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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"

28199 results found.

  1. GRB 040825: Optical observations
  2. XRF040812: possible afterglow second Chandra observation
  3. GRB 040812: Second epoch CXO Observations
  4. XRF040812: possible afterglow
  5. CXO observation of GRB 040812
  6. GRB 040812: radio observations
  7. GRB 040810: Optical observations of a limited region
  8. GRB040624: optical monitoring at TNG
  9. XRF040701: Second-Epoch Chandra Observations
  10. XRF040701: VLA Observations
  11. XRF040701: First-Epoch Chandra Observations
  12. GRB 030329: Rebrightening of hyperluminal ejecta.
  13. GRB040511: Retraction of redshift identification
  14. GRB 040511, very fast decay?
  15. GRB 030324: Detection and Color of Host Galaxy
  16. GRB040511: Redshift identifcation
  17. GRB 040511: Optical limit
  18. GRB040511: Candidate optical/NIR afterglow
  19. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  20. GRB040422, BVRcIc field calibration
  21. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  22. GRB 040403: Optical Observations
  23. GRB 040323, a dark GRB ?
  24. GRB040223: Deep NIR NTT data re-analysis
  25. GRB 040223: XMM-Newton results
  26. GRB040223, improved XMM position
  27. GRB 031203, possible supernova
  28. MASTER: RXTE GRB040308 optical observation
  29. INTEGRAL detection of activity from SGR1806-20
  30. RXTE GRB040229 optical observation: no candidate
  31. GRB 040228 Optical observations
  32. GRB 040223 : Optical observation (non-detection)
  33. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  34. GRB031203: Chandra Observations
  35. GRB040106: refined X-ray transient position
  36. GRB040106, likely optical afterglow
  37. GRB040106: Second Epoch Optical Observations
  38. GRB 031220: Optical observations of Chandra X-ray sources
  39. GRB031220: Palomar Observations
  40. GRB031203, improved XMM position
  41. GRB 031203: Discovery of a dust echo
  42. GRB 021203: A Normal GRB viewed far off axis?
  43. GRB 031203: Variable Radio Source
  44. GRB 031203: Optical/IR Astrometry
  45. GRB031203: K' Photometry of the likely GRB host
  46. GRB 031203: Radio detection
  47. GRB 031203: IR NTTobservations do not confirm REM detection
  48. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  49. IPN detection of activity from SGR1806-20
  50. GRB 031111: Optical observations
  51. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  52. GRB030329: radio observations at RT-22 (CrAO)
  53. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  54. IPN detection of continued activity from SGR1806-20
  55. XRF 030723: Subaru Optical Observations
  56. XRF 030723: Detection of the likely host galaxy
  57. GRB030913: Subaru Optical Observations
  58. GRB030913, candidate afterglow observations
  59. GRB 030913, optical candidate
  60. GRB030913: AAVSO optical observations
  61. GRB030913 (=H2849): Confirmation of the Flight Localization
  62. Magellan Observations of GRB030725 (=H2779)
  63. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  64. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  65. IBAS detection of bursts from SGR 1806-20
  66. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  67. IPN detection of continued activity from SGR1806-20
  68. GRB 021206 Optical Observations
  69. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  70. XRF 030723: Detection of a rebrightening in the optical afterglow
  71. GRB030725: Optical observations
  72. XRF030723, BVRcIc field photometry update
  73. XRF030723: Re-analysis of ROTSE-III early images
  74. GRB 030725: optical observations.
  75. GRB030725, optical transient observations
  76. XRF030723 Radio Observations
  77. XRF030723(=H2777): Chandra Observations
  78. XRF 030723: VLT spectra
  79. GRB030725, possible optical transient
  80. XRF030723: Palomar observations and proposed counterpart
  81. XRF 030723, optical observations
  82. Konus-Wind detection of the bursts from SGR1806-20 region
  83. GRBlog: Compilation of all GCN Circ. data
  84. IPN detection of renewed activity from SGR1806-20
  85. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  86. GRB030329: second XMM-Newton observation
  87. GRB030418: R optical observations
  88. HETE detection of burst from SGR1806-20
  89. GRB 021206, Radio afterglow candidate
  90. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  91. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  92. GRB 030528: Optical Observations
  93. GRB 030528: tentative NIR counterpart
  94. GRB030329, further radio observations at GMRT
  95. GRB 030519B: optical observations.
  96. GRB 030329: optical observations
  97. GRB 030329: Correction to GCN 2254
  98. GRB 030329: Optical Observations
  99. GRB 021004: HST observations
  100. GRB030324: Further Observations of the Candidate Optical Afterglow

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