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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"

24361 results found.

  1. GRB021004 Chandra Observation
  2. IPN triangulation of GRB021119 (large error box)
  3. IPN BURST POSITION
  4. IPN triangulation of GRB021125 (INTEGRAL BURST)
  5. IPN confirmation of the reactivation of SGR1900+14
  6. IPN detection of possible reactivation of SGR1900+14
  7. GRB021113, SPI ACS observation
  8. GRB 021112: Afterglow or Variable Star?
  9. GRB 021112: Variable Source in R-band search
  10. GRB021113: Kiso Observations
  11. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  12. GRB 021112: RAPTOR Observations
  13. GRB 021113: Optical Observations
  14. GRB021113 (=H2449): A Long GRB Localized by HETE
  15. GRB 021112: R-band search
  16. IPN triangulation of GRB021108 (large error box)
  17. GRB021112 (=H2448): A Long GRB Localized by HETE
  18. GRB021004: Near infrared spectroscopy
  19. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  20. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  21. SGR1900+14 activity, November 2-4, 2002
  22. GRB021104: optical observations
  23. GRB021104: possible optical afterglow
  24. Detection of activity from SGR 1900+14 with the RXTE/PCA
  25. GRB021004, late-time optical observations
  26. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  27. IPN triangulation of SGR1900+14, October 22 2002
  28. GRB 021004: optical observations
  29. GRB 020813; likely host galaxy.
  30. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  31. GRB 021016, optical observations
  32. GRB 021004: VRI observations at TNG: possible break
  33. SGR1900+14: burst on October 10 2002
  34. GRB021016(=H2397): A Long GRB Localized by HETE
  35. GRB021004: High-resolution optical spectroscopy
  36. IPN triangulation of GRB021013 (annulus)
  37. GRB021004: Optical Observations
  38. GRB021004 Chandra HETG Observations
  39. GRB 021004: WC wind?
  40. IPN triangulation of GRB021007 (annulus)
  41. XRF 020903 spectrum
  42. GRB021004: optical observations and predicted break time
  43. GRB021004: BVRc photometry
  44. GRB 021004: Optical Decay
  45. GRB 021004 continued IR fading
  46. HETE fluences for GRB021004
  47. GRB021004: not fading anymore?
  48. GRB021004: Update Bisei photometric data
  49. GRB021004: continued fading
  50. GRB 021004, optical observations
  51. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  52. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  53. GRB021004: Optical Afterglow
  54. GRB020924 (ecliptic latitude-only localization)
  55. IPN annulus for GRB020914B
  56. IPN triangulation of GRB020914
  57. IPN GCN Circulars now to be issued without restriction
  58. GRB020322 : HST/STIS observations
  59. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  60. INTEGRAL GRBs added to GCN
  61. GRB020812: optical observation
  62. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  63. SGR1900+14 burst localized by HETE
  64. GRB020813: High-resolution optical spectroscopy
  65. GRB020819: optical observations at Bisei
  66. Second epoch K band imaging of GRB 020819
  67. Confirming no variability for GRB02081
  68. GRB 020812: early time optical observation at Ouda Station
  69. GRB020813: VRI Decay Slopes
  70. K band observation of GRB 020819
  71. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  72. GRB020813: Fading X-ray Afterglow Observed with Chandra
  73. GRB 020813: addendum to GCN 1498
  74. GRB020813: optical observations at Bisei
  75. GRB020813: V-band decay slope
  76. GRB020813 IRAM millimeter observations
  77. GRB020812: optical observations
  78. GRB020813: High-Resolution Optical Observations
  79. GRB020813(=H2262): Revised Localization with HETE SXC
  80. GRB 020812: optical observation at Bisei
  81. GRB020813: Early Time Magnitude
  82. GRB 020812 : optical afterglow candidate
  83. IPN triangulation of GRB020813
  84. Early Time Limits for GRB020813
  85. GRB 020813 Afterglow Observations; Possible break
  86. GRB020813: Fading of Candidate OT
  87. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  88. GRB020813: Candidate Optical Afterglow
  89. GRB 020812 optical observation
  90. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  91. GRB 020715, optical observations
  92. GRB 020714, optical observations
  93. HST Imaging of the Host of GRB 011121
  94. GRB020331: Late-time Optical Light Curve (re-submission)
  95. GRB020331: Late-time Optical Light Curve
  96. GRB 020405: HST observations reveal red bump
  97. IPN triangulation of GRB020714
  98. GRB 020410: Discovery of Probable OT by HST
  99. GRB 020625, optical observations
  100. GRB020625 (=H2081): A Long Burst Localized by HETE

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