Skip to main content
New! Browse Circulars by Event, Advanced Search, Sample Codes, Schema Release. 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"

24756 results found.

  1. IPN triangulation of GRB020708
  2. Correction to IPN error box for GRB020706
  3. IPN triangulation of GRB020706
  4. GRB 020705: Optical observations
  5. GRB 020625, optical observations
  6. GRB 020625: Optical observations
  7. GRB 020531: optical photometry of Chandra sources
  8. GRB020625 (=H2081): A Long Burst Localized by HETE
  9. The Probable Host Galaxy of GRB/XRF 020427
  10. GRB/XRF 020427, detection of an underlying system with the VLT
  11. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  12. AXP 1E2259+586 optical observations
  13. Fading Optical Source in the Field of GRB020531
  14. GRB 020531, INT+WFC deep optical upper limits
  15. SGR-like Bursts from the AXP 1E 2259+586
  16. GRB020405: polarimetric observations
  17. GRB 020531, simultaneous optical observations
  18. GRB 020531/Candidate Redshift
  19. GRB020531: Detection of Candidate Host Galaxy
  20. GRB020531: Second epoch Chandra observations
  21. GRB020604, optical observations
  22. GRB020604, BVRcIc field photometry
  23. GRB020603, BVRcIc field observations
  24. GRB020531, BVRcIc field photometry
  25. GRB020531 Optical Observations
  26. GRB020531: Observations with the Chandra X-ray Observatory
  27. GRB020531, optical observations
  28. GRB020531: optical observations
  29. GRB020531(=H2042): Optical Observations
  30. GRB020531(=H2042): Optical Observations
  31. GRB020531: Optical observations
  32. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  33. GRB020525, optical observations
  34. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  35. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  36. HST detection of the likely host galaxy of GRB 020124
  37. GRB020405 field photometry at ESO
  38. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  39. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  40. GRB020321 : Optical observations.
  41. XRF 020427
  42. GRB 020124: Optical observations
  43. IPN triangulation of GRB020418
  44. GRB020405: VLT observations of the OT environment
  45. IPN triangulation of GRB020413
  46. GRB020405: predicted break
  47. GRB 020409: No Evidence for an Optical Afterglow
  48. GRB 020331 Kyoto observation on March 31
  49. GRB020410: BeppoSAX NFI observation
  50. X-ray afterglow of GRB020321
  51. GRB020331 optical observations with RIMOTS
  52. GRB020124 optical observations with RIBOTS/RIMOTS
  53. GRB 020321: Candidate X-ray Counterparts
  54. GRB020406(?), optical observations
  55. GRB 020405: Decay index
  56. Short RXTE/ASM transient 020406; may be a GRB
  57. GRB020405, Radio Observations
  58. GRB 020405, U-band observations
  59. GRB011212: Optical Observations
  60. GRB 020331: NIR Observations
  61. GRB020331 NIR observation at KPNO (re-submission)
  62. GRB02033 NIR observation at KPNO
  63. GRB020331 field photometry
  64. GRB 020331, NIR observations
  65. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  66. GRB 020322: BeppoSAX observations of the X-ray afterglow
  67. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  68. Near-Infrared Observations of GRB020322 at TIRGO
  69. GRB 020321, Radio Observations
  70. GRB 020322: Optical Observations
  71. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  72. GRB 020321: Optical observations
  73. GRB020317 BVRI field photometry
  74. GRB011211 revised BVRI field photometry
  75. GRB020305 BVRI field photometry
  76. GRB020322 BVRI field photometry
  77. GRB 020322: Optical Sources and Improved Astrometry
  78. GRB020317: optical observations
  79. GRB020321 optical observations
  80. GRB020321: a faint BeppoSAX detection
  81. GRB 020317 : KISO Optical Observations
  82. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  83. GRB 020305: Optical Observations
  84. GRB020317, optical observations
  85. GRB 020317: Optical observations
  86. GRB 011121: Third HST Epoch
  87. GRB020305: Properties of the Candidate Optical Afterglow
  88. GRB 011121: HST Observations reveal an intermediate-time multicolor
  89. GRB011130 (XRF011130) Second Epoch Chandra Observations
  90. GRB020305: Subaru Optical Observations
  91. XRF/GRB 011030: Detection of the Probable Host Galaxy
  92. GRB 020305: Candidate optical afterglow
  93. GRB020305, optical observations
  94. IPN triangulation of GRB020305 (HETE 1939)
  95. GRB020305 (=H1939): Localization of a GRB by HETE
  96. HST Imaging of the afterglow and host of GRB 011121
  97. IPN detection and localization of Cygnus X-1 flares
  98. SGR1900+14 activity
  99. IPN Upper Limits to a GRB Associated With SN2002ap
  100. GRB020124 BVRI field photometry

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