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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"

21935 results found.

  1. GRB 050904: NIR object inside the XRT error box
  2. GRB 050904: SOAR YJ and PROMPT Ic Observations
  3. GRB050904: Optical Observations
  4. GRB 050904: Environmental Constraints
  5. GRB 050904: Possible High-Redshift GRB
  6. GRB 050904: SOAR/PROMPT Observations
  7. GRB050904: P60 Observations
  8. GRB 050824: MDM Observations
  9. GRB 050827 : OSN 1.5m optical observations
  10. GRB 050827: P200 NIR Observations
  11. GRB 050826 : Lulin R band observation
  12. GRB050820A: RTT150 optical observations
  13. GRB050827: RTT150 optical observations
  14. Subaru Observations of GRB050724
  15. GRB 050826: Optical Candidate
  16. GRB050826: Swift-BAT detection of a long burst
  17. GRB050824: MASTER final analysis of the OT observations
  18. Possible GRB050825:MASTER optical observations
  19. GRB050824: CORRECTION to UVOT observing times
  20. GRB050824: Swift/UVOT detection of fading afterglow
  21. GRB050824, I-band imaging
  22. GRB050824: Radio Observations
  23. GRB 050824 optical candidate
  24. GRB050820A: RTT150 optical observations
  25. GRB050820a: PROMPT RcIc Observations
  26. VLT/UVES spectroscopy of GRB050820
  27. GRB 050820A BAT observations of second, larger episode of emission
  28. GRB050813: Maidanak I-band observations
  29. GRB050820A: RTT150 optical observations
  30. GRB 050822: ROTSE-III Prompt Optical Limits
  31. GRB050820A: Radio Observation
  32. GRB 050820a: NIR Observations by WIRO
  33. GRB 050820B: Swift XRT position
  34. Swift/UVOT photometry of GRB050820
  35. GRB050820: refined XRT analysis
  36. GRB 050820: P60 Temporal Decay Index
  37. GRB 050820: High Resolution Spectroscopy from Keck
  38. GRB050819: refined XRT analysis
  39. GRB050819: RTT150 optical observations
  40. GRB 050820: Swift detection of a GRB
  41. GRB 050817: Optical observations
  42. GRB 050815: Radio Observation
  43. GRB050814: Radio Observation
  44. GRB050817: Negative Optical Observations
  45. GRB050817: Swift-BAT Detection of a burst
  46. GRB050815: Optical afterglow detection by Swift UVOT
  47. GRB 050813: Radio Observations
  48. GRB 050730: Third Epoch WSRT Radio Observations
  49. GRB 050813: Gemini Spectra Revisited
  50. GRB050814: P60 Optical Afterglow Candidate
  51. GRB 050813: Non-fading of afterglow candidate
  52. GRB050813: Gemini Imaging
  53. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  54. GRB 050813: Magellan detection of a high redshift galaxy cluster
  55. GRB050813: RTT150 optical observations
  56. GRB 050813: I-band observations
  57. GRB050813, SDSS pre-burst observations
  58. GRB 050813: Photometry of object in XRT error circle
  59. RBO GRB 050714A and GRB 050716 observations
  60. GRB050813 (Swift 150139): P60 Observations
  61. GRB050803: CrAO optical observations, no OT candidate
  62. GRB 050730: WSRT Radio Observations
  63. GRB 050803: PROMPT BVRcIc Observations
  64. GRB 050807: ROTSE-III Optical Limits
  65. GRB 050730, optical observation
  66. GRB050805a : Null detection report
  67. GRB050730, optical observations
  68. GRB050803, optical observations
  69. Swift-BAT trigger 149118 is very likely not a GRB
  70. GRB050805b: MASTER optical observations
  71. GRB050802: TNG optical observations
  72. GRB050803: Radio Observation
  73. GRB 050803: RTT150 optical observations
  74. GRB050730: Radio Detection
  75. GRB050803: CrAO optical observations, possible OT candidate
  76. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  77. GRB 050803: Keck Observations
  78. GRB 050802.422: Fading of the afterglow and detection of the host
  79. GRB 050803, optical observations
  80. GRB 050803: Magellan Observations
  81. GRB 050803: TAROT optical limits
  82. GRB050803: MASTER optical observations
  83. GRB050802: Tentative absorption redshift
  84. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  85. GRB 050802: Swift/UVOT optical and UV detections
  86. GRB050802: CrAO optical observations
  87. GRB 050730: OHP optical observations
  88. GRB 050802: Swift/UVOT observations
  89. GRB 050802: Swift Gamma-ray Burst
  90. GRB 050730: Preliminary Analysis of MIKE Spectrum
  91. GRB 050801, SMARTS optical/IR afterglow observations
  92. GRB 050801, afterglow observations
  93. GRB 050730, corrected photometry and break?
  94. GRB050801: Swift-BAT detection of a burst
  95. GRB 050801: ROTSE-III Detection of Possible Counterpart
  96. GRB 050730: XRT refined analysis
  97. GRB 050730: early TAROT optical observations
  98. GRB 050726: PROMPT Rc Observations
  99. GRB 050730: RTT150 optical observations
  100. GRB 050730: Swift XRT afterglow observations

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