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"

22076 results found.

  1. GRB 020410: Discovery of Probable OT by HST
  2. GRB 020124, HST observations of the fading afterglow
  3. GRB 020705: Optical observations
  4. GRB 020625, optical observations
  5. GRB 020625: Optical observations
  6. GRB 020531: optical photometry of Chandra sources
  7. HETE #2081: Optical observations
  8. The Probable Host Galaxy of GRB/XRF 020427
  9. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  10. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  11. AXP 1E2259+586 optical observations
  12. Fading Optical Source in the Field of GRB020531
  13. GRB 020531, INT+WFC deep optical upper limits
  14. SGR-like Bursts from the AXP 1E 2259+586
  15. GRB020405: polarimetric observations
  16. GRB 020531, simultaneous optical observations
  17. GRB 020604, optical observations
  18. GRB 020531/Candidate Redshift
  19. GRB020531: Second epoch Chandra observations
  20. GRB020604, optical observations
  21. GRB020603, BVRcIc field observations
  22. GRB020531 Optical observations with TAROT
  23. GRB020531 Optical observations with TAROT
  24. GRB 020418, optical/near-IR observations
  25. GRB 020531, Radio Observations
  26. GRB020531 Optical Observations
  27. GRB020531: Observations with the Chandra X-ray Observatory
  28. GRB 020603: Optical Observations
  29. GRB020531: Upper Limit for Detection of Two TAROT Sources
  30. GRB 020603: Optical observations
  31. GRB 020531 optical observations with TAROT
  32. GRB020531, optical observations
  33. GRB020531: optical observations
  34. GRB020531(=H2042): Optical Observations
  35. GRB020531(=H2042): Optical Observations
  36. GRB020531: Optical observations
  37. GRB 020525: Optical Observations
  38. GRB020525, optical observations
  39. XRF 020427: Sudden Ionospheric Disturbance (SID)
  40. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  41. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  42. GRB/XRF 020427, Radio Observations
  43. HST detection of the likely host galaxy of GRB 020124
  44. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  45. GRB020321 : Optical observations.
  46. GRB020427 BeppoSAX NFI Observation
  47. XRF 020427
  48. GRB020331: Third Epoch and Revised Second Epoch Optical
  49. GRB 020410, Radio Observations
  50. GRB 020418: Optical observations
  51. GRB 020124: Optical observations
  52. GRB 020418: Optical observations
  53. GRB020405: VLT observations of the OT environment
  54. GRB020410: BeppoSAX NFI observations refined analysis
  55. GRB 020409: Optical Observations
  56. Mars Odyssey joins the IPN
  57. GRB 020409, 2-nd epoch optical observations at Terskol.
  58. GRB020405: predicted break
  59. GRB 020409: Optical observations
  60. GRB 020409, 2nd epoch optical observations
  61. GRB 020409
  62. GRB 020409 SARA Observations
  63. GRB "020411"
  64. GRB 020409: Optical observations
  65. GRB 020410, optical observations
  66. GRB 020409, optical observations
  67. GRB 020409: Optical Observations
  68. GRB020406(?), optical observations
  69. GRB020410, optical observations
  70. GRB020331: Confirmation of Afterglow Candidate with Magellan
  71. GRB020405: VLT optical observations and V band decay slope
  72. GRB020331 optical observations with RIMOTS
  73. GRB020124 optical observations with RIBOTS/RIMOTS
  74. GRB 020405: Moderate-resolution spectroscopy
  75. GRB020331: Optical Observations of Afterglow Candidate
  76. GRB020406(?), optical observations
  77. GRB020405: VLT optical observations
  78. GRB020405: OT observations
  79. GRB 020331: Candidate Optical Afterglow
  80. GRB 020405: Decay index
  81. Short RXTE/ASM transient 020406; may be a GRB
  82. GRB020405, Radio Observations
  83. V band observations of GRB020405
  84. GRB 020405, U-band observations
  85. GRB011212: Optical Observations
  86. GRB 020331: NIR Observations
  87. GRB 020331: NIR Observations
  88. GRB020331 NIR observation at KPNO (re-submission)
  89. GRB02033 NIR observation at KPNO
  90. GRB 020331 Optical Observations
  91. GRB 020331, NIR observations
  92. GRB 020331: Optical observations
  93. GRB 020321: Infrared observations
  94. GRB 020322: BeppoSAX observations of the X-ray afterglow
  95. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  96. GRB 020322, Radio observations
  97. Near-Infrared Observations of GRB020322 at TIRGO
  98. GRB 020321, Radio Observations
  99. GRB 020322: Optical Observations
  100. GRB 020321: Optical observations

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