Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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"

32573 results found.

  1. EP241223a
  2. EP241223a: Global MASTER-Net observations report
  3. EP241113a: Non-detection in Radio Follow-up Observations with eMERLIN
  4. GRB241113A: 7DT Optical upper limits
  5. Fermi GRB 241223A: Global MASTER-Net observations report
  6. GRB 241223A: GOTO optical observations summary
  7. GRB 241105A: JWST photometric observations of the host galaxy
  8. GRB 241223A: Swift ToO observations
  9. EP241217a: e-MERLIN radio observations
  10. GRB 241217A / EP241217b: Non-detection in ATCA Radio Follow-up Observations
  11. GRB 241209B: host galaxy detection and GTC/OSIRIS+ spectroscopy
  12. Fermi GRB 241221A: Global MASTER-Net observations report
  13. GRB 241217A/EP241217b: SOAR afterglow detection
  14. EP241217a: Liverpool Telescope optical upper limit
  15. EP241021a: VLA radio detection
  16. GRB 241218A: Mondy AZT-33IK optical upper limit
  17. EP241217a : Leavitt Observatory optical upper limit
  18. GRB 241217A/EP241217b: tentative VLT spectroscopic redshift z=1.879
  19. EP241217a: 1.6m Mephisto multi-band optical observations
  20. GRB 241217a/EP241217B: 1.6m Mephisto optical upper limits
  21. GRB 241218A: Swift/UVOT Upper Limits
  22. EP241217a: optical upper limit with the Liverpool Telescope
  23. GRB 241209B: EP-FXT afterglow detection
  24. Konus-Wind detection of GRB 241204A (short/hard)
  25. GRB 241218A: NOT optical upper limits
  26. GRB 241218A: Swift-BAT refined analysis
  27. GRB 241217A / EP241217B: GRANDMA/T1MPicduMidi optical upperlimits
  28. EP 241217a: NIR detection with P200/WIRC
  29. EP 241217a: Possible J-band detection with WINTER
  30. GRB 241217A/EP241217B: Fermi-GBM Sub-Threshold Detection
  31. EP241217a: refined EP-WXT analysis and EP-FXT follow-up observations
  32. GRB 241217A / EP241217b: Nanshan/HMT optical upper limit
  33. GRB 241217A: refined SVOM/MXT data analysis. Long lasting X-ray emission.
  34. GRB 241217A / EP241217b: NOT optical upper limits
  35. GRB 241218A: REM optical upper limit
  36. GRB 241217A/EP241217b: REM optical/NIR upper limits
  37. EP241217a: REM optical/NIR upper limits
  38. GRB 241218a: Liverpool Telescope optical follow-up
  39. GRB 241217a: Liverpool Telescope optical follow-up
  40. EP241217a: Liverpool Telescope optical follow-up
  41. EP241217a: NOT optical observations
  42. EP241217a: GROWTH-India Telescope optical observations
  43. GRB 241218A: NUTTelA-TAO / BSTI Optical Limits
  44. EP241119a: 7DT Optical upper limits
  45. EP241217b: Global MASTER-Net observations report
  46. GRB 241209A: ATCA radio follow-up observations
  47. EP241217a: Xinglong optical follow-up observations
  48. EP241217b/GRB 241217A: EP detection of the prompt X-ray emssion
  49. GRB 241218A: LCOGT Optical Upper Limit
  50. EP241217a: Global MASTER-Net observations report
  51. GRB 241217A: GMG Optical Upper Limit
  52. GRB 241217A : SVOM/VT optical afterglow detection
  53. GRB 241217A: LCO optical upper limit
  54. GRB 241217A: GRANDMA/TAROT optical upperlimits
  55. EP241217a: Swift-XRT Detection
  56. EP241217A: Non-detection from Fermi-GBM Observations
  57. EP241217a: Gemini-North spectroscopic redshift z = 4.59
  58. EP241217a: Kinder optical follow-up observations
  59. GRB 241214A: GRBAlpha detection
  60. GRB 241213A (EP241213a): GRBAlpha detection
  61. GRB 241209D: GRBAlpha detection
  62. EP241217A: LCO optical observations
  63. EP241217a: Gemini-North detection of the likely optical counterpart
  64. EP241107a: VLA Radio Observation
  65. GRB 241213A: Swift-BAT refined analysis
  66. GRB 241214A: Swift/BAT-GUANO localization skymap of a burst
  67. Konus-Wind detection of GRB 241213A (EP 241213a)
  68. GRB 241215A: Mondy AZT-33IK optical observations
  69. GRB 241215A: Nanshan/HMT optical upper limit
  70. GRB 241215A: Montarrenti Observatory optical upper limit
  71. GRB 241215A: GROWTH-India telescope optical upper limit
  72. GRB 241209D: CALET Gamma-Ray Burst Monitor detection
  73. GRB 241209B: SVOM/VT optical continuous fading
  74. GRB 241213A: SVOM/VT optical candidate
  75. GRB 241213B: Tiled Swift observations
  76. GRB 241213A: Swift/UVOT Upper Limits
  77. GRB 241213B: CALET Gamma-Ray Burst Monitor detection
  78. GRB 241212A: Fermi GBM detection
  79. EP241208a: NOT optical upper limits
  80. GRB 241212A: Swift ToO observations
  81. GRB 241213A: LCOGT Optical Upper Limits
  82. EP 241208A : Detection of a long soft transient by SVOM/ECLAIRs
  83. EP241213a/GRB241213a: Likely joint detection and INTEGRAL/SPI-ACS counterpart
  84. GRB 241213A: REM optical/NIR upper limits
  85. GRB241212A: OHP/T193 optical observations
  86. GRB 241213A: SAO RAS optical upper limit
  87. LIGO/Virgo/KAGRA S241210fu: Updated Sky localization
  88. Swift GRB 241213A: Global MASTER-Net observations report
  89. GRB 241212A : SVOM/C-GFT optical upper limit at early phase
  90. GRB 241212A : SVOM/VT bright optical afterglow
  91. GRB 241212A: AstroSat CZTI detection
  92. GRB 241209B: GRANDMA/TRT upper limit
  93. GRB 241207A: TSHAO Zeiss-1000 optical observations
  94. GRB 241212A: SVOM detection of a bright long burst
  95. GRB 241209B: Mondy AZT-33IK and AbAO AS-32 optical observations
  96. GRB 241209A: Chandra X-ray Detection
  97. Konus-Wind detection of GRB 241209B
  98. GRB 241207A: EIRSAT-1 GMOD Detection
  99. GRB 241209A: Redshift of the likely host galaxy z = 0.784 from OSIRIS+/GTC
  100. GRB 241209B: GRBAlpha detection

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov