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"

37568 results found.

  1. Spectropolarimetry of GRB 020813
  2. GRB 020813 Afterglow Observations; Possible break
  3. GRB 020813: Absorption redshift
  4. GRB 020813 multiband optical observations
  5. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  6. GRB 020812 optical observation
  7. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  8. GRB 020715, optical observations
  9. GRB 020714, optical observations
  10. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  11. HST Imaging of the Host of GRB 011121
  12. GRB020801, optical afterglow candidate
  13. Further refinement to IPN error box for GRB020531
  14. GRB020331: Late-time Optical Light Curve (re-submission)
  15. GRB020331: Late-time Optical Light Curve
  16. GRB 020405: HST observations reveal red bump
  17. IPN triangulation of GRB020714
  18. IPN triangulation of GRB020715 (=GRB150702)
  19. IPN triangulation of GRB020714
  20. IPN triangulation of GRB150702
  21. GRB 020410: Discovery of Probable OT by HST
  22. GRB 020124, HST observations of the fading afterglow
  23. IPN triangulation of GRB020708
  24. IPN triangulation of GRB020708
  25. IPN error box for GRB020706
  26. IPN triangulation of GRB020706
  27. GRB 020705: Optical observations
  28. GRB 020625, optical observations
  29. GRB 020625: Optical observations
  30. GRB 020531: optical photometry of Chandra sources
  31. GRB020625 (=H2081): A Long Burst Localized by HETE
  32. The Probable Host Galaxy of GRB/XRF 020427
  33. GRB/XRF 020427, detection of an underlying system with the VLT
  34. GRB 020531, INT+WFC deep optical upper limits
  35. GRB020405: polarimetric observations
  36. GRB 020531, simultaneous optical observations
  37. GRB 020604, optical observations
  38. GRB 020531/Candidate Redshift
  39. GRB020531: Second epoch Chandra observations
  40. GRB020604, optical observations
  41. GRB020604, BVRcIc field photometry
  42. GRB020603, BVRcIc field observations
  43. GRB020531, BVRcIc field photometry
  44. GRB020531 Optical observations with TAROT
  45. GRB020531 Optical observations with TAROT
  46. GRB 020418, optical/near-IR observations
  47. GRB 020531, Radio Observations
  48. IPN triangulation of GRB020604
  49. GRB020531: Observations with the Chandra X-ray Observatory
  50. GRB 020603: Optical Observations
  51. GRB 020603, R-band observation
  52. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  53. GRB 020603: Optical observations
  54. IPN triangulation of GRB020603 (possible short/hard GRB)
  55. GRB 020531 optical observations with TAROT
  56. Refined IPN error box for GRB020531
  57. GRB020531, optical observations
  58. GRB020531(=H2042): Optical Observations
  59. IPN triangulation of the short, hard GRB020531 (=H2042)
  60. GRB020531(=H2042): Optical Observations
  61. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  62. GRB 020525: Optical Observations
  63. GRB020525, optical observations
  64. IPN detection of possible bursts from SGR1806-20
  65. IPN triangulation of GRB020525
  66. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  67. IPN triangulation of a burst from SGR1806-20
  68. GRB/XRF 020427, Radio Observations
  69. HST detection of the likely host galaxy of GRB 020124
  70. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  71. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  72. GRB020321 : Optical observations.
  73. GRB020427 BeppoSAX NFI Observation
  74. XRF 020427
  75. GRB020331: Third Epoch and Revised Second Epoch Optical
  76. The end of BSAX GRB activities
  77. GRB 020410, Radio Observations
  78. GRB 020418: Optical observations
  79. GRB 020124: Optical observations
  80. GRB 020418: Optical observations
  81. IPN triangulation of GRB020418
  82. GRB020405: VLT observations of the OT environment
  83. GRB020410: BeppoSAX NFI observations refined analysis
  84. GRB 020409: Optical Observations
  85. Mars Odyssey joins the IPN
  86. IPN triangulation of GRB020413
  87. GRB 020409, 2-nd epoch optical observations at Terskol.
  88. GRB 020409: Optical observations
  89. GRB 020409, No Optical Detection to R = 22
  90. GRB 020409: No Evidence for an Optical Afterglow
  91. GRB 020409, 2nd epoch optical observations
  92. GRB 020331 Kyoto observation on March 31
  93. GRB 020409
  94. GRB 020409 SARA Observations
  95. GRB "020411"
  96. GRB 020409, No Optical Detection to R = 20
  97. GRB020410: BeppoSAX NFI observation
  98. GRB 020409: Optical observations
  99. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  100. GRB 020410, 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