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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"

32722 results found.

  1. IPN triangulation of GRB030922A (large error box)
  2. IPN triangulation of GRB030921 (large error box)
  3. GRB030913: Subaru Optical Observations
  4. GRB 030913: ROTSE-3c Optical Observations
  5. GRB030913: OT's limit by MASTER
  6. GRB030913, candidate afterglow observations
  7. GRB030913: AAVSO optical observations
  8. GRB030913 (=H2849): Confirmation of the Flight Localization
  9. GRB030913 (=H2849): TAROT Observations
  10. Magellan Observations of GRB030725 (=H2779)
  11. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  12. IBAS detection of bursts from SGR 1806-20
  13. Radio Observations of SGR1806-20
  14. GRB 030824: Candidate Follow-Up
  15. XRF030824: Second-epoch Palomar observations
  16. XRF030824: optical observations
  17. XRF030824: Palomar observations
  18. GRB030823: optical observation at Tokyo Tech
  19. RAPTOR observations of GRB030823
  20. IPN triangulation of GRB030821 (=H2814; refined error box)
  21. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  22. Summary of recent IPN and HETE detections of SGR bursts
  23. Clarification of GCN 2354 on SGR1806-20
  24. IPN detection of continued activity from SGR1806-20
  25. 030813 SGR event (Konus-Wind observation)
  26. SGR 1808-20 (=H2802): A Possible new SGR
  27. GRB 021206 Optical Observations
  28. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  29. IPN/HETE summary of recent bursts from SGR1806-20
  30. XRF 030723: Detection of a rebrightening in the optical afterglow
  31. GRB030725: Optical observations
  32. XRF030723, BVRcIc field photometry update
  33. GRB021206 optical counterpart upper limit
  34. XRF030723: Re-analysis of ROTSE-III early images
  35. IPN triangulation of GRB030725 (=H2779; small error box)
  36. XRF030723 (=H2777): Second Epoch Magellan Observations
  37. GRB 030725: optical observations.
  38. GRB030725, optical transient observations
  39. XRF030723 Radio Observations
  40. XRF 030723: confirmation of fading optical counterpart
  41. XRF030723(=H2777): Chandra Observations
  42. XRF 030723: VLT spectra
  43. Magellan Observations of XRF030723 (=H2777)
  44. GRB030723: Upper limits from historical observations
  45. GRB030725, possible optical transient
  46. XRF030723: Palomar observations and proposed counterpart
  47. GRB030725 (=H2779): A Bright GRB Localized by HETE
  48. XRF030723: optical observations
  49. XRF030723 (= H2777): Chandra Observations Scheduled
  50. XRF030723, BVRcIc field photometry
  51. XRF030723, optical observations
  52. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  53. Konus-Wind detection of the bursts from SGR1806-20 region
  54. SGR 1806-20, submm observations
  55. RXTE PCA Observations of SGR1806-20 Region
  56. GRB030329: Subaru Optical Spectroscopy
  57. Triangulation of GRB030715 (single large error box)
  58. Triangulation of GRB030714 (single large error box)
  59. GRB030329: RTT150 optical observations
  60. GRBlog: Compilation of all GCN Circ. data
  61. GRB030706 triangulation (single large error box)
  62. GRB030329, optical observation in May
  63. IPN triangulation of GRB030626 (single large error box)
  64. GRB030418: R optical observations
  65. Final IPN error ellipse for GRB021206 (the polarized GRB)
  66. GRB 021206, Radio afterglow candidate
  67. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  68. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  69. GRB 030528: Optical Observations
  70. GRB 030528: tentative NIR counterpart
  71. GRB 030528, radio observations
  72. GRB030329, further radio observations at GMRT
  73. GRB030528, BVRI field photometry
  74. GRB030329, SPM optical observations
  75. GRB030528: Chandra TOO Planned
  76. GRB 030519B: optical observations.
  77. GRB 030329: optical observations
  78. GRB 030329/SN 2003dh: Jitter Episode
  79. GRB 030528, Teramo optical observation
  80. GRB 030528 Bisei optical observation
  81. GRB030528 (H2724): A long GRB localized by HETE
  82. GRB 030329: Correction to GCN 2254
  83. GRB 030329: Optical Observations
  84. GRB 030416: Optical Observations
  85. GRB030329, Optical observations
  86. GRB 030329/SN 2003dh: Possible increase in brightness
  87. GRB 030329: HST ACS Observations of the Host
  88. GRB 030329 Optical Observations
  89. GRB030329: XMM-Newton observation
  90. GRB030324: Further Observations of the Candidate Optical Afterglow
  91. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  92. IPN triangulation of GRB030519B=H2716 (small error box)
  93. GRB 030418: Second Epoch Optical Observations with Magellan
  94. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  95. HETE GRB030329, correction to Rc Observations in Loiano
  96. GRB 030329: Optical limit (contemporaneous imaging)
  97. GRB 030501: final TAROT limits
  98. IPN triangulation of GRB030509 (small errror box)
  99. IPN triangulation of GRB030509 - correction
  100. GRB030329: RTT150 optical observations

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