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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"

37759 results found.

  1. GRB 070125: Xinglong TNT optical observations
  2. GRB 070125: Continued P60 Observations
  3. GRB 070125: pseudo-z~1.5 from spectral parameters of the prompt emission
  4. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  5. GRB 070125: Lick 3m Spectroscopy
  6. GRB070125: Swift-XRT Refined Analysis
  7. GRB 070125: SARA detection in R
  8. GRB 070125: P60 Optical Afterglow Candidate
  9. GRB 070126?: Swift detection of a possible burst
  10. GRB070125 redshift request
  11. RHESSI Spectrum of GRB070125
  12. IPN-BAT localization of GRB070125 (very long duration, intense)
  13. Konus-Wind observation of short hard GRB 070124
  14. IPN localization of GRB070124 (short duration, hard spectrum)
  15. GRB 070110: optical break
  16. GRB 070110: Continued Detection and Request for Ground Followup
  17. GRB 050904: Second Epoch of HST/NICMOS Observations
  18. GRB 070110: Ep,i - Eiso correlation
  19. GRB 070107: Suzaku WAM observation of the prompt emission
  20. GRB 070110: VLT R-band photometry
  21. GRB 070110 declared a "Burst of Interest" by Swift team
  22. Further Retractions of previous Swift-BAT triggers
  23. Swift-BAT Trigger 255685 is not a GRB
  24. Trigger 255685: Swift detection of a possible burst
  25. GRB 070110: VLT absorption redshift
  26. GRB 070110: UVOT Observations of a Candidate Afterglow
  27. GRB 070110, Swift-BAT refined analysis
  28. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  29. GRB 070110: Swift detection of a burst with a possible optical afterglow
  30. IBAS Alert n. 4047: Not a GRB
  31. GRB070107: Swift/XRT refined analysis
  32. GRB 070107: Possible UVOT Afterglow
  33. GRB 070107, Swift-BAT refined analysis
  34. GRB 070107: Swift/XRT position
  35. GRB 070107: Swift detection of a burst
  36. VLA observation of GRB 061222B
  37. VLA detection of GRB 061222A
  38. GRB 061201: Nearby Galaxy Cluster Abell 995 is at z=0.0865
  39. GRB070103: KPNO 4m+FLAMINGOS J limit
  40. GRB 070103: Swift/UVOT Upper limits
  41. GRB 070103, Swift-BAT refined analysis
  42. GRB 070103: NOT observations
  43. GRB 070103: TAROT Calern observatory optical observations
  44. GRB 070103: Swift detection of a burst
  45. Retractions of previous Swift-BAT triggers
  46. GRB061222a: optical observations
  47. erratum : SDSS Pre-burst Observations of GRB061126
  48. Konus-Wind observation of GRB 061222A
  49. GRB 061210: Swift/XRT Astrometry Correction
  50. GRB 050826: MDM Redshift
  51. GRB 061222B: TAROT La Silla observatory early optical observations
  52. GRB 061218: TAROT La Silla observatory early optical observations
  53. GRB 061222A: MITSuME Akeno optical upper limits
  54. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  55. GRB 061222B: MITSuME Akeno optical upper limits
  56. GRB 061222A: Xinglong Optical Limit
  57. GRB 061222A: Gemini Afterglow Candidate
  58. GRB 061222B, Swift-BAT refined analysis
  59. GRB061222A Swift/UVOT: Upper Limits
  60. GRB 061222B: Swift/UVOT Upper limits
  61. GRB 061222B: Observation with the KANATA 1.5m telescope
  62. GRB061222B: Swift-XRT Refined Analysis
  63. GRB 061222A: Observation with the KANATA 1.5m telescope
  64. GRB 061222B: BOOTES-IR optical observations
  65. GRB 061222B: SARA upper limit
  66. GRB 061222A: Swift-XRT refined analysis
  67. GRB 061217: Magellan host galaxy redshift
  68. GRB 061222A, Swift-BAT refined analysis
  69. GRB 061222B: REM NIR/optical observations
  70. GRB 061222b: Refined redshift
  71. GRB 061222b, SMARTS optical/IR afterglow observations
  72. GRB 061222B: TAROT La Silla observatory afterglow observation
  73. GRB 061222B: TAROT La Silla observatory optical observations
  74. GRB 061222b: Magellan redshift
  75. GRB 061222B: Swift detection of a burst
  76. GRB 061222b: optical afterglow
  77. GRB 061222A: Prompt ROTSE-III Optical Limits
  78. GRB 061222: Swift detection of a burst
  79. GRB 061217: Astrometry-Corrected XRT Position
  80. GRB 061201: Magellan redshift of nearby galaxy
  81. GRB 061217: Confirmation of host candidate
  82. GRB 061217: Object ib GCN 5948 is a star
  83. GRB 061217: Extended object in the revised XRT error circle
  84. GRB 061217, Candidate host galaxy
  85. GRB 061217 - Swift/XRT position correction
  86. GRB 061210: Possible Host Galaxy (S2-G2) Keck Spectrum
  87. GRB 061201: Correction to GCN 5944
  88. GRB 061201: Magellan Redshift of nearby Abell cluster
  89. GRB 061218: TAROT La Silla observatory optical observations
  90. GRB 061217: TAROT Calern observatory optical observations
  91. GRB 061218: TORTOREM optical upper limits
  92. GRB 061218, Swift-BAT refined analysis
  93. GRB 061218, SMARTS optical/IR observations
  94. GRB 061218: REM prompt observations
  95. GRB 061217, SMARTS optical observations
  96. GRB061217: Swift/UVOT refined analysis.
  97. GRB 061217: optical observations at Calar Alto
  98. GRB061217 - Swift/XRT refined analysis
  99. GRB 061217, Further Swift-BAT refined analysis of the short hard burst
  100. GRB 061217, Swift-BAT refined analysis

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