Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

35440 results found.

  1. GRB/XRF 020427, detection of an underlying system with the VLT
  2. GRB 020531, INT+WFC deep optical upper limits
  3. GRB020405: polarimetric observations
  4. GRB 020531, simultaneous optical observations
  5. GRB 020604, optical observations
  6. GRB 020531/Candidate Redshift
  7. GRB020531: Second epoch Chandra observations
  8. GRB020604, optical observations
  9. GRB020604, BVRcIc field photometry
  10. GRB020603, BVRcIc field observations
  11. GRB020531, BVRcIc field photometry
  12. GRB020531 Optical observations with TAROT
  13. GRB020531 Optical observations with TAROT
  14. GRB 020418, optical/near-IR observations
  15. GRB 020531, Radio Observations
  16. IPN triangulation of GRB020604
  17. GRB020531: Observations with the Chandra X-ray Observatory
  18. GRB 020603: Optical Observations
  19. GRB 020603, R-band observation
  20. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  21. GRB 020603: Optical observations
  22. IPN triangulation of GRB020603 (possible short/hard GRB)
  23. GRB 020531 optical observations with TAROT
  24. Refined IPN error box for GRB020531
  25. GRB020531, optical observations
  26. GRB020531(=H2042): Optical Observations
  27. IPN triangulation of the short, hard GRB020531 (=H2042)
  28. GRB020531(=H2042): Optical Observations
  29. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  30. GRB 020525: Optical Observations
  31. GRB020525, optical observations
  32. IPN detection of possible bursts from SGR1806-20
  33. IPN triangulation of GRB020525
  34. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  35. IPN triangulation of a burst from SGR1806-20
  36. GRB/XRF 020427, Radio Observations
  37. HST detection of the likely host galaxy of GRB 020124
  38. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  39. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  40. GRB020321 : Optical observations.
  41. GRB020427 BeppoSAX NFI Observation
  42. XRF 020427
  43. GRB020331: Third Epoch and Revised Second Epoch Optical
  44. The end of BSAX GRB activities
  45. GRB 020410, Radio Observations
  46. GRB 020418: Optical observations
  47. GRB 020124: Optical observations
  48. GRB 020418: Optical observations
  49. IPN triangulation of GRB020418
  50. GRB020405: VLT observations of the OT environment
  51. GRB020410: BeppoSAX NFI observations refined analysis
  52. GRB 020409: Optical Observations
  53. Mars Odyssey joins the IPN
  54. IPN triangulation of GRB020413
  55. GRB 020409, 2-nd epoch optical observations at Terskol.
  56. GRB 020409: Optical observations
  57. GRB 020409, No Optical Detection to R = 22
  58. GRB 020409: No Evidence for an Optical Afterglow
  59. GRB 020409, 2nd epoch optical observations
  60. GRB 020331 Kyoto observation on March 31
  61. GRB 020409
  62. GRB 020409 SARA Observations
  63. GRB "020411"
  64. GRB 020409, No Optical Detection to R = 20
  65. GRB020410: BeppoSAX NFI observation
  66. GRB 020409: Optical observations
  67. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  68. GRB 020410, optical observations
  69. BeppoSAX ALERT: possible GRB020411
  70. GRB 020409, optical observations
  71. GRB 020409: Optical Observations
  72. GRB020406(?), optical observations
  73. GRB020410, optical observations
  74. BeppoSAX ALERT: possible GRB020410
  75. X-ray afterglow of GRB020321
  76. BeppoSAX GRB : GRB020409
  77. GRB020405: VLT optical observations and V band decay slope
  78. GRB020331 optical observations with RIMOTS
  79. GRB020124 optical observations with RIBOTS/RIMOTS
  80. GRB 020321: Candidate X-ray Counterparts
  81. ASM GRB candidate 020406 refined error box
  82. GRB 020405: Moderate-resolution spectroscopy
  83. GRB020406(?), optical observations
  84. GRB020405: VLT optical observations
  85. Revised Photometry of the Optical Afterglow of GRB 020405
  86. GRB020405: OT observations
  87. GRB 020331: Candidate Optical Afterglow
  88. GRB 020405: Decay index
  89. Short RXTE/ASM transient 020406; may be a GRB
  90. GRB020405, Radio Observations
  91. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  92. GRB 020405, U-band observations
  93. GRB 020405: Optical afterglow candidate
  94. IPN localization of GRB020405
  95. GRB011212: Optical Observations
  96. GRB 020331: NIR Observations
  97. GRB 020331: NIR Observations
  98. GRB020331 NIR observation at KPNO (re-submission)
  99. GRB02033 NIR observation at KPNO
  100. GRB020331 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