Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

28052 results found.

  1. GRB 020625, optical observations
  2. GRB 020625: Optical observations
  3. GRB 020531: optical photometry of Chandra sources
  4. GRB020625 (=H2081): A Long Burst Localized by HETE
  5. The Probable Host Galaxy of GRB/XRF 020427
  6. GRB/XRF 020427, detection of an underlying system with the VLT
  7. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  8. AXP 1E2259+586 optical observations
  9. Fading Optical Source in the Field of GRB020531
  10. GRB 020531, INT+WFC deep optical upper limits
  11. SGR-like Bursts from the AXP 1E 2259+586
  12. GRB020405: polarimetric observations
  13. GRB 020531, simultaneous optical observations
  14. GRB 020531/Candidate Redshift
  15. GRB020531: Detection of Candidate Host Galaxy
  16. GRB020531: Second epoch Chandra observations
  17. GRB020604, optical observations
  18. GRB020604, BVRcIc field photometry
  19. GRB020603, BVRcIc field observations
  20. GRB020531, BVRcIc field photometry
  21. GRB020531 Optical Observations
  22. GRB020531: Observations with the Chandra X-ray Observatory
  23. GRB020531, optical observations
  24. GRB020531: optical observations
  25. GRB020531(=H2042): Optical Observations
  26. GRB020531(=H2042): Optical Observations
  27. GRB020531: Optical observations
  28. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  29. GRB020525, optical observations
  30. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  31. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  32. HST detection of the likely host galaxy of GRB 020124
  33. GRB020405 field photometry at ESO
  34. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  35. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  36. GRB020321 : Optical observations.
  37. XRF 020427
  38. GRB 020124: Optical observations
  39. IPN triangulation of GRB020418
  40. GRB020405: VLT observations of the OT environment
  41. IPN triangulation of GRB020413
  42. GRB020405: predicted break
  43. GRB 020409: No Evidence for an Optical Afterglow
  44. GRB 020331 Kyoto observation on March 31
  45. GRB020410: BeppoSAX NFI observation
  46. X-ray afterglow of GRB020321
  47. GRB020331 optical observations with RIMOTS
  48. GRB020124 optical observations with RIBOTS/RIMOTS
  49. GRB 020321: Candidate X-ray Counterparts
  50. GRB020406(?), optical observations
  51. GRB 020405: Decay index
  52. Short RXTE/ASM transient 020406; may be a GRB
  53. GRB020405, Radio Observations
  54. GRB 020405, U-band observations
  55. GRB011212: Optical Observations
  56. GRB 020331: NIR Observations
  57. GRB020331 NIR observation at KPNO (re-submission)
  58. GRB02033 NIR observation at KPNO
  59. GRB020331 field photometry
  60. GRB 020331, NIR observations
  61. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  62. GRB 020322: BeppoSAX observations of the X-ray afterglow
  63. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  64. Near-Infrared Observations of GRB020322 at TIRGO
  65. GRB 020321, Radio Observations
  66. GRB 020322: Optical Observations
  67. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  68. GRB 020321: Optical observations
  69. GRB020317 BVRI field photometry
  70. GRB011211 revised BVRI field photometry
  71. GRB020305 BVRI field photometry
  72. GRB020322 BVRI field photometry
  73. GRB 020322: Optical Sources and Improved Astrometry
  74. GRB020317: optical observations
  75. GRB020321 optical observations
  76. GRB020321: a faint BeppoSAX detection
  77. GRB 020317 : KISO Optical Observations
  78. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  79. GRB 020305: Optical Observations
  80. GRB020317, optical observations
  81. GRB 020317: Optical observations
  82. GRB 011121: Third HST Epoch
  83. GRB020305: Properties of the Candidate Optical Afterglow
  84. GRB 011121: HST Observations reveal an intermediate-time multicolor
  85. GRB011130 (XRF011130) Second Epoch Chandra Observations
  86. GRB020305: Subaru Optical Observations
  87. XRF/GRB 011030: Detection of the Probable Host Galaxy
  88. GRB 020305: Candidate optical afterglow
  89. GRB020305, optical observations
  90. IPN triangulation of GRB020305 (HETE 1939)
  91. GRB020305 (=H1939): Localization of a GRB by HETE
  92. HST Imaging of the afterglow and host of GRB 011121
  93. IPN detection and localization of Cygnus X-1 flares
  94. SGR1900+14 activity
  95. IPN Upper Limits to a GRB Associated With SN2002ap
  96. GRB020124 BVRI field photometry
  97. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  98. SN2002ap (SN/GRB?) Echelle spectra
  99. GRB020127 Optical Observations
  100. SN 2002ap in M74

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