gamma- and X-rays
  33. GRB071025: Optical Pre-imaging from Palomar
  34. Swift UVOT upper limits
  35. GRB071025: Xinglong TNT I-band upper limit
  36. GRB 071025: Swift-XRT Team refined analysis
  37. GRB 060602A: host redshift
  38. GRB 071025, Swift-BAT refined analysis
  39. GRB 071025: Early Super-LOTIS Observations
  40. GRB 071025: R/I-band update
  41. GRB071021 : CFHT Ks-band observation
  42. GRB 071025: ROTSE-III Refined Analysis
  43. GRB 071025: I-detection, R-dropout?
  44. GRB 071025: Swift XRT refined position
  45. GRB 071025a: PAIRITEL observations
  46. GRB071025: REM NIR afterglow
  47. GRB 071025: ROTSE-III Detection of Optical Counterpart
  48. GRB 071025: Swift detection of a burst
  49. GRB 071021: R-band detection and analysis
  50. GRB 071020: BTA spectroscopy
  51. GRB071021: Optical+NIR observations
  52. Possible radio detection of GRB 071021 with the VLA
  53. Optical observations of GRB 071020
  54. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  55. Radio detection of GRB 071020 with the VLA
  56. GRB071010b: optical observation
  57. GRB 071021: Magellan i-band observation
  58. GRB 071021: Magellan R-band observation
  59. GRB 071021: Z-band detection
  60. GRB 071021: correction to GCNC 6968
  61. GRB 071020: Fading slowly?
  62. GRB 071010B: Fading quickly
  63. GRB 071021: optical and NIR observations
  64. GRB 071021, Swift-BAT refined analysis
  65. GRB071018: 2nd epoch obsevations of Xinglong TNT
  66. GRB 071021: retraction of Faulkes Telescope South candidate
  67. GRB 071021: Swift-XRT Team refined analysis
  68. GRB 071021: Xinglong TNT optical Upper Limit
  69. Konus-Wind observation of GRB 071020
  70. GRB 071021: Faulkes Telescope South optical candidate
  71. GRB 071021: Swift detection of a burst
  72. GRB071020A: Xinglong TNT Optical afterglow observations
  73. GRB 071020: Swift-XRT refined analysis
  74. GRB 071020, Swift-BAT refined analysis
  75. GRB 071020A: IR Imaging with PAIRITEL
  76. GRB 071020: VLT spectroscopy
  77. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  78. GRB071020 - SDSS Pre-burst Observations
  79. GRB 071020: Swift detection of a bright burst
  80. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  81. GRB 071018: Mercator Telescope optical observations
  82. Swift autonomous slewing re-enabled
  83. GRB071010b: optical observations
  84. GRB 071018: SARA observations
  85. GRB 071018: Swift-XRT observation
  86. GRB 071017 - Swift XRT observations
  87. VLA radio observation of GRB 071018
  88. GRB071018: Correction to the title of the GCN 6936
  89. GRB 071018: Possible OT from Xinglong TNT observation
  90. GRB 071010B: Light Curve Break Confirmed
  91. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  92. GRB 071018, Swift-BAT refined analysis
  93. GRB 071018?: Swift detection of a possible burst
  94. GRB 071010B: Suzaku WAM observation of the prompt emission
  95. GRB 071013: 3rd TLS Epoch - constraints on variability
  96. GRB 071010B: Keck/DEIMOS emission-line redshift
  97. GRB 071017: a SHORT GRB detected by INTEGRAL
  98. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  99. GRB071013: optical observations
  100. GRB 071010B: Optical observations of EST

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