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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"

16203 results found.

  1. GRB 040606: Optical observations
  2. MASTER: HETE Alert 3274 optical observation
  3. GRB 040511: NIR observations with REM
  4. GRB 040511: Optical limit
  5. GRB040511: Candidate optical/NIR afterglow
  6. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  7. GRB 040511: Second Epoch Optical Observations
  8. GRB 040511: Optical observations
  9. GRB 040511: Optical Observations
  10. GRB040511: Optical Observations
  11. GRB040511: Optical Observations
  12. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  13. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  14. On Line Availability of Archival HETE Fregate Data and Lightcurves
  15. GRB040422: optical observations at Xinglong Observatory
  16. GRB040422: optical observations at CrAO
  17. GRB 040423 (=H3175): A Long GRB Localized by HETE
  18. GRB040422, optical observations at Loiano
  19. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  20. GRB 040422,optical observation
  21. GRB040422: optical and NIR observations at the VLT
  22. GRB 040403, deep optical observations
  23. MASTER: HETE Alert 3163, 3167 technical optical observation
  24. GRB 040403: Optical Observations
  25. GRB 040403 Optical Observations
  26. GRB 040403: Optical observations
  27. GRB 040403: optical observations
  28. GRB 040403: Optical Observations
  29. GRB040323: NIR Observations and Variable Object
  30. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  31. GRB 040323, a dark GRB ?
  32. GRB040223, improved XMM position
  33. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  34. MASTER: RXTE GRB040308 optical observation
  35. RXTE GRB040229 optical observation: no candidate
  36. GRB 040228 Optical observations
  37. GRB040228 : KISO optical follow-up observation
  38. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  39. GRB 040223 : Optical observation (non-detection)
  40. GRB031111, optical observations
  41. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  42. GRB040106: refined X-ray transient position
  43. SN 2003dh/GRB030329 late-time optical spectroscopy
  44. GRB040106, Radio Observations
  45. GRB040106, likely optical afterglow
  46. GRB040106: Second Epoch Optical Observations
  47. GRB 031220: Optical observations of Chandra X-ray sources
  48. GRB040106: optical observations with REM+ROSS
  49. GRB 040106: Optical observations
  50. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  51. GRB 031220 : Kyoto Optical Observation
  52. GRB 031220: Optical observation at Tokyo Tech
  53. GRB031220: ROTSE-IIIb Optical Limits
  54. GRB031220 : Optical Observation of Lulin Observatory
  55. GRB 031203 I-band monitoring
  56. GRB 031203: Discovery of a dust echo
  57. GRB 031203: SMARTS optical monitoring
  58. GRB 031203: Optical/IR Astrometry
  59. IPN/HETE localization of GRB031203B (=H2949; large error box)
  60. GRB031203 : Optical Observation of Lulin Observatory
  61. GRB031203: Optical Observations
  62. GRB 031203: Optical/IR SMARTS Observations
  63. GRB031111A, prompt optical observations
  64. GRB 031111B (= H2925) : Kyoto Optical Observation
  65. GRB 031111: Optical observations
  66. GRB 031111, optical observations
  67. SN 2003jd (SN/GRB?) -- X-ray Observations
  68. XRF031109 (=H2919): A very long XRF localized by HETE
  69. Lulin optical follow-up observations of GRB031026
  70. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  71. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  72. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  73. GRB031026 : KISO optical follow-up observation
  74. IPN detection of continued activity from SGR1806-20
  75. XRF 030723: Subaru Optical Observations
  76. XRF 030723: Detection of the likely host galaxy
  77. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  78. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  79. GRB030913: Subaru Optical Observations
  80. GRB 030913: ROTSE-3c Optical Observations
  81. GRB030913, candidate afterglow observations
  82. GRB 030913, optical candidate
  83. GRB030913: AAVSO optical observations
  84. GRB030913 (=H2849): Confirmation of the Flight Localization
  85. Magellan Observations of GRB030725 (=H2779)
  86. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  87. GRB 030913: Optical limit at RIKEN
  88. XRF030824: Optical observations
  89. IBAS detection of bursts from SGR 1806-20
  90. XRF030824: Second-epoch Palomar observations
  91. XRF030824: optical observations
  92. GRB030823: optical observations
  93. GRB030823: Palomar observations
  94. GRB030823: optical observation at Tokyo Tech
  95. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  96. IPN detection of continued activity from SGR1806-20
  97. GRB 030817 = H2808 TAROT optical observations
  98. SGR 1808-20 (=H2802): A Possible new SGR
  99. GRB 021206 Optical Observations
  100. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed

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